#include <stdint.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <fcntl.h>

int main(int argc, char** argv) {
        const char* fn = argv[1];
        const char* pattern = argv[2];
        int fd = open(fn, O_RDONLY | O_CREAT);
        //FILE* file = fdopen(fd, "r");
        //lseek(fd, 0, SEEK_END);
        long size = lseek(fd, 0, SEEK_END) + 1;
        char* text = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
        char* cur_found_substring = strstr(text, pattern);
        if ((int64_t)text == -1) {
                return 1;
        }
        while (cur_found_substring != NULL && (uint64_t)(cur_found_substring - text + 1) < size && cur_found_substring + 1 < text + size) {
                printf("%llu\n", (uint64_t)(cur_found_substring - text));
                cur_found_substring = strstr(cur_found_substring + 1, pattern);
        }
        munmap(text, size);
        close(fd);
        return 0;
}