memset.c revision 199767f8919635c4928607450d9e0abb932109ce
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Copyright (c) 1990, 1993
199767f8919635c4928607450d9e0abb932109ceToomas Soome * The Regents of the University of California. All rights reserved.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * This code is derived from software contributed to Berkeley by
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Mike Hibler and Chris Torek.
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 * 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 * 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 Soomestatic char sccsid[] = "@(#)memset.c 8.1 (Berkeley) 6/4/93";
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif /* LIBC_SCCS and not lint */
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define RETURN return
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 * |00|01|02|03|04|05|06|07|08|09|0A|00|
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ^---------------------^
199767f8919635c4928607450d9e0abb932109ceToomas Soome * dst dst+length-1
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 while (length != 0) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome if ((c = (u_char)c0) != 0) { /* Fill the word. */
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Align destination by filling in bytes. */
199767f8919635c4928607450d9e0abb932109ceToomas Soome } while (--t != 0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Fill words. Length was >= 2*words so we know t >= 1 here. */
199767f8919635c4928607450d9e0abb932109ceToomas Soome } while (--t != 0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Mop up trailing bytes, if any. */
199767f8919635c4928607450d9e0abb932109ceToomas Soome } while (--t != 0);