basename.c

/* basename.c -- return the last element in a file name

   Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2012 Free Software
   Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>  */

#include <config.h>

#include "dirname.h"

#include <string.h>
#include "xalloc.h"
#include "xstrndup.h"

char *
base_name(char const *name)
{
  char const *base = last_component(name);
  size_t length;

  /* If there is no last component, then name is a file system root or the
   * empty string: */
  if (! *base)
    return xstrndup(name, base_len(name));

  /* Collapse a sequence of trailing slashes into one.  */
  length = base_len(base);
  if (ISSLASH(base[length]))
    length++;

  /* On systems with drive letters, "a/b:c" must return "./b:c" rather
     than "b:c" to avoid confusion with a drive letter.  On systems
     with pure POSIX semantics, this is not an issue.  */
  if (FILE_SYSTEM_PREFIX_LEN(base)) {
      char *p;
	  p = (char *)xmalloc(length + 3);
      p[0] = '.';
      p[1] = '/';
      memcpy((p + 2), base, length);
      p[(length + 2)] = '\0';
      return p;
  }

  /* Finally, copy the basename: */
  return xstrndup(base, length);
}

/* EOF */