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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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