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pathaccess.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2007 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                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
/*
 * Glenn Fowler
 * AT&T Bell Laboratories
 *
 * return path to file a/b with access mode using : separated dirs
 * both a and b may be 0
 * if a==".." then relative paths in dirs are ignored
 * if (mode&PATH_REGULAR) then path must not be a directory
 * if (mode&PATH_ABSOLUTE) then path must be rooted
 * path returned in path buffer
 */

#include <ast.h>

char*
pathaccess(register char* path, register const char* dirs, const char* a, const char* b, register int mode)
{
      int         sib = a && a[0] == '.' && a[1] == '.' && a[2] == 0;
      int         sep = ':';
      char        cwd[PATH_MAX];

      do
      {
            dirs = pathcat(path, dirs, sep, a, b);
            pathcanon(path, 0);
            if ((!sib || *path == '/') && pathexists(path, mode))
            {
                  if (*path == '/' || !(mode & PATH_ABSOLUTE))
                        return path;
                  dirs = getcwd(cwd, sizeof(cwd));
                  sep = 0;
            }
      } while (dirs);
      return 0;
}

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