diff options
Diffstat (limited to 'src/fe_utils')
| -rw-r--r-- | src/fe_utils/.gitignore | 1 | ||||
| -rw-r--r-- | src/fe_utils/Makefile | 61 | ||||
| -rw-r--r-- | src/fe_utils/archive.c | 124 | ||||
| -rw-r--r-- | src/fe_utils/cancel.c | 234 | ||||
| -rw-r--r-- | src/fe_utils/conditional.c | 177 | ||||
| -rw-r--r-- | src/fe_utils/mbprint.c | 405 | ||||
| -rw-r--r-- | src/fe_utils/print.c | 3663 | ||||
| -rw-r--r-- | src/fe_utils/psqlscan.c | 4996 | ||||
| -rw-r--r-- | src/fe_utils/psqlscan.l | 1478 | ||||
| -rw-r--r-- | src/fe_utils/recovery_gen.c | 175 | ||||
| -rw-r--r-- | src/fe_utils/simple_list.c | 175 | ||||
| -rw-r--r-- | src/fe_utils/string_utils.c | 1029 |
12 files changed, 12518 insertions, 0 deletions
diff --git a/src/fe_utils/.gitignore b/src/fe_utils/.gitignore new file mode 100644 index 0000000..37f5f75 --- /dev/null +++ b/src/fe_utils/.gitignore @@ -0,0 +1 @@ +/psqlscan.c diff --git a/src/fe_utils/Makefile b/src/fe_utils/Makefile new file mode 100644 index 0000000..dd20663 --- /dev/null +++ b/src/fe_utils/Makefile @@ -0,0 +1,61 @@ +#------------------------------------------------------------------------- +# +# Makefile for src/fe_utils +# +# This makefile generates a static library, libpgfeutils.a, +# for use by client applications +# +# Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group +# Portions Copyright (c) 1994, Regents of the University of California +# +# IDENTIFICATION +# src/fe_utils/Makefile +# +#------------------------------------------------------------------------- + +subdir = src/fe_utils +top_builddir = ../.. +include $(top_builddir)/src/Makefile.global + +override CPPFLAGS := -DFRONTEND -I$(libpq_srcdir) $(CPPFLAGS) + +OBJS = \ + archive.o \ + cancel.o \ + conditional.o \ + mbprint.o \ + print.o \ + psqlscan.o \ + recovery_gen.o \ + simple_list.o \ + string_utils.o + +all: libpgfeutils.a + +libpgfeutils.a: $(OBJS) + rm -f $@ + $(AR) $(AROPT) $@ $^ + +psqlscan.c: FLEXFLAGS = -Cfe -p -p +psqlscan.c: FLEX_NO_BACKUP=yes +psqlscan.c: FLEX_FIX_WARNING=yes + +distprep: psqlscan.c + +# libpgfeutils could be useful to contrib, so install it +install: all installdirs + $(INSTALL_STLIB) libpgfeutils.a '$(DESTDIR)$(libdir)/libpgfeutils.a' + +installdirs: + $(MKDIR_P) '$(DESTDIR)$(libdir)' + +uninstall: + rm -f '$(DESTDIR)$(libdir)/libpgfeutils.a' + +clean distclean: + rm -f libpgfeutils.a $(OBJS) lex.backup + +# psqlscan.c is supposed to be in the distribution tarball, +# so do not clean it in the clean/distclean rules +maintainer-clean: distclean + rm -f psqlscan.c diff --git a/src/fe_utils/archive.c b/src/fe_utils/archive.c new file mode 100644 index 0000000..1e9d994 --- /dev/null +++ b/src/fe_utils/archive.c @@ -0,0 +1,124 @@ +/*------------------------------------------------------------------------- + * + * archive.c + * Routines to access WAL archives from frontend + * + * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * + * IDENTIFICATION + * src/fe_utils/archive.c + * + *------------------------------------------------------------------------- + */ + +#include "postgres_fe.h" + +#include <unistd.h> +#include <sys/stat.h> + +#include "access/xlog_internal.h" +#include "common/archive.h" +#include "common/logging.h" +#include "fe_utils/archive.h" + + +/* + * RestoreArchivedFile + * + * Attempt to retrieve the specified file from off-line archival storage. + * If successful, return a file descriptor of the restored file, else + * return -1. + * + * For fixed-size files, the caller may pass the expected size as an + * additional crosscheck on successful recovery. If the file size is not + * known, set expectedSize = 0. + */ +int +RestoreArchivedFile(const char *path, const char *xlogfname, + off_t expectedSize, const char *restoreCommand) +{ + char xlogpath[MAXPGPATH]; + char *xlogRestoreCmd; + int rc; + struct stat stat_buf; + + snprintf(xlogpath, MAXPGPATH, "%s/" XLOGDIR "/%s", path, xlogfname); + + xlogRestoreCmd = BuildRestoreCommand(restoreCommand, xlogpath, + xlogfname, NULL); + if (xlogRestoreCmd == NULL) + { + pg_log_fatal("cannot use restore_command with %%r placeholder"); + exit(1); + } + + /* + * Execute restore_command, which should copy the missing file from + * archival storage. + */ + rc = system(xlogRestoreCmd); + pfree(xlogRestoreCmd); + + if (rc == 0) + { + /* + * Command apparently succeeded, but let's make sure the file is + * really there now and has the correct size. + */ + if (stat(xlogpath, &stat_buf) == 0) + { + if (expectedSize > 0 && stat_buf.st_size != expectedSize) + { + pg_log_fatal("unexpected file size for \"%s\": %lu instead of %lu", + xlogfname, (unsigned long) stat_buf.st_size, + (unsigned long) expectedSize); + exit(1); + } + else + { + int xlogfd = open(xlogpath, O_RDONLY | PG_BINARY, 0); + + if (xlogfd < 0) + { + pg_log_fatal("could not open file \"%s\" restored from archive: %m", + xlogpath); + exit(1); + } + else + return xlogfd; + } + } + else + { + if (errno != ENOENT) + { + pg_log_fatal("could not stat file \"%s\": %m", + xlogpath); + exit(1); + } + } + } + + /* + * If the failure was due to a signal, then it would be misleading to + * return with a failure at restoring the file. So just bail out and + * exit. Hard shell errors such as "command not found" are treated as + * fatal too. + */ + if (wait_result_is_any_signal(rc, true)) + { + pg_log_fatal("restore_command failed: %s", + wait_result_to_str(rc)); + exit(1); + } + + /* + * The file is not available, so just let the caller decide what to do + * next. + */ + pg_log_error("could not restore file \"%s\" from archive", + xlogfname); + return -1; +} diff --git a/src/fe_utils/cancel.c b/src/fe_utils/cancel.c new file mode 100644 index 0000000..0a38564 --- /dev/null +++ b/src/fe_utils/cancel.c @@ -0,0 +1,234 @@ +/*------------------------------------------------------------------------ + * + * Query cancellation support for frontend code + * + * Assorted utility functions to control query cancellation with signal + * handler for SIGINT. + * + * + * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * src/fe-utils/cancel.c + * + *------------------------------------------------------------------------ + */ + +#include "postgres_fe.h" + +#include <unistd.h> + +#include "common/connect.h" +#include "fe_utils/cancel.h" +#include "fe_utils/string_utils.h" + + +/* + * Write a simple string to stderr --- must be safe in a signal handler. + * We ignore the write() result since there's not much we could do about it. + * Certain compilers make that harder than it ought to be. + */ +#define write_stderr(str) \ + do { \ + const char *str_ = (str); \ + int rc_; \ + rc_ = write(fileno(stderr), str_, strlen(str_)); \ + (void) rc_; \ + } while (0) + +/* + * Contains all the information needed to cancel a query issued from + * a database connection to the backend. + */ +static PGcancel *volatile cancelConn = NULL; + +/* + * CancelRequested is set when we receive SIGINT (or local equivalent). + * There is no provision in this module for resetting it; but applications + * might choose to clear it after successfully recovering from a cancel. + * Note that there is no guarantee that we successfully sent a Cancel request, + * or that the request will have any effect if we did send it. + */ +volatile sig_atomic_t CancelRequested = false; + +#ifdef WIN32 +static CRITICAL_SECTION cancelConnLock; +#endif + +/* + * Additional callback for cancellations. + */ +static void (*cancel_callback) (void) = NULL; + + +/* + * SetCancelConn + * + * Set cancelConn to point to the current database connection. + */ +void +SetCancelConn(PGconn *conn) +{ + PGcancel *oldCancelConn; + +#ifdef WIN32 + EnterCriticalSection(&cancelConnLock); +#endif + + /* Free the old one if we have one */ + oldCancelConn = cancelConn; + + /* be sure handle_sigint doesn't use pointer while freeing */ + cancelConn = NULL; + + if (oldCancelConn != NULL) + PQfreeCancel(oldCancelConn); + + cancelConn = PQgetCancel(conn); + +#ifdef WIN32 + LeaveCriticalSection(&cancelConnLock); +#endif +} + +/* + * ResetCancelConn + * + * Free the current cancel connection, if any, and set to NULL. + */ +void +ResetCancelConn(void) +{ + PGcancel *oldCancelConn; + +#ifdef WIN32 + EnterCriticalSection(&cancelConnLock); +#endif + + oldCancelConn = cancelConn; + + /* be sure handle_sigint doesn't use pointer while freeing */ + cancelConn = NULL; + + if (oldCancelConn != NULL) + PQfreeCancel(oldCancelConn); + +#ifdef WIN32 + LeaveCriticalSection(&cancelConnLock); +#endif +} + + +/* + * Code to support query cancellation + * + * Note that sending the cancel directly from the signal handler is safe + * because PQcancel() is written to make it so. We use write() to report + * to stderr because it's better to use simple facilities in a signal + * handler. + * + * On Windows, the signal canceling happens on a separate thread, because + * that's how SetConsoleCtrlHandler works. The PQcancel function is safe + * for this (unlike PQrequestCancel). However, a CRITICAL_SECTION is required + * to protect the PGcancel structure against being changed while the signal + * thread is using it. + */ + +#ifndef WIN32 + +/* + * handle_sigint + * + * Handle interrupt signals by canceling the current command, if cancelConn + * is set. + */ +static void +handle_sigint(SIGNAL_ARGS) +{ + int save_errno = errno; + char errbuf[256]; + + CancelRequested = true; + + if (cancel_callback != NULL) + cancel_callback(); + + /* Send QueryCancel if we are processing a database query */ + if (cancelConn != NULL) + { + if (PQcancel(cancelConn, errbuf, sizeof(errbuf))) + { + write_stderr(_("Cancel request sent\n")); + } + else + { + write_stderr(_("Could not send cancel request: ")); + write_stderr(errbuf); + } + } + + errno = save_errno; /* just in case the write changed it */ +} + +/* + * setup_cancel_handler + * + * Register query cancellation callback for SIGINT. + */ +void +setup_cancel_handler(void (*callback) (void)) +{ + cancel_callback = callback; + pqsignal(SIGINT, handle_sigint); +} + +#else /* WIN32 */ + +static BOOL WINAPI +consoleHandler(DWORD dwCtrlType) +{ + char errbuf[256]; + + if (dwCtrlType == CTRL_C_EVENT || + dwCtrlType == CTRL_BREAK_EVENT) + { + CancelRequested = true; + + if (cancel_callback != NULL) + cancel_callback(); + + /* Send QueryCancel if we are processing a database query */ + EnterCriticalSection(&cancelConnLock); + if (cancelConn != NULL) + { + if (PQcancel(cancelConn, errbuf, sizeof(errbuf))) + { + write_stderr(_("Cancel request sent\n")); + } + else + { + write_stderr(_("Could not send cancel request: ")); + write_stderr(errbuf); + } + } + + LeaveCriticalSection(&cancelConnLock); + + return TRUE; + } + else + /* Return FALSE for any signals not being handled */ + return FALSE; +} + +void +setup_cancel_handler(void (*callback) (void)) +{ + cancel_callback = callback; + + InitializeCriticalSection(&cancelConnLock); + + SetConsoleCtrlHandler(consoleHandler, TRUE); +} + +#endif /* WIN32 */ diff --git a/src/fe_utils/conditional.c b/src/fe_utils/conditional.c new file mode 100644 index 0000000..4df72d4 --- /dev/null +++ b/src/fe_utils/conditional.c @@ -0,0 +1,177 @@ +/*------------------------------------------------------------------------- + * A stack of automaton states to handle nested conditionals. + * + * Copyright (c) 2000-2020, PostgreSQL Global Development Group + * + * src/fe_utils/conditional.c + * + *------------------------------------------------------------------------- + */ +#include "postgres_fe.h" + +#include "fe_utils/conditional.h" + +/* + * create stack + */ +ConditionalStack +conditional_stack_create(void) +{ + ConditionalStack cstack = pg_malloc(sizeof(ConditionalStackData)); + + cstack->head = NULL; + return cstack; +} + +/* + * destroy stack + */ +void +conditional_stack_destroy(ConditionalStack cstack) +{ + while (conditional_stack_pop(cstack)) + continue; + free(cstack); +} + +/* + * Create a new conditional branch. + */ +void +conditional_stack_push(ConditionalStack cstack, ifState new_state) +{ + IfStackElem *p = (IfStackElem *) pg_malloc(sizeof(IfStackElem)); + + p->if_state = new_state; + p->query_len = -1; + p->paren_depth = -1; + p->next = cstack->head; + cstack->head = p; +} + +/* + * Destroy the topmost conditional branch. + * Returns false if there was no branch to end. + */ +bool +conditional_stack_pop(ConditionalStack cstack) +{ + IfStackElem *p = cstack->head; + + if (!p) + return false; + cstack->head = cstack->head->next; + free(p); + return true; +} + +/* + * Returns current stack depth, for debugging purposes. + */ +int +conditional_stack_depth(ConditionalStack cstack) +{ + if (cstack == NULL) + return -1; + else + { + IfStackElem *p = cstack->head; + int depth = 0; + + while (p != NULL) + { + depth++; + p = p->next; + } + return depth; + } +} + +/* + * Fetch the current state of the top of the stack. + */ +ifState +conditional_stack_peek(ConditionalStack cstack) +{ + if (conditional_stack_empty(cstack)) + return IFSTATE_NONE; + return cstack->head->if_state; +} + +/* + * Change the state of the topmost branch. + * Returns false if there was no branch state to set. + */ +bool +conditional_stack_poke(ConditionalStack cstack, ifState new_state) +{ + if (conditional_stack_empty(cstack)) + return false; + cstack->head->if_state = new_state; + return true; +} + +/* + * True if there are no active \if-blocks. + */ +bool +conditional_stack_empty(ConditionalStack cstack) +{ + return cstack->head == NULL; +} + +/* + * True if we should execute commands normally; that is, the current + * conditional branch is active, or there is no open \if block. + */ +bool +conditional_active(ConditionalStack cstack) +{ + ifState s = conditional_stack_peek(cstack); + + return s == IFSTATE_NONE || s == IFSTATE_TRUE || s == IFSTATE_ELSE_TRUE; +} + +/* + * Save current query buffer length in topmost stack entry. + */ +void +conditional_stack_set_query_len(ConditionalStack cstack, int len) +{ + Assert(!conditional_stack_empty(cstack)); + cstack->head->query_len = len; +} + +/* + * Fetch last-recorded query buffer length from topmost stack entry. + * Will return -1 if no stack or it was never saved. + */ +int +conditional_stack_get_query_len(ConditionalStack cstack) +{ + if (conditional_stack_empty(cstack)) + return -1; + return cstack->head->query_len; +} + +/* + * Save current parenthesis nesting depth in topmost stack entry. + */ +void +conditional_stack_set_paren_depth(ConditionalStack cstack, int depth) +{ + Assert(!conditional_stack_empty(cstack)); + cstack->head->paren_depth = depth; +} + +/* + * Fetch last-recorded parenthesis nesting depth from topmost stack entry. + * Will return -1 if no stack or it was never saved. + */ +int +conditional_stack_get_paren_depth(ConditionalStack cstack) +{ + if (conditional_stack_empty(cstack)) + return -1; + return cstack->head->paren_depth; +} diff --git a/src/fe_utils/mbprint.c b/src/fe_utils/mbprint.c new file mode 100644 index 0000000..5f79cbf --- /dev/null +++ b/src/fe_utils/mbprint.c @@ -0,0 +1,405 @@ +/*------------------------------------------------------------------------- + * + * Multibyte character printing support for frontend code + * + * + * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * src/fe_utils/mbprint.c + * + *------------------------------------------------------------------------- + */ +#include "postgres_fe.h" + +#include "fe_utils/mbprint.h" + +#include "libpq-fe.h" + + +/* + * To avoid version-skew problems, this file must not use declarations + * from pg_wchar.h: the encoding IDs we are dealing with are determined + * by the libpq.so we are linked with, and that might not match the + * numbers we see at compile time. (If this file were inside libpq, + * the problem would go away...) + * + * Hence, we have our own definition of pg_wchar, and we get the values + * of any needed encoding IDs on-the-fly. + */ + +typedef unsigned int pg_wchar; + +static int +pg_get_utf8_id(void) +{ + static int utf8_id = -1; + + if (utf8_id < 0) + utf8_id = pg_char_to_encoding("utf8"); + return utf8_id; +} + +#define PG_UTF8 pg_get_utf8_id() + + +/* + * Convert a UTF-8 character to a Unicode code point. + * This is a one-character version of pg_utf2wchar_with_len. + * + * No error checks here, c must point to a long-enough string. + */ +static pg_wchar +utf8_to_unicode(const unsigned char *c) +{ + if ((*c & 0x80) == 0) + return (pg_wchar) c[0]; + else if ((*c & 0xe0) == 0xc0) + return (pg_wchar) (((c[0] & 0x1f) << 6) | + (c[1] & 0x3f)); + else if ((*c & 0xf0) == 0xe0) + return (pg_wchar) (((c[0] & 0x0f) << 12) | + ((c[1] & 0x3f) << 6) | + (c[2] & 0x3f)); + else if ((*c & 0xf8) == 0xf0) + return (pg_wchar) (((c[0] & 0x07) << 18) | + ((c[1] & 0x3f) << 12) | + ((c[2] & 0x3f) << 6) | + (c[3] & 0x3f)); + else + /* that is an invalid code on purpose */ + return 0xffffffff; +} + + +/* + * Unicode 3.1 compliant validation : for each category, it checks the + * combination of each byte to make sure it maps to a valid range. It also + * returns -1 for the following UCS values: ucs > 0x10ffff ucs & 0xfffe = + * 0xfffe 0xfdd0 < ucs < 0xfdef ucs & 0xdb00 = 0xd800 (surrogates) + */ +static int +utf_charcheck(const unsigned char *c) +{ + if ((*c & 0x80) == 0) + return 1; + else if ((*c & 0xe0) == 0xc0) + { + /* two-byte char */ + if (((c[1] & 0xc0) == 0x80) && ((c[0] & 0x1f) > 0x01)) + return 2; + return -1; + } + else if ((*c & 0xf0) == 0xe0) + { + /* three-byte char */ + if (((c[1] & 0xc0) == 0x80) && + (((c[0] & 0x0f) != 0x00) || ((c[1] & 0x20) == 0x20)) && + ((c[2] & 0xc0) == 0x80)) + { + int z = c[0] & 0x0f; + int yx = ((c[1] & 0x3f) << 6) | (c[0] & 0x3f); + int lx = yx & 0x7f; + + /* check 0xfffe/0xffff, 0xfdd0..0xfedf range, surrogates */ + if (((z == 0x0f) && + (((yx & 0xffe) == 0xffe) || + (((yx & 0xf80) == 0xd80) && (lx >= 0x30) && (lx <= 0x4f)))) || + ((z == 0x0d) && ((yx & 0xb00) == 0x800))) + return -1; + return 3; + } + return -1; + } + else if ((*c & 0xf8) == 0xf0) + { + int u = ((c[0] & 0x07) << 2) | ((c[1] & 0x30) >> 4); + + /* four-byte char */ + if (((c[1] & 0xc0) == 0x80) && + (u > 0x00) && (u <= 0x10) && + ((c[2] & 0xc0) == 0x80) && ((c[3] & 0xc0) == 0x80)) + { + /* test for 0xzzzzfffe/0xzzzzfffff */ + if (((c[1] & 0x0f) == 0x0f) && ((c[2] & 0x3f) == 0x3f) && + ((c[3] & 0x3e) == 0x3e)) + return -1; + return 4; + } + return -1; + } + return -1; +} + + +static void +mb_utf_validate(unsigned char *pwcs) +{ + unsigned char *p = pwcs; + + while (*pwcs) + { + int len; + + if ((len = utf_charcheck(pwcs)) > 0) + { + if (p != pwcs) + { + int i; + + for (i = 0; i < len; i++) + *p++ = *pwcs++; + } + else + { + pwcs += len; + p += len; + } + } + else + /* we skip the char */ + pwcs++; + } + if (p != pwcs) + *p = '\0'; +} + +/* + * public functions : wcswidth and mbvalidate + */ + +/* + * pg_wcswidth is the dumb display-width function. + * It assumes that everything will appear on one line. + * OTOH it is easier to use than pg_wcssize if this applies to you. + */ +int +pg_wcswidth(const char *pwcs, size_t len, int encoding) +{ + int width = 0; + + while (len > 0) + { + int chlen, + chwidth; + + chlen = PQmblen(pwcs, encoding); + if (len < (size_t) chlen) + break; /* Invalid string */ + + chwidth = PQdsplen(pwcs, encoding); + if (chwidth > 0) + width += chwidth; + + pwcs += chlen; + len -= chlen; + } + return width; +} + +/* + * pg_wcssize takes the given string in the given encoding and returns three + * values: + * result_width: Width in display characters of the longest line in string + * result_height: Number of lines in display output + * result_format_size: Number of bytes required to store formatted + * representation of string + * + * This MUST be kept in sync with pg_wcsformat! + */ +void +pg_wcssize(const unsigned char *pwcs, size_t len, int encoding, + int *result_width, int *result_height, int *result_format_size) +{ + int w, + chlen = 0, + linewidth = 0; + int width = 0; + int height = 1; + int format_size = 0; + + for (; *pwcs && len > 0; pwcs += chlen) + { + chlen = PQmblen((const char *) pwcs, encoding); + if (len < (size_t) chlen) + break; + w = PQdsplen((const char *) pwcs, encoding); + + if (chlen == 1) /* single-byte char */ + { + if (*pwcs == '\n') /* Newline */ + { + if (linewidth > width) + width = linewidth; + linewidth = 0; + height += 1; + format_size += 1; /* For NUL char */ + } + else if (*pwcs == '\r') /* Linefeed */ + { + linewidth += 2; + format_size += 2; + } + else if (*pwcs == '\t') /* Tab */ + { + do + { + linewidth++; + format_size++; + } while (linewidth % 8 != 0); + } + else if (w < 0) /* Other control char */ + { + linewidth += 4; + format_size += 4; + } + else /* Output it as-is */ + { + linewidth += w; + format_size += 1; + } + } + else if (w < 0) /* Non-ascii control char */ + { + linewidth += 6; /* \u0000 */ + format_size += 6; + } + else /* All other chars */ + { + linewidth += w; + format_size += chlen; + } + len -= chlen; + } + if (linewidth > width) + width = linewidth; + format_size += 1; /* For NUL char */ + + /* Set results */ + if (result_width) + *result_width = width; + if (result_height) + *result_height = height; + if (result_format_size) + *result_format_size = format_size; +} + +/* + * Format a string into one or more "struct lineptr" lines. + * lines[i].ptr == NULL indicates the end of the array. + * + * This MUST be kept in sync with pg_wcssize! + */ +void +pg_wcsformat(const unsigned char *pwcs, size_t len, int encoding, + struct lineptr *lines, int count) +{ + int w, + chlen = 0; + int linewidth = 0; + unsigned char *ptr = lines->ptr; /* Pointer to data area */ + + for (; *pwcs && len > 0; pwcs += chlen) + { + chlen = PQmblen((const char *) pwcs, encoding); + if (len < (size_t) chlen) + break; + w = PQdsplen((const char *) pwcs, encoding); + + if (chlen == 1) /* single-byte char */ + { + if (*pwcs == '\n') /* Newline */ + { + *ptr++ = '\0'; + lines->width = linewidth; + linewidth = 0; + lines++; + count--; + if (count <= 0) + exit(1); /* Screwup */ + + /* make next line point to remaining memory */ + lines->ptr = ptr; + } + else if (*pwcs == '\r') /* Linefeed */ + { + strcpy((char *) ptr, "\\r"); + linewidth += 2; + ptr += 2; + } + else if (*pwcs == '\t') /* Tab */ + { + do + { + *ptr++ = ' '; + linewidth++; + } while (linewidth % 8 != 0); + } + else if (w < 0) /* Other control char */ + { + sprintf((char *) ptr, "\\x%02X", *pwcs); + linewidth += 4; + ptr += 4; + } + else /* Output it as-is */ + { + linewidth += w; + *ptr++ = *pwcs; + } + } + else if (w < 0) /* Non-ascii control char */ + { + if (encoding == PG_UTF8) + sprintf((char *) ptr, "\\u%04X", utf8_to_unicode(pwcs)); + else + { + /* + * This case cannot happen in the current code because only + * UTF-8 signals multibyte control characters. But we may need + * to support it at some stage + */ + sprintf((char *) ptr, "\\u????"); + } + ptr += 6; + linewidth += 6; + } + else /* All other chars */ + { + int i; + + for (i = 0; i < chlen; i++) + *ptr++ = pwcs[i]; + linewidth += w; + } + len -= chlen; + } + lines->width = linewidth; + *ptr++ = '\0'; /* Terminate formatted string */ + + if (count <= 0) + exit(1); /* Screwup */ + + (lines + 1)->ptr = NULL; /* terminate line array */ +} + + +/* + * Encoding validation: delete any unvalidatable characters from the string + * + * This seems redundant with existing functionality elsewhere? + */ +unsigned char * +mbvalidate(unsigned char *pwcs, int encoding) +{ + if (encoding == PG_UTF8) + mb_utf_validate(pwcs); + else + { + /* + * other encodings needing validation should add their own routines + * here + */ + } + + return pwcs; +} diff --git a/src/fe_utils/print.c b/src/fe_utils/print.c new file mode 100644 index 0000000..966a772 --- /dev/null +++ b/src/fe_utils/print.c @@ -0,0 +1,3663 @@ +/*------------------------------------------------------------------------- + * + * Query-result printing support for frontend code + * + * This file used to be part of psql, but now it's separated out to allow + * other frontend programs to use it. Because the printing code needs + * access to the cancel_pressed flag as well as SIGPIPE trapping and + * pager open/close functions, all that stuff came with it. + * + * + * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * src/fe_utils/print.c + * + *------------------------------------------------------------------------- + */ +#include "postgres_fe.h" + +#include <limits.h> +#include <math.h> +#include <unistd.h> + +#ifndef WIN32 +#include <sys/ioctl.h> /* for ioctl() */ +#endif + +#ifdef HAVE_TERMIOS_H +#include <termios.h> +#endif + +#include "catalog/pg_type_d.h" +#include "fe_utils/mbprint.h" +#include "fe_utils/print.h" + +/* + * If the calling program doesn't have any mechanism for setting + * cancel_pressed, it will have no effect. + * + * Note: print.c's general strategy for when to check cancel_pressed is to do + * so at completion of each row of output. + */ +volatile sig_atomic_t cancel_pressed = false; + +static bool always_ignore_sigpipe = false; + +/* info for locale-aware numeric formatting; set up by setDecimalLocale() */ +static char *decimal_point; +static int groupdigits; +static char *thousands_sep; + +static char default_footer[100]; +static printTableFooter default_footer_cell = {default_footer, NULL}; + +/* Line style control structures */ +const printTextFormat pg_asciiformat = +{ + "ascii", + { + {"-", "+", "+", "+"}, + {"-", "+", "+", "+"}, + {"-", "+", "+", "+"}, + {"", "|", "|", "|"} + }, + "|", + "|", + "|", + " ", + "+", + " ", + "+", + ".", + ".", + true +}; + +const printTextFormat pg_asciiformat_old = +{ + "old-ascii", + { + {"-", "+", "+", "+"}, + {"-", "+", "+", "+"}, + {"-", "+", "+", "+"}, + {"", "|", "|", "|"} + }, + ":", + ";", + " ", + "+", + " ", + " ", + " ", + " ", + " ", + false +}; + +/* Default unicode linestyle format */ +printTextFormat pg_utf8format; + +typedef struct unicodeStyleRowFormat +{ + const char *horizontal; + const char *vertical_and_right[2]; + const char *vertical_and_left[2]; +} unicodeStyleRowFormat; + +typedef struct unicodeStyleColumnFormat +{ + const char *vertical; + const char *vertical_and_horizontal[2]; + const char *up_and_horizontal[2]; + const char *down_and_horizontal[2]; +} unicodeStyleColumnFormat; + +typedef struct unicodeStyleBorderFormat +{ + const char *up_and_right; + const char *vertical; + const char *down_and_right; + const char *horizontal; + const char *down_and_left; + const char *left_and_right; +} unicodeStyleBorderFormat; + +typedef struct unicodeStyleFormat +{ + unicodeStyleRowFormat row_style[2]; + unicodeStyleColumnFormat column_style[2]; + unicodeStyleBorderFormat border_style[2]; + const char *header_nl_left; + const char *header_nl_right; + const char *nl_left; + const char *nl_right; + const char *wrap_left; + const char *wrap_right; + bool wrap_right_border; +} unicodeStyleFormat; + +static const unicodeStyleFormat unicode_style = { + { + { + /* ─ */ + "\342\224\200", + /* ├╟ */ + {"\342\224\234", "\342\225\237"}, + /* ┤╢ */ + {"\342\224\244", "\342\225\242"}, + }, + { + /* ═ */ + "\342\225\220", + /* ╞╠ */ + {"\342\225\236", "\342\225\240"}, + /* ╡╣ */ + {"\342\225\241", "\342\225\243"}, + }, + }, + { + { + /* │ */ + "\342\224\202", + /* ┼╪ */ + {"\342\224\274", "\342\225\252"}, + /* ┴╧ */ + {"\342\224\264", "\342\225\247"}, + /* ┬╤ */ + {"\342\224\254", "\342\225\244"}, + }, + { + /* ║ */ + "\342\225\221", + /* ╫╬ */ + {"\342\225\253", "\342\225\254"}, + /* ╨╩ */ + {"\342\225\250", "\342\225\251"}, + /* ╥╦ */ + {"\342\225\245", "\342\225\246"}, + }, + }, + { + /* └│┌─┐┘ */ + {"\342\224\224", "\342\224\202", "\342\224\214", "\342\224\200", "\342\224\220", "\342\224\230"}, + /* ╚║╔═╗╝ */ + {"\342\225\232", "\342\225\221", "\342\225\224", "\342\225\220", "\342\225\227", "\342\225\235"}, + }, + " ", + "\342\206\265", /* ↵ */ + " ", + "\342\206\265", /* ↵ */ + "\342\200\246", /* … */ + "\342\200\246", /* … */ + true +}; + + +/* Local functions */ +static int strlen_max_width(unsigned char *str, int *target_width, int encoding); +static void IsPagerNeeded(const printTableContent *cont, int extra_lines, bool expanded, + FILE **fout, bool *is_pager); + +static void print_aligned_vertical(const printTableContent *cont, + FILE *fout, bool is_pager); + + +/* Count number of digits in integral part of number */ +static int +integer_digits(const char *my_str) +{ + /* ignoring any sign ... */ + if (my_str[0] == '-' || my_str[0] == '+') + my_str++; + /* ... count initial integral digits */ + return strspn(my_str, "0123456789"); +} + +/* Compute additional length required for locale-aware numeric output */ +static int +additional_numeric_locale_len(const char *my_str) +{ + int int_len = integer_digits(my_str), + len = 0; + + /* Account for added thousands_sep instances */ + if (int_len > groupdigits) + len += ((int_len - 1) / groupdigits) * strlen(thousands_sep); + + /* Account for possible additional length of decimal_point */ + if (strchr(my_str, '.') != NULL) + len += strlen(decimal_point) - 1; + + return len; +} + +/* + * Format a numeric value per current LC_NUMERIC locale setting + * + * Returns the appropriately formatted string in a new allocated block, + * caller must free. + * + * setDecimalLocale() must have been called earlier. + */ +static char * +format_numeric_locale(const char *my_str) +{ + char *new_str; + int new_len, + int_len, + leading_digits, + i, + new_str_pos; + + /* + * If the string doesn't look like a number, return it unchanged. This + * check is essential to avoid mangling already-localized "money" values. + */ + if (strspn(my_str, "0123456789+-.eE") != strlen(my_str)) + return pg_strdup(my_str); + + new_len = strlen(my_str) + additional_numeric_locale_len(my_str); + new_str = pg_malloc(new_len + 1); + new_str_pos = 0; + int_len = integer_digits(my_str); + + /* number of digits in first thousands group */ + leading_digits = int_len % groupdigits; + if (leading_digits == 0) + leading_digits = groupdigits; + + /* process sign */ + if (my_str[0] == '-' || my_str[0] == '+') + { + new_str[new_str_pos++] = my_str[0]; + my_str++; + } + + /* process integer part of number */ + for (i = 0; i < int_len; i++) + { + /* Time to insert separator? */ + if (i > 0 && --leading_digits == 0) + { + strcpy(&new_str[new_str_pos], thousands_sep); + new_str_pos += strlen(thousands_sep); + leading_digits = groupdigits; + } + new_str[new_str_pos++] = my_str[i]; + } + + /* handle decimal point if any */ + if (my_str[i] == '.') + { + strcpy(&new_str[new_str_pos], decimal_point); + new_str_pos += strlen(decimal_point); + i++; + } + + /* copy the rest (fractional digits and/or exponent, and \0 terminator) */ + strcpy(&new_str[new_str_pos], &my_str[i]); + + /* assert we didn't underestimate new_len (an overestimate is OK) */ + Assert(strlen(new_str) <= new_len); + + return new_str; +} + + +/* + * fputnbytes: print exactly N bytes to a file + * + * We avoid using %.