Int 21/AX=7160h/CL=02h

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Windows95 - LONG FILENAME - GET CANONICAL LONG FILENAME OR PATH

AX = 7160h
CL = 02h
CH = SUBST expansion flag
00h return a path containing true path for a SUBSTed drive letter
80h return a path containing the SUBSTed drive letter
DS:SI -> ASCIZ short filename or path
ES:DI -> 261-byte buffer for canonicalized long name

Return:
CF set on error AX = error code 02h invalid component in directory path or drive letter only 03h malformed path or invalid drive letter ES:DI buffer unchanged CF clear if successful ES:DI buffer filled with qualified long name (can contain lowercase letters)

Desc: Determine the canonical name of the specified filename or path, corresponding to the undocumented TRUENAME command in COMMAND.COM

BUGS: Even though the maximum length of a complete long pathname is 260 characters, Windows95 returns CF set/AX=0003h even if the file exists whenever the full pathname is more than 255 characters. Windows95 incorrectly treats filenames where the first two characters after the drive letter and colon are both slashes (either forward or backward) as a UNC (network name) and requires several seconds to attempt to resolve the name before returning an unchanged string

See Also: AH=60h - AX=7160h/CL=00h - AX=7160h/CL=01h

Category: DOS Kernel - Int 21h - W

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