#if 0
	By Cool_Breeze
	Dev-C++ 5.11
	.c
	#endif
#include <stdio.h>
#include <string.h>

void insert_str(char* str,char* flag,size_t sl,size_t fn);
void fold(char* str,size_t rl,char* flag,size_t sl,size_t fl);

//字符串大小 
#define Max 1024

int main(int argc,char **argv)
{
	static char src[Max];
	static char sub[Max];
	static char res[Max];
	
	if (argc != 4)
	{
		printf("%d",argc);
		return 0;
	}
	strcpy(src, argv[1]);
	strcpy(sub, argv[2]);
	strcpy(res, argv[3]);
	
	register size_t srclen=strlen(src);
	register size_t sublen=strlen(sub);
	register size_t reslen=strlen(res);
	
	if (!srclen || !sublen || !reslen)
	{
		printf("%s", src);
		return 0;
	}
	char *p = src;
	while (*p)
	{
		if ((p=strstr(p,sub)) == NULL) break;
		else fold(p,srclen,res,sublen,reslen);
	}

	printf("%s",src);

    return 0;
}

/*
	在字符串开始插入指定字符串
	str  原字符串的起点 
	flag 指定字符串
	sl   原字符串长度
	fl   指定字符串长度 
*/ 
void insert_str(char* str,char* flag,size_t sl,size_t fl)
{
	memmove(str+fl,str,sl+1);//+1存放结束符'\0' 
	memmove(str,flag,fl);
}
/* 
	被替换字符串长度大于替换字符字符串长度 
	explanation:
	str=abcd,flag=abc
	
	str  原字符串的起点
	flag 替换的字符串 
	sl   被替换字符长度
	fl   替换字符串长度 
*/ 
void fold(char* str,size_t rl,char* flag,size_t sl,size_t fl)
{
	memmove(str,str+sl,rl-sl+1);
	insert_str(str,flag,rl,fl);
}
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@echo off
set "s=三四ABCDE三四FG一二三四"
字符串查找及替换.exe "%s%" "三四" "bathome"
pause >nul

bathomeABCDEbathomeFG一二bathome
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