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Commit	Line	Data
	1	/* @(#)ttoutput.c 8.1 (Berkeley) 6/6/93 */
	2	/* $NetBSD: ttoutput.c,v 1.9 2009/04/14 08:50:06 lukem Exp $ */
	3
	4	/*
	5	* Copyright (c) 1983, 1993
	6	* The Regents of the University of California. All rights reserved.
	7	*
	8	* This code is derived from software contributed to Berkeley by
	9	* Edward Wang at The University of California, Berkeley.
	10	*
	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions and the following disclaimer.
	16	* 2. Redistributions in binary form must reproduce the above copyright
	17	* notice, this list of conditions and the following disclaimer in the
	18	* documentation and/or other materials provided with the distribution.
	19	* 3. Neither the name of the University nor the names of its contributors
	20	* may be used to endorse or promote products derived from this software
	21	* without specific prior written permission.
	22	*
	23	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	24	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	26	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	29	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	30	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	31	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	32	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	33	* SUCH DAMAGE.
	34	*/
	35
	36	#include <errno.h>
	37	#include <string.h>
	38	#include <unistd.h>
	39	#include "ww.h"
	40	#include "tt.h"
	41
	42	/*
	43	* Buffered output package.
	44	* We need this because stdio fails on non-blocking writes.
	45	*/
	46
	47	void
	48	ttflush(void)
	49	{
	50	char *p;
	51	int n = tt_obp - tt_ob;
	52
	53	if (n == 0)
	54	return;
	55	if (tt.tt_checksum)
	56	(*tt.tt_checksum)(tt_ob, n);
	57	if (tt.tt_flush) {
	58	(*tt.tt_flush)();
	59	return;
	60	}
	61	wwnflush++;
	62	for (p = tt_ob; p < tt_obp;) {
	63	wwnwr++;
	64	n = write(1, p, tt_obp - p);
	65	if (n < 0) {
	66	wwnwre++;
	67	if (errno != EWOULDBLOCK) {
	68	/* can't deal with this */
	69	p = tt_obp;
	70	}
	71	} else if (n == 0) {
	72	/* what to do? */
	73	wwnwrz++;
	74	} else {
	75	wwnwrc += n;
	76	p += n;
	77	}
	78	}
	79	tt_obp = tt_ob;
	80	}
	81
	82	void
	83	ttputs(const char *s)
	84	{
	85	while (*s)
	86	ttputc(*s++);
	87	}
	88
	89	void
	90	ttwrite(const char *s, int n)
	91	{
	92	switch (n) {
	93	case 0:
	94	break;
	95	case 1:
	96	ttputc(*s);
	97	break;
	98	case 2:
	99	if (tt_obe - tt_obp < 2)
	100	ttflush();
	101	tt_obp++ = s++;
	102	tt_obp++ = s;
	103	break;
	104	case 3:
	105	if (tt_obe - tt_obp < 3)
	106	ttflush();
	107	tt_obp++ = s++;
	108	tt_obp++ = s++;
	109	tt_obp++ = s;
	110	break;
	111	case 4:
	112	if (tt_obe - tt_obp < 4)
	113	ttflush();
	114	tt_obp++ = s++;
	115	tt_obp++ = s++;
	116	tt_obp++ = s++;
	117	tt_obp++ = s;
	118	break;
	119	case 5:
	120	if (tt_obe - tt_obp < 5)
	121	ttflush();
	122	tt_obp++ = s++;
	123	tt_obp++ = s++;
	124	tt_obp++ = s++;
	125	tt_obp++ = s++;
	126	tt_obp++ = s;
	127	break;
	128	default:
	129	while (n > 0) {
	130	int m;
	131
	132	while ((m = tt_obe - tt_obp) == 0)
	133	ttflush();
	134	if ((m = tt_obe - tt_obp) > n)
	135	m = n;
	136	memmove(tt_obp, s, m);
	137	tt_obp += m;
	138	s += m;
	139	n -= m;
	140	}
	141	}
	142	}