Print "moving" objects (advancing timeline, rotating star, etc...)

print_in_place.c

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/select.h>
#include <stdarg.h>

#define CURSOR_DISSABLE "\E[?25l"
#define CURSOR_ENABLE "\E[?25h"

#define ARRAY_SZ(ARR) (sizeof(ARR) / sizeof(ARR[0]))

static void print(char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    vfprintf(stdout, fmt, ap);
    va_end(ap);
    fflush(stdout);
}

void print_sand_clock(int len)
{
    int i;
    char fmt[16];

    sprintf(fmt, "[%%%ds]\r[", len);
    print(fmt, "");
    for (i = 0; i < len; i++)
    {
	print(".");
	usleep(250000);
    }
    print("\n");
}

void print_star(int time)
{
    char *star[4] = {"-", "\\", "|", "/"};
    char fmt[16];
    int i;

    sprintf(fmt, "%%s\r");
    for (i = 0; i < time; i++)
    {
	print(fmt, star[i%ARRAY_SZ(star)]);
	usleep(100000);
    }
    sprintf(fmt, "%%s\r");
    print(fmt, "");
}

void print_movment_single_line(int len)
{
    int i;
    char fmt[50];

    for (i = 0; i < len; i++)
    {
	sprintf(fmt, "[%%%ds.%%%ds]\r", i, len - 1 - i);
	print(fmt, "", "");
	usleep(250000);
    }
    sprintf(fmt, "[%%%ds]\r\n", len);
    print(fmt, "");
}

void print_movment_multi_line(int len)
{
#define UP_ONE "\033[2A"
    int i;
    char fmt[50];

    print("\n\n");
    for (i = 0; i < len; i++)
    {
	sprintf(fmt, "%s\r[%%%ds.%%%ds]\n[%%%ds.%%%ds]\n", UP_ONE, i, 
	    len - 1 - i, len - 1 - i, i);
	print(fmt, "", "", "", "");

	usleep(250000);
    }
    sprintf(fmt, "%s\r[%%%ds]\n[%%%ds]\n", UP_ONE, len, len);
    print(fmt, "", "");
}

int main(int argc, char *argv[])
{
    printf(CURSOR_DISSABLE);
    print_sand_clock(10);
    print_movment_single_line(10);
    print_movment_multi_line(10);
    print_star(20);
    printf(CURSOR_ENABLE);
    return 0;
}