*s here because it can misbehave if the data + * is not valid in what libc thinks is the prevailing encoding. + */ +static void +fputnbytes(FILE *f, const char *str, size_t n) +{ + while (n-- > 0) + fputc(*str++, f); +} + + +static void +print_separator(struct separator sep, FILE *fout) +{ + if (sep.separator_zero) + fputc('\000', fout); + else if (sep.separator) + fputs(sep.separator, fout); +} + + +/* + * Return the list of explicitly-requested footers or, when applicable, the + * default "(xx rows)" footer. Always omit the default footer when given + * non-default footers, "\pset footer off", or a specific instruction to that + * effect from a calling backslash command. Vertical formats number each row, + * making the default footer redundant; they do not call this function. + * + * The return value may point to static storage; do not keep it across calls. + */ +static printTableFooter * +footers_with_default(const printTableContent *cont) +{ + if (cont->footers == NULL && cont->opt->default_footer) + { + unsigned long total_records; + + total_records = cont->opt->prior_records + cont->nrows; + snprintf(default_footer, sizeof(default_footer), + ngettext("(%lu row)", "(%lu rows)", total_records), + total_records); + + return &default_footer_cell; + } + else + return cont->footers; +} + + +/*************************/ +/* Unaligned text */ +/*************************/ + + +static void +print_unaligned_text(const printTableContent *cont, FILE *fout) +{ + bool opt_tuples_only = cont->opt->tuples_only; + unsigned int i; + const char *const *ptr; + bool need_recordsep = false; + + if (cancel_pressed) + return; + + if (cont->opt->start_table) + { + /* print title */ + if (!opt_tuples_only && cont->title) + { + fputs(cont->title, fout); + print_separator(cont->opt->recordSep, fout); + } + + /* print headers */ + if (!opt_tuples_only) + { + for (ptr = cont->headers; *ptr; ptr++) + { + if (ptr != cont->headers) + print_separator(cont->opt->fieldSep, fout); + fputs(*ptr, fout); + } + need_recordsep = true; + } + } + else + /* assume continuing printout */ + need_recordsep = true; + + /* print cells */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + if (need_recordsep) + { + print_separator(cont->opt->recordSep, fout); + need_recordsep = false; + if (cancel_pressed) + break; + } + fputs(*ptr, fout); + + if ((i + 1) % cont->ncolumns) + print_separator(cont->opt->fieldSep, fout); + else + need_recordsep = true; + } + + /* print footers */ + if (cont->opt->stop_table) + { + printTableFooter *footers = footers_with_default(cont); + + if (!opt_tuples_only && footers != NULL && !cancel_pressed) + { + printTableFooter *f; + + for (f = footers; f; f = f->next) + { + if (need_recordsep) + { + print_separator(cont->opt->recordSep, fout); + need_recordsep = false; + } + fputs(f->data, fout); + need_recordsep = true; + } + } + + /* + * The last record is terminated by a newline, independent of the set + * record separator. But when the record separator is a zero byte, we + * use that (compatible with find -print0 and xargs). + */ + if (need_recordsep) + { + if (cont->opt->recordSep.separator_zero) + print_separator(cont->opt->recordSep, fout); + else + fputc('\n', fout); + } + } +} + + +static void +print_unaligned_vertical(const printTableContent *cont, FILE *fout) +{ + bool opt_tuples_only = cont->opt->tuples_only; + unsigned int i; + const char *const *ptr; + bool need_recordsep = false; + + if (cancel_pressed) + return; + + if (cont->opt->start_table) + { + /* print title */ + if (!opt_tuples_only && cont->title) + { + fputs(cont->title, fout); + need_recordsep = true; + } + } + else + /* assume continuing printout */ + need_recordsep = true; + + /* print records */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + if (need_recordsep) + { + /* record separator is 2 occurrences of recordsep in this mode */ + print_separator(cont->opt->recordSep, fout); + print_separator(cont->opt->recordSep, fout); + need_recordsep = false; + if (cancel_pressed) + break; + } + + fputs(cont->headers[i % cont->ncolumns], fout); + print_separator(cont->opt->fieldSep, fout); + fputs(*ptr, fout); + + if ((i + 1) % cont->ncolumns) + print_separator(cont->opt->recordSep, fout); + else + need_recordsep = true; + } + + if (cont->opt->stop_table) + { + /* print footers */ + if (!opt_tuples_only && cont->footers != NULL && !cancel_pressed) + { + printTableFooter *f; + + print_separator(cont->opt->recordSep, fout); + for (f = cont->footers; f; f = f->next) + { + print_separator(cont->opt->recordSep, fout); + fputs(f->data, fout); + } + } + + /* see above in print_unaligned_text() */ + if (need_recordsep) + { + if (cont->opt->recordSep.separator_zero) + print_separator(cont->opt->recordSep, fout); + else + fputc('\n', fout); + } + } +} + + +/********************/ +/* Aligned text */ +/********************/ + + +/* draw "line" */ +static void +_print_horizontal_line(const unsigned int ncolumns, const unsigned int *widths, + unsigned short border, printTextRule pos, + const printTextFormat *format, + FILE *fout) +{ + const printTextLineFormat *lformat = &format->lrule[pos]; + unsigned int i, + j; + + if (border == 1) + fputs(lformat->hrule, fout); + else if (border == 2) + fprintf(fout, "%s%s", lformat->leftvrule, lformat->hrule); + + for (i = 0; i < ncolumns; i++) + { + for (j = 0; j < widths[i]; j++) + fputs(lformat->hrule, fout); + + if (i < ncolumns - 1) + { + if (border == 0) + fputc(' ', fout); + else + fprintf(fout, "%s%s%s", lformat->hrule, + lformat->midvrule, lformat->hrule); + } + } + + if (border == 2) + fprintf(fout, "%s%s", lformat->hrule, lformat->rightvrule); + else if (border == 1) + fputs(lformat->hrule, fout); + + fputc('\n', fout); +} + + +/* + * Print pretty boxes around cells. + */ +static void +print_aligned_text(const printTableContent *cont, FILE *fout, bool is_pager) +{ + bool opt_tuples_only = cont->opt->tuples_only; + int encoding = cont->opt->encoding; + unsigned short opt_border = cont->opt->border; + const printTextFormat *format = get_line_style(cont->opt); + const printTextLineFormat *dformat = &format->lrule[PRINT_RULE_DATA]; + + unsigned int col_count = 0, + cell_count = 0; + + unsigned int i, + j; + + unsigned int *width_header, + *max_width, + *width_wrap, + *width_average; + unsigned int *max_nl_lines, /* value split by newlines */ + *curr_nl_line, + *max_bytes; + unsigned char **format_buf; + unsigned int width_total; + unsigned int total_header_width; + unsigned int extra_row_output_lines = 0; + unsigned int extra_output_lines = 0; + + const char *const *ptr; + + struct lineptr **col_lineptrs; /* pointers to line pointer per column */ + + bool *header_done; /* Have all header lines been output? */ + int *bytes_output; /* Bytes output for column value */ + printTextLineWrap *wrap; /* Wrap status for each column */ + int output_columns = 0; /* Width of interactive console */ + bool is_local_pager = false; + + if (cancel_pressed) + return; + + if (opt_border > 2) + opt_border = 2; + + if (cont->ncolumns > 0) + { + col_count = cont->ncolumns; + width_header = pg_malloc0(col_count * sizeof(*width_header)); + width_average = pg_malloc0(col_count * sizeof(*width_average)); + max_width = pg_malloc0(col_count * sizeof(*max_width)); + width_wrap = pg_malloc0(col_count * sizeof(*width_wrap)); + max_nl_lines = pg_malloc0(col_count * sizeof(*max_nl_lines)); + curr_nl_line = pg_malloc0(col_count * sizeof(*curr_nl_line)); + col_lineptrs = pg_malloc0(col_count * sizeof(*col_lineptrs)); + max_bytes = pg_malloc0(col_count * sizeof(*max_bytes)); + format_buf = pg_malloc0(col_count * sizeof(*format_buf)); + header_done = pg_malloc0(col_count * sizeof(*header_done)); + bytes_output = pg_malloc0(col_count * sizeof(*bytes_output)); + wrap = pg_malloc0(col_count * sizeof(*wrap)); + } + else + { + width_header = NULL; + width_average = NULL; + max_width = NULL; + width_wrap = NULL; + max_nl_lines = NULL; + curr_nl_line = NULL; + col_lineptrs = NULL; + max_bytes = NULL; + format_buf = NULL; + header_done = NULL; + bytes_output = NULL; + wrap = NULL; + } + + /* scan all column headers, find maximum width and max max_nl_lines */ + for (i = 0; i < col_count; i++) + { + int width, + nl_lines, + bytes_required; + + pg_wcssize((const unsigned char *) cont->headers[i], strlen(cont->headers[i]), + encoding, &width, &nl_lines, &bytes_required); + if (width > max_width[i]) + max_width[i] = width; + if (nl_lines > max_nl_lines[i]) + max_nl_lines[i] = nl_lines; + if (bytes_required > max_bytes[i]) + max_bytes[i] = bytes_required; + if (nl_lines > extra_row_output_lines) + extra_row_output_lines = nl_lines; + + width_header[i] = width; + } + /* Add height of tallest header column */ + extra_output_lines += extra_row_output_lines; + extra_row_output_lines = 0; + + /* scan all cells, find maximum width, compute cell_count */ + for (i = 0, ptr = cont->cells; *ptr; ptr++, i++, cell_count++) + { + int width, + nl_lines, + bytes_required; + + pg_wcssize((const unsigned char *) *ptr, strlen(*ptr), encoding, + &width, &nl_lines, &bytes_required); + + if (width > max_width[i % col_count]) + max_width[i % col_count] = width; + if (nl_lines > max_nl_lines[i % col_count]) + max_nl_lines[i % col_count] = nl_lines; + if (bytes_required > max_bytes[i % col_count]) + max_bytes[i % col_count] = bytes_required; + + width_average[i % col_count] += width; + } + + /* If we have rows, compute average */ + if (col_count != 0 && cell_count != 0) + { + int rows = cell_count / col_count; + + for (i = 0; i < col_count; i++) + width_average[i] /= rows; + } + + /* adjust the total display width based on border style */ + if (opt_border == 0) + width_total = col_count; + else if (opt_border == 1) + width_total = col_count * 3 - ((col_count > 0) ? 1 : 0); + else + width_total = col_count * 3 + 1; + total_header_width = width_total; + + for (i = 0; i < col_count; i++) + { + width_total += max_width[i]; + total_header_width += width_header[i]; + } + + /* + * At this point: max_width[] contains the max width of each column, + * max_nl_lines[] contains the max number of lines in each column, + * max_bytes[] contains the maximum storage space for formatting strings, + * width_total contains the giant width sum. Now we allocate some memory + * for line pointers. + */ + for (i = 0; i < col_count; i++) + { + /* Add entry for ptr == NULL array termination */ + col_lineptrs[i] = pg_malloc0((max_nl_lines[i] + 1) * + sizeof(**col_lineptrs)); + + format_buf[i] = pg_malloc(max_bytes[i] + 1); + + col_lineptrs[i]->ptr = format_buf[i]; + } + + /* Default word wrap to the full width, i.e. no word wrap */ + for (i = 0; i < col_count; i++) + width_wrap[i] = max_width[i]; + + /* + * Choose target output width: \pset columns, or $COLUMNS, or ioctl + */ + if (cont->opt->columns > 0) + output_columns = cont->opt->columns; + else if ((fout == stdout && isatty(fileno(stdout))) || is_pager) + { + if (cont->opt->env_columns > 0) + output_columns = cont->opt->env_columns; +#ifdef TIOCGWINSZ + else + { + struct winsize screen_size; + + if (ioctl(fileno(stdout), TIOCGWINSZ, &screen_size) != -1) + output_columns = screen_size.ws_col; + } +#endif + } + + if (cont->opt->format == PRINT_WRAPPED) + { + /* + * Optional optimized word wrap. Shrink columns with a high max/avg + * ratio. Slightly bias against wider columns. (Increases chance a + * narrow column will fit in its cell.) If available columns is + * positive... and greater than the width of the unshrinkable column + * headers + */ + if (output_columns > 0 && output_columns >= total_header_width) + { + /* While there is still excess width... */ + while (width_total > output_columns) + { + double max_ratio = 0; + int worst_col = -1; + + /* + * Find column that has the highest ratio of its maximum width + * compared to its average width. This tells us which column + * will produce the fewest wrapped values if shortened. + * width_wrap starts as equal to max_width. + */ + for (i = 0; i < col_count; i++) + { + if (width_average[i] && width_wrap[i] > width_header[i]) + { + /* Penalize wide columns by 1% of their width */ + double ratio; + + ratio = (double) width_wrap[i] / width_average[i] + + max_width[i] * 0.01; + if (ratio > max_ratio) + { + max_ratio = ratio; + worst_col = i; + } + } + } + + /* Exit loop if we can't squeeze any more. */ + if (worst_col == -1) + break; + + /* Decrease width of target column by one. */ + width_wrap[worst_col]--; + width_total--; + } + } + } + + /* + * If in expanded auto mode, we have now calculated the expected width, so + * we can now escape to vertical mode if necessary. If the output has + * only one column, the expanded format would be wider than the regular + * format, so don't use it in that case. + */ + if (cont->opt->expanded == 2 && output_columns > 0 && cont->ncolumns > 1 && + (output_columns < total_header_width || output_columns < width_total)) + { + print_aligned_vertical(cont, fout, is_pager); + goto cleanup; + } + + /* If we wrapped beyond the display width, use the pager */ + if (!is_pager && fout == stdout && output_columns > 0 && + (output_columns < total_header_width || output_columns < width_total)) + { + fout = PageOutput(INT_MAX, cont->opt); /* force pager */ + is_pager = is_local_pager = true; + } + + /* Check if newlines or our wrapping now need the pager */ + if (!is_pager && fout == stdout) + { + /* scan all cells, find maximum width, compute cell_count */ + for (i = 0, ptr = cont->cells; *ptr; ptr++, cell_count++) + { + int width, + nl_lines, + bytes_required; + + pg_wcssize((const unsigned char *) *ptr, strlen(*ptr), encoding, + &width, &nl_lines, &bytes_required); + + /* + * A row can have both wrapping and newlines that cause it to + * display across multiple lines. We check for both cases below. + */ + if (width > 0 && width_wrap[i]) + { + unsigned int extra_lines; + + /* don't count the first line of nl_lines - it's not "extra" */ + extra_lines = ((width - 1) / width_wrap[i]) + nl_lines - 1; + if (extra_lines > extra_row_output_lines) + extra_row_output_lines = extra_lines; + } + + /* i is the current column number: increment with wrap */ + if (++i >= col_count) + { + i = 0; + /* At last column of each row, add tallest column height */ + extra_output_lines += extra_row_output_lines; + extra_row_output_lines = 0; + } + } + IsPagerNeeded(cont, extra_output_lines, false, &fout, &is_pager); + is_local_pager = is_pager; + } + + /* time to output */ + if (cont->opt->start_table) + { + /* print title */ + if (cont->title && !opt_tuples_only) + { + int width, + height; + + pg_wcssize((const unsigned char *) cont->title, strlen(cont->title), + encoding, &width, &height, NULL); + if (width >= width_total) + /* Aligned */ + fprintf(fout, "%s\n", cont->title); + else + /* Centered */ + fprintf(fout, "%-*s%s\n", (width_total - width) / 2, "", + cont->title); + } + + /* print headers */ + if (!opt_tuples_only) + { + int more_col_wrapping; + int curr_nl_line; + + if (opt_border == 2) + _print_horizontal_line(col_count, width_wrap, opt_border, + PRINT_RULE_TOP, format, fout); + + for (i = 0; i < col_count; i++) + pg_wcsformat((const unsigned char *) cont->headers[i], + strlen(cont->headers[i]), encoding, + col_lineptrs[i], max_nl_lines[i]); + + more_col_wrapping = col_count; + curr_nl_line = 0; + memset(header_done, false, col_count * sizeof(bool)); + while (more_col_wrapping) + { + if (opt_border == 2) + fputs(dformat->leftvrule, fout); + + for (i = 0; i < cont->ncolumns; i++) + { + struct lineptr *this_line = col_lineptrs[i] + curr_nl_line; + unsigned int nbspace; + + if (opt_border != 0 || + (!format->wrap_right_border && i > 0)) + fputs(curr_nl_line ? format->header_nl_left : " ", + fout); + + if (!header_done[i]) + { + nbspace = width_wrap[i] - this_line->width; + + /* centered */ + fprintf(fout, "%-*s%s%-*s", + nbspace / 2, "", this_line->ptr, (nbspace + 1) / 2, ""); + + if (!(this_line + 1)->ptr) + { + more_col_wrapping--; + header_done[i] = 1; + } + } + else + fprintf(fout, "%*s", width_wrap[i], ""); + + if (opt_border != 0 || format->wrap_right_border) + fputs(!header_done[i] ? format->header_nl_right : " ", + fout); + + if (opt_border != 0 && col_count > 0 && i < col_count - 1) + fputs(dformat->midvrule, fout); + } + curr_nl_line++; + + if (opt_border == 2) + fputs(dformat->rightvrule, fout); + fputc('\n', fout); + } + + _print_horizontal_line(col_count, width_wrap, opt_border, + PRINT_RULE_MIDDLE, format, fout); + } + } + + /* print cells, one loop per row */ + for (i = 0, ptr = cont->cells; *ptr; i += col_count, ptr += col_count) + { + bool more_lines; + + if (cancel_pressed) + break; + + /* + * Format each cell. + */ + for (j = 0; j < col_count; j++) + { + pg_wcsformat((const unsigned char *) ptr[j], strlen(ptr[j]), encoding, + col_lineptrs[j], max_nl_lines[j]); + curr_nl_line[j] = 0; + } + + memset(bytes_output, 0, col_count * sizeof(int)); + + /* + * Each time through this loop, one display line is output. It can + * either be a full value or a partial value if embedded newlines + * exist or if 'format=wrapping' mode is enabled. + */ + do + { + more_lines = false; + + /* left border */ + if (opt_border == 2) + fputs(dformat->leftvrule, fout); + + /* for each column */ + for (j = 0; j < col_count; j++) + { + /* We have a valid array element, so index it */ + struct lineptr *this_line = &col_lineptrs[j][curr_nl_line[j]]; + int bytes_to_output; + int chars_to_output = width_wrap[j]; + bool finalspaces = (opt_border == 2 || + (col_count > 0 && j < col_count - 1)); + + /* Print left-hand wrap or newline mark */ + if (opt_border != 0) + { + if (wrap[j] == PRINT_LINE_WRAP_WRAP) + fputs(format->wrap_left, fout); + else if (wrap[j] == PRINT_LINE_WRAP_NEWLINE) + fputs(format->nl_left, fout); + else + fputc(' ', fout); + } + + if (!this_line->ptr) + { + /* Past newline lines so just pad for other columns */ + if (finalspaces) + fprintf(fout, "%*s", chars_to_output, ""); + } + else + { + /* Get strlen() of the characters up to width_wrap */ + bytes_to_output = + strlen_max_width(this_line->ptr + bytes_output[j], + &chars_to_output, encoding); + + /* + * If we exceeded width_wrap, it means the display width + * of a single character was wider than our target width. + * In that case, we have to pretend we are only printing + * the target display width and make the best of it. + */ + if (chars_to_output > width_wrap[j]) + chars_to_output = width_wrap[j]; + + if (cont->aligns[j] == 'r') /* Right aligned cell */ + { + /* spaces first */ + fprintf(fout, "%*s", width_wrap[j] - chars_to_output, ""); + fputnbytes(fout, + (char *) (this_line->ptr + bytes_output[j]), + bytes_to_output); + } + else /* Left aligned cell */ + { + /* spaces second */ + fputnbytes(fout, + (char *) (this_line->ptr + bytes_output[j]), + bytes_to_output); + } + + bytes_output[j] += bytes_to_output; + + /* Do we have more text to wrap? */ + if (*(this_line->ptr + bytes_output[j]) != '\0') + more_lines = true; + else + { + /* Advance to next newline line */ + curr_nl_line[j]++; + if (col_lineptrs[j][curr_nl_line[j]].ptr != NULL) + more_lines = true; + bytes_output[j] = 0; + } + } + + /* Determine next line's wrap status for this column */ + wrap[j] = PRINT_LINE_WRAP_NONE; + if (col_lineptrs[j][curr_nl_line[j]].ptr != NULL) + { + if (bytes_output[j] != 0) + wrap[j] = PRINT_LINE_WRAP_WRAP; + else if (curr_nl_line[j] != 0) + wrap[j] = PRINT_LINE_WRAP_NEWLINE; + } + + /* + * If left-aligned, pad out remaining space if needed (not + * last column, and/or wrap marks required). + */ + if (cont->aligns[j] != 'r') /* Left aligned cell */ + { + if (finalspaces || + wrap[j] == PRINT_LINE_WRAP_WRAP || + wrap[j] == PRINT_LINE_WRAP_NEWLINE) + fprintf(fout, "%*s", + width_wrap[j] - chars_to_output, ""); + } + + /* Print right-hand wrap or newline mark */ + if (wrap[j] == PRINT_LINE_WRAP_WRAP) + fputs(format->wrap_right, fout); + else if (wrap[j] == PRINT_LINE_WRAP_NEWLINE) + fputs(format->nl_right, fout); + else if (opt_border == 2 || (col_count > 0 && j < col_count - 1)) + fputc(' ', fout); + + /* Print column divider, if not the last column */ + if (opt_border != 0 && (col_count > 0 && j < col_count - 1)) + { + if (wrap[j + 1] == PRINT_LINE_WRAP_WRAP) + fputs(format->midvrule_wrap, fout); + else if (wrap[j + 1] == PRINT_LINE_WRAP_NEWLINE) + fputs(format->midvrule_nl, fout); + else if (col_lineptrs[j + 1][curr_nl_line[j + 1]].ptr == NULL) + fputs(format->midvrule_blank, fout); + else + fputs(dformat->midvrule, fout); + } + } + + /* end-of-row border */ + if (opt_border == 2) + fputs(dformat->rightvrule, fout); + fputc('\n', fout); + + } while (more_lines); + } + + if (cont->opt->stop_table) + { + printTableFooter *footers = footers_with_default(cont); + + if (opt_border == 2 && !cancel_pressed) + _print_horizontal_line(col_count, width_wrap, opt_border, + PRINT_RULE_BOTTOM, format, fout); + + /* print footers */ + if (footers && !opt_tuples_only && !cancel_pressed) + { + printTableFooter *f; + + for (f = footers; f; f = f->next) + fprintf(fout, "%s\n", f->data); + } + + fputc('\n', fout); + } + +cleanup: + /* clean up */ + for (i = 0; i < col_count; i++) + { + free(col_lineptrs[i]); + free(format_buf[i]); + } + free(width_header); + free(width_average); + free(max_width); + free(width_wrap); + free(max_nl_lines); + free(curr_nl_line); + free(col_lineptrs); + free(max_bytes); + free(format_buf); + free(header_done); + free(bytes_output); + free(wrap); + + if (is_local_pager) + ClosePager(fout); +} + + +static void +print_aligned_vertical_line(const printTextFormat *format, + const unsigned short opt_border, + unsigned long record, + unsigned int hwidth, + unsigned int dwidth, + printTextRule pos, + FILE *fout) +{ + const printTextLineFormat *lformat = &format->lrule[pos]; + unsigned int i; + int reclen = 0; + + if (opt_border == 2) + fprintf(fout, "%s%s", lformat->leftvrule, lformat->hrule); + else if (opt_border == 1) + fputs(lformat->hrule, fout); + + if (record) + { + if (opt_border == 0) + reclen = fprintf(fout, "* Record %lu", record); + else + reclen = fprintf(fout, "[ RECORD %lu ]", record); + } + if (opt_border != 2) + reclen++; + if (reclen < 0) + reclen = 0; + for (i = reclen; i < hwidth; i++) + fputs(opt_border > 0 ? lformat->hrule : " ", fout); + reclen -= hwidth; + + if (opt_border > 0) + { + if (reclen-- <= 0) + fputs(lformat->hrule, fout); + if (reclen-- <= 0) + fputs(lformat->midvrule, fout); + if (reclen-- <= 0) + fputs(lformat->hrule, fout); + } + else + { + if (reclen-- <= 0) + fputc(' ', fout); + } + if (reclen < 0) + reclen = 0; + for (i = reclen; i < dwidth; i++) + fputs(opt_border > 0 ? lformat->hrule : " ", fout); + if (opt_border == 2) + fprintf(fout, "%s%s", lformat->hrule, lformat->rightvrule); + fputc('\n', fout); +} + +static void +print_aligned_vertical(const printTableContent *cont, + FILE *fout, bool is_pager) +{ + bool opt_tuples_only = cont->opt->tuples_only; + unsigned short opt_border = cont->opt->border; + const printTextFormat *format = get_line_style(cont->opt); + const printTextLineFormat *dformat = &format->lrule[PRINT_RULE_DATA]; + int encoding = cont->opt->encoding; + unsigned long record = cont->opt->prior_records + 1; + const char *const *ptr; + unsigned int i, + hwidth = 0, + dwidth = 0, + hheight = 1, + dheight = 1, + hformatsize = 0, + dformatsize = 0; + struct lineptr *hlineptr, + *dlineptr; + bool is_local_pager = false, + hmultiline = false, + dmultiline = false; + int output_columns = 0; /* Width of interactive console */ + + if (cancel_pressed) + return; + + if (opt_border > 2) + opt_border = 2; + + if (cont->cells[0] == NULL && cont->opt->start_table && + cont->opt->stop_table) + { + printTableFooter *footers = footers_with_default(cont); + + if (!opt_tuples_only && !cancel_pressed && footers) + { + printTableFooter *f; + + for (f = footers; f; f = f->next) + fprintf(fout, "%s\n", f->data); + } + + fputc('\n', fout); + + return; + } + + /* + * Deal with the pager here instead of in printTable(), because we could + * get here via print_aligned_text() in expanded auto mode, and so we have + * to recalculate the pager requirement based on vertical output. + */ + if (!is_pager) + { + IsPagerNeeded(cont, 0, true, &fout, &is_pager); + is_local_pager = is_pager; + } + + /* Find the maximum dimensions for the headers */ + for (i = 0; i < cont->ncolumns; i++) + { + int width, + height, + fs; + + pg_wcssize((const unsigned char *) cont->headers[i], strlen(cont->headers[i]), + encoding, &width, &height, &fs); + if (width > hwidth) + hwidth = width; + if (height > hheight) + { + hheight = height; + hmultiline = true; + } + if (fs > hformatsize) + hformatsize = fs; + } + + /* find longest data cell */ + for (i = 0, ptr = cont->cells; *ptr; ptr++, i++) + { + int width, + height, + fs; + + pg_wcssize((const unsigned char *) *ptr, strlen(*ptr), encoding, + &width, &height, &fs); + if (width > dwidth) + dwidth = width; + if (height > dheight) + { + dheight = height; + dmultiline = true; + } + if (fs > dformatsize) + dformatsize = fs; + } + + /* + * We now have all the information we need to setup the formatting + * structures + */ + dlineptr = pg_malloc((sizeof(*dlineptr)) * (dheight + 1)); + hlineptr = pg_malloc((sizeof(*hlineptr)) * (hheight + 1)); + + dlineptr->ptr = pg_malloc(dformatsize); + hlineptr->ptr = pg_malloc(hformatsize); + + if (cont->opt->start_table) + { + /* print title */ + if (!opt_tuples_only && cont->title) + fprintf(fout, "%s\n", cont->title); + } + + /* + * Choose target output width: \pset columns, or $COLUMNS, or ioctl + */ + if (cont->opt->columns > 0) + output_columns = cont->opt->columns; + else if ((fout == stdout && isatty(fileno(stdout))) || is_pager) + { + if (cont->opt->env_columns > 0) + output_columns = cont->opt->env_columns; +#ifdef TIOCGWINSZ + else + { + struct winsize screen_size; + + if (ioctl(fileno(stdout), TIOCGWINSZ, &screen_size) != -1) + output_columns = screen_size.ws_col; + } +#endif + } + + /* + * Calculate available width for data in wrapped mode + */ + if (cont->opt->format == PRINT_WRAPPED) + { + unsigned int swidth, + rwidth = 0, + newdwidth; + + if (opt_border == 0) + { + /* + * For border = 0, one space in the middle. (If we discover we + * need to wrap, the spacer column will be replaced by a wrap + * marker, and we'll make room below for another wrap marker at + * the end of the line. But for now, assume no wrap is needed.) + */ + swidth = 1; + + /* We might need a column for header newline markers, too */ + if (hmultiline) + swidth++; + } + else if (opt_border == 1) + { + /* + * For border = 1, two spaces and a vrule in the middle. (As + * above, we might need one more column for a wrap marker.) + */ + swidth = 3; + + /* We might need a column for left header newline markers, too */ + if (hmultiline && (format == &pg_asciiformat_old)) + swidth++; + } + else + { + /* + * For border = 2, two more for the vrules at the beginning and + * end of the lines, plus spacer columns adjacent to these. (We + * won't need extra columns for wrap/newline markers, we'll just + * repurpose the spacers.) + */ + swidth = 7; + } + + /* Reserve a column for data newline indicators, too, if needed */ + if (dmultiline && + opt_border < 2 && format != &pg_asciiformat_old) + swidth++; + + /* Determine width required for record header lines */ + if (!opt_tuples_only) + { + if (cont->nrows > 0) + rwidth = 1 + (int) log10(cont->nrows); + if (opt_border == 0) + rwidth += 9; /* "* RECORD " */ + else if (opt_border == 1) + rwidth += 12; /* "-[ RECORD ]" */ + else + rwidth += 15; /* "+-[ RECORD ]-+" */ + } + + /* We might need to do the rest of the calculation twice */ + for (;;) + { + unsigned int width; + + /* Total width required to not wrap data */ + width = hwidth + swidth + dwidth; + /* ... and not the header lines, either */ + if (width < rwidth) + width = rwidth; + + if (output_columns > 0) + { + unsigned int min_width; + + /* Minimum acceptable width: room for just 3 columns of data */ + min_width = hwidth + swidth + 3; + /* ... but not less than what the record header lines need */ + if (min_width < rwidth) + min_width = rwidth; + + if (output_columns >= width) + { + /* Plenty of room, use native data width */ + /* (but at least enough for the record header lines) */ + newdwidth = width - hwidth - swidth; + } + else if (output_columns < min_width) + { + /* Set data width to match min_width */ + newdwidth = min_width - hwidth - swidth; + } + else + { + /* Set data width to match output_columns */ + newdwidth = output_columns - hwidth - swidth; + } + } + else + { + /* Don't know the wrap limit, so use native data width */ + /* (but at least enough for the record header lines) */ + newdwidth = width - hwidth - swidth; + } + + /* + * If we will need to wrap data and didn't already allocate a data + * newline/wrap marker column, do so and recompute. + */ + if (newdwidth < dwidth && !dmultiline && + opt_border < 2 && format != &pg_asciiformat_old) + { + dmultiline = true; + swidth++; + } + else + break; + } + + dwidth = newdwidth; + } + + /* print records */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + printTextRule pos; + int dline, + hline, + dcomplete, + hcomplete, + offset, + chars_to_output; + + if (cancel_pressed) + break; + + if (i == 0) + pos = PRINT_RULE_TOP; + else + pos = PRINT_RULE_MIDDLE; + + /* Print record header (e.g. "[ RECORD N ]") above each record */ + if (i % cont->ncolumns == 0) + { + unsigned int lhwidth = hwidth; + + if ((opt_border < 2) && + (hmultiline) && + (format == &pg_asciiformat_old)) + lhwidth++; /* for newline indicators */ + + if (!opt_tuples_only) + print_aligned_vertical_line(format, opt_border, record++, + lhwidth, dwidth, pos, fout); + else if (i != 0 || !cont->opt->start_table || opt_border == 2) + print_aligned_vertical_line(format, opt_border, 0, lhwidth, + dwidth, pos, fout); + } + + /* Format the header */ + pg_wcsformat((const unsigned char *) cont->headers[i % cont->ncolumns], + strlen(cont->headers[i % cont->ncolumns]), + encoding, hlineptr, hheight); + /* Format the data */ + pg_wcsformat((const unsigned char *) *ptr, strlen(*ptr), encoding, + dlineptr, dheight); + + /* + * Loop through header and data in parallel dealing with newlines and + * wrapped lines until they're both exhausted + */ + dline = hline = 0; + dcomplete = hcomplete = 0; + offset = 0; + chars_to_output = dlineptr[dline].width; + while (!dcomplete || !hcomplete) + { + /* Left border */ + if (opt_border == 2) + fprintf(fout, "%s", dformat->leftvrule); + + /* Header (never wrapped so just need to deal with newlines) */ + if (!hcomplete) + { + int swidth = hwidth, + target_width = hwidth; + + /* + * Left spacer or new line indicator + */ + if ((opt_border == 2) || + (hmultiline && (format == &pg_asciiformat_old))) + fputs(hline ? format->header_nl_left : " ", fout); + + /* + * Header text + */ + strlen_max_width(hlineptr[hline].ptr, &target_width, + encoding); + fprintf(fout, "%-s", hlineptr[hline].ptr); + + /* + * Spacer + */ + swidth -= target_width; + if (swidth > 0) + fprintf(fout, "%*s", swidth, " "); + + /* + * New line indicator or separator's space + */ + if (hlineptr[hline + 1].ptr) + { + /* More lines after this one due to a newline */ + if ((opt_border > 0) || + (hmultiline && (format != &pg_asciiformat_old))) + fputs(format->header_nl_right, fout); + hline++; + } + else + { + /* This was the last line of the header */ + if ((opt_border > 0) || + (hmultiline && (format != &pg_asciiformat_old))) + fputs(" ", fout); + hcomplete = 1; + } + } + else + { + unsigned int swidth = hwidth + opt_border; + + if ((opt_border < 2) && + (hmultiline) && + (format == &pg_asciiformat_old)) + swidth++; + + if ((opt_border == 0) && + (format != &pg_asciiformat_old) && + (hmultiline)) + swidth++; + + fprintf(fout, "%*s", swidth, " "); + } + + /* Separator */ + if (opt_border > 0) + { + if (offset) + fputs(format->midvrule_wrap, fout); + else if (dline == 0) + fputs(dformat->midvrule, fout); + else + fputs(format->midvrule_nl, fout); + } + + /* Data */ + if (!dcomplete) + { + int target_width = dwidth, + bytes_to_output, + swidth = dwidth; + + /* + * Left spacer or wrap indicator + */ + fputs(offset == 0 ? " " : format->wrap_left, fout); + + /* + * Data text + */ + bytes_to_output = strlen_max_width(dlineptr[dline].ptr + offset, + &target_width, encoding); + fputnbytes(fout, (char *) (dlineptr[dline].ptr + offset), + bytes_to_output); + + chars_to_output -= target_width; + offset += bytes_to_output; + + /* Spacer */ + swidth -= target_width; + + if (chars_to_output) + { + /* continuing a wrapped column */ + if ((opt_border > 1) || + (dmultiline && (format != &pg_asciiformat_old))) + { + if (swidth > 0) + fprintf(fout, "%*s", swidth, " "); + fputs(format->wrap_right, fout); + } + } + else if (dlineptr[dline + 1].ptr) + { + /* reached a newline in the column */ + if ((opt_border > 1) || + (dmultiline && (format != &pg_asciiformat_old))) + { + if (swidth > 0) + fprintf(fout, "%*s", swidth, " "); + fputs(format->nl_right, fout); + } + dline++; + offset = 0; + chars_to_output = dlineptr[dline].width; + } + else + { + /* reached the end of the cell */ + if (opt_border > 1) + { + if (swidth > 0) + fprintf(fout, "%*s", swidth, " "); + fputs(" ", fout); + } + dcomplete = 1; + } + + /* Right border */ + if (opt_border == 2) + fputs(dformat->rightvrule, fout); + + fputs("\n", fout); + } + else + { + /* + * data exhausted (this can occur if header is longer than the + * data due to newlines in the header) + */ + if (opt_border < 2) + fputs("\n", fout); + else + fprintf(fout, "%*s %s\n", dwidth, "", dformat->rightvrule); + } + } + } + + if (cont->opt->stop_table) + { + if (opt_border == 2 && !cancel_pressed) + print_aligned_vertical_line(format, opt_border, 0, hwidth, dwidth, + PRINT_RULE_BOTTOM, fout); + + /* print footers */ + if (!opt_tuples_only && cont->footers != NULL && !cancel_pressed) + { + printTableFooter *f; + + if (opt_border < 2) + fputc('\n', fout); + for (f = cont->footers; f; f = f->next) + fprintf(fout, "%s\n", f->data); + } + + fputc('\n', fout); + } + + free(hlineptr->ptr); + free(dlineptr->ptr); + free(hlineptr); + free(dlineptr); + + if (is_local_pager) + ClosePager(fout); +} + + +/**********************/ +/* CSV format */ +/**********************/ + + +static void +csv_escaped_print(const char *str, FILE *fout) +{ + const char *p; + + fputc('"', fout); + for (p = str; *p; p++) + { + if (*p == '"') + fputc('"', fout); /* double quotes are doubled */ + fputc(*p, fout); + } + fputc('"', fout); +} + +static void +csv_print_field(const char *str, FILE *fout, char sep) +{ + /*---------------- + * Enclose and escape field contents when one of these conditions is met: + * - the field separator is found in the contents. + * - the field contains a CR or LF. + * - the field contains a double quote. + * - the field is exactly "\.". + * - the field separator is either "\" or ".". + * The last two cases prevent producing a line that the server's COPY + * command would interpret as an end-of-data marker. We only really + * need to ensure that the complete line isn't exactly "\.", but for + * simplicity we apply stronger restrictions here. + *---------------- + */ + if (strchr(str, sep) != NULL || + strcspn(str, "\r\n\"") != strlen(str) || + strcmp(str, "\\.") == 0 || + sep == '\\' || sep == '.') + csv_escaped_print(str, fout); + else + fputs(str, fout); +} + +static void +print_csv_text(const printTableContent *cont, FILE *fout) +{ + const char *const *ptr; + int i; + + if (cancel_pressed) + return; + + /* + * The title and footer are never printed in csv format. The header is + * printed if opt_tuples_only is false. + * + * Despite RFC 4180 saying that end of lines are CRLF, terminate lines + * with '\n', which prints out as the system-dependent EOL string in text + * mode (typically LF on Unix and CRLF on Windows). + */ + if (cont->opt->start_table && !cont->opt->tuples_only) + { + /* print headers */ + for (ptr = cont->headers; *ptr; ptr++) + { + if (ptr != cont->headers) + fputc(cont->opt->csvFieldSep[0], fout); + csv_print_field(*ptr, fout, cont->opt->csvFieldSep[0]); + } + fputc('\n', fout); + } + + /* print cells */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + csv_print_field(*ptr, fout, cont->opt->csvFieldSep[0]); + if ((i + 1) % cont->ncolumns) + fputc(cont->opt->csvFieldSep[0], fout); + else + fputc('\n', fout); + } +} + +static void +print_csv_vertical(const printTableContent *cont, FILE *fout) +{ + const char *const *ptr; + int i; + + /* print records */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + if (cancel_pressed) + return; + + /* print name of column */ + csv_print_field(cont->headers[i % cont->ncolumns], fout, + cont->opt->csvFieldSep[0]); + + /* print field separator */ + fputc(cont->opt->csvFieldSep[0], fout); + + /* print field value */ + csv_print_field(*ptr, fout, cont->opt->csvFieldSep[0]); + + fputc('\n', fout); + } +} + + +/**********************/ +/* HTML */ +/**********************/ + + +void +html_escaped_print(const char *in, FILE *fout) +{ + const char *p; + bool leading_space = true; + + for (p = in; *p; p++) + { + switch (*p) + { + case '&': + fputs("&", fout); + break; + case '<': + fputs("<", fout); + break; + case '>': + fputs(">", fout); + break; + case '\n': + fputs("<br />\n", fout); + break; + case '"': + fputs(""", fout); + break; + case ' ': + /* protect leading space, for EXPLAIN output */ + if (leading_space) + fputs(" ", fout); + else + fputs(" ", fout); + break; + default: + fputc(*p, fout); + } + if (*p != ' ') + leading_space = false; + } +} + + +static void +print_html_text(const printTableContent *cont, FILE *fout) +{ + bool opt_tuples_only = cont->opt->tuples_only; + unsigned short opt_border = cont->opt->border; + const char *opt_table_attr = cont->opt->tableAttr; + unsigned int i; + const char *const *ptr; + + if (cancel_pressed) + return; + + if (cont->opt->start_table) + { + fprintf(fout, "<table border=\"%d\"", opt_border); + if (opt_table_attr) + fprintf(fout, " %s", opt_table_attr); + fputs(">\n", fout); + + /* print title */ + if (!opt_tuples_only && cont->title) + { + fputs(" <caption>", fout); + html_escaped_print(cont->title, fout); + fputs("</caption>\n", fout); + } + + /* print headers */ + if (!opt_tuples_only) + { + fputs(" <tr>\n", fout); + for (ptr = cont->headers; *ptr; ptr++) + { + fputs(" <th align=\"center\">", fout); + html_escaped_print(*ptr, fout); + fputs("</th>\n", fout); + } + fputs(" </tr>\n", fout); + } + } + + /* print cells */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + if (i % cont->ncolumns == 0) + { + if (cancel_pressed) + break; + fputs(" <tr valign=\"top\">\n", fout); + } + + fprintf(fout, " <td align=\"%s\">", cont->aligns[(i) % cont->ncolumns] == 'r' ? "right" : "left"); + /* is string only whitespace? */ + if ((*ptr)[strspn(*ptr, " \t")] == '\0') + fputs(" ", fout); + else + html_escaped_print(*ptr, fout); + + fputs("</td>\n", fout); + + if ((i + 1) % cont->ncolumns == 0) + fputs(" </tr>\n", fout); + } + + if (cont->opt->stop_table) + { + printTableFooter *footers = footers_with_default(cont); + + fputs("</table>\n", fout); + + /* print footers */ + if (!opt_tuples_only && footers != NULL && !cancel_pressed) + { + printTableFooter *f; + + fputs("<p>", fout); + for (f = footers; f; f = f->next) + { + html_escaped_print(f->data, fout); + fputs("<br />\n", fout); + } + fputs("</p>", fout); + } + + fputc('\n', fout); + } +} + + +static void +print_html_vertical(const printTableContent *cont, FILE *fout) +{ + bool opt_tuples_only = cont->opt->tuples_only; + unsigned short opt_border = cont->opt->border; + const char *opt_table_attr = cont->opt->tableAttr; + unsigned long record = cont->opt->prior_records + 1; + unsigned int i; + const char *const *ptr; + + if (cancel_pressed) + return; + + if (cont->opt->start_table) + { + fprintf(fout, "<table border=\"%d\"", opt_border); + if (opt_table_attr) + fprintf(fout, " %s", opt_table_attr); + fputs(">\n", fout); + + /* print title */ + if (!opt_tuples_only && cont->title) + { + fputs(" <caption>", fout); + html_escaped_print(cont->title, fout); + fputs("</caption>\n", fout); + } + } + + /* print records */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + if (i % cont->ncolumns == 0) + { + if (cancel_pressed) + break; + if (!opt_tuples_only) + fprintf(fout, + "\n <tr><td colspan=\"2\" align=\"center\">Record %lu</td></tr>\n", + record++); + else + fputs("\n <tr><td colspan=\"2\"> </td></tr>\n", fout); + } + fputs(" <tr valign=\"top\">\n" + " <th>", fout); + html_escaped_print(cont->headers[i % cont->ncolumns], fout); + fputs("</th>\n", fout); + + fprintf(fout, " <td align=\"%s\">", cont->aligns[i % cont->ncolumns] == 'r' ? "right" : "left"); + /* is string only whitespace? */ + if ((*ptr)[strspn(*ptr, " \t")] == '\0') + fputs(" ", fout); + else + html_escaped_print(*ptr, fout); + + fputs("</td>\n </tr>\n", fout); + } + + if (cont->opt->stop_table) + { + fputs("</table>\n", fout); + + /* print footers */ + if (!opt_tuples_only && cont->footers != NULL && !cancel_pressed) + { + printTableFooter *f; + + fputs("<p>", fout); + for (f = cont->footers; f; f = f->next) + { + html_escaped_print(f->data, fout); + fputs("<br />\n", fout); + } + fputs("</p>", fout); + } + + fputc('\n', fout); + } +} + + +/*************************/ +/* ASCIIDOC */ +/*************************/ + + +static void +asciidoc_escaped_print(const char *in, FILE *fout) +{ + const char *p; + + for (p = in; *p; p++) + { + switch (*p) + { + case '|': + fputs("\\|", fout); + break; + default: + fputc(*p, fout); + } + } +} + +static void +print_asciidoc_text(const printTableContent *cont, FILE *fout) +{ + bool opt_tuples_only = cont->opt->tuples_only; + unsigned short opt_border = cont->opt->border; + unsigned int i; + const char *const *ptr; + + if (cancel_pressed) + return; + + if (cont->opt->start_table) + { + /* print table in new paragraph - enforce preliminary new line */ + fputs("\n", fout); + + /* print title */ + if (!opt_tuples_only && cont->title) + { + fputs(".", fout); + fputs(cont->title, fout); + fputs("\n", fout); + } + + /* print table [] header definition */ + fprintf(fout, "[%scols=\"", !opt_tuples_only ? "options=\"header\"," : ""); + for (i = 0; i < cont->ncolumns; i++) + { + if (i != 0) + fputs(",", fout); + fprintf(fout, "%s", cont->aligns[(i) % cont->ncolumns] == 'r' ? ">l" : "<l"); + } + fputs("\"", fout); + switch (opt_border) + { + case 0: + fputs(",frame=\"none\",grid=\"none\"", fout); + break; + case 1: + fputs(",frame=\"none\"", fout); + break; + case 2: + fputs(",frame=\"all\",grid=\"all\"", fout); + break; + } + fputs("]\n", fout); + fputs("|====\n", fout); + + /* print headers */ + if (!opt_tuples_only) + { + for (ptr = cont->headers; *ptr; ptr++) + { + if (ptr != cont->headers) + fputs(" ", fout); + fputs("^l|", fout); + asciidoc_escaped_print(*ptr, fout); + } + fputs("\n", fout); + } + } + + /* print cells */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + if (i % cont->ncolumns == 0) + { + if (cancel_pressed) + break; + } + + if (i % cont->ncolumns != 0) + fputs(" ", fout); + fputs("|", fout); + + /* protect against needless spaces */ + if ((*ptr)[strspn(*ptr, " \t")] == '\0') + { + if ((i + 1) % cont->ncolumns != 0) + fputs(" ", fout); + } + else + asciidoc_escaped_print(*ptr, fout); + + if ((i + 1) % cont->ncolumns == 0) + fputs("\n", fout); + } + + fputs("|====\n", fout); + + if (cont->opt->stop_table) + { + printTableFooter *footers = footers_with_default(cont); + + /* print footers */ + if (!opt_tuples_only && footers != NULL && !cancel_pressed) + { + printTableFooter *f; + + fputs("\n....