Ultrix-3.1/src/libc/sys/read.s

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/ SCCSID: @(#)read.s	3.0	4/22/86
/
//////////////////////////////////////////////////////////////////////
/   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    /
/   All Rights Reserved. 					     /
/   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      /
//////////////////////////////////////////////////////////////////////
/
/ Based on: @(#)read.s	2.2	Berkeley
/ C library -- read

/ nread = read(file, buffer, count);
/ nread ==0 means eof; nread == -1 means error

.globl	_read
.globl	cerror
.read = 3.

_read:
	mov	r5,-(sp)
	mov	sp,r5
	mov	4(r5),r0
	mov	8(r5),-(sp)
	mov	6(r5),-(sp)
	sys	.read+200
	bec	1f
	cmp	(sp)+, (sp)+
	jmp	cerror
1:
	cmp	(sp)+, (sp)+
	mov	(sp)+,r5
	rts	pc