/ SCCSID: @(#)dup.s	3.0	4/22/86
/
//////////////////////////////////////////////////////////////////////
/   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    /
/   All Rights Reserved. 					     /
/   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      /
//////////////////////////////////////////////////////////////////////
/
/ C library -- dup

/	f = dup(of [ ,nf])
/	f == -1 for error

.globl	_dup,_dup2
.globl	cerror
.dup = 41.

_dup2:
	mov	r5,-(sp)
	mov	sp,r5
	mov	4(r5),r0
	bis	$100,r0
	br	1f

_dup:
	mov	r5,-(sp)
	mov	sp,r5
	mov	4(r5),r0
1:
	mov	6(r5),r1
	sys	.dup
	bec	1f
	jmp	cerror
1:
	mov	(sp)+,r5
	rts	pc
