C语言 字符串替换

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void ReplaceStr(char *source, char *aa, char *bb)  // aa-->bb,aa被bb替换。
{
     int len=64,StringLen;
     char temp[len];
     char *FindPos = strstr(source, aa);
     if( (!FindPos) || (!aa) )
         return -1;   
     while( FindPos )
     {
         memset(temp, 0, sizeof(temp));
         StringLen = FindPos - source;
         strncpy(temp, source, StringLen);
         strcat(temp, bb);
         strcat(temp, FindPos + strlen(aa));
         strcpy(source, temp);   
        FindPos = strstr(source, aa);
     }
}
int main()
{
 int i,j;
 char a[]="abc\"de",*pa=a;//源字符串
 char b[]="ab",*pb=b;     //替换前的 字符串
 char c[]="123",*pc=c;    //替换后的 字符串 
 printf("before: pa=%s \n",pa);
 ReplaceStr(pa,pb,pc);
 printf("after:  pa=%s \n",pa);
 // printf("pb=%s \n",pb);
 // printf("pc=%s \n",pc);
 return 0;
}