lib/stripslash.c

   1 /* stripslash.c -- remove redundant trailing slashes from a file name
   2
   3    Copyright (C) 1990, 2001, 2003-2006, 2009-2020 Free Software Foundation,
   4    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 <https://www.gnu.org/licenses/>.  */
  18
  19 #include <config.h>
  20
  21 #include "dirname.h"
  22
  23 /* Remove trailing slashes from FILE.  Return true if a trailing slash
  24    was removed.  This is useful when using file name completion from a
  25    shell that adds a "/" after directory names (such as tcsh and
  26    bash), because on symlinks to directories, several system calls
  27    have different semantics according to whether a trailing slash is
  28    present.  */
  29
  30 bool
  31 strip_trailing_slashes (char *file)
  32 {
  33   char *base = last_component (file);
  34   char *base_lim;
  35   bool had_slash;
  36
  37   /* last_component returns "" for file system roots, but we need to turn
  38      "///" into "/".  */
  39   if (! *base)
  40     base = file;
  41   base_lim = base + base_len (base);
  42   had_slash = (*base_lim != '\0');
  43   *base_lim = '\0';
  44   return had_slash;
  45 }