contrib/bmake/dirname.c

   1 /*      $NetBSD: dirname.c,v 1.13 2014/07/16 10:52:26 christos Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Klaus Klein and Jason R. Thorpe.
   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 #ifdef HAVE_CONFIG_H
  33 # include <config.h>
  34 #endif
  35 #ifndef HAVE_DIRNAME
  36
  37 #include <sys/cdefs.h>
  38 #include <sys/param.h>
  39 #ifdef HAVE_LIBGEN_H
  40 #include <libgen.h>
  41 #endif
  42 #ifdef HAVE_LIMITS_H
  43 #include <limits.h>
  44 #endif
  45 #ifdef HAVE_STRING_H
  46 #include <string.h>
  47 #endif
  48 #ifndef PATH_MAX
  49 # define PATH_MAX 1024
  50 #endif
  51 #ifndef MIN
  52 # define MIN(a, b) ((a < b) ? a : b)
  53 #endif
  54
  55
  56 static size_t
  57 xdirname_r(const char *path, char *buf, size_t buflen)
  58 {
  59         const char *endp;
  60         size_t len;
  61
  62         /*
  63          * If `path' is a null pointer or points to an empty string,
  64          * return a pointer to the string ".".
  65          */
  66         if (path == NULL || *path == '\0') {
  67                 path = ".";
  68                 len = 1;
  69                 goto out;
  70         }
  71
  72         /* Strip trailing slashes, if any. */
  73         endp = path + strlen(path) - 1;
  74         while (endp != path && *endp == '/')
  75                 endp--;
  76
  77         /* Find the start of the dir */
  78         while (endp > path && *endp != '/')
  79                 endp--;
  80
  81         if (endp == path) {
  82                 path = *endp == '/' ? "/" : ".";
  83                 len = 1;
  84                 goto out;
  85         }
  86
  87         do
  88                 endp--;
  89         while (endp > path && *endp == '/');
  90
  91         len = endp - path + 1;
  92 out:
  93         if (buf != NULL && buflen != 0) {
  94                 buflen = MIN(len, buflen - 1);
  95                 memcpy(buf, path, buflen);
  96                 buf[buflen] = '\0';
  97         }
  98         return len;
  99 }
 100
 101 char *
 102 dirname(char *path)
 103 {
 104         static char result[PATH_MAX];
 105         (void)xdirname_r(path, result, sizeof(result));
 106         return result;
 107 }
 108
 109 #ifdef MAIN
 110 #include <stdlib.h>
 111 #include <stdio.h>
 112
 113 int
 114 main(int argc, char *argv[])
 115 {
 116         printf("%s\n", dirname(argv[1]));
 117         exit(0);
 118 }
 119 #endif
 120 #endif