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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.20.1/] [libiberty/] [lrealpath.c] - Rev 233
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/* Libiberty realpath. Like realpath, but more consistent behavior. Based on gdb_realpath from GDB. Copyright 2003 Free Software Foundation, Inc. This file is part of the libiberty library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ /* @deftypefn Replacement {const char*} lrealpath (const char *@var{name}) Given a pointer to a string containing a pathname, returns a canonical version of the filename. Symlinks will be resolved, and ``.'' and ``..'' components will be simplified. The returned value will be allocated using @code{malloc}, or @code{NULL} will be returned on a memory allocation error. @end deftypefn */ #include "config.h" #include "ansidecl.h" #include "libiberty.h" #ifdef HAVE_LIMITS_H #include <limits.h> #endif #ifdef HAVE_STDLIB_H #include <stdlib.h> #endif #ifdef HAVE_UNISTD_H #include <unistd.h> #endif #ifdef HAVE_STRING_H #include <string.h> #endif /* On GNU libc systems the declaration is only visible with _GNU_SOURCE. */ #if defined(HAVE_CANONICALIZE_FILE_NAME) \ && defined(NEED_DECLARATION_CANONICALIZE_FILE_NAME) extern char *canonicalize_file_name (const char *); #endif #if defined(HAVE_REALPATH) # if defined (PATH_MAX) # define REALPATH_LIMIT PATH_MAX # else # if defined (MAXPATHLEN) # define REALPATH_LIMIT MAXPATHLEN # endif # endif #else /* cygwin has realpath, so it won't get here. */ # if defined (_WIN32) # define WIN32_LEAN_AND_MEAN # include <windows.h> /* for GetFullPathName */ # endif #endif char * lrealpath (const char *filename) { /* Method 1: The system has a compile time upper bound on a filename path. Use that and realpath() to canonicalize the name. This is the most common case. Note that, if there isn't a compile time upper bound, you want to avoid realpath() at all costs. */ #if defined(REALPATH_LIMIT) { char buf[REALPATH_LIMIT]; const char *rp = realpath (filename, buf); if (rp == NULL) rp = filename; return strdup (rp); } #endif /* REALPATH_LIMIT */ /* Method 2: The host system (i.e., GNU) has the function canonicalize_file_name() which malloc's a chunk of memory and returns that, use that. */ #if defined(HAVE_CANONICALIZE_FILE_NAME) { char *rp = canonicalize_file_name (filename); if (rp == NULL) return strdup (filename); else return rp; } #endif /* Method 3: Now we're getting desperate! The system doesn't have a compile time buffer size and no alternative function. Query the OS, using pathconf(), for the buffer limit. Care is needed though, some systems do not limit PATH_MAX (return -1 for pathconf()) making it impossible to pass a correctly sized buffer to realpath() (it could always overflow). On those systems, we skip this. */ #if defined (HAVE_REALPATH) && defined (HAVE_UNISTD_H) { /* Find out the max path size. */ long path_max = pathconf ("/", _PC_PATH_MAX); if (path_max > 0) { /* PATH_MAX is bounded. */ char *buf, *rp, *ret; buf = (char *) malloc (path_max); if (buf == NULL) return NULL; rp = realpath (filename, buf); ret = strdup (rp ? rp : filename); free (buf); return ret; } } #endif /* The MS Windows method. If we don't have realpath, we assume we don't have symlinks and just canonicalize to a Windows absolute path. GetFullPath converts ../ and ./ in relative paths to absolute paths, filling in current drive if one is not given or using the current directory of a specified drive (eg, "E:foo"). It also converts all forward slashes to back slashes. */ #if defined (_WIN32) { char buf[MAX_PATH]; char* basename; DWORD len = GetFullPathName (filename, MAX_PATH, buf, &basename); if (len == 0 || len > MAX_PATH - 1) return strdup (filename); else { /* The file system is case-preserving but case-insensitive, Canonicalize to lowercase, using the codepage associated with the process locale. */ CharLowerBuff (buf, len); return strdup (buf); } } #endif /* This system is a lost cause, just duplicate the filename. */ return strdup (filename); }
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