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version 1.1.1.1, 2012/02/21 22:57:48
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version 1.1.1.2, 2012/05/29 09:29:43
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| /* Return the canonical absolute name of a given file. |
/* Return the canonical absolute name of a given file. |
| Copyright (C) 1996-2003, 2005-2008 Free Software Foundation, Inc. | Copyright (C) 1996-2011 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
This file is part of the GNU C Library. |
| |
|
| This program is free software: you can redistribute it and/or modify |
This program is free software: you can redistribute it and/or modify |
|
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| You should have received a copy of the GNU General Public License |
You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
|
| #include <config.h> | #ifndef _LIBC |
| | # define _GL_USE_STDLIB_ALLOC 1 |
| | # include <config.h> |
| | #endif |
| |
|
| /* Avoid a clash of our rpl_realpath() function with the prototype in | #if !HAVE_CANONICALIZE_FILE_NAME || !FUNC_REALPATH_WORKS || defined _LIBC |
| <stdlib.h> on Solaris 2.5.1. */ | |
| #undef realpath | |
| |
|
| #if !HAVE_CANONICALIZE_FILE_NAME || defined _LIBC | /* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc |
| | optimizes away the name == NULL test below. */ |
| | #define _GL_ARG_NONNULL(params) |
| |
|
| #include <alloca.h> |
|
| |
|
| /* Specification. */ |
/* Specification. */ |
| #include "canonicalize.h" |
|
| |
|
| #include <stddef.h> |
|
| #include <stdlib.h> |
#include <stdlib.h> |
| #include <string.h> |
|
| |
|
| #if HAVE_UNISTD_H || defined _LIBC | #include <alloca.h> |
| # include <unistd.h> | #include <string.h> |
| #endif | #include <unistd.h> |
| |
| #include <limits.h> |
#include <limits.h> |
| |
|
| #if HAVE_SYS_PARAM_H || defined _LIBC |
#if HAVE_SYS_PARAM_H || defined _LIBC |
| # include <sys/param.h> |
# include <sys/param.h> |
| #endif |
#endif |
| #ifndef MAXSYMLINKS |
|
| # define MAXSYMLINKS 20 |
|
| #endif |
|
| |
|
| #include <sys/stat.h> |
#include <sys/stat.h> |
| |
|
| #include <errno.h> |
#include <errno.h> |
| #ifndef _LIBC | #include <stddef.h> |
| # define __set_errno(e) errno = (e) | |
| # ifndef ENAMETOOLONG | |
| # define ENAMETOOLONG EINVAL | |
| # endif | |
| #endif | |
| |
|
| #ifdef _LIBC |
#ifdef _LIBC |
| # include <shlib-compat.h> |
# include <shlib-compat.h> |
| #else |
#else |
| # define SHLIB_COMPAT(lib, introduced, obsoleted) 0 |
# 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 compat_symbol(lib, local, symbol, version) |
| # define weak_alias(local, symbol) |
# define weak_alias(local, symbol) |
| # define __canonicalize_file_name canonicalize_file_name |
# define __canonicalize_file_name canonicalize_file_name |
| # define __realpath rpl_realpath | # define __realpath realpath |
| # include "pathmax.h" |
# include "pathmax.h" |
| # include "malloca.h" |
# include "malloca.h" |
| # if HAVE_GETCWD |
# 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 |
# ifdef VMS |
| /* We want the directory in Unix syntax, not in VMS syntax. */ |
/* We want the directory in Unix syntax, not in VMS syntax. */ |
| # define __getcwd(buf, max) getcwd (buf, max, 0) |
# define __getcwd(buf, max) getcwd (buf, max, 0) |
|
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| # define __getcwd(buf, max) getwd (buf) |
# define __getcwd(buf, max) getwd (buf) |
| # endif |
# endif |
| # define __readlink readlink |
# define __readlink readlink |
| /* On systems without symbolic links, call stat() instead of lstat(). */ | # define __set_errno(e) errno = (e) |
