+++ /dev/null
-/* Return the canonical absolute name of a given file.
- Copyright (C) 1996-2003, 2005-2008 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- This program 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.
-
- 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 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/>. */
-
-#include <config.h>
-
-/* Avoid a clash of our rpl_realpath() function with the prototype in
- <stdlib.h> on Solaris 2.5.1. */
-#undef realpath
-
-#if !HAVE_CANONICALIZE_FILE_NAME || defined _LIBC
-
-#include <alloca.h>
-
-/* Specification. */
-#include "canonicalize.h"
-
-#include <stddef.h>
-#include <stdlib.h>
-#include <string.h>
-
-#if HAVE_UNISTD_H || defined _LIBC
-# include <unistd.h>
-#endif
-
-#include <limits.h>
-
-#if HAVE_SYS_PARAM_H || defined _LIBC
-# include <sys/param.h>
-#endif
-#ifndef MAXSYMLINKS
-# define MAXSYMLINKS 20
-#endif
-
-#include <sys/stat.h>
-
-#include <errno.h>
-#ifndef _LIBC
-# define __set_errno(e) errno = (e)
-# ifndef ENAMETOOLONG
-# define ENAMETOOLONG EINVAL
-# endif
-#endif
-
-#ifdef _LIBC
-# include <shlib-compat.h>
-#else
-# define SHLIB_COMPAT(lib, introduced, obsoleted) 0
-# define versioned_symbol(lib, local, symbol, version)
-# define compat_symbol(lib, local, symbol, version)
-# define weak_alias(local, symbol)
-# define __canonicalize_file_name canonicalize_file_name
-# define __realpath rpl_realpath
-# include "pathmax.h"
-# include "malloca.h"
-# if HAVE_GETCWD
-# ifdef VMS
- /* We want the directory in Unix syntax, not in VMS syntax. */
-# define __getcwd(buf, max) getcwd (buf, max, 0)
-# else
-# define __getcwd getcwd
-# endif
-# else
-# define __getcwd(buf, max) getwd (buf)
-# endif
-# define __readlink readlink
- /* On systems without symbolic links, call stat() instead of lstat(). */
-# if !defined S_ISLNK && !HAVE_READLINK
-# define lstat stat
-# endif
-#endif
-
-/* 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. */
-
-char *
-__realpath (const char *name, char *resolved)
-{
- char *rpath, *dest, *extra_buf = NULL;
- const char *start, *end, *rpath_limit;
- long int path_max;
-#if HAVE_READLINK
- int num_links = 0;
-#endif
-
- if (name == NULL)
- {
- /* As per Single Unix Specification V2 we must return an error if
- either parameter is a null pointer. We extend this to allow
- the RESOLVED parameter to be NULL in case the we are expected to
- allocate the room for the return value. */
- __set_errno (EINVAL);
- return NULL;
- }
-
- if (name[0] == '\0')
- {
- /* As per Single Unix Specification V2 we must return an error if
- the name argument points to an empty string. */
- __set_errno (ENOENT);
- return NULL;
- }
-
-#ifdef PATH_MAX
- path_max = PATH_MAX;
-#else
- path_max = pathconf (name, _PC_PATH_MAX);
- if (path_max <= 0)
- path_max = 1024;
-#endif
-
- if (resolved == NULL)
- {
- rpath = malloc (path_max);
- if (rpath == NULL)
- {
- /* It's easier to set errno to ENOMEM than to rely on the
- 'malloc-posix' gnulib module. */
- errno = ENOMEM;
- return NULL;
- }
- }
- else
- rpath = resolved;
- rpath_limit = rpath + path_max;
-
- if (name[0] != '/')
- {
- if (!__getcwd (rpath, path_max))
- {
- rpath[0] = '\0';
- goto error;
- }
- dest = strchr (rpath, '\0');
- }
- else
- {
- rpath[0] = '/';
- dest = rpath + 1;
- }
-
- for (start = end = name; *start; start = end)
- {
-#ifdef _LIBC
- struct stat64 st;
-#else
- struct stat st;
-#endif
-
- /* Skip sequence of multiple path-separators. */
- while (*start == '/')
- ++start;
-
- /* Find end of path component. */
- for (end = start; *end && *end != '/'; ++end)
- /* Nothing. */;
-
- if (end - start == 0)
- break;
- else if (end - start == 1 && start[0] == '.')
