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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_200
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256_01
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getstrat.a
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1988-01-08
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2KB
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49 lines
;---------------------------------------------------------------------
; ASM88 FILE: GETSTRAT.A Get Memory Allocation Strategy
; ----------
; WRITTEN: 25/10/87
; -------
; PURPOSE: This is one of a series of files which take
; ------- advantage of INT 21H functions under MS-DOS.
; In each case the error situation is marked by
; the carry flag being set. We use the De Smet
; external variable '_carryf' to see whether the
; carry is set on return from the function.
; If so, the error code can be used to obtain
; information about the specific error.
;
; USAGE: int GETSTRAT(&_carryf)
; ----- char *_carryf;
;
; DEPENDENCIES: De Smet C V 2.44+
; ------------
; Copyright 1987 - Cogar Computer Services Pty. Ltd
;---------------------------------------------------------------------
CSEG
PUBLIC GETSTRAT_
GETSTRAT_:
push bp ; normal De Smet C start
mov bp,sp ; point to the stack
mov ax,ds ; and make ES common with DS
mov es,ax
;----------------------------------------------------------------------
; The unique programme follows.
;----------------------------------------------------------------------
mov al,0
mov ah,58h ; the function code
int 21h
jc GETSTRAT_ERROR
jmp GETSTRAT_QUIT
GETSTRAT_ERROR:
mov si,[bp+4] ; get address of '_carryf' variable
mov byte [si],1 ; return with _carryf = 1
;----------------------------------------------------------------------
; Normal programme termination.
;----------------------------------------------------------------------
GETSTRAT_QUIT:
pop bp ; restore starting conditions
ret
;----------------------------------------------------------------------