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qbckfr.arc
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TSTAVAIL.ASC
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Text File
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1986-06-25
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2KB
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62 lines
'TSTAVAIL.ASC / Test Program for CSS Available Disk Space Routine
'(c) COPYRIGHT Cyberphilia Software Solutions, New York, NY 1986.
'
'Parameters: DRV% ....... drive specifier
' CLAVAIL% ... available clusters
' CLSIZE% .... bytes per cluster
'
'
'CALLing Considerations:
'
'From BASIC ... CALL CSSAVAIL(DRV%,CLAVAIL%,CLSIZE%)
'
' Where ... DRV% is 0 for default, 1 for A, 2 for B, etc.
' CLAVAIL% is initialized to 0 before call
' CLSIZE% is initialized to 0 before call
'
'
'CALL Return Considerations:
'
' DRV% will be set to FFFFh if drive specified is invalid
'
' To determine number of bytes available on specified drive
' simply multiply CLAVAIL% by CLSIZE%.
'
' All numeric parameters passed to an assembly language routine
' from BASIC must be in integer format. Either execute a
' DEFINT at the top of your BASIC program or suffix the numeric
' variables with '%'.
'
' Since the result of the multiplication will probably exceed the
' 32767 limit of integers make sure you place each returned value
' of the call into a double precision number, for example:
'
' CLAVAIL# = CLAVAIL%
' CLSIZE# = CLSIZE%
' BYTES.LEFT# = CLAVAIL# * CLSIZE#
'
' - Or -
'
' BYTES.LEFT# = CLAVAIL%
' BYTES.LEFT# = BYTES.LEFT# * CLSIZE%
'
'
' Do not try BYTES.LEFT# = CLAVAIL% * CLSIZE% since BASIC
' computes from right to left, you will receive an OVERFLOW
' error before it gets to place the result into BYTES.LEFT#
'
'
DRV% = 3
CLAVAIL% = 0
CLSIZE% = 0
'
CALL CSSAVAIL(DRV%,CLAVAIL%,CLSIZE%)
'
BYTES.LEFT# = CLAVAIL%
BYTES.LEFT# = BYTES.LEFT# * CLSIZE%
'
CLS
PRINT "Number of bytes available on drive C: ... ";BYTES.LEFT#
'
END