diff options
Diffstat (limited to 'm4/path.c')
| -rw-r--r-- | m4/path.c | 414 |
1 files changed, 0 insertions, 414 deletions
diff --git a/m4/path.c b/m4/path.c deleted file mode 100644 index 0c6a962d..00000000 --- a/m4/path.c +++ /dev/null @@ -1,414 +0,0 @@ -/* GNU m4 -- A simple macro processor - Copyright (C) 1989-1993, 1998, 2004, 2006-2010, 2013-2014, 2017 Free - Software Foundation, Inc. - - This file is part of GNU M4. - - GNU M4 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 3 of the License, or - (at your option) any later version. - - GNU M4 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 this program. If not, see <http://www.gnu.org/licenses/>. -*/ - -/* Handling of path search of included files via the builtins "include" - and "sinclude". */ - -#include <config.h> - -#include <stdio.h> -#include <string.h> -#include <sys/stat.h> -#include <unistd.h> - -#include "m4private.h" - -#include "configmake.h" -#include "dirname.h" -#include "filenamecat.h" - -#if OS2 /* Any others? */ -# define TRUNCATE_FILENAME 1 -#endif - -/* Define this to see runtime debug info. Implied by DEBUG. */ -/*#define DEBUG_INCL */ - -static const char *FILE_SUFFIXES[] = { - "", - ".m4f", - ".m4", - LT_MODULE_EXT, - NULL -}; - -static const char *NO_SUFFIXES[] = { "", NULL }; - -static void search_path_add (m4__search_path_info *, const char *, bool); -static void search_path_env_init (m4__search_path_info *, char *, bool); -static void include_env_init (m4 *context); - -#ifdef DEBUG_INCL -static void include_dump (m4 *context); -#endif - - -/* - * General functions for search paths - */ - -static void -search_path_add (m4__search_path_info *info, const char *dir, bool prepend) -{ - m4__search_path *path = (m4__search_path *) xmalloc (sizeof *path); - - path->len = strlen (dir); - path->dir = xstrdup (dir); - - if (path->len > info->max_length) /* remember len of longest directory */ - info->max_length = path->len; - - if (prepend) - { - path->next = info->list; - info->list = path; - if (info->list_end == NULL) - info->list_end = path; - } - else - { - path->next = NULL; - - if (info->list_end == NULL) - info->list = path; - else - info->list_end->next = path; - info->list_end = path; - } -} - -static void -search_path_env_init (m4__search_path_info *info, char *path, bool isabs) -{ - char *path_end; - - if (info == NULL || path == NULL) - return; - - do - { - path_end = strchr (path, PATH_SEPARATOR); - if (path_end) - *path_end = '\0'; - if (!isabs || *path == '/') - search_path_add (info, path, false); - path = path_end + 1; - } - while (path_end); -} - -static void -include_env_init (m4 *context) -{ - char *m4path; - - if (m4_get_posixly_correct_opt (context)) - return; - - m4path = getenv ("M4PATH"); - if (m4path) - m4path = xstrdup (m4path); - search_path_env_init (m4__get_search_path (context), m4path, false); - free (m4path); -} - - -#if TRUNCATE_FILENAME -/* Destructively modify PATH to contain no more than 8 non-`.' - characters, optionally followed by a `.' and a filenname extension - of 3 characters or fewer. */ -static char * -path_truncate (char *path) -{ - char *p, *beg = path; /* following final '/' */ - for (p = path; *p != '\0'; ++p) - { - if (ISSLASH (*p)) - beg = 1+ p; - } - - char *end = strchr (beg, '.'); /* first period */ - char *ext = strrchr (beg, '.'); /* last period */ - - size_t len = (size_t) (end - beg); /* length of filename element */ - if (len > 8) - end = beg + 8; - - if (ext == NULL) - { - *end = '\0'; - } - else if (ext != end) - { - stpncpy (end, ext, 4); - } - - return path; -} -#endif - - - -/* Functions for normal input path search */ - -void -m4_add_include_directory (m4 *context, const char *dir, bool prepend) -{ - if (m4_get_posixly_correct_opt (context)) - return; - - search_path_add (m4__get_search_path (context), dir, prepend); - -#ifdef DEBUG_INCL - xfprintf (stderr, "add_include_directory (%s) %s;\n", dir, - prepend ? "prepend" : "append"); -#endif -} - - -/* Search for FILENAME according to -B options, `.', -I options, then - M4PATH environment. If successful, return the open file, and if - RESULT is not NULL, set *RESULT to a malloc'd string that - represents the file found with respect to the current working - directory. Otherwise, return NULL, and errno reflects the failure - from searching `.' (regardless of what else was searched). */ -char * -m4_path_search (m4 *context, const char *filename, const char **suffixes) -{ - m4__search_path *incl; - char *filepath; /* buffer for constructed name */ - size_t max_suffix_len = 0; - int i, e = 0; - - /* Reject empty file. */ - if (*filename == '\0') - { - errno = ENOENT; - return NULL; - } - - /* Use no suffixes by default. */ - if (suffixes == NULL) - suffixes = NO_SUFFIXES; - - /* Find the longest suffix, so that we will always allocate enough - memory for a filename with suffix. */ - for (i = 0; suffixes && suffixes[i]; ++i) - { - size_t len = strlen (suffixes[i]); - if (len > max_suffix_len) - max_suffix_len = len; - } - - /* If file is absolute, or if we are not searching a path, a single - lookup will do the trick. */ - if (IS_ABSOLUTE_FILE_NAME (filename)) - { - size_t mem = strlen (filename); - - /* Try appending each of the suffixes we were given. */ - filepath = strncpy (xmalloc (mem + max_suffix_len +1), filename, mem +1); -#if TRUNCATE_FILENAME - filepath = path_truncate (filepath); - mem = strlen (filepath); /* recalculate length after truncation */ -#endif - for (i = 0; suffixes && suffixes[i]; ++i) - { - strcpy (filepath + mem, suffixes[i]); - if (access (filepath, R_OK) == 0) - return filepath; - - /* If search fails, we'll use the error we got from the first - access (usually with no suffix). */ - if (i == 0) - e = errno; - } - free (filepath); - - /* No such file. */ - errno = e; - return NULL; - } - - for (incl = m4__get_search_path (context)->list; - incl != NULL; incl = incl->next) - { - char *pathname = file_name_concat (incl->dir, filename, NULL); - size_t mem = strlen (pathname); - -#ifdef DEBUG_INCL - xfprintf (stderr, "path_search (%s) -- trying %s\n", filename, pathname); -#endif - - if (access (pathname, R_OK) == 0) - { - m4_debug_message (context, M4_DEBUG_TRACE_PATH, - _("path search for %s found %s"), - quotearg_style (locale_quoting_style, filename), - quotearg_n_style (1, locale_quoting_style, pathname)); - return pathname; - } - else if (!incl->len) - /* Capture errno only when searching `.'. */ - e = errno; - - filepath = strncpy (xmalloc (mem + max_suffix_len +1), pathname, mem +1); - free (pathname); -#if TRUNCATE_FILENAME - filepath = path_truncate (filepath); - mem = strlen (filepath); /* recalculate length after truncation */ -#endif - - for (i = 0; suffixes && suffixes[i]; ++i) - { - strcpy (filepath + mem, suffixes[i]); - if (access (filepath, R_OK) == 0) - return filepath; - } - free (filepath); - } - - errno = e; - return NULL; -} - - -/* Attempt to open FILE; if it opens, verify that it is not a - directory, and ensure it does not leak across execs. */ -FILE * -m4_fopen (m4 *context, const char *file, const char *mode) -{ - FILE *fp = NULL; - - if (file) - { - struct stat st; - int fd; - - fp = fopen (file, mode); - fd = fileno (fp); - - if (fstat (fd, &st) == 0 && S_ISDIR (st.st_mode)) - { - fclose (fp); - errno = EISDIR; - return NULL; - } - if (set_cloexec_flag (fileno (fp), true) != 0) - m4_error (context, 0, errno, NULL, - _("cannot protect input file across forks")); - } - return fp; -} - - -/* Generic load function. Push the input file or load the module named - FILENAME, if it can be found in the search path. Complain - about inaccesible files iff SILENT is false. */ -bool -m4_load_filename (m4 *context, const m4_call_info *caller, - const char *filename, m4_obstack *obs, bool silent) -{ - char *filepath = NULL; - char *suffix = NULL; - bool new_input = false; - - if (m4_get_posixly_correct_opt (context)) - { - if (access (filename, R_OK) == 0) - filepath = xstrdup (filename); - } - else - filepath = m4_path_search (context, filename, FILE_SUFFIXES); - - if (filepath) - suffix = strrchr (filepath, '.'); - - if (!m4_get_posixly_correct_opt (context) - && suffix - && STREQ (suffix, LT_MODULE_EXT)) - { - m4_module_load (context, filename, obs); - } - else - { - FILE *fp = NULL; - - if (filepath) - fp = m4_fopen (context, filepath, "r"); - - if (fp == NULL) - { - if (!silent) - m4_error (context, 0, errno, caller, _("cannot open file '%s'"), - filename); - free (filepath); - return false; - } - - m4_push_file (context, fp, filepath, true); - new_input = true; - } - free (filepath); - - return new_input; -} - - -void -m4__include_init (m4 *context) -{ - include_env_init (context); - - { - m4__search_path_info *info = m4__get_search_path (context); - - /* If M4PATH was not set, then search just the current directory by - default. */ - assert (info); - if (info->list_end == NULL) - search_path_add (info, "", false); - - /* Non-core modules installation directory. */ - search_path_add (info, PKGLIBDIR, false); - } - -#ifdef DEBUG_INCL - fputs ("initial include search path...\n", stderr); - include_dump (context); -#endif -} - - - -#ifdef DEBUG_INCL - -static void -include_dump (m4 *context) -{ - m4__search_path *incl; - - fputs ("include_dump:\n", stderr); - for (incl = m4__get_search_path (context)->list; - incl != NULL; incl = incl->next) - xfprintf (stderr, "\t'%s'\n", incl->dir); -} - -#endif /* DEBUG_INCL */ |