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-rw-r--r--src/zsoelim.l561
1 files changed, 561 insertions, 0 deletions
diff --git a/src/zsoelim.l b/src/zsoelim.l
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@@ -0,0 +1,561 @@
+%top{
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include "manconfig.h"
+
+/* Flex emits several functions which might reasonably have various
+ * attributes applied and many unused macros; none of these are our problem.
+ */
+#if GNUC_PREREQ(8,0)
+# pragma GCC diagnostic ignored "-Wsuggest-attribute=malloc"
+#endif
+#pragma GCC diagnostic ignored "-Wsuggest-attribute=pure"
+#pragma GCC diagnostic ignored "-Wunused-macros"
+}
+
+%{
+
+/*
+ * zsoelim.l: eliminate .so includes within *roff source
+ *
+ * Copyright (C) 1994, 1995 Graeme W. Wilford. (Wilf.)
+ * Copyright (C) 1997 Fabrizio Polacco.
+ * Copyright (C) 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011
+ * Colin Watson.
+ *
+ * This file is part of man-db.
+ *
+ * man-db is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * man-db is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with man-db; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Added functionality over gsoelim to allow for compressed .so includes.
+ * This is required as the first *roff preprocessor in order to deal with
+ * 100% of compressed source files correctly. A replacement tmac.andoc was
+ * considered, but would not have been portable to all systems.
+ *
+ * Wed Oct 12 18:46:11 BST 1994 Wilf. (G.Wilford@ee.surrey.ac.uk)
+ *
+ * Tue, 14 Oct 1997 Fabrizio Polacco <fpolacco@debian.org>
+ * - added changes that were done to .c instead of -l source
+ * - added new start condition to avoid execution of .so requests
+ * inside a macro definition.
+ */
+
+#define MAX_SO_DEPTH 10 /* max .so recursion depth */
+#undef ACCEPT_QUOTES /* accept quoted roff requests */
+
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#define NAME so_name[so_stack_ptr]
+#define LINE so_line[so_stack_ptr]
+#define PIPE so_pipe[so_stack_ptr]
+
+#include "dirname.h"
+#include "gl_linkedhash_list.h"
+#include "gl_xlist.h"
+#include "xgetcwd.h"
+#include "xvasprintf.h"
+
+#include "gettext.h"
+#include <locale.h>
+#define _(String) gettext (String)
+
+#include "error.h"
+#include "glcontainers.h"
+#include "pipeline.h"
+#include "decompress.h"
+
+#include "globbing.h"
+#include "zsoelim.h"
+
+#ifdef ACCEPT_QUOTES
+# define ZAP_QUOTES zap_quotes ()
+static void zap_quotes (void);
+#else
+# define ZAP_QUOTES
+#endif
+
+static YY_BUFFER_STATE so_stack[MAX_SO_DEPTH];
+static char *so_name[MAX_SO_DEPTH];
+static int so_line[MAX_SO_DEPTH];
+static pipeline *so_pipe[MAX_SO_DEPTH];
+static int so_stack_ptr;
+static int no_newline;
+static gl_list_t so_manpathlist;
+static const char *so_parent_path;
+
+struct zsoelim_stdin_data {
+ char *path;
+ gl_list_t manpathlist;
+};
+
+/* The flex documentation says that yyin is only used by YY_INPUT, so we
+ * should safely be able to abuse it as a handy way to keep track of the
+ * current 'pipeline *' rather than the usual 'FILE *'.
