strnlen.c

/* Copyright Richard A. O'Keefe.
   Copyright (c) 2000 TXT DataKonsult Ab & Monty Program Ab
   Copyright (c) 2009-2011, Monty Program Ab

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are
   met:

   1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

   2. Redistributions in binary form must the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.

   THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND ANY
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   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
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*/

/*  File   : strnlen.c
    Author : Michael Widenius
    Updated: 20 April 1984
    Defines: strnlen.
    strnlen(s, len) returns the length of s or len if s is longer than len.
*/

#include "strings_def.h"

#ifndef HAVE_STRNLEN

size_t strnlen(register const char *s, register size_t maxlen)
{
  const char *end= (const char *)memchr(s, '\0', maxlen);
  return end ? (size_t) (end - s) : maxlen;
}

#endif