console progress bar

console-progress.c

#include <stdio.h>
#include <cstdlib>

#define PROGRESS_BAR_STR "================================="
#define PROGRESS_BAR_WIDTH sizeof(PROGRESS_BAR_STR)

void print_progress_bar(size_t completed, size_t total) {
    const char operation[] = "Downloaded";
    const char prefix[] = " kMGT";
    int lpad = (int) (((double) completed / total) * PROGRESS_BAR_WIDTH);
    int rpad = PROGRESS_BAR_WIDTH - lpad;
    double percentage = (completed * 100.0) / total;
    int c = 0, t = 0;
    double dc = completed;
    double dt = total;

    while (dc >= 1024) {
        dc /= 1024;
        c++;
    }

    while (dt >= 1024) {
        dt /= 1024;
        t++;
    }
    
    printf(" \r %3.0f%% %s [%.*s%*s] %5.2f%cB / %.2f%cB ", percentage, operation, lpad, PROGRESS_BAR_STR, rpad, "", dc, prefix[c], dt, prefix[t]);

    fflush(stdout);
}