tstrnlen.c - numtools - perform numerical operations on vectors and matrices in unix pipes
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       ---
       tstrnlen.c (1070B)
       ---
            1 /*        $OpenBSD: strnlen.c,v 1.9 2019/01/25 00:19:25 millert Exp $        */
            2 
            3 /*
            4  * Copyright (c) 2010 Todd C. Miller <millert@openbsd.org>
            5  *
            6  * Permission to use, copy, modify, and distribute this software for any
            7  * purpose with or without fee is hereby granted, provided that the above
            8  * copyright notice and this permission notice appear in all copies.
            9  *
           10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
           11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
           12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
           13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
           14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
           15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
           16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
           17  */
           18 
           19 #include <sys/types.h>
           20 
           21 #include <string.h>
           22 
           23 size_t
           24 strnlen(const char *str, size_t maxlen)
           25 {
           26         const char *cp;
           27 
           28         for (cp = str; maxlen != 0 && *cp != '\0'; cp++, maxlen--)
           29                 ;
           30 
           31         return (size_t)(cp - str);
           32 }