1/*	$NetBSD: ttoutput.c,v 1.8 2003/08/13 15:14:55 itojun Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Edward Wang at The University of California, Berkeley.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)ttoutput.c	8.1 (Berkeley) 6/6/93";
39#else
40__RCSID("$NetBSD: ttoutput.c,v 1.8 2003/08/13 15:14:55 itojun Exp $");
41#endif
42#endif /* not lint */
43
44#include <errno.h>
45#include <string.h>
46#include <unistd.h>
47#include "ww.h"
48#include "tt.h"
49
50/*
51 * Buffered output package.
52 * We need this because stdio fails on non-blocking writes.
53 */
54
55void
56ttflush(void)
57{
58	char *p;
59	int n = tt_obp - tt_ob;
60
61	if (n == 0)
62		return;
63	if (tt.tt_checksum)
64		(*tt.tt_checksum)(tt_ob, n);
65	if (tt.tt_flush) {
66		(*tt.tt_flush)();
67		return;
68	}
69	wwnflush++;
70	for (p = tt_ob; p < tt_obp;) {
71		wwnwr++;
72		n = write(1, p, tt_obp - p);
73		if (n < 0) {
74			wwnwre++;
75			if (errno != EWOULDBLOCK) {
76				/* can't deal with this */
77				p = tt_obp;
78			}
79		} else if (n == 0) {
80			/* what to do? */
81			wwnwrz++;
82		} else {
83			wwnwrc += n;
84			p += n;
85		}
86	}
87	tt_obp = tt_ob;
88}
89
90void
91ttputs(const char *s)
92{
93	while (*s)
94		ttputc(*s++);
95}
96
97void
98ttwrite(const char *s, int n)
99{
100	switch (n) {
101	case 0:
102		break;
103	case 1:
104		ttputc(*s);
105		break;
106	case 2:
107		if (tt_obe - tt_obp < 2)
108			ttflush();
109		*tt_obp++ = *s++;
110		*tt_obp++ = *s;
111		break;
112	case 3:
113		if (tt_obe - tt_obp < 3)
114			ttflush();
115		*tt_obp++ = *s++;
116		*tt_obp++ = *s++;
117		*tt_obp++ = *s;
118		break;
119	case 4:
120		if (tt_obe - tt_obp < 4)
121			ttflush();
122		*tt_obp++ = *s++;
123		*tt_obp++ = *s++;
124		*tt_obp++ = *s++;
125		*tt_obp++ = *s;
126		break;
127	case 5:
128		if (tt_obe - tt_obp < 5)
129			ttflush();
130		*tt_obp++ = *s++;
131		*tt_obp++ = *s++;
132		*tt_obp++ = *s++;
133		*tt_obp++ = *s++;
134		*tt_obp++ = *s;
135		break;
136	default:
137		while (n > 0) {
138			int m;
139
140			while ((m = tt_obe - tt_obp) == 0)
141				ttflush();
142			if ((m = tt_obe - tt_obp) > n)
143				m = n;
144			memmove(tt_obp, s, m);
145			tt_obp += m;
146			s += m;
147			n -= m;
148		}
149	}
150}
151