main7.c

//
// Created by ge on 2023/12/11.
//

#include <stdio.h>
#include <stdlib.h>

typedef struct String{
    char * data;
    int len;
}String;

String * initString(){
    String * s = (String*) malloc(sizeof(String));
    s->data = NULL;
    s->len = 0;
    return s;
}

void stringAssign(String *s, char * data){
    if (s->data) {
        free(s->data);
    }

    int len = 0;
    char * temp = data;
    while (*temp){
        len++;
        temp++;
    }
    if (len == 0) {
        s->data = NULL;
        s->len = 0;
    }else {
        temp = data;
        s->len = len;
        s->data = (char *) malloc(sizeof(char) * (len + 1));
        for (int i = 0; i < len; i++,temp++) {
            s->data[i] = *temp;
        }
    }
}

void printString(String *s){

    for (int i = 0; i < s->len; i++) {
        printf(i == 0 ? "%c" : " -> %c", s->data[i]);
    }
    printf("\n");
}

void bruteMatch(String* master, String* sub){
    int i = 0;
    int j = 0;
    while (i < master->len && j < sub->len){
        if (master->data[i] == sub->data[j]){
            i++;
            j++;
        }else {
            i = i - j + 1;

            j = 0;
        }
    }

    if (j == sub->len) {
        printf("force match success.\n");
    }else {
        printf("force match fail.\n");
    }
}

int main(int argc, char *argv[]) {
    String *s = initString();
    String *s1 = initString();
    stringAssign(s, argv[1]);
    printString(s);
    stringAssign(s1, argv[2]);
    printString(s);

    bruteMatch(s,s1);


    return 0;
}