Category: DOS kernel
INT 21 - Windows95 - LONG FILENAME - "TRUENAME" - CANONICALIZE PATH 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 SeeAlso: AH=60h,AX=7160h/CL=01h