mirror of
https://github.com/espressif/esp-idf.git
synced 2026-01-22 17:02:16 +00:00
ec68cb3300
This option replaces implementations of functions from ROM: - memcpy - memcmp - memmove - str[n]cpy - str[n]cmp The functions used in the firmware will be better optimized for misaligned memory. Here are some measurements in CPU cycles for 4096-byte buffers: memcpy: 28676 -> 4128 memcmp: 49147 -> 14259 memmove: 33896 -> 8086 strcpy: 32771 -> 17313 strcmp: 32775 -> 13191
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/*
|
|
* SPDX-FileCopyrightText: 1994-2009 Red Hat, Inc.
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD AND Apache-2.0
|
|
*
|
|
* SPDX-FileContributor: 2025 Espressif Systems (Shanghai) CO LTD
|
|
*/
|
|
#include <string.h>
|
|
#include <limits.h>
|
|
#include "local.h"
|
|
|
|
__attribute__((optimize("-Os")))
|
|
char *
|
|
strncpy(char *__restrict dst0,
|
|
const char *__restrict src0,
|
|
size_t count)
|
|
{
|
|
char *dst = dst0;
|
|
const char *src = src0;
|
|
long *aligned_dst;
|
|
const long *aligned_src;
|
|
|
|
/* If SRC and DEST is aligned and count large enough, then copy words. */
|
|
if (!UNALIGNED_X_Y(src, dst) && !TOO_SMALL_LITTLE_BLOCK(count)) {
|
|
aligned_dst = (long*)dst;
|
|
aligned_src = (long*)src;
|
|
|
|
/* SRC and DEST are both "long int" aligned, try to do "long int"
|
|
sized copies. */
|
|
while (!TOO_SMALL_LITTLE_BLOCK(count) && !DETECT_NULL(*aligned_src)) {
|
|
count -= sizeof(long int);
|
|
*aligned_dst++ = *aligned_src++;
|
|
}
|
|
|
|
dst = (char*)aligned_dst;
|
|
src = (char*)aligned_src;
|
|
}
|
|
|
|
while (count > 0) {
|
|
--count;
|
|
if ((*dst++ = *src++) == '\0') {
|
|
break;
|
|
}
|
|
}
|
|
|
|
while (count-- > 0) {
|
|
*dst++ = '\0';
|
|
}
|
|
|
|
return dst0;
|
|
}
|
|
|
|
// Hook to force the linker to include this file
|
|
void esp_libc_include_strncpy_impl(void)
|
|
{
|
|
}
|