fef
904584ccc0
This is just a minor overhaul of several utility functions, in part because it kept bothering me and in part because i was bored.
136 lines
4.4 KiB
C
136 lines
4.4 KiB
C
/* See the end of this file for copyright and license terms. */
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#include <gay/types.h>
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#include <string.h>
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/*
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* The two and four byte routines use the same trick as strlen(),
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* see the respective file for details and where it's from.
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*/
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static inline void fourbyte_strcpy(char *to, const char *from)
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{
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/* make sure we are aligned first */
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#pragma unroll(3)
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while ((uintptr_t)to % 4) {
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if ((*to++ = *from++) == '\0')
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return;
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}
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/* copy in chunks of 4 bytes until there is a terminator */
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u32 *to32 = (u32 *)to;
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const u32 *from32 = (const u32 *)from;
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while ( ((*from32 - 0x01010101) & (~*from32 & 0x80808080)) == 0 )
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*to32++ = *from32++;
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to = (char *)to32;
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from = (const char *)from32;
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/* copy the remaining bytes (can only be within 1 and 4) */
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#pragma unroll(4)
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while ((*to++ = *from++) != '\0');
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/* nothing */
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}
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static inline void twobyte_strcpy(char *to, const char *from)
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{
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if ((uintptr_t)to % 2) {
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if ((*to++ = *from++) == '\0')
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return;
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}
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u16 *to16 = (u16 *)to;
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const u16 *from16 = (const u16 *)from;
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while ( ((*from16 - 0x0101) & (~*from16 & 0x8080)) == 0 )
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*to16++ = *from16++;
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to = (char *)to16;
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from = (const char *)from16;
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/* copy the remaining bytes (can only be within 1 and 2) */
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#pragma unroll(2)
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while ((*to++ = *from++) != '\0');
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/* nothing */
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}
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#ifdef WEAK_STRCPY
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#define STRCPY_NAME __strcpy
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#else
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#define STRCPY_NAME strcpy
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#endif
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char *STRCPY_NAME(char *restrict to, const char *restrict from)
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{
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char *save = to;
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/*
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* Check if the pointers can both be aligned to 2 or 4 bytes and copy
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* in whole blocks of 2 or 4 bytes respectively if that's the case.
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* This optimization is utterly useless because i'm almost certainly
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* gonna write (or "import", rather) dedicated assembly routines but
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* hey it can't hurt to introduce new sources for bugs right?
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*/
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if (((uintptr_t)to % 4) == ((uintptr_t)from % 4)) {
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fourbyte_strcpy(to, from);
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} else if (((uintptr_t)to % 2) == ((uintptr_t)from % 2)) {
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twobyte_strcpy(to, from);
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} else {
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while ((*to++ = *from++) != '\0');
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/* nothing */
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}
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return save;
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}
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#ifdef WEAK_STRCPY
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#include <gay/cdefs.h>
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__weak __alias(__strcpy) char *strcpy(char *restrict, const char *restrict);
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#endif /* WEAK_STRCPY */
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/*
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* This file is part of GayBSD.
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* Copyright (c) 2021 fef <owo@fef.moe>.
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*
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* GayBSD is nonviolent software: you may only use, redistribute, and/or
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* modify it under the terms of the Cooperative Nonviolent Public License
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* (CNPL) as found in the LICENSE file in the source code root directory
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* or at <https://git.pixie.town/thufie/npl-builder>; either version 7
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* of the license, or (at your option) any later version.
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*
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* GayBSD comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPL for details.
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*
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* ==========================================================================
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*
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* This file is derived from FreeBSD source code.
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*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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