1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                 Eclipse Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*          http://www.eclipse.org/org/documents/epl-v10.html           *
11*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#pragma prototyped
23/*
24 * Glenn Fowler
25 * AT&T Bell Laboratories
26 *
27 * return path to file a/b with access mode using : separated dirs
28 * both a and b may be 0
29 * if a==".." then relative paths in dirs are ignored
30 * if (mode&PATH_REGULAR) then path must not be a directory
31 * if (mode&PATH_ABSOLUTE) then path must be rooted
32 * path returned in path buffer
33 */
34
35#define _AST_API_H	1
36
37#include <ast.h>
38
39char*
40pathaccess(char* path, const char* dirs, const char* a, const char* b, int mode)
41{
42	return pathaccess_20100601(dirs, a, b, mode, path, PATH_MAX);
43}
44
45#undef	_AST_API_H
46
47#include <ast_api.h>
48
49char*
50pathaccess_20100601(register const char* dirs, const char* a, const char* b, register int mode, register char* path, size_t size)
51{
52	int		sib = a && a[0] == '.' && a[1] == '.' && a[2] == 0;
53	int		sep = ':';
54	char		cwd[PATH_MAX];
55
56	do
57	{
58		dirs = pathcat(dirs, sep, a, b, path, size);
59		pathcanon(path, size, 0);
60		if ((!sib || *path == '/') && pathexists(path, mode))
61		{
62			if (*path == '/' || !(mode & PATH_ABSOLUTE))
63				return path;
64			dirs = getcwd(cwd, sizeof(cwd));
65			sep = 0;
66		}
67	} while (dirs);
68	return 0;
69}
70