openbsd-compat/basename.c

   1 /*      $OpenBSD: basename.c,v 1.14 2005/08/08 08:05:33 espie Exp $     */
   2
   3 /*
   4  * Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 /* OPENBSD ORIGINAL: lib/libc/gen/basename.c */
  20
  21 #include "includes.h"
  22 #ifndef HAVE_BASENAME
  23
  24 char *
  25 basename(const char *path)
  26 {
  27         static char bname[MAXPATHLEN];
  28         size_t len;
  29         const char *endp, *startp;
  30
  31         /* Empty or NULL string gets treated as "." */
  32         if (path == NULL || *path == '\0') {
  33                 bname[0] = '.';
  34                 bname[1] = '\0';
  35                 return (bname);
  36         }
  37
  38         /* Strip any trailing slashes */
  39         endp = path + strlen(path) - 1;
  40         while (endp > path && *endp == '/')
  41                 endp--;
  42
  43         /* All slashes becomes "/" */
  44         if (endp == path && *endp == '/') {
  45                 bname[0] = '/';
  46                 bname[1] = '\0';
  47                 return (bname);
  48         }
  49
  50         /* Find the start of the base */
  51         startp = endp;
  52         while (startp > path && *(startp - 1) != '/')
  53                 startp--;
  54
  55         len = endp - startp + 1;
  56         if (len >= sizeof(bname)) {
  57                 errno = ENAMETOOLONG;
  58                 return (NULL);
  59         }
  60         memcpy(bname, startp, len);
  61         bname[len] = '\0';
  62         return (bname);
  63 }
  64
  65 #endif /* !defined(HAVE_BASENAME) */