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 #include <sys/cdefs.h> 19 __RCSID("$NetBSD: strnlen1.c,v 1.2 2016/05/17 14:00:09 christos Exp $"); 20 21 22 #ifdef HAVE_CONFIG_H 23 # include <config.h> 24 #endif 25 26 /* Specification. */ 27 #include "strnlen1.h" 28 29 #include <string.h> 30 31 /* Find the length of STRING + 1, but scan at most MAXLEN bytes. 32 If no '\0' terminator is found in that many characters, return MAXLEN. */ 33 /* This is the same as strnlen (string, maxlen - 1) + 1. */ 34 size_t 35 strnlen1 (const char *string, size_t maxlen) 36 { 37 const char *end = memchr (string, '\0', maxlen); 38 if (end != NULL) 39 return end - string + 1; 40 else 41 return maxlen; 42 } 43