Merge branch 'feature/handle-quit-event'
[jumpnbump.git] / dos / interrpt.c
blob819ce7f2cf55de5c2f02f34b98037b051419456b
1 /*
2 * interrpt.h
3 * Copyright (C) 1998 Brainchild Design - http://brainchilddesign.com/
4 *
5 * Copyright (C) 2002 Florian Schulze - crow@icculus.org
7 * This file is part of Jump'n'Bump.
9 * Jump'n'Bump is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * Jump'n'Bump is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include "globals.h"
27 struct {
28 char enabled;
29 } keyb_handler_info;
31 volatile char keyb[256];
32 volatile char last_keys[50];
34 unsigned char scancode2ascii[256] = {
35 0, 0, 49, 50, 51, 52, 53, 54, 55, 56, /* 0-9 */
36 57, 48, 45, 0, 0, 0, 113, 119, 101, 114, /* 10-19 */
37 116, 121, 117, 105, 111, 112, 0, 0, 0, 0, /* 20-29 */
38 97, 115, 100, 102, 103, 104, 106, 107, 108, 0, /* 30-39 */
39 0, 0, 0, 0, 122, 120, 99, 118, 98, 110, /* 40-49 */
40 109, 44, 46, 47, 0, 0, 0, 32, 0, 0, /* 50-59 */
41 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
42 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
43 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
44 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
45 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
46 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
47 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
48 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
49 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
50 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
51 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
52 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
53 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
54 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
55 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
56 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
57 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
58 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
59 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
60 0, 0, 0, 0, 0, 0
63 _go32_dpmi_seginfo old_keyb_handler_seginfo, new_keyb_handler_seginfo;
66 void keyb_handler()
68 unsigned char key;
69 static char extended;
70 int c1;
72 key = inportb(0x60);
74 if (key == 0xe0)
75 extended = 1;
76 else {
77 if (extended == 0) {
78 if ((key & 0x80) == 0) {
79 keyb[key & 0x7f] = 1;
80 for (c1 = 48; c1 > 0; c1--)
81 last_keys[c1] = last_keys[c1 - 1];
82 last_keys[0] = scancode2ascii[key & 0x7f];
83 } else
84 keyb[key & 0x7f] = 0;
85 } else {
86 if ((key & 0x80) == 0) {
87 keyb[(key & 0x7f) + 0x80] = 1;
88 for (c1 = 48; c1 > 0; c1--)
89 last_keys[c1] = last_keys[c1 - 1];
90 last_keys[0] = scancode2ascii[(key & 0x7f) + 0x80];
91 } else
92 keyb[(key & 0x7f) + 0x80] = 0;
94 if (extended == 1)
95 extended = 0;
98 outportb(0x20, 0x20);
102 void keyb_handler_end()
107 char hook_keyb_handler(void)
110 if (keyb_handler_info.enabled == 0) {
111 _go32_dpmi_lock_data((char *) &keyb, sizeof(keyb));
112 _go32_dpmi_lock_code(keyb_handler, (unsigned long) keyb_handler_end - (unsigned long) keyb_handler);
113 _go32_dpmi_get_protected_mode_interrupt_vector(9, &old_keyb_handler_seginfo);
114 new_keyb_handler_seginfo.pm_offset = (int) keyb_handler;
115 if (_go32_dpmi_allocate_iret_wrapper(&new_keyb_handler_seginfo) != 0)
116 return 1;
117 if (_go32_dpmi_set_protected_mode_interrupt_vector(9, &new_keyb_handler_seginfo) != 0) {
118 _go32_dpmi_free_iret_wrapper(&new_keyb_handler_seginfo);
119 return 1;
121 keyb_handler_info.enabled = 1;
122 memset(last_keys, 0, sizeof(last_keys));
125 return 0;
130 void remove_keyb_handler(void)
133 if (keyb_handler_info.enabled == 1) {
134 _go32_dpmi_set_protected_mode_interrupt_vector(9, &old_keyb_handler_seginfo);
135 _go32_dpmi_free_iret_wrapper(&new_keyb_handler_seginfo);
136 keyb_handler_info.enabled = 0;
142 char key_pressed(unsigned char key)
145 return keyb[key];