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page ,132
title fmsghdr - far message handler and finder
;***
;fmsghdr.asm - far message handler and finder
;
; Copyright (c) 1986-1990, Microsoft Corporation. All rights reserved.
;
;Purpose:
; Far message handler and finder.
;
;*******************************************************************************


?DF= 1 ; this is special for c startup
include version.inc
?PLM= 1 ; pascal calling conventions
.xlist
include cmacros.inc
include msdos.inc
.list

createSeg _TEXT, code, word, public, CODE, <>

createSeg _DATA, data, word, public, DATA, DGROUP

createSeg FAR_HDR,fhdr, byte, public, FAR_MSG,FMGROUP
createSeg FAR_MSG,fmsg, byte, public, FAR_MSG,FMGROUP
createSeg FAR_PAD,fpad, byte, common, FAR_MSG,FMGROUP
createSeg FAR_EPAD,fepad, byte, common, FAR_MSG,FMGROUP

defGrp DGROUP ; define DGROUP
defGrp FMGROUP ; define FMGROUP

codeOFFSET equ offset _TEXT:
fmsgOFFSET equ offset FMGROUP:


sBegin fhdr
assumes ds,data

db '<>'
stfmsg label byte

sEnd

SBegin fpad
assumes ds,data

dw -1 ; message padding marker

sEnd

sBegin fepad
assumes ds,data

db -1

sEnd


sBegin code
assumes cs,code
assumes ds,data

page
;***
;__FMSG_TEXT(messagenumber) - find message for given message number
;
;Purpose:
; This routine returns a far pointer to the message associated with
; messagenumber. If the message does not exist, then a 0:0 is returned.
;
;Entry:
; ==PASCAL CALLING CONVENTIONS==
; messagenumber = WORD number of desired message
;
;Exit:
; DX:AX = pointer to message text or 0:0 if message doesn't exist
;
;Uses:
;
;Exceptions:
;
;*******************************************************************************

cProc __FMSG_TEXT,, ; pascal calling

parmW msgt

cBegin
mov ax,FMGROUP
mov ds,ax ; ds = FMGROUP (force it always)
push ds
pop es
mov dx,msgt ; dx = message number
mov si,fmsgOFFSET stfmsg ; start of far messages

tloop:
lodsw ; ax = current message number
cmp ax,dx
je found ; found it - return address
inc ax
xchg ax,si
jz found ; at end and not found - return 0
xchg di,ax
xor ax,ax
mov cx,-1
repne scasb ; skip until 00
mov si,di
jmp tloop ; try next entry

found:
xchg ax,si
cwd ; zero out dx in case NULL
or ax,ax
jz notfound
mov dx,ds ; remember segment selector
notfound:
cEnd

sEnd

end