+ */
+#define YY_INPUT(buf,result,max_size) { \
+ size_t size = max_size; \
+ const char *block = pipeline_read ((pipeline *) yyin, &size); \
+ if (block && size != 0) { \
+ memcpy (buf, block, size); \
+ buf[size] = '\0'; \
+ result = size; \
+ } else \
+ result = YY_NULL; \
+}
+#define YY_NO_INPUT
+%}
+
+%x so
+%x de
+%x end_request
+%x lfnumber
+%x lfname
+
+W [ \t]
+
+%option full noread ecs
+%option 8bit batch never-interactive
+%option noyywrap nounput
+
+%%
+
+^\.de{W}*.+ {
+ no_newline = 1;
+ ECHO;
+ BEGIN (de); /* Now we're inside of a macro definition: ends with a comment */
+ }
+
+^\.so{W}* {
+ no_newline = 1;
+ BEGIN (so); /* Now we're in the .so environment */
+ }
+
+^\.lf{W}* {
+ no_newline = 1;
+ ECHO; /* Now we're in the .lf environment */
+ BEGIN (lfnumber);
+ }
+
+^[^\.\n].* | /* fallback */
+^\.[^sl].* |
+^\.l[^f].* |
+^\.s[^o].* |
+^\.s |
+^\.l |
+. {
+ no_newline = 1;
+ ECHO;
+ }
+
+\n {
+ no_newline = 0;
+ putchar ('\n');
+ LINE++;
+ }
+
+
+<so>\"?[^ \t\n\"]+\"? { /* file names including whitespace ? */
+ if (so_stack_ptr == MAX_SO_DEPTH - 1)
+ error (FATAL, 0,
+ _("%s:%d: .so requests nested too "
+ "deeply or are recursive"),
+ NAME, LINE);
+
+ ZAP_QUOTES;
+ so_stack[so_stack_ptr++] = YY_CURRENT_BUFFER;
+ LINE = 1;
+
+ no_newline = 0;
+
+ if (zsoelim_open_file (yytext, so_manpathlist,
+ so_parent_path)) {
+ --so_stack_ptr;
+#ifndef __alpha
+ error (OK, 0,
+ _("%s:%d: warning: failed .so request"),
+ NAME, LINE);
+ printf (".so %s\n", yytext);
+#endif
+ BEGIN (end_request);
+ } else {
+ printf (".lf 1 %s\n", yytext);
+ yy_switch_to_buffer
+ (yy_create_buffer (yyin, YY_BUF_SIZE));
+ BEGIN (INITIAL);
+ }
+
+ }
+
+<end_request>{W}*\n {
+ no_newline = 0;
+ BEGIN (INITIAL);
+ }
+
+<so>\n {
+ no_newline = 0;
+ error (OK, 0,
+ _("%s:%d: warning: newline in .so request, "
+ "ignoring"),
+ NAME, LINE);
+ putchar ('\n');
+ LINE++;
+ BEGIN (INITIAL);
+ }
+
+<de>^\.\..* {
+ no_newline = 1;
+ ECHO;
+ BEGIN (INITIAL);
+ }
+
+<de>.* {
+ no_newline = 1;
+ ECHO;
+ }
+
+<de>\n {
+ no_newline = 0;
+ putchar ('\n');
+ LINE++;
+ }
+
+
+<lfnumber>\"?[0-9]+\"? {
+ no_newline = 1;
+ ECHO;
+ ZAP_QUOTES;
+ LINE = atoi (yytext);
+ BEGIN (lfname);
+ }
+
+<lfname>\"?[^ \t\n\"]+\"? { /* file names including whitespace ?? */
+ no_newline = 1;
+ ECHO;
+ putchar ('\n');
+ ZAP_QUOTES;
+ if (NAME)
+ free (NAME);
+ NAME = xstrdup (yytext);
+ BEGIN (end_request);
+ }
+
+<lfname>{W}+ {
+ no_newline = 1;
+ ECHO;
+ }
+
+<lfname>\n {
+ no_newline = 0;
+ putchar ('\n');
+ LINE++;
+ BEGIN (INITIAL);
+ }
+
+<lfnumber,lfname>. {
+ no_newline = 1;
+ error (OK, 0,
+ _("%s:%d: warning: malformed .lf request, "
+ "ignoring"),
+ NAME, LINE);
+ putchar (*yytext);
+ BEGIN (INITIAL);
+ }
+
+<lfnumber>\n {
+ no_newline = 0;
+ error (OK, 0,
+ _("%s:%d: warning: newline in .lf request, "
+ "ignoring"),
+ NAME, LINE);
+ putchar ('\n');
+ LINE++;
+ BEGIN (INITIAL);
