/* Return the canonical absolute name of a given file.
- Copyright (C) 1996-2003, 2005-2009 Free Software Foundation, Inc.
+ Copyright (C) 1996-2014 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
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>
+#ifndef _LIBC
+/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
+ optimizes away the name == NULL test below. */
+# define _GL_ARG_NONNULL(params)
-#if !HAVE_CANONICALIZE_FILE_NAME || defined _LIBC
+# define _GL_USE_STDLIB_ALLOC 1
+# include <config.h>
+#endif
-#include <alloca.h>
+#if !HAVE_CANONICALIZE_FILE_NAME || !FUNC_REALPATH_WORKS || defined _LIBC
/* Specification. */
#include <stdlib.h>
-#include <stddef.h>
+#include <alloca.h>
#include <string.h>
#include <unistd.h>
-
#include <limits.h>
-
#if HAVE_SYS_PARAM_H || defined _LIBC
# include <sys/param.h>
#endif
-#ifndef MAXSYMLINKS
-# ifdef SYMLOOP_MAX
-# define MAXSYMLINKS SYMLOOP_MAX
-# else
-# define MAXSYMLINKS 20
-# endif
-#endif
-
#include <sys/stat.h>
-
#include <errno.h>
-#ifndef _LIBC
-# define __set_errno(e) errno = (e)
-#endif
+#include <stddef.h>
#ifdef _LIBC
# include <shlib-compat.h>
#else
# define SHLIB_COMPAT(lib, introduced, obsoleted) 0
-# define versioned_symbol(lib, local, symbol, version)
+# define versioned_symbol(lib, local, symbol, version) extern int dummy
# define compat_symbol(lib, local, symbol, version)
# define weak_alias(local, symbol)
# define __canonicalize_file_name canonicalize_file_name
# define __realpath realpath
# include "pathmax.h"
# include "malloca.h"
+# include "dosname.h"
# if HAVE_GETCWD
+# if IN_RELOCWRAPPER
+ /* When building the relocatable program wrapper, use the system's getcwd
+ function, not the gnulib override, otherwise we would get a link error.
+ */
+# undef getcwd
+# endif
# ifdef VMS
/* We want the directory in Unix syntax, not in VMS syntax. */
# define __getcwd(buf, max) getcwd (buf, max, 0)
# define __getcwd(buf, max) getwd (buf)
# endif
# define __readlink readlink
+# define __set_errno(e) errno = (e)
+# ifndef MAXSYMLINKS
+# ifdef SYMLOOP_MAX
+# define MAXSYMLINKS SYMLOOP_MAX
+# else
+# define MAXSYMLINKS 20
+# endif
+# endif
+#endif
+
+#ifndef DOUBLE_SLASH_IS_DISTINCT_ROOT
+# define DOUBLE_SLASH_IS_DISTINCT_ROOT 0
#endif
+#if !FUNC_REALPATH_WORKS || defined _LIBC
/* Return the canonical absolute name of file NAME. A canonical name
- does not contain any `.', `..' components nor any repeated path
+ 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'
+ 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
const char *start, *end, *rpath_limit;
long int path_max;
int num_links = 0;
+ size_t prefix_len;
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. */
+ 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. */
+ the name argument points to an empty string. */
__set_errno (ENOENT);
return NULL;
}
#else
path_max = pathconf (name, _PC_PATH_MAX);
if (path_max <= 0)
- path_max = 1024;
+ path_max = 8192;
#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;
- }
+ {
+ /* 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] != '/')
+ /* This is always zero for Posix hosts, but can be 2 for MS-Windows
+ and MS-DOS X:/foo/bar file names. */
+ prefix_len = FILE_SYSTEM_PREFIX_LEN (name);
+
+ if (!IS_ABSOLUTE_FILE_NAME (name))
{
if (!__getcwd (rpath, path_max))
- {
- rpath[0] = '\0';
- goto error;
- }
+ {
+ rpath[0] = '\0';
+ goto error;
+ }
dest = strchr (rpath, '\0');
+ start = name;
+ prefix_len = FILE_SYSTEM_PREFIX_LEN (rpath);
}
else
{
- rpath[0] = '/';
- dest = rpath + 1;
+ dest = rpath;
+ if (prefix_len)
+ {
+ memcpy (rpath, name, prefix_len);
+ dest += prefix_len;
+ }
+ *dest++ = '/';
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT)
+ {
+ if (ISSLASH (name[1]) && !ISSLASH (name[2]) && !prefix_len)
+ *dest++ = '/';
+ *dest = '\0';
+ }
+ start = name + prefix_len;
}
- for (start = end = name; *start; start = end)
+ for (end = start; *start; start = end)
{
#ifdef _LIBC
struct stat64 st;
#else
struct stat st;
#endif
+ int n;
/* Skip sequence of multiple path-separators. */
- while (*start == '/')
- ++start;
+ while (ISSLASH (*start))
+ ++start;
/* Find end of path component. */
- for (end = start; *end && *end != '/'; ++end)
- /* Nothing. */;
+ for (end = start; *end && !ISSLASH (*end); ++end)
+ /* Nothing. */;
if (end - start == 0)
- break;
+ break;
else if (end - start == 1 && start[0] == '.')