| # if !defined S_ISLNK && !HAVE_READLINK | # ifndef MAXSYMLINKS |
| # define lstat stat | # ifdef SYMLOOP_MAX |
| | # define MAXSYMLINKS SYMLOOP_MAX |
| | # else |
| | # define MAXSYMLINKS 20 |
| | # endif |
| # endif |
# 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 |
/* 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 |
separators ('/') or symlinks. All path components must exist. If |
|
Line 100 __realpath (const char *name, char *resolved)
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Line 100 __realpath (const char *name, char *resolved)
|
| char *rpath, *dest, *extra_buf = NULL; |
char *rpath, *dest, *extra_buf = NULL; |
| const char *start, *end, *rpath_limit; |
const char *start, *end, *rpath_limit; |
| long int path_max; |
long int path_max; |
| #if HAVE_READLINK |
|
| int num_links = 0; |
int num_links = 0; |
| #endif |
|
| |
|
| if (name == NULL) |
if (name == NULL) |
| { |
{ |
| /* As per Single Unix Specification V2 we must return an error if |
/* As per Single Unix Specification V2 we must return an error if |
| either parameter is a null pointer. We extend this to allow | either parameter is a null pointer. We extend this to allow |
| the RESOLVED parameter to be NULL in case the we are expected to | the RESOLVED parameter to be NULL in case the we are expected to |
| allocate the room for the return value. */ | allocate the room for the return value. */ |
| __set_errno (EINVAL); |
__set_errno (EINVAL); |
| return NULL; |
return NULL; |
| } |
} |
|
Line 117 __realpath (const char *name, char *resolved)
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Line 115 __realpath (const char *name, char *resolved)
|
| if (name[0] == '\0') |
if (name[0] == '\0') |
| { |
{ |
| /* As per Single Unix Specification V2 we must return an error if |
/* 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); |
__set_errno (ENOENT); |
| return NULL; |
return NULL; |
| } |
} |
|
Line 127 __realpath (const char *name, char *resolved)
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Line 125 __realpath (const char *name, char *resolved)
|
| #else |
#else |
| path_max = pathconf (name, _PC_PATH_MAX); |
path_max = pathconf (name, _PC_PATH_MAX); |
| if (path_max <= 0) |
if (path_max <= 0) |
| path_max = 1024; | path_max = 8192; |
| #endif |
#endif |
| |
|
| if (resolved == NULL) |
if (resolved == NULL) |
| { |
{ |
| rpath = malloc (path_max); |
rpath = malloc (path_max); |
| if (rpath == NULL) |
if (rpath == NULL) |
| { | { |
| /* It's easier to set errno to ENOMEM than to rely on the | /* It's easier to set errno to ENOMEM than to rely on the |
| 'malloc-posix' gnulib module. */ | 'malloc-posix' gnulib module. */ |
| errno = ENOMEM; | errno = ENOMEM; |
| return NULL; | return NULL; |
| } | } |
| } |
} |
| else |
else |
| rpath = resolved; |
rpath = resolved; |
|
Line 148 __realpath (const char *name, char *resolved)
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Line 146 __realpath (const char *name, char *resolved)
|
| if (name[0] != '/') |
if (name[0] != '/') |
| { |
{ |
| if (!__getcwd (rpath, path_max)) |
if (!__getcwd (rpath, path_max)) |
| { | { |
| rpath[0] = '\0'; | rpath[0] = '\0'; |
| goto error; | goto error; |
| } | } |
| dest = strchr (rpath, '\0'); |
dest = strchr (rpath, '\0'); |
| } |
} |
| else |
else |
| { |
{ |
| rpath[0] = '/'; |
rpath[0] = '/'; |
| dest = rpath + 1; |
dest = rpath + 1; |
| |
if (DOUBLE_SLASH_IS_DISTINCT_ROOT && name[1] == '/') |
| |
*dest++ = '/'; |
| } |
} |
| |
|
| for (start = end = name; *start; start = end) |
for (start = end = name; *start; start = end) |
