199767f8919635c4928607450d9e0abb932109ceToomas Soome/*-
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Copyright (c) 1990, 1993
199767f8919635c4928607450d9e0abb932109ceToomas Soome * The Regents of the University of California. All rights reserved.
199767f8919635c4928607450d9e0abb932109ceToomas Soome *
199767f8919635c4928607450d9e0abb932109ceToomas Soome * This code is derived from software contributed to Berkeley by
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Mike Hibler and Chris Torek.
199767f8919635c4928607450d9e0abb932109ceToomas Soome *
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Redistribution and use in source and binary forms, with or without
199767f8919635c4928607450d9e0abb932109ceToomas Soome * modification, are permitted provided that the following conditions
199767f8919635c4928607450d9e0abb932109ceToomas Soome * are met:
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 1. Redistributions of source code must retain the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome * notice, this list of conditions and the following disclaimer.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome * notice, this list of conditions and the following disclaimer in the
199767f8919635c4928607450d9e0abb932109ceToomas Soome * documentation and/or other materials provided with the distribution.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 3. Neither the name of the University nor the names of its contributors
199767f8919635c4928607450d9e0abb932109ceToomas Soome * may be used to endorse or promote products derived from this software
199767f8919635c4928607450d9e0abb932109ceToomas Soome * without specific prior written permission.
199767f8919635c4928607450d9e0abb932109ceToomas Soome *
199767f8919635c4928607450d9e0abb932109ceToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
199767f8919635c4928607450d9e0abb932109ceToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
199767f8919635c4928607450d9e0abb932109ceToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
199767f8919635c4928607450d9e0abb932109ceToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
199767f8919635c4928607450d9e0abb932109ceToomas Soome * SUCH DAMAGE.
199767f8919635c4928607450d9e0abb932109ceToomas Soome */
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#if defined(LIBC_SCCS) && !defined(lint)
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic char sccsid[] = "@(#)memset.c 8.1 (Berkeley) 6/4/93";
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif /* LIBC_SCCS and not lint */
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/cdefs.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome__FBSDID("$FreeBSD$");
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/types.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <limits.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define wsize sizeof(u_int)
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define wmask (wsize - 1)
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#ifdef BZERO
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <strings.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define RETURN return
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define VAL 0
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define WIDEVAL 0
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomevoid
199767f8919635c4928607450d9e0abb932109ceToomas Soomebzero(void *dst0, size_t length)
199767f8919635c4928607450d9e0abb932109ceToomas Soome#else
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <string.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define RETURN return (dst0)
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define VAL c0
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define WIDEVAL c
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomevoid *
199767f8919635c4928607450d9e0abb932109ceToomas Soomememset(void *dst0, int c0, size_t length)
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome size_t t;
199767f8919635c4928607450d9e0abb932109ceToomas Soome#ifndef BZERO
199767f8919635c4928607450d9e0abb932109ceToomas Soome u_int c;
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif
199767f8919635c4928607450d9e0abb932109ceToomas Soome u_char *dst;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome dst = dst0;
199767f8919635c4928607450d9e0abb932109ceToomas Soome /*
199767f8919635c4928607450d9e0abb932109ceToomas Soome * If not enough words, just fill bytes. A length >= 2 words
199767f8919635c4928607450d9e0abb932109ceToomas Soome * guarantees that at least one of them is `complete' after
199767f8919635c4928607450d9e0abb932109ceToomas Soome * any necessary alignment. For instance:
199767f8919635c4928607450d9e0abb932109ceToomas Soome *
199767f8919635c4928607450d9e0abb932109ceToomas Soome * |-----------|-----------|-----------|
199767f8919635c4928607450d9e0abb932109ceToomas Soome * |00|01|02|03|04|05|06|07|08|09|0A|00|
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ^---------------------^
199767f8919635c4928607450d9e0abb932109ceToomas Soome * dst dst+length-1
199767f8919635c4928607450d9e0abb932109ceToomas Soome *
199767f8919635c4928607450d9e0abb932109ceToomas Soome * but we use a minimum of 3 here since the overhead of the code
199767f8919635c4928607450d9e0abb932109ceToomas Soome * to do word writes is substantial.
199767f8919635c4928607450d9e0abb932109ceToomas Soome */
199767f8919635c4928607450d9e0abb932109ceToomas Soome if (length < 3 * wsize) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome while (length != 0) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome *dst++ = VAL;
199767f8919635c4928607450d9e0abb932109ceToomas Soome --length;
199767f8919635c4928607450d9e0abb932109ceToomas Soome }
199767f8919635c4928607450d9e0abb932109ceToomas Soome RETURN;
199767f8919635c4928607450d9e0abb932109ceToomas Soome }
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#ifndef BZERO
199767f8919635c4928607450d9e0abb932109ceToomas Soome if ((c = (u_char)c0) != 0) { /* Fill the word. */
199767f8919635c4928607450d9e0abb932109ceToomas Soome c = (c << 8) | c; /* u_int is 16 bits. */
199767f8919635c4928607450d9e0abb932109ceToomas Soome#if UINT_MAX > 0xffff
199767f8919635c4928607450d9e0abb932109ceToomas Soome c = (c << 16) | c; /* u_int is 32 bits. */
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif
199767f8919635c4928607450d9e0abb932109ceToomas Soome#if UINT_MAX > 0xffffffff
199767f8919635c4928607450d9e0abb932109ceToomas Soome c = (c << 32) | c; /* u_int is 64 bits. */
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif
199767f8919635c4928607450d9e0abb932109ceToomas Soome }
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Align destination by filling in bytes. */
199767f8919635c4928607450d9e0abb932109ceToomas Soome if ((t = (long)dst & wmask) != 0) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome t = wsize - t;
199767f8919635c4928607450d9e0abb932109ceToomas Soome length -= t;
199767f8919635c4928607450d9e0abb932109ceToomas Soome do {
199767f8919635c4928607450d9e0abb932109ceToomas Soome *dst++ = VAL;
199767f8919635c4928607450d9e0abb932109ceToomas Soome } while (--t != 0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome }
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Fill words. Length was >= 2*words so we know t >= 1 here. */
199767f8919635c4928607450d9e0abb932109ceToomas Soome t = length / wsize;
199767f8919635c4928607450d9e0abb932109ceToomas Soome do {
199767f8919635c4928607450d9e0abb932109ceToomas Soome *(u_int *)dst = WIDEVAL;
199767f8919635c4928607450d9e0abb932109ceToomas Soome dst += wsize;
199767f8919635c4928607450d9e0abb932109ceToomas Soome } while (--t != 0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Mop up trailing bytes, if any. */
199767f8919635c4928607450d9e0abb932109ceToomas Soome t = length & wmask;
199767f8919635c4928607450d9e0abb932109ceToomas Soome if (t != 0)
199767f8919635c4928607450d9e0abb932109ceToomas Soome do {
199767f8919635c4928607450d9e0abb932109ceToomas Soome *dst++ = VAL;
199767f8919635c4928607450d9e0abb932109ceToomas Soome } while (--t != 0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome RETURN;
199767f8919635c4928607450d9e0abb932109ceToomas Soome}