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/* Return the canonical absolute name of a given file.
Copyright (C) 1996-2001, 2002 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/*
* $Header: /var/cvsroot/gentoo-src/portage/src/sandbox-1.1/Attic/canonicalize.c,v 1.5.2.1 2004/10/22 16:53:30 carpaski Exp $
*/
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <errno.h>
#include <stddef.h>
#ifndef __set_errno
# define __set_errno(val) errno = (val)
#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 SB_PATH_MAX chars or more, returns null with `errno'
set to ENAMETOOLONG; if the name fits in fewer than SB_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. */
/* Modified: 19 Aug 2002; Martin Schlemmer <azarah@gentoo.org>
*
* Cleaned up unneeded stuff, and change so that it will not
* resolve symlinks. Also prepended a 'e' to functions that
* I did not rip out.
*
*/
char *
erealpath(const char *name, char *resolved)
{
char *rpath, *dest;
const char *start, *end, *rpath_limit;
long int path_max;
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 SB_PATH_MAX
path_max = SB_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)
return NULL;
} else
rpath = resolved;
rpath_limit = rpath + path_max;
if (name[0] != '/') {
if (!egetcwd(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) {
/* 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)
goto error;
rpath = new_rpath;
rpath_limit = rpath + new_size;
dest = rpath + dest_offset;
}
dest = __mempcpy(dest, start, end - start);
*dest = '\0';
}
}
#if 1
if (dest > rpath + 1 && dest[-1] == '/')
--dest;
#endif
*dest = '\0';
return resolved ? memcpy(resolved, rpath, dest - rpath + 1) : rpath;
error:
if (resolved)
strcpy(resolved, rpath);
else
free(rpath);
return NULL;
}
// vim:expandtab noai:cindent ai
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