1  /* Find the length of STRING, but scan at most MAXLEN characters.
       2     Copyright (C) 2005-2007, 2009-2023 Free Software Foundation, Inc.
       3     Written by Simon Josefsson.
       4  
       5     This file is free software: you can redistribute it and/or modify
       6     it under the terms of the GNU Lesser General Public License as
       7     published by the Free Software Foundation; either version 2.1 of the
       8     License, or (at your option) any later version.
       9  
      10     This file 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 Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public License
      16     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <config.h>
      19  
      20  #include <string.h>
      21  
      22  /* Find the length of STRING, but scan at most MAXLEN characters.
      23     If no '\0' terminator is found in that many characters, return MAXLEN.  */
      24  
      25  size_t
      26  strnlen (const char *string, size_t maxlen)
      27  {
      28    const char *end = memchr (string, '\0', maxlen);
      29    return end ? (size_t) (end - string) : maxlen;
      30  }