xref: /dflybsd-src/contrib/cvs-1.12/lib/strnlen1.c (revision 86d7f5d305c6adaa56ff4582ece9859d73106103)

/* Find the length of STRING + 1, but scan at most MAXLEN bytes.
   Copyright (C) 2005 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU Library General Public License as published
   by the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
   USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

/* Specification.  */
#include "strnlen1.h"

#include <string.h>

/* Find the length of STRING + 1, but scan at most MAXLEN bytes.
   If no '\0' terminator is found in that many characters, return MAXLEN.  */
/* This is the same as strnlen (string, maxlen - 1) + 1.  */
size_t
strnlen1 (const char *string, size_t maxlen)
{
  const char *end = memchr (string, '\0', maxlen);
  if (end != NULL)
    return end - string + 1;
  else
    return maxlen;
}