fef
5a5135f416
As of now, everything except the code imported from FreeBSD is proprietary. Of course, it won't be like this for long, only until we have decided which license we like to use. The rationale is that releasing everything under a copyleft license later is always easier than doing so immediately and then changing it afterwards. Naturally, any changes made before this commit are still subject to the terms of the CNPL.
121 lines
3.8 KiB
C
121 lines
3.8 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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* Copyright (c) 2021 fef <owo@fef.moe>
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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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