Line data    Source code

       1             : /* basename.c -- return the last element in a file name
       2             : 
       3             :    Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2016 Free Software
       4             :    Foundation, Inc.
       5             : 
       6             :    This program is free software: you can redistribute it and/or modify
       7             :    it under the terms of the GNU General Public License as published by
       8             :    the Free Software Foundation; either version 3 of the License, or
       9             :    (at your option) any later version.
      10             : 
      11             :    This program 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 General Public License for more details.
      15             : 
      16             :    You should have received a copy of the GNU General Public License
      17             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
      18             : 
      19             : #include <config.h>
      20             : 
      21             : #include "dirname.h"
      22             : 
      23             : #include <string.h>
      24             : 
      25             : /* Return the address of the last file name component of NAME.  If
      26             :    NAME has no relative file name components because it is a file
      27             :    system root, return the empty string.  */
      28             : 
      29             : char *
      30           0 : last_component (char const *name)
      31             : {
      32           0 :   char const *base = name + FILE_SYSTEM_PREFIX_LEN (name);
      33             :   char const *p;
      34           0 :   bool saw_slash = false;
      35             : 
      36           0 :   while (ISSLASH (*base))
      37           0 :     base++;
      38             : 
      39           0 :   for (p = base; *p; p++)
      40             :     {
      41           0 :       if (ISSLASH (*p))
      42           0 :         saw_slash = true;
      43           0 :       else if (saw_slash)
      44             :         {
      45           0 :           base = p;
      46           0 :           saw_slash = false;
      47             :         }
      48             :     }
      49             : 
      50           0 :   return (char *) base;
      51             : }
      52             : 
      53             : /* Return the length of the basename NAME.  Typically NAME is the
      54             :    value returned by base_name or last_component.  Act like strlen
      55             :    (NAME), except omit all trailing slashes.  */
      56             : 
      57             : size_t
      58           0 : base_len (char const *name)
      59             : {
      60             :   size_t len;
      61           0 :   size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name);
      62             : 
      63           0 :   for (len = strlen (name);  1 < len && ISSLASH (name[len - 1]);  len--)
      64           0 :     continue;
      65             : 
      66             :   if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1
      67             :       && ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2])
      68             :     return 2;
      69             : 
      70             :   if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len
      71             :       && len == prefix_len && ISSLASH (name[prefix_len]))
      72             :     return prefix_len + 1;
      73             : 
      74           0 :   return len;
      75             : }