\n", fout); + for (f = footers; f; f = f->next) + { + fputs(f->data, fout); + fputs("\n", fout); + } + fputs("....\n", fout); + } + } +} + +static void +print_asciidoc_vertical(const printTableContent *cont, FILE *fout) +{ + bool opt_tuples_only = cont->opt->tuples_only; + unsigned short opt_border = cont->opt->border; + unsigned long record = cont->opt->prior_records + 1; + unsigned int i; + const char *const *ptr; + + if (cancel_pressed) + return; + + if (cont->opt->start_table) + { + /* print table in new paragraph - enforce preliminary new line */ + fputs("\n", fout); + + /* print title */ + if (!opt_tuples_only && cont->title) + { + fputs(".", fout); + fputs(cont->title, fout); + fputs("\n", fout); + } + + /* print table [] header definition */ + fputs("[cols=\"h,l\"", fout); + switch (opt_border) + { + case 0: + fputs(",frame=\"none\",grid=\"none\"", fout); + break; + case 1: + fputs(",frame=\"none\"", fout); + break; + case 2: + fputs(",frame=\"all\",grid=\"all\"", fout); + break; + } + fputs("]\n", fout); + fputs("|====\n", fout); + } + + /* print records */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + if (i % cont->ncolumns == 0) + { + if (cancel_pressed) + break; + if (!opt_tuples_only) + fprintf(fout, + "2+^|Record %lu\n", + record++); + else + fputs("2+|\n", fout); + } + + fputs("<l|", fout); + asciidoc_escaped_print(cont->headers[i % cont->ncolumns], fout); + + fprintf(fout, " %s|", cont->aligns[i % cont->ncolumns] == 'r' ? ">l" : "<l"); + /* is string only whitespace? */ + if ((*ptr)[strspn(*ptr, " \t")] == '\0') + fputs(" ", fout); + else + asciidoc_escaped_print(*ptr, fout); + fputs("\n", fout); + } + + fputs("|====\n", fout); + + if (cont->opt->stop_table) + { + /* print footers */ + if (!opt_tuples_only && cont->footers != NULL && !cancel_pressed) + { + printTableFooter *f; + + fputs("\n....\n", fout); + for (f = cont->footers; f; f = f->next) + { + fputs(f->data, fout); + fputs("\n", fout); + } + fputs("....\n", fout); + } + } +} + + +/*************************/ +/* LaTeX */ +/*************************/ + + +static void +latex_escaped_print(const char *in, FILE *fout) +{ + const char *p; + + for (p = in; *p; p++) + switch (*p) + { + /* + * We convert ASCII characters per the recommendations in + * Scott Pakin's "The Comprehensive LATEX Symbol List", + * available from CTAN. For non-ASCII, you're on your own. + */ + case '#': + fputs("\\#", fout); + break; + case '$': + fputs("\\$", fout); + break; + case '%': + fputs("\\%", fout); + break; + case '&': + fputs("\\&", fout); + break; + case '<': + fputs("\\textless{}", fout); + break; + case '>': + fputs("\\textgreater{}", fout); + break; + case '\\': + fputs("\\textbackslash{}", fout); + break; + case '^': + fputs("\\^{}", fout); + break; + case '_': + fputs("\\_", fout); + break; + case '{': + fputs("\\{", fout); + break; + case '|': + fputs("\\textbar{}", fout); + break; + case '}': + fputs("\\}", fout); + break; + case '~': + fputs("\\~{}", fout); + break; + case '\n': + /* This is not right, but doing it right seems too hard */ + fputs("\\\\", fout); + break; + default: + fputc(*p, fout); + } +} + + +static void +print_latex_text(const printTableContent *cont, FILE *fout) +{ + bool opt_tuples_only = cont->opt->tuples_only; + unsigned short opt_border = cont->opt->border; + unsigned int i; + const char *const *ptr; + + if (cancel_pressed) + return; + + if (opt_border > 3) + opt_border = 3; + + if (cont->opt->start_table) + { + /* print title */ + if (!opt_tuples_only && cont->title) + { + fputs("\\begin{center}\n", fout); + latex_escaped_print(cont->title, fout); + fputs("\n\\end{center}\n\n", fout); + } + + /* begin environment and set alignments and borders */ + fputs("\\begin{tabular}{", fout); + + if (opt_border >= 2) + fputs("| ", fout); + for (i = 0; i < cont->ncolumns; i++) + { + fputc(*(cont->aligns + i), fout); + if (opt_border != 0 && i < cont->ncolumns - 1) + fputs(" | ", fout); + } + if (opt_border >= 2) + fputs(" |", fout); + + fputs("}\n", fout); + + if (!opt_tuples_only && opt_border >= 2) + fputs("\\hline\n", fout); + + /* print headers */ + if (!opt_tuples_only) + { + for (i = 0, ptr = cont->headers; i < cont->ncolumns; i++, ptr++) + { + if (i != 0) + fputs(" & ", fout); + fputs("\\textit{", fout); + latex_escaped_print(*ptr, fout); + fputc('}', fout); + } + fputs(" \\\\\n", fout); + fputs("\\hline\n", fout); + } + } + + /* print cells */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + latex_escaped_print(*ptr, fout); + + if ((i + 1) % cont->ncolumns == 0) + { + fputs(" \\\\\n", fout); + if (opt_border == 3) + fputs("\\hline\n", fout); + if (cancel_pressed) + break; + } + else + fputs(" & ", fout); + } + + if (cont->opt->stop_table) + { + printTableFooter *footers = footers_with_default(cont); + + if (opt_border == 2) + fputs("\\hline\n", fout); + + fputs("\\end{tabular}\n\n\\noindent ", fout); + + /* print footers */ + if (footers && !opt_tuples_only && !cancel_pressed) + { + printTableFooter *f; + + for (f = footers; f; f = f->next) + { + latex_escaped_print(f->data, fout); + fputs(" \\\\\n", fout); + } + } + + fputc('\n', fout); + } +} + + +/*************************/ +/* LaTeX longtable */ +/*************************/ + + +static void +print_latex_longtable_text(const printTableContent *cont, FILE *fout) +{ + bool opt_tuples_only = cont->opt->tuples_only; + unsigned short opt_border = cont->opt->border; + unsigned int i; + const char *opt_table_attr = cont->opt->tableAttr; + const char *next_opt_table_attr_char = opt_table_attr; + const char *last_opt_table_attr_char = NULL; + const char *const *ptr; + + if (cancel_pressed) + return; + + if (opt_border > 3) + opt_border = 3; + + if (cont->opt->start_table) + { + /* begin environment and set alignments and borders */ + fputs("\\begin{longtable}{", fout); + + if (opt_border >= 2) + fputs("| ", fout); + + for (i = 0; i < cont->ncolumns; i++) + { + /* longtable supports either a width (p) or an alignment (l/r) */ + /* Are we left-justified and was a proportional width specified? */ + if (*(cont->aligns + i) == 'l' && opt_table_attr) + { +#define LONGTABLE_WHITESPACE " \t\n" + + /* advance over whitespace */ + next_opt_table_attr_char += strspn(next_opt_table_attr_char, + LONGTABLE_WHITESPACE); + /* We have a value? */ + if (next_opt_table_attr_char[0] != '\0') + { + fputs("p{", fout); + fwrite(next_opt_table_attr_char, strcspn(next_opt_table_attr_char, + LONGTABLE_WHITESPACE), 1, fout); + last_opt_table_attr_char = next_opt_table_attr_char; + next_opt_table_attr_char += strcspn(next_opt_table_attr_char, + LONGTABLE_WHITESPACE); + fputs("\\textwidth}", fout); + } + /* use previous value */ + else if (last_opt_table_attr_char != NULL) + { + fputs("p{", fout); + fwrite(last_opt_table_attr_char, strcspn(last_opt_table_attr_char, + LONGTABLE_WHITESPACE), 1, fout); + fputs("\\textwidth}", fout); + } + else + fputc('l', fout); + } + else + fputc(*(cont->aligns + i), fout); + + if (opt_border != 0 && i < cont->ncolumns - 1) + fputs(" | ", fout); + } + + if (opt_border >= 2) + fputs(" |", fout); + + fputs("}\n", fout); + + /* print headers */ + if (!opt_tuples_only) + { + /* firsthead */ + if (opt_border >= 2) + fputs("\\toprule\n", fout); + for (i = 0, ptr = cont->headers; i < cont->ncolumns; i++, ptr++) + { + if (i != 0) + fputs(" & ", fout); + fputs("\\small\\textbf{\\textit{", fout); + latex_escaped_print(*ptr, fout); + fputs("}}", fout); + } + fputs(" \\\\\n", fout); + fputs("\\midrule\n\\endfirsthead\n", fout); + + /* secondary heads */ + if (opt_border >= 2) + fputs("\\toprule\n", fout); + for (i = 0, ptr = cont->headers; i < cont->ncolumns; i++, ptr++) + { + if (i != 0) + fputs(" & ", fout); + fputs("\\small\\textbf{\\textit{", fout); + latex_escaped_print(*ptr, fout); + fputs("}}", fout); + } + fputs(" \\\\\n", fout); + /* If the line under the row already appeared, don't do another */ + if (opt_border != 3) + fputs("\\midrule\n", fout); + fputs("\\endhead\n", fout); + + /* table name, caption? */ + if (!opt_tuples_only && cont->title) + { + /* Don't output if we are printing a line under each row */ + if (opt_border == 2) + fputs("\\bottomrule\n", fout); + fputs("\\caption[", fout); + latex_escaped_print(cont->title, fout); + fputs(" (Continued)]{", fout); + latex_escaped_print(cont->title, fout); + fputs("}\n\\endfoot\n", fout); + if (opt_border == 2) + fputs("\\bottomrule\n", fout); + fputs("\\caption[", fout); + latex_escaped_print(cont->title, fout); + fputs("]{", fout); + latex_escaped_print(cont->title, fout); + fputs("}\n\\endlastfoot\n", fout); + } + /* output bottom table line? */ + else if (opt_border >= 2) + { + fputs("\\bottomrule\n\\endfoot\n", fout); + fputs("\\bottomrule\n\\endlastfoot\n", fout); + } + } + } + + /* print cells */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + /* Add a line under each row? */ + if (i != 0 && i % cont->ncolumns != 0) + fputs("\n&\n", fout); + fputs("\\raggedright{", fout); + latex_escaped_print(*ptr, fout); + fputc('}', fout); + if ((i + 1) % cont->ncolumns == 0) + { + fputs(" \\tabularnewline\n", fout); + if (opt_border == 3) + fputs(" \\hline\n", fout); + } + if (cancel_pressed) + break; + } + + if (cont->opt->stop_table) + fputs("\\end{longtable}\n", fout); +} + + +static void +print_latex_vertical(const printTableContent *cont, FILE *fout) +{ + bool opt_tuples_only = cont->opt->tuples_only; + unsigned short opt_border = cont->opt->border; + unsigned long record = cont->opt->prior_records + 1; + unsigned int i; + const char *const *ptr; + + if (cancel_pressed) + return; + + if (opt_border > 2) + opt_border = 2; + + if (cont->opt->start_table) + { + /* print title */ + if (!opt_tuples_only && cont->title) + { + fputs("\\begin{center}\n", fout); + latex_escaped_print(cont->title, fout); + fputs("\n\\end{center}\n\n", fout); + } + + /* begin environment and set alignments and borders */ + fputs("\\begin{tabular}{", fout); + if (opt_border == 0) + fputs("cl", fout); + else if (opt_border == 1) + fputs("c|l", fout); + else if (opt_border == 2) + fputs("|c|l|", fout); + fputs("}\n", fout); + } + + /* print records */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + /* new record */ + if (i % cont->ncolumns == 0) + { + if (cancel_pressed) + break; + if (!opt_tuples_only) + { + if (opt_border == 2) + { + fputs("\\hline\n", fout); + fprintf(fout, "\\multicolumn{2}{|c|}{\\textit{Record %lu}} \\\\\n", record++); + } + else + fprintf(fout, "\\multicolumn{2}{c}{\\textit{Record %lu}} \\\\\n", record++); + } + if (opt_border >= 1) + fputs("\\hline\n", fout); + } + + latex_escaped_print(cont->headers[i % cont->ncolumns], fout); + fputs(" & ", fout); + latex_escaped_print(*ptr, fout); + fputs(" \\\\\n", fout); + } + + if (cont->opt->stop_table) + { + if (opt_border == 2) + fputs("\\hline\n", fout); + + fputs("\\end{tabular}\n\n\\noindent ", fout); + + /* print footers */ + if (cont->footers && !opt_tuples_only && !cancel_pressed) + { + printTableFooter *f; + + for (f = cont->footers; f; f = f->next) + { + latex_escaped_print(f->data, fout); + fputs(" \\\\\n", fout); + } + } + + fputc('\n', fout); + } +} + + +/*************************/ +/* Troff -ms */ +/*************************/ + + +static void +troff_ms_escaped_print(const char *in, FILE *fout) +{ + const char *p; + + for (p = in; *p; p++) + switch (*p) + { + case '\\': + fputs("\\(rs", fout); + break; + default: + fputc(*p, fout); + } +} + + +static void +print_troff_ms_text(const printTableContent *cont, FILE *fout) +{ + bool opt_tuples_only = cont->opt->tuples_only; + unsigned short opt_border = cont->opt->border; + unsigned int i; + const char *const *ptr; + + if (cancel_pressed) + return; + + if (opt_border > 2) + opt_border = 2; + + if (cont->opt->start_table) + { + /* print title */ + if (!opt_tuples_only && cont->title) + { + fputs(".LP\n.DS C\n", fout); + troff_ms_escaped_print(cont->title, fout); + fputs("\n.DE\n", fout); + } + + /* begin environment and set alignments and borders */ + fputs(".LP\n.TS\n", fout); + if (opt_border == 2) + fputs("center box;\n", fout); + else + fputs("center;\n", fout); + + for (i = 0; i < cont->ncolumns; i++) + { + fputc(*(cont->aligns + i), fout); + if (opt_border > 0 && i < cont->ncolumns - 1) + fputs(" | ", fout); + } + fputs(".\n", fout); + + /* print headers */ + if (!opt_tuples_only) + { + for (i = 0, ptr = cont->headers; i < cont->ncolumns; i++, ptr++) + { + if (i != 0) + fputc('\t', fout); + fputs("\\fI", fout); + troff_ms_escaped_print(*ptr, fout); + fputs("\\fP", fout); + } + fputs("\n_\n", fout); + } + } + + /* print cells */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + troff_ms_escaped_print(*ptr, fout); + + if ((i + 1) % cont->ncolumns == 0) + { + fputc('\n', fout); + if (cancel_pressed) + break; + } + else + fputc('\t', fout); + } + + if (cont->opt->stop_table) + { + printTableFooter *footers = footers_with_default(cont); + + fputs(".TE\n.DS L\n", fout); + + /* print footers */ + if (footers && !opt_tuples_only && !cancel_pressed) + { + printTableFooter *f; + + for (f = footers; f; f = f->next) + { + troff_ms_escaped_print(f->data, fout); + fputc('\n', fout); + } + } + + fputs(".DE\n", fout); + } +} + + +static void +print_troff_ms_vertical(const printTableContent *cont, FILE *fout) +{ + bool opt_tuples_only = cont->opt->tuples_only; + unsigned short opt_border = cont->opt->border; + unsigned long record = cont->opt->prior_records + 1; + unsigned int i; + const char *const *ptr; + unsigned short current_format = 0; /* 0=none, 1=header, 2=body */ + + if (cancel_pressed) + return; + + if (opt_border > 2) + opt_border = 2; + + if (cont->opt->start_table) + { + /* print title */ + if (!opt_tuples_only && cont->title) + { + fputs(".LP\n.DS C\n", fout); + troff_ms_escaped_print(cont->title, fout); + fputs("\n.DE\n", fout); + } + + /* begin environment and set alignments and borders */ + fputs(".LP\n.TS\n", fout); + if (opt_border == 2) + fputs("center box;\n", fout); + else + fputs("center;\n", fout); + + /* basic format */ + if (opt_tuples_only) + fputs("c l;\n", fout); + } + else + current_format = 2; /* assume tuples printed already */ + + /* print records */ + for (i = 0, ptr = cont->cells; *ptr; i++, ptr++) + { + /* new record */ + if (i % cont->ncolumns == 0) + { + if (cancel_pressed) + break; + if (!opt_tuples_only) + { + if (current_format != 1) + { + if (opt_border == 2 && record > 1) + fputs("_\n", fout); + if (current_format != 0) + fputs(".T&\n", fout); + fputs("c s.\n", fout); + current_format = 1; + } + fprintf(fout, "\\fIRecord %lu\\fP\n", record++); + } + if (opt_border >= 1) + fputs("_\n", fout); + } + + if (!opt_tuples_only) + { + if (current_format != 2) + { + if (current_format != 0) + fputs(".T&\n", fout); + if (opt_border != 1) + fputs("c l.\n", fout); + else + fputs("c | l.\n", fout); + current_format = 2; + } + } + + troff_ms_escaped_print(cont->headers[i % cont->ncolumns], fout); + fputc('\t', fout); + troff_ms_escaped_print(*ptr, fout); + + fputc('\n', fout); + } + + if (cont->opt->stop_table) + { + fputs(".TE\n.DS L\n", fout); + + /* print footers */ + if (cont->footers && !opt_tuples_only && !cancel_pressed) + { + printTableFooter *f; + + for (f = cont->footers; f; f = f->next) + { + troff_ms_escaped_print(f->data, fout); + fputc('\n', fout); + } + } + + fputs(".DE\n", fout); + } +} + + +/********************************/ +/* Public functions */ +/********************************/ + + +/* + * disable_sigpipe_trap + * + * Turn off SIGPIPE interrupt --- call this before writing to a temporary + * query output file that is a pipe. + * + * No-op on Windows, where there's no SIGPIPE interrupts. + */ +void +disable_sigpipe_trap(void) +{ +#ifndef WIN32 + pqsignal(SIGPIPE, SIG_IGN); +#endif +} + +/* + * restore_sigpipe_trap + * + * Restore normal SIGPIPE interrupt --- call this when done writing to a + * temporary query output file that was (or might have been) a pipe. + * + * Note: within psql, we enable SIGPIPE interrupts unless the permanent query + * output file is a pipe, in which case they should be kept off. This + * approach works only because psql is not currently complicated enough to + * have nested usages of short-lived output files. Otherwise we'd probably + * need a genuine save-and-restore-state approach; but for now, that would be + * useless complication. In non-psql programs, this always enables SIGPIPE. + * + * No-op on Windows, where there's no SIGPIPE interrupts. + */ +void +restore_sigpipe_trap(void) +{ +#ifndef WIN32 + pqsignal(SIGPIPE, always_ignore_sigpipe ? SIG_IGN : SIG_DFL); +#endif +} + +/* + * set_sigpipe_trap_state + * + * Set the trap state that restore_sigpipe_trap should restore to. + */ +void +set_sigpipe_trap_state(bool ignore) +{ + always_ignore_sigpipe = ignore; +} + + +/* + * PageOutput + * + * Tests if pager is needed and returns appropriate FILE pointer. + * + * If the topt argument is NULL no pager is used. + */ +FILE * +PageOutput(int lines, const printTableOpt *topt) +{ + /* check whether we need / can / are supposed to use pager */ + if (topt && topt->pager && isatty(fileno(stdin)) && isatty(fileno(stdout))) + { +#ifdef TIOCGWINSZ + unsigned short int pager = topt->pager; + int min_lines = topt->pager_min_lines; + int result; + struct winsize screen_size; + + result = ioctl(fileno(stdout), TIOCGWINSZ, &screen_size); + + /* >= accounts for a one-line prompt */ + if (result == -1 + || (lines >= screen_size.ws_row && lines >= min_lines) + || pager > 1) +#endif + { + const char *pagerprog; + FILE *pagerpipe; + + pagerprog = getenv("PSQL_PAGER"); + if (!pagerprog) + pagerprog = getenv("PAGER"); + if (!pagerprog) + pagerprog = DEFAULT_PAGER; + else + { + /* if PAGER is empty or all-white-space, don't use pager */ + if (strspn(pagerprog, " \t\r\n") == strlen(pagerprog)) + return stdout; + } + disable_sigpipe_trap(); + pagerpipe = popen(pagerprog, "w"); + if (pagerpipe) + return pagerpipe; + /* if popen fails, silently proceed without pager */ + restore_sigpipe_trap(); + } + } + + return stdout; +} + +/* + * ClosePager + * + * Close previously opened pager pipe, if any + */ +void +ClosePager(FILE *pagerpipe) +{ + if (pagerpipe && pagerpipe != stdout) + { + /* + * If printing was canceled midstream, warn about it. + * + * Some pagers like less use Ctrl-C as part of their command set. Even + * so, we abort our processing and warn the user what we did. If the + * pager quit as a result of the SIGINT, this message won't go + * anywhere ... + */ + if (cancel_pressed) + fprintf(pagerpipe, _("Interrupted\n")); + + pclose(pagerpipe); + restore_sigpipe_trap(); + } +} + +/* + * Initialise a table contents struct. + * Must be called before any other printTable method is used. + * + * The title is not duplicated; the caller must ensure that the buffer + * is available for the lifetime of the printTableContent struct. + * + * If you call this, you must call printTableCleanup once you're done with the + * table. + */ +void +printTableInit(printTableContent *const content, const printTableOpt *opt, + const char *title, const int ncolumns, const int nrows) +{ + content->opt = opt; + content->title = title; + content->ncolumns = ncolumns; + content->nrows = nrows; + + content->headers = pg_malloc0((ncolumns + 1) * sizeof(*content->headers)); + + content->cells = pg_malloc0((ncolumns * nrows + 1) * sizeof(*content->cells)); + + content->cellmustfree = NULL; + content->footers = NULL; + + content->aligns = pg_malloc0((ncolumns + 1) * sizeof(*content->align)); + + content->header = content->headers; + content->cell = content->cells; + content->footer = content->footers; + content->align = content->aligns; + content->cellsadded = 0; +} + +/* + * Add a header to the table. + * + * Headers are not duplicated; you must ensure that the header string is + * available for the lifetime of the printTableContent struct. + * + * If translate is true, the function will pass the header through gettext. + * Otherwise, the header will not be translated. + * + * align is either 'l' or 'r', and specifies the alignment for cells in this + * column. + */ +void +printTableAddHeader(printTableContent *const content, char *header, + const bool translate, const char align) +{ +#ifndef ENABLE_NLS + (void) translate; /* unused parameter */ +#endif + + if (content->header >= content->headers + content->ncolumns) + { + fprintf(stderr, _("Cannot add header to table content: " + "column count of %d exceeded.\n"), + content->ncolumns); + exit(EXIT_FAILURE); + } + + *content->header = (char *) mbvalidate((unsigned char *) header, + content->opt->encoding); +#ifdef ENABLE_NLS + if (translate) + *content->header = _(*content->header); +#endif + content->header++; + + *content->align = align; + content->align++; +} + +/* + * Add a cell to the table. + * + * Cells are not duplicated; you must ensure that the cell string is available + * for the lifetime of the printTableContent struct. + * + * If translate is true, the function will pass the cell through gettext. + * Otherwise, the cell will not be translated. + * + * If mustfree is true, the cell string is freed by printTableCleanup(). + * Note: Automatic freeing of translatable strings is not supported. + */ +void +printTableAddCell(printTableContent *const content, char *cell, + const bool translate, const bool mustfree) +{ +#ifndef ENABLE_NLS + (void) translate; /* unused parameter */ +#endif + + if (content->cellsadded >= content->ncolumns * content->nrows) + { + fprintf(stderr, _("Cannot add cell to table content: " + "total cell count of %d exceeded.\n"), + content->ncolumns * content->nrows); + exit(EXIT_FAILURE); + } + + *content->cell = (char *) mbvalidate((unsigned char *) cell, + content->opt->encoding); + +#ifdef ENABLE_NLS + if (translate) + *content->cell = _(*content->cell); +#endif + + if (mustfree) + { + if (content->cellmustfree == NULL) + content->cellmustfree = + pg_malloc0((content->ncolumns * content->nrows + 1) * sizeof(bool)); + + content->cellmustfree[content->cellsadded] = true; + } + content->cell++; + content->cellsadded++; +} + +/* + * Add a footer to the table. + * + * Footers are added as elements of a singly-linked list, and the content is + * strdup'd, so there is no need to keep the original footer string around. + * + * Footers are never translated by the function. If you want the footer + * translated you must do so yourself, before calling printTableAddFooter. The + * reason this works differently to headers and cells is that footers tend to + * be made of up individually translated components, rather than being + * translated as a whole. + */ +void +printTableAddFooter(printTableContent *const content, const char *footer) +{ + printTableFooter *f; + + f = pg_malloc0(sizeof(*f)); + f->data = pg_strdup(footer); + + if (content->footers == NULL) + content->footers = f; + else + content->footer->next = f; + + content->footer = f; +} + +/* + * Change the content of the last-added footer. + * + * The current contents of the last-added footer are freed, and replaced by the + * content given in *footer. If there was no previous footer, add a new one. + * + * The content is strdup'd, so there is no need to keep the original string + * around. + */ +void +printTableSetFooter(printTableContent *const content, const char *footer) +{ + if (content->footers != NULL) + { + free(content->footer->data); + content->footer->data = pg_strdup(footer); + } + else + printTableAddFooter(content, footer); +} + +/* + * Free all memory allocated to this struct. + * + * Once this has been called, the struct is unusable unless you pass it to + * printTableInit() again. + */ +void +printTableCleanup(printTableContent *const content) +{ + if (content->cellmustfree) + { + int i; + + for (i = 0; i < content->nrows * content->ncolumns; i++) + { + if (content->cellmustfree[i]) + free(unconstify(char *, content->cells[i])); + } + free(content->cellmustfree); + content->cellmustfree = NULL; + } + free(content->headers); + free(content->cells); + free(content->aligns); + + content->opt = NULL; + content->title = NULL; + content->headers = NULL; + content->cells = NULL; + content->aligns = NULL; + content->header = NULL; + content->cell = NULL; + content->align = NULL; + + if (content->footers) + { + for (content->footer = content->footers; content->footer;) + { + printTableFooter *f; + + f = content->footer; + content->footer = f->next; + free(f->data); + free(f); + } + } + content->footers = NULL; + content->footer = NULL; +} + +/* + * IsPagerNeeded + * + * Setup pager if required + */ +static void +IsPagerNeeded(const printTableContent *cont, int extra_lines, bool expanded, + FILE **fout, bool *is_pager) +{ + if (*fout == stdout) + { + int lines; + + if (expanded) + lines = (cont->ncolumns + 1) * cont->nrows; + else + lines = cont->nrows + 1; + + if (!cont->opt->tuples_only) + { + printTableFooter *f; + + /* + * FIXME -- this is slightly bogus: it counts the number of + * footers, not the number of lines in them. + */ + for (f = cont->footers; f; f = f->next) + lines++; + } + + *fout = PageOutput(lines + extra_lines, cont->opt); + *is_pager = (*fout != stdout); + } + else + *is_pager = false; +} + +/* + * Use this to print any table in the supported formats. + * + * cont: table data and formatting options + * fout: where to print to + * is_pager: true if caller has already redirected fout to be a pager pipe + * flog: if not null, also print the table there (for --log-file option) + */ +void +printTable(const printTableContent *cont, + FILE *fout, bool is_pager, FILE *flog) +{ + bool is_local_pager = false; + + if (cancel_pressed) + return; + + if (cont->opt->format == PRINT_NOTHING) + return; + + /* print_aligned_*() handle the pager themselves */ + if (!is_pager && + cont->opt->format != PRINT_ALIGNED && + cont->opt->format != PRINT_WRAPPED) + { + IsPagerNeeded(cont, 0, (cont->opt->expanded == 1), &fout, &is_pager); + is_local_pager = is_pager; + } + + /* clear any pre-existing error indication on the output stream */ + clearerr(fout); + + /* print the stuff */ + + if (flog) + print_aligned_text(cont, flog, false); + + switch (cont->opt->format) + { + case PRINT_UNALIGNED: + if (cont->opt->expanded == 1) + print_unaligned_vertical(cont, fout); + else + print_unaligned_text(cont, fout); + break; + case PRINT_ALIGNED: + case PRINT_WRAPPED: + + /* + * In expanded-auto mode, force vertical if a pager is passed in; + * else we may make different decisions for different hunks of the + * query result. + */ + if (cont->opt->expanded == 1 || + (cont->opt->expanded == 2 && is_pager)) + print_aligned_vertical(cont, fout, is_pager); + else + print_aligned_text(cont, fout, is_pager); + break; + case PRINT_CSV: + if (cont->opt->expanded == 1) + print_csv_vertical(cont, fout); + else + print_csv_text(cont, fout); + break; + case PRINT_HTML: + if (cont->opt->expanded == 1) + print_html_vertical(cont, fout); + else + print_html_text(cont, fout); + break; + case PRINT_ASCIIDOC: + if (cont->opt->expanded == 1) + print_asciidoc_vertical(cont, fout); + else + print_asciidoc_text(cont, fout); + break; + case PRINT_LATEX: + if (cont->opt->expanded == 1) + print_latex_vertical(cont, fout); + else + print_latex_text(cont, fout); + break; + case PRINT_LATEX_LONGTABLE: + if (cont->opt->expanded == 1) + print_latex_vertical(cont, fout); + else + print_latex_longtable_text(cont, fout); + break; + case PRINT_TROFF_MS: + if (cont->opt->expanded == 1) + print_troff_ms_vertical(cont, fout); + else + print_troff_ms_text(cont, fout); + break; + default: + fprintf(stderr, _("invalid output format (internal error): %d"), + cont->opt->format); + exit(EXIT_FAILURE); + } + + if (is_local_pager) + ClosePager(fout); +} + +/* + * Use this to print query results + * + * result: result of a successful query + * opt: formatting options + * fout: where to print to + * is_pager: true if caller has already redirected fout to be a pager pipe + * flog: if not null, also print the data there (for --log-file option) + */ +void +printQuery(const PGresult *result, const printQueryOpt *opt, + FILE *fout, bool is_pager, FILE *flog) +{ + printTableContent cont; + int i, + r, + c; + + if (cancel_pressed) + return; + + printTableInit(&cont, &opt->topt, opt->title, + PQnfields(result), PQntuples(result)); + + /* Assert caller supplied enough translate_columns[] entries */ + Assert(opt->translate_columns == NULL || + opt->n_translate_columns >= cont.ncolumns); + + for (i = 0; i < cont.ncolumns; i++) + { + printTableAddHeader(&cont, PQfname(result, i), + opt->translate_header, + column_type_alignment(PQftype(result, i))); + } + + /* set cells */ + for (r = 0; r < cont.nrows; r++) + { + for (c = 0; c < cont.ncolumns; c++) + { + char *cell; + bool mustfree = false; + bool translate; + + if (PQgetisnull(result, r, c)) + cell = opt->nullPrint ? opt->nullPrint : ""; + else + { + cell = PQgetvalue(result, r, c); + if (cont.aligns[c] == 'r' && opt->topt.numericLocale) + { + cell = format_numeric_locale(cell); + mustfree = true; + } + } + + translate = (opt->translate_columns && opt->translate_columns[c]); + printTableAddCell(&cont, cell, translate, mustfree); + } + } + + /* set footers */ + if (opt->footers) + { + char **footer; + + for (footer = opt->footers; *footer; footer++) + printTableAddFooter(&cont, *footer); + } + + printTable(&cont, fout, is_pager, flog); + printTableCleanup(&cont); +} + +char +column_type_alignment(Oid ftype) +{ + char align; + + switch (ftype) + { + case INT2OID: + case INT4OID: + case INT8OID: + case FLOAT4OID: + case FLOAT8OID: + case NUMERICOID: + case OIDOID: + case XIDOID: + case XID8OID: + case CIDOID: + case CASHOID: + align = 'r'; + break; + default: + align = 'l'; + break; + } + return align; +} + +void +setDecimalLocale(void) +{ + struct lconv *extlconv; + + extlconv = localeconv(); + + /* Don't accept an empty decimal_point string */ + if (*extlconv->decimal_point) + decimal_point = pg_strdup(extlconv->decimal_point); + else + decimal_point = "."; /* SQL output standard */ + + /* + * Although the Open Group standard allows locales to supply more than one + * group width, we consider only the first one, and we ignore any attempt + * to suppress grouping by specifying CHAR_MAX. As in the backend's + * cash.c, we must apply a range check to avoid being fooled by variant + * CHAR_MAX values. + */ + groupdigits = *extlconv->grouping; + if (groupdigits <= 0 || groupdigits > 6) + groupdigits = 3; /* most common */ + + /* Don't accept an empty thousands_sep string, either */ + /* similar code exists in formatting.c */ + if (*extlconv->thousands_sep) + thousands_sep = pg_strdup(extlconv->thousands_sep); + /* Make sure thousands separator doesn't match decimal point symbol. */ + else if (strcmp(decimal_point, ",") != 0) + thousands_sep = ","; + else + thousands_sep = "."; +} + +/* get selected or default line style */ +const printTextFormat * +get_line_style(const printTableOpt *opt) +{ + /* + * Note: this function mainly exists to preserve the convention that a + * printTableOpt struct can be initialized to zeroes to get default + * behavior. + */ + if (opt->line_style != NULL) + return opt->line_style; + else + return &pg_asciiformat; +} + +void +refresh_utf8format(const printTableOpt *opt) +{ + printTextFormat *popt = &pg_utf8format; + + const unicodeStyleBorderFormat *border; + const unicodeStyleRowFormat *header; + const unicodeStyleColumnFormat *column; + + popt->name = "unicode"; + + border = &unicode_style.border_style[opt->unicode_border_linestyle]; + header = &unicode_style.row_style[opt->unicode_header_linestyle]; + column = &unicode_style.column_style[opt->unicode_column_linestyle]; + + popt->lrule[PRINT_RULE_TOP].hrule = border->horizontal; + popt->lrule[PRINT_RULE_TOP].leftvrule = border->down_and_right; + popt->lrule[PRINT_RULE_TOP].midvrule = column->down_and_horizontal[opt->unicode_border_linestyle]; + popt->lrule[PRINT_RULE_TOP].rightvrule = border->down_and_left; + + popt->lrule[PRINT_RULE_MIDDLE].hrule = header->horizontal; + popt->lrule[PRINT_RULE_MIDDLE].leftvrule = header->vertical_and_right[opt->unicode_border_linestyle]; + popt->lrule[PRINT_RULE_MIDDLE].midvrule = column->vertical_and_horizontal[opt->unicode_header_linestyle]; + popt->lrule[PRINT_RULE_MIDDLE].rightvrule = header->vertical_and_left[opt->unicode_border_linestyle]; + + popt->lrule[PRINT_RULE_BOTTOM].hrule = border->horizontal; + popt->lrule[PRINT_RULE_BOTTOM].leftvrule = border->up_and_right; + popt->lrule[PRINT_RULE_BOTTOM].midvrule = column->up_and_horizontal[opt->unicode_border_linestyle]; + popt->lrule[PRINT_RULE_BOTTOM].rightvrule = border->left_and_right; + + /* N/A */ + popt->lrule[PRINT_RULE_DATA].hrule = ""; + popt->lrule[PRINT_RULE_DATA].leftvrule = border->vertical; + popt->lrule[PRINT_RULE_DATA].midvrule = column->vertical; + popt->lrule[PRINT_RULE_DATA].rightvrule = border->vertical; + + popt->midvrule_nl = column->vertical; + popt->midvrule_wrap = column->vertical; + popt->midvrule_blank = column->vertical; + + /* Same for all unicode today */ + popt->header_nl_left = unicode_style.header_nl_left; + popt->header_nl_right = unicode_style.header_nl_right; + popt->nl_left = unicode_style.nl_left; + popt->nl_right = unicode_style.nl_right; + popt->wrap_left = unicode_style.wrap_left; + popt->wrap_right = unicode_style.wrap_right; + popt->wrap_right_border = unicode_style.wrap_right_border; +} + +/* + * Compute the byte distance to the end of the string or *target_width + * display character positions, whichever comes first. Update *target_width + * to be the number of display character positions actually filled. + */ +static int +strlen_max_width(unsigned char *str, int *target_width, int encoding) +{ + unsigned char *start = str; + unsigned char *end = str + strlen((char *) str); + int curr_width = 0; + + while (str < end) + { + int char_width = PQdsplen((char *) str, encoding); + + /* + * If the display width of the new character causes the string to + * exceed its target width, skip it and return. However, if this is + * the first character of the string (curr_width == 0), we have to + * accept it. + */ + if (*target_width < curr_width + char_width && curr_width != 0) + break; + + curr_width += char_width; + + str += PQmblen((char *) str, encoding); + + if (str > end) /* Don't overrun invalid string */ + str = end; + } + + *target_width = curr_width; + + return str - start; +} diff --git a/src/fe_utils/psqlscan.c b/src/fe_utils/psqlscan.c new file mode 100644 index 0000000..eb8baf6 --- /dev/null +++ b/src/fe_utils/psqlscan.c @@ -0,0 +1,4996 @@ +#line 2 "psqlscan.c" +/*------------------------------------------------------------------------- + * + * psqlscan.l + * lexical scanner for SQL commands + * + * This lexer used to be part of psql, and that heritage is reflected in + * the file name as well as function and typedef names, though it can now + * be used by other frontend programs as well. It's also possible to extend + * this lexer with a compatible add-on lexer to handle program-specific + * backslash commands. + * + * This code is mainly concerned with determining where the end of a SQL + * statement is: we are looking for semicolons that are not within quotes, + * comments, or parentheses. The most reliable way to handle this is to + * borrow the backend's flex lexer rules, lock, stock, and barrel. The rules + * below are (except for a few) the same as the backend's, but their actions + * are just ECHO whereas the backend's actions generally do other things. + * + * XXX The rules in this file must be kept in sync with the backend lexer!!! + * + * XXX Avoid creating backtracking cases --- see the backend lexer for info. + * + * See psqlscan_int.h for additional commentary. + * + * + * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * IDENTIFICATION + * src/fe_utils/psqlscan.l + * + *------------------------------------------------------------------------- + */ +#include "postgres_fe.h" + +#include "common/logging.h" +#include "fe_utils/psqlscan.h" + +#include "libpq-fe.h" + +#line 43 "psqlscan.c" + +#define YY_INT_ALIGNED short int + +/* A lexical scanner generated by flex */ + +#define FLEX_SCANNER +#define YY_FLEX_MAJOR_VERSION 2 +#define YY_FLEX_MINOR_VERSION 6 +#define YY_FLEX_SUBMINOR_VERSION 4 +#if YY_FLEX_SUBMINOR_VERSION > 0 +#define FLEX_BETA +#endif + +#ifdef yy_create_buffer +#define psql_yy_create_buffer_ALREADY_DEFINED +#else +#define yy_create_buffer psql_yy_create_buffer +#endif + +#ifdef yy_delete_buffer +#define psql_yy_delete_buffer_ALREADY_DEFINED +#else +#define yy_delete_buffer psql_yy_delete_buffer +#endif + +#ifdef yy_scan_buffer +#define psql_yy_scan_buffer_ALREADY_DEFINED +#else +#define yy_scan_buffer psql_yy_scan_buffer +#endif + +#ifdef yy_scan_string +#define psql_yy_scan_string_ALREADY_DEFINED +#else +#define yy_scan_string psql_yy_scan_string +#endif + +#ifdef yy_scan_bytes +#define psql_yy_scan_bytes_ALREADY_DEFINED +#else +#define yy_scan_bytes psql_yy_scan_bytes +#endif + +#ifdef yy_init_buffer +#define psql_yy_init_buffer_ALREADY_DEFINED +#else +#define yy_init_buffer psql_yy_init_buffer +#endif + +#ifdef yy_flush_buffer +#define psql_yy_flush_buffer_ALREADY_DEFINED +#else +#define yy_flush_buffer psql_yy_flush_buffer +#endif + +#ifdef yy_load_buffer_state +#define psql_yy_load_buffer_state_ALREADY_DEFINED +#else +#define yy_load_buffer_state psql_yy_load_buffer_state +#endif + +#ifdef yy_switch_to_buffer +#define psql_yy_switch_to_buffer_ALREADY_DEFINED +#else +#define yy_switch_to_buffer psql_yy_switch_to_buffer +#endif + +#ifdef yypush_buffer_state +#define psql_yypush_buffer_state_ALREADY_DEFINED +#else +#define yypush_buffer_state psql_yypush_buffer_state +#endif + +#ifdef yypop_buffer_state +#define psql_yypop_buffer_state_ALREADY_DEFINED +#else +#define yypop_buffer_state psql_yypop_buffer_state +#endif + +#ifdef yyensure_buffer_stack +#define psql_yyensure_buffer_stack_ALREADY_DEFINED +#else +#define yyensure_buffer_stack psql_yyensure_buffer_stack +#endif + +#ifdef yylex +#define psql_yylex_ALREADY_DEFINED +#else +#define yylex psql_yylex +#endif + +#ifdef yyrestart +#define psql_yyrestart_ALREADY_DEFINED +#else +#define yyrestart psql_yyrestart +#endif + +#ifdef yylex_init +#define psql_yylex_init_ALREADY_DEFINED +#else +#define yylex_init psql_yylex_init +#endif + +#ifdef yylex_init_extra +#define psql_yylex_init_extra_ALREADY_DEFINED +#else +#define yylex_init_extra psql_yylex_init_extra +#endif + +#ifdef yylex_destroy +#define psql_yylex_destroy_ALREADY_DEFINED +#else +#define yylex_destroy psql_yylex_destroy +#endif + +#ifdef yyget_debug +#define psql_yyget_debug_ALREADY_DEFINED +#else +#define yyget_debug psql_yyget_debug +#endif + +#ifdef yyset_debug +#define psql_yyset_debug_ALREADY_DEFINED +#else +#define yyset_debug psql_yyset_debug +#endif + +#ifdef yyget_extra +#define psql_yyget_extra_ALREADY_DEFINED +#else +#define yyget_extra psql_yyget_extra +#endif + +#ifdef yyset_extra +#define psql_yyset_extra_ALREADY_DEFINED +#else +#define yyset_extra psql_yyset_extra +#endif + +#ifdef yyget_in +#define psql_yyget_in_ALREADY_DEFINED +#else +#define yyget_in psql_yyget_in +#endif + +#ifdef yyset_in +#define psql_yyset_in_ALREADY_DEFINED +#else +#define yyset_in psql_yyset_in +#endif + +#ifdef yyget_out +#define psql_yyget_out_ALREADY_DEFINED +#else +#define yyget_out psql_yyget_out +#endif + +#ifdef yyset_out +#define psql_yyset_out_ALREADY_DEFINED +#else +#define yyset_out psql_yyset_out +#endif + +#ifdef yyget_leng +#define psql_yyget_leng_ALREADY_DEFINED +#else +#define yyget_leng psql_yyget_leng +#endif + +#ifdef yyget_text +#define psql_yyget_text_ALREADY_DEFINED +#else +#define yyget_text psql_yyget_text +#endif + +#ifdef yyget_lineno +#define psql_yyget_lineno_ALREADY_DEFINED +#else +#define yyget_lineno psql_yyget_lineno +#endif + +#ifdef yyset_lineno +#define psql_yyset_lineno_ALREADY_DEFINED +#else +#define yyset_lineno psql_yyset_lineno +#endif + +#ifdef yyget_column +#define psql_yyget_column_ALREADY_DEFINED +#else +#define yyget_column psql_yyget_column +#endif + +#ifdef yyset_column +#define psql_yyset_column_ALREADY_DEFINED +#else +#define yyset_column psql_yyset_column +#endif + +#ifdef yywrap +#define psql_yywrap_ALREADY_DEFINED +#else +#define yywrap psql_yywrap +#endif + +#ifdef yyget_lval +#define psql_yyget_lval_ALREADY_DEFINED +#else +#define yyget_lval psql_yyget_lval +#endif + +#ifdef yyset_lval +#define psql_yyset_lval_ALREADY_DEFINED +#else +#define yyset_lval psql_yyset_lval +#endif + +#ifdef yyalloc +#define psql_yyalloc_ALREADY_DEFINED +#else +#define yyalloc psql_yyalloc +#endif + +#ifdef yyrealloc +#define psql_yyrealloc_ALREADY_DEFINED +#else +#define yyrealloc psql_yyrealloc +#endif + +#ifdef yyfree +#define psql_yyfree_ALREADY_DEFINED +#else +#define yyfree psql_yyfree +#endif + +/* First, we deal with platform-specific or compiler-specific issues. */ + +/* begin standard C headers. */ +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <stdlib.h> + +/* end standard C headers. */ + +/* flex integer type definitions */ + +#ifndef FLEXINT_H +#define FLEXINT_H + +/* C99 systems have <inttypes.h>. Non-C99 systems may or may not. */ + +#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L + +/* C99 says to define __STDC_LIMIT_MACROS before including stdint.h, + * if you want the limit (max/min) macros for int types. + */ +#ifndef __STDC_LIMIT_MACROS +#define __STDC_LIMIT_MACROS 1 +#endif + +#include <inttypes.h> +typedef int8_t flex_int8_t; +typedef uint8_t flex_uint8_t; +typedef int16_t flex_int16_t; +typedef uint16_t flex_uint16_t; +typedef int32_t flex_int32_t; +typedef uint32_t flex_uint32_t; +#else +typedef signed char flex_int8_t; +typedef short int flex_int16_t; +typedef int flex_int32_t; +typedef unsigned char flex_uint8_t; +typedef unsigned short int flex_uint16_t; +typedef unsigned int flex_uint32_t; + +/* Limits of integral types. */ +#ifndef INT8_MIN +#define INT8_MIN (-128) +#endif +#ifndef INT16_MIN +#define INT16_MIN (-32767-1) +#endif +#ifndef INT32_MIN +#define INT32_MIN (-2147483647-1) +#endif +#ifndef INT8_MAX +#define INT8_MAX (127) +#endif +#ifndef INT16_MAX +#define INT16_MAX (32767) +#endif +#ifndef INT32_MAX +#define INT32_MAX (2147483647) +#endif +#ifndef UINT8_MAX +#define UINT8_MAX (255U) +#endif +#ifndef UINT16_MAX +#define UINT16_MAX (65535U) +#endif +#ifndef UINT32_MAX +#define UINT32_MAX (4294967295U) +#endif + +#ifndef SIZE_MAX +#define SIZE_MAX (~(size_t)0) +#endif + +#endif /* ! C99 */ + +#endif /* ! FLEXINT_H */ + +/* begin standard C++ headers. */ + +/* TODO: this is always defined, so inline it */ +#define yyconst const + +#if defined(__GNUC__) && __GNUC__ >= 3 +#define yynoreturn __attribute__((__noreturn__)) +#else +#define yynoreturn +#endif + +/* Returned upon end-of-file. */ +#define YY_NULL 0 + +/* Promotes a possibly negative, possibly signed char to an + * integer in range [0..255] for use as an array index. + */ +#define YY_SC_TO_UI(c) ((YY_CHAR) (c)) + +/* An opaque pointer. */ +#ifndef YY_TYPEDEF_YY_SCANNER_T +#define YY_TYPEDEF_YY_SCANNER_T +typedef void* yyscan_t; +#endif + +/* For convenience, these vars (plus the bison vars far below) + are macros in the reentrant scanner. */ +#define yyin yyg->yyin_r +#define yyout yyg->yyout_r +#define yyextra yyg->yyextra_r +#define yyleng yyg->yyleng_r +#define yytext yyg->yytext_r +#define yylineno (YY_CURRENT_BUFFER_LVALUE->yy_bs_lineno) +#define yycolumn (YY_CURRENT_BUFFER_LVALUE->yy_bs_column) +#define yy_flex_debug yyg->yy_flex_debug_r + +/* Enter a start condition. This macro really ought to take a parameter, + * but we do it the disgusting crufty way forced on us by the ()-less + * definition of BEGIN. + */ +#define BEGIN yyg->yy_start = 1 + 2 * +/* Translate the current start state into a value that can be later handed + * to BEGIN to return to the state. The YYSTATE alias is for lex + * compatibility. + */ +#define YY_START ((yyg->yy_start - 1) / 2) +#define YYSTATE YY_START +/* Action number for EOF rule of a given start state. */ +#define YY_STATE_EOF(state) (YY_END_OF_BUFFER + state + 1) +/* Special action meaning "start processing a new file". */ +#define YY_NEW_FILE yyrestart( yyin , yyscanner ) +#define YY_END_OF_BUFFER_CHAR 0 + +/* Size of default input buffer. */ +#ifndef YY_BUF_SIZE +#ifdef __ia64__ +/* On IA-64, the buffer size is 16k, not 8k. + * Moreover, YY_BUF_SIZE is 2*YY_READ_BUF_SIZE in the general case. + * Ditto for the __ia64__ case accordingly. + */ +#define YY_BUF_SIZE 32768 +#else +#define YY_BUF_SIZE 16384 +#endif /* __ia64__ */ +#endif + +/* The state buf must be large enough to hold one state per character in the main buffer. + */ +#define YY_STATE_BUF_SIZE ((YY_BUF_SIZE + 2) * sizeof(yy_state_type)) + +#ifndef YY_TYPEDEF_YY_BUFFER_STATE +#define YY_TYPEDEF_YY_BUFFER_STATE +typedef struct yy_buffer_state *YY_BUFFER_STATE; +#endif + +#ifndef YY_TYPEDEF_YY_SIZE_T +#define YY_TYPEDEF_YY_SIZE_T +typedef size_t yy_size_t; +#endif + +#define EOB_ACT_CONTINUE_SCAN 0 +#define EOB_ACT_END_OF_FILE 1 +#define EOB_ACT_LAST_MATCH 2 + + #define YY_LESS_LINENO(n) + #define YY_LINENO_REWIND_TO(ptr) + +/* Return all but the first "n" matched characters back to the input stream. */ +#define yyless(n) \ + do \ + { \ + /* Undo effects of setting up yytext. */ \ + int yyless_macro_arg = (n); \ + YY_LESS_LINENO(yyless_macro_arg);\ + *yy_cp = yyg->yy_hold_char; \ + YY_RESTORE_YY_MORE_OFFSET \ + yyg->yy_c_buf_p = yy_cp = yy_bp + yyless_macro_arg - YY_MORE_ADJ; \ + YY_DO_BEFORE_ACTION; /* set up yytext again */ \ + } \ + while ( 0 ) +#define unput(c) yyunput( c, yyg->yytext_ptr , yyscanner ) + +#ifndef YY_STRUCT_YY_BUFFER_STATE +#define YY_STRUCT_YY_BUFFER_STATE +struct yy_buffer_state + { + FILE *yy_input_file; + + char *yy_ch_buf; /* input buffer */ + char *yy_buf_pos; /* current position in input buffer */ + + /* Size of input buffer in bytes, not including room for EOB + * characters. + */ + int yy_buf_size; + + /* Number of characters read into yy_ch_buf, not including EOB + * characters. + */ + int yy_n_chars; + + /* Whether we "own" the buffer - i.e., we know we created it, + * and can realloc() it to grow it, and should free() it to + * delete it. + */ + int yy_is_our_buffer; + + /* Whether this is an "interactive" input source; if so, and + * if we're using stdio for input, then we want to use getc() + * instead of fread(), to make sure we stop fetching input after + * each newline. + */ + int yy_is_interactive; + + /* Whether we're considered to be at the beginning of a line. + * If so, '^' rules will be active on the next match, otherwise + * not. + */ + int yy_at_bol; + + int yy_bs_lineno; /**< The line count. */ + int yy_bs_column; /**< The column count. */ + + /* Whether to try to fill the input buffer when we reach the + * end of it. + */ + int yy_fill_buffer; + + int yy_buffer_status; + +#define YY_BUFFER_NEW 0 +#define YY_BUFFER_NORMAL 1 + /* When an EOF's been seen but there's still some text to process + * then we mark the buffer as YY_EOF_PENDING, to indicate that we + * shouldn't try reading from the input source any more. We might + * still have a bunch of tokens to match, though, because of + * possible backing-up. + * + * When we actually see the EOF, we change the status to "new" + * (via yyrestart()), so that the user can continue scanning by + * just pointing yyin at a new input file. + */ +#define YY_BUFFER_EOF_PENDING 2 + + }; +#endif /* !YY_STRUCT_YY_BUFFER_STATE */ + +/* We provide macros for accessing buffer states in case in the + * future we want to put the buffer states in a more general + * "scanner state". + * + * Returns the top of the stack, or NULL. + */ +#define YY_CURRENT_BUFFER ( yyg->yy_buffer_stack \ + ? yyg->yy_buffer_stack[yyg->yy_buffer_stack_top] \ + : NULL) +/* Same as previous macro, but useful when we know that the buffer stack is not + * NULL or when we need an lvalue. For internal use only. + */ +#define YY_CURRENT_BUFFER_LVALUE yyg->yy_buffer_stack[yyg->yy_buffer_stack_top] + +void yyrestart ( FILE *input_file , yyscan_t yyscanner ); +void yy_switch_to_buffer ( YY_BUFFER_STATE new_buffer , yyscan_t yyscanner ); +YY_BUFFER_STATE yy_create_buffer ( FILE *file, int size , yyscan_t yyscanner ); +void yy_delete_buffer ( YY_BUFFER_STATE b , yyscan_t yyscanner ); +void yy_flush_buffer ( YY_BUFFER_STATE b , yyscan_t yyscanner ); +void yypush_buffer_state ( YY_BUFFER_STATE new_buffer , yyscan_t yyscanner ); +void yypop_buffer_state ( yyscan_t yyscanner ); + +static void yyensure_buffer_stack ( yyscan_t yyscanner ); +static void yy_load_buffer_state ( yyscan_t yyscanner ); +static void yy_init_buffer ( YY_BUFFER_STATE b, FILE *file , yyscan_t yyscanner ); +#define YY_FLUSH_BUFFER yy_flush_buffer( YY_CURRENT_BUFFER , yyscanner) + +YY_BUFFER_STATE yy_scan_buffer ( char *base, yy_size_t size , yyscan_t yyscanner ); +YY_BUFFER_STATE yy_scan_string ( const char *yy_str , yyscan_t yyscanner ); +YY_BUFFER_STATE yy_scan_bytes ( const char *bytes, int len , yyscan_t yyscanner ); + +void *yyalloc ( yy_size_t , yyscan_t yyscanner ); +void *yyrealloc ( void *, yy_size_t , yyscan_t yyscanner ); +void yyfree ( void * , yyscan_t yyscanner ); + +#define yy_new_buffer yy_create_buffer +#define yy_set_interactive(is_interactive) \ + { \ + if ( ! YY_CURRENT_BUFFER ){ \ + yyensure_buffer_stack (yyscanner); \ + YY_CURRENT_BUFFER_LVALUE = \ + yy_create_buffer( yyin, YY_BUF_SIZE , yyscanner); \ + } \ + YY_CURRENT_BUFFER_LVALUE->yy_is_interactive = is_interactive; \ + } +#define yy_set_bol(at_bol) \ + { \ + if ( ! YY_CURRENT_BUFFER ){\ + yyensure_buffer_stack (yyscanner); \ + YY_CURRENT_BUFFER_LVALUE = \ + yy_create_buffer( yyin, YY_BUF_SIZE , yyscanner); \ + } \ + YY_CURRENT_BUFFER_LVALUE->yy_at_bol = at_bol; \ + } +#define YY_AT_BOL() (YY_CURRENT_BUFFER_LVALUE->yy_at_bol) + +/* Begin user sect3 */ + +#define psql_yywrap(yyscanner) (/*CONSTCOND*/1) +#define YY_SKIP_YYWRAP +typedef flex_uint8_t YY_CHAR; + +typedef int yy_state_type; + +#define yytext_ptr yytext_r + +static const flex_int16_t yy_nxt[][40] = + { + { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 + }, + + { + 23, 24, 25, 26, 25, 27, 28, 29, 30, 31, + 29, 32, 33, 34, 31, 31, 35, 36, 37, 38, + 39, 39, 40, 41, 42, 43, 44, 29, 45, 46, + 47, 45, 48, 49, 50, 51, 49, 50, 24, 24 + }, + + { + 23, 24, 25, 26, 25, 27, 28, 29, 30, 31, + 29, 32, 33, 34, 31, 31, 35, 36, 37, 38, + + 39, 39, 40, 41, 42, 43, 44, 29, 45, 46, + 47, 45, 48, 49, 50, 51, 49, 50, 24, 24 + }, 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-169, -169, -169, -169, -169, 171, 171, + 171, -169, -169, -169, -169, -169, -169, -169, -169, -169 + + }, + + { + 23, -170, -170, -170, -170, -170, -170, -170, -170, -170, + -170, -170, -170, -170, -170, -170, -170, -170, -170, -170, + 172, 172, -170, -170, -170, -170, -170, -170, 172, 172, + 172, -170, -170, -170, -170, -170, -170, -170, -170, -170 + }, + + { + 23, -171, -171, -171, -171, -171, -171, -171, -171, -171, + -171, -171, -171, -171, -171, -171, -171, -171, -171, -171, + 173, 173, -171, -171, -171, -171, -171, -171, 173, 173, + 173, -171, -171, -171, -171, -171, -171, -171, -171, -171 + }, + + { + 23, -172, -172, -172, -172, -172, -172, -172, -172, -172, + -172, -172, -172, -172, -172, -172, -172, -172, -172, -172, + + -172, -172, -172, -172, -172, -172, -172, -172, -172, -172, + -172, -172, -172, -172, -172, -172, -172, -172, -172, -172 + }, + + { + 23, -173, -173, -173, -173, -173, -173, -173, -173, -173, + -173, -173, -173, -173, -173, -173, -173, -173, -173, -173, + 174, 174, -173, -173, -173, -173, -173, -173, 174, 174, + 174, -173, -173, -173, -173, -173, -173, -173, -173, -173 + }, + + { + 23, -174, -174, -174, -174, -174, -174, -174, -174, -174, + -174, -174, -174, -174, -174, -174, -174, -174, -174, -174, + 175, 175, -174, -174, -174, -174, -174, -174, 175, 175, + 175, -174, -174, -174, -174, -174, -174, -174, -174, -174 + + }, + + { + 23, -175, -175, -175, -175, -175, -175, -175, -175, -175, + -175, -175, -175, -175, -175, -175, -175, -175, -175, -175, + 172, 172, -175, -175, -175, -175, -175, -175, 172, 172, + 172, -175, -175, -175, -175, -175, -175, -175, -175, -175 + }, + + } ; + +static yy_state_type yy_get_previous_state ( yyscan_t yyscanner ); +static yy_state_type yy_try_NUL_trans ( yy_state_type current_state , yyscan_t yyscanner); +static int yy_get_next_buffer ( yyscan_t yyscanner ); +static void yynoreturn yy_fatal_error ( const char* msg , yyscan_t yyscanner ); + +/* Done after the current pattern has been matched and before the + * corresponding action - sets up yytext. + */ +#define YY_DO_BEFORE_ACTION \ + yyg->yytext_ptr = yy_bp; \ + yyleng = (int) (yy_cp - yy_bp); \ + yyg->yy_hold_char = *yy_cp; \ + *yy_cp = '\0'; \ + yyg->yy_c_buf_p = yy_cp; +#define YY_NUM_RULES 74 +#define YY_END_OF_BUFFER 75 +/* This struct is not used in this scanner, + but its presence is necessary. */ +struct yy_trans_info + { + flex_int32_t yy_verify; + flex_int32_t yy_nxt; + }; +static const flex_int16_t yy_accept[176] = + { 0, + 0, 0, 10, 10, 0, 0, 0, 0, 9, 9, + 0, 0, 18, 18, 0, 0, 0, 0, 0, 0, + 0, 0, 75, 73, 1, 1, 64, 35, 64, 73, + 63, 13, 50, 51, 63, 63, 63, 63, 66, 63, + 52, 63, 63, 63, 72, 72, 72, 72, 72, 72, + 54, 10, 16, 5, 5, 6, 6, 40, 37, 9, + 21, 16, 19, 18, 18, 18, 18, 22, 22, 16, + 28, 32, 32, 34, 38, 1, 64, 49, 29, 65, + 30, 1, 43, 67, 2, 67, 66, 70, 60, 59, + 55, 42, 44, 62, 46, 48, 45, 47, 72, 8, + + 14, 12, 41, 11, 53, 10, 5, 7, 4, 3, + 40, 39, 9, 21, 20, 18, 18, 18, 18, 17, + 18, 18, 22, 25, 26, 24, 24, 25, 32, 31, + 33, 30, 1, 1, 2, 68, 67, 71, 69, 60, + 59, 61, 36, 15, 3, 18, 18, 18, 18, 26, + 24, 24, 27, 33, 57, 56, 61, 18, 18, 18, + 18, 18, 26, 24, 24, 27, 58, 18, 24, 24, + 24, 23, 24, 24, 24 + } ; + +static const YY_CHAR yy_ec[256] = + { 0, + 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, + 1, 2, 4, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 2, 5, 6, 7, 8, 9, 10, 11, 12, + 13, 14, 15, 16, 17, 18, 19, 20, 20, 20, + 20, 20, 20, 20, 20, 21, 21, 22, 23, 24, + 25, 26, 27, 7, 28, 29, 28, 28, 30, 28, + 31, 31, 31, 31, 31, 31, 31, 32, 31, 31, + 31, 31, 31, 31, 33, 31, 31, 34, 31, 31, + 16, 35, 16, 9, 31, 7, 28, 29, 28, 28, + + 30, 28, 31, 31, 31, 31, 31, 31, 31, 32, + 31, 31, 31, 31, 31, 31, 36, 31, 31, 37, + 31, 31, 38, 7, 39, 7, 1, 31, 31, 31, + 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, + 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, + 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, + 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, + 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, + 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, + 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, + + 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, + 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, + 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, + 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, + 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, + 31, 31, 31, 31, 31 + } ; + +/* The intent behind this definition is that it'll catch + * any uses of REJECT which flex missed. + */ +#define REJECT reject_used_but_not_detected +#define yymore() yymore_used_but_not_detected +#define YY_MORE_ADJ 0 +#define YY_RESTORE_YY_MORE_OFFSET +#line 1 "psqlscan.l" + +#line 44 "psqlscan.l" + +/* LCOV_EXCL_START */ + +#include "fe_utils/psqlscan_int.h" + +/* + * We must have a typedef YYSTYPE for yylex's first argument, but this lexer + * doesn't presently make use of that argument, so just declare it as int. + */ +typedef int YYSTYPE; + +/* + * Set the type of yyextra; we use it as a pointer back to the containing + * PsqlScanState. + */ +#define YY_EXTRA_TYPE PsqlScanState + + +/* Return values from yylex() */ +#define LEXRES_EOL 0 /* end of input */ +#define LEXRES_SEMI 1 /* command-terminating semicolon found */ +#define LEXRES_BACKSLASH 2 /* backslash command start */ + + +#define ECHO psqlscan_emit(cur_state, yytext, yyleng) + +/* + * Work around a bug in flex 2.5.35: it emits a couple of functions that + * it forgets to emit declarations for. Since we use -Wmissing-prototypes, + * this would cause warnings. Providing our own declarations should be + * harmless even when the bug gets fixed. + */ +extern int psql_yyget_column(yyscan_t yyscanner); +extern void psql_yyset_column(int column_no, yyscan_t yyscanner); + +#line 2019 "psqlscan.c" +#define YY_NO_INPUT 1 +/* + * All of the following definitions and rules should exactly match + * src/backend/parser/scan.l so far as the flex patterns are concerned. + * The rule bodies are just ECHO as opposed to what the backend does, + * however. (But be sure to duplicate code that affects the lexing process, + * such as BEGIN() and yyless().) Also, psqlscan uses a single <<EOF>> rule + * whereas scan.l has a separate one for each exclusive state. + */ +/* + * OK, here is a short description of lex/flex rules behavior. + * The longest pattern which matches an input string is always chosen. + * For equal-length patterns, the first occurring in the rules list is chosen. + * INITIAL is the starting state, to which all non-conditional rules apply. + * Exclusive states change parsing rules while the state is active. When in + * an exclusive state, only those rules defined for that state apply. + * + * We use exclusive states for quoted strings, extended comments, + * and to eliminate parsing troubles for numeric strings. + * Exclusive states: + * <xb> bit string literal + * <xc> extended C-style comments + * <xd> delimited identifiers (double-quoted identifiers) + * <xh> hexadecimal numeric string + * <xq> standard quoted strings + * <xqs> quote stop (detect continued strings) + * <xe> extended quoted strings (support backslash escape sequences) + * <xdolq> $foo$ quoted strings + * <xui> quoted identifier with Unicode escapes + * <xus> quoted string with Unicode escapes + * + * Note: we intentionally don't mimic the backend's <xeu> state; we have + * no need to distinguish it from <xe> state, and no good way to get out + * of it in error cases. The backend just throws yyerror() in those + * cases, but that's not an option here. + */ + +/* + * In order to make the world safe for Windows and Mac clients as well as + * Unix ones, we accept either \n or \r as a newline. A DOS-style \r\n + * sequence will be seen as two successive newlines, but that doesn't cause + * any problems. Comments that start with -- and extend to the next + * newline are treated as equivalent to a single whitespace character. + * + * NOTE a fine point: if there is no newline following --, we will absorb + * everything to the end of the input as a comment. This is correct. Older + * versions of Postgres failed to recognize -- as a comment if the input + * did not end with a newline. + * + * XXX perhaps \f (formfeed) should be treated as a newline as well? + * + * XXX if you change the set of whitespace characters, fix scanner_isspace() + * to agree. + */ +/* + * SQL requires at least one newline in the whitespace separating + * string literals that are to be concatenated. Silly, but who are we + * to argue? Note that {whitespace_with_newline} should not have * after + * it, whereas {whitespace} should generally have a * after it... + */ +/* If we see {quote} then {quotecontinue}, the quoted string continues */ +/* + * {quotecontinuefail} is needed to avoid lexer backup when we fail to match + * {quotecontinue}. It might seem that this could just be {whitespace}*, + * but if there's a dash after {whitespace_with_newline}, it must be consumed + * to see if there's another dash --- which would start a {comment} and thus + * allow continuation of the {quotecontinue} token. + */ +/* Bit string + * It is tempting to scan the string for only those characters + * which are allowed. However, this leads to silently swallowed + * characters if illegal characters are included in the string. + * For example, if xbinside is [01] then B'ABCD' is interpreted + * as a zero-length string, and the ABCD' is lost! + * Better to pass the string forward and let the input routines + * validate the contents. + */ +/* Hexadecimal number */ +/* National character */ +/* Quoted string that allows backslash escapes */ +/* Extended quote + * xqdouble implements embedded quote, '''' + */ +/* $foo$ style quotes ("dollar quoting") + * The quoted string starts with $foo$ where "foo" is an optional string + * in the form of an identifier, except that it may not contain "$", + * and extends to the first occurrence of an identical string. + * There is *no* processing of the quoted text. + * + * {dolqfailed} is an error rule to avoid scanner backup when {dolqdelim} + * fails to match its trailing "$". + */ +/* Double quote + * Allows embedded spaces and other special characters into identifiers. + */ +/* Quoted identifier with Unicode escapes */ +/* Quoted string with Unicode escapes */ +/* error rule to avoid backup */ +/* C-style comments + * + * The "extended comment" syntax closely resembles allowable operator syntax. + * The tricky part here is to get lex to recognize a string starting with + * slash-star as a comment, when interpreting it as an operator would produce + * a longer match --- remember lex will prefer a longer match! Also, if we + * have something like plus-slash-star, lex will think this is a 3-character + * operator whereas we want to see it as a + operator and a comment start. + * The solution is two-fold: + * 1. append {op_chars}* to xcstart so that it matches as much text as + * {operator} would. Then the tie-breaker (first matching rule of same + * length) ensures xcstart wins. We put back the extra stuff with yyless() + * in case it contains a star-slash that should terminate the comment. + * 2. In the operator rule, check for slash-star within the operator, and + * if found throw it back with yyless(). This handles the plus-slash-star + * problem. + * Dash-dash comments have similar interactions with the operator rule. + */ +/* Assorted special-case operators and operator-like tokens */ +/* + * These operator-like tokens (unlike the above ones) also match the {operator} + * rule, which means that they might be overridden by a longer match if they + * are followed by a comment start or a + or - character. Accordingly, if you + * add to this list, you must also add corresponding code to the {operator} + * block to return the correct token in such cases. (This is not needed in + * psqlscan.l since the token value is ignored there.) + */ +/* + * "self" is the set of chars that should be returned as single-character + * tokens. "op_chars" is the set of chars that can make up "Op" tokens, + * which can be one or more characters long (but if a single-char token + * appears in the "self" set, it is not to be returned as an Op). Note + * that the sets overlap, but each has some chars that are not in the other. + * + * If you change either set, adjust the character lists appearing in the + * rule for "operator"! + */ +/* we no longer allow unary minus in numbers. + * instead we pass it separately to parser. there it gets + * coerced via doNegate() -- Leon aug 20 1999 + * + * {decimalfail} is used because we would like "1..10" to lex as 1, dot_dot, 10. + * + * {realfail1} and {realfail2} are added to prevent the need for scanner + * backup when the {real} rule fails to match completely. + */ +/* psql-specific: characters allowed in variable names */ +/* + * Dollar quoted strings are totally opaque, and no escaping is done on them. + * Other quoted strings must allow some special characters such as single-quote + * and newline. + * Embedded single-quotes are implemented both in the SQL standard + * style of two adjacent single quotes "''" and in the Postgres/Java style + * of escaped-quote "\'". + * Other embedded escaped characters are matched explicitly and the leading + * backslash is dropped from the string. + * Note that xcstart must appear before operator, as explained above! + * Also whitespace (comment) must appear before operator. + */ +#line 2177 "psqlscan.c" + +#define INITIAL 0 +#define xb 1 +#define xc 2 +#define xd 3 +#define xh 4 +#define xq 5 +#define xqs 6 +#define xe 7 +#define xdolq 8 +#define xui 9 +#define xus 10 + +#ifndef YY_NO_UNISTD_H +/* Special case for "unistd.h", since it is non-ANSI. We include it way + * down here because we want the user's section 1 to have been scanned first. + * The user has a chance to override it with an option. + */ +#include <unistd.h> +#endif + +#ifndef YY_EXTRA_TYPE +#define YY_EXTRA_TYPE void * +#endif + +/* Holds the entire state of the reentrant scanner. */ +struct yyguts_t + { + + /* User-defined. Not touched by flex. */ + YY_EXTRA_TYPE yyextra_r; + + /* The rest are the same as the globals declared in the non-reentrant scanner. */ + FILE *yyin_r, *yyout_r; + size_t yy_buffer_stack_top; /**< index of top of stack. */ + size_t yy_buffer_stack_max; /**< capacity of stack. */ + YY_BUFFER_STATE * yy_buffer_stack; /**< Stack as an array. */ + char yy_hold_char; + int yy_n_chars; + int yyleng_r; + char *yy_c_buf_p; + int yy_init; + int yy_start; + int yy_did_buffer_switch_on_eof; + int yy_start_stack_ptr; + int yy_start_stack_depth; + int *yy_start_stack; + yy_state_type yy_last_accepting_state; + char* yy_last_accepting_cpos; + + int yylineno_r; + int yy_flex_debug_r; + + char *yytext_r; + int yy_more_flag; + int yy_more_len; + + YYSTYPE * yylval_r; + + }; /* end struct yyguts_t */ + +static int yy_init_globals ( yyscan_t yyscanner ); + + /* This must go here because YYSTYPE and YYLTYPE are included + * from bison output in section 1.