#include <stdio.h>
#include <stdlib.h>

void usage(char * s)
{
	fprintf(stderr, "Usage:\n");
	fprintf(stderr, "\t%s imgx imgy minx miny\n", s);
}

int main(int ac, char ** av)
{
	float imgratio;
	float minratio;
	unsigned int imgx, imgy, minx, miny;
	
	if (ac < 5) {
		usage(av[0]);
		return 1;
	}
	
	imgx=atoi(av[1]);
	imgy=atoi(av[2]);
	minx=atoi(av[3]);
	miny=atoi(av[4]);
	
	printf("Dimensions: %dx%d ---> %dx%d\n", imgx, imgy, minx, miny);
	if (!(imgx && imgy)) {
		fprintf(stderr, "Image dimensions must be non-zero!\n");
		return 1;
	}
	
	imgratio=(float) imgx/(float) imgy;
	minratio=(float) minx/(float) miny;
	
	printf("Ratios: Image: %.2f, Thumbnail: %.2f\n", imgratio, minratio);
	
	if (minratio > imgratio) {
		minx=miny*imgratio;
	} else {
		miny=minx/imgratio;
	}
	
	printf("Target dimensions: %dx%d\n", minx, miny);
	return 0;	
}