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1 /*
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2 Copyright 2004-2012 John Tsiombikas <nuclear@member.fsf.org>
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3
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4 This file is part of gbasys, a library for GameBoy Advance development.
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5
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6 This program is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 */
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20
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21 #include <stdlib.h>
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22 #include "term.h"
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23 #include "input.h"
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24 #include "signal.h"
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25 #include "intr.h"
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26
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27 static struct key_node *key_queue, *key_queue_tail;
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28
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29 static void key_handler(void);
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30
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31 void term_init(void) {
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32 mask(INTR_KEY);
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33 interrupt(INTR_KEY, key_handler);
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34 unmask(INTR_KEY);
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35
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36 key_queue = malloc(sizeof *key_queue);
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37 key_queue->next = 0;
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38 key_queue_tail = key_queue;
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39 }
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40
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41 static void noop(int sig) {}
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42
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43 int gba_getc(FILE *fp) {
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44 struct key_node *tmp;
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45 int c;
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46
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47 if(fp != stdin) panic("getc: only stdin valid");
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48
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49 save_signal(SIGIO);
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50 signal(SIGIO, noop);
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51 while(!key_queue->next) pause();
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52 restore_signal(SIGIO);
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53
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54 tmp = key_queue;
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55 key_queue = key_queue->next;
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56 free(tmp);
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57 return key_queue->key;
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58 }
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59
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60 static void key_handler(void) {
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61 int i, state;
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62 static unsigned long prev;
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63 unsigned long time;
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64
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65 time = get_millisec();
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66 if(time - prev < 100) return;
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67 prev = time;
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68
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69 state = get_key_state(KEY_ALL);
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70 for(i=0; i<KEY_COUNT; i++) {
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71 int bit = (1 << i);
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72 if(state & bit) {
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73 struct key_node *key = malloc(sizeof *key);
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74 key->key = bit;
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75 key->next = 0;
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76 key_queue_tail->next = key;
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77 key_queue_tail = key;
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78 }
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79 }
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80 raise(SIGIO);
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81 }
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