1  /* basename.c -- return the last element in a file name
       2  
       3     Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2023 Free Software
       4     Foundation, Inc.
       5  
       6     This file is free software: you can redistribute it and/or modify
       7     it under the terms of the GNU Lesser General Public License as
       8     published by the Free Software Foundation; either version 2.1 of the
       9     License, or (at your option) any later version.
      10  
      11     This file is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14     GNU Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public License
      17     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <config.h>
      20  
      21  /* Specification.  */
      22  #include "basename-lgpl.h"
      23  
      24  #include <string.h>
      25  
      26  #include "filename.h"
      27  
      28  char *
      29  last_component (char const *name)
      30  {
      31    char const *base = name + FILE_SYSTEM_PREFIX_LEN (name);
      32    char const *p;
      33    bool last_was_slash = false;
      34  
      35    while (ISSLASH (*base))
      36      base++;
      37  
      38    for (p = base; *p; p++)
      39      {
      40        if (ISSLASH (*p))
      41          last_was_slash = true;
      42        else if (last_was_slash)
      43          {
      44            base = p;
      45            last_was_slash = false;
      46          }
      47      }
      48  
      49    return (char *) base;
      50  }
      51  
      52  size_t
      53  base_len (char const *name)
      54  {
      55    size_t len;
      56    size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name);
      57  
      58    for (len = strlen (name);  1 < len && ISSLASH (name[len - 1]);  len--)
      59      continue;
      60  
      61    if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1
      62        && ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2])
      63      return 2;
      64  
      65    if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len
      66        && len == prefix_len && ISSLASH (name[prefix_len]))
      67      return prefix_len + 1;
      68  
      69    return len;
      70  }