File: fnsearch.c

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/*
 *  fnsearch.c
 *
 *  $Id$
 *
 *  Search a file in a search path
 *  
 *  This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
 *  project.
 *  
 *  Copyright (C) 1998-2012 OpenLink Software
 *  
 *  This project 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; only version 2 of the License, dated June 1991.
 *  
 *  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 St, Fifth Floor, Boston, MA 02110-1301 USA
 *  
 *  
*/

#include "libutil.h"

#ifdef DOSFS
#define PATHSEP		';'
#define SLASH		'\\'
#else
#define PATHSEP		':'
#define SLASH		'/'
#endif


char *
fnsearch (const char *filename, const char *path)
{
  static char *namebuf = NULL;
  static size_t namebuf_size = 0;
  size_t new_size;
  const char *cp;
  char *np;

  if (path == NULL)
    return NULL;
  cp = path;

  /* Avoid a call to realloc, whenever possible */
  new_size = strlen(path) + strlen(filename) + 2;
  if (namebuf_size < new_size)
    {
      /* Ask more than enough space to store the result */
      /* (realloc of NULL behaves like malloc) */
      np = realloc(namebuf, new_size);
      if (np == NULL)
        return NULL;
      namebuf_size = new_size;
      namebuf = np;
    }
  else
    np = namebuf;

  while (1)
    {
      if (*cp == PATHSEP || *cp == '\0')
	{
	  *np++ = SLASH;
	  strcpy (np, filename);
	  if (access (namebuf, 0) == 0)
	    return namebuf;
	  if (*cp++ == '\0')
	    return NULL;
	  np = namebuf;
	}
      else
	*np++ = *cp++;
    }
}