usr.bin/mkdep/findcc.c

   1 /* $NetBSD: findcc.c,v 1.6 2011/09/04 20:30:06 joerg 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 1.6 2011/09/04 20:30:06 joerg 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   *path, *dir, *next;
  55         char   buffer[MAXPATHLEN];
  56
  57         if ((next = strchr(progname, ' ')) != NULL) {
  58                 *next = '\0';
  59         }
  60
  61         if (strchr(progname, '/') != NULL)
  62                 return access(progname, X_OK) ? NULL : strdup(progname);
  63
  64         if (((path = getenv("PATH")) == NULL) ||
  65             ((path = strdup(path)) == NULL))
  66                 return NULL;
  67
  68         dir = path;
  69         while (dir != NULL) {
  70                 if ((next = strchr(dir, ':')) != NULL)
  71                         *next++ = '\0';
  72
  73                 if (snprintf(buffer, sizeof(buffer),
  74                     "%s/%s", dir, progname) < (int)sizeof(buffer)) {
  75                         if (!access(buffer, X_OK)) {
  76                                 free(path);
  77                                 return strdup(buffer);
  78                         }
  79                 }
  80                 dir = next;
  81         }
  82
  83         free(path);
  84         return NULL;
  85 }
  86