Category : C++ Source Code
Archive   : VCCRT2.ZIP
Filename : FILE.ASM

page ,132
title file - stream i/o tables
;***
;file.asm - stream i/o tables
;
; Copyright (c) 1990-1992, Microsoft Corporation. All rights reserved.
;
;Purpose:
; Stream I/O data tables.
;
; The _iob[] and _iob2[] tables are each in their own segments
; so that additions can appended on easily and predictably (e.g.,
; windows). Also, note that _lastiob is also defined in its own
; segment so it always points to the last _iob[] entry regardless
; of what is added to the table.
;
;*******************************************************************************

?DF = 1 ; define segments

include version.inc
.xlist
include cmacros.inc
include defsegs.inc
include stdio.inc
.list

;
; Segment declarations

CrtDefSegs
CrtDefSegs

dataOFFSET equ offset DGROUP:

;
; Number of files
;

_NFILE_ equ 20


ifdef _QWIN
;
; Pull in the windows iob/iob2 entries
; (may be overridden by noqwin.obj).
;
extrn __wiobused:word

endif

;
; _iob[] table
;

sBegin iobseg

labelNP

; ptr, cnt, base, flag, file

ifdef _WINDOWS

ifdef _QWIN
ifndef _BAT16
_iobuf <0, 0, 0, _IOREAD, _NFILE_> ; stdin
_iobuf <0, 0, 0, _IOWRT, _NFILE_> ; stdout
_iobuf <0, 0, 0, _IOWRT, _NFILE_> ; stderr

_iobuf (_NFILE_-4) dup ()

else ;_BAT16
_iobuf <0, 0, 0, _IOREAD, 0> ; stdin
_iobuf <0, 0, 0, _IOWRT, 1> ; stdout
_iobuf <0, 0, 0, _IOWRT, 2> ; stderr

_iobuf (_NFILE_-4) dup ()
endif ;!_BAT16
else

_iobuf (_NFILE_-1) dup () ; No stdin/out/err

endif ;_QWIN

else ;!_WINDOWS

_iobuf <0, 0, 0, _IOREAD, 0> ; stdin
_iobuf <0, 0, 0, _IOWRT, 1> ; stdout
_iobuf <0, 0, 0, _IOWRT, 2> ; stderr


_iobuf <_aux._charbuf, 0, _aux._charbuf, _IORW OR _IONBF, 3> ; stdaux
_iobuf <0, 0, 0, _IOWRT, 4> ; stdprn

_iobuf (_NFILE_-6) dup ()


endif ;_WINDOWS

sEnd


;
; Last entry in _iob[] table
;

sBegin iobeseg

__last _iobuf

sEnd

;
; _iob2[] table
;

sBegin iob2seg

labelNP

; flag2, charbuf, bufsiz, tmpnum, padding

ifdef _WINDOWS

ifdef _QWIN

_iobuf2 <0, 0, 0, 0> ; stdin
_iobuf2 <0, 0, 0, 0> ; stdout
_iobuf2 <0, 0, 0, 0> ; stderr

_iobuf2 (_NFILE_-4) dup ()

else

_iobuf2 (_NFILE_-1) dup () ; No stdin/out/err

endif ;_QWIN

else ;!_WINDOWS

_iobuf2 <0, 0, 0, 0> ; stdin
_iobuf2 <0, 0, 0, 0> ; stdout
_iobuf2 <0, 0, 0, 0> ; stderr


_aux _iobuf2 <0, 0, 1, 0> ; stdaux
_iobuf2 <0, 0, 0, 0> ; stdprn

_iobuf2 (_NFILE_-6) dup ()


endif ;_WINDOWS

sEnd

;
; Last entry in _iob2[] table
;

sBegin iob2eseg

_iobuf2

sEnd

;
; Make _lastiob entry available
;

sBegin data
assumes ds,data

labelNP
dw dataOFFSET __last

sEnd

end