58 lines
1.4 KiB
Scheme
58 lines
1.4 KiB
Scheme
;;
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;; tiocgwinsz.scm
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;;
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;; Get size of current terminal.
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;;
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;; ISC License
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;;
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;; Copyright 2023 Brmlab, z.s.
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;; Dominik Pantůček <dominik.pantucek@trustica.cz>
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;;
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;; Permission to use, copy, modify, and/or distribute this software
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;; for any purpose with or without fee is hereby granted, provided
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;; that the above copyright notice and this permission notice appear
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;; in all copies.
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;;
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;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
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;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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;;
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(declare (unit tiocgwinsz))
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(module
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tiocgwinsz
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(
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tiocgwinsz
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)
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(import scheme
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(chicken foreign)
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(chicken bitwise))
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(foreign-declare "#include <sys/ioctl.h>")
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(define tiocgwinsz-ioctl
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(foreign-lambda*
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int ()
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"
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struct winsize wss;
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if (ioctl(0, TIOCGWINSZ, &wss) == 0) {
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C_return(wss.ws_row*65536+wss.ws_col);
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} else {
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C_return(0);
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}
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"
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))
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(define (tiocgwinsz)
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(let ((res (tiocgwinsz-ioctl)))
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(values (bitwise-and res #xffff)
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(arithmetic-shift res -16))))
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)
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