progressbar.c

void display_progress_bar(int progress) {
    static const int PROGRESS_BAR_LENGTH = 20;
    int filled = progress * PROGRESS_BAR_LENGTH / 100;

    fprintf(stderr, "\r[");
    for (int i = 0; i < filled; i += 1) {
        fprintf(stderr, "#");
    }
    for (int i = filled; i < PROGRESS_BAR_LENGTH; i += 1) {
        fprintf(stderr, " ");
    }
    fprintf(stderr, "] %3d% %", progress);
    if (filled == PROGRESS_BAR_LENGTH) {
        fprintf(stderr, "\n");
    }
}