- /* nothing */;
- else if (end - start == 2 && start[0] == '.' && start[1] == '.')
- {
- /* 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)
- {
- ptrdiff_t dest_offset = dest - rpath;
- char *new_rpath;
-
- if (resolved)
- {
- __set_errno (ENAMETOOLONG);
- if (dest > rpath + 1)
- dest--;
- *dest = '\0';
- goto error;
- }
- new_size = rpath_limit - rpath;
- if (end - start + 1 > path_max)
- new_size += end - start + 1;
- else
- new_size += path_max;
- new_rpath = (char *) realloc (rpath, new_size);
- if (new_rpath == NULL)
- {
- /* It's easier to set errno to ENOMEM than to rely on the
- 'realloc-posix' gnulib module. */
- errno = ENOMEM;
- goto error;
- }
- rpath = new_rpath;
- rpath_limit = rpath + new_size;
-
- dest = rpath + dest_offset;
- }
-
-#ifdef _LIBC
- dest = __mempcpy (dest, start, end - start);
-#else
- memcpy (dest, start, end - start);
- dest += end - start;
-#endif
- *dest = '\0';
-
-#ifdef _LIBC
- if (__lxstat64 (_STAT_VER, rpath, &st) < 0)
-#else
- if (lstat (rpath, &st) < 0)
-#endif
- goto error;
-
-#if HAVE_READLINK
- if (S_ISLNK (st.st_mode))
- {
- char *buf;
- size_t len;
- int n;
-
- if (++num_links > MAXSYMLINKS)
- {
- __set_errno (ELOOP);
- goto error;
- }
-
- buf = malloca (path_max);
- if (!buf)
- {
- errno = ENOMEM;
- goto error;
- }
-
- n = __readlink (rpath, buf, path_max - 1);
- if (n < 0)
- {
- int saved_errno = errno;
- freea (buf);
- errno = saved_errno;
- goto error;
- }
- buf[n] = '\0';
-
- if (!extra_buf)
- {
- extra_buf = malloca (path_max);
- if (!extra_buf)
- {
- freea (buf);
- errno = ENOMEM;
- goto error;
- }
- }
-
- len = strlen (end);
- if ((long int) (n + len) >= path_max)
- {
- freea (buf);
- __set_errno (ENAMETOOLONG);
- goto error;
- }
-
- /* Careful here, end may be a pointer into extra_buf... */
- memmove (&extra_buf[n], end, len + 1);
- name = end = memcpy (extra_buf, buf, n);
-
- 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] != '/');
- }
-#endif
- }
- }
- if (dest > rpath + 1 && dest[-1] == '/')
- --dest;
- *dest = '\0';
-
- if (extra_buf)
- freea (extra_buf);
-
- return resolved ? memcpy (resolved, rpath, dest - rpath + 1) : rpath;
-
-error:
- {
- int saved_errno = errno;
- if (extra_buf)
- freea (extra_buf);
- if (resolved)
- strcpy (resolved, rpath);
- else
- free (rpath);
- errno = saved_errno;
- }
- return NULL;
-}
-#ifdef _LIBC
-versioned_symbol (libc, __realpath, realpath, GLIBC_2_3);
-#endif
-
-
-#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_3)
-char *
-__old_realpath (const char *name, char *resolved)
-{
- if (resolved == NULL)
- {
- __set_errno (EINVAL);
- return NULL;
- }
-
- return __realpath (name, resolved);
-}
-compat_symbol (libc, __old_realpath, realpath, GLIBC_2_0);
-#endif
-
-
-char *
-__canonicalize_file_name (const char *name)
-{
- return __realpath (name, NULL);
-}
-weak_alias (__canonicalize_file_name, canonicalize_file_name)
-
-#else
-
-/* This declaration is solely to ensure that after preprocessing
- this file is never empty. */
-typedef int dummy;
-
-#endif
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