fef
0f9e9f91a6
Oh my fucking god this was by far the most awful and boring and tedious day in my entire life. Also, dear FreeBSD people: please don't sue me. I tried really hard to comply with all the copyright stuff, but it is absolutely possible i made a mistake. Just DM me and i'll do everything in my power to fix it, even if that means releasing entire portions of GayBSD under the BSD license. I don't care, i just want stuff to work. (i'm including this message to use it as possible evidence in case i get sued to show my good will)
144 lines
4.2 KiB
C
144 lines
4.2 KiB
C
/* See the end of this file for copyright and license terms. */
|
|
|
|
#include <gay/types.h>
|
|
|
|
#include <limits.h>
|
|
|
|
#define wsize sizeof(unsigned long)
|
|
#define wmask (wsize - 1)
|
|
|
|
#ifdef BZERO
|
|
#include <strings.h>
|
|
|
|
#define RETURN return
|
|
#define VAL 0
|
|
#define WIDEVAL 0
|
|
|
|
void bzero(void *dst0, usize length)
|
|
#else
|
|
#include <string.h>
|
|
|
|
#define RETURN return (dst0)
|
|
#define VAL c0
|
|
#define WIDEVAL c
|
|
|
|
void *memset(void *dst0, int c0, usize length)
|
|
#endif
|
|
{
|
|
usize t;
|
|
#ifndef BZERO
|
|
unsigned long c;
|
|
#endif
|
|
unsigned char *dst;
|
|
|
|
dst = dst0;
|
|
/*
|
|
* If not enough words, just fill bytes. A length >= 2 words
|
|
* guarantees that at least one of them is `complete' after
|
|
* any necessary alignment. For instance:
|
|
*
|
|
* |-----------|-----------|-----------|
|
|
* |00|01|02|03|04|05|06|07|08|09|0A|00|
|
|
* ^---------------------^
|
|
* dst dst+length-1
|
|
*
|
|
* but we use a minimum of 3 here since the overhead of the code
|
|
* to do word writes is substantial.
|
|
*
|
|
* TODO: This threshold might not be sensible for 64-bit u_long.
|
|
* We should benchmark and revisit this decision.
|
|
*/
|
|
if (length < 3 * wsize) {
|
|
while (length != 0) {
|
|
*dst++ = VAL;
|
|
--length;
|
|
}
|
|
RETURN;
|
|
}
|
|
|
|
#ifndef BZERO
|
|
if ((c = (unsigned char)c0) != 0) { /* Fill the word. */
|
|
c = (c << 8) | c; /* u_long is 16 bits. */
|
|
#if ULONG_MAX > 0xffff
|
|
c = (c << 16) | c; /* u_long is 32 bits. */
|
|
#endif
|
|
#if ULONG_MAX > 0xffffffff
|
|
c = (c << 32) | c; /* u_long is 64 bits. */
|
|
#endif
|
|
}
|
|
#endif
|
|
/* Align destination by filling in bytes. */
|
|
if ((t = (long)dst & wmask) != 0) {
|
|
t = wsize - t;
|
|
length -= t;
|
|
do {
|
|
*dst++ = VAL;
|
|
} while (--t != 0);
|
|
}
|
|
|
|
/* Fill words. Length was >= 2*words so we know t >= 1 here. */
|
|
t = length / wsize;
|
|
do {
|
|
*(unsigned long *)(void *)dst = WIDEVAL;
|
|
dst += wsize;
|
|
} while (--t != 0);
|
|
|
|
/* Mop up trailing bytes, if any. */
|
|
t = length & wmask;
|
|
if (t != 0) {
|
|
do {
|
|
*dst++ = VAL;
|
|
} while (--t != 0);
|
|
}
|
|
RETURN;
|
|
}
|
|
|
|
/*
|
|
* This file is part of GayBSD.
|
|
* Copyright (c) 2021 fef <owo@fef.moe>.
|
|
*
|
|
* GayBSD is nonviolent software: you may only use, redistribute, and/or
|
|
* modify it under the terms of the Cooperative Nonviolent Public License
|
|
* (CNPL) as found in the LICENSE file in the source code root directory
|
|
* or at <https://git.pixie.town/thufie/npl-builder>; either version 7
|
|
* of the license, or (at your option) any later version.
|
|
*
|
|
* GayBSD comes with ABSOLUTELY NO WARRANTY, to the extent
|
|
* permitted by applicable law. See the CNPL for details.
|
|
*
|
|
* ==========================================================================
|
|
*
|
|
* This file is derived from FreeBSD source code.
|
|
*
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Mike Hibler and Chris Torek.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|