CMakeLua/Utilities/cmtar/compat/dirname.c

   1 /*  $OpenBSD: dirname.c,v 1.4 1999/05/30 17:10:30 espie Exp $  */
   2
   3 /*
   4  * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  19  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
  21  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  27  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static char rcsid[] = "$OpenBSD: dirname.c,v 1.4 1999/05/30 17:10:30 espie Exp $";
  32 const char* libtar_compat_dirname_getrcsid() { return rcsid; }
  33 #endif /* not lint */
  34
  35 #include <errno.h>
  36 #include <string.h>
  37 #include <libtar/compat.h>
  38 #include <libtarint/internal.h>
  39
  40 char *
  41 openbsd_dirname(path)
  42   const char *path;
  43 {
  44   static char bname[TAR_MAXPATHLEN];
  45   register const char *endp;
  46
  47   /* Empty or NULL string gets treated as "." */
  48   if (path == NULL || *path == '\0') {
  49     (void)strcpy(bname, ".");
  50     return(bname);
  51   }
  52
  53   /* Strip trailing slashes */
  54   endp = path + strlen(path) - 1;
  55   while (endp > path && *endp == '/')
  56     endp--;
  57
  58   /* Find the start of the dir */
  59   while (endp > path && *endp != '/')
  60     endp--;
  61
  62   /* Either the dir is "/" or there are no slashes */
  63   if (endp == path) {
  64     (void)strcpy(bname, *endp == '/' ? "/" : ".");
  65     return(bname);
  66   } else {
  67     do {
  68       endp--;
  69     } while (endp > path && *endp == '/');
  70   }
  71
  72   if (endp - path + 1 > sizeof(bname)) {
  73     errno = ENAMETOOLONG;
  74     return(NULL);
  75   }
  76   (void)strncpy(bname, path, endp - path + 1);
  77   bname[endp - path + 1] = '\0';
  78   return(bname);
  79 }