path.c revision 1.8 
1/*	$OpenBSD: path.c,v 1.8 2019/12/17 17:16:32 guenther Exp $	*/
2
3/*
4 * Copyright (c) 2013 Kurt Miller <kurt@intricatesoftware.com>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <sys/types.h>
20#include "path.h"
21#include "util.h"
22
23char **
24_dl_split_path(const char *searchpath)
25{
26	int pos = 0;
27	int count = 1;
28	const char *pp, *p_begin;
29	char **retval;
30
31	if (searchpath == NULL)
32		return (NULL);
33
34	/* Count ':' or ';' in searchpath */
35	pp = searchpath;
36	while (*pp) {
37		if (*pp == ':' || *pp == ';')
38			count++;
39		pp++;
40	}
41
42	/* one more for NULL entry */
43	count++;
44
45	retval = _dl_reallocarray(NULL, count, sizeof(*retval));
46	if (retval == NULL)
47		_dl_oom();
48
49	pp = searchpath;
50	while (pp) {
51		p_begin = pp;
52		while (*pp != '\0' && *pp != ':' && *pp != ';')
53			pp++;
54
55		if (p_begin != pp) {
56			retval[pos] = _dl_malloc(pp - p_begin + 1);
57			if (retval[pos] == NULL)
58				_dl_oom();
59
60			_dl_bcopy(p_begin, retval[pos], pp - p_begin);
61			retval[pos++][pp - p_begin] = '\0';
62		}
63
64		if (*pp)
65			pp++;
66		else
67			pp = NULL;
68	}
69
70	retval[pos] = NULL;
71	return (retval);
72}
73
74void
75_dl_free_path(char **path)
76{
77	char **p = path;
78
79	if (path == NULL)
80		return;
81
82	while (*p != NULL)
83		_dl_free(*p++);
84
85	_dl_free(path);
86}
87