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/*************************************************************************    > File Name: test.c    > Author: ToLiMit    > Mail: 348958453@qq.com     > Created Time: Sun 04 Jan 2015 06:20:05 PM PST ************************************************************************/#include
     
      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 != '\0') {        char suffix = ((*sub_index) / 8) - 1;        char offset = (*sub_index) % 8;        bitmap[suffix] |= (0x1 << (8 - offset));        sub_index++;    }    while (*main_index != '\0') {        char suffix = ((*main_index) / 8) - 1;        char offset = (*main_index) % 8;        if ((bitmap[suffix] & (0x1 << (8 - offset))) == 0) {            *index = *main_index;            index++;        }        main_index++;    }    *index = '\0';    memcpy (main_str, str, strlen (str) + 1);    free (str);    return;}int main (int argc, char * argv[]){    char test[] = "aabcdaaaaabcaacb";    delete_str_char (test, "bcd");    printf ("%s\n", test);    return 0;}