USG_PG3/usr/source/sccsutil2/putchr.s

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/ C library -- putchar

/ modified by L Wehr for R haight to accomodate stringf

	.globl	_putchar,_flush
	.globl	_fout
	.globl	_stout

_putchar:
	mov	r5,-(sp)
	mov	sp,r5
	mov	_stout,r0
	beq	1f
	cmp	_stout,_stout+2
	jhis	2f
	movb	4(r5),(r0)+
	clrb	(r0)
	mov	r0,_stout
	br	2f
1:
	mov	_fout+4,r0
	bne	1f
	jsr	pc,fl
	mov	_fout+4,r0
1:
	movb	4(r5),(r0)+
	beq	1f
	inc	_fout+4
	dec	_fout+2
	bgt	1f
	jsr	pc,fl
1:
2:
	mov	4(r5),r0
	mov	(sp)+,r5
	rts	pc

_flush:
	mov	r5,-(sp)
	mov	sp,r5
	jsr	pc,fl
	mov	(sp)+,r5
	rts	pc

fl:
	mov	_fout+4,r0
	beq	1f
	sub	$_fout+6,r0
	mov	r0,0f
	mov	_fout,r0
	bne	2f
	inc	r0
2:
	sys	0; 9f
.data
9:	sys	write; _fout+6; 0:..
.text
1:
	mov	$_fout+6,_fout+4
	mov	$512.,_fout+2
	cmp	_fout,$2
	bhi	1f
	mov	$1,_fout+2
1:
	rts	pc

.bss
_fout:	.=.+518.
_stout: .=.+4	/ stout[0]: the current string pointer,
		/ stout[1]: the address of the end of the string.