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// code
char buffer[1024];
keyboardRead(buffer);
 
// keyboard.h
#ifndef __K_KEYBOARD_H__
#define __K_KEYBOARD_H__
 
#include <kernel.lib/assembly.h>
 
#define KEY_SHIFT 1
 
extern unsigned char keyChr;
 
extern void keyboardRead(char *buffer);
extern void keyboardClearKey();
extern void keyboardHandler(struct TRegisters *registers);
extern void keyboardInit();
 
#endif // __K_KEYBOARD_H__
 
// keyboard.c
#include <kernel.lib/hardware.h>
#include <kernel.lib/memory.h>
#include <kernel.lib/vga.h>
#include <kernel.sys/irq.h>
#include <kernel.sys/keyboard.h>
#include <kernel.sys/timer.h>
 
int keyboardScan = 0;
char *keyBuf;
unsigned short keyboardStatus = 0;
unsigned char keyboard[1][2][128] = {
  {
    {
         0,   27,  '1',  '2',  '3',  '4',  '5',  '6',  '7',  '8',  '9',  '0',  '-',
       '=', '\b', '\t',  'q',  'w',  'e',  'r',  't',  'y',  'u',  'i',  'o',  'p',
       '[',  ']', '\n',    0,  'a',  's',  'd',  'f',  'g',  'h',  'j',  'k',  'l',
       ';', '\'',  '`',    0, '\\',  'z',  'x',  'c',  'v',  'b',  'n',  'm',  ',',
       '.',  '/',    0,  '*',    0,  ' ',    0,    0,    0,    0,    0,    0,    0,
         0,    0,    0,    0,    0,    0,    0,    0,    0,  '-',    0,    0,    0,
       '+',    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0
    },
    {
         0,   27,  '!',  '@',  '#',  '$',  '%',  '^',  '&',  '*',  '(',  ')',  '_',
       '+', '\b', '\t',  'Q',  'W',  'E',  'R',  'T',  'Y',  'U',  'I',  'O',  'P',
       '{',  '}', '\n',    0,  'A',  'S',  'D',  'F',  'G',  'H',  'J',  'K',  'L',
       ':',  '"',  '~',    0,  '|',  'Z',  'X',  'C',  'V',  'B',  'N',  'M',  '<',
       '>',  '?',    0,  '*',    0,  ' ',    0,    0,    0,    0,    0,    0,    0,
         0,    0,    0,    0,    0,    0,    0,    0,    0,  '-',    0,    0,    0,
       '+',    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0
    }
  }
}, keyChr = '\0';
 
/**
 * keyboardRead - Starts reading to a user-specified buffer
 *     buffer   - Pointer to the buffer
 */
void keyboardRead(char *buffer) {
  keyboardScan = 1;
  keyBuf = buffer;
 
  while (keyboardScan == 1) {
  }
}
 
/**
 * keyboardHandler - Handles keypresses
 *     registers   - Registers at the time of the event
 */
void keyboardHandler(struct TRegisters *registers) {
  unsigned char scanCode;
 
  // Get rid of those nasty unused parameter warnings
  if (registers->intNumber == 1) { }
 
  // Read the byte from port 0x60
  scanCode = readB(0x60);
 
  if (scanCode == 42 || scanCode == 54) {
    keyboardStatus |= (1 << KEY_SHIFT);
  }
  if (scanCode == 42 + 128 || scanCode == 54 + 128) {
    keyboardStatus &= ~(1 << KEY_SHIFT);
  }
 
  if (keyboardStatus & (1 << KEY_SHIFT)) {
    keyChr = keyboard[0][1][scanCode];
    printChr(keyChr);
    if (keyboardScan == 1) {
      if (keyChr == '\n') {
        keyboardScan = 0;
      } else {
        *keyBuf++ = keyChr;
      }
    }
  } else {
    // Make sure that this isn't a released key!
    if (scanCode < 128) {
      keyChr = keyboard[0][0][scanCode];
      printChr(keyChr);
      if (keyboardScan == 1) {
        if (keyChr == '\n') {
          keyboardScan = 0;
        } else {
          *keyBuf++ = keyChr;
        }
      }
    }
  }
 
  writeB(0x20, 0x20);
}
 
/**
 * keyboardInit - Initializes the keyboard
 */
void keyboardInit() {
  irqInstall(1, keyboardHandler);
}

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while (keyboardScan == 1) { 
  }