+ }
+
+<<EOF>> {
+ pipeline_wait (PIPE);
+ pipeline_free (PIPE);
+ PIPE = NULL;
+ free (NAME);
+ NAME = NULL;
+
+ if (no_newline)
+ putchar ('\n');
+
+ if (--so_stack_ptr < 0) {
+ yyterminate ();
+ } else {
+ yy_delete_buffer (YY_CURRENT_BUFFER);
+ yy_switch_to_buffer (so_stack[so_stack_ptr]);
+ printf (".lf %d %s\n", LINE += 1, NAME);
+ }
+ no_newline = 0;
+ BEGIN (end_request);
+ }
+%%
+
+#ifdef ACCEPT_QUOTES
+/* remove leading and trailing quotes in requests */
+static void zap_quotes (void)
+{
+ if (*yytext == '"') {
+ if (yytext[yyleng - 1] == '"') {
+ yytext[yyleng - 1] = '\0';
+ yytext++;
+ } else
+ error (OK, 0,
+ _("%s:%d: unterminated quote in roff request"),
+ NAME, LINE);
+ }
+}
+#endif
+
+/* initialise the stack and call the parser */
+void zsoelim_parse_file (gl_list_t manpathlist, const char *parent_path)
+{
+ const char *line;
+ int linenum = 1;
+
+ so_stack_ptr = 0;
+ so_manpathlist = manpathlist;
+ so_parent_path = parent_path;
+
+ /* Skip over the first line if it's something that manconv might
+ * need to know about.
+ */
+ line = pipeline_peekline ((pipeline *) yyin);
+ if (line &&
+ (STRNEQ (line, PP_COOKIE, 4) || STRNEQ (line, ".\\\" ", 4))) {
+ fputs (line, stdout);
+ pipeline_peek_skip ((pipeline *) yyin, strlen (line));
+ ++linenum;
+ }
+
+ printf (".lf %d %s\n", linenum, NAME);
+ LINE = 1;
+ yylex ();
+}
+
+static pipeline *try_compressed (char **filename)
+{
+ struct compression *comp;
+ size_t len = strlen (*filename);
+ pipeline *decomp;
+
+ /* Try the uncompressed name first. */
+ (*filename)[len - 1] = '\0';
+ debug ("trying %s\n", *filename);
+ decomp = decompress_open (*filename);
+ if (decomp)
+ return decomp;
+ (*filename)[len - 1] = '.';
+
+ for (comp = comp_list; comp->ext; ++comp) {
+ *filename = appendstr (*filename, comp->ext, NULL);
+ debug ("trying %s\n", *filename);
+ decomp = decompress_open (*filename);
+ if (decomp)
+ return decomp;
+ (*filename)[len] = '\0';
+ }
+
+ return NULL;
+}
+
+/* This routine is used to open the specified file or uncompress a compressed
+ version and open that instead */
+int zsoelim_open_file (const char *filename, gl_list_t manpathlist,
+ const char *parent_path)
+{
+ pipeline *decomp;
+
+ if (parent_path)
+ debug ("opening %s (parent path: %s)\n",
+ filename, parent_path);
+ else
+ debug ("opening %s\n", filename);
+
+ if (strcmp (filename, "-") == 0) {
+ decomp = decompress_fdopen (dup (STDIN_FILENO));
+ NAME = xstrdup (filename);
+ } else {
+ char *compfile;
+ const char *mp;
+
+ /* If there is no parent path, try opening directly first. */
+ if (!parent_path) {
+ compfile = xasprintf ("%s.", filename);
+
+ decomp = try_compressed (&compfile);
+ if (decomp) {
+ NAME = compfile;
+ goto out;
+ } else
+ free (compfile);
+ }
+
+ if (strchr (filename, '/')) {
+ /* File name with a directory part. Try looking it
+ * up within each manpath entry.
