From 6acd23f6e758bddc2b204baeafc7885e837f002d Mon Sep 17 00:00:00 2001 From: sigsegv7 Date: Wed, 27 Sep 2023 09:21:24 -0400 Subject: kernel: tty_subr.c -> subr_tty.c Signed-off-by: sigsegv7 --- sys/kern/subr_tty.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 sys/kern/subr_tty.c (limited to 'sys/kern/subr_tty.c') diff --git a/sys/kern/subr_tty.c b/sys/kern/subr_tty.c new file mode 100644 index 0000000..59540e3 --- /dev/null +++ b/sys/kern/subr_tty.c @@ -0,0 +1,57 @@ +/* + * Copyright (c) 2023 Ian Marco Moffett and the VegaOS team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of VegaOS nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include + +/* + * Pushes a char to the TTY + * ring buffer. + * + * Call with TTY locked. + */ +void +tty_push_char(struct tty *tty, int c) +{ + struct tty_ring *ring; + + ring = &tty->ring; + + /* + * If our ring is full, it should + * be flushed as soon as possible. + * + * XXX: ring->len will be reset by tty_flush() + * so there is no need to do it here. + */ + if (ring->len >= LINE_RING_SIZE) { + tty_flush(tty); + } + + ring->buf[ring->len++] = c; +} -- cgit v1.2.3