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resolvepath.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * resolvepath implementation
 */

#include <ast.h>
#include <error.h>

#if defined(__EXPORT__)
#define extern    __EXPORT__
#endif

extern char*
resolvepath(const char* file, char* path, size_t size)
{
      register char*    s;
      register int      n;
      register int      r;

      r = *file != '/';
      n = strlen(file) + r + 1;
      if (n >= size)
      {
#ifdef ENAMETOOLONG
            errno = ENAMETOOLONG;
#else
            errno = ENOMEM;
#endif
            return 0;
      }
      if (!r)
            s = path;
      else if (!getcwd(path, size - n))
            return 0;
      else
      {
            s = path + strlen(path);
            *s++ = '/';
      }
      strcpy(s, file);
      return pathcanon(path, PATH_PHYSICAL|PATH_DOTDOT|PATH_EXISTS) ? path : (char*)0;
}

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