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-rw-r--r--src/kash/input.c574
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diff --git a/src/kash/input.c b/src/kash/input.c
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+/* $NetBSD: input.c,v 1.39 2003/08/07 09:05:32 agc Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if 0
+#ifndef lint
+static char sccsid[] = "@(#)input.c 8.3 (Berkeley) 6/9/95";
+#else
+__RCSID("$NetBSD: input.c,v 1.39 2003/08/07 09:05:32 agc Exp $");
+#endif /* not lint */
+#endif
+
+#include <stdio.h> /* defines BUFSIZ */
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * This file implements the input routines used by the parser.
+ */
+
+#include "shell.h"
+#include "redir.h"
+#include "syntax.h"
+#include "input.h"
+#include "output.h"
+#include "options.h"
+#include "memalloc.h"
+#include "error.h"
+#include "alias.h"
+#include "parser.h"
+#include "myhistedit.h"
+#include "shinstance.h"
+
+#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
+
+//MKINIT
+//struct strpush {
+// struct strpush *prev; /* preceding string on stack */
+// char *prevstring;
+// int prevnleft;
+// int prevlleft;
+// struct alias *ap; /* if push was associated with an alias */
+//};
+//
+///*
+// * The parsefile structure pointed to by the global variable parsefile
+// * contains information about the current file being read.
+// */
+//
+//MKINIT
+//struct parsefile {
+// struct parsefile *prev; /* preceding file on stack */
+// int linno; /* current line */
+// int fd; /* file descriptor (or -1 if string) */
+// int nleft; /* number of chars left in this line */
+// int lleft; /* number of chars left in this buffer */
+// char *nextc; /* next char in buffer */
+// char *buf; /* input buffer */
+// struct strpush *strpush; /* for pushing strings at this level */
+// struct strpush basestrpush; /* so pushing one is fast */
+//};
+//
+//
+//int plinno = 1; /* input line number */
+//int parsenleft; /* copy of parsefile->nleft */
+//MKINIT int parselleft; /* copy of parsefile->lleft */
+//char *parsenextc; /* copy of parsefile->nextc */
+//MKINIT struct parsefile basepf; /* top level input file */
+//MKINIT char basebuf[BUFSIZ]; /* buffer for top level input file */
+//struct parsefile *parsefile = &basepf; /* current input file */
+//int init_editline = 0; /* editline library initialized? */
+//int whichprompt; /* 1 == PS1, 2 == PS2 */
+//
+//#ifndef SMALL
+//EditLine *el; /* cookie for editline package */
+//#endif
+
+STATIC void pushfile(shinstance *psh);
+static int preadfd(shinstance *psh);
+
+#ifdef mkinit
+INCLUDE <stdio.h>
+INCLUDE "input.h"
+INCLUDE "error.h"
+
+INIT {
+ psh->basepf.nextc = psh->basepf.buf = psh->basebuf;
+}
+
+RESET {
+ if (psh->exception != EXSHELLPROC)
+ psh->parselleft = psh->parsenleft = 0; /* clear input buffer */
+ popallfiles(psh);
+}
+
+SHELLPROC {
+ popallfiles(psh);
+}
+#endif
+
+
+/*
+ * Read a line from the script.
+ */
+
+char *
+pfgets(shinstance *psh, char *line, int len)
+{
+ char *p = line;
+ int nleft = len;
+ int c;
+
+ while (--nleft > 0) {
+ c = pgetc_macro(psh);
+ if (c == PEOF) {
+ if (p == line)
+ return NULL;
+ break;
+ }
+ *p++ = c;
+ if (c == '\n')
+ break;
+ }
+ *p = '\0';
+ return line;
+}
+
+
+
+/*
+ * Read a character from the script, returning PEOF on end of file.
+ * Nul characters in the input are silently discarded.
