52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
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#include "types.h"
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#include "x86.h"
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#include "defs.h"
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#include "kbd.h"
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int kbdgetc(void) {
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static uint shift;
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static uchar *charcode[4] = {
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normalmap, shiftmap, ctlmap, ctlmap
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};
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uint st, data, c;
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st = inb(KBSTATP);
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if ((st & KBS_DIB) == 0) {
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return -1;
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}
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data = inb(KBDATAP);
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if (data == 0xE0) {
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shift |= E0ESC;
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return 0;
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}
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else if (data & 0x80) {
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// Key released
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data = (shift & E0ESC ? data : data & 0x7F);
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shift &= ~(shiftcode[data] | E0ESC);
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return 0;
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}
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else if (shift & E0ESC) {
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// Last character was an E0 escape; or with 0x80
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data |= 0x80;
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shift &= ~E0ESC;
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}
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shift |= shiftcode[data];
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shift ^= togglecode[data];
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c = charcode[shift & (CTL | SHIFT)][data];
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if (shift & CAPSLOCK) {
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if ('a' <= c && c <= 'z') {
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c += 'A' - 'a';
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}
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else if ('A' <= c && c <= 'Z') {
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c += 'a' - 'A';
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}
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}
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return c;
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}
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void kbdintr(void) {
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consoleintr(kbdgetc);
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}
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