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1.3 ! downsj 1: /* $OpenBSD$ */
1.1 deraadt 2: /* $NetBSD: ttoutput.c,v 1.3 1995/09/28 10:34:51 tls 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. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the University of
22: * California, Berkeley and its contributors.
23: * 4. Neither the name of the University nor the names of its contributors
24: * may be used to endorse or promote products derived from this software
25: * without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37: * SUCH DAMAGE.
38: */
39:
40: #ifndef lint
41: #if 0
42: static char sccsid[] = "@(#)ttoutput.c 8.1 (Berkeley) 6/6/93";
43: #else
1.3 ! downsj 44: static char rcsid[] = "$OpenBSD$";
1.1 deraadt 45: #endif
46: #endif /* not lint */
47:
48: #include "ww.h"
49: #include "tt.h"
50: #include <sys/errno.h>
51:
52: /*
53: * Buffered output package.
54: * We need this because stdio fails on non-blocking writes.
55: */
56:
57: ttflush()
58: {
59: register char *p;
60: register n = tt_obp - tt_ob;
61: extern errno;
62:
63: if (n == 0)
64: return;
65: if (tt.tt_checksum)
66: (*tt.tt_checksum)(tt_ob, n);
67: if (tt.tt_flush) {
68: (*tt.tt_flush)();
69: return;
70: }
71: wwnflush++;
72: for (p = tt_ob; p < tt_obp;) {
73: wwnwr++;
74: n = write(1, p, tt_obp - p);
75: if (n < 0) {
76: wwnwre++;
77: if (errno != EWOULDBLOCK) {
78: /* can't deal with this */
79: p = tt_obp;
80: }
81: } else if (n == 0) {
82: /* what to do? */
83: wwnwrz++;
84: } else {
85: wwnwrc += n;
86: p += n;
87: }
88: }
89: tt_obp = tt_ob;
90: }
91:
92: ttputs(s)
93: register char *s;
94: {
95: while (*s)
96: ttputc(*s++);
97: }
98:
99: ttwrite(s, n)
100: register char *s;
101: register n;
102: {
103: switch (n) {
104: case 0:
105: break;
106: case 1:
107: ttputc(*s);
108: break;
109: case 2:
110: if (tt_obe - tt_obp < 2)
111: ttflush();
112: *tt_obp++ = *s++;
113: *tt_obp++ = *s;
114: break;
115: case 3:
116: if (tt_obe - tt_obp < 3)
117: ttflush();
118: *tt_obp++ = *s++;
119: *tt_obp++ = *s++;
120: *tt_obp++ = *s;
121: break;
122: case 4:
123: if (tt_obe - tt_obp < 4)
124: ttflush();
125: *tt_obp++ = *s++;
126: *tt_obp++ = *s++;
127: *tt_obp++ = *s++;
128: *tt_obp++ = *s;
129: break;
130: case 5:
131: if (tt_obe - tt_obp < 5)
132: ttflush();
133: *tt_obp++ = *s++;
134: *tt_obp++ = *s++;
135: *tt_obp++ = *s++;
136: *tt_obp++ = *s++;
137: *tt_obp++ = *s;
138: break;
139: default:
140: while (n > 0) {
141: register m;
142:
143: while ((m = tt_obe - tt_obp) == 0)
144: ttflush();
145: if ((m = tt_obe - tt_obp) > n)
146: m = n;
147: bcopy(s, tt_obp, m);
148: tt_obp += m;
149: s += m;
150: n -= m;
151: }
152: }
153: }