+ */
+
+int
+pgetc(shinstance *psh)
+{
+ return pgetc_macro(psh);
+}
+
+
+static int
+preadfd_inner(shinstance *psh, char *buf, int bufsize)
+{
+ int nr;
+retry:
+#ifndef SMALL
+ if (psh->parsefile->fd == 0 && psh->el) {
+ static const char *rl_cp;
+ static int el_len;
+
+ if (rl_cp == NULL)
+ rl_cp = el_gets(psh->el, &el_len);
+ if (rl_cp == NULL)
+ nr = 0;
+ else {
+ nr = el_len;
+ if (nr > bufsize)
+ nr = bufsize;
+ memcpy(buf, rl_cp, nr);
+ if (nr != el_len) {
+ el_len -= nr;
+ rl_cp += nr;
+ } else
+ rl_cp = 0;
+ }
+
+ } else
+#endif
+ nr = shfile_read(&psh->fdtab, psh->parsefile->fd, buf, bufsize);
+
+
+ if (nr <= 0) {
+ if (nr < 0) {
+ if (errno == EINTR)
+ goto retry;
+ if (psh->parsefile->fd == 0 && errno == EWOULDBLOCK) {
+ int flags = shfile_fcntl(&psh->fdtab, 0, F_GETFL, 0);
+ if (flags >= 0 && flags & O_NONBLOCK) {
+ flags &=~ O_NONBLOCK;
+ if (shfile_fcntl(&psh->fdtab, 0, F_SETFL, flags) >= 0) {
+ out2str(psh, "sh: turning off NDELAY mode\n");
+ goto retry;
+ }
+ }
+ }
+ }
+ nr = -1;
+ }
+ return nr;
+}
+
+
+
+static int
+preadfd(shinstance *psh)
+{
+ int nr;
+ char *buf = psh->parsefile->buf;
+ psh->parsenextc = buf;
+
+#ifdef SH_DEAL_WITH_CRLF
+ /* Convert CRLF to LF. */
+ nr = preadfd_inner(psh, buf, BUFSIZ - 9);
+ if (nr > 0) {
+ char *cr = memchr(buf, '\r', nr);
+ while (cr) {
+ size_t left = nr - (cr - buf);
+
+ if (left > 1 && cr[1] == '\n') {
+ left--;
+ nr--;
+ memmove(cr, cr + 1, left);
+ cr = memchr(cr, '\r', left);
+ } else if (left == 1) {
+ /* Special case: \r at buffer end. Read one more char. Screw \r\r\n sequences. */
+ int nr2 = preadfd_inner(psh, cr + 1, 1);
+ if (nr2 != 1)
+ break;
+ if (cr[1] == '\n') {
+ *cr = '\n';
+ } else {
+ nr++;
+ }
+ break;
+ } else {
+ cr = memchr(cr + 1, '\r', left);
+ }
+ }
+ }
+#else
+ nr = preadfd_inner(psh, buf, BUFSIZ - 8);
+#endif
+ return nr;
+}
+
+/*
+ * Refill the input buffer and return the next input character:
+ *
+ * 1) If a string was pushed back on the input, pop it;
+ * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
+ * from a string so we can't refill the buffer, return EOF.
+ * 3) If the is more stuff in this buffer, use it else call read to fill it.
+ * 4) Process input up to the next newline, deleting nul characters.
