/*------------------------
* obj2bin.c
*
*    Convert LC-3 load objects (.obj files) to plain text,
* binary representation (ascii .bin files).
* USAGE:
*    obj2bin < foo.obj > foo.bin
*------------------------*/

#include <stdio.h>
#define WORDSIZE 16
#define BYTESIZE 8

int main(void) {
    int firstByte, secondByte;
    int i;
    char highOrderChars[BYTESIZE];
    char lowOrderChars[BYTESIZE];

    while (1) {

	/*-- Get next word.--*/
        firstByte = getchar(); secondByte = getchar();
        if (ferror(stdin)) {
            fprintf(stderr, "obj2bin: ERROR reading input. Giving up.\n");
            return(1);
        } else if (feof(stdin)) {
	    return(0);
	}

	/*-- Process one 16-bit word.-------------
        *-- The following is for big-Endian:
        *-- High-order byte comes first.
	*----------------------------------------*/
	/*---- Convert high-order bits to ascii, lowest-order bit first. --*/
        for (i=0; i<BYTESIZE; i++) {
	    highOrderChars[i] = ('0') + (firstByte%2);
	    firstByte = firstByte >> 1;
	}
	/*---- Convert low-order bits to ascii, lowest-order bit first. --*/
        for (i=0; i<BYTESIZE; i++) {
	    lowOrderChars[i] = ('0') + (secondByte%2);
	    secondByte = secondByte >> 1;
	}
	/*---- print high-order bits, left-to-right, highest bit first. --*/
	for (i=(BYTESIZE-1); i>=0; i--) {
	    printf("%c", highOrderChars[i]);
	}
	/*---- print low-order bits, left-to-right, highest bit first. --*/
	for (i=(BYTESIZE-1); i>=0; i--) {
	    printf("%c", lowOrderChars[i]);
	}
        printf("\n");

    } /*end while*/
}