*/ + # define yylval yyg->yylval_r + +int yylex_init (yyscan_t* scanner); + +int yylex_init_extra ( YY_EXTRA_TYPE user_defined, yyscan_t* scanner); + +/* Accessor methods to globals. + These are made visible to non-reentrant scanners for convenience. */ + +int yylex_destroy ( yyscan_t yyscanner ); + +int yyget_debug ( yyscan_t yyscanner ); + +void yyset_debug ( int debug_flag , yyscan_t yyscanner ); + +YY_EXTRA_TYPE yyget_extra ( yyscan_t yyscanner ); + +void yyset_extra ( YY_EXTRA_TYPE user_defined , yyscan_t yyscanner ); + +FILE *yyget_in ( yyscan_t yyscanner ); + +void yyset_in ( FILE * _in_str , yyscan_t yyscanner ); + +FILE *yyget_out ( yyscan_t yyscanner ); + +void yyset_out ( FILE * _out_str , yyscan_t yyscanner ); + + int yyget_leng ( yyscan_t yyscanner ); + +char *yyget_text ( yyscan_t yyscanner ); + +int yyget_lineno ( yyscan_t yyscanner ); + +void yyset_lineno ( int _line_number , yyscan_t yyscanner ); + +int yyget_column ( yyscan_t yyscanner ); + +void yyset_column ( int _column_no , yyscan_t yyscanner ); + +YYSTYPE * yyget_lval ( yyscan_t yyscanner ); + +void yyset_lval ( YYSTYPE * yylval_param , yyscan_t yyscanner ); + +/* Macros after this point can all be overridden by user definitions in + * section 1. + */ + +#ifndef YY_SKIP_YYWRAP +#ifdef __cplusplus +extern "C" int yywrap ( yyscan_t yyscanner ); +#else +extern int yywrap ( yyscan_t yyscanner ); +#endif +#endif + +#ifndef YY_NO_UNPUT + +#endif + +#ifndef yytext_ptr +static void yy_flex_strncpy ( char *, const char *, int , yyscan_t yyscanner); +#endif + +#ifdef YY_NEED_STRLEN +static int yy_flex_strlen ( const char * , yyscan_t yyscanner); +#endif + +#ifndef YY_NO_INPUT +#ifdef __cplusplus +static int yyinput ( yyscan_t yyscanner ); +#else +static int input ( yyscan_t yyscanner ); +#endif + +#endif + +/* Amount of stuff to slurp up with each read. */ +#ifndef YY_READ_BUF_SIZE +#ifdef __ia64__ +/* On IA-64, the buffer size is 16k, not 8k */ +#define YY_READ_BUF_SIZE 16384 +#else +#define YY_READ_BUF_SIZE 8192 +#endif /* __ia64__ */ +#endif + +/* Copy whatever the last rule matched to the standard output. */ +#ifndef ECHO +/* This used to be an fputs(), but since the string might contain NUL's, + * we now use fwrite(). + */ +#define ECHO do { if (fwrite( yytext, (size_t) yyleng, 1, yyout )) {} } while (0) +#endif + +/* Gets input and stuffs it into "buf". number of characters read, or YY_NULL, + * is returned in "result". + */ +#ifndef YY_INPUT +#define YY_INPUT(buf,result,max_size) \ + if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \ + { \ + int c = '*'; \ + int n; \ + for ( n = 0; n < max_size && \ + (c = getc( yyin )) != EOF && c != '\n'; ++n ) \ + buf[n] = (char) c; \ + if ( c == '\n' ) \ + buf[n++] = (char) c; \ + if ( c == EOF && ferror( yyin ) ) \ + YY_FATAL_ERROR( "input in flex scanner failed" ); \ + result = n; \ + } \ + else \ + { \ + errno=0; \ + while ( (result = (int) fread(buf, 1, (yy_size_t) max_size, yyin)) == 0 && ferror(yyin)) \ + { \ + if( errno != EINTR) \ + { \ + YY_FATAL_ERROR( "input in flex scanner failed" ); \ + break; \ + } \ + errno=0; \ + clearerr(yyin); \ + } \ + }\ +\ + +#endif + +/* No semi-colon after return; correct usage is to write "yyterminate();" - + * we don't want an extra ';' after the "return" because that will cause + * some compilers to complain about unreachable statements. + */ +#ifndef yyterminate +#define yyterminate() return YY_NULL +#endif + +/* Number of entries by which start-condition stack grows. */ +#ifndef YY_START_STACK_INCR +#define YY_START_STACK_INCR 25 +#endif + +/* Report a fatal error. */ +#ifndef YY_FATAL_ERROR +#define YY_FATAL_ERROR(msg) yy_fatal_error( msg , yyscanner) +#endif + +/* end tables serialization structures and prototypes */ + +/* Default declaration of generated scanner - a define so the user can + * easily add parameters. + */ +#ifndef YY_DECL +#define YY_DECL_IS_OURS 1 + +extern int yylex \ + (YYSTYPE * yylval_param , yyscan_t yyscanner); + +#define YY_DECL int yylex \ + (YYSTYPE * yylval_param , yyscan_t yyscanner) +#endif /* !YY_DECL */ + +/* Code executed at the beginning of each rule, after yytext and yyleng + * have been set up. + */ +#ifndef YY_USER_ACTION +#define YY_USER_ACTION +#endif + +/* Code executed at the end of each rule. */ +#ifndef YY_BREAK +#define YY_BREAK /*LINTED*/break; +#endif + +#define YY_RULE_SETUP \ + YY_USER_ACTION + +/** The main scanner function which does all the work. + */ +YY_DECL +{ + yy_state_type yy_current_state; + char *yy_cp, *yy_bp; + int yy_act; + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + yylval = yylval_param; + + if ( !yyg->yy_init ) + { + yyg->yy_init = 1; + +#ifdef YY_USER_INIT + YY_USER_INIT; +#endif + + if ( ! yyg->yy_start ) + yyg->yy_start = 1; /* first start state */ + + if ( ! yyin ) + yyin = stdin; + + if ( ! yyout ) + yyout = stdout; + + if ( ! YY_CURRENT_BUFFER ) { + yyensure_buffer_stack (yyscanner); + YY_CURRENT_BUFFER_LVALUE = + yy_create_buffer( yyin, YY_BUF_SIZE , yyscanner); + } + + yy_load_buffer_state( yyscanner ); + } + + { +#line 358 "psqlscan.l" + + + +#line 362 "psqlscan.l" + /* Declare some local variables inside yylex(), for convenience */ + PsqlScanState cur_state = yyextra; + PQExpBuffer output_buf = cur_state->output_buf; + + /* + * Force flex into the state indicated by start_state. This has a + * couple of purposes: it lets some of the functions below set a new + * starting state without ugly direct access to flex variables, and it + * allows us to transition from one flex lexer to another so that we + * can lex different parts of the source string using separate lexers. + */ + BEGIN(cur_state->start_state); + + +#line 2478 "psqlscan.c" + + while ( /*CONSTCOND*/1 ) /* loops until end-of-file is reached */ + { + yy_cp = yyg->yy_c_buf_p; + + /* Support of yytext. */ + *yy_cp = yyg->yy_hold_char; + + /* yy_bp points to the position in yy_ch_buf of the start of + * the current run. + */ + yy_bp = yy_cp; + + yy_current_state = yyg->yy_start; +yy_match: + while ( (yy_current_state = yy_nxt[yy_current_state][ yy_ec[YY_SC_TO_UI(*yy_cp)] ]) > 0 ) + ++yy_cp; + + yy_current_state = -yy_current_state; + +yy_find_action: + yy_act = yy_accept[yy_current_state]; + + YY_DO_BEFORE_ACTION; + +do_action: /* This label is used only to access EOF actions. */ + + switch ( yy_act ) + { /* beginning of action switch */ +case 1: +/* rule 1 can match eol */ +YY_RULE_SETUP +#line 376 "psqlscan.l" +{ + /* + * Note that the whitespace rule includes both true + * whitespace and single-line ("--" style) comments. + * We suppress whitespace at the start of the query + * buffer. We also suppress all single-line comments, + * which is pretty dubious but is the historical + * behavior. + */ + if (!(output_buf->len == 0 || yytext[0] == '-')) + ECHO; + } + YY_BREAK +case 2: +YY_RULE_SETUP +#line 389 "psqlscan.l" +{ + cur_state->xcdepth = 0; + BEGIN(xc); + /* Put back any characters past slash-star; see above */ + yyless(2); + ECHO; + } + YY_BREAK + +case 3: +YY_RULE_SETUP +#line 398 "psqlscan.l" +{ + cur_state->xcdepth++; + /* Put back any characters past slash-star; see above */ + yyless(2); + ECHO; + } + YY_BREAK +case 4: +YY_RULE_SETUP +#line 405 "psqlscan.l" +{ + if (cur_state->xcdepth <= 0) + BEGIN(INITIAL); + else + cur_state->xcdepth--; + ECHO; + } + YY_BREAK +case 5: +/* rule 5 can match eol */ +YY_RULE_SETUP +#line 413 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 6: +YY_RULE_SETUP +#line 417 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 7: +YY_RULE_SETUP +#line 421 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +/* <xc> */ +case 8: +YY_RULE_SETUP +#line 426 "psqlscan.l" +{ + BEGIN(xb); + ECHO; + } + YY_BREAK +case 9: +/* rule 9 can match eol */ +#line 431 "psqlscan.l" +case 10: +/* rule 10 can match eol */ +YY_RULE_SETUP +#line 431 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 11: +YY_RULE_SETUP +#line 435 "psqlscan.l" +{ + /* Hexadecimal bit type. + * At some point we should simply pass the string + * forward to the parser and label it there. + * In the meantime, place a leading "x" on the string + * to mark it for the input routine as a hex string. + */ + BEGIN(xh); + ECHO; + } + YY_BREAK +case 12: +YY_RULE_SETUP +#line 446 "psqlscan.l" +{ + yyless(1); /* eat only 'n' this time */ + ECHO; + } + YY_BREAK +case 13: +YY_RULE_SETUP +#line 451 "psqlscan.l" +{ + if (cur_state->std_strings) + BEGIN(xq); + else + BEGIN(xe); + ECHO; + } + YY_BREAK +case 14: +YY_RULE_SETUP +#line 458 "psqlscan.l" +{ + BEGIN(xe); + ECHO; + } + YY_BREAK +case 15: +YY_RULE_SETUP +#line 462 "psqlscan.l" +{ + BEGIN(xus); + ECHO; + } + YY_BREAK +case 16: +YY_RULE_SETUP +#line 467 "psqlscan.l" +{ + /* + * When we are scanning a quoted string and see an end + * quote, we must look ahead for a possible continuation. + * If we don't see one, we know the end quote was in fact + * the end of the string. To reduce the lexer table size, + * we use a single "xqs" state to do the lookahead for all + * types of strings. + */ + cur_state->state_before_str_stop = YYSTATE; + BEGIN(xqs); + ECHO; + } + YY_BREAK +case 17: +/* rule 17 can match eol */ +YY_RULE_SETUP +#line 480 "psqlscan.l" +{ + /* + * Found a quote continuation, so return to the in-quote + * state and continue scanning the literal. Nothing is + * added to the literal's contents. + */ + BEGIN(cur_state->state_before_str_stop); + ECHO; + } + YY_BREAK +case 18: +/* rule 18 can match eol */ +#line 490 "psqlscan.l" +case 19: +/* rule 19 can match eol */ +YY_RULE_SETUP +#line 490 "psqlscan.l" +{ + /* + * Failed to see a quote continuation. Throw back + * everything after the end quote, and handle the string + * according to the state we were in previously. + */ + yyless(0); + BEGIN(INITIAL); + /* There's nothing to echo ... */ + } + YY_BREAK +case 20: +YY_RULE_SETUP +#line 501 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 21: +/* rule 21 can match eol */ +YY_RULE_SETUP +#line 504 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 22: +/* rule 22 can match eol */ +YY_RULE_SETUP +#line 507 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 23: +YY_RULE_SETUP +#line 510 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 24: +YY_RULE_SETUP +#line 513 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 25: +/* rule 25 can match eol */ +YY_RULE_SETUP +#line 516 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 26: +YY_RULE_SETUP +#line 519 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 27: +YY_RULE_SETUP +#line 522 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 28: +YY_RULE_SETUP +#line 525 "psqlscan.l" +{ + /* This is only needed for \ just before EOF */ + ECHO; + } + YY_BREAK +case 29: +YY_RULE_SETUP +#line 530 "psqlscan.l" +{ + cur_state->dolqstart = pg_strdup(yytext); + BEGIN(xdolq); + ECHO; + } + YY_BREAK +case 30: +YY_RULE_SETUP +#line 535 "psqlscan.l" +{ + /* throw back all but the initial "$" */ + yyless(1); + ECHO; + } + YY_BREAK +case 31: +YY_RULE_SETUP +#line 540 "psqlscan.l" +{ + if (strcmp(yytext, cur_state->dolqstart) == 0) + { + free(cur_state->dolqstart); + cur_state->dolqstart = NULL; + BEGIN(INITIAL); + } + else + { + /* + * When we fail to match $...$ to dolqstart, transfer + * the $... part to the output, but put back the final + * $ for rescanning. Consider $delim$...$junk$delim$ + */ + yyless(yyleng - 1); + } + ECHO; + } + YY_BREAK +case 32: +/* rule 32 can match eol */ +YY_RULE_SETUP +#line 558 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 33: +YY_RULE_SETUP +#line 561 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 34: +YY_RULE_SETUP +#line 564 "psqlscan.l" +{ + /* This is only needed for $ inside the quoted text */ + ECHO; + } + YY_BREAK +case 35: +YY_RULE_SETUP +#line 569 "psqlscan.l" +{ + BEGIN(xd); + ECHO; + } + YY_BREAK +case 36: +YY_RULE_SETUP +#line 573 "psqlscan.l" +{ + BEGIN(xui); + ECHO; + } + YY_BREAK +case 37: +YY_RULE_SETUP +#line 577 "psqlscan.l" +{ + BEGIN(INITIAL); + ECHO; + } + YY_BREAK +case 38: +YY_RULE_SETUP +#line 581 "psqlscan.l" +{ + BEGIN(INITIAL); + ECHO; + } + YY_BREAK +case 39: +YY_RULE_SETUP +#line 585 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 40: +/* rule 40 can match eol */ +YY_RULE_SETUP +#line 588 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 41: +YY_RULE_SETUP +#line 592 "psqlscan.l" +{ + /* throw back all but the initial u/U */ + yyless(1); + ECHO; + } + YY_BREAK +case 42: +YY_RULE_SETUP +#line 598 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 43: +YY_RULE_SETUP +#line 602 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 44: +YY_RULE_SETUP +#line 606 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 45: +YY_RULE_SETUP +#line 610 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 46: +YY_RULE_SETUP +#line 614 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 47: +YY_RULE_SETUP +#line 618 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 48: +YY_RULE_SETUP +#line 622 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 49: +YY_RULE_SETUP +#line 626 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +/* + * These rules are specific to psql --- they implement parenthesis + * counting and detection of command-ending semicolon. These must + * appear before the {self} rule so that they take precedence over it. + */ +case 50: +YY_RULE_SETUP +#line 636 "psqlscan.l" +{ + cur_state->paren_depth++; + ECHO; + } + YY_BREAK +case 51: +YY_RULE_SETUP +#line 641 "psqlscan.l" +{ + if (cur_state->paren_depth > 0) + cur_state->paren_depth--; + ECHO; + } + YY_BREAK +case 52: +YY_RULE_SETUP +#line 647 "psqlscan.l" +{ + ECHO; + if (cur_state->paren_depth == 0) + { + /* Terminate lexing temporarily */ + cur_state->start_state = YY_START; + return LEXRES_SEMI; + } + } + YY_BREAK +/* + * psql-specific rules to handle backslash commands and variable + * substitution. We want these before {self}, also. + */ +case 53: +YY_RULE_SETUP +#line 662 "psqlscan.l" +{ + /* Force a semi-colon or colon into the query buffer */ + psqlscan_emit(cur_state, yytext + 1, 1); + } + YY_BREAK +case 54: +YY_RULE_SETUP +#line 667 "psqlscan.l" +{ + /* Terminate lexing temporarily */ + cur_state->start_state = YY_START; + return LEXRES_BACKSLASH; + } + YY_BREAK +case 55: +YY_RULE_SETUP +#line 673 "psqlscan.l" +{ + /* Possible psql variable substitution */ + char *varname; + char *value; + + varname = psqlscan_extract_substring(cur_state, + yytext + 1, + yyleng - 1); + if (cur_state->callbacks->get_variable) + value = cur_state->callbacks->get_variable(varname, + PQUOTE_PLAIN, + cur_state->cb_passthrough); + else + value = NULL; + + if (value) + { + /* It is a variable, check for recursion */ + if (psqlscan_var_is_current_source(cur_state, varname)) + { + /* Recursive expansion --- don't go there */ + pg_log_warning("skipping recursive expansion of variable \"%s\"", + varname); + /* Instead copy the string as is */ + ECHO; + } + else + { + /* OK, perform substitution */ + psqlscan_push_new_buffer(cur_state, value, varname); + /* yy_scan_string already made buffer active */ + } + free(value); + } + else + { + /* + * if the variable doesn't exist we'll copy the string + * as is + */ + ECHO; + } + + free(varname); + } + YY_BREAK +case 56: +YY_RULE_SETUP +#line 719 "psqlscan.l" +{ + psqlscan_escape_variable(cur_state, yytext, yyleng, + PQUOTE_SQL_LITERAL); + } + YY_BREAK +case 57: +YY_RULE_SETUP +#line 724 "psqlscan.l" +{ + psqlscan_escape_variable(cur_state, yytext, yyleng, + PQUOTE_SQL_IDENT); + } + YY_BREAK +case 58: +YY_RULE_SETUP +#line 729 "psqlscan.l" +{ + psqlscan_test_variable(cur_state, yytext, yyleng); + } + YY_BREAK +/* + * These rules just avoid the need for scanner backup if one of the + * three rules above fails to match completely. + */ +case 59: +YY_RULE_SETUP +#line 738 "psqlscan.l" +{ + /* Throw back everything but the colon */ + yyless(1); + ECHO; + } + YY_BREAK +case 60: +YY_RULE_SETUP +#line 744 "psqlscan.l" +{ + /* Throw back everything but the colon */ + yyless(1); + ECHO; + } + YY_BREAK +case 61: +YY_RULE_SETUP +#line 750 "psqlscan.l" +{ + /* Throw back everything but the colon */ + yyless(1); + ECHO; + } + YY_BREAK +case 62: +YY_RULE_SETUP +#line 755 "psqlscan.l" +{ + /* Throw back everything but the colon */ + yyless(1); + ECHO; + } + YY_BREAK +/* + * Back to backend-compatible rules. + */ +case 63: +YY_RULE_SETUP +#line 765 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 64: +YY_RULE_SETUP +#line 769 "psqlscan.l" +{ + /* + * Check for embedded slash-star or dash-dash; those + * are comment starts, so operator must stop there. + * Note that slash-star or dash-dash at the first + * character will match a prior rule, not this one. + */ + int nchars = yyleng; + char *slashstar = strstr(yytext, "/*"); + char *dashdash = strstr(yytext, "--"); + + if (slashstar && dashdash) + { + /* if both appear, take the first one */ + if (slashstar > dashdash) + slashstar = dashdash; + } + else if (!slashstar) + slashstar = dashdash; + if (slashstar) + nchars = slashstar - yytext; + + /* + * For SQL compatibility, '+' and '-' cannot be the + * last char of a multi-char operator unless the operator + * contains chars that are not in SQL operators. + * The idea is to lex '=-' as two operators, but not + * to forbid operator names like '?-' that could not be + * sequences of SQL operators. + */ + if (nchars > 1 && + (yytext[nchars - 1] == '+' || + yytext[nchars - 1] == '-')) + { + int ic; + + for (ic = nchars - 2; ic >= 0; ic--) + { + char c = yytext[ic]; + if (c == '~' || c == '!' || c == '@' || + c == '#' || c == '^' || c == '&' || + c == '|' || c == '`' || c == '?' || + c == '%') + break; + } + if (ic < 0) + { + /* + * didn't find a qualifying character, so remove + * all trailing [+-] + */ + do { + nchars--; + } while (nchars > 1 && + (yytext[nchars - 1] == '+' || + yytext[nchars - 1] == '-')); + } + } + + if (nchars < yyleng) + { + /* Strip the unwanted chars from the token */ + yyless(nchars); + } + ECHO; + } + YY_BREAK +case 65: +YY_RULE_SETUP +#line 836 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 66: +YY_RULE_SETUP +#line 840 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 67: +YY_RULE_SETUP +#line 843 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 68: +YY_RULE_SETUP +#line 846 "psqlscan.l" +{ + /* throw back the .., and treat as integer */ + yyless(yyleng - 2); + ECHO; + } + YY_BREAK +case 69: +YY_RULE_SETUP +#line 851 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 70: +YY_RULE_SETUP +#line 854 "psqlscan.l" +{ + /* + * throw back the [Ee], and figure out whether what + * remains is an {integer} or {decimal}. + * (in psql, we don't actually care...) + */ + yyless(yyleng - 1); + ECHO; + } + YY_BREAK +case 71: +YY_RULE_SETUP +#line 863 "psqlscan.l" +{ + /* throw back the [Ee][+-], and proceed as above */ + yyless(yyleng - 2); + ECHO; + } + YY_BREAK +case 72: +YY_RULE_SETUP +#line 870 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case 73: +YY_RULE_SETUP +#line 874 "psqlscan.l" +{ + ECHO; + } + YY_BREAK +case YY_STATE_EOF(INITIAL): +case YY_STATE_EOF(xb): +case YY_STATE_EOF(xc): +case YY_STATE_EOF(xd): +case YY_STATE_EOF(xh): +case YY_STATE_EOF(xq): +case YY_STATE_EOF(xqs): +case YY_STATE_EOF(xe): +case YY_STATE_EOF(xdolq): +case YY_STATE_EOF(xui): +case YY_STATE_EOF(xus): +#line 878 "psqlscan.l" +{ + if (cur_state->buffer_stack == NULL) + { + cur_state->start_state = YY_START; + return LEXRES_EOL; /* end of input reached */ + } + + /* + * We were expanding a variable, so pop the inclusion + * stack and keep lexing + */ + psqlscan_pop_buffer_stack(cur_state); + psqlscan_select_top_buffer(cur_state); + } + YY_BREAK +case 74: +YY_RULE_SETUP +#line 893 "psqlscan.l" +YY_FATAL_ERROR( "flex scanner jammed" ); + YY_BREAK +#line 3293 "psqlscan.c" + + case YY_END_OF_BUFFER: + { + /* Amount of text matched not including the EOB char. */ + int yy_amount_of_matched_text = (int) (yy_cp - yyg->yytext_ptr) - 1; + + /* Undo the effects of YY_DO_BEFORE_ACTION. */ + *yy_cp = yyg->yy_hold_char; + YY_RESTORE_YY_MORE_OFFSET + + if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_NEW ) + { + /* We're scanning a new file or input source. It's + * possible that this happened because the user + * just pointed yyin at a new source and called + * yylex(). If so, then we have to assure + * consistency between YY_CURRENT_BUFFER and our + * globals. Here is the right place to do so, because + * this is the first action (other than possibly a + * back-up) that will match for the new input source. + */ + yyg->yy_n_chars = YY_CURRENT_BUFFER_LVALUE->yy_n_chars; + YY_CURRENT_BUFFER_LVALUE->yy_input_file = yyin; + YY_CURRENT_BUFFER_LVALUE->yy_buffer_status = YY_BUFFER_NORMAL; + } + + /* Note that here we test for yy_c_buf_p "<=" to the position + * of the first EOB in the buffer, since yy_c_buf_p will + * already have been incremented past the NUL character + * (since all states make transitions on EOB to the + * end-of-buffer state). Contrast this with the test + * in input(). + */ + if ( yyg->yy_c_buf_p <= &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars] ) + { /* This was really a NUL. */ + yy_state_type yy_next_state; + + yyg->yy_c_buf_p = yyg->yytext_ptr + yy_amount_of_matched_text; + + yy_current_state = yy_get_previous_state( yyscanner ); + + /* Okay, we're now positioned to make the NUL + * transition. We couldn't have + * yy_get_previous_state() go ahead and do it + * for us because it doesn't know how to deal + * with the possibility of jamming (and we don't + * want to build jamming into it because then it + * will run more slowly). + */ + + yy_next_state = yy_try_NUL_trans( yy_current_state , yyscanner); + + yy_bp = yyg->yytext_ptr + YY_MORE_ADJ; + + if ( yy_next_state ) + { + /* Consume the NUL. */ + yy_cp = ++yyg->yy_c_buf_p; + yy_current_state = yy_next_state; + goto yy_match; + } + + else + { + yy_cp = yyg->yy_c_buf_p; + goto yy_find_action; + } + } + + else switch ( yy_get_next_buffer( yyscanner ) ) + { + case EOB_ACT_END_OF_FILE: + { + yyg->yy_did_buffer_switch_on_eof = 0; + + if ( yywrap( yyscanner ) ) + { + /* Note: because we've taken care in + * yy_get_next_buffer() to have set up + * yytext, we can now set up + * yy_c_buf_p so that if some total + * hoser (like flex itself) wants to + * call the scanner after we return the + * YY_NULL, it'll still work - another + * YY_NULL will get returned. + */ + yyg->yy_c_buf_p = yyg->yytext_ptr + YY_MORE_ADJ; + + yy_act = YY_STATE_EOF(YY_START); + goto do_action; + } + + else + { + if ( ! yyg->yy_did_buffer_switch_on_eof ) + YY_NEW_FILE; + } + break; + } + + case EOB_ACT_CONTINUE_SCAN: + yyg->yy_c_buf_p = + yyg->yytext_ptr + yy_amount_of_matched_text; + + yy_current_state = yy_get_previous_state( yyscanner ); + + yy_cp = yyg->yy_c_buf_p; + yy_bp = yyg->yytext_ptr + YY_MORE_ADJ; + goto yy_match; + + case EOB_ACT_LAST_MATCH: + yyg->yy_c_buf_p = + &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars]; + + yy_current_state = yy_get_previous_state( yyscanner ); + + yy_cp = yyg->yy_c_buf_p; + yy_bp = yyg->yytext_ptr + YY_MORE_ADJ; + goto yy_find_action; + } + break; + } + + default: + YY_FATAL_ERROR( + "fatal flex scanner internal error--no action found" ); + } /* end of action switch */ + } /* end of scanning one token */ + } /* end of user's declarations */ +} /* end of yylex */ + +/* yy_get_next_buffer - try to read in a new buffer + * + * Returns a code representing an action: + * EOB_ACT_LAST_MATCH - + * EOB_ACT_CONTINUE_SCAN - continue scanning from current position + * EOB_ACT_END_OF_FILE - end of file + */ +static int yy_get_next_buffer (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + char *dest = YY_CURRENT_BUFFER_LVALUE->yy_ch_buf; + char *source = yyg->yytext_ptr; + int number_to_move, i; + int ret_val; + + if ( yyg->yy_c_buf_p > &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars + 1] ) + YY_FATAL_ERROR( + "fatal flex scanner internal error--end of buffer missed" ); + + if ( YY_CURRENT_BUFFER_LVALUE->yy_fill_buffer == 0 ) + { /* Don't try to fill the buffer, so this is an EOF. */ + if ( yyg->yy_c_buf_p - yyg->yytext_ptr - YY_MORE_ADJ == 1 ) + { + /* We matched a single character, the EOB, so + * treat this as a final EOF. + */ + return EOB_ACT_END_OF_FILE; + } + + else + { + /* We matched some text prior to the EOB, first + * process it. + */ + return EOB_ACT_LAST_MATCH; + } + } + + /* Try to read more data. */ + + /* First move last chars to start of buffer. */ + number_to_move = (int) (yyg->yy_c_buf_p - yyg->yytext_ptr - 1); + + for ( i = 0; i < number_to_move; ++i ) + *(dest++) = *(source++); + + if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_EOF_PENDING ) + /* don't do the read, it's not guaranteed to return an EOF, + * just force an EOF + */ + YY_CURRENT_BUFFER_LVALUE->yy_n_chars = yyg->yy_n_chars = 0; + + else + { + int num_to_read = + YY_CURRENT_BUFFER_LVALUE->yy_buf_size - number_to_move - 1; + + while ( num_to_read <= 0 ) + { /* Not enough room in the buffer - grow it. */ + + /* just a shorter name for the current buffer */ + YY_BUFFER_STATE b = YY_CURRENT_BUFFER_LVALUE; + + int yy_c_buf_p_offset = + (int) (yyg->yy_c_buf_p - b->yy_ch_buf); + + if ( b->yy_is_our_buffer ) + { + int new_size = b->yy_buf_size * 2; + + if ( new_size <= 0 ) + b->yy_buf_size += b->yy_buf_size / 8; + else + b->yy_buf_size *= 2; + + b->yy_ch_buf = (char *) + /* Include room in for 2 EOB chars. */ + yyrealloc( (void *) b->yy_ch_buf, + (yy_size_t) (b->yy_buf_size + 2) , yyscanner ); + } + else + /* Can't grow it, we don't own it. */ + b->yy_ch_buf = NULL; + + if ( ! b->yy_ch_buf ) + YY_FATAL_ERROR( + "fatal error - scanner input buffer overflow" ); + + yyg->yy_c_buf_p = &b->yy_ch_buf[yy_c_buf_p_offset]; + + num_to_read = YY_CURRENT_BUFFER_LVALUE->yy_buf_size - + number_to_move - 1; + + } + + if ( num_to_read > YY_READ_BUF_SIZE ) + num_to_read = YY_READ_BUF_SIZE; + + /* Read in more data. */ + YY_INPUT( (&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[number_to_move]), + yyg->yy_n_chars, num_to_read ); + + YY_CURRENT_BUFFER_LVALUE->yy_n_chars = yyg->yy_n_chars; + } + + if ( yyg->yy_n_chars == 0 ) + { + if ( number_to_move == YY_MORE_ADJ ) + { + ret_val = EOB_ACT_END_OF_FILE; + yyrestart( yyin , yyscanner); + } + + else + { + ret_val = EOB_ACT_LAST_MATCH; + YY_CURRENT_BUFFER_LVALUE->yy_buffer_status = + YY_BUFFER_EOF_PENDING; + } + } + + else + ret_val = EOB_ACT_CONTINUE_SCAN; + + if ((yyg->yy_n_chars + number_to_move) > YY_CURRENT_BUFFER_LVALUE->yy_buf_size) { + /* Extend the array by 50%, plus the number we really need. */ + int new_size = yyg->yy_n_chars + number_to_move + (yyg->yy_n_chars >> 1); + YY_CURRENT_BUFFER_LVALUE->yy_ch_buf = (char *) yyrealloc( + (void *) YY_CURRENT_BUFFER_LVALUE->yy_ch_buf, (yy_size_t) new_size , yyscanner ); + if ( ! YY_CURRENT_BUFFER_LVALUE->yy_ch_buf ) + YY_FATAL_ERROR( "out of dynamic memory in yy_get_next_buffer()" ); + /* "- 2" to take care of EOB's */ + YY_CURRENT_BUFFER_LVALUE->yy_buf_size = (int) (new_size - 2); + } + + yyg->yy_n_chars += number_to_move; + YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars] = YY_END_OF_BUFFER_CHAR; + YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars + 1] = YY_END_OF_BUFFER_CHAR; + + yyg->yytext_ptr = &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[0]; + + return ret_val; +} + +/* yy_get_previous_state - get the state just before the EOB char was reached */ + + static yy_state_type yy_get_previous_state (yyscan_t yyscanner) +{ + yy_state_type yy_current_state; + char *yy_cp; + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + yy_current_state = yyg->yy_start; + + for ( yy_cp = yyg->yytext_ptr + YY_MORE_ADJ; yy_cp < yyg->yy_c_buf_p; ++yy_cp ) + { + yy_current_state = yy_nxt[yy_current_state][(*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : 1)]; + } + + return yy_current_state; +} + +/* yy_try_NUL_trans - try to make a transition on the NUL character + * + * synopsis + * next_state = yy_try_NUL_trans( current_state ); + */ + static yy_state_type yy_try_NUL_trans (yy_state_type yy_current_state , yyscan_t yyscanner) +{ + int yy_is_jam; + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; /* This var may be unused depending upon options. */ + + yy_current_state = yy_nxt[yy_current_state][1]; + yy_is_jam = (yy_current_state <= 0); + + (void)yyg; + return yy_is_jam ? 0 : yy_current_state; +} + +#ifndef YY_NO_UNPUT + +#endif + +#ifndef YY_NO_INPUT +#ifdef __cplusplus + static int yyinput (yyscan_t yyscanner) +#else + static int input (yyscan_t yyscanner) +#endif + +{ + int c; + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + *yyg->yy_c_buf_p = yyg->yy_hold_char; + + if ( *yyg->yy_c_buf_p == YY_END_OF_BUFFER_CHAR ) + { + /* yy_c_buf_p now points to the character we want to return. + * If this occurs *before* the EOB characters, then it's a + * valid NUL; if not, then we've hit the end of the buffer. + */ + if ( yyg->yy_c_buf_p < &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars] ) + /* This was really a NUL. */ + *yyg->yy_c_buf_p = '\0'; + + else + { /* need more input */ + int offset = (int) (yyg->yy_c_buf_p - yyg->yytext_ptr); + ++yyg->yy_c_buf_p; + + switch ( yy_get_next_buffer( yyscanner ) ) + { + case EOB_ACT_LAST_MATCH: + /* This happens because yy_g_n_b() + * sees that we've accumulated a + * token and flags that we need to + * try matching the token before + * proceeding. But for input(), + * there's no matching to consider. + * So convert the EOB_ACT_LAST_MATCH + * to EOB_ACT_END_OF_FILE. + */ + + /* Reset buffer status. */ + yyrestart( yyin , yyscanner); + + /*FALLTHROUGH*/ + + case EOB_ACT_END_OF_FILE: + { + if ( yywrap( yyscanner ) ) + return 0; + + if ( ! yyg->yy_did_buffer_switch_on_eof ) + YY_NEW_FILE; +#ifdef __cplusplus + return yyinput(yyscanner); +#else + return input(yyscanner); +#endif + } + + case EOB_ACT_CONTINUE_SCAN: + yyg->yy_c_buf_p = yyg->yytext_ptr + offset; + break; + } + } + } + + c = *(unsigned char *) yyg->yy_c_buf_p; /* cast for 8-bit char's */ + *yyg->yy_c_buf_p = '\0'; /* preserve yytext */ + yyg->yy_hold_char = *++yyg->yy_c_buf_p; + + return c; +} +#endif /* ifndef YY_NO_INPUT */ + +/** Immediately switch to a different input stream. + * @param input_file A readable stream. + * @param yyscanner The scanner object. + * @note This function does not reset the start condition to @c INITIAL . + */ + void yyrestart (FILE * input_file , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + if ( ! YY_CURRENT_BUFFER ){ + yyensure_buffer_stack (yyscanner); + YY_CURRENT_BUFFER_LVALUE = + yy_create_buffer( yyin, YY_BUF_SIZE , yyscanner); + } + + yy_init_buffer( YY_CURRENT_BUFFER, input_file , yyscanner); + yy_load_buffer_state( yyscanner ); +} + +/** Switch to a different input buffer. + * @param new_buffer The new input buffer. + * @param yyscanner The scanner object. + */ + void yy_switch_to_buffer (YY_BUFFER_STATE new_buffer , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + /* TODO. We should be able to replace this entire function body + * with + * yypop_buffer_state(); + * yypush_buffer_state(new_buffer); + */ + yyensure_buffer_stack (yyscanner); + if ( YY_CURRENT_BUFFER == new_buffer ) + return; + + if ( YY_CURRENT_BUFFER ) + { + /* Flush out information for old buffer. */ + *yyg->yy_c_buf_p = yyg->yy_hold_char; + YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = yyg->yy_c_buf_p; + YY_CURRENT_BUFFER_LVALUE->yy_n_chars = yyg->yy_n_chars; + } + + YY_CURRENT_BUFFER_LVALUE = new_buffer; + yy_load_buffer_state( yyscanner ); + + /* We don't actually know whether we did this switch during + * EOF (yywrap()) processing, but the only time this flag + * is looked at is after yywrap() is called, so it's safe + * to go ahead and always set it. + */ + yyg->yy_did_buffer_switch_on_eof = 1; +} + +static void yy_load_buffer_state (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + yyg->yy_n_chars = YY_CURRENT_BUFFER_LVALUE->yy_n_chars; + yyg->yytext_ptr = yyg->yy_c_buf_p = YY_CURRENT_BUFFER_LVALUE->yy_buf_pos; + yyin = YY_CURRENT_BUFFER_LVALUE->yy_input_file; + yyg->yy_hold_char = *yyg->yy_c_buf_p; +} + +/** Allocate and initialize an input buffer state. + * @param file A readable stream. + * @param size The character buffer size in bytes. When in doubt, use @c YY_BUF_SIZE. + * @param yyscanner The scanner object. + * @return the allocated buffer state. + */ + YY_BUFFER_STATE yy_create_buffer (FILE * file, int size , yyscan_t yyscanner) +{ + YY_BUFFER_STATE b; + + b = (YY_BUFFER_STATE) yyalloc( sizeof( struct yy_buffer_state ) , yyscanner ); + if ( ! b ) + YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" ); + + b->yy_buf_size = size; + + /* yy_ch_buf has to be 2 characters longer than the size given because + * we need to put in 2 end-of-buffer characters. + */ + b->yy_ch_buf = (char *) yyalloc( (yy_size_t) (b->yy_buf_size + 2) , yyscanner ); + if ( ! b->yy_ch_buf ) + YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" ); + + b->yy_is_our_buffer = 1; + + yy_init_buffer( b, file , yyscanner); + + return b; +} + +/** Destroy the buffer. + * @param b a buffer created with yy_create_buffer() + * @param yyscanner The scanner object. + */ + void yy_delete_buffer (YY_BUFFER_STATE b , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + if ( ! b ) + return; + + if ( b == YY_CURRENT_BUFFER ) /* Not sure if we should pop here. */ + YY_CURRENT_BUFFER_LVALUE = (YY_BUFFER_STATE) 0; + + if ( b->yy_is_our_buffer ) + yyfree( (void *) b->yy_ch_buf , yyscanner ); + + yyfree( (void *) b , yyscanner ); +} + +/* Initializes or reinitializes a buffer. + * This function is sometimes called more than once on the same buffer, + * such as during a yyrestart() or at EOF. + */ + static void yy_init_buffer (YY_BUFFER_STATE b, FILE * file , yyscan_t yyscanner) + +{ + int oerrno = errno; + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + yy_flush_buffer( b , yyscanner); + + b->yy_input_file = file; + b->yy_fill_buffer = 1; + + /* If b is the current buffer, then yy_init_buffer was _probably_ + * called from yyrestart() or through yy_get_next_buffer. + * In that case, we don't want to reset the lineno or column. + */ + if (b != YY_CURRENT_BUFFER){ + b->yy_bs_lineno = 1; + b->yy_bs_column = 0; + } + + b->yy_is_interactive = 0; + + errno = oerrno; +} + +/** Discard all buffered characters. On the next scan, YY_INPUT will be called. + * @param b the buffer state to be flushed, usually @c YY_CURRENT_BUFFER. + * @param yyscanner The scanner object. + */ + void yy_flush_buffer (YY_BUFFER_STATE b , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + if ( ! b ) + return; + + b->yy_n_chars = 0; + + /* We always need two end-of-buffer characters. The first causes + * a transition to the end-of-buffer state. The second causes + * a jam in that state. + */ + b->yy_ch_buf[0] = YY_END_OF_BUFFER_CHAR; + b->yy_ch_buf[1] = YY_END_OF_BUFFER_CHAR; + + b->yy_buf_pos = &b->yy_ch_buf[0]; + + b->yy_at_bol = 1; + b->yy_buffer_status = YY_BUFFER_NEW; + + if ( b == YY_CURRENT_BUFFER ) + yy_load_buffer_state( yyscanner ); +} + +/** Pushes the new state onto the stack. The new state becomes + * the current state. This function will allocate the stack + * if necessary. + * @param new_buffer The new state. + * @param yyscanner The scanner object. + */ +void yypush_buffer_state (YY_BUFFER_STATE new_buffer , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + if (new_buffer == NULL) + return; + + yyensure_buffer_stack(yyscanner); + + /* This block is copied from yy_switch_to_buffer. */ + if ( YY_CURRENT_BUFFER ) + { + /* Flush out information for old buffer. */ + *yyg->yy_c_buf_p = yyg->yy_hold_char; + YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = yyg->yy_c_buf_p; + YY_CURRENT_BUFFER_LVALUE->yy_n_chars = yyg->yy_n_chars; + } + + /* Only push if top exists. Otherwise, replace top. */ + if (YY_CURRENT_BUFFER) + yyg->yy_buffer_stack_top++; + YY_CURRENT_BUFFER_LVALUE = new_buffer; + + /* copied from yy_switch_to_buffer. */ + yy_load_buffer_state( yyscanner ); + yyg->yy_did_buffer_switch_on_eof = 1; +} + +/** Removes and deletes the top of the stack, if present. + * The next element becomes the new top. + * @param yyscanner The scanner object. + */ +void yypop_buffer_state (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + if (!YY_CURRENT_BUFFER) + return; + + yy_delete_buffer(YY_CURRENT_BUFFER , yyscanner); + YY_CURRENT_BUFFER_LVALUE = NULL; + if (yyg->yy_buffer_stack_top > 0) + --yyg->yy_buffer_stack_top; + + if (YY_CURRENT_BUFFER) { + yy_load_buffer_state( yyscanner ); + yyg->yy_did_buffer_switch_on_eof = 1; + } +} + +/* Allocates the stack if it does not exist. + * Guarantees space for at least one push. + */ +static void yyensure_buffer_stack (yyscan_t yyscanner) +{ + yy_size_t num_to_alloc; + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + if (!yyg->yy_buffer_stack) { + + /* First allocation is just for 2 elements, since we don't know if this + * scanner will even need a stack. We use 2 instead of 1 to avoid an + * immediate realloc on the next call. + */ + num_to_alloc = 1; /* After all that talk, this was set to 1 anyways... */ + yyg->yy_buffer_stack = (struct yy_buffer_state**)yyalloc + (num_to_alloc * sizeof(struct yy_buffer_state*) + , yyscanner); + if ( ! yyg->yy_buffer_stack ) + YY_FATAL_ERROR( "out of dynamic memory in yyensure_buffer_stack()" ); + + memset(yyg->yy_buffer_stack, 0, num_to_alloc * sizeof(struct yy_buffer_state*)); + + yyg->yy_buffer_stack_max = num_to_alloc; + yyg->yy_buffer_stack_top = 0; + return; + } + + if (yyg->yy_buffer_stack_top >= (yyg->yy_buffer_stack_max) - 1){ + + /* Increase the buffer to prepare for a possible push. */ + yy_size_t grow_size = 8 /* arbitrary grow size */; + + num_to_alloc = yyg->yy_buffer_stack_max + grow_size; + yyg->yy_buffer_stack = (struct yy_buffer_state**)yyrealloc + (yyg->yy_buffer_stack, + num_to_alloc * sizeof(struct yy_buffer_state*) + , yyscanner); + if ( ! yyg->yy_buffer_stack ) + YY_FATAL_ERROR( "out of dynamic memory in yyensure_buffer_stack()" ); + + /* zero only the new slots.