source: vendor/bash/3.1/lib/sh/strnlen.c

/* Copyright (C) 2004 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

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

#if !defined (HAVE_STRNLEN)

#include <sys/types.h>

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif

#include <stdc.h>

/* Find the length of S, but scan at most MAXLEN characters.  If no '\0'
   terminator is found within the first MAXLEN characters, return MAXLEN. */
size_t
strnlen (s, maxlen)
     register const char *s;
     size_t maxlen;
{
  register const char *e;
  size_t n;

  for (e = s, n = 0; *e && n < maxlen; e++, n++)
    ;
  return n;
}
#endif