+ */
+ if (parent_path) {
+ compfile = xasprintf ("%s/%s.", parent_path,
+ filename);
+
+ decomp = try_compressed (&compfile);
+ if (decomp) {
+ NAME = compfile;
+ goto out;
+ }
+
+ free (compfile);
+ }
+
+ GL_LIST_FOREACH_START (manpathlist, mp) {
+ if (parent_path && STREQ (mp, parent_path))
+ continue;
+
+ compfile = xasprintf ("%s/%s.", mp, filename);
+
+ decomp = try_compressed (&compfile);
+ if (decomp) {
+ NAME = compfile;
+ goto out;
+ }
+
+ free (compfile);
+ } GL_LIST_FOREACH_END (manpathlist);
+ } else {
+ /* File name with no directory part. Try searching
+ * the manpath.
+ */
+ char *name, *sec, *dot;
+ gl_list_t names;
+ const char *found_name;
+
+ name = xstrdup (filename);
+ dot = strchr (name, '.');
+ if (!dot) {
+ free (name);
+ goto out;
+ }
+ *dot++ = '\0';
+ sec = dot;
+ dot = strchr (dot, '.');
+ if (dot)
+ *dot = '\0';
+
+ if (parent_path) {
+ names = look_for_file (parent_path, sec, name,
+ 0, LFF_MATCHCASE);
+ GL_LIST_FOREACH_START (names, found_name) {
+ decomp = decompress_open (found_name);
+ if (decomp) {
+ NAME = xstrdup (found_name);
+ gl_list_free (names);
+ goto out;
+ }
+ } GL_LIST_FOREACH_END (names);
+ gl_list_free (names);
+ }
+
+ GL_LIST_FOREACH_START (manpathlist, mp) {
+ if (parent_path && STREQ (mp, parent_path))
+ continue;
+
+ names = look_for_file (mp, sec, name,
+ 0, LFF_MATCHCASE);
+ GL_LIST_FOREACH_START (names, found_name) {
+ decomp = decompress_open (found_name);
+ if (decomp) {
+ NAME = xstrdup (found_name);
+ gl_list_free (names);
+ free (name);
+ goto out;
+ }
+ } GL_LIST_FOREACH_END (names);
+ gl_list_free (names);
+ } GL_LIST_FOREACH_END (manpathlist);
+
+ free (name);
+ }
+
+ /* If there is a parent path, try opening directly last. */
+ if (parent_path) {
+ compfile = xasprintf ("%s.", filename);
+
+ decomp = try_compressed (&compfile);
+ if (decomp) {
+ NAME = compfile;
+ goto out;
+ } else
+ free (compfile);
+ }
+
+out:
+ if (!decomp) {
+ error (0, errno, _("can't open %s"), filename);
+ return 1;
+ }
+ }
+
+ debug ("opened %s\n", NAME);
+
+ pipeline_start (decomp);
+ PIPE = decomp;
+ /* only used by YY_INPUT, which casts it back to 'pipeline *' */
+ yyin = (FILE *) decomp;
+
+ return 0;
+}
+
+void zsoelim_stdin (void *data)
+{
+ struct zsoelim_stdin_data *zsoelim_data = data;
+ gl_list_t empty;
+
+ empty = gl_list_create_empty (GL_LINKEDHASH_LIST, NULL, NULL, NULL,
+ true);
+ zsoelim_open_file ("-", empty, zsoelim_data->path);
+ gl_list_free (empty);
+ zsoelim_parse_file (zsoelim_data->manpathlist, zsoelim_data->path);
+}
+
+struct zsoelim_stdin_data *zsoelim_stdin_data_new (const char *path,
+ gl_list_t manpathlist)
+{
+ struct zsoelim_stdin_data *data = XMALLOC (struct zsoelim_stdin_data);
+
+ data->path = path ? xstrdup (path) : NULL;
+ data->manpathlist = manpathlist;
+
+ return data;
+}
+
+void zsoelim_stdin_data_free (void *data)
+{
+ struct zsoelim_stdin_data *zsoelim_data = data;
+
+ free (zsoelim_data->path);
+ free (zsoelim_data);
+}
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