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