+ */
+
+int
+preadbuffer(shinstance *psh)
+{
+ char *p, *q;
+ int more;
+#ifndef SMALL
+ int something;
+#endif
+ char savec;
+
+ if (psh->parsefile->strpush) {
+ popstring(psh);
+ if (--psh->parsenleft >= 0)
+ return (*psh->parsenextc++);
+ }
+ if (psh->parsenleft == EOF_NLEFT || psh->parsefile->buf == NULL)
+ return PEOF;
+ flushout(&psh->output);
+ flushout(&psh->errout);
+
+again:
+ if (psh->parselleft <= 0) {
+ if ((psh->parselleft = preadfd(psh)) == -1) {
+ psh->parselleft = psh->parsenleft = EOF_NLEFT;
+ return PEOF;
+ }
+ }
+
+ q = p = psh->parsenextc;
+
+ /* delete nul characters */
+#ifndef SMALL
+ something = 0;
+#endif
+ for (more = 1; more;) {
+ switch (*p) {
+ case '\0':
+ p++; /* Skip nul */
+ goto check;
+
+ case '\t':
+ case ' ':
+ break;
+
+ case '\n':
+ psh->parsenleft = (int)(q - psh->parsenextc);
+ more = 0; /* Stop processing here */
+ break;
+
+ default:
+#ifndef SMALL
+ something = 1;
+#endif
+ break;
+ }
+
+ *q++ = *p++;
+check:
+ if (--psh->parselleft <= 0) {
+ psh->parsenleft = (int)(q - psh->parsenextc - 1);
+ if (psh->parsenleft < 0)
+ goto again;
+ *q = '\0';
+ more = 0;
+ }
+ }
+
+ savec = *q;
+ *q = '\0';
+
+#ifndef SMALL
+ if (psh->parsefile->fd == 0 && hist && something) {
+ HistEvent he;
+ INTOFF;
+ history(hist, &he, psh->whichprompt == 1? H_ENTER : H_APPEND,
+ psh->parsenextc);
+ INTON;
+ }
+#endif
+
+ if (vflag(psh)) {
+ out2str(psh, psh->parsenextc);
+ flushout(psh->out2);
+ }
+
+ *q = savec;
+
+ return *psh->parsenextc++;
+}
+
+/*
+ * Undo the last call to pgetc. Only one character may be pushed back.
+ * PEOF may be pushed back.
+ */
+
+void
+pungetc(shinstance *psh)
+{
+ psh->parsenleft++;
+ psh->parsenextc--;
+}
+
+/*
+ * Push a string back onto the input at this current parsefile level.
+ * We handle aliases this way.
+ */
+void
+pushstring(shinstance *psh, char *s, size_t len, void *ap)
+{
+ struct strpush *sp;
+
+ INTOFF;
+/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
+ if (psh->parsefile->strpush) {
+ sp = ckmalloc(psh, sizeof (struct strpush));
+ sp->prev = psh->parsefile->strpush;
+ psh->parsefile->strpush = sp;
+ } else
+ sp = psh->parsefile->strpush = &(psh->parsefile->basestrpush);
+ sp->prevstring = psh->parsenextc;
+ sp->prevnleft = psh->parsenleft;
+ sp->prevlleft = psh->parselleft;
+ sp->ap = (struct alias *)ap;
+ if (ap)
+ ((struct alias *)ap)->flag |= ALIASINUSE;
+ psh->parsenextc = s;
+ psh->parsenleft = (int)len;
+ INTON;
+}
+
+void
+popstring(shinstance *psh)
+{
+ struct strpush *sp = psh->parsefile->strpush;
+
+ INTOFF;
+ psh->parsenextc = sp->prevstring;
+ psh->parsenleft = sp->prevnleft;
+ psh->parselleft = sp->prevlleft;
+/*dprintf("*** calling popstring: restoring to '%s'\n", psh->parsenextc);*/
+ if (sp->ap)
+ sp->ap->flag &= ~ALIASINUSE;
+ psh->parsefile->strpush = sp->prev;
+ if (sp != &(psh->parsefile->basestrpush))
+ ckfree(psh, sp);
+ INTON;
+}
+
+/*
+ * Set the input to take input from a file. If push is set, push the
+ * old input onto the stack first.
+ */
+
+void
+setinputfile(shinstance *psh, const char *fname, int push)
+{
+ int fd;
+ int fd2;
+
+ INTOFF;
+/** @todo shfile fixme */
+ if ((fd = shfile_open(&psh->fdtab, fname, O_RDONLY, 0)) < 0)
+ error(psh, "Can't open %s", fname);
+ if (fd < 10) {
+ fd2 = movefd_above(psh, fd, 10);
+ if (fd2 < 0)
+ error(psh, "Out of file descriptors");
+ fd = fd2;
+ }
+ setinputfd(psh, fd, push);
+ INTON;
+}
+
+
+/*
+ * Like setinputfile, but takes an open file descriptor. Call this with
+ * interrupts off.
