qments/examples/print_info.c

/* Simple utility to get human-readable comment data */

#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "comment.h"
#include "driver.h"
#include "drivers/unix_fs/unix_fs_driver.h"

#define BUF_SZ 4096

void
usage()
{
    fprintf(stderr, "Simple utility to get comment info\n");
    fprintf(stderr, "usage: <tool-name> [-p path] id\n");
    fprintf(stderr, "-p path: path to comment storage \n");
    fprintf(stderr, "id     : id of comment \n");
}

int
main(int argc, char *argv[])
{
    const Driver *driver = &unix_fs_driver;
    char *path = ".";

    int id, opt;

    while ((opt = getopt(argc, argv, "p:")) != -1) {
        switch (opt) {
            case 'p':
                path = optarg;
                break;
            default:
                usage();
                exit(EXIT_FAILURE);
        }
    }

    if (optind >= argc) {
        usage();
        exit(EXIT_FAILURE);
    }

    id = atoi(argv[optind]);

    if (id <= 0) {
        usage();
        exit(EXIT_FAILURE);
    }

    UnixFsDriverData driver_data = { path };

    int max_id = unix_fs_driver_get_max_id(&driver_data);
    if (max_id <= 0) {
        fprintf(stderr, "Warning: failed to get id of last comment\n");
    } else if (id >= max_id) {
        fprintf(stderr, "Last comment has id %d, which is less than %d\n", max_id - 1, id);
        exit(EXIT_FAILURE);
    }

    CommentHeader *header = malloc(sizeof(CommentHeader));
    header->user_sid = malloc(BUF_SZ);
    header->user_displayname = malloc(BUF_SZ);

    if (driver->get_header(&driver_data, header, id) < 0) {
        fprintf(stderr, "failed to get header of comment, are you sure it exists?\n");
        exit(EXIT_FAILURE);
    }

    printf("Got a valid comment header\n");
    printf("%-30s: %d\n", "Reply id", header->reply_id);
    struct tm tm = *localtime(&header->creation_time);
    printf("%-30s: %d-%02d-%02d %02d:%02d:%02d\n", "Creation time", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
    printf("%-30s: %lu\n", "Text size in bytes", header->text_length);
    printf("%-30s: %s\n", "User string ID", header->user_sid);
    printf("%-30s: %s\n", "User displayname", header->user_displayname);

    char *text_buffer = malloc(header->text_length + 1);
    if (driver->get_text(&driver_data, text_buffer, id) < 0) {
        fprintf(stderr, "failed to get text of comment\n");
        exit(EXIT_FAILURE);
    }

    printf("Comment text:\n");
    printf(text_buffer);
}