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AH = 13h
DS:DX -> unopened FCB (see #01345), filename filled with template for
deletion ('?' wildcards allowed)
Return:
AL = status
00h one or more files successfully deleted
FFh no matching files or all were read-only or locked
Notes: DOS 1.25+ deletes everything in the current directory (including subdirectories) and sets the first byte of the name to 00h (entry never used) instead of E5h if called on an extended FCB with filename '???????????' and bits 0-4 of the attribute set (bits 1 and 2 for DOS 1.x). This may have originally been an optimization to minimize directory searching after a mass deletion (DOS 1.25+ stop the directory search upon encountering a never-used entry), but can corrupt the filesystem under DOS 2+ because subdirectories are removed without deleting the files they contain.. Currently-open files should not be deleted. MS-DOS allows deletion of read-only files with an extended FCB, whereas Novell NetWare, DR DOS 6, and Novell DOS 7/OpenDOS 7.01 do not. This function generates a trap "D" under OS/2 v4.x (Warp4) when called on an HPFS partition with a wildcard in the filename; it operates correctly on FAT partitions and when called without wildcards
See Also: AH=41h - INT 2F/AX=1113h
Category: DOS Kernel - Int 21h - D
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