summaryrefslogtreecommitdiff
path: root/payloads/libpayload/curses/keyboard.c
blob: cfb7b769d72be2341ecfb56c13386345bae213a6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
/*
 * This file is part of the libpayload project.
 *
 * Copyright (C) 2007 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2008 Advanced Micro Devices, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * This file handles reading keystrokes from serial and the console
 * and "cooking" them so that they are correct for curses.
 * Also, implement key related functions (mainly wgetch)
 *
 * TODO:
 * Actually cook the serial (handle special keys)
 */

#include <config.h>
#include "local.h"

static int _halfdelay = 0;

/* ============== Serial ==================== */

/* We treat serial like a vt100 terminal.  For now we
   do the cooking in here, but we should probably eventually
   pass it to dedicated vt100 code */

static int getkeyseq(char *buffer, int len)
{
	int i;

	for(i = 0; i < 75; i++) {
		if (serial_havechar())
			break;
		mdelay(1);
	}

	if (i == 75)
		return len;

	buffer[len++] = serial_getchar();
	return getkeyseq(buffer, len);
}

static struct {
	char *seq;
	int key;
} escape_codes[] = {
	{ "[A", KEY_UP },
	{ "[B", KEY_DOWN },
	{ "[C", KEY_RIGHT },
	{ "[D", KEY_LEFT },
	{ "[F", KEY_END },
	{ "[H", KEY_HOME },
	{ "[2~", KEY_IC },
	{ "[3~", KEY_DC },
	{ "[5~", KEY_PPAGE },
	{ "[6~", KEY_NPAGE },
	{ "OP", KEY_F(1) },
	{ "OQ", KEY_F(2) },
	{ "OR", KEY_F(3) },
	{ "OS", KEY_F(4) },
	{ "[15~", KEY_F(5) },
	{ "[17~", KEY_F(6) },
	{ "[18~", KEY_F(7) },
	{ "[19~", KEY_F(8) },
	{ "[20~", KEY_F(9) },
	{ "[21~", KEY_F(10) },
	{ "[23~", KEY_F(11) },
	{ "[24~", KEY_F(12) },
	{ NULL },
};

static int handle_escape(void)
{
	char buffer[5];
	int len = getkeyseq(buffer, 0);
	int i, t;

	if (len == 0)
		return 27;

	for(i = 0; escape_codes[i].seq != NULL; i++) {
		char *p = escape_codes[i].seq;

		for(t = 0; t < len; t++) {
			if (!*p || *p != buffer[t])
				break;
			p++;
		}

		if (t == len)
			return escape_codes[i].key;
	}

	return 0;
}

static int cook_serial(unsigned char ch)
{
	switch(ch) {
	case 8:
		return KEY_BACKSPACE;

	case 13:
		return KEY_ENTER;

	case 27:
		return handle_escape();

	default:
		return ch;
	}
}

/* ================ Keyboard ================ */

static int curses_getchar(int delay)
{
	unsigned short c;

	do {
#ifdef CONFIG_PC_KEYBOARD
		if ((curses_flags & F_ENABLE_CONSOLE) &&
		    keyboard_havechar()) {
			c = keyboard_getchar();
			if (c != 0) return c;
		}
#endif

#ifdef CONFIG_SERIAL_CONSOLE
		if ((curses_flags & F_ENABLE_SERIAL) &&
		    serial_havechar()) {
			c = serial_getchar();
			return cook_serial(c);
		}
#endif

		if (delay == 0)
			break;

		if (delay > 0) {
			mdelay(100);
			delay--;
		}


	} while (1);

	return ERR;
}

/* === Public functions === */

int wgetch(WINDOW *win)
{
	int delay = -1;

	if (_halfdelay || win->_delay)
		delay = win->_delay ? 0 : _halfdelay;

	return curses_getchar(delay);
}

int nodelay(WINDOW *win, NCURSES_BOOL flag)
{
	win->_delay = flag ? 1 : 0;
	return 0;
}

int halfdelay(int tenths)
{
	if (tenths > 255)
		return ERR;

	_halfdelay = tenths;
	return 0;
}

int nocbreak(void)
{
	/* Remove half delay timeout. */
	_halfdelay = 0;
	return 0;
}

#ifdef CONFIG_VGA_CONSOLE
void curses_enable_vga(int state)
{
	if (state)
		curses_flags |= F_ENABLE_CONSOLE;
	else
		curses_flags &= ~F_ENABLE_CONSOLE;
}
#else
void curses_enable_vga(int state) { }
#endif

#ifdef CONFIG_SERIAL_CONSOLE
void curses_enable_serial(int state)
{
	if (state)
		curses_flags |= F_ENABLE_SERIAL;
	else
		curses_flags &= ~F_ENABLE_SERIAL;
}
#else
void curses_enable_serial(int state) { }
#endif