lib/basename-lgpl.h

   1 /* Extract the last component (base name) of a file name.
   2
   3    Copyright (C) 1998, 2001, 2003-2006, 2009-2024 Free Software Foundation,
   4    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 #ifndef _BASENAME_LGPL_H
  20 #define _BASENAME_LGPL_H
  21
  22 /* This file uses _GL_ATTRIBUTE_PURE.  */
  23 #if !_GL_CONFIG_H_INCLUDED
  24  #error "Please include config.h first."
  25 #endif
  26
  27 #include <stddef.h>
  28
  29 #ifndef DOUBLE_SLASH_IS_DISTINCT_ROOT
  30 # define DOUBLE_SLASH_IS_DISTINCT_ROOT 0
  31 #endif
  32
  33 #ifdef __cplusplus
  34 extern "C" {
  35 #endif
  36
  37
  38 /* Return the address of the last file name component of FILENAME.
  39    If FILENAME has some trailing slash(es), they are considered to be
  40    part of the last component.
  41    If FILENAME has no relative file name components because it is a file
  42    system root, return the empty string.
  43    Examples:
  44               FILENAME      RESULT
  45               "foo.c"       "foo.c"
  46               "foo/bar.c"   "bar.c"
  47               "/foo/bar.c"  "bar.c"
  48               "foo/bar/"    "bar/"
  49               "foo/bar//"   "bar//"
  50               "/"           ""
  51               "//"          ""
  52               ""            ""
  53    The return value is a tail of the given FILENAME; do NOT free() it!  */
  54
  55 /* This function was traditionally called 'basename', but we avoid this
  56    function name because
  57      * Various platforms have different functions in their libc.
  58        In particular, the glibc basename(), defined in <string.h>, does
  59        not consider trailing slashes to be part of the component:
  60               FILENAME      RESULT
  61               "foo/bar/"    ""
  62               "foo/bar//"   ""
  63      * The 'basename' command eliminates trailing slashes and for a root
  64        produces a non-empty result:
  65               FILENAME      RESULT
  66               "foo/bar/"    "bar"
  67               "foo/bar//"   "bar"
  68               "/"           "/"
  69               "//"          "/"
  70  */
  71 extern char *last_component (char const *filename) _GL_ATTRIBUTE_PURE;
  72
  73 /* Return the length of the basename FILENAME.
  74    Typically FILENAME is the value returned by base_name or last_component.
  75    Act like strlen (FILENAME), except omit all trailing slashes.  */
  76 extern size_t base_len (char const *filename) _GL_ATTRIBUTE_PURE;
  77
  78
  79 #ifdef __cplusplus
  80 } /* extern "C" */
  81 #endif
  82
  83 #endif /* _BASENAME_LGPL_H */