keyboard.c revision 290001 
1/*
2 * Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 2000, 2001  Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18/* $Id: keyboard.c,v 1.13 2007/06/19 23:47:18 tbox Exp $ */
19
20#include <config.h>
21
22#include <sys/param.h>
23#include <sys/types.h>
24#include <sys/time.h>
25#include <sys/uio.h>
26
27#include <errno.h>
28#include <stdlib.h>
29#include <string.h>
30#include <termios.h>
31#include <unistd.h>
32#include <fcntl.h>
33
34#include <isc/keyboard.h>
35#include <isc/util.h>
36
37isc_result_t
38isc_keyboard_open(isc_keyboard_t *keyboard) {
39	int fd;
40	isc_result_t ret;
41	struct termios current_mode;
42
43	REQUIRE(keyboard != NULL);
44
45	fd = open("/dev/tty", O_RDONLY, 0);
46	if (fd < 0)
47		return (ISC_R_IOERROR);
48
49	keyboard->fd = fd;
50
51	if (tcgetattr(fd, &keyboard->saved_mode) < 0) {
52		ret = ISC_R_IOERROR;
53		goto errout;
54	}
55
56	current_mode = keyboard->saved_mode;
57
58	current_mode.c_iflag &=
59			~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
60	current_mode.c_oflag &= ~OPOST;
61	current_mode.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
62	current_mode.c_cflag &= ~(CSIZE|PARENB);
63	current_mode.c_cflag |= CS8;
64
65	current_mode.c_cc[VMIN] = 1;
66	current_mode.c_cc[VTIME] = 0;
67	if (tcsetattr(fd, TCSAFLUSH, &current_mode) < 0) {
68		ret = ISC_R_IOERROR;
69		goto errout;
70	}
71
72	keyboard->result = ISC_R_SUCCESS;
73
74	return (ISC_R_SUCCESS);
75
76 errout:
77	close (fd);
78
79	return (ret);
80}
81
82isc_result_t
83isc_keyboard_close(isc_keyboard_t *keyboard, unsigned int sleeptime) {
84	REQUIRE(keyboard != NULL);
85
86	if (sleeptime > 0 && keyboard->result != ISC_R_CANCELED)
87		(void)sleep(sleeptime);
88
89	(void)tcsetattr(keyboard->fd, TCSAFLUSH, &keyboard->saved_mode);
90	(void)close(keyboard->fd);
91
92	keyboard->fd = -1;
93
94	return (ISC_R_SUCCESS);
95}
96
97isc_result_t
98isc_keyboard_getchar(isc_keyboard_t *keyboard, unsigned char *cp) {
99	ssize_t cc;
100	unsigned char c;
101	cc_t *controlchars;
102
103	REQUIRE(keyboard != NULL);
104	REQUIRE(cp != NULL);
105
106	cc = read(keyboard->fd, &c, 1);
107	if (cc < 0) {
108		keyboard->result = ISC_R_IOERROR;
109		return (keyboard->result);
110	}
111
112	controlchars = keyboard->saved_mode.c_cc;
113	if (c == controlchars[VINTR] || c == controlchars[VQUIT]) {
114		keyboard->result = ISC_R_CANCELED;
115		return (keyboard->result);
116	}
117
118	*cp = c;
119
120	return (ISC_R_SUCCESS);
121}
122
123isc_boolean_t
124isc_keyboard_canceled(isc_keyboard_t *keyboard) {
125	return (ISC_TF(keyboard->result == ISC_R_CANCELED));
126}
127