Forth 2012: RESIZE-FILE

( ud fileid -- ior )

Set the size of the file identified by fileid to ud. ior is the implementation-defined I/O result code.

If the resultant file is larger than the file before the operation, the portion of the file added as a result of the operation might not have been written.

At the conclusion of the operation, FILE-SIZE returns the value ud and FILE- POSITION returns an unspecified value.

See:

11.6.1.2080 READ-FILE, 11.6.1.2090 READ-LINE.

Testing:

setpad
T{ fn2 R/W BIN OPEN-FILE SWAP fid2 ! -> 0 }T
T{ 37. fid2 @ RESIZE-FILE -> 0 }T
T{ fid2 @ FILE-SIZE -> 37. 0 }T
T{ 0. fid2 @ REPOSITION-FILE -> 0 }T
T{ cbuf buf 100 fid2 @ READ-FILE -> 37 0 }T
T{ PAD 37 buf 37 COMPARE -> 0 }T
T{ PAD 38 buf 38 COMPARE -> 1 }T
T{ 500. fid2 @ RESIZE-FILE -> 0 }T
T{ fid2 @ FILE-SIZE -> 500. 0 }T
T{ 0. fid2 @ REPOSITION-FILE -> 0 }T
T{ cbuf buf 100 fid2 @ READ-FILE -> 100 0 }T
T{ PAD 37 buf 37 COMPARE -> 0 }T
T{ fid2 @ CLOSE-FILE -> 0 }T