gnulib/import/strnlen1.c

   1 /* Find the length of STRING + 1, but scan at most MAXLEN bytes.
   2    Copyright (C) 2005-2006, 2009-2019 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 3 of the License, or
   7    (at your option) 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, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 /* Specification.  */
  20 #include "strnlen1.h"
  21
  22 #include <string.h>
  23
  24 /* Find the length of STRING + 1, but scan at most MAXLEN bytes.
  25    If no '\0' terminator is found in that many characters, return MAXLEN.  */
  26 /* This is the same as strnlen (string, maxlen - 1) + 1.  */
  27 size_t
  28 strnlen1 (const char *string, size_t maxlen)
  29 {
  30   const char *end = (const char *) memchr (string, '\0', maxlen);
  31   if (end != NULL)
  32     return end - string + 1;
  33   else
  34     return maxlen;
  35 }