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Belgian Amiga Club - ADF Collection
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BS1 part 41.zip
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BS1 part 41
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Devpac 2.12 disk 1.adf
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examples
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freemem.s
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1988-10-06
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* file examples/freemem.s
* a sample Intuition program to display a window constantly showing
* the free memory figure, until it's closed
* this source code (C) HiSoft 1987 All Rights Reserved
* both source and binary are FreeWare and may be distributed free of charge
* so long as copyright messages are not removed
* revision history:
* 7th June 86 written
* 22nd Sept 86 changed includes
* ensure case dependent and debug
opt c+,d+
* firstly get the required constants and macros
incdir ":include/"
include intuition/intuition.i
include intuition/intuition_lib.i
include exec/exec_lib.i
include graphics/graphics_lib.i
include exec/memory.i
include libraries/dos_lib.i
include libraries/dos.i
* constant for frequency of re-display
timeout equ 25 in 50ths of a second
* firstly open the intuition library
lea intname(pc),a1
moveq #0,d0 dont care which version
CALLEXEC OpenLibrary
tst.l d0
beq goawayfast if didnt open
move.l d0,_IntuitionBase store lib pointer
* and open the graphics library
lea grafname(pc),a1
moveq #0,d0
CALLEXEC OpenLibrary
tst.l d0
beq goawaycloseint
move.l d0,_GfxBase
* and open a DOS library
lea dosname(pc),a1
moveq #0,d0
CALLEXEC OpenLibrary
tst.l d0
beq goawayclosegraf
move.l d0,_DOSBase
* open a window next
lea windowdef(pc),a0
CALLINT OpenWindow
tst.l d0
beq goawaycloseall if no window
move.l d0,windowptr store the pointer
move.l #-1,oldfreemem
* the main loop - display the figure, then wait, then loop
mainloop
moveq #MEMF_PUBLIC,d1
CALLEXEC AvailMem get the figure
* got free mem, see if changed since last time
cmp.l oldfreemem,d0
beq messagetest dont print if the same
move.l d0,oldfreemem
* free memory in d0.l, so convert to a hex string
* converting to decimal is left as an exercise to the reader!
lea thestring(pc),a0
bsr hexconvert
* replace leading zeros with spaces
lea thestring(pc),a0
moveq #7-1,d0 max to do
convspaces
cmp.b #'0',(a0)
bne.s noconvspaces
move.b #' ',(a0)+
dbf d0,convspaces convert them
noconvspaces
* move the cursor to a suitable place
moveq #4,d0 x posn
moveq #20,d1 y posn
move.l windowptr(pc),a1
move.l wd_RPort(a1),a1 get rastport for window
CALLGRAF Move
* and print the string
move.l windowptr(pc),a1
move.l wd_RPort(a1),a1
lea thestring(pc),a0 string
moveq #thestringlen,d0 length
CALLGRAF Text
* now see if a message is waiting for me
messagetest
move.l windowptr(pc),a0
move.l wd_UserPort(a0),a0 windows message port
CALLEXEC GetMsg
tst.l d0
beq.s nomessage
* there was a message, which in our case must be CLOSEWINDOW,
* so we should reply then go away
move.l d0,a1
CALLEXEC ReplyMsg
bra.s closewindow
* no messages waiting, so suspend myself for a short while then
* do it all agaun
nomessage
move.l #timeout,d1
CALLDOS Delay wait a while
bra mainloop
* close clicked so close the window
closewindow
move.l windowptr(pc),a0
CALLINT CloseWindow
* close all the libraries
goawaycloseall
move.l _DOSBase,a1
CALLEXEC CloseLibrary
* close the graphics library
goawayclosegraf
move.l _GfxBase,a1
CALLEXEC CloseLibrary
* finished so close Intuition library
goawaycloseint
move.l _IntuitionBase,a1
CALLEXEC CloseLibrary
goawayfast
moveq #0,d0
rts
* convert d0.l into a string at (a0) onwards in hex
hexconvert
moveq #8-1,d1 digit count
hexclp rol.l #4,d0
move.l d0,d2 save it
and.b #$f,d0
cmp.b #9,d0
ble.s hexdig
addq.b #7,d0
hexdig add.b #'0',d0
move.b d0,(a0)+ do a digit
move.l d2,d0 restore long
dbf d1,hexclp do all of the digits
rts
* window definition here
windowdef dc.w 50,50 x posn, y posn
dc.w 200,25 width,height
dc.b -1,-1 default pens
dc.l CLOSEWINDOW easy IDCMP flag
dc.l WINDOWDEPTH!WINDOWCLOSE!SMART_REFRESH!ACTIVATE!WINDOWDRAG
dc.l 0 no gadgets
dc.l 0 no checkmarks
dc.l windowtitle title of window
dc.l 0 no screen
dc.l 0 no bitmap
dc.w 0,0,0,0 minimum, irrelevant as no sizing gadget
dc.w WBENCHSCREEN in workbench
* strings here
intname INTNAME name of intuition lib
grafname GRAFNAME name of graphics library
dosname DOSNAME name of dos library
windowtitle dc.b ' ',$a9,' HiSoft 1987 ',0
thestring dc.b '00000000 bytes free'
thestringlen equ *-thestring
* variables here
_IntuitionBase dc.l 0 for int library
_GfxBase dc.l 0 for graphics library
_DOSBase dc.l 0 for dos library
windowptr dc.l 0 for window ptr
oldfreemem dc.l 0 for freemem