mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-13 11:06:46 +00:00
e62bbf13e5
* swab函数 Signed-off-by: Yuqia <15287042733@163.com> * 修正格式 Signed-off-by: Yuqia <15287042733@163.com> Co-authored-by: fslongjin <longjin@RinGoTek.cn>
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
#pragma once
|
||
|
||
#include <libc/sys/types.h>
|
||
|
||
void *memset(void *dst, unsigned char C, uint64_t size);
|
||
/**
|
||
* @brief 获取字符串的大小
|
||
*
|
||
* @param s 字符串
|
||
* @return size_t 大小
|
||
*/
|
||
size_t strlen(const char *s);
|
||
|
||
/*
|
||
比较字符串 FirstPart and SecondPart
|
||
FirstPart = SecondPart => 0
|
||
FirstPart > SecondPart => 1
|
||
FirstPart < SecondPart => -1
|
||
*/
|
||
|
||
int strcmp(const char *FirstPart, const char *SecondPart);
|
||
|
||
/**
|
||
* @brief 拷贝指定字节数的字符串
|
||
*
|
||
* @param dst 目标地址
|
||
* @param src 源字符串
|
||
* @param Count 字节数
|
||
* @return char*
|
||
*/
|
||
char *strncpy(char *dst, const char *src, size_t Count);
|
||
|
||
/**
|
||
* @brief 拷贝整个字符串
|
||
*
|
||
* @param dst 目标地址
|
||
* @param src 源地址
|
||
* @return char* 目标字符串
|
||
*/
|
||
char* strcpy(char* dst, const char* src);
|
||
|
||
/**
|
||
* @brief 拼接两个字符串（将src接到dest末尾）
|
||
*
|
||
* @param dest 目标串
|
||
* @param src 源串
|
||
* @return char*
|
||
*/
|
||
char *strcat(char *dest, const char *src);
|
||
|
||
/**
|
||
* @brief 内存拷贝函数
|
||
*
|
||
* @param dst 目标数组
|
||
* @param src 源数组
|
||
* @param Num 字节数
|
||
* @return void*
|
||
*/
|
||
static void *memcpy(void *dst, const void *src, long Num)
|
||
{
|
||
int d0 = 0, d1 = 0, d2 = 0;
|
||
__asm__ __volatile__("cld \n\t"
|
||
"rep \n\t"
|
||
"movsq \n\t"
|
||
"testb $4,%b4 \n\t"
|
||
"je 1f \n\t"
|
||
"movsl \n\t"
|
||
"1:\ttestb $2,%b4 \n\t"
|
||
"je 2f \n\t"
|
||
"movsw \n\t"
|
||
"2:\ttestb $1,%b4 \n\t"
|
||
"je 3f \n\t"
|
||
"movsb \n\t"
|
||
"3: \n\t"
|
||
: "=&c"(d0), "=&D"(d1), "=&S"(d2)
|
||
: "0"(Num / 8), "q"(Num), "1"(dst), "2"(src)
|
||
: "memory");
|
||
return dst;
|
||
} |