lib/strnlen1.c

   1 /* Find the length of STRING + 1, but scan at most MAXLEN bytes.
   2    Copyright (C) 2005-2006 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #include "strnlen1.h"
  22
  23 #include <string.h>
  24
  25 /* Find the length of STRING + 1, but scan at most MAXLEN bytes.
  26    If no '\0' terminator is found in that many characters, return MAXLEN.  */
  27 /* This is the same as strnlen (string, maxlen - 1) + 1.  */
  28 size_t
  29 strnlen1 (const char *string, size_t maxlen)
  30 {
  31   const char *end = (const char *) memchr (string, '\0', maxlen);
  32   if (end != NULL)
  33     return end - string + 1;
  34   else
  35     return maxlen;
  36 }