#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>

#define BUFFER_SIZE 4096

int main(int argc, char *argv[]) {
    if (argc != 3) {
        fprintf(stderr, "Usage: %s <file1> <file2>\n", argv[0]);
        return 1;
    }

    const char *file1 = argv[1];
    const char *file2 = argv[2];

    struct stat stat1, stat2;

    if (stat(file1, &stat1) == -1) {
        perror("Erreur stat file1");
        return 1;
    }

    if (stat(file2, &stat2) == -1) {
        perror("Erreur stat file2");
        return 1;
    }

    if (stat1.st_size != stat2.st_size) {
        return 1; 
    }

    int fd1 = open(file1, O_RDONLY);
    if (fd1 == -1) {
        perror("Erreur open file1");
        return 1;
    }

    int fd2 = open(file2, O_RDONLY);
    if (fd2 == -1) {
        perror("Erreur open file2");
        close(fd1);
        return 1;
    }

    char buffer1[BUFFER_SIZE];
    char buffer2[BUFFER_SIZE];
    ssize_t bytes_read1, bytes_read2;

    while ((bytes_read1 = read(fd1, buffer1, BUFFER_SIZE)) > 0) {
        bytes_read2 = read(fd2, buffer2, BUFFER_SIZE);

        if (bytes_read2 != bytes_read1 || memcmp(buffer1, buffer2, bytes_read1) != 0) {
            close(fd1);
            close(fd2);
            return 1; 
        }
    }

    if (bytes_read1 == -1) {
        perror("Erreur lecture file1");
        close(fd1);
        close(fd2);
        return 1;
    }

    close(fd1);
    close(fd2);

    return 0;
}