scrolling.c

#include "functions.h"

int main(int argc, char* argv[])
{
    // Optional argv[1]: String to display
    const char* str = "Bonjour je m'appelle Benjamin";
    if (argc >= 2)
        str = argv[1];

    // Optional argv[2]: delay between ticks in (ms)
    int delay = 500;
    if (argc >= 3)
        delay = string_to_number(argv[2]);

    int str_length = string_length(str);
    int tick = 0;
    while (true) // Infinite loop (Ctrl-C to stop)
    {
        // First chararacter to display is at str[scroll_index]
        // It will loop from 0 to str_length-1
        unsigned int scroll_index = tick % str_length;

        put_string(&str[scroll_index]);  // Display the end of string (from str[index] to '\0' char)
        put_string_n(str, scroll_index); // Display the start of string (from str[0] to str[scroll_index-1])
        put_char('\r');                  // Carriage return
        update_output();

        sleep_ms(delay);
        tick++;                          // Update tick for next loop
    }

    return 0;
}