Annotation of src/usr.bin/window/ttoutput.c, Revision 1.8
1.8 ! deraadt 1: /* $OpenBSD: ttoutput.c,v 1.7 2004/03/16 01:11:09 tedu Exp $ */
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.
1.5 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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: #ifndef lint
37: #if 0
38: static char sccsid[] = "@(#)ttoutput.c 8.1 (Berkeley) 6/6/93";
39: #else
1.8 ! deraadt 40: static char rcsid[] = "$OpenBSD: ttoutput.c,v 1.7 2004/03/16 01:11:09 tedu Exp $";
1.1 deraadt 41: #endif
42: #endif /* not lint */
43:
44: #include "ww.h"
45: #include "tt.h"
1.7 tedu 46: #include <errno.h>
1.6 david 47: #include <sys/types.h>
48: #include <string.h>
49: #include <unistd.h>
1.1 deraadt 50:
51: /*
52: * Buffered output package.
53: * We need this because stdio fails on non-blocking writes.
54: */
55:
56: ttflush()
57: {
1.4 mpech 58: char *p;
59: int n = tt_obp - tt_ob;
1.1 deraadt 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++;
1.8 ! deraadt 72: n = write(STDOUT_FILENO, p, tt_obp - p);
1.1 deraadt 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:
90: ttputs(s)
1.4 mpech 91: char *s;
1.1 deraadt 92: {
93: while (*s)
94: ttputc(*s++);
95: }
96:
97: ttwrite(s, n)
1.4 mpech 98: char *s;
99: int n;
1.1 deraadt 100: {
101: switch (n) {
102: case 0:
103: break;
104: case 1:
105: ttputc(*s);
106: break;
107: case 2:
108: if (tt_obe - tt_obp < 2)
109: ttflush();
110: *tt_obp++ = *s++;
111: *tt_obp++ = *s;
112: break;
113: case 3:
114: if (tt_obe - tt_obp < 3)
115: ttflush();
116: *tt_obp++ = *s++;
117: *tt_obp++ = *s++;
118: *tt_obp++ = *s;
119: break;
120: case 4:
121: if (tt_obe - tt_obp < 4)
122: ttflush();
123: *tt_obp++ = *s++;
124: *tt_obp++ = *s++;
125: *tt_obp++ = *s++;
126: *tt_obp++ = *s;
127: break;
128: case 5:
129: if (tt_obe - tt_obp < 5)
130: ttflush();
131: *tt_obp++ = *s++;
132: *tt_obp++ = *s++;
133: *tt_obp++ = *s++;
134: *tt_obp++ = *s++;
135: *tt_obp++ = *s;
136: break;
137: default:
138: while (n > 0) {
1.4 mpech 139: int m;
1.1 deraadt 140:
141: while ((m = tt_obe - tt_obp) == 0)
142: ttflush();
143: if ((m = tt_obe - tt_obp) > n)
144: m = n;
145: bcopy(s, tt_obp, m);
146: tt_obp += m;
147: s += m;
148: n -= m;
149: }
150: }
151: }
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