contrib/cvs-1.12/lib/strnlen1.c

   1 /* Find the length of STRING + 1, but scan at most MAXLEN bytes.
   2    Copyright (C) 2005 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify it
   5    under the terms of the GNU Library General Public License as published
   6    by the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with this program; if not, write to the Free Software
  16    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  17    USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 # include <config.h>
  21 #endif
  22
  23 /* Specification.  */
  24 #include "strnlen1.h"
  25
  26 #include <string.h>
  27
  28 /* Find the length of STRING + 1, but scan at most MAXLEN bytes.
  29    If no '\0' terminator is found in that many characters, return MAXLEN.  */
  30 /* This is the same as strnlen (string, maxlen - 1) + 1.  */
  31 size_t
  32 strnlen1 (const char *string, size_t maxlen)
  33 {
  34   const char *end = memchr (string, '\0', maxlen);
  35   if (end != NULL)
  36     return end - string + 1;
  37   else
  38     return maxlen;
  39 }