在字符串S1中删除字符串S2中所包含的字符【转】

/*************************************************************************
    > File Name: test.c
    > Author: ToLiMit
    > Mail: 348958453@qq.com 
    > Created Time: Sun 04 Jan 2015 06:20:05 PM PST
 ************************************************************************/

#include<stdio.h>

void delete_str_char (char * main_str, char * sub_str)
{
    if ((main_str == NULL) || (sub_str == NULL))
        return;

    char * sub_index = sub_str;
    char * main_index = main_str;
    char bitmap[32] = {0};
    char * str = (char *)malloc (strlen (str) + 1);
    char * index = str;
    memset (str, 0, strlen (str) + 1);

    while (*sub_index != '