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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libiberty/] [lrealpath.c] - Blame information for rev 736

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1 736 jeremybenn
/* Libiberty realpath.  Like realpath, but more consistent behavior.
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   Based on gdb_realpath from GDB.
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   Copyright 2003 Free Software Foundation, Inc.
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   This file is part of the libiberty library.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin Street - Fifth Floor,
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   Boston, MA 02110-1301, USA.  */
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/*
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@deftypefn Replacement {const char*} lrealpath (const char *@var{name})
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Given a pointer to a string containing a pathname, returns a canonical
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version of the filename.  Symlinks will be resolved, and ``.'' and ``..''
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components will be simplified.  The returned value will be allocated using
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@code{malloc}, or @code{NULL} will be returned on a memory allocation error.
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@end deftypefn
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*/
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#include "config.h"
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#include "ansidecl.h"
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#include "libiberty.h"
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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/* On GNU libc systems the declaration is only visible with _GNU_SOURCE.  */
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#if defined(HAVE_CANONICALIZE_FILE_NAME) \
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    && defined(NEED_DECLARATION_CANONICALIZE_FILE_NAME)
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extern char *canonicalize_file_name (const char *);
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#endif
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#if defined(HAVE_REALPATH)
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# if defined (PATH_MAX)
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#  define REALPATH_LIMIT PATH_MAX
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# else
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#  if defined (MAXPATHLEN)
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#   define REALPATH_LIMIT MAXPATHLEN
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#  endif
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# endif
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#else
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  /* cygwin has realpath, so it won't get here.  */
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# if defined (_WIN32)
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#  define WIN32_LEAN_AND_MEAN
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#  include <windows.h> /* for GetFullPathName */
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# endif
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#endif
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char *
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lrealpath (const char *filename)
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{
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  /* Method 1: The system has a compile time upper bound on a filename
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     path.  Use that and realpath() to canonicalize the name.  This is
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     the most common case.  Note that, if there isn't a compile time
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     upper bound, you want to avoid realpath() at all costs.  */
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#if defined(REALPATH_LIMIT)
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  {
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    char buf[REALPATH_LIMIT];
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    const char *rp = realpath (filename, buf);
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    if (rp == NULL)
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      rp = filename;
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    return strdup (rp);
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  }
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#endif /* REALPATH_LIMIT */
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  /* Method 2: The host system (i.e., GNU) has the function
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     canonicalize_file_name() which malloc's a chunk of memory and
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     returns that, use that.  */
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#if defined(HAVE_CANONICALIZE_FILE_NAME)
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  {
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    char *rp = canonicalize_file_name (filename);
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    if (rp == NULL)
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      return strdup (filename);
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    else
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      return rp;
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  }
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#endif
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  /* Method 3: Now we're getting desperate!  The system doesn't have a
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     compile time buffer size and no alternative function.  Query the
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     OS, using pathconf(), for the buffer limit.  Care is needed
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     though, some systems do not limit PATH_MAX (return -1 for
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     pathconf()) making it impossible to pass a correctly sized buffer
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     to realpath() (it could always overflow).  On those systems, we
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     skip this.  */
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#if defined (HAVE_REALPATH) && defined (HAVE_UNISTD_H)
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  {
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    /* Find out the max path size.  */
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    long path_max = pathconf ("/", _PC_PATH_MAX);
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    if (path_max > 0)
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      {
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        /* PATH_MAX is bounded.  */
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        char *buf, *rp, *ret;
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        buf = (char *) malloc (path_max);
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        if (buf == NULL)
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          return NULL;
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        rp = realpath (filename, buf);
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        ret = strdup (rp ? rp : filename);
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        free (buf);
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        return ret;
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      }
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  }
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#endif
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  /* The MS Windows method.  If we don't have realpath, we assume we
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     don't have symlinks and just canonicalize to a Windows absolute
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     path.  GetFullPath converts ../ and ./ in relative paths to
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     absolute paths, filling in current drive if one is not given
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     or using the current directory of a specified drive (eg, "E:foo").
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     It also converts all forward slashes to back slashes.  */
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#if defined (_WIN32)
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  {
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    char buf[MAX_PATH];
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    char* basename;
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    DWORD len = GetFullPathName (filename, MAX_PATH, buf, &basename);
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    if (len == 0 || len > MAX_PATH - 1)
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      return strdup (filename);
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    else
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      {
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        /* The file system is case-preserving but case-insensitive,
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           Canonicalize to lowercase, using the codepage associated
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           with the process locale.  */
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        CharLowerBuff (buf, len);
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        return strdup (buf);
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      }
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  }
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#endif
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  /* This system is a lost cause, just duplicate the filename.  */
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  return strdup (filename);
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}

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