Annotation of sys/lib/libsa/cons.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: cons.c,v 1.11 2003/08/11 06:23:09 deraadt Exp $ */
2:
3: /*
4: * Copyright (c) 1988 University of Utah.
5: * Copyright (c) 1990, 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: * the Systems Programming Group of the University of Utah Computer
10: * Science Department.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: *
36: * form: OpenBSD: cons.c,v 1.7 1996/04/21 22:19:48
37: * from: OpenBSD: cninit.c,v 1.2 1996/03/30 02:03:45
38: * from: Utah $Hdr: cons.c 1.7 92/01/21$
39: *
40: * @(#)cons.c 8.2 (Berkeley) 1/12/94
41: */
42:
43: #include <sys/param.h>
44: #include "stand.h"
45: #include <dev/cons.h>
46:
47: void
48: cninit(void)
49: {
50: struct consdev *cp;
51:
52: /*
53: * Collect information about all possible consoles
54: * and find the one with highest priority
55: */
56: for (cp = constab; cp->cn_probe; cp++) {
57: (*cp->cn_probe)(cp);
58: if (cp->cn_pri > CN_DEAD &&
59: (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
60: cn_tab = cp;
61: }
62: /*
63: * No console, we can handle it
64: */
65: if ((cp = cn_tab) == NULL)
66: return;
67: /*
68: * Turn on console
69: */
70: (*cp->cn_init)(cp);
71: }
72:
73: int
74: cnset(dev_t dev)
75: {
76: struct consdev *cp;
77:
78: /*
79: * Look for the specified console device and use it.
80: */
81: for (cp = constab; cp->cn_probe; cp++) {
82: if (major(cp->cn_dev) == major(dev)) {
83: /* short-circuit noop */
84: if (cp == cn_tab && cp->cn_dev == dev)
85: return (0);
86: if (cp->cn_pri > CN_DEAD) {
87: cn_tab = cp;
88: cp->cn_dev = dev;
89: /* Turn it on. */
90: (cp->cn_init)(cp);
91: return (0);
92: }
93: break;
94: }
95: }
96: return (1);
97: }
98:
99: int
100: cngetc(void)
101: {
102: if (cn_tab == NULL)
103: return (0);
104: return ((*cn_tab->cn_getc)(cn_tab->cn_dev));
105: }
106:
107: void
108: cnputc(int c)
109: {
110: if (cn_tab != NULL && c) {
111: (*cn_tab->cn_putc)(cn_tab->cn_dev, c);
112: if (c == '\n')
113: (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
114: }
115: }
116:
117: int
118: cnischar(void)
119: {
120: if (cn_tab != NULL)
121: return ((*cn_tab->cn_getc)(cn_tab->cn_dev|0x80));
122: return 0;
123: }
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