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
51 char *
findcc(const char * progname)52 findcc(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