|
Line 167 __realpath (const char *name, char *resolved)
|
Line 167 __realpath (const char *name, char *resolved)
|
| #else |
#else |
| struct stat st; |
struct stat st; |
| #endif |
#endif |
| |
int n; |
| |
|
| /* Skip sequence of multiple path-separators. */ |
/* Skip sequence of multiple path-separators. */ |
| while (*start == '/') |
while (*start == '/') |
| ++start; | ++start; |
| |
|
| /* Find end of path component. */ |
/* Find end of path component. */ |
| for (end = start; *end && *end != '/'; ++end) |
for (end = start; *end && *end != '/'; ++end) |
| /* Nothing. */; | /* Nothing. */; |
| |
|
| if (end - start == 0) |
if (end - start == 0) |
| break; | break; |
| else if (end - start == 1 && start[0] == '.') |
else if (end - start == 1 && start[0] == '.') |
| /* nothing */; | /* nothing */; |
| else if (end - start == 2 && start[0] == '.' && start[1] == '.') |
else if (end - start == 2 && start[0] == '.' && start[1] == '.') |
| { | { |
| /* Back up to previous component, ignore if at root already. */ | /* Back up to previous component, ignore if at root already. */ |
| if (dest > rpath + 1) | if (dest > rpath + 1) |
| while ((--dest)[-1] != '/'); | while ((--dest)[-1] != '/'); |
| } | if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rpath + 1 |
| | && *dest == '/') |
| | dest++; |
| | } |
| else |
else |
| { | { |
| size_t new_size; | size_t new_size; |
| |
|
| if (dest[-1] != '/') | if (dest[-1] != '/') |
| *dest++ = '/'; | *dest++ = '/'; |
| |
|
| if (dest + (end - start) >= rpath_limit) | if (dest + (end - start) >= rpath_limit) |
| { | { |
| ptrdiff_t dest_offset = dest - rpath; | ptrdiff_t dest_offset = dest - rpath; |
| char *new_rpath; | char *new_rpath; |
| |
|
| if (resolved) | if (resolved) |
| { | { |
| __set_errno (ENAMETOOLONG); | __set_errno (ENAMETOOLONG); |
| if (dest > rpath + 1) | if (dest > rpath + 1) |
| dest--; | dest--; |
| *dest = '\0'; | *dest = '\0'; |
| goto error; | goto error; |
| } | } |
| new_size = rpath_limit - rpath; | new_size = rpath_limit - rpath; |
| if (end - start + 1 > path_max) | if (end - start + 1 > path_max) |
| new_size += end - start + 1; | new_size += end - start + 1; |
| else | else |
| new_size += path_max; | new_size += path_max; |
| new_rpath = (char *) realloc (rpath, new_size); | new_rpath = (char *) realloc (rpath, new_size); |
| if (new_rpath == NULL) | if (new_rpath == NULL) |
| { | { |
| /* It's easier to set errno to ENOMEM than to rely on the | /* It's easier to set errno to ENOMEM than to rely on the |
| 'realloc-posix' gnulib module. */ | 'realloc-posix' gnulib module. */ |
| errno = ENOMEM; | errno = ENOMEM; |
| goto error; | goto error; |
| } | } |
| rpath = new_rpath; | rpath = new_rpath; |
| rpath_limit = rpath + new_size; | rpath_limit = rpath + new_size; |
| |
|
| dest = rpath + dest_offset; | dest = rpath + dest_offset; |
| } | } |
| |
|
| #ifdef _LIBC |
#ifdef _LIBC |
| dest = __mempcpy (dest, start, end - start); | dest = __mempcpy (dest, start, end - start); |
| #else |
#else |
| memcpy (dest, start, end - start); | memcpy (dest, start, end - start); |
| dest += end - start; | dest += end - start; |
| #endif |
#endif |
| *dest = '\0'; | *dest = '\0'; |
| |
|
| #ifdef _LIBC |
#ifdef _LIBC |
| if (__lxstat64 (_STAT_VER, rpath, &st) < 0) | if (__lxstat64 (_STAT_VER, rpath, &st) < 0) |
| #else |
#else |
| if (lstat (rpath, &st) < 0) | if (lstat (rpath, &st) < 0) |
| #endif |
#endif |
| goto error; | goto error; |
| |
|
| #if HAVE_READLINK | if (S_ISLNK (st.st_mode)) |
| if (S_ISLNK (st.st_mode)) | { |
| { | char *buf; |
| char *buf; | size_t len; |
| size_t len; | |