*/ + memset(yyg->yy_buffer_stack + yyg->yy_buffer_stack_max, 0, grow_size * sizeof(struct yy_buffer_state*)); + yyg->yy_buffer_stack_max = num_to_alloc; + } +} + +/** Setup the input buffer state to scan directly from a user-specified character buffer. + * @param base the character buffer + * @param size the size in bytes of the character buffer + * @param yyscanner The scanner object. + * @return the newly allocated buffer state object. + */ +YY_BUFFER_STATE yy_scan_buffer (char * base, yy_size_t size , yyscan_t yyscanner) +{ + YY_BUFFER_STATE b; + + if ( size < 2 || + base[size-2] != YY_END_OF_BUFFER_CHAR || + base[size-1] != YY_END_OF_BUFFER_CHAR ) + /* They forgot to leave room for the EOB's. */ + return NULL; + + b = (YY_BUFFER_STATE) yyalloc( sizeof( struct yy_buffer_state ) , yyscanner ); + if ( ! b ) + YY_FATAL_ERROR( "out of dynamic memory in yy_scan_buffer()" ); + + b->yy_buf_size = (int) (size - 2); /* "- 2" to take care of EOB's */ + b->yy_buf_pos = b->yy_ch_buf = base; + b->yy_is_our_buffer = 0; + b->yy_input_file = NULL; + b->yy_n_chars = b->yy_buf_size; + b->yy_is_interactive = 0; + b->yy_at_bol = 1; + b->yy_fill_buffer = 0; + b->yy_buffer_status = YY_BUFFER_NEW; + + yy_switch_to_buffer( b , yyscanner ); + + return b; +} + +/** Setup the input buffer state to scan a string. The next call to yylex() will + * scan from a @e copy of @a str. + * @param yystr a NUL-terminated string to scan + * @param yyscanner The scanner object. + * @return the newly allocated buffer state object. + * @note If you want to scan bytes that may contain NUL values, then use + * yy_scan_bytes() instead. + */ +YY_BUFFER_STATE yy_scan_string (const char * yystr , yyscan_t yyscanner) +{ + + return yy_scan_bytes( yystr, (int) strlen(yystr) , yyscanner); +} + +/** Setup the input buffer state to scan the given bytes. The next call to yylex() will + * scan from a @e copy of @a bytes. + * @param yybytes the byte buffer to scan + * @param _yybytes_len the number of bytes in the buffer pointed to by @a bytes. + * @param yyscanner The scanner object. + * @return the newly allocated buffer state object. + */ +YY_BUFFER_STATE yy_scan_bytes (const char * yybytes, int _yybytes_len , yyscan_t yyscanner) +{ + YY_BUFFER_STATE b; + char *buf; + yy_size_t n; + int i; + + /* Get memory for full buffer, including space for trailing EOB's. */ + n = (yy_size_t) (_yybytes_len + 2); + buf = (char *) yyalloc( n , yyscanner ); + if ( ! buf ) + YY_FATAL_ERROR( "out of dynamic memory in yy_scan_bytes()" ); + + for ( i = 0; i < _yybytes_len; ++i ) + buf[i] = yybytes[i]; + + buf[_yybytes_len] = buf[_yybytes_len+1] = YY_END_OF_BUFFER_CHAR; + + b = yy_scan_buffer( buf, n , yyscanner); + if ( ! b ) + YY_FATAL_ERROR( "bad buffer in yy_scan_bytes()" ); + + /* It's okay to grow etc. this buffer, and we should throw it + * away when we're done. + */ + b->yy_is_our_buffer = 1; + + return b; +} + +#ifndef YY_EXIT_FAILURE +#define YY_EXIT_FAILURE 2 +#endif + +static void yynoreturn yy_fatal_error (const char* msg , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + (void)yyg; + fprintf( stderr, "%s\n", msg ); + exit( YY_EXIT_FAILURE ); +} + +/* Redefine yyless() so it works in section 3 code. */ + +#undef yyless +#define yyless(n) \ + do \ + { \ + /* Undo effects of setting up yytext. */ \ + int yyless_macro_arg = (n); \ + YY_LESS_LINENO(yyless_macro_arg);\ + yytext[yyleng] = yyg->yy_hold_char; \ + yyg->yy_c_buf_p = yytext + yyless_macro_arg; \ + yyg->yy_hold_char = *yyg->yy_c_buf_p; \ + *yyg->yy_c_buf_p = '\0'; \ + yyleng = yyless_macro_arg; \ + } \ + while ( 0 ) + +/* Accessor methods (get/set functions) to struct members. */ + +/** Get the user-defined data for this scanner. + * @param yyscanner The scanner object. + */ +YY_EXTRA_TYPE yyget_extra (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + return yyextra; +} + +/** Get the current line number. + * @param yyscanner The scanner object. + */ +int yyget_lineno (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + if (! YY_CURRENT_BUFFER) + return 0; + + return yylineno; +} + +/** Get the current column number. + * @param yyscanner The scanner object. + */ +int yyget_column (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + if (! YY_CURRENT_BUFFER) + return 0; + + return yycolumn; +} + +/** Get the input stream. + * @param yyscanner The scanner object. + */ +FILE *yyget_in (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + return yyin; +} + +/** Get the output stream. + * @param yyscanner The scanner object. + */ +FILE *yyget_out (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + return yyout; +} + +/** Get the length of the current token. + * @param yyscanner The scanner object. + */ +int yyget_leng (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + return yyleng; +} + +/** Get the current token. + * @param yyscanner The scanner object. + */ + +char *yyget_text (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + return yytext; +} + +/** Set the user-defined data. This data is never touched by the scanner. + * @param user_defined The data to be associated with this scanner. + * @param yyscanner The scanner object. + */ +void yyset_extra (YY_EXTRA_TYPE user_defined , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + yyextra = user_defined ; +} + +/** Set the current line number. + * @param _line_number line number + * @param yyscanner The scanner object. + */ +void yyset_lineno (int _line_number , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + /* lineno is only valid if an input buffer exists. */ + if (! YY_CURRENT_BUFFER ) + YY_FATAL_ERROR( "yyset_lineno called with no buffer" ); + + yylineno = _line_number; +} + +/** Set the current column. + * @param _column_no column number + * @param yyscanner The scanner object. + */ +void yyset_column (int _column_no , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + /* column is only valid if an input buffer exists. */ + if (! YY_CURRENT_BUFFER ) + YY_FATAL_ERROR( "yyset_column called with no buffer" ); + + yycolumn = _column_no; +} + +/** Set the input stream. This does not discard the current + * input buffer. + * @param _in_str A readable stream. + * @param yyscanner The scanner object. + * @see yy_switch_to_buffer + */ +void yyset_in (FILE * _in_str , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + yyin = _in_str ; +} + +void yyset_out (FILE * _out_str , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + yyout = _out_str ; +} + +int yyget_debug (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + return yy_flex_debug; +} + +void yyset_debug (int _bdebug , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + yy_flex_debug = _bdebug ; +} + +/* Accessor methods for yylval and yylloc */ + +YYSTYPE * yyget_lval (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + return yylval; +} + +void yyset_lval (YYSTYPE * yylval_param , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + yylval = yylval_param; +} + +/* User-visible API */ + +/* yylex_init is special because it creates the scanner itself, so it is + * the ONLY reentrant function that doesn't take the scanner as the last argument. + * That's why we explicitly handle the declaration, instead of using our macros. + */ +int yylex_init(yyscan_t* ptr_yy_globals) +{ + if (ptr_yy_globals == NULL){ + errno = EINVAL; + return 1; + } + + *ptr_yy_globals = (yyscan_t) yyalloc ( sizeof( struct yyguts_t ), NULL ); + + if (*ptr_yy_globals == NULL){ + errno = ENOMEM; + return 1; + } + + /* By setting to 0xAA, we expose bugs in yy_init_globals. Leave at 0x00 for releases. */ + memset(*ptr_yy_globals,0x00,sizeof(struct yyguts_t)); + + return yy_init_globals ( *ptr_yy_globals ); +} + +/* yylex_init_extra has the same functionality as yylex_init, but follows the + * convention of taking the scanner as the last argument. Note however, that + * this is a *pointer* to a scanner, as it will be allocated by this call (and + * is the reason, too, why this function also must handle its own declaration). + * The user defined value in the first argument will be available to yyalloc in + * the yyextra field. + */ +int yylex_init_extra( YY_EXTRA_TYPE yy_user_defined, yyscan_t* ptr_yy_globals ) +{ + struct yyguts_t dummy_yyguts; + + yyset_extra (yy_user_defined, &dummy_yyguts); + + if (ptr_yy_globals == NULL){ + errno = EINVAL; + return 1; + } + + *ptr_yy_globals = (yyscan_t) yyalloc ( sizeof( struct yyguts_t ), &dummy_yyguts ); + + if (*ptr_yy_globals == NULL){ + errno = ENOMEM; + return 1; + } + + /* By setting to 0xAA, we expose bugs in + yy_init_globals. Leave at 0x00 for releases. */ + memset(*ptr_yy_globals,0x00,sizeof(struct yyguts_t)); + + yyset_extra (yy_user_defined, *ptr_yy_globals); + + return yy_init_globals ( *ptr_yy_globals ); +} + +static int yy_init_globals (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + /* Initialization is the same as for the non-reentrant scanner. + * This function is called from yylex_destroy(), so don't allocate here. + */ + + yyg->yy_buffer_stack = NULL; + yyg->yy_buffer_stack_top = 0; + yyg->yy_buffer_stack_max = 0; + yyg->yy_c_buf_p = NULL; + yyg->yy_init = 0; + yyg->yy_start = 0; + + yyg->yy_start_stack_ptr = 0; + yyg->yy_start_stack_depth = 0; + yyg->yy_start_stack = NULL; + +/* Defined in main.c */ +#ifdef YY_STDINIT + yyin = stdin; + yyout = stdout; +#else + yyin = NULL; + yyout = NULL; +#endif + + /* For future reference: Set errno on error, since we are called by + * yylex_init() + */ + return 0; +} + +/* yylex_destroy is for both reentrant and non-reentrant scanners. */ +int yylex_destroy (yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + + /* Pop the buffer stack, destroying each element. */ + while(YY_CURRENT_BUFFER){ + yy_delete_buffer( YY_CURRENT_BUFFER , yyscanner ); + YY_CURRENT_BUFFER_LVALUE = NULL; + yypop_buffer_state(yyscanner); + } + + /* Destroy the stack itself. */ + yyfree(yyg->yy_buffer_stack , yyscanner); + yyg->yy_buffer_stack = NULL; + + /* Destroy the start condition stack. */ + yyfree( yyg->yy_start_stack , yyscanner ); + yyg->yy_start_stack = NULL; + + /* Reset the globals. This is important in a non-reentrant scanner so the next time + * yylex() is called, initialization will occur. */ + yy_init_globals( yyscanner); + + /* Destroy the main struct (reentrant only). */ + yyfree ( yyscanner , yyscanner ); + yyscanner = NULL; + return 0; +} + +/* + * Internal utility routines. + */ + +#ifndef yytext_ptr +static void yy_flex_strncpy (char* s1, const char * s2, int n , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + (void)yyg; + + int i; + for ( i = 0; i < n; ++i ) + s1[i] = s2[i]; +} +#endif + +#ifdef YY_NEED_STRLEN +static int yy_flex_strlen (const char * s , yyscan_t yyscanner) +{ + int n; + for ( n = 0; s[n]; ++n ) + ; + + return n; +} +#endif + +void *yyalloc (yy_size_t size , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + (void)yyg; + return malloc(size); +} + +void *yyrealloc (void * ptr, yy_size_t size , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + (void)yyg; + + /* The cast to (char *) in the following accommodates both + * implementations that use char* generic pointers, and those + * that use void* generic pointers. It works with the latter + * because both ANSI C and C++ allow castless assignment from + * any pointer type to void*, and deal with argument conversions + * as though doing an assignment. + */ + return realloc(ptr, size); +} + +void yyfree (void * ptr , yyscan_t yyscanner) +{ + struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; + (void)yyg; + free( (char *) ptr ); /* see yyrealloc() for (char *) cast */ +} + +#define YYTABLES_NAME "yytables" + +#line 893 "psqlscan.l" + + +/* LCOV_EXCL_STOP */ + +/* + * Create a lexer working state struct. + * + * callbacks is a struct of function pointers that encapsulate some + * behavior we need from the surrounding program. This struct must + * remain valid for the lifespan of the PsqlScanState. + */ +PsqlScanState +psql_scan_create(const PsqlScanCallbacks *callbacks) +{ + PsqlScanState state; + + state = (PsqlScanStateData *) pg_malloc0(sizeof(PsqlScanStateData)); + + state->callbacks = callbacks; + + yylex_init(&state->scanner); + + yyset_extra(state, state->scanner); + + psql_scan_reset(state); + + return state; +} + +/* + * Destroy a lexer working state struct, releasing all resources. + */ +void +psql_scan_destroy(PsqlScanState state) +{ + psql_scan_finish(state); + + psql_scan_reset(state); + + yylex_destroy(state->scanner); + + free(state); +} + +/* + * Set the callback passthrough pointer for the lexer. + * + * This could have been integrated into psql_scan_create, but keeping it + * separate allows the application to change the pointer later, which might + * be useful. + */ +void +psql_scan_set_passthrough(PsqlScanState state, void *passthrough) +{ + state->cb_passthrough = passthrough; +} + +/* + * Set up to perform lexing of the given input line. + * + * The text at *line, extending for line_len bytes, will be scanned by + * subsequent calls to the psql_scan routines. psql_scan_finish should + * be called when scanning is complete. Note that the lexer retains + * a pointer to the storage at *line --- this string must not be altered + * or freed until after psql_scan_finish is called. + * + * encoding is the libpq identifier for the character encoding in use, + * and std_strings says whether standard_conforming_strings is on. + */ +void +psql_scan_setup(PsqlScanState state, + const char *line, int line_len, + int encoding, bool std_strings) +{ + /* Mustn't be scanning already */ + Assert(state->scanbufhandle == NULL); + Assert(state->buffer_stack == NULL); + + /* Do we need to hack the character set encoding? */ + state->encoding = encoding; + state->safe_encoding = pg_valid_server_encoding_id(encoding); + + /* Save standard-strings flag as well */ + state->std_strings = std_strings; + + /* Set up flex input buffer with appropriate translation and padding */ + state->scanbufhandle = psqlscan_prepare_buffer(state, line, line_len, + &state->scanbuf); + state->scanline = line; + + /* Set lookaside data in case we have to map unsafe encoding */ + state->curline = state->scanbuf; + state->refline = state->scanline; +} + +/* + * Do lexical analysis of SQL command text. + * + * The text previously passed to psql_scan_setup is scanned, and appended + * (possibly with transformation) to query_buf. + * + * The return value indicates the condition that stopped scanning: + * + * PSCAN_SEMICOLON: found a command-ending semicolon. (The semicolon is + * transferred to query_buf.) The command accumulated in query_buf should + * be executed, then clear query_buf and call again to scan the remainder + * of the line. + * + * PSCAN_BACKSLASH: found a backslash that starts a special command. + * Any previous data on the line has been transferred to query_buf. + * The caller will typically next apply a separate flex lexer to scan + * the special command. + * + * PSCAN_INCOMPLETE: the end of the line was reached, but we have an + * incomplete SQL command. *prompt is set to the appropriate prompt type. + * + * PSCAN_EOL: the end of the line was reached, and there is no lexical + * reason to consider the command incomplete. The caller may or may not + * choose to send it. *prompt is set to the appropriate prompt type if + * the caller chooses to collect more input. + * + * In the PSCAN_INCOMPLETE and PSCAN_EOL cases, psql_scan_finish() should + * be called next, then the cycle may be repeated with a fresh input line. + * + * In all cases, *prompt is set to an appropriate prompt type code for the + * next line-input operation. + */ +PsqlScanResult +psql_scan(PsqlScanState state, + PQExpBuffer query_buf, + promptStatus_t *prompt) +{ + PsqlScanResult result; + int lexresult; + + /* Must be scanning already */ + Assert(state->scanbufhandle != NULL); + + /* Set current output target */ + state->output_buf = query_buf; + + /* Set input source */ + if (state->buffer_stack != NULL) + yy_switch_to_buffer(state->buffer_stack->buf, state->scanner); + else + yy_switch_to_buffer(state->scanbufhandle, state->scanner); + + /* And lex. */ + lexresult = yylex(NULL, state->scanner); + + /* + * Check termination state and return appropriate result info. + */ + switch (lexresult) + { + case LEXRES_EOL: /* end of input */ + switch (state->start_state) + { + case INITIAL: + case xqs: /* we treat this like INITIAL */ + if (state->paren_depth > 0) + { + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_PAREN; + } + else if (query_buf->len > 0) + { + result = PSCAN_EOL; + *prompt = PROMPT_CONTINUE; + } + else + { + /* never bother to send an empty buffer */ + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_READY; + } + break; + case xb: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_SINGLEQUOTE; + break; + case xc: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_COMMENT; + break; + case xd: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_DOUBLEQUOTE; + break; + case xh: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_SINGLEQUOTE; + break; + case xe: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_SINGLEQUOTE; + break; + case xq: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_SINGLEQUOTE; + break; + case xdolq: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_DOLLARQUOTE; + break; + case xui: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_DOUBLEQUOTE; + break; + case xus: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_SINGLEQUOTE; + break; + default: + /* can't get here */ + fprintf(stderr, "invalid YY_START\n"); + exit(1); + } + break; + case LEXRES_SEMI: /* semicolon */ + result = PSCAN_SEMICOLON; + *prompt = PROMPT_READY; + break; + case LEXRES_BACKSLASH: /* backslash */ + result = PSCAN_BACKSLASH; + *prompt = PROMPT_READY; + break; + default: + /* can't get here */ + fprintf(stderr, "invalid yylex result\n"); + exit(1); + } + + return result; +} + +/* + * Clean up after scanning a string. This flushes any unread input and + * releases resources (but not the PsqlScanState itself). Note however + * that this does not reset the lexer scan state; that can be done by + * psql_scan_reset(), which is an orthogonal operation. + * + * It is legal to call this when not scanning anything (makes it easier + * to deal with error recovery). + */ +void +psql_scan_finish(PsqlScanState state) +{ + /* Drop any incomplete variable expansions. */ + while (state->buffer_stack != NULL) + psqlscan_pop_buffer_stack(state); + + /* Done with the outer scan buffer, too */ + if (state->scanbufhandle) + yy_delete_buffer(state->scanbufhandle, state->scanner); + state->scanbufhandle = NULL; + if (state->scanbuf) + free(state->scanbuf); + state->scanbuf = NULL; +} + +/* + * Reset lexer scanning state to start conditions. This is appropriate + * for executing \r psql commands (or any other time that we discard the + * prior contents of query_buf). It is not, however, necessary to do this + * when we execute and clear the buffer after getting a PSCAN_SEMICOLON or + * PSCAN_EOL scan result, because the scan state must be INITIAL when those + * conditions are returned. + * + * Note that this is unrelated to flushing unread input; that task is + * done by psql_scan_finish(). + */ +void +psql_scan_reset(PsqlScanState state) +{ + state->start_state = INITIAL; + state->paren_depth = 0; + state->xcdepth = 0; /* not really necessary */ + if (state->dolqstart) + free(state->dolqstart); + state->dolqstart = NULL; +} + +/* + * Reselect this lexer (psqlscan.l) after using another one. + * + * Currently and for foreseeable uses, it's sufficient to reset to INITIAL + * state, because we'd never switch to another lexer in a different state. + * However, we don't want to reset e.g. paren_depth, so this can't be + * the same as psql_scan_reset(). + * + * Note: psql setjmp error recovery just calls psql_scan_reset(), so that + * must be a superset of this. + * + * Note: it seems likely that other lexers could just assign INITIAL for + * themselves, since that probably has the value zero in every flex-generated + * lexer. But let's not assume that. + */ +void +psql_scan_reselect_sql_lexer(PsqlScanState state) +{ + state->start_state = INITIAL; +} + +/* + * Return true if lexer is currently in an "inside quotes" state. + * + * This is pretty grotty but is needed to preserve the old behavior + * that mainloop.c drops blank lines not inside quotes without even + * echoing them. + */ +bool +psql_scan_in_quote(PsqlScanState state) +{ + return state->start_state != INITIAL && + state->start_state != xqs; +} + +/* + * Push the given string onto the stack of stuff to scan. + * + * NOTE SIDE EFFECT: the new buffer is made the active flex input buffer. + */ +void +psqlscan_push_new_buffer(PsqlScanState state, const char *newstr, + const char *varname) +{ + StackElem *stackelem; + + stackelem = (StackElem *) pg_malloc(sizeof(StackElem)); + + /* + * In current usage, the passed varname points at the current flex input + * buffer; we must copy it before calling psqlscan_prepare_buffer() + * because that will change the buffer state. + */ + stackelem->varname = varname ? pg_strdup(varname) : NULL; + + stackelem->buf = psqlscan_prepare_buffer(state, newstr, strlen(newstr), + &stackelem->bufstring); + state->curline = stackelem->bufstring; + if (state->safe_encoding) + { + stackelem->origstring = NULL; + state->refline = stackelem->bufstring; + } + else + { + stackelem->origstring = pg_strdup(newstr); + state->refline = stackelem->origstring; + } + stackelem->next = state->buffer_stack; + state->buffer_stack = stackelem; +} + +/* + * Pop the topmost buffer stack item (there must be one!) + * + * NB: after this, the flex input state is unspecified; caller must + * switch to an appropriate buffer to continue lexing. + * See psqlscan_select_top_buffer(). + */ +void +psqlscan_pop_buffer_stack(PsqlScanState state) +{ + StackElem *stackelem = state->buffer_stack; + + state->buffer_stack = stackelem->next; + yy_delete_buffer(stackelem->buf, state->scanner); + free(stackelem->bufstring); + if (stackelem->origstring) + free(stackelem->origstring); + if (stackelem->varname) + free(stackelem->varname); + free(stackelem); +} + +/* + * Select the topmost surviving buffer as the active input. + */ +void +psqlscan_select_top_buffer(PsqlScanState state) +{ + StackElem *stackelem = state->buffer_stack; + + if (stackelem != NULL) + { + yy_switch_to_buffer(stackelem->buf, state->scanner); + state->curline = stackelem->bufstring; + state->refline = stackelem->origstring ? stackelem->origstring : stackelem->bufstring; + } + else + { + yy_switch_to_buffer(state->scanbufhandle, state->scanner); + state->curline = state->scanbuf; + state->refline = state->scanline; + } +} + +/* + * Check if specified variable name is the source for any string + * currently being scanned + */ +bool +psqlscan_var_is_current_source(PsqlScanState state, const char *varname) +{ + StackElem *stackelem; + + for (stackelem = state->buffer_stack; + stackelem != NULL; + stackelem = stackelem->next) + { + if (stackelem->varname && strcmp(stackelem->varname, varname) == 0) + return true; + } + return false; +} + +/* + * Set up a flex input buffer to scan the given data. We always make a + * copy of the data. If working in an unsafe encoding, the copy has + * multibyte sequences replaced by FFs to avoid fooling the lexer rules. + * + * NOTE SIDE EFFECT: the new buffer is made the active flex input buffer. + */ +YY_BUFFER_STATE +psqlscan_prepare_buffer(PsqlScanState state, const char *txt, int len, + char **txtcopy) +{ + char *newtxt; + + /* Flex wants two \0 characters after the actual data */ + newtxt = pg_malloc(len + 2); + *txtcopy = newtxt; + newtxt[len] = newtxt[len + 1] = YY_END_OF_BUFFER_CHAR; + + if (state->safe_encoding) + memcpy(newtxt, txt, len); + else + { + /* Gotta do it the hard way */ + int i = 0; + + while (i < len) + { + int thislen = PQmblen(txt + i, state->encoding); + + /* first byte should always be okay... */ + newtxt[i] = txt[i]; + i++; + while (--thislen > 0 && i < len) + newtxt[i++] = (char) 0xFF; + } + } + + return yy_scan_buffer(newtxt, len + 2, state->scanner); +} + +/* + * psqlscan_emit() --- body for ECHO macro + * + * NB: this must be used for ALL and ONLY the text copied from the flex + * input data. If you pass it something that is not part of the yytext + * string, you are making a mistake. Internally generated text can be + * appended directly to state->output_buf. + */ +void +psqlscan_emit(PsqlScanState state, const char *txt, int len) +{ + PQExpBuffer output_buf = state->output_buf; + + if (state->safe_encoding) + appendBinaryPQExpBuffer(output_buf, txt, len); + else + { + /* Gotta do it the hard way */ + const char *reference = state->refline; + int i; + + reference += (txt - state->curline); + + for (i = 0; i < len; i++) + { + char ch = txt[i]; + + if (ch == (char) 0xFF) + ch = reference[i]; + appendPQExpBufferChar(output_buf, ch); + } + } +} + +/* + * psqlscan_extract_substring --- fetch value of (part of) the current token + * + * This is like psqlscan_emit(), except that the data is returned as a + * malloc'd string rather than being pushed directly to state->output_buf. + */ +char * +psqlscan_extract_substring(PsqlScanState state, const char *txt, int len) +{ + char *result = (char *) pg_malloc(len + 1); + + if (state->safe_encoding) + memcpy(result, txt, len); + else + { + /* Gotta do it the hard way */ + const char *reference = state->refline; + int i; + + reference += (txt - state->curline); + + for (i = 0; i < len; i++) + { + char ch = txt[i]; + + if (ch == (char) 0xFF) + ch = reference[i]; + result[i] = ch; + } + } + result[len] = '\0'; + return result; +} + +/* + * psqlscan_escape_variable --- process :'VARIABLE' or :"VARIABLE" + * + * If the variable name is found, escape its value using the appropriate + * quoting method and emit the value to output_buf. (Since the result is + * surely quoted, there is never any reason to rescan it.) If we don't + * find the variable or escaping fails, emit the token as-is. + */ +void +psqlscan_escape_variable(PsqlScanState state, const char *txt, int len, + PsqlScanQuoteType quote) +{ + char *varname; + char *value; + + /* Variable lookup. */ + varname = psqlscan_extract_substring(state, txt + 2, len - 3); + if (state->callbacks->get_variable) + value = state->callbacks->get_variable(varname, quote, + state->cb_passthrough); + else + value = NULL; + free(varname); + + if (value) + { + /* Emit the suitably-escaped value */ + appendPQExpBufferStr(state->output_buf, value); + free(value); + } + else + { + /* Emit original token as-is */ + psqlscan_emit(state, txt, len); + } +} + +void +psqlscan_test_variable(PsqlScanState state, const char *txt, int len) +{ + char *varname; + char *value; + + varname = psqlscan_extract_substring(state, txt + 3, len - 4); + if (state->callbacks->get_variable) + value = state->callbacks->get_variable(varname, PQUOTE_PLAIN, + state->cb_passthrough); + else + value = NULL; + free(varname); + + if (value != NULL) + { + psqlscan_emit(state, "TRUE", 4); + free(value); + } + else + { + psqlscan_emit(state, "FALSE", 5); + } +} + diff --git a/src/fe_utils/psqlscan.l b/src/fe_utils/psqlscan.l new file mode 100644 index 0000000..08dffde --- /dev/null +++ b/src/fe_utils/psqlscan.l @@ -0,0 +1,1478 @@ +%top{ +/*------------------------------------------------------------------------- + * + * psqlscan.l + * lexical scanner for SQL commands + * + * This lexer used to be part of psql, and that heritage is reflected in + * the file name as well as function and typedef names, though it can now + * be used by other frontend programs as well. It's also possible to extend + * this lexer with a compatible add-on lexer to handle program-specific + * backslash commands. + * + * This code is mainly concerned with determining where the end of a SQL + * statement is: we are looking for semicolons that are not within quotes, + * comments, or parentheses. The most reliable way to handle this is to + * borrow the backend's flex lexer rules, lock, stock, and barrel. The rules + * below are (except for a few) the same as the backend's, but their actions + * are just ECHO whereas the backend's actions generally do other things. + * + * XXX The rules in this file must be kept in sync with the backend lexer!!! + * + * XXX Avoid creating backtracking cases --- see the backend lexer for info. + * + * See psqlscan_int.h for additional commentary. + * + * + * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * IDENTIFICATION + * src/fe_utils/psqlscan.l + * + *------------------------------------------------------------------------- + */ +#include "postgres_fe.h" + +#include "common/logging.h" +#include "fe_utils/psqlscan.h" + +#include "libpq-fe.h" +} + +%{ + +/* LCOV_EXCL_START */ + +#include "fe_utils/psqlscan_int.h" + +/* + * We must have a typedef YYSTYPE for yylex's first argument, but this lexer + * doesn't presently make use of that argument, so just declare it as int. + */ +typedef int YYSTYPE; + +/* + * Set the type of yyextra; we use it as a pointer back to the containing + * PsqlScanState. + */ +#define YY_EXTRA_TYPE PsqlScanState + + +/* Return values from yylex() */ +#define LEXRES_EOL 0 /* end of input */ +#define LEXRES_SEMI 1 /* command-terminating semicolon found */ +#define LEXRES_BACKSLASH 2 /* backslash command start */ + + +#define ECHO psqlscan_emit(cur_state, yytext, yyleng) + +/* + * Work around a bug in flex 2.5.35: it emits a couple of functions that + * it forgets to emit declarations for. Since we use -Wmissing-prototypes, + * this would cause warnings. Providing our own declarations should be + * harmless even when the bug gets fixed. + */ +extern int psql_yyget_column(yyscan_t yyscanner); +extern void psql_yyset_column(int column_no, yyscan_t yyscanner); + +%} + +%option reentrant +%option bison-bridge +%option 8bit +%option never-interactive +%option nodefault +%option noinput +%option nounput +%option noyywrap +%option warn +%option prefix="psql_yy" + +/* + * All of the following definitions and rules should exactly match + * src/backend/parser/scan.l so far as the flex patterns are concerned. + * The rule bodies are just ECHO as opposed to what the backend does, + * however. (But be sure to duplicate code that affects the lexing process, + * such as BEGIN() and yyless().) Also, psqlscan uses a single <<EOF>> rule + * whereas scan.l has a separate one for each exclusive state. + */ + +/* + * OK, here is a short description of lex/flex rules behavior. + * The longest pattern which matches an input string is always chosen. + * For equal-length patterns, the first occurring in the rules list is chosen. + * INITIAL is the starting state, to which all non-conditional rules apply. + * Exclusive states change parsing rules while the state is active. When in + * an exclusive state, only those rules defined for that state apply. + * + * We use exclusive states for quoted strings, extended comments, + * and to eliminate parsing troubles for numeric strings. + * Exclusive states: + * <xb> bit string literal + * <xc> extended C-style comments + * <xd> delimited identifiers (double-quoted identifiers) + * <xh> hexadecimal numeric string + * <xq> standard quoted strings + * <xqs> quote stop (detect continued strings) + * <xe> extended quoted strings (support backslash escape sequences) + * <xdolq> $foo$ quoted strings + * <xui> quoted identifier with Unicode escapes + * <xus> quoted string with Unicode escapes + * + * Note: we intentionally don't mimic the backend's <xeu> state; we have + * no need to distinguish it from <xe> state, and no good way to get out + * of it in error cases. The backend just throws yyerror() in those + * cases, but that's not an option here. + */ + +%x xb +%x xc +%x xd +%x xh +%x xq +%x xqs +%x xe +%x xdolq +%x xui +%x xus + +/* + * In order to make the world safe for Windows and Mac clients as well as + * Unix ones, we accept either \n or \r as a newline. A DOS-style \r\n + * sequence will be seen as two successive newlines, but that doesn't cause + * any problems. Comments that start with -- and extend to the next + * newline are treated as equivalent to a single whitespace character. + * + * NOTE a fine point: if there is no newline following --, we will absorb + * everything to the end of the input as a comment. This is correct. Older + * versions of Postgres failed to recognize -- as a comment if the input + * did not end with a newline. + * + * XXX perhaps \f (formfeed) should be treated as a newline as well? + * + * XXX if you change the set of whitespace characters, fix scanner_isspace() + * to agree. + */ + +space [ \t\n\r\f] +horiz_space [ \t\f] +newline [\n\r] +non_newline [^\n\r] + +comment ("--"{non_newline}*) + +whitespace ({space}+|{comment}) + +/* + * SQL requires at least one newline in the whitespace separating + * string literals that are to be concatenated. Silly, but who are we + * to argue? Note that {whitespace_with_newline} should not have * after + * it, whereas {whitespace} should generally have a * after it... + */ + +special_whitespace ({space}+|{comment}{newline}) +horiz_whitespace ({horiz_space}|{comment}) +whitespace_with_newline ({horiz_whitespace}*{newline}{special_whitespace}*) + +quote ' +/* If we see {quote} then {quotecontinue}, the quoted string continues */ +quotecontinue {whitespace_with_newline}{quote} + +/* + * {quotecontinuefail} is needed to avoid lexer backup when we fail to match + * {quotecontinue}. It might seem that this could just be {whitespace}*, + * but if there's a dash after {whitespace_with_newline}, it must be consumed + * to see if there's another dash --- which would start a {comment} and thus + * allow continuation of the {quotecontinue} token. + */ +quotecontinuefail {whitespace}*"-"? + +/* Bit string + * It is tempting to scan the string for only those characters + * which are allowed. However, this leads to silently swallowed + * characters if illegal characters are included in the string. + * For example, if xbinside is [01] then B'ABCD' is interpreted + * as a zero-length string, and the ABCD' is lost! + * Better to pass the string forward and let the input routines + * validate the contents. + */ +xbstart [bB]{quote} +xbinside [^']* + +/* Hexadecimal number */ +xhstart [xX]{quote} +xhinside [^']* + +/* National character */ +xnstart [nN]{quote} + +/* Quoted string that allows backslash escapes */ +xestart [eE]{quote} +xeinside [^\\']+ +xeescape [\\][^0-7] +xeoctesc [\\][0-7]{1,3} +xehexesc [\\]x[0-9A-Fa-f]{1,2} +xeunicode [\\](u[0-9A-Fa-f]{4}|U[0-9A-Fa-f]{8}) +xeunicodefail [\\](u[0-9A-Fa-f]{0,3}|U[0-9A-Fa-f]{0,7}) + +/* Extended quote + * xqdouble implements embedded quote, '''' + */ +xqstart {quote} +xqdouble {quote}{quote} +xqinside [^']+ + +/* $foo$ style quotes ("dollar quoting") + * The quoted string starts with $foo$ where "foo" is an optional string + * in the form of an identifier, except that it may not contain "$", + * and extends to the first occurrence of an identical string. + * There is *no* processing of the quoted text. + * + * {dolqfailed} is an error rule to avoid scanner backup when {dolqdelim} + * fails to match its trailing "$". + */ +dolq_start [A-Za-z\200-\377_] +dolq_cont [A-Za-z\200-\377_0-9] +dolqdelim \$({dolq_start}{dolq_cont}*)?