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Int 21 Fn 29 - DOS 1+ - Parse Filename Into Fcb [D]
AH = 29h
AL = parsing options (see below)
DS:SI -> filename string (both '*' and '?' wildcards OK)
ES:DI -> buffer for unopened FCB
Return: AL = result code
00h successful parse, no wildcards encountered
01h successful parse, wildcards present
FFh failed (invalid drive specifier)
DS:SI -> first unparsed character
ES:DI buffer filled with unopened FCB (see AH=0Fh)
Notes: asterisks expanded to question marks in the FCB
all processing stops when a filename terminator is encountered
cannot be used with filespecs which include a path (DOS 2+)
Novell NetWare monitors the result code since an 'invalid drive' may
signal an attempt to reconnect a network drive; if there are no
connections to the specified drive, NetWare attempts to build a
connection and map the drive to the SYS:LOGIN directory
See Also: AH=0Fh,AH=16h,AH=26h
Bitfields for parsing options:
bit 0 skip leading separators
bit 1 use existing drive number in FCB if no drive is specified, instead of
setting field to zero
bit 2 use existing filename in FCB if no base name is specified, instead of
filling field with blanks
bit 3 use existing extension in FCB if no extension is specified, instead of
filling field with blanks
bits 4-7 reserved (0)
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