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