/* HEX.C translates the standard input into hexadecimal notation and sends
 * the result to standard output.
 * Usage: hex < foo.exe > foo.hex
 * Christine M. Gianone, CUCCA, October 1986
 * Modified Feb 89 to work right with Microsoft C on the PC.
 */

#include <stdio.h>			/* For EOF symbol */
#ifdef MSDOS
#include <fcntl.h>			/* For MS-DOS O_BINARY symbol */
#endif

char h[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
unsigned int c;
int ctr = 0;
char a, b;

main() {
#ifdef MSDOS
    setmode(fileno(stdin),O_BINARY);  /* To avoid DOS text-mode conversions */
#endif
    while ((c = getchar()) != EOF) {
	b = c & 0xF;			/* Get low 4 bits */
	a = c / 16;			/* and high 4 bits */
	putchar(h[a]);			/* Hexify and output them */
        putchar(h[b]);
	ctr += 2;			/* Break lines every 72 characters */
	if (ctr == 72) {
	    putchar('\n');
	    ctr = 0;
        }
    }
    putchar('\n');			/* Terminate final line */
}