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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
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#include <libc/sys/types.h>
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void *memset(void *dst, unsigned char C, uint64_t size);
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/**
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* @brief 获取字符串的大小
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*
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* @param s 字符串
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* @return size_t 大小
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*/
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size_t strlen(const char *s);
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/*
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比较字符串 FirstPart and SecondPart
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FirstPart = SecondPart => 0
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FirstPart > SecondPart => 1
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FirstPart < SecondPart => -1
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*/
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int strcmp(const char *FirstPart, const char *SecondPart);
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/**
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* @brief 拷贝指定字节数的字符串
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*
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* @param dst 目标地址
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* @param src 源字符串
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* @param Count 字节数
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* @return char*
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*/
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char *strncpy(char *dst, const char *src, size_t Count);
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/**
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* @brief 拷贝整个字符串
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*
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* @param dst 目标地址
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* @param src 源地址
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* @return char* 目标字符串
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*/
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char* strcpy(char* dst, const char* src);
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/**
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* @brief 拼接两个字符串（将src接到dest末尾）
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*
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* @param dest 目标串
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* @param src 源串
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* @return char*
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*/
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char *strcat(char *dest, const char *src);
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/**
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* @brief 内存拷贝函数
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*
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* @param dst 目标数组
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* @param src 源数组
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* @param Num 字节数
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* @return void*
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*/
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static void *memcpy(void *dst, const void *src, long Num)
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{
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int d0 = 0, d1 = 0, d2 = 0;
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__asm__ __volatile__("cld \n\t"
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"rep \n\t"
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"movsq \n\t"
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"testb $4,%b4 \n\t"
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"je 1f \n\t"
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"movsl \n\t"
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"1:\ttestb $2,%b4 \n\t"
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"je 2f \n\t"
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"movsw \n\t"
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"2:\ttestb $1,%b4 \n\t"
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"je 3f \n\t"
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"movsb \n\t"
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"3: \n\t"
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: "=&c"(d0), "=&D"(d1), "=&S"(d2)
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: "0"(Num / 8), "q"(Num), "1"(dst), "2"(src)
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: "memory");
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return dst;
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} |