read_file.c

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

int main(int argc, char *argv[]) {
    if (argc != 3) {
        fprintf(stderr, "Usage :\n");
        fprintf(stderr, "\t./%s <image file> <inode n°>\n", basename(argv[0]));
        exit(EXIT_FAILURE);
    }

    struct minix_inode inode = {0};
    int inode_nb = atoi(argv[2]);

    unmarshal_inode(&inode, inode_nb, argv[1]);

    int nb_blocks_used = inode.i_size / BLOCK_SIZE;
    if (inode.i_size % BLOCK_SIZE != 0) {
        nb_blocks_used++;
    }

    for (int i = 0; i < nb_blocks_used; i++) {
        ssize_t phys_num = bmap(&inode, argv[1], i);

        if (phys_num == -1) {
            fprintf(stderr, "bmap has failed...\n");
            exit(EXIT_FAILURE);
        }

        char buf[BLOCK_SIZE + 1] = {0};

        if (read_data_block(buf, argv[1], phys_num) == -1) {
            fprintf(stderr, "read_data_block has failed...\n");
            exit(EXIT_FAILURE);
        }

        fprintf(stdout, "%s", buf);
    }

    fprintf(stdout, "\n");

    return EXIT_SUCCESS;
}