/* convert a binary number to string
 * using any base from 2 to 10
 * and print it
 * code by Pekka "PQ" Paalanen
 *
 * compile with
 * as -o rint.o rint2.s
 * ld -m elf_i386 -s rint.o -o rint
 */

.text
.globl _start	/* version 0.3.1 */
_start:	leal	-1(%esp), %ecx	/* initialize str ptr */
	movb	$10, (%ecx)	/* put '\n' */
	movl	$-1, %eax	/* value to be printed */
	movl	$5, %ebx	/* divisor (number base) */

decode:	xorl	%edx, %edx	/* sign extension; unsigned */
	idivl	%ebx		/* divide by number base */
	addl	$48, %edx	/* make character from remainder */
	decl	%ecx		/* move str ptr */
	movb	%dl, (%ecx)	/* put character */
	cmp	$0, %eax
	jnz	decode		/* if %eax != 0 goto decode */

	movl	%esp, %edx
	subl	%ecx, %edx	/* string length */
	movl	$1, %ebx	/* file handle */
	movl	$4, %eax	/* syscall number (sys_write) */
	int	$0x80		/* call kernel */

	xorl	%ebx, %ebx	/* return value */
	movl	$1, %eax	/* syscall number (sys_exit) */
	int	$0x80		/* call kernel */