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
39 char*
pathaccess(char * path,const char * dirs,const char * a,const char * b,int mode)40 pathaccess(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
49 char*
pathaccess_20100601(register const char * dirs,const char * a,const char * b,register int mode,register char * path,size_t size)50 pathaccess_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