179 lines
5.2 KiB
C
179 lines
5.2 KiB
C
/*-
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* Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
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* All rights reserved.
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*
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* Portions of this software were developed under sponsorship from Snow
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* B.V., the Netherlands.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_TTYQUEUE_H_
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#define _SYS_TTYQUEUE_H_
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#ifndef _SYS_TTY_H_
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#error "can only be included through <sys/tty.h>"
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#endif /* !_SYS_TTY_H_ */
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struct tty;
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struct ttyinq_block;
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struct ttyoutq_block;
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struct uio;
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/* Data input queue. */
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struct ttyinq {
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struct ttyinq_block *ti_firstblock;
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struct ttyinq_block *ti_startblock;
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struct ttyinq_block *ti_reprintblock;
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struct ttyinq_block *ti_lastblock;
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unsigned int ti_begin;
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unsigned int ti_linestart;
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unsigned int ti_reprint;
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unsigned int ti_end;
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unsigned int ti_nblocks;
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unsigned int ti_quota;
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};
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#define TTYINQ_DATASIZE 128
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/* Data output queue. */
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struct ttyoutq {
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struct ttyoutq_block *to_firstblock;
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struct ttyoutq_block *to_lastblock;
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unsigned int to_begin;
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unsigned int to_end;
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unsigned int to_nblocks;
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unsigned int to_quota;
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};
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#define TTYOUTQ_DATASIZE (256 - sizeof(struct ttyoutq_block *))
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#ifdef _KERNEL
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/* Input queue handling routines. */
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void ttyinq_setsize(struct ttyinq *ti, struct tty *tp, size_t len);
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void ttyinq_free(struct ttyinq *ti);
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int ttyinq_read_uio(struct ttyinq *ti, struct tty *tp, struct uio *uio,
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size_t readlen, size_t flushlen);
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size_t ttyinq_write(struct ttyinq *ti, const void *buf, size_t len,
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int quote);
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int ttyinq_write_nofrag(struct ttyinq *ti, const void *buf, size_t len,
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int quote);
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void ttyinq_canonicalize(struct ttyinq *ti);
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size_t ttyinq_findchar(struct ttyinq *ti, const char *breakc, size_t maxlen,
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char *lastc);
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void ttyinq_flush(struct ttyinq *ti);
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int ttyinq_peekchar(struct ttyinq *ti, char *c, int *quote);
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void ttyinq_unputchar(struct ttyinq *ti);
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void ttyinq_reprintpos_set(struct ttyinq *ti);
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void ttyinq_reprintpos_reset(struct ttyinq *ti);
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static __inline size_t
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ttyinq_getsize(struct ttyinq *ti)
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{
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return (ti->ti_nblocks * TTYINQ_DATASIZE);
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}
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static __inline size_t
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ttyinq_getallocatedsize(struct ttyinq *ti)
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{
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return (ti->ti_quota * TTYINQ_DATASIZE);
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}
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static __inline size_t
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ttyinq_bytesleft(struct ttyinq *ti)
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{
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size_t len;
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/* Make sure the usage never exceeds the length. */
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len = ti->ti_nblocks * TTYINQ_DATASIZE;
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MPASS(len >= ti->ti_end);
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return (len - ti->ti_end);
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}
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static __inline size_t
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ttyinq_bytescanonicalized(struct ttyinq *ti)
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{
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MPASS(ti->ti_begin <= ti->ti_linestart);
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return (ti->ti_linestart - ti->ti_begin);
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}
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static __inline size_t
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ttyinq_bytesline(struct ttyinq *ti)
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{
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MPASS(ti->ti_linestart <= ti->ti_end);
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return (ti->ti_end - ti->ti_linestart);
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}
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/* Input buffer iteration. */
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typedef void ttyinq_line_iterator_t(void *data, char c, int flags);
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void ttyinq_line_iterate_from_linestart(struct ttyinq *ti,
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ttyinq_line_iterator_t *iterator, void *data);
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void ttyinq_line_iterate_from_reprintpos(struct ttyinq *ti,
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ttyinq_line_iterator_t *iterator, void *data);
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/* Output queue handling routines. */
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void ttyoutq_flush(struct ttyoutq *to);
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void ttyoutq_setsize(struct ttyoutq *to, struct tty *tp, size_t len);
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void ttyoutq_free(struct ttyoutq *to);
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size_t ttyoutq_read(struct ttyoutq *to, void *buf, size_t len);
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int ttyoutq_read_uio(struct ttyoutq *to, struct tty *tp, struct uio *uio);
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size_t ttyoutq_write(struct ttyoutq *to, const void *buf, size_t len);
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int ttyoutq_write_nofrag(struct ttyoutq *to, const void *buf, size_t len);
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static __inline size_t
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ttyoutq_getsize(struct ttyoutq *to)
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{
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return (to->to_nblocks * TTYOUTQ_DATASIZE);
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}
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static __inline size_t
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ttyoutq_getallocatedsize(struct ttyoutq *to)
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{
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return (to->to_quota * TTYOUTQ_DATASIZE);
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}
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static __inline size_t
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ttyoutq_bytesleft(struct ttyoutq *to)
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{
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size_t len;
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/* Make sure the usage never exceeds the length. */
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len = to->to_nblocks * TTYOUTQ_DATASIZE;
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MPASS(len >= to->to_end);
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return (len - to->to_end);
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}
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static __inline size_t
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ttyoutq_bytesused(struct ttyoutq *to)
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{
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return (to->to_end - to->to_begin);
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}
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#endif /* _KERNEL */
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#endif /* !_SYS_TTYQUEUE_H_ */
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