1/* $NetBSD: findcc.c,v 1.10 2021/08/20 06:36:10 rillig Exp $ */
2
3/*-
4 * Copyright (c) 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matthias Scheler.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#if HAVE_NBTOOL_CONFIG_H
33#include "nbtool_config.h"
34#endif
35
36#include <sys/cdefs.h>
37#if !defined(lint)
38__COPYRIGHT("@(#) Copyright (c) 1999 The NetBSD Foundation, Inc.\
39 All rights reserved.");
40__RCSID("$NetBSD: findcc.c,v 1.10 2021/08/20 06:36:10 rillig Exp $");
41#endif /* not lint */
42
43#include <sys/param.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48
49#include "findcc.h"
50
51char *
52findcc(const char *progname)
53{
54	char *cc;
55	const char *path, *dir;
56	char buffer[MAXPATHLEN];
57	size_t progname_len, dir_len;
58
59	progname_len = strcspn(progname, " ");
60
61	if (memchr(progname, '/', progname_len) != NULL) {
62		if ((cc = strndup(progname, progname_len)) == NULL)
63			return NULL;
64		if (access(cc, X_OK) == 0)
65			return cc;
66		free(cc);
67		return NULL;
68	}
69
70	if ((path = getenv("PATH")) == NULL)
71		return NULL;
72
73	for (dir = path; *dir != '\0'; ) {
74		dir_len = strcspn(dir, ":");
75
76		if ((size_t)snprintf(buffer, sizeof(buffer), "%.*s/%.*s",
77			(int)dir_len, dir, (int)progname_len, progname)
78		    < sizeof(buffer)
79		    && access(buffer, X_OK) == 0)
80			return strdup(buffer);
81
82		dir += dir_len;
83		if (*dir == ':')
84			dir++;
85	}
86
87	return NULL;
88}
89