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OS/2 Shareware BBS: 10 Tools
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VALID.BAS
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BASIC Source File
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1989-03-23
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515b
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21 lines
'***** Valid.Bas - BASIC function that reports if a drive
' letter is valid
'syntax: Okay = Valid%(Drive$)
' where: Okay receives -1 if the drive is valid, or zero if it is not
DEFINT A-Z
DECLARE SUB DosQCurDisk(SEG Temp, SEG DriveMap&)
FUNCTION Valid%(Drive$)
Call DosQCurDisk(Temp, DriveMap&)
Drive = ASC(Drive$) - ASC("A")
IF DriveMap& AND 2 ^ Drive THEN 'Check the appropriate bit in the mask
Valid% = -1
ELSE
Valid% = 0
END IF
END FUNCTION