libs/port/strnlen.c

   1 /*
   2  * strnlen function
   3  *
   4  * Copyright 2017 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #ifndef HAVE_STRNLEN
  25 size_t strnlen( const char *str, size_t maxlen )
  26 {
  27     const char *ptr = memchr( str, 0, maxlen );
  28     if (!ptr) return maxlen;
  29     return ptr - str;
  30 }
  31 #endif /* HAVE_STRNLEN */