KEY.C
上传用户:sycq158
上传日期:2008-10-22
资源大小:15361k
文件大小:2k
- /*
- file: KEY.C
- purpose:
- new keyboard interrupt handler and various keyboard routines
- based on code from ZKEY.ASM
- date: 11/4/95
- note:
- the key interrupts are not passed down or "chained" to the previous
- interrupt handler.
- */
- #include<f:smbkey.h>
- #include<f:smbxlib.h>
- #include<f:smbgamedefs.h>
- #define KEYBOARD_PORT 0x60
- #define KEYBOARD_XT_CLEAR 0x61
- void far interrupt new_int09_handler(void);
- void far interrupt (*old_int09_handler)();
- BYTER far *keybuf;
- static int new_key_handler_installed = FALSE;
- void install_new_key_handler(void)
- {
- keybuf = farmalloc(KEY_WAS_PRESSED * 2);
- clear_key_buffer();
- old_int09_handler = getvect(9);
- setvect(9, new_int09_handler);
- new_key_handler_installed = TRUE;
- }
- void far interrupt new_int09_handler(void)
- {
- BYTER scan_code;
- BYTER temp;
- /* read scan code */
- scan_code = inportb(KEYBOARD_PORT);
- /* clear keyboard controller on XT machines */
- temp = inportb(KEYBOARD_XT_CLEAR);
- outportb(KEYBOARD_XT_CLEAR, temp | 0x80);
- outportb(KEYBOARD_XT_CLEAR, temp & 0x7F);
- if (scan_code & 0x80) {
- /* key up */
- scan_code &= 0x7F;
- keybuf[scan_code] = 0;
- }
- else {
- /* key down */
- keybuf[scan_code] = 1;
- keybuf[KEY_WAS_PRESSED+scan_code] = 1;
- }
- outportb(PIC, NONSPECIFIC_EOI);
- }
- void clear_key_buffer(void)
- {
- int i;
- for (i = 0; i < KEY_WAS_PRESSED * 2; i++)
- keybuf[i] = 0;
- }
- void uninstall_new_key_handler(void)
- {
- if (new_key_handler_installed) {
- farfree(keybuf);
- setvect(9, old_int09_handler);
- }
- }