- /* nothing */;
+ /* 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] != '/');
- }
+ {
+ /* Back up to previous component, ignore if at root already. */
+ if (dest > rpath + prefix_len + 1)
+ for (--dest; dest > rpath && !ISSLASH (dest[-1]); --dest)
+ continue;
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT
+ && dest == rpath + 1 && !prefix_len
+ && ISSLASH (*dest) && !ISSLASH (dest[1]))
+ dest++;
+ }
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;
- }
+ {
+ size_t new_size;
+
+ if (!ISSLASH (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 + prefix_len + 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);
+ dest = __mempcpy (dest, start, end - start);
#else
- memcpy (dest, start, end - start);
- dest += end - start;
+ memcpy (dest, start, end - start);
+ dest += end - start;
#endif
- *dest = '\0';
+ *dest = '\0';
#ifdef _LIBC
- if (__lxstat64 (_STAT_VER, rpath, &st) < 0)
+ if (__lxstat64 (_STAT_VER, rpath, &st) < 0)
#else
- if (lstat (rpath, &st) < 0)
+ if (lstat (rpath, &st) < 0)
#endif
- goto error;
-
- 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] != '/');
- }
- }
+ goto error;
+
+ if (S_ISLNK (st.st_mode))
+ {
+ char *buf;
+ size_t len;
+
+ 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 (IS_ABSOLUTE_FILE_NAME (buf))
+ {
+ size_t pfxlen = FILE_SYSTEM_PREFIX_LEN (buf);
+
+ if (pfxlen)
+ memcpy (rpath, buf, pfxlen);
+ dest = rpath + pfxlen;
+ *dest++ = '/'; /* It's an absolute symlink */
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT)
+ {
+ if (ISSLASH (buf[1]) && !ISSLASH (buf[2]) && !pfxlen)
+ *dest++ = '/';
+ *dest = '\0';
+ }
+ /* Install the new prefix to be in effect hereafter. */
+ prefix_len = pfxlen;
+ }
+ else
+ {
+ /* Back up to previous component, ignore if at root
+ already: */
+ if (dest > rpath + prefix_len + 1)
+ for (--dest; dest > rpath && !ISSLASH (dest[-1]); --dest)
+ continue;
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rpath + 1
+ && ISSLASH (*dest) && !ISSLASH (dest[1]) && !prefix_len)
+ dest++;
+ }
+ }
+ else if (!S_ISDIR (st.st_mode) && *end != '\0')
+ {
+ __set_errno (ENOTDIR);
+ goto error;
+ }
+ }
}
- if (dest > rpath + 1 && dest[-1] == '/')
+ if (dest > rpath + prefix_len + 1 && ISSLASH (dest[-1]))
--dest;
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rpath + 1 && !prefix_len
+ && ISSLASH (*dest) && !ISSLASH (dest[1]))
+ dest++;
*dest = '\0';
if (extra_buf)
freea (extra_buf);
- return resolved ? memcpy (resolved, rpath, dest - rpath + 1) : rpath;
+ return rpath;
error:
{
int saved_errno = errno;
if (extra_buf)
freea (extra_buf);
- if (resolved)
- strcpy (resolved, rpath);
- else
+ if (resolved == NULL)
free (rpath);
errno = saved_errno;
}
return NULL;
}
-#ifdef _LIBC
versioned_symbol (libc, __realpath, realpath, GLIBC_2_3);
-#endif
+#endif /* !FUNC_REALPATH_WORKS || defined _LIBC */
#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_3)
char *
+attribute_compat_text_section
__old_realpath (const char *name, char *resolved)
{
if (resolved == NULL)
projects / gnulib.git / blobdiff