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AX = 7160h CL = 00h 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 filename or path (either long name or short name) ES:DI -> 261-byte buffer for canonicalized 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 fully qualified name AX destroyed
Desc: Determine the canonical name of the specified filename or path, corresponding to the undocumented TRUENAME command in COMMAND.COM
Notes: If a complete path is given, the result will be a short-form complete path; otherwise, the given relative path is appended to the short-form current directory name, '.'/'..'/'...'/etc. are resolved, and the final result uppercased without converting any remaining long-form names to short-form. For compatibility with DOS versions prior to v7.00, the carry flag should be set on call to ensure that it is set on exit
BUG: 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=01h
Category: DOS Kernel - Int 21h - W
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