/*	$NetBSD: basename.c,v 1.11 2014/07/16 10:52:26 christos Exp $	*/

/*-
 * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Klaus Klein and Jason R. Thorpe.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include <sys/param.h>
#include <libgen.h>
#include <string.h>
#include <limits.h>
#include <string.h>

static size_t xbasename_r(const char *path, char *buf, size_t buflen) {
  const char *startp, *endp;
  size_t len;

  /*
   * If `path' is a null pointer or points to an empty string,
   * return a pointer to the string ".".
   */
  if (path == NULL || *path == '\0') {
    startp = ".";
    len = 1;
    goto out;
  }

  /* Strip trailing slashes, if any. */
  endp = path + strlen(path) - 1;
  while (endp != path && *endp == '/')
    endp--;

  /* Only slashes -> "/" */
  if (endp == path && *endp == '/') {
    startp = "/";
    len = 1;
    goto out;
  }

  /* Now find the beginning of this (final) component. */
  for (startp = endp; startp > path && *(startp - 1) != '/'; startp--)
    continue;

  /* ...and copy the result into the result buffer. */
  len = (endp - startp) + 1 /* last char */;
out:
  if (buf != NULL && buflen != 0) {
    buflen = MIN(len, buflen - 1);
    memcpy(buf, startp, buflen);
    buf[buflen] = '\0';
  }
  return len;
}

char *basename(char *path) {
  static char result[PATH_MAX];

  (void)xbasename_r(path, result, sizeof(result));
  return result;
}