| int n; | |
| |
|
| if (++num_links > MAXSYMLINKS) | if (++num_links > MAXSYMLINKS) |
| { | { |
| __set_errno (ELOOP); | __set_errno (ELOOP); |
| goto error; | goto error; |
| } | } |
| |
|
| buf = malloca (path_max); | buf = malloca (path_max); |
| if (!buf) | if (!buf) |
| { | { |
| errno = ENOMEM; | errno = ENOMEM; |
| goto error; | goto error; |
| } | } |
| |
|
| n = __readlink (rpath, buf, path_max - 1); | n = __readlink (rpath, buf, path_max - 1); |
| if (n < 0) | if (n < 0) |
| { | { |
| int saved_errno = errno; | int saved_errno = errno; |
| freea (buf); | freea (buf); |
| errno = saved_errno; | errno = saved_errno; |
| goto error; | goto error; |
| } | } |
| buf[n] = '\0'; | buf[n] = '\0'; |
| |
|
| if (!extra_buf) | if (!extra_buf) |
| { | { |
| extra_buf = malloca (path_max); | extra_buf = malloca (path_max); |
| if (!extra_buf) | if (!extra_buf) |
| { | { |
| freea (buf); | freea (buf); |
| errno = ENOMEM; | errno = ENOMEM; |
| goto error; | goto error; |
| } | } |
| } | } |
| |
|
| len = strlen (end); | len = strlen (end); |
| if ((long int) (n + len) >= path_max) | if ((long int) (n + len) >= path_max) |
| { | { |
| freea (buf); | freea (buf); |
| __set_errno (ENAMETOOLONG); | __set_errno (ENAMETOOLONG); |
| goto error; | goto error; |
| } | } |
| |
|
| /* Careful here, end may be a pointer into extra_buf... */ | /* Careful here, end may be a pointer into extra_buf... */ |
| memmove (&extra_buf[n], end, len + 1); | memmove (&extra_buf[n], end, len + 1); |
| name = end = memcpy (extra_buf, buf, n); | name = end = memcpy (extra_buf, buf, n); |
| |
|
| if (buf[0] == '/') | if (buf[0] == '/') |
| dest = rpath + 1; /* It's an absolute symlink */ | { |
| else | dest = rpath + 1; /* It's an absolute symlink */ |
| /* Back up to previous component, ignore if at root already: */ | if (DOUBLE_SLASH_IS_DISTINCT_ROOT && buf[1] == '/') |
| if (dest > rpath + 1) | *dest++ = '/'; |
| while ((--dest)[-1] != '/'); | } |
| } | else |
| #endif | { |
| } | /* Back up to previous component, ignore if at root |
| | already: */ |
| | if (dest > rpath + 1) |
| | while ((--dest)[-1] != '/'); |
| | if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rpath + 1 |
| | && *dest == '/') |
| | dest++; |
| | } |
| | } |
| | else if (!S_ISDIR (st.st_mode) && *end != '\0') |
| | { |
| | __set_errno (ENOTDIR); |
| | goto error; |
| | } |
| | } |
| } |
} |
| if (dest > rpath + 1 && dest[-1] == '/') |
if (dest > rpath + 1 && dest[-1] == '/') |
| --dest; |
--dest; |
| |
if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rpath + 1 && *dest == '/') |
| |
dest++; |
| *dest = '\0'; |
*dest = '\0'; |
| |
|
| if (extra_buf) |
if (extra_buf) |
| freea (extra_buf); |
freea (extra_buf); |
| |
|
| return resolved ? memcpy (resolved, rpath, dest - rpath + 1) : rpath; | return rpath; |
| |
|
| error: |
error: |
| { |
{ |
| int saved_errno = errno; |
int saved_errno = errno; |
| if (extra_buf) |
if (extra_buf) |
| freea (extra_buf); |
freea (extra_buf); |
| if (resolved) | if (resolved == NULL) |
| strcpy (resolved, rpath); | |
| else | |
| free (rpath); |
free (rpath); |
| errno = saved_errno; |
errno = saved_errno; |
| } |
} |
| return NULL; |
return NULL; |
| } |
} |
| #ifdef _LIBC |
|
| versioned_symbol (libc, __realpath, realpath, GLIBC_2_3); |
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) |
#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_3) |
| char * |
char * |
| |
attribute_compat_text_section |
| __old_realpath (const char *name, char *resolved) |
__old_realpath (const char *name, char *resolved) |
| { |
{ |
| if (resolved == NULL) |
if (resolved == NULL) |