diff options
Diffstat (limited to 'support/canonicalize.c')
| -rw-r--r-- | support/canonicalize.c | 202 |
1 files changed, 0 insertions, 202 deletions
diff --git a/support/canonicalize.c b/support/canonicalize.c deleted file mode 100644 index a04a0ec..0000000 --- a/support/canonicalize.c +++ /dev/null @@ -1,202 +0,0 @@ -/* Return the canonical absolute name of a given file. - Copyright (C) 1996 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library 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 - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include <assert.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <limits.h> -#include <sys/param.h> -#include <sys/stat.h> -#include <errno.h> - -#include <gnome-argp.h> - -/* Return the canonical absolute name of file NAME. A canonical name - does not contain any `.', `..' components nor any repeated path - separators ('/') or symlinks. All path components must exist. If - RESOLVED is null, the result is malloc'd; otherwise, if the - canonical name is PATH_MAX chars or more, returns null with `errno' - set to ENAMETOOLONG; if the name fits in fewer than PATH_MAX chars, - returns the name in RESOLVED. If the name cannot be resolved and - RESOLVED is non-NULL, it contains the path of the first component - that cannot be resolved. If the path can be resolved, RESOLVED - holds the same value as the value returned. */ - -#ifdef _LIBC -#define set_errno(e) __set_errno(e) -#else -#define set_errno(e) errno = (e) -#endif - -static char * -canonicalize (const char *name, char *resolved) -{ - char *rpath, *dest, *extra_buf = NULL; - const char *start, *end, *rpath_limit; - long int path_max; - int num_links = 0; - -#ifdef PATH_MAX - path_max = PATH_MAX; -#else - path_max = pathconf (name, _PC_PATH_MAX); - if (path_max <= 0) - path_max = 1024; -#endif - - rpath = resolved ? __alloca (path_max) : malloc (path_max); - rpath_limit = rpath + path_max; - - if (name[0] != '/') - { - if (!getcwd (rpath, path_max)) - goto error; - dest = strchr (rpath, '\0'); - } - else - { - rpath[0] = '/'; - dest = rpath + 1; - } - - for (start = end = name; *start; start = end) - { - struct stat st; - int n; - - /* skip sequence of multiple path-separators: */ - while (*start == '/') ++start; - - /* find end of path component: */ - for (end = start; *end && *end != '/'; ++end); - - if (end - start == 0) - break; - else if (strncmp (start, ".", end - start) == 0) - /* nothing */; - else if (strncmp (start, "..", end - start) == 0) { - /* back up to previous component, ignore if at root already: */ - if (dest > rpath + 1) - while ((--dest)[-1] != '/'); - } else - { - size_t new_size; - - if (dest[-1] != '/') - *dest++ = '/'; - - if (dest + (end - start) >= rpath_limit) - { - if (resolved) - { - set_errno (ENAMETOOLONG); - goto error; - } - new_size = rpath_limit - rpath; - if (end - start + 1 > path_max) - new_size += end - start + 1; - else - new_size += path_max; - rpath = realloc (rpath, new_size); - rpath_limit = rpath + new_size; - if (!rpath) - return NULL; - } - - memcpy (dest, start, end - start); - dest += end - start; - *dest = '\0'; - - if (__lstat (rpath, &st) < 0) - goto error; - - if (S_ISLNK (st.st_mode)) - { - char *buf = __alloca (path_max); - - if (++num_links > MAXSYMLINKS) - { - set_errno (ELOOP); - goto error; - } - - n = readlink (rpath, buf, path_max); - if (n < 0) - goto error; - buf[n] = '\0'; - - if (!extra_buf) - extra_buf = __alloca (path_max); - - if ((long int) (n + strlen (end)) >= path_max) - { - set_errno (ENAMETOOLONG); - goto error; - } - - /* careful here, end may be a pointer into extra_buf... */ - strcat (buf, end); - strcpy (extra_buf, buf); - name = end = extra_buf; - - if (buf[0] == '/') - dest = rpath + 1; /* it's an absolute symlink */ - else - /* back up to previous component, ignore if at root already: */ - if (dest > rpath + 1) - while ((--dest)[-1] != '/'); - } - else - num_links = 0; - } - } - if (dest > rpath + 1 && dest[-1] == '/') - --dest; - *dest = '\0'; - - return resolved ? strcpy (resolved, rpath) : rpath; - -error: - if (resolved) - strcpy (resolved, rpath); - else - free (rpath); - return NULL; -} - -char * -realpath (const char *name, char *resolved) -{ - if (resolved == NULL) - { - set_errno (EINVAL); - return NULL; - } - - return canonicalize (name, resolved); -} - -#if 0 -char * -canonicalize_file_name (const char *name) -{ - return canonicalize (name, NULL); -} -#endif |