\$ +dolqfailed \${dolq_start}{dolq_cont}* +dolqinside [^$]+ + +/* Double quote + * Allows embedded spaces and other special characters into identifiers. + */ +dquote \" +xdstart {dquote} +xdstop {dquote} +xddouble {dquote}{dquote} +xdinside [^"]+ + +/* Quoted identifier with Unicode escapes */ +xuistart [uU]&{dquote} + +/* Quoted string with Unicode escapes */ +xusstart [uU]&{quote} + +/* error rule to avoid backup */ +xufailed [uU]& + + +/* C-style comments + * + * The "extended comment" syntax closely resembles allowable operator syntax. + * The tricky part here is to get lex to recognize a string starting with + * slash-star as a comment, when interpreting it as an operator would produce + * a longer match --- remember lex will prefer a longer match! Also, if we + * have something like plus-slash-star, lex will think this is a 3-character + * operator whereas we want to see it as a + operator and a comment start. + * The solution is two-fold: + * 1. append {op_chars}* to xcstart so that it matches as much text as + * {operator} would. Then the tie-breaker (first matching rule of same + * length) ensures xcstart wins. We put back the extra stuff with yyless() + * in case it contains a star-slash that should terminate the comment. + * 2. In the operator rule, check for slash-star within the operator, and + * if found throw it back with yyless(). This handles the plus-slash-star + * problem. + * Dash-dash comments have similar interactions with the operator rule. + */ +xcstart \/\*{op_chars}* +xcstop \*+\/ +xcinside [^*/]+ + +digit [0-9] +ident_start [A-Za-z\200-\377_] +ident_cont [A-Za-z\200-\377_0-9\$] + +identifier {ident_start}{ident_cont}* + +/* Assorted special-case operators and operator-like tokens */ +typecast "::" +dot_dot \.\. +colon_equals ":=" + +/* + * These operator-like tokens (unlike the above ones) also match the {operator} + * rule, which means that they might be overridden by a longer match if they + * are followed by a comment start or a + or - character. Accordingly, if you + * add to this list, you must also add corresponding code to the {operator} + * block to return the correct token in such cases. (This is not needed in + * psqlscan.l since the token value is ignored there.) + */ +equals_greater "=>" +less_equals "<=" +greater_equals ">=" +less_greater "<>" +not_equals "!=" + +/* + * "self" is the set of chars that should be returned as single-character + * tokens. "op_chars" is the set of chars that can make up "Op" tokens, + * which can be one or more characters long (but if a single-char token + * appears in the "self" set, it is not to be returned as an Op). Note + * that the sets overlap, but each has some chars that are not in the other. + * + * If you change either set, adjust the character lists appearing in the + * rule for "operator"! + */ +self [,()\[\].;\:\+\-\*\/\%\^\<\>\=] +op_chars [\~\!\@\#\^\&\|\`\?\+\-\*\/\%\<\>\=] +operator {op_chars}+ + +/* we no longer allow unary minus in numbers. + * instead we pass it separately to parser. there it gets + * coerced via doNegate() -- Leon aug 20 1999 + * + * {decimalfail} is used because we would like "1..10" to lex as 1, dot_dot, 10. + * + * {realfail1} and {realfail2} are added to prevent the need for scanner + * backup when the {real} rule fails to match completely. + */ + +integer {digit}+ +decimal (({digit}*\.{digit}+)|({digit}+\.{digit}*)) +decimalfail {digit}+\.\. +real ({integer}|{decimal})[Ee][-+]?{digit}+ +realfail1 ({integer}|{decimal})[Ee] +realfail2 ({integer}|{decimal})[Ee][-+] + +param \${integer} + +/* psql-specific: characters allowed in variable names */ +variable_char [A-Za-z\200-\377_0-9] + +other . + +/* + * Dollar quoted strings are totally opaque, and no escaping is done on them. + * Other quoted strings must allow some special characters such as single-quote + * and newline. + * Embedded single-quotes are implemented both in the SQL standard + * style of two adjacent single quotes "''" and in the Postgres/Java style + * of escaped-quote "\'". + * Other embedded escaped characters are matched explicitly and the leading + * backslash is dropped from the string. + * Note that xcstart must appear before operator, as explained above! + * Also whitespace (comment) must appear before operator. + */ + +%% + +%{ + /* Declare some local variables inside yylex(), for convenience */ + PsqlScanState cur_state = yyextra; + PQExpBuffer output_buf = cur_state->output_buf; + + /* + * Force flex into the state indicated by start_state. This has a + * couple of purposes: it lets some of the functions below set a new + * starting state without ugly direct access to flex variables, and it + * allows us to transition from one flex lexer to another so that we + * can lex different parts of the source string using separate lexers. + */ + BEGIN(cur_state->start_state); +%} + +{whitespace} { + /* + * Note that the whitespace rule includes both true + * whitespace and single-line ("--" style) comments. + * We suppress whitespace at the start of the query + * buffer. We also suppress all single-line comments, + * which is pretty dubious but is the historical + * behavior. + */ + if (!(output_buf->len == 0 || yytext[0] == '-')) + ECHO; + } + +{xcstart} { + cur_state->xcdepth = 0; + BEGIN(xc); + /* Put back any characters past slash-star; see above */ + yyless(2); + ECHO; + } + +<xc>{ +{xcstart} { + cur_state->xcdepth++; + /* Put back any characters past slash-star; see above */ + yyless(2); + ECHO; + } + +{xcstop} { + if (cur_state->xcdepth <= 0) + BEGIN(INITIAL); + else + cur_state->xcdepth--; + ECHO; + } + +{xcinside} { + ECHO; + } + +{op_chars} { + ECHO; + } + +\*+ { + ECHO; + } +} /* <xc> */ + +{xbstart} { + BEGIN(xb); + ECHO; + } +<xh>{xhinside} | +<xb>{xbinside} { + ECHO; + } + +{xhstart} { + /* Hexadecimal bit type. + * At some point we should simply pass the string + * forward to the parser and label it there. + * In the meantime, place a leading "x" on the string + * to mark it for the input routine as a hex string. + */ + BEGIN(xh); + ECHO; + } + +{xnstart} { + yyless(1); /* eat only 'n' this time */ + ECHO; + } + +{xqstart} { + if (cur_state->std_strings) + BEGIN(xq); + else + BEGIN(xe); + ECHO; + } +{xestart} { + BEGIN(xe); + ECHO; + } +{xusstart} { + BEGIN(xus); + ECHO; + } + +<xb,xh,xq,xe,xus>{quote} { + /* + * When we are scanning a quoted string and see an end + * quote, we must look ahead for a possible continuation. + * If we don't see one, we know the end quote was in fact + * the end of the string. To reduce the lexer table size, + * we use a single "xqs" state to do the lookahead for all + * types of strings. + */ + cur_state->state_before_str_stop = YYSTATE; + BEGIN(xqs); + ECHO; + } +<xqs>{quotecontinue} { + /* + * Found a quote continuation, so return to the in-quote + * state and continue scanning the literal. Nothing is + * added to the literal's contents. + */ + BEGIN(cur_state->state_before_str_stop); + ECHO; + } +<xqs>{quotecontinuefail} | +<xqs>{other} { + /* + * Failed to see a quote continuation. Throw back + * everything after the end quote, and handle the string + * according to the state we were in previously. + */ + yyless(0); + BEGIN(INITIAL); + /* There's nothing to echo ... */ + } + +<xq,xe,xus>{xqdouble} { + ECHO; + } +<xq,xus>{xqinside} { + ECHO; + } +<xe>{xeinside} { + ECHO; + } +<xe>{xeunicode} { + ECHO; + } +<xe>{xeunicodefail} { + ECHO; + } +<xe>{xeescape} { + ECHO; + } +<xe>{xeoctesc} { + ECHO; + } +<xe>{xehexesc} { + ECHO; + } +<xe>. { + /* This is only needed for \ just before EOF */ + ECHO; + } + +{dolqdelim} { + cur_state->dolqstart = pg_strdup(yytext); + BEGIN(xdolq); + ECHO; + } +{dolqfailed} { + /* throw back all but the initial "$" */ + yyless(1); + ECHO; + } +<xdolq>{dolqdelim} { + if (strcmp(yytext, cur_state->dolqstart) == 0) + { + free(cur_state->dolqstart); + cur_state->dolqstart = NULL; + BEGIN(INITIAL); + } + else + { + /* + * When we fail to match $...$ to dolqstart, transfer + * the $... part to the output, but put back the final + * $ for rescanning. Consider $delim$...$junk$delim$ + */ + yyless(yyleng - 1); + } + ECHO; + } +<xdolq>{dolqinside} { + ECHO; + } +<xdolq>{dolqfailed} { + ECHO; + } +<xdolq>. { + /* This is only needed for $ inside the quoted text */ + ECHO; + } + +{xdstart} { + BEGIN(xd); + ECHO; + } +{xuistart} { + BEGIN(xui); + ECHO; + } +<xd>{xdstop} { + BEGIN(INITIAL); + ECHO; + } +<xui>{dquote} { + BEGIN(INITIAL); + ECHO; + } +<xd,xui>{xddouble} { + ECHO; + } +<xd,xui>{xdinside} { + ECHO; + } + +{xufailed} { + /* throw back all but the initial u/U */ + yyless(1); + ECHO; + } + +{typecast} { + ECHO; + } + +{dot_dot} { + ECHO; + } + +{colon_equals} { + ECHO; + } + +{equals_greater} { + ECHO; + } + +{less_equals} { + ECHO; + } + +{greater_equals} { + ECHO; + } + +{less_greater} { + ECHO; + } + +{not_equals} { + ECHO; + } + + /* + * These rules are specific to psql --- they implement parenthesis + * counting and detection of command-ending semicolon. These must + * appear before the {self} rule so that they take precedence over it. + */ + +"(" { + cur_state->paren_depth++; + ECHO; + } + +")" { + if (cur_state->paren_depth > 0) + cur_state->paren_depth--; + ECHO; + } + +";" { + ECHO; + if (cur_state->paren_depth == 0) + { + /* Terminate lexing temporarily */ + cur_state->start_state = YY_START; + return LEXRES_SEMI; + } + } + + /* + * psql-specific rules to handle backslash commands and variable + * substitution. We want these before {self}, also. + */ + +"\\"[;:] { + /* Force a semi-colon or colon into the query buffer */ + psqlscan_emit(cur_state, yytext + 1, 1); + } + +"\\" { + /* Terminate lexing temporarily */ + cur_state->start_state = YY_START; + return LEXRES_BACKSLASH; + } + +:{variable_char}+ { + /* Possible psql variable substitution */ + char *varname; + char *value; + + varname = psqlscan_extract_substring(cur_state, + yytext + 1, + yyleng - 1); + if (cur_state->callbacks->get_variable) + value = cur_state->callbacks->get_variable(varname, + PQUOTE_PLAIN, + cur_state->cb_passthrough); + else + value = NULL; + + if (value) + { + /* It is a variable, check for recursion */ + if (psqlscan_var_is_current_source(cur_state, varname)) + { + /* Recursive expansion --- don't go there */ + pg_log_warning("skipping recursive expansion of variable \"%s\"", + varname); + /* Instead copy the string as is */ + ECHO; + } + else + { + /* OK, perform substitution */ + psqlscan_push_new_buffer(cur_state, value, varname); + /* yy_scan_string already made buffer active */ + } + free(value); + } + else + { + /* + * if the variable doesn't exist we'll copy the string + * as is + */ + ECHO; + } + + free(varname); + } + +:'{variable_char}+' { + psqlscan_escape_variable(cur_state, yytext, yyleng, + PQUOTE_SQL_LITERAL); + } + +:\"{variable_char}+\" { + psqlscan_escape_variable(cur_state, yytext, yyleng, + PQUOTE_SQL_IDENT); + } + +:\{\?{variable_char}+\} { + psqlscan_test_variable(cur_state, yytext, yyleng); + } + + /* + * These rules just avoid the need for scanner backup if one of the + * three rules above fails to match completely. + */ + +:'{variable_char}* { + /* Throw back everything but the colon */ + yyless(1); + ECHO; + } + +:\"{variable_char}* { + /* Throw back everything but the colon */ + yyless(1); + ECHO; + } + +:\{\?{variable_char}* { + /* Throw back everything but the colon */ + yyless(1); + ECHO; + } +:\{ { + /* Throw back everything but the colon */ + yyless(1); + ECHO; + } + + /* + * Back to backend-compatible rules. + */ + +{self} { + ECHO; + } + +{operator} { + /* + * Check for embedded slash-star or dash-dash; those + * are comment starts, so operator must stop there. + * Note that slash-star or dash-dash at the first + * character will match a prior rule, not this one. + */ + int nchars = yyleng; + char *slashstar = strstr(yytext, "/*"); + char *dashdash = strstr(yytext, "--"); + + if (slashstar && dashdash) + { + /* if both appear, take the first one */ + if (slashstar > dashdash) + slashstar = dashdash; + } + else if (!slashstar) + slashstar = dashdash; + if (slashstar) + nchars = slashstar - yytext; + + /* + * For SQL compatibility, '+' and '-' cannot be the + * last char of a multi-char operator unless the operator + * contains chars that are not in SQL operators. + * The idea is to lex '=-' as two operators, but not + * to forbid operator names like '?-' that could not be + * sequences of SQL operators. + */ + if (nchars > 1 && + (yytext[nchars - 1] == '+' || + yytext[nchars - 1] == '-')) + { + int ic; + + for (ic = nchars - 2; ic >= 0; ic--) + { + char c = yytext[ic]; + if (c == '~' || c == '!' || c == '@' || + c == '#' || c == '^' || c == '&' || + c == '|' || c == '`' || c == '?' || + c == '%') + break; + } + if (ic < 0) + { + /* + * didn't find a qualifying character, so remove + * all trailing [+-] + */ + do { + nchars--; + } while (nchars > 1 && + (yytext[nchars - 1] == '+' || + yytext[nchars - 1] == '-')); + } + } + + if (nchars < yyleng) + { + /* Strip the unwanted chars from the token */ + yyless(nchars); + } + ECHO; + } + +{param} { + ECHO; + } + +{integer} { + ECHO; + } +{decimal} { + ECHO; + } +{decimalfail} { + /* throw back the .., and treat as integer */ + yyless(yyleng - 2); + ECHO; + } +{real} { + ECHO; + } +{realfail1} { + /* + * throw back the [Ee], and figure out whether what + * remains is an {integer} or {decimal}. + * (in psql, we don't actually care...) + */ + yyless(yyleng - 1); + ECHO; + } +{realfail2} { + /* throw back the [Ee][+-], and proceed as above */ + yyless(yyleng - 2); + ECHO; + } + + +{identifier} { + ECHO; + } + +{other} { + ECHO; + } + +<<EOF>> { + if (cur_state->buffer_stack == NULL) + { + cur_state->start_state = YY_START; + return LEXRES_EOL; /* end of input reached */ + } + + /* + * We were expanding a variable, so pop the inclusion + * stack and keep lexing + */ + psqlscan_pop_buffer_stack(cur_state); + psqlscan_select_top_buffer(cur_state); + } + +%% + +/* LCOV_EXCL_STOP */ + +/* + * Create a lexer working state struct. + * + * callbacks is a struct of function pointers that encapsulate some + * behavior we need from the surrounding program. This struct must + * remain valid for the lifespan of the PsqlScanState. + */ +PsqlScanState +psql_scan_create(const PsqlScanCallbacks *callbacks) +{ + PsqlScanState state; + + state = (PsqlScanStateData *) pg_malloc0(sizeof(PsqlScanStateData)); + + state->callbacks = callbacks; + + yylex_init(&state->scanner); + + yyset_extra(state, state->scanner); + + psql_scan_reset(state); + + return state; +} + +/* + * Destroy a lexer working state struct, releasing all resources. + */ +void +psql_scan_destroy(PsqlScanState state) +{ + psql_scan_finish(state); + + psql_scan_reset(state); + + yylex_destroy(state->scanner); + + free(state); +} + +/* + * Set the callback passthrough pointer for the lexer. + * + * This could have been integrated into psql_scan_create, but keeping it + * separate allows the application to change the pointer later, which might + * be useful. + */ +void +psql_scan_set_passthrough(PsqlScanState state, void *passthrough) +{ + state->cb_passthrough = passthrough; +} + +/* + * Set up to perform lexing of the given input line. + * + * The text at *line, extending for line_len bytes, will be scanned by + * subsequent calls to the psql_scan routines. psql_scan_finish should + * be called when scanning is complete. Note that the lexer retains + * a pointer to the storage at *line --- this string must not be altered + * or freed until after psql_scan_finish is called. + * + * encoding is the libpq identifier for the character encoding in use, + * and std_strings says whether standard_conforming_strings is on. + */ +void +psql_scan_setup(PsqlScanState state, + const char *line, int line_len, + int encoding, bool std_strings) +{ + /* Mustn't be scanning already */ + Assert(state->scanbufhandle == NULL); + Assert(state->buffer_stack == NULL); + + /* Do we need to hack the character set encoding? */ + state->encoding = encoding; + state->safe_encoding = pg_valid_server_encoding_id(encoding); + + /* Save standard-strings flag as well */ + state->std_strings = std_strings; + + /* Set up flex input buffer with appropriate translation and padding */ + state->scanbufhandle = psqlscan_prepare_buffer(state, line, line_len, + &state->scanbuf); + state->scanline = line; + + /* Set lookaside data in case we have to map unsafe encoding */ + state->curline = state->scanbuf; + state->refline = state->scanline; +} + +/* + * Do lexical analysis of SQL command text. + * + * The text previously passed to psql_scan_setup is scanned, and appended + * (possibly with transformation) to query_buf. + * + * The return value indicates the condition that stopped scanning: + * + * PSCAN_SEMICOLON: found a command-ending semicolon. (The semicolon is + * transferred to query_buf.) The command accumulated in query_buf should + * be executed, then clear query_buf and call again to scan the remainder + * of the line. + * + * PSCAN_BACKSLASH: found a backslash that starts a special command. + * Any previous data on the line has been transferred to query_buf. + * The caller will typically next apply a separate flex lexer to scan + * the special command. + * + * PSCAN_INCOMPLETE: the end of the line was reached, but we have an + * incomplete SQL command. *prompt is set to the appropriate prompt type. + * + * PSCAN_EOL: the end of the line was reached, and there is no lexical + * reason to consider the command incomplete. The caller may or may not + * choose to send it. *prompt is set to the appropriate prompt type if + * the caller chooses to collect more input. + * + * In the PSCAN_INCOMPLETE and PSCAN_EOL cases, psql_scan_finish() should + * be called next, then the cycle may be repeated with a fresh input line. + * + * In all cases, *prompt is set to an appropriate prompt type code for the + * next line-input operation. + */ +PsqlScanResult +psql_scan(PsqlScanState state, + PQExpBuffer query_buf, + promptStatus_t *prompt) +{ + PsqlScanResult result; + int lexresult; + + /* Must be scanning already */ + Assert(state->scanbufhandle != NULL); + + /* Set current output target */ + state->output_buf = query_buf; + + /* Set input source */ + if (state->buffer_stack != NULL) + yy_switch_to_buffer(state->buffer_stack->buf, state->scanner); + else + yy_switch_to_buffer(state->scanbufhandle, state->scanner); + + /* And lex. */ + lexresult = yylex(NULL, state->scanner); + + /* + * Check termination state and return appropriate result info. + */ + switch (lexresult) + { + case LEXRES_EOL: /* end of input */ + switch (state->start_state) + { + case INITIAL: + case xqs: /* we treat this like INITIAL */ + if (state->paren_depth > 0) + { + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_PAREN; + } + else if (query_buf->len > 0) + { + result = PSCAN_EOL; + *prompt = PROMPT_CONTINUE; + } + else + { + /* never bother to send an empty buffer */ + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_READY; + } + break; + case xb: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_SINGLEQUOTE; + break; + case xc: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_COMMENT; + break; + case xd: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_DOUBLEQUOTE; + break; + case xh: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_SINGLEQUOTE; + break; + case xe: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_SINGLEQUOTE; + break; + case xq: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_SINGLEQUOTE; + break; + case xdolq: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_DOLLARQUOTE; + break; + case xui: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_DOUBLEQUOTE; + break; + case xus: + result = PSCAN_INCOMPLETE; + *prompt = PROMPT_SINGLEQUOTE; + break; + default: + /* can't get here */ + fprintf(stderr, "invalid YY_START\n"); + exit(1); + } + break; + case LEXRES_SEMI: /* semicolon */ + result = PSCAN_SEMICOLON; + *prompt = PROMPT_READY; + break; + case LEXRES_BACKSLASH: /* backslash */ + result = PSCAN_BACKSLASH; + *prompt = PROMPT_READY; + break; + default: + /* can't get here */ + fprintf(stderr, "invalid yylex result\n"); + exit(1); + } + + return result; +} + +/* + * Clean up after scanning a string. This flushes any unread input and + * releases resources (but not the PsqlScanState itself). Note however + * that this does not reset the lexer scan state; that can be done by + * psql_scan_reset(), which is an orthogonal operation. + * + * It is legal to call this when not scanning anything (makes it easier + * to deal with error recovery). + */ +void +psql_scan_finish(PsqlScanState state) +{ + /* Drop any incomplete variable expansions. */ + while (state->buffer_stack != NULL) + psqlscan_pop_buffer_stack(state); + + /* Done with the outer scan buffer, too */ + if (state->scanbufhandle) + yy_delete_buffer(state->scanbufhandle, state->scanner); + state->scanbufhandle = NULL; + if (state->scanbuf) + free(state->scanbuf); + state->scanbuf = NULL; +} + +/* + * Reset lexer scanning state to start conditions. This is appropriate + * for executing \r psql commands (or any other time that we discard the + * prior contents of query_buf). It is not, however, necessary to do this + * when we execute and clear the buffer after getting a PSCAN_SEMICOLON or + * PSCAN_EOL scan result, because the scan state must be INITIAL when those + * conditions are returned. + * + * Note that this is unrelated to flushing unread input; that task is + * done by psql_scan_finish(). + */ +void +psql_scan_reset(PsqlScanState state) +{ + state->start_state = INITIAL; + state->paren_depth = 0; + state->xcdepth = 0; /* not really necessary */ + if (state->dolqstart) + free(state->dolqstart); + state->dolqstart = NULL; +} + +/* + * Reselect this lexer (psqlscan.l) after using another one. + * + * Currently and for foreseeable uses, it's sufficient to reset to INITIAL + * state, because we'd never switch to another lexer in a different state. + * However, we don't want to reset e.g. paren_depth, so this can't be + * the same as psql_scan_reset(). + * + * Note: psql setjmp error recovery just calls psql_scan_reset(), so that + * must be a superset of this. + * + * Note: it seems likely that other lexers could just assign INITIAL for + * themselves, since that probably has the value zero in every flex-generated + * lexer. But let's not assume that. + */ +void +psql_scan_reselect_sql_lexer(PsqlScanState state) +{ + state->start_state = INITIAL; +} + +/* + * Return true if lexer is currently in an "inside quotes" state. + * + * This is pretty grotty but is needed to preserve the old behavior + * that mainloop.c drops blank lines not inside quotes without even + * echoing them. + */ +bool +psql_scan_in_quote(PsqlScanState state) +{ + return state->start_state != INITIAL && + state->start_state != xqs; +} + +/* + * Push the given string onto the stack of stuff to scan. + * + * NOTE SIDE EFFECT: the new buffer is made the active flex input buffer. + */ +void +psqlscan_push_new_buffer(PsqlScanState state, const char *newstr, + const char *varname) +{ + StackElem *stackelem; + + stackelem = (StackElem *) pg_malloc(sizeof(StackElem)); + + /* + * In current usage, the passed varname points at the current flex input + * buffer; we must copy it before calling psqlscan_prepare_buffer() + * because that will change the buffer state. + */ + stackelem->varname = varname ? pg_strdup(varname) : NULL; + + stackelem->buf = psqlscan_prepare_buffer(state, newstr, strlen(newstr), + &stackelem->bufstring); + state->curline = stackelem->bufstring; + if (state->safe_encoding) + { + stackelem->origstring = NULL; + state->refline = stackelem->bufstring; + } + else + { + stackelem->origstring = pg_strdup(newstr); + state->refline = stackelem->origstring; + } + stackelem->next = state->buffer_stack; + state->buffer_stack = stackelem; +} + +/* + * Pop the topmost buffer stack item (there must be one!) + * + * NB: after this, the flex input state is unspecified; caller must + * switch to an appropriate buffer to continue lexing. + * See psqlscan_select_top_buffer(). + */ +void +psqlscan_pop_buffer_stack(PsqlScanState state) +{ + StackElem *stackelem = state->buffer_stack; + + state->buffer_stack = stackelem->next; + yy_delete_buffer(stackelem->buf, state->scanner); + free(stackelem->bufstring); + if (stackelem->origstring) + free(stackelem->origstring); + if (stackelem->varname) + free(stackelem->varname); + free(stackelem); +} + +/* + * Select the topmost surviving buffer as the active input. + */ +void +psqlscan_select_top_buffer(PsqlScanState state) +{ + StackElem *stackelem = state->buffer_stack; + + if (stackelem != NULL) + { + yy_switch_to_buffer(stackelem->buf, state->scanner); + state->curline = stackelem->bufstring; + state->refline = stackelem->origstring ? stackelem->origstring : stackelem->bufstring; + } + else + { + yy_switch_to_buffer(state->scanbufhandle, state->scanner); + state->curline = state->scanbuf; + state->refline = state->scanline; + } +} + +/* + * Check if specified variable name is the source for any string + * currently being scanned + */ +bool +psqlscan_var_is_current_source(PsqlScanState state, const char *varname) +{ + StackElem *stackelem; + + for (stackelem = state->buffer_stack; + stackelem != NULL; + stackelem = stackelem->next) + { + if (stackelem->varname && strcmp(stackelem->varname, varname) == 0) + return true; + } + return false; +} + +/* + * Set up a flex input buffer to scan the given data. We always make a + * copy of the data. If working in an unsafe encoding, the copy has + * multibyte sequences replaced by FFs to avoid fooling the lexer rules. + * + * NOTE SIDE EFFECT: the new buffer is made the active flex input buffer. + */ +YY_BUFFER_STATE +psqlscan_prepare_buffer(PsqlScanState state, const char *txt, int len, + char **txtcopy) +{ + char *newtxt; + + /* Flex wants two \0 characters after the actual data */ + newtxt = pg_malloc(len + 2); + *txtcopy = newtxt; + newtxt[len] = newtxt[len + 1] = YY_END_OF_BUFFER_CHAR; + + if (state->safe_encoding) + memcpy(newtxt, txt, len); + else + { + /* Gotta do it the hard way */ + int i = 0; + + while (i < len) + { + int thislen = PQmblen(txt + i, state->encoding); + + /* first byte should always be okay... */ + newtxt[i] = txt[i]; + i++; + while (--thislen > 0 && i < len) + newtxt[i++] = (char) 0xFF; + } + } + + return yy_scan_buffer(newtxt, len + 2, state->scanner); +} + +/* + * psqlscan_emit() --- body for ECHO macro + * + * NB: this must be used for ALL and ONLY the text copied from the flex + * input data. If you pass it something that is not part of the yytext + * string, you are making a mistake. Internally generated text can be + * appended directly to state->output_buf. + */ +void +psqlscan_emit(PsqlScanState state, const char *txt, int len) +{ + PQExpBuffer output_buf = state->output_buf; + + if (state->safe_encoding) + appendBinaryPQExpBuffer(output_buf, txt, len); + else + { + /* Gotta do it the hard way */ + const char *reference = state->refline; + int i; + + reference += (txt - state->curline); + + for (i = 0; i < len; i++) + { + char ch = txt[i]; + + if (ch == (char) 0xFF) + ch = reference[i]; + appendPQExpBufferChar(output_buf, ch); + } + } +} + +/* + * psqlscan_extract_substring --- fetch value of (part of) the current token + * + * This is like psqlscan_emit(), except that the data is returned as a + * malloc'd string rather than being pushed directly to state->output_buf. + */ +char * +psqlscan_extract_substring(PsqlScanState state, const char *txt, int len) +{ + char *result = (char *) pg_malloc(len + 1); + + if (state->safe_encoding) + memcpy(result, txt, len); + else + { + /* Gotta do it the hard way */ + const char *reference = state->refline; + int i; + + reference += (txt - state->curline); + + for (i = 0; i < len; i++) + { + char ch = txt[i]; + + if (ch == (char) 0xFF) + ch = reference[i]; + result[i] = ch; + } + } + result[len] = '\0'; + return result; +} + +/* + * psqlscan_escape_variable --- process :'VARIABLE' or :"VARIABLE" + * + * If the variable name is found, escape its value using the appropriate + * quoting method and emit the value to output_buf. (Since the result is + * surely quoted, there is never any reason to rescan it.) If we don't + * find the variable or escaping fails, emit the token as-is. + */ +void +psqlscan_escape_variable(PsqlScanState state, const char *txt, int len, + PsqlScanQuoteType quote) +{ + char *varname; + char *value; + + /* Variable lookup. */ + varname = psqlscan_extract_substring(state, txt + 2, len - 3); + if (state->callbacks->get_variable) + value = state->callbacks->get_variable(varname, quote, + state->cb_passthrough); + else + value = NULL; + free(varname); + + if (value) + { + /* Emit the suitably-escaped value */ + appendPQExpBufferStr(state->output_buf, value); + free(value); + } + else + { + /* Emit original token as-is */ + psqlscan_emit(state, txt, len); + } +} + +void +psqlscan_test_variable(PsqlScanState state, const char *txt, int len) +{ + char *varname; + char *value; + + varname = psqlscan_extract_substring(state, txt + 3, len - 4); + if (state->callbacks->get_variable) + value = state->callbacks->get_variable(varname, PQUOTE_PLAIN, + state->cb_passthrough); + else + value = NULL; + free(varname); + + if (value != NULL) + { + psqlscan_emit(state, "TRUE", 4); + free(value); + } + else + { + psqlscan_emit(state, "FALSE", 5); + } +} diff --git a/src/fe_utils/recovery_gen.c b/src/fe_utils/recovery_gen.c new file mode 100644 index 0000000..46ca20e --- /dev/null +++ b/src/fe_utils/recovery_gen.c @@ -0,0 +1,175 @@ +/*------------------------------------------------------------------------- + * + * recovery_gen.c + * Generator for recovery configuration + * + * Portions Copyright (c) 2011-2020, PostgreSQL Global Development Group + * + *------------------------------------------------------------------------- + */ +#include "postgres_fe.h" + +#include "common/logging.h" +#include "fe_utils/recovery_gen.h" +#include "fe_utils/string_utils.h" + +static char *escape_quotes(const char *src); + +/* + * Write recovery configuration contents into a fresh PQExpBuffer, and + * return it. + */ +PQExpBuffer +GenerateRecoveryConfig(PGconn *pgconn, char *replication_slot) +{ + PQconninfoOption *connOptions; + PQExpBufferData conninfo_buf; + char *escaped; + PQExpBuffer contents; + + Assert(pgconn != NULL); + + contents = createPQExpBuffer(); + if (!contents) + { + pg_log_error("out of memory"); + exit(1); + } + + /* + * In PostgreSQL 12 and newer versions, standby_mode is gone, replaced by + * standby.signal to trigger a standby state at recovery. + */ + if (PQserverVersion(pgconn) < MINIMUM_VERSION_FOR_RECOVERY_GUC) + appendPQExpBufferStr(contents, "standby_mode = 'on'\n"); + + connOptions = PQconninfo(pgconn); + if (connOptions == NULL) + { + pg_log_error("out of memory"); + exit(1); + } + + initPQExpBuffer(&conninfo_buf); + for (PQconninfoOption *opt = connOptions; opt && opt->keyword; opt++) + { + /* Omit empty settings and those libpqwalreceiver overrides. */ + if (strcmp(opt->keyword, "replication") == 0 || + strcmp(opt->keyword, "dbname") == 0 || + strcmp(opt->keyword, "fallback_application_name") == 0 || + (opt->val == NULL) || + (opt->val != NULL && opt->val[0] == '\0')) + continue; + + /* Separate key-value pairs with spaces */ + if (conninfo_buf.len != 0) + appendPQExpBufferChar(&conninfo_buf, ' '); + + /* + * Write "keyword=value" pieces, the value string is escaped and/or + * quoted if necessary. + */ + appendPQExpBuffer(&conninfo_buf, "%s=", opt->keyword); + appendConnStrVal(&conninfo_buf, opt->val); + } + if (PQExpBufferDataBroken(conninfo_buf)) + { + pg_log_error("out of memory"); + exit(1); + } + + /* + * Escape the connection string, so that it can be put in the config file. + * Note that this is different from the escaping of individual connection + * options above! + */ + escaped = escape_quotes(conninfo_buf.data); + termPQExpBuffer(&conninfo_buf); + appendPQExpBuffer(contents, "primary_conninfo = '%s'\n", escaped); + free(escaped); + + if (replication_slot) + { + /* unescaped: ReplicationSlotValidateName allows [a-z0-9_] only */ + appendPQExpBuffer(contents, "primary_slot_name = '%s'\n", + replication_slot); + } + + if (PQExpBufferBroken(contents)) + { + pg_log_error("out of memory"); + exit(1); + } + + PQconninfoFree(connOptions); + + return contents; +} + +/* + * Write the configuration file in the directory specified in target_dir, + * with the contents already collected in memory appended. Then write + * the signal file into the target_dir. If the server does not support + * recovery parameters as GUCs, the signal file is not necessary, and + * configuration is written to recovery.conf. + */ +void +WriteRecoveryConfig(PGconn *pgconn, char *target_dir, PQExpBuffer contents) +{ + char filename[MAXPGPATH]; + FILE *cf; + bool use_recovery_conf; + + Assert(pgconn != NULL); + + use_recovery_conf = + PQserverVersion(pgconn) < MINIMUM_VERSION_FOR_RECOVERY_GUC; + + snprintf(filename, MAXPGPATH, "%s/%s", target_dir, + use_recovery_conf ? "recovery.conf" : "postgresql.auto.conf"); + + cf = fopen(filename, use_recovery_conf ? "w" : "a"); + if (cf == NULL) + { + pg_log_error("could not open file \"%s\": %m", filename); + exit(1); + } + + if (fwrite(contents->data, contents->len, 1, cf) != 1) + { + pg_log_error("could not write to file \"%s\": %m", filename); + exit(1); + } + + fclose(cf); + + if (!use_recovery_conf) + { + snprintf(filename, MAXPGPATH, "%s/%s", target_dir, "standby.signal"); + cf = fopen(filename, "w"); + if (cf == NULL) + { + pg_log_error("could not create file \"%s\": %m", filename); + exit(1); + } + + fclose(cf); + } +} + +/* + * Escape a string so that it can be used as a value in a key-value pair + * a configuration file. + */ +static char * +escape_quotes(const char *src) +{ + char *result = escape_single_quotes_ascii(src); + + if (!result) + { + pg_log_error("out of memory"); + exit(1); + } + return result; +} diff --git a/src/fe_utils/simple_list.c b/src/fe_utils/simple_list.c new file mode 100644 index 0000000..5294fba --- /dev/null +++ b/src/fe_utils/simple_list.c @@ -0,0 +1,175 @@ +/*------------------------------------------------------------------------- + * + * Simple list facilities for frontend code + * + * Data structures for simple lists of OIDs and strings. The support for + * these is very primitive compared to the backend's List facilities, but + * it's all we need in, eg, pg_dump. + * + * + * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * src/fe_utils/simple_list.c + * + *------------------------------------------------------------------------- + */ +#include "postgres_fe.h" + +#include "fe_utils/simple_list.h" + + +/* + * Append an OID to the list. + */ +void +simple_oid_list_append(SimpleOidList *list, Oid val) +{ + SimpleOidListCell *cell; + + cell = (SimpleOidListCell *) pg_malloc(sizeof(SimpleOidListCell)); + cell->next = NULL; + cell->val = val; + + if (list->tail) + list->tail->next = cell; + else + list->head = cell; + list->tail = cell; +} + +/* + * Is OID present in the list? + */ +bool +simple_oid_list_member(SimpleOidList *list, Oid val) +{ + SimpleOidListCell *cell; + + for (cell = list->head; cell; cell = cell->next) + { + if (cell->val == val) + return true; + } + return false; +} + +/* + * Append a string to the list. + * + * The given string is copied, so it need not survive past the call. + */ +void +simple_string_list_append(SimpleStringList *list, const char *val) +{ + SimpleStringListCell *cell; + + cell = (SimpleStringListCell *) + pg_malloc(offsetof(SimpleStringListCell, val) + strlen(val) + 1); + + cell->next = NULL; + cell->touched = false; + strcpy(cell->val, val); + + if (list->tail) + list->tail->next = cell; + else + list->head = cell; + list->tail = cell; +} + +/* + * Is string present in the list? + * + * If found, the "touched" field of the first match is set true. + */ +bool +simple_string_list_member(SimpleStringList *list, const char *val) +{ + SimpleStringListCell *cell; + + for (cell = list->head; cell; cell = cell->next) + { + if (strcmp(cell->val, val) == 0) + { + cell->touched = true; + return true; + } + } + return false; +} + +/* + * Destroy an OID list + */ +void +simple_oid_list_destroy(SimpleOidList *list) +{ + SimpleOidListCell *cell; + + cell = list->head; + while (cell != NULL) + { + SimpleOidListCell *next; + + next = cell->next; + pg_free(cell); + cell = next; + } +} + +/* + * Destroy a string list + */ +void +simple_string_list_destroy(SimpleStringList *list) +{ + SimpleStringListCell *cell; + + cell = list->head; + while (cell != NULL) + { + SimpleStringListCell *next; + + next = cell->next; + pg_free(cell); + cell = next; + } +} + +/* + * Find first not-touched list entry, if there is one. + */ +const char * +simple_string_list_not_touched(SimpleStringList *list) +{ + SimpleStringListCell *cell; + + for (cell = list->head; cell; cell = cell->next) + { + if (!cell->touched) + return cell->val; + } + return NULL; +} + +/* + * Append a pointer to the list. + * + * Caller must ensure that the pointer remains valid. + */ +void +simple_ptr_list_append(SimplePtrList *list, void *ptr) +{ + SimplePtrListCell *cell; + + cell = (SimplePtrListCell *) pg_malloc(sizeof(SimplePtrListCell)); + cell->next = NULL; + cell->ptr = ptr; + + if (list->tail) + list->tail->next = cell; + else + list->head = cell; + list->tail = cell; +} diff --git a/src/fe_utils/string_utils.c b/src/fe_utils/string_utils.c new file mode 100644 index 0000000..b4bba26 --- /dev/null +++ b/src/fe_utils/string_utils.c @@ -0,0 +1,1029 @@ +/*------------------------------------------------------------------------- + * + * String-processing utility routines for frontend code + * + * Assorted utility functions that are useful in constructing SQL queries + * and interpreting backend output. + * + * + * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * src/fe_utils/string_utils.c + * + *------------------------------------------------------------------------- + */ +#include "postgres_fe.h" + +#include <ctype.h> + +#include "common/keywords.h" +#include "fe_utils/string_utils.h" + +static PQExpBuffer defaultGetLocalPQExpBuffer(void); + +/* Globals exported by this file */ +int quote_all_identifiers = 0; +PQExpBuffer (*getLocalPQExpBuffer) (void) = defaultGetLocalPQExpBuffer; + + +/* + * Returns a temporary PQExpBuffer, valid until the next call to the function. + * This is used by fmtId and fmtQualifiedId. + * + * Non-reentrant and non-thread-safe but reduces memory leakage. You can + * replace this with a custom version by setting the getLocalPQExpBuffer + * function pointer. + */ +static PQExpBuffer +defaultGetLocalPQExpBuffer(void) +{ + static PQExpBuffer id_return = NULL; + + if (id_return) /* first time through? */ + { + /* same buffer, just wipe contents */ + resetPQExpBuffer(id_return); + } + else + { + /* new buffer */ + id_return = createPQExpBuffer(); + } + + return id_return; +} + +/* + * Quotes input string if it's not a legitimate SQL identifier as-is. + * + * Note that the returned string must be used before calling fmtId again, + * since we re-use the same return buffer each time. + */ +const char * +fmtId(const char *rawid) +{ + PQExpBuffer id_return = getLocalPQExpBuffer(); + + const char *cp; + bool need_quotes = false; + + /* + * These checks need to match the identifier production in scan.l. Don't + * use islower() etc. + */ + if (quote_all_identifiers) + need_quotes = true; + /* slightly different rules for first character */ + else if (!((rawid[0] >= 'a' && rawid[0] <= 'z') || rawid[0] == '_')) + need_quotes = true; + else + { + /* otherwise check the entire string */ + for (cp = rawid; *cp; cp++) + { + if (!((*cp >= 'a' && *cp <= 'z') + || (*cp >= '0' && *cp <= '9') + || (*cp == '_'))) + { + need_quotes = true; + break; + } + } + } + + if (!need_quotes) + { + /* + * Check for keyword. We quote keywords except for unreserved ones. + * (In some cases we could avoid quoting a col_name or type_func_name + * keyword, but it seems much harder than it's worth to tell that.) + * + * Note: ScanKeywordLookup() does case-insensitive comparison, but + * that's fine, since we already know we have all-lower-case. + */ + int kwnum = ScanKeywordLookup(rawid, &ScanKeywords); + + if (kwnum >= 0 && ScanKeywordCategories[kwnum] != UNRESERVED_KEYWORD) + need_quotes = true; + } + + if (!need_quotes) + { + /* no quoting needed */ + appendPQExpBufferStr(id_return, rawid); + } + else + { + appendPQExpBufferChar(id_return, '"'); + for (cp = rawid; *cp; cp++) + { + /* + * Did we find a double-quote in the string? Then make this a + * double double-quote per SQL99. Before, we put in a + * backslash/double-quote pair. - thomas 2000-08-05 + */ + if (*cp == '"') + appendPQExpBufferChar(id_return, '"'); + appendPQExpBufferChar(id_return, *cp); + } + appendPQExpBufferChar(id_return, '"'); + } + + return id_return->data; +} + +/* + * fmtQualifiedId - construct a schema-qualified name, with quoting as needed. + * + * Like fmtId, use the result before calling again. + * + * Since we call fmtId and it also uses getLocalPQExpBuffer() we cannot + * use that buffer until we're finished with calling fmtId(). + */ +const char * +fmtQualifiedId(const char *schema, const char *id) +{ + PQExpBuffer id_return; + PQExpBuffer lcl_pqexp = createPQExpBuffer(); + + /* Some callers might fail to provide a schema name */ + if (schema && *schema) + { + appendPQExpBuffer(lcl_pqexp, "%s.", fmtId(schema)); + } + appendPQExpBufferStr(lcl_pqexp, fmtId(id)); + + id_return = getLocalPQExpBuffer(); + + appendPQExpBufferStr(id_return, lcl_pqexp->data); + destroyPQExpBuffer(lcl_pqexp); + + return id_return->data; +} + + +/* + * Format a Postgres version number (in the PG_VERSION_NUM integer format + * returned by PQserverVersion()) as a string. This exists mainly to + * encapsulate knowledge about two-part vs. three-part version numbers. + * + * For reentrancy, caller must supply the buffer the string is put in. + * Recommended size of the buffer is 32 bytes. + * + * Returns address of 'buf', as a notational convenience. + */ +char * +formatPGVersionNumber(int version_number, bool include_minor, + char *buf, size_t buflen) +{ + if (version_number >= 100000) + { + /* New two-part style */ + if (include_minor) + snprintf(buf, buflen, "%d.%d", version_number / 10000, + version_number % 10000); + else + snprintf(buf, buflen, "%d", version_number / 10000); + } + else + { + /* Old three-part style */ + if (include_minor) + snprintf(buf, buflen, "%d.%d.%d", version_number / 10000, + (version_number / 100) % 100, + version_number % 100); + else + snprintf(buf, buflen, "%d.%d", version_number / 10000, + (version_number / 100) % 100); + } + return buf; +} + + +/* + * Convert a string value to an SQL string literal and append it to + * the given buffer. We assume the specified client_encoding and + * standard_conforming_strings settings. + * + * This is essentially equivalent to libpq's PQescapeStringInternal, + * except for the output buffer structure. We need it in situations + * where we do not have a PGconn available. Where we do, + * appendStringLiteralConn is a better choice. + */ +void +appendStringLiteral(PQExpBuffer buf, const char *str, + int encoding, bool std_strings) +{ + size_t length = strlen(str); + const char *source = str; + char *target; + + if (!enlargePQExpBuffer(buf, 2 * length + 2)) + return; + + target = buf->data + buf->len; + *target++ = '\''; + + while (*source != '\0') + { + char c = *source; + int len; + int i; + + /* Fast path for plain ASCII */ + if (!IS_HIGHBIT_SET(c)) + { + /* Apply quoting if needed */ + if (SQL_STR_DOUBLE(c, !std_strings)) + *target++ = c; + /* Copy the character */ + *target++ = c; + source++; + continue; + } + + /* Slow path for possible multibyte characters */ + len = PQmblen(source, encoding); + + /* Copy the character */ + for (i = 0; i < len; i++) + { + if (*source == '\0') + break; + *target++ = *source++; + } + + /* + * If we hit premature end of string (ie, incomplete multibyte + * character), try to pad out to the correct length with spaces. We + * may not be able to pad completely, but we will always be able to + * insert at least one pad space (since we'd not have quoted a + * multibyte character). This should be enough to make a string that + * the server will error out on. + */ + if (i < len) + { + char *stop = buf->data + buf->maxlen - 2; + + for (; i < len; i++) + { + if (target >= stop) + break; + *target++ = ' '; + } + break; + } + } + + /* Write the terminating quote and NUL character. */ + *target++ = '\''; + *target = '\0'; + + buf->len = target - buf->data; +} + + +/* + * Convert a string value to an SQL string literal and append it to + * the given buffer. Encoding and string syntax rules are as indicated + * by current settings of the PGconn. + */ +void +appendStringLiteralConn(PQExpBuffer buf, const char *str, PGconn *conn) +{ + size_t length = strlen(str); + + /* + * XXX This is a kluge to silence escape_string_warning in our utility + * programs. It should go away someday. + */ + if (strchr(str, '\\') != NULL && PQserverVersion(conn) >= 80100) + { + /* ensure we are not adjacent to an identifier */ + if (buf->len > 0 && buf->data[buf->len - 1] != ' ') + appendPQExpBufferChar(buf, ' '); + appendPQExpBufferChar(buf, ESCAPE_STRING_SYNTAX); + appendStringLiteral(buf, str, PQclientEncoding(conn), false); + return; + } + /* XXX end kluge */ + + if (!enlargePQExpBuffer(buf, 2 * length + 2)) + return; + appendPQExpBufferChar(buf, '\''); + buf->len += PQescapeStringConn(conn, buf->data + buf->len, + str, length, NULL); + appendPQExpBufferChar(buf, '\''); +} + + +/* + * Convert a string value to a dollar quoted literal and append it to + * the given buffer. If the dqprefix parameter is not NULL then the + * dollar quote delimiter will begin with that (after the opening $). + * + * No escaping is done at all on str, in compliance with the rules + * for parsing dollar quoted strings. Also, we need not worry about + * encoding issues. + */ +void +appendStringLiteralDQ(PQExpBuffer buf, const char *str, const char *dqprefix) +{ + static const char suffixes[] = "_XXXXXXX"; + int nextchar = 0; + PQExpBuffer delimBuf = createPQExpBuffer(); + + /* start with $ + dqprefix if not NULL */ + appendPQExpBufferChar(delimBuf, '$'); + if (dqprefix) + appendPQExpBufferStr(delimBuf, dqprefix); + + /* + * Make sure we choose a delimiter which (without the trailing $) is not + * present in the string being quoted. We don't check with the trailing $ + * because a string ending in $foo must not be quoted with $foo$. + */ + while (strstr(str, delimBuf->data) != NULL) + { + appendPQExpBufferChar(delimBuf, suffixes[nextchar++]); + nextchar %= sizeof(suffixes) - 1; + } + + /* add trailing $ */ + appendPQExpBufferChar(delimBuf, '$'); + + /* quote it and we are all done */ + appendPQExpBufferStr(buf, delimBuf->data); + appendPQExpBufferStr(buf, str); + appendPQExpBufferStr(buf, delimBuf->data); + + destroyPQExpBuffer(delimBuf); +} + + +/* + * Convert a bytea value (presented as raw bytes) to an SQL string literal + * and append it to the given buffer. We assume the specified + * standard_conforming_strings setting. + * + * This is needed in situations where we do not have a PGconn available. + * Where we do, PQescapeByteaConn is a better choice. + */ +void +appendByteaLiteral(PQExpBuffer buf, const unsigned char *str, size_t length, + bool std_strings) +{ + const unsigned char *source = str; + char *target; + + static const char hextbl[] = "0123456789abcdef"; + + /* + * This implementation is hard-wired to produce hex-format output. We do + * not know the server version the output will be loaded into, so making + * an intelligent format choice is impossible. It might be better to + * always use the old escaped format. + */ + if (!enlargePQExpBuffer(buf, 2 * length + 5)) + return; + + target = buf->data + buf->len; + *target++ = '\''; + if (!std_strings) + *target++ = '\\'; + *target++ = '\\'; + *target++ = 'x'; + + while (length-- > 0) + { + unsigned char c = *source++; + + *target++ = hextbl[(c >> 4) & 0xF]; + *target++ = hextbl[c & 0xF]; + } + + /* Write the terminating quote and NUL character. */ + *target++ = '\''; + *target = '\0'; + + buf->len = target - buf->data; +} + + +/* + * Append the given string to the shell command being built in the buffer, + * with shell-style quoting as needed to create exactly one argument. + * + * Forbid LF or CR characters, which have scant practical use beyond designing + * security breaches. The Windows command shell is unusable as a conduit for + * arguments containing LF or CR characters. A future major release should + * reject those characters in CREATE ROLE and CREATE DATABASE, because use + * there eventually leads to errors here. + * + * appendShellString() simply prints an error and dies if LF or CR appears. + * appendShellStringNoError() omits those characters from the result, and + * returns false if there were any. + */ +void +appendShellString(PQExpBuffer buf, const char *str) +{ + if (!appendShellStringNoError(buf, str)) + { + fprintf(stderr, + _("shell command argument contains a newline or carriage return: \"%s\"\n"), + str); + exit(EXIT_FAILURE); + } +} + +bool +appendShellStringNoError(PQExpBuffer buf, const char *str) +{ +#ifdef WIN32 + int backslash_run_length = 0; +#endif + bool ok = true; + const char *p; + + /* + * Don't bother with adding quotes if the string is nonempty and clearly + * contains only safe characters. + */ + if (*str != '\0' && + strspn(str, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_./:") == strlen(str)) + { + appendPQExpBufferStr(buf, str); + return ok; + } + +#ifndef WIN32 + appendPQExpBufferChar(buf, '\''); + for (p = str; *p; p++) + { + if (*p == '\n' || *p == '\r') + { + ok = false; + continue; + } + + if (*p == '\'') + appendPQExpBufferStr(buf, "'\"'\"'"); + else + appendPQExpBufferChar(buf, *p); + } + appendPQExpBufferChar(buf, '\''); +#else /* WIN32 */ + + /* + * A Windows system() argument experiences two layers of interpretation. + * First, cmd.exe interprets the string. Its behavior is undocumented, + * but a caret escapes any byte except LF or CR that would otherwise have + * special meaning. Handling of a caret before LF or CR differs between + * "cmd.exe /c" and other modes, and it is unusable here. + * + * Second, the new process parses its command line to construct argv (see + * https://msdn.microsoft.com/en-us/library/17w5ykft.aspx). This treats + * backslash-double quote sequences specially. + */ + appendPQExpBufferStr(buf, "^\""); + for (p = str; *p; p++) + { + if (*p == '\n' || *p == '\r') + { + ok = false; + continue; + } + + /* Change N backslashes before a double quote to 2N+1 backslashes. */ + if (*p == '"') + { + while (backslash_run_length) + { + appendPQExpBufferStr(buf, "^\\"); + backslash_run_length--; + } + appendPQExpBufferStr(buf, "^\\"); + } + else if (*p == '\\') + backslash_run_length++; + else + backslash_run_length = 0; + + /* + * Decline to caret-escape the most mundane characters, to ease + * debugging and lest we approach the command length limit. + */ + if (!((*p >= 'a' && *p <= 'z') || + (*p >= 'A' && *p <= 'Z') || + (*p >= '0' && *p <= '9'))) + appendPQExpBufferChar(buf, '^'); + appendPQExpBufferChar(buf, *p); + } + + /* + * Change N backslashes at end of argument to 2N backslashes, because they + * precede the double quote that terminates the argument. + */ + while (backslash_run_length) + { + appendPQExpBufferStr(buf, "^\\"); + backslash_run_length--; + } + appendPQExpBufferStr(buf, "^\""); +#endif /* WIN32 */ + + return ok; +} + + +/* + * Append the given string to the buffer, with suitable quoting for passing + * the string as a value in a keyword/value pair in a libpq connection string. + */ +void +appendConnStrVal(PQExpBuffer buf, const char *str) +{ + const char *s; + bool needquotes; + + /* + * If the string is one or more plain ASCII characters, no need to quote + * it. This is quite conservative, but better safe than sorry. + */ + needquotes = true; + for (s = str; *s; s++) + { + if (!((*s >= 'a' && *s <= 'z') || (*s >= 'A' && *s <= 'Z') || + (*s >= '0' && *s <= '9') || *s == '_' || *s == '.')) + { + needquotes = true; + break; + } + needquotes = false; + } + + if (needquotes) + { + appendPQExpBufferChar(buf, '\''); + while (*str) + { + /* ' and \ must be escaped by to \' and \\ */ + if (*str == '\'' || *str == '\\') + appendPQExpBufferChar(buf, '\\'); + + appendPQExpBufferChar(buf, *str); + str++; + } + appendPQExpBufferChar(buf, '\''); + } + else + appendPQExpBufferStr(buf, str); +} + + +/* + * Append a psql meta-command that connects to the given database with the + * then-current connection's user, host and port. + */ +void +appendPsqlMetaConnect(PQExpBuffer buf, const char *dbname) +{ + const char *s; + bool complex; + + /* + * If the name is plain ASCII characters, emit a trivial "\connect "foo"". + * For other names, even many not technically requiring it, skip to the + * general case. No database has a zero-length name. + */ + complex = false; + + for (s = dbname; *s; s++) + { + if (*s == '\n' || *s == '\r') + { + fprintf(stderr, + _("database name contains a newline or carriage return: \"%s\"\n"), + dbname); + exit(EXIT_FAILURE); + } + + if (!((*s >= 'a' && *s <= 'z') || (*s >= 'A' && *s <= 'Z') || + (*s >= '0' && *s <= '9') || *s == '_' || *s == '.')) + { + complex = true; + } + } + + appendPQExpBufferStr(buf, "\\connect "); + if (complex) + { + PQExpBufferData connstr; + + initPQExpBuffer(&connstr); + appendPQExpBufferStr(&connstr, "dbname="); + appendConnStrVal(&connstr, dbname); + + appendPQExpBufferStr(buf, "-reuse-previous=on "); + + /* + * As long as the name does not contain a newline, SQL identifier + * quoting satisfies the psql meta-command parser. Prefer not to + * involve psql-interpreted single quotes, which behaved differently + * before PostgreSQL 9.2. + */ + appendPQExpBufferStr(buf, fmtId(connstr.data)); + + termPQExpBuffer(&connstr); + } + else + appendPQExpBufferStr(buf, fmtId(dbname)); + appendPQExpBufferChar(buf, '\n'); +} + + +/* + * Deconstruct the text representation of a 1-dimensional Postgres array + * into individual items. + * + * On success, returns true and sets *itemarray and *nitems to describe + * an array of individual strings. On parse failure, returns false; + * *itemarray may exist or be NULL. + * + * NOTE: free'ing itemarray is sufficient to deallocate the working storage. + */ +bool +parsePGArray(const char *atext, char ***itemarray, int *nitems) +{ + int inputlen; + char **items; + char *strings; + int curitem; + + /* + * We expect input in the form of "{item,item,item}" where any item is + * either raw data, or surrounded by double quotes (in which case embedded + * characters including backslashes and quotes are backslashed). + * + * We build the result as an array of pointers followed by the actual + * string data, all in one malloc block for convenience of deallocation. + * The worst-case storage need is not more than one pointer and one + * character for each input character (consider "{,,,,,,,,,,}"). + */ + *itemarray = NULL; + *nitems = 0; + inputlen = strlen(atext); + if (inputlen < 2 || atext[0] != '{' || atext[inputlen - 1] != '}') + return false; /* bad input */ + items = (char **) malloc(inputlen * (sizeof(char *) + sizeof(char))); + if (items == NULL) + return false; /* out of memory */ + *itemarray = items; + strings = (char *) (items + inputlen); + + atext++; /* advance over initial '{' */ + curitem = 0; + while (*atext != '}') + { + if (*atext == '\0') + return false; /* premature end of string */ + items[curitem] = strings; + while (*atext != '}' && *atext != ',') + { + if (*atext == '\0') + return false; /* premature end of string */ + if (*atext != '"') + *strings++ = *atext++; /* copy unquoted data */ + else + { + /* process quoted substring */ + atext++; + while (*atext != '"') + { + if (*atext == '\0') + return false; /* premature end of string */ + if (*atext == '\\') + { + atext++; + if (*atext == '\0') + return false; /* premature end of string */ + } + *strings++ = *atext++; /* copy quoted data */ + } + atext++; + } + } + *strings++ = '\0'; + if (*atext == ',') + atext++; + curitem++; + } + if (atext[1] != '\0') + return false; /* bogus syntax (embedded '}') */ + *nitems = curitem; + return true; +} + + +/* + * Format a reloptions array and append it to the given buffer. + * + * "prefix" is prepended to the option names; typically it's "" or "toast.". + * + * Returns false if the reloptions array could not be parsed (in which case + * nothing will have been appended to the buffer), or true on success. + * + * Note: this logic should generally match the backend's flatten_reloptions() + * (in adt/ruleutils.c). + */ +bool +appendReloptionsArray(PQExpBuffer buffer, const char *reloptions, + const char *prefix, int encoding, bool std_strings) +{ + char **options; + int noptions; + int i; + + if (!parsePGArray(reloptions, &options, &noptions)) + { + if (options) + free(options); + return false; + } + + for (i = 0; i < noptions; i++) + { + char *option = options[i]; + char *name; + char *separator; + char *value; + + /* + * Each array element should have the form name=value. If the "=" is + * missing for some reason, treat it like an empty value. + */ + name = option; + separator = strchr(option, '='); + if (separator) + { + *separator = '\0'; + value = separator + 1; + } + else + value = ""; + + if (i > 0) + appendPQExpBufferStr(buffer, ", "); + appendPQExpBuffer(buffer, "%s%s=", prefix, fmtId(name)); + + /* + * In general we need to quote the value; but to avoid unnecessary + * clutter, do not quote if it is an identifier that would not need + * quoting. (We could also allow numbers, but that is a bit trickier + * than it looks --- for example, are leading zeroes significant? We + * don't want to assume very much here about what custom reloptions + * might mean.) + */ + if (strcmp(fmtId(value), value) == 0) + appendPQExpBufferStr(buffer, value); + else + appendStringLiteral(buffer, value, encoding, std_strings); + } + + if (options) + free(options); + + return true; +} + + +/* + * processSQLNamePattern + * + * Scan a wildcard-pattern string and generate appropriate WHERE clauses + * to limit the set of objects returned. The WHERE clauses are appended + * to the already-partially-constructed query in buf. Returns whether + * any clause was added. + * + * conn: connection query will be sent to (consulted for escaping rules). + * buf: output parameter. + * pattern: user-specified pattern option, or NULL if none ("*" is implied). + * have_where: true if caller already emitted "WHERE" (clauses will be ANDed + * onto the existing WHERE clause). + * force_escape: always quote regexp special characters, even outside + * double quotes (else they are quoted only between double quotes). + * schemavar: name of query variable to match against a schema-name pattern. + * Can be NULL if no schema. + * namevar: name of query variable to match against an object-name pattern. + * altnamevar: NULL, or name of an alternative variable to match against name. + * visibilityrule: clause to use if we want to restrict to visible objects + * (for example, "pg_catalog.pg_table_is_visible(p.oid)"). Can be NULL. + * + * Formatting note: the text already present in buf should end with a newline. + * The appended text, if any, will end with one too. + */ +bool +processSQLNamePattern(PGconn *conn, PQExpBuffer buf, const char *pattern, + bool have_where, bool force_escape, + const char *schemavar, const char *namevar, + const char *altnamevar, const char *visibilityrule) +{ + PQExpBufferData schemabuf; + PQExpBufferData namebuf; + int encoding = PQclientEncoding(conn); + bool inquotes; + const char *cp; + int i; + bool added_clause = false; + +#define WHEREAND() \ + (appendPQExpBufferStr(buf, have_where ? " AND " : "WHERE "), \ + have_where = true, added_clause = true) + + if (pattern == NULL) + { + /* Default: select all visible objects */ + if (visibilityrule) + { + WHEREAND(); + appendPQExpBuffer(buf, "%s\n", visibilityrule); + } + return added_clause; + } + + initPQExpBuffer(&schemabuf); + initPQExpBuffer(&namebuf); + + /* + * Parse the pattern, converting quotes and lower-casing unquoted letters. + * Also, adjust shell-style wildcard characters into regexp notation. + * + * We surround the pattern with "^(...)$" to force it to match the whole + * string, as per SQL practice. We have to have parens in case the string + * contains "|", else the "^" and "$" will be bound into the first and + * last alternatives which is not what we want. + * + * Note: the result of this pass is the actual regexp pattern(s) we want + * to execute. Quoting/escaping into SQL literal format will be done + * below using appendStringLiteralConn(). + */ + appendPQExpBufferStr(&namebuf, "^("); + + inquotes = false; + cp = pattern; + + while (*cp) + { + char ch = *cp; + + if (ch == '"') + { + if (inquotes && cp[1] == '"') + { + /* emit one quote, stay in inquotes mode */ + appendPQExpBufferChar(&namebuf, '"'); + cp++; + } + else + inquotes = !inquotes; + cp++; + } + else if (!inquotes && isupper((unsigned char) ch)) + { + appendPQExpBufferChar(&namebuf, + pg_tolower((unsigned char) ch)); + cp++; + } + else if (!inquotes && ch == '*') + { + appendPQExpBufferStr(&namebuf, ".*"); + cp++; + } + else if (!inquotes && ch == '?') + { + appendPQExpBufferChar(&namebuf, '.'); + cp++; + } + else if (!inquotes && ch == '.') + { + /* Found schema/name separator, move current pattern to schema */ + resetPQExpBuffer(&schemabuf); + appendPQExpBufferStr(&schemabuf, namebuf.data); + resetPQExpBuffer(&namebuf); + appendPQExpBufferStr(&namebuf, "^("); + cp++; + } + else if (ch == '$') + { + /* + * Dollar is always quoted, whether inside quotes or not. The + * reason is that it's allowed in SQL identifiers, so there's a + * significant use-case for treating it literally, while because + * we anchor the pattern automatically there is no use-case for + * having it possess its regexp meaning. + */ + appendPQExpBufferStr(&namebuf, "\\$"); + cp++; + } + else + { + /* + * Ordinary data character, transfer to pattern + * + * Inside double quotes, or at all times if force_escape is true, + * quote regexp special characters with a backslash to avoid + * regexp errors. Outside quotes, however, let them pass through + * as-is; this lets knowledgeable users build regexp expressions + * that are more powerful than shell-style patterns. + */ + if ((inquotes || force_escape) && + strchr("|*+?()[]{}.^$\\", ch)) + appendPQExpBufferChar(&namebuf, '\\'); + i = PQmblen(cp, encoding); + while (i-- && *cp) + { + appendPQExpBufferChar(&namebuf, *cp); + cp++; + } + } + } + + /* + * Now decide what we need to emit. We may run under a hostile + * search_path, so qualify EVERY name. Note there will be a leading "^(" + * in the patterns in any case. + * + * We want the regex matches to use the database's default collation where + * collation-sensitive behavior is required (for example, which characters + * match '\w'). That happened by default before PG v12, but if the server + * is >= v12 then we need to force it through explicit COLLATE clauses, + * otherwise the "C" collation attached to "name" catalog columns wins. + */ + if (namebuf.len > 2) + { + /* We have a name pattern, so constrain the namevar(s) */ + + appendPQExpBufferStr(&namebuf, ")$"); + /* Optimize away a "*" pattern */ + if (strcmp(namebuf.data, "^(.*)$") != 0) + { + WHEREAND(); + if (altnamevar) + { + appendPQExpBuffer(buf, + "(%s OPERATOR(pg_catalog.~) ", namevar); + appendStringLiteralConn(buf, namebuf.data, conn); + if (PQserverVersion(conn) >= 120000) + appendPQExpBufferStr(buf, " COLLATE pg_catalog.default"); + appendPQExpBuffer(buf, + "\n OR %s OPERATOR(pg_catalog.~) ", + altnamevar); + appendStringLiteralConn(buf, namebuf.data, conn); + if (PQserverVersion(conn) >= 120000) + appendPQExpBufferStr(buf, " COLLATE pg_catalog.default"); + appendPQExpBufferStr(buf, ")\n"); + } + else + { + appendPQExpBuffer(buf, "%s OPERATOR(pg_catalog.~) ", namevar); + appendStringLiteralConn(buf, namebuf.data, conn); + if (PQserverVersion(conn) >= 120000) + appendPQExpBufferStr(buf, " COLLATE pg_catalog.default"); + appendPQExpBufferChar(buf, '\n'); + } + } + } + + if (schemabuf.len > 2) + { + /* We have a schema pattern, so constrain the schemavar */ + + appendPQExpBufferStr(&schemabuf, ")$"); + /* Optimize away a "*" pattern */ + if (strcmp(schemabuf.data, "^(.*)$") != 0 && schemavar) + { + WHEREAND(); + appendPQExpBuffer(buf, "%s OPERATOR(pg_catalog.~) ", schemavar); + appendStringLiteralConn(buf, schemabuf.data, conn); + if (PQserverVersion(conn) >= 120000) + appendPQExpBufferStr(buf, " COLLATE pg_catalog.default"); + appendPQExpBufferChar(buf, '\n'); + } + } + else + { + /* No schema pattern given, so select only visible objects */ + if (visibilityrule) + { + WHEREAND(); + appendPQExpBuffer(buf, "%s\n", visibilityrule); + } + } + + termPQExpBuffer(&schemabuf); + termPQExpBuffer(&namebuf); + + return added_clause; +#undef WHEREAND +} |