Annotation of src/usr.bin/window/ttoutput.c, Revision 1.6
1.6 ! david 1: /* $OpenBSD: ttoutput.c,v 1.5 2003/06/03 02:56:23 millert 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
1.6 ! david 40: static char rcsid[] = "$OpenBSD: ttoutput.c,v 1.5 2003/06/03 02:56:23 millert Exp $";
1.1 deraadt 41: #endif
42: #endif /* not lint */
43:
44: #include "ww.h"
45: #include "tt.h"
46: #include <sys/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: 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)
1.4 mpech 92: char *s;
1.1 deraadt 93: {
94: while (*s)
95: ttputc(*s++);
96: }
97:
98: ttwrite(s, n)
1.4 mpech 99: char *s;
100: int n;
1.1 deraadt 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) {
1.4 mpech 140: int m;
1.1 deraadt 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: }