1 /* @(#)strnlen.c 1.3 10/05/07 Copyright 2010 J. Schilling */ 2 /* 3 * strnlen() to be used if missing in libc 4 * 5 * Copyright (c) 2010 J. Schilling 6 */ 7 /* 8 * The contents of this file are subject to the terms of the 9 * Common Development and Distribution License, Version 1.0 only 10 * (the "License"). You may not use this file except in compliance 11 * with the License. 12 * 13 * See the file CDDL.Schily.txt in this distribution for details. 14 * A copy of the CDDL is also available via the Internet at 15 * http://www.opensource.org/licenses/cddl1.txt 16 * 17 * When distributing Covered Code, include this CDDL HEADER in each 18 * file and include the License file CDDL.Schily.txt from this distribution. 19 */ 20 21 #include <schily/standard.h> 22 #include <schily/unistd.h> 23 #include <schily/schily.h> 24 25 #ifndef HAVE_STRNLEN 26 27 EXPORT size_t strnlen(s,len)28strnlen(s, len) 29 register const char *s; 30 register size_t len; 31 { 32 register const char *rs = s; 33 34 if (len == 0) 35 return (0); 36 37 while (*rs++ != '\0' && --len > 0) 38 ; 39 if (len == 0) 40 return (rs - s); 41 return (--rs - s); 42 } 43 44 #endif 45