strnlen.c

   1 /* Find the length of STRING, but scan at most MAXLEN characters.
   2    Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
   3    Written by Simon Josefsson.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #include <config.h>
  20
  21 #include <string.h>
  22
  23 /* Find the length of STRING, but scan at most MAXLEN characters.
  24    If no '\0' terminator is found in that many characters, return MAXLEN.  */
  25
  26 size_t
  27 strnlen (const char *string, size_t maxlen)
  28 {
  29   const char *end = memchr (string, '\0', maxlen);
  30   return end ? (size_t) (end - string) : maxlen;
  31 }