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. |
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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/>. */ |
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#include <config.h> | #ifndef _LIBC |
| # define _GL_USE_STDLIB_ALLOC 1 |
| # include <config.h> |
| #endif |
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|
/* 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 | |
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#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) |
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#include <alloca.h> |
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/* Specification. */ |
/* Specification. */ |
#include "canonicalize.h" |
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#include <stddef.h> |
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#include <stdlib.h> |
#include <stdlib.h> |
#include <string.h> |
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#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> |
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#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 |
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# define MAXSYMLINKS 20 |
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#endif |
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#include <sys/stat.h> |
#include <sys/stat.h> |
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#include <errno.h> |
#include <errno.h> |
#ifndef _LIBC | #include <stddef.h> |
# define __set_errno(e) errno = (e) | |
# ifndef ENAMETOOLONG | |
# define ENAMETOOLONG EINVAL | |
# endif | |
#endif | |
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|
#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 |
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# if IN_RELOCWRAPPER |
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/* When building the relocatable program wrapper, use the system's getcwd |
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function, not the gnulib override, otherwise we would get a link error. |
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*/ |
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# undef getcwd |
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# 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 |
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#ifndef DOUBLE_SLASH_IS_DISTINCT_ROOT |
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# define DOUBLE_SLASH_IS_DISTINCT_ROOT 0 |
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#endif |
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#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)
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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 |
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int num_links = 0; |
int num_links = 0; |
#endif |
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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)
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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)
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#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 |
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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)
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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; |
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if (DOUBLE_SLASH_IS_DISTINCT_ROOT && name[1] == '/') |
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*dest++ = '/'; |
} |
} |
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for (start = end = name; *start; start = end) |
for (start = end = name; *start; start = end) |
Line 167 __realpath (const char *name, char *resolved)
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Line 167 __realpath (const char *name, char *resolved)
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#else |
#else |
struct stat st; |
struct stat st; |
#endif |
#endif |
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int n; |
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/* Skip sequence of multiple path-separators. */ |
/* Skip sequence of multiple path-separators. */ |
while (*start == '/') |
while (*start == '/') |
++start; | ++start; |
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/* Find end of path component. */ |
/* Find end of path component. */ |
for (end = start; *end && *end != '/'; ++end) |
for (end = start; *end && *end != '/'; ++end) |
/* Nothing. */; | /* Nothing. */; |
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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; |
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if (dest[-1] != '/') | if (dest[-1] != '/') |
*dest++ = '/'; | *dest++ = '/'; |
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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; |
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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; |
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dest = rpath + dest_offset; | dest = rpath + dest_offset; |
} | } |
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#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'; |
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#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; |
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#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; | |
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if (++num_links > MAXSYMLINKS) | if (++num_links > MAXSYMLINKS) |
{ | { |
__set_errno (ELOOP); | __set_errno (ELOOP); |
goto error; | goto error; |
} | } |
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buf = malloca (path_max); | buf = malloca (path_max); |
if (!buf) | if (!buf) |
{ | { |
errno = ENOMEM; | errno = ENOMEM; |
goto error; | goto error; |
} | } |
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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'; |
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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; |
} | } |
} | } |
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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; |
} | } |
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/* 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); |
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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; |
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if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rpath + 1 && *dest == '/') |
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dest++; |
*dest = '\0'; |
*dest = '\0'; |
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if (extra_buf) |
if (extra_buf) |
freea (extra_buf); |
freea (extra_buf); |
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return resolved ? memcpy (resolved, rpath, dest - rpath + 1) : rpath; | return rpath; |
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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 |
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versioned_symbol (libc, __realpath, realpath, GLIBC_2_3); |
versioned_symbol (libc, __realpath, realpath, GLIBC_2_3); |
#endif | #endif /* !FUNC_REALPATH_WORKS || defined _LIBC */ |
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#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_3) |
#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_3) |
char * |
char * |
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attribute_compat_text_section |
__old_realpath (const char *name, char *resolved) |
__old_realpath (const char *name, char *resolved) |
{ |
{ |
if (resolved == NULL) |
if (resolved == NULL) |