Fixed length records: Difference between revisions
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(→{{header|TXR}}: Forth blocks task.) |
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=={{header|TXR}}== |
=={{header|TXR}}== |
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===80 Column Task=== |
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At the shell prompt: |
At the shell prompt: |
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This handles a final bit that is shorter than 80. When <code>buf-set-length</code> sets the buffer size back to 80, zero padding is applied. The zero-padded record is reversed. |
This handles a final bit that is shorter than 80. When <code>buf-set-length</code> sets the buffer size back to 80, zero padding is applied. The zero-padded record is reversed. |
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===Forth Blocks Task=== |
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====Encoding==== |
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The following program is called <code>forth-enblock.tl</code>: |
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<syntaxhighlight lang="txrlisp">(typedef forth-line (array 64 bchar)) |
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(let ((lno 0) |
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(blanks (make-buf 64 #\space))) |
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(whilet ((line (get-line))) |
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(put-obj (fmt "~-64,64a" line) (ffi forth-line)) |
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(inc lno)) |
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(while (plusp (mod (pinc lno) 16)) |
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(put-buf blanks)))</syntaxhighlight> |
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{{out}} |
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<pre>$ txr forth-enblock.tl < forth-enblock.tl > forth-enblock.blk |
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$ xxd forth-enblock.blk |
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00000000: 2874 7970 6564 6566 2066 6f72 7468 2d6c (typedef forth-l |
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00000010: 696e 6520 2861 7272 6179 2036 3420 6263 ine (array 64 bc |
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00000020: 6861 7229 2920 2020 2020 2020 2020 2020 har)) |
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00000030: 2020 2020 2020 2020 2020 2020 2020 2020 |
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00000040: 2020 2020 2020 2020 2020 2020 2020 2020 |
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00000050: 2020 2020 2020 2020 2020 2020 2020 2020 |
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00000060: 2020 2020 2020 2020 2020 2020 2020 2020 |
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00000070: 2020 2020 2020 2020 2020 2020 2020 2020 |
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00000080: 286c 6574 2028 286c 6e6f 2030 2920 2020 (let ((lno 0) |
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[... snip ...] |
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000003e0: 2020 2020 2020 2020 2020 2020 2020 2020 |
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000003f0: 2020 2020 2020 2020 2020 2020 2020 2020</pre> |
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====Decoding==== |
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This is <code>forth-deblock.tl</code> |
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<syntaxhighlight lang="txrlisp">(typedef forth-block (array 16 (array 64 bchar))) |
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(defsymacro fbsz (sizeof forth-block)) |
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(let* ((buf (make-buf fbsz)) |
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(block-view (carray-buf buf (ffi forth-block))) |
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(nread fbsz)) |
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(while (eql fbsz nread) |
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(set nread (fill-buf-adjust buf)) |
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(when (plusp nread) |
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(buf-set-length buf fbsz #\space) |
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(each ((row [block-view 0])) |
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(put-line (trim-right #/ +/ row))))))</syntaxhighlight> |
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{{out}} |
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<pre>$ txr forth-deblock.tl < forth-enblock.blk |
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(typedef forth-line (array 64 bchar)) |
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(let ((lno 0) |
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(blanks (make-buf 64 #\space))) |
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(whilet ((line (get-line))) |
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(put-obj (fmt "~-64,64a" line) (ffi forth-line)) |
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(inc lno)) |
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(while (plusp (mod (pinc lno) 16)) |
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(put-buf blanks))) |
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</pre> |
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=={{header|Wren}}== |
=={{header|Wren}}== |
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