summaryrefslogtreecommitdiffstats
path: root/mount/realpath.c
diff options
context:
space:
mode:
Diffstat (limited to 'mount/realpath.c')
-rw-r--r--mount/realpath.c177
1 files changed, 0 insertions, 177 deletions
diff --git a/mount/realpath.c b/mount/realpath.c
deleted file mode 100644
index 9b46951b5..000000000
--- a/mount/realpath.c
+++ /dev/null
@@ -1,177 +0,0 @@
-/*
- * realpath.c -- canonicalize pathname by removing symlinks
- * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program 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 Public License for more details.
- */
-
-#define resolve_symlinks
-
-/*
- * This routine is part of libc. We include it nevertheless,
- * since the libc version has some security flaws.
- */
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
-#include "realpath.h"
-#include "sundries.h" /* for xstrdup */
-
-#ifndef MAXSYMLINKS
-# define MAXSYMLINKS 256
-#endif
-
-int
-is_pseudo_fs(const char *type)
-{
- if (type == NULL || *type == '/')
- return 0;
- if (streq(type, "none") ||
- streq(type, "proc") ||
- streq(type, "tmpfs") ||
- streq(type, "sysfs") ||
- streq(type, "devpts"))
- return 1;
- return 0;
-}
-
-/* Make a canonical pathname from PATH. Returns a freshly malloced string.
- It is up the *caller* to ensure that the PATH is sensible. i.e.
- canonicalize ("/dev/fd0/.") returns "/dev/fd0" even though ``/dev/fd0/.''
- is not a legal pathname for ``/dev/fd0''. Anything we cannot parse
- we return unmodified. */
-char *
-canonicalize_spec (const char *path)
-{
- if (path == NULL)
- return NULL;
- if (is_pseudo_fs(path))
- return xstrdup(path);
- return canonicalize(path);
-}
-
-char *
-canonicalize (const char *path) {
- char canonical[PATH_MAX+2];
-
- if (path == NULL)
- return NULL;
-
- if (myrealpath (path, canonical, PATH_MAX+1))
- return xstrdup(canonical);
-
- return xstrdup(path);
-}
-
-char *
-myrealpath(const char *path, char *resolved_path, int maxreslth) {
- int readlinks = 0;
- char *npath;
- char link_path[PATH_MAX+1];
- int n;
- char *buf = NULL;
-
- npath = resolved_path;
-
- /* If it's a relative pathname use getcwd for starters. */
- if (*path != '/') {
- if (!getcwd(npath, maxreslth-2))
- return NULL;
- npath += strlen(npath);
- if (npath[-1] != '/')
- *npath++ = '/';
- } else {
- *npath++ = '/';
- path++;
- }
-
- /* Expand each slash-separated pathname component. */
- while (*path != '\0') {
- /* Ignore stray "/" */
- if (*path == '/') {
- path++;
- continue;
- }
- if (*path == '.' && (path[1] == '\0' || path[1] == '/')) {
- /* Ignore "." */
- path++;
- continue;
- }
- if (*path == '.' && path[1] == '.' &&
- (path[2] == '\0' || path[2] == '/')) {
- /* Backup for ".." */
- path += 2;
- while (npath > resolved_path+1 &&
- (--npath)[-1] != '/')
- ;
- continue;
- }
- /* Safely copy the next pathname component. */
- while (*path != '\0' && *path != '/') {
- if (npath-resolved_path > maxreslth-2) {
- errno = ENAMETOOLONG;
- goto err;
- }
- *npath++ = *path++;
- }
-
- /* Protect against infinite loops. */
- if (readlinks++ > MAXSYMLINKS) {
- errno = ELOOP;
- goto err;
- }
-
- /* See if last pathname component is a symlink. */
- *npath = '\0';
- n = readlink(resolved_path, link_path, PATH_MAX);
- if (n < 0) {
- /* EINVAL means the file exists but isn't a symlink. */
- if (errno != EINVAL)
- goto err;
- } else {
-#ifdef resolve_symlinks /* Richard Gooch dislikes sl resolution */
- int m;
- char *newbuf;
-
- /* Note: readlink doesn't add the null byte. */
- link_path[n] = '\0';
- if (*link_path == '/')
- /* Start over for an absolute symlink. */
- npath = resolved_path;
- else
- /* Otherwise back up over this component. */
- while (*(--npath) != '/')
- ;
-
- /* Insert symlink contents into path. */
- m = strlen(path);
- newbuf = xmalloc(m + n + 1);
- memcpy(newbuf, link_path, n);
- memcpy(newbuf + n, path, m + 1);
- free(buf);
- path = buf = newbuf;
-#endif
- }
- *npath++ = '/';
- }
- /* Delete trailing slash but don't whomp a lone slash. */
- if (npath != resolved_path+1 && npath[-1] == '/')
- npath--;
- /* Make sure it's null terminated. */
- *npath = '\0';
-
- free(buf);
- return resolved_path;
-
- err:
- free(buf);
- return NULL;
-}