kc3-lang/gnulib/lib/xgetcwd.c

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• Hash : f16f973a
  Author :
  Date : 2001-08-31T10:36:12
  

  Don't include pathmax.h.
  Include stdlib.h and unistd.h if available.
  Include xalloc.h.
  (xmalloc, xstrdup, free): Remove decls.
  (xgetcwd): Don't assume sizes fit in unsigned.
  Check for overflow when computing sizes.
  Simplify reallocation code.
  

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• lib/xgetcwd.c

• /* xgetcwd.c -- return current directory with unlimited length
     Copyright (C) 1992, 1996, 2000, 2001 Free Software Foundation, Inc.
  
     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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  
  /* Written by David MacKenzie <djm@gnu.ai.mit.edu>.  */
  
  #if HAVE_CONFIG_H
  # include <config.h>
  #endif
  
  #include <stdio.h>
  #include <errno.h>
  #ifndef errno
  extern int errno;
  #endif
  
  #include <sys/types.h>
  
  #if HAVE_STDLIB_H
  # include <stdlib.h>
  #endif
  #if HAVE_UNISTD_H
  # include <unistd.h>
  #endif
  
  #if HAVE_GETCWD
  char *getcwd ();
  #else
  char *getwd ();
  # define getcwd(Buf, Max) getwd (Buf)
  #endif
  
  #include "xalloc.h"
  
  /* Return the current directory, newly allocated, arbitrarily long.
     Return NULL and set errno on error. */
  
  char *
  xgetcwd ()
  {
  #if defined __GLIBC__ && __GLIBC__ >= 2
    return getcwd (NULL, 0);
  #else
    char *ret;
    size_t path_max;
    char buf[1024];
  
    errno = 0;
    ret = getcwd (buf, sizeof (buf));
    if (ret != NULL)
      return xstrdup (buf);
    if (errno != ERANGE)
      return NULL;
  
    path_max = 1 << 10;
  
    for (;;)
      {
        char *cwd = (char *) xmalloc (path_max);
        int save_errno;
  
        errno = 0;
        ret = getcwd (cwd, path_max);
        if (ret != NULL)
  	return ret;
        save_errno = errno;
        free (cwd);
        if (save_errno != ERANGE)
  	{
  	  errno = save_errno;
  	  return NULL;
  	}
  
        path_max *= 2;
        if (path_max == 0)
  	xalloc_die ();
      }
  #endif
  }
  

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