mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/*
|
|
* Copyright (c) 2011, 2012, 2014, 2015, 2016 Jonas 'Sortie' Termansen.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* string/memcpy.c
|
|
* Copy memory between non-overlapping regions.
|
|
*/
|
|
|
|
#include <scram.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#if defined(__is_sortix_libk)
|
|
#include <libk.h>
|
|
#endif
|
|
|
|
inline static
|
|
void* memcpy_slow(void* restrict dst_ptr,
|
|
const void* restrict src_ptr,
|
|
size_t size)
|
|
{
|
|
unsigned char* restrict dst = (unsigned char* restrict) dst_ptr;
|
|
const unsigned char* restrict src = (const unsigned char* restrict) src_ptr;
|
|
for ( size_t i = 0; i < size; i++ )
|
|
dst[i] = src[i];
|
|
return dst_ptr;
|
|
}
|
|
|
|
void* memcpy(void* restrict dst_ptr,
|
|
const void* restrict src_ptr,
|
|
size_t size)
|
|
{
|
|
if ( dst_ptr == src_ptr || !size )
|
|
return dst_ptr;
|
|
|
|
void* dst_end = (char*) dst_ptr + size;
|
|
const void* src_end = (const const char*) src_ptr + size;
|
|
if ( (dst_ptr < src_ptr && src_ptr < dst_end) ||
|
|
(src_ptr < dst_ptr && dst_ptr < src_end) )
|
|
{
|
|
#if defined(__is_sortix_libk)
|
|
libk_overlapping_memcpy();
|
|
#else
|
|
struct scram_undefined_behavior info;
|
|
info.filename = __FILE__;
|
|
info.line = __LINE__;
|
|
info.column = 0;
|
|
info.violation = "overlapping memcpy";
|
|
scram(SCRAM_UNDEFINED_BEHAVIOR, &info);
|
|
#endif
|
|
}
|
|
|
|
#if 8 < __SIZEOF_LONG__
|
|
#warning "you should add support for your unexpectedly large unsigned long."
|
|
return memcpy_slow(dst_ptr, src_ptr, size);
|
|
#else
|
|
unsigned long unalign_mask = sizeof(unsigned long) - 1;
|
|
unsigned long src_unalign = (unsigned long) src_ptr & unalign_mask;
|
|
unsigned long dst_unalign = (unsigned long) dst_ptr & unalign_mask;
|
|
if ( src_unalign != dst_unalign )
|
|
return memcpy_slow(dst_ptr, src_ptr, size);
|
|
|
|
union
|
|
{
|
|
unsigned long srcval;
|
|
const unsigned char* restrict src8;
|
|
const uint16_t* restrict src16;
|
|
const uint32_t* restrict src32;
|
|
const uint64_t* restrict src64;
|
|
const unsigned long* restrict srcul;
|
|
} su;
|
|
su.srcval = (unsigned long) src_ptr;
|
|
|
|
union
|
|
{
|
|
unsigned long dstval;
|
|
unsigned char* restrict dst8;
|
|
uint16_t* restrict dst16;
|
|
uint32_t* restrict dst32;
|
|
uint64_t* restrict dst64;
|
|
unsigned long* restrict dstul;
|
|
} du;
|
|
du.dstval = (unsigned long) dst_ptr;
|
|
|
|
if ( dst_unalign )
|
|
{
|
|
if ( 1 <= size && !(du.dstval & (1-1)) && (du.dstval & (2-1)) )
|
|
*du.dst8++ = *su.src8++,
|
|
size -= 1;
|
|
|
|
if ( 2 <= size && !(du.dstval & (2-1)) && (du.dstval & (4-1)) )
|
|
*du.dst16++ = *su.src16++,
|
|
size -= 2;
|
|
|
|
#if 8 <= __SIZEOF_LONG__
|
|
if ( 4 <= size && !(du.dstval & (4-1)) && (du.dstval & (8-1)) )
|
|
*du.dst32++ = *su.src32++,
|
|
size -= 4;
|
|
#endif
|
|
}
|
|
|
|
size_t num_copies = size / sizeof(unsigned long);
|
|
for ( size_t i = 0; i < num_copies; i++ )
|
|
*du.dstul++ = *su.srcul++;
|
|
|
|
size -= num_copies * sizeof(unsigned long);
|
|
|
|
if ( size )
|
|
{
|
|
#if 8 <= __SIZEOF_LONG__
|
|
if ( 4 <= size )
|
|
*du.dst32++ = *su.src32++,
|
|
size -= 4;
|
|
#endif
|
|
|
|
if ( 2 <= size )
|
|
*du.dst16++ = *su.src16++,
|
|
size -= 2;
|
|
|
|
if ( 1 <= size )
|
|
*du.dst8++ = *su.src8++,
|
|
size -= 1;
|
|
}
|
|
|
|
return dst_ptr;
|
|
#endif
|
|
}
|