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Docs » Autodocs » dos.library » SetFileSize

NAME

	SetFileSize -- Sets the size of a file (V36)

SYNOPSIS

	newsize = SetFileSize(fh, offset, mode)
D0 D1 D2 D3
LONG SetFileSize(BPTR, LONG, LONG)

FUNCTION

	Changes the file size, truncating or extending as needed.  Not all
handlers may support this; be careful and check the return code. If
the file is extended, no values should be assumed for the new bytes.
If the new position would be before the filehandle's current position
in the file, the filehandle will end with a position at the
end-of-file. If there are other filehandles open onto the file, the
new size will not leave any filehandle pointing past the end-of-file.
You can check for this by looking at the new size (which would be
different than what you requested).
The seek position should not be changed unless the file is made
smaller than the current seek position. However, see BUGS.
Do NOT count on any specific values to be in any extended area.

INPUTS

	fh     - File to be truncated/extended.
offset - Offset from position determined by mode.
mode - One of OFFSET_BEGINNING, OFFSET_CURRENT, or OFFSET_END.

RESULT

	newsize - position of new end-of-file or -1 for error.

BUGS

	The RAM: filesystem and the normal Amiga filesystem act differently
in where the file position is left after SetFileSize(). RAM: leaves
you at the new end of the file (incorrectly), while the Amiga ROM
filesystem leaves the seek position alone, unless the new position
is less than the current position, in which case you're left at the
new EOF.
The best workaround is to not make any assumptions about the seek
position after SetFileSize().

SEE ALSO

Seek()

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