basename-lgpl.c

/* basename-lgpl.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>

/* Return the address of the last file name component of NAME.  If NAME
 * has no relative file name components because it is a file system root,
 * then return the empty string: */
char *
last_component(char const *name)
{
  char const *base = (name + FILE_SYSTEM_PREFIX_LEN(name));
  char const *p;
  bool saw_slash = false;

  while (ISSLASH(*base))
    base++;

  for (p = base; *p; p++)
    {
      if (ISSLASH(*p))
        saw_slash = true;
      else if (saw_slash)
        {
          base = p;
          saw_slash = false;
        }
    }

  return (char *)base;
}

/* Return the length of the basename NAME.  Typically NAME is the value
 * returned by base_name or last_component.  Act like strlen(NAME), except
 * omit all trailing slashes: */
size_t
base_len(char const *name)
{
  size_t len;
  size_t prefix_len = FILE_SYSTEM_PREFIX_LEN(name);

  for (len = strlen(name);  (1 < len) && ISSLASH(name[len - 1]);  len--)
    continue;

  if (DOUBLE_SLASH_IS_DISTINCT_ROOT && (len == 1)
      && ISSLASH(name[0]) && ISSLASH(name[1]) && ! name[2])
    return 2;

  if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len
      && (len == prefix_len) && ISSLASH(name[prefix_len]))
    return (prefix_len + 1);

  return len;
}

/* EOF */