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)
75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
/* See the end of this file for copyright and license terms. */
|
|
|
|
#include <gay/types.h>
|
|
|
|
#include <limits.h>
|
|
#include <string.h>
|
|
|
|
#define SS (sizeof(size_t))
|
|
#define ALIGN (sizeof(size_t) - 1)
|
|
#define ONES ((size_t)-1 / UCHAR_MAX)
|
|
#define HIGHS (ONES * (UCHAR_MAX / 2 + 1))
|
|
#define HASZERO(x) (((x)-ONES) & ~(x)&HIGHS)
|
|
|
|
void *memchr(const void *src, int c, usize n)
|
|
{
|
|
const unsigned char *s = src;
|
|
c = (unsigned char)c;
|
|
#ifdef __GNUC__
|
|
for (; ((uintptr_t)s & ALIGN) && n && *s != c; s++, n--)
|
|
;
|
|
if (n && *s != c) {
|
|
typedef usize __attribute__((__may_alias__)) word;
|
|
const word *w;
|
|
usize k = ONES * c;
|
|
for (w = (const void *)s; n >= SS && !HASZERO(*w ^ k);
|
|
w++, n -= SS)
|
|
;
|
|
s = (const void *)w;
|
|
}
|
|
#endif
|
|
for (; n && *s != c; s++, n--)
|
|
;
|
|
return n ? (void *)s : 0;
|
|
}
|
|
|
|
/*
|
|
* 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) 2005-2014 Rich Felker, et al.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|