+ */
+
+void
+setinputfd(shinstance *psh, int fd, int push)
+{
+ (void) shfile_cloexec(&psh->fdtab, fd, 1 /* close it */);
+ if (push) {
+ pushfile(psh);
+ psh->parsefile->buf = ckmalloc(psh, BUFSIZ);
+ }
+ if (psh->parsefile->fd > 0)
+ shfile_close(&psh->fdtab, psh->parsefile->fd);
+ psh->parsefile->fd = fd;
+ if (psh->parsefile->buf == NULL)
+ psh->parsefile->buf = ckmalloc(psh, BUFSIZ);
+ psh->parselleft = psh->parsenleft = 0;
+ psh->plinno = 1;
+}
+
+
+/*
+ * Like setinputfile, but takes input from a string.
+ */
+
+void
+setinputstring(shinstance *psh, char *string, int push)
+{
+ INTOFF;
+ if (push)
+ pushfile(psh);
+ psh->parsenextc = string;
+ psh->parselleft = psh->parsenleft = (int)strlen(string);
+ psh->parsefile->buf = NULL;
+ psh->plinno = 1;
+ INTON;
+}
+
+
+
+/*
+ * To handle the "." command, a stack of input files is used. Pushfile
+ * adds a new entry to the stack and popfile restores the previous level.
+ */
+
+STATIC void
+pushfile(shinstance *psh)
+{
+ struct parsefile *pf;
+
+ psh->parsefile->nleft = psh->parsenleft;
+ psh->parsefile->lleft = psh->parselleft;
+ psh->parsefile->nextc = psh->parsenextc;
+ psh->parsefile->linno = psh->plinno;
+ pf = (struct parsefile *)ckmalloc(psh, sizeof (struct parsefile));
+ pf->prev = psh->parsefile;
+ pf->fd = -1;
+ pf->strpush = NULL;
+ pf->basestrpush.prev = NULL;
+ psh->parsefile = pf;
+}
+
+
+void
+popfile(shinstance *psh)
+{
+ struct parsefile *pf = psh->parsefile;
+
+ INTOFF;
+ if (pf->fd >= 0)
+ shfile_close(&psh->fdtab, pf->fd);
+ if (pf->buf)
+ ckfree(psh, pf->buf);
+ while (pf->strpush)
+ popstring(psh);
+ psh->parsefile = pf->prev;
+ ckfree(psh, pf);
+ psh->parsenleft = psh->parsefile->nleft;
+ psh->parselleft = psh->parsefile->lleft;
+ psh->parsenextc = psh->parsefile->nextc;
+ psh->plinno = psh->parsefile->linno;
+ INTON;
+}
+
+
+/*
+ * Return to top level.
+ */
+
+void
+popallfiles(shinstance *psh)
+{
+ while (psh->parsefile != &psh->basepf)
+ popfile(psh);
+}
+
+
+
+/*
+ * Close the file(s) that the shell is reading commands from. Called
+ * after a fork is done.
+ *
+ * Takes one arg, vfork, which tells it to not modify its global vars
+ * as it is still running in the parent.
+ *
+ * This code is (probably) unnecessary as the 'close on exec' flag is
+ * set and should be enough. In the vfork case it is definitely wrong
+ * to close the fds as another fork() may be done later to feed data
+ * from a 'here' document into a pipe and we don't want to close the
+ * pipe!
+ */
+
+void
+closescript(shinstance *psh)
+{
+ popallfiles(psh);
+ if (psh->parsefile->fd > 0) {
+ shfile_close(&psh->fdtab, psh->parsefile->fd);
+ psh->parsefile->fd = 0;
+ }
+}
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