OAIP_Mirror/progressbar test/progressbar.c

#include <stdio.h>
#include "progressbar.h"

// see progressbar.h

static const unsigned progressbar_width = 80 - 7;

static unsigned get_to_print(unsigned current, unsigned max) {
	return progressbar_width * current / max;
}

static unsigned get_percentage(unsigned current, unsigned max) {
	return 100 * current / max;
}

static void progressbar_show(struct progressbar *pb) {
	unsigned to_print = get_to_print(pb->current, pb->max);
	unsigned percentage = get_percentage(pb->current, pb->max);

	printf("\r[");
	for(unsigned i = 0; i < to_print; i++) {
			printf("#");
	}
	for(unsigned i = 0; i < progressbar_width - to_print; i++) {
			printf(" ");
	}
	printf("] %3u%%", percentage);
	fflush(stdout);
}

void progressbar_start(struct progressbar *pb, unsigned max) {
	pb->max = max;
	pb->current = 0;
	progressbar_show(pb);
}

void progressbar_set(struct progressbar *pb, unsigned current) {
	unsigned old_to_print = get_to_print(pb->current, pb->max);
	unsigned old_percentage = get_percentage(pb->current, pb->max);
	unsigned to_print = get_to_print(current, pb->max);
	unsigned percentage = get_percentage(current, pb->max);
	pb->current = current;
	if(old_to_print == to_print && old_percentage == percentage) {
			return;
	}
	progressbar_show(pb);
}

void progressbar_add(struct progressbar *pb, unsigned n) {
	progressbar_set(pb, pb->current + n);
}

void progressbar_inc(struct progressbar *pb) {
	progressbar_add(pb, 1);
}

void progressbar_clear() {
	printf("\r");
	for(unsigned i = 0; i < progressbar_width + 7; i++) {
		printf(" ");
	}
	fflush(stdout);
	printf("\r");
	fflush(stdout);
}