替换字符串一次(循环多次）

#include <stdio.h>
#include <time.h>
#include <malloc.h>
#include <string.h>
int StrReplace(char * srcstr, const char * oldstr, const char * newstr)
{
	char	*tmpbuffer;
	int		prelen, postlen, totallen, newlen, oldlen;
	char    *ptr;
	char	*tmpchar;

	tmpchar = strstr(srcstr, oldstr);
	if (tmpchar == NULL)	return 0;

	totallen = (int)strlen(srcstr);
	oldlen = (int)strlen(oldstr);
	newlen = (int)strlen(newstr);

	prelen = (int)(tmpchar - srcstr);
	postlen = totallen - prelen - oldlen;
	tmpchar += oldlen;

	tmpbuffer = (char*)malloc(prelen + newlen + postlen + 1);
	if (tmpbuffer == NULL)	return -1;

	ptr = tmpbuffer;
	memcpy(ptr, srcstr, prelen);
	ptr += prelen;
	memcpy(ptr, newstr, newlen);
	ptr += newlen;
	memcpy(ptr, tmpchar, postlen);

	tmpbuffer[prelen + newlen + postlen] = 0;
	strcpy(srcstr, tmpbuffer);
	srcstr[prelen + newlen + postlen] = 0;
	free((void*)tmpbuffer);
	return 1;
}
#include <iostream>
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
	char mystr[80] = "i am love you good you";
	while(StrReplace(mystr, "you", "me"));
	cout << mystr << endl;
	system("PAUSE");
	return 0;
}