diff options
Diffstat (limited to 'lib/canonicalize-lgpl.c')
| -rw-r--r-- | lib/canonicalize-lgpl.c | 98 |
1 files changed, 65 insertions, 33 deletions
diff --git a/lib/canonicalize-lgpl.c b/lib/canonicalize-lgpl.c index 9bfb44f..6cbd2e0 100644 --- a/lib/canonicalize-lgpl.c +++ b/lib/canonicalize-lgpl.c @@ -1,5 +1,5 @@ /* Return the canonical absolute name of a given file. - Copyright (C) 1996-2011 Free Software Foundation, Inc. + Copyright (C) 1996-2013 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 @@ -16,15 +16,16 @@ along with this program. If not, see <http://www.gnu.org/licenses/>. */ #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) + +# define _GL_USE_STDLIB_ALLOC 1 # include <config.h> #endif #if !HAVE_CANONICALIZE_FILE_NAME || !FUNC_REALPATH_WORKS || 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) - /* Specification. */ #include <stdlib.h> @@ -50,6 +51,7 @@ # 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 @@ -68,8 +70,6 @@ # endif # define __readlink readlink # define __set_errno(e) errno = (e) -/* Use the system functions, not the gnulib overrides in this file. */ -# undef malloc # ifndef MAXSYMLINKS # ifdef SYMLOOP_MAX # define MAXSYMLINKS SYMLOOP_MAX @@ -85,10 +85,10 @@ #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 @@ -102,6 +102,7 @@ __realpath (const char *name, char *resolved) const char *start, *end, *rpath_limit; long int path_max; int num_links = 0; + size_t prefix_len; if (name == NULL) { @@ -126,7 +127,7 @@ __realpath (const char *name, char *resolved) #else path_max = pathconf (name, _PC_PATH_MAX); if (path_max <= 0) - path_max = 1024; + path_max = 8192; #endif if (resolved == NULL) @@ -144,7 +145,11 @@ __realpath (const char *name, char *resolved) 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)) { @@ -152,16 +157,28 @@ __realpath (const char *name, char *resolved) goto error; } dest = strchr (rpath, '\0'); + start = name; + prefix_len = FILE_SYSTEM_PREFIX_LEN (rpath); } else { - rpath[0] = '/'; - dest = rpath + 1; - if (DOUBLE_SLASH_IS_DISTINCT_ROOT && name[1] == '/') - *dest++ = '/'; + 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; @@ -171,11 +188,11 @@ __realpath (const char *name, char *resolved) int n; /* Skip sequence of multiple path-separators. */ - while (*start == '/') + while (ISSLASH (*start)) ++start; /* Find end of path component. */ - for (end = start; *end && *end != '/'; ++end) + for (end = start; *end && !ISSLASH (*end); ++end) /* Nothing. */; if (end - start == 0) @@ -185,17 +202,19 @@ __realpath (const char *name, char *resolved) 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] != '/'); - if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rpath + 1 - && *dest == '/') + 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] != '/') + if (!ISSLASH (dest[-1])) *dest++ = '/'; if (dest + (end - start) >= rpath_limit) @@ -206,7 +225,7 @@ __realpath (const char *name, char *resolved) if (resolved) { __set_errno (ENAMETOOLONG); - if (dest > rpath + 1) + if (dest > rpath + prefix_len + 1) dest--; *dest = '\0'; goto error; @@ -296,20 +315,32 @@ __realpath (const char *name, char *resolved) memmove (&extra_buf[n], end, len + 1); name = end = memcpy (extra_buf, buf, n); - if (buf[0] == '/') + if (IS_ABSOLUTE_FILE_NAME (buf)) { - dest = rpath + 1; /* It's an absolute symlink */ - if (DOUBLE_SLASH_IS_DISTINCT_ROOT && buf[1] == '/') - *dest++ = '/'; + 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 + 1) - while ((--dest)[-1] != '/'); + if (dest > rpath + prefix_len + 1) + for (--dest; dest > rpath && !ISSLASH (dest[-1]); --dest) + continue; if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rpath + 1 - && *dest == '/') + && ISSLASH (*dest) && !ISSLASH (dest[1]) && !prefix_len) dest++; } } @@ -320,9 +351,10 @@ __realpath (const char *name, char *resolved) } } } - 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 && *dest == '/') + if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rpath + 1 && !prefix_len + && ISSLASH (*dest) && !ISSLASH (dest[1])) dest++; *dest = '\0'; |