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      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 *
     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