47 lines
2.6 KiB
C
47 lines
2.6 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "dsp/tty/tty.h"
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#include "libc/assert.h"
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#include "libc/calls/termios.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/termios.h"
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/**
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* Applies configuration to teletypewriter.
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*
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* @param opt_out_oldconf is only modified if successful
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* @return 0 on success, or -1 w/ errno
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* @see ttyconfig(), ttyrestore()
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*/
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int ttyconfig(int ttyfd, ttyconf_f fn, int64_t arg,
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const struct termios *opt_out_oldconf) {
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struct termios conf[2];
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if (tcgetattr(ttyfd, &conf[0]) != -1 &&
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fn(memcpy(&conf[1], &conf[0], sizeof(conf[0])), arg) != -1 &&
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tcsetattr(ttyfd, TCSAFLUSH, &conf[1]) != -1) {
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if (opt_out_oldconf) {
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memcpy(opt_out_oldconf, &conf[0], sizeof(conf[0]));
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}
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return 0;
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} else {
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return -1;
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}
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}
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