1 files changed, 182 insertions, 0 deletions
diff --git a/include/06.keyboard/keyboard.c b/include/06.keyboard/keyboard.c
new file mode 100644
index 0000000..2218f09
--- /dev/null
+++ b/include/06.keyboard/keyboard.c
@@ -0,0 +1,182 @@
+#include<types.h>
+#include<asm.h>
+#include<stdio.h>
+
+#define BUFFER_SIZE 200
+#define BUFFER_LOG 200
+char buffer[BUFFER_LOG][BUFFER_SIZE];
+size_t buffer_size[BUFFER_LOG];
+size_t buffer_current=0;
+size_t buffer_all=0;
+size_t buffer_index=0;
+
+#define PIC1_COMMAND_PORT 0x20
+#define PIC1_DATA_PORT 0x21
+#define PIC2_COMMAND_PORT 0xA0
+#define PIC2_DATA_PORT 0xA1
+// IO Ports for Keyboard
+#define KEYBOARD_DATA_PORT 0x60
+#define KEYBOARD_STATUS_PORT 0x64
+
+void previous_field(void);
+void tty(char *buffer);
+void prompt(void);
+void clear();
+void us_en(char keymap[]);
+void us_en_shift(char keymap[]);
+
+char charcode[256];
+char shift_charcode[256];
+bool ispressed[128];
+#define lshift 0x2A
+#define rshift 0x36
+#define lctrl 0x1D
+#define rctrl 0x1D
+
+void init_keyboard()
+{
+    us_en(charcode);
+    us_en_shift(shift_charcode);
+}
+
+void deletelast()
+{
+    previous_field();
+    printf(" ");
+    previous_field();
+}
+
+void backspace()
+{
+    if(buffer_index<=0) return;
+
+    deletelast();
+    buffer[buffer_current][--buffer_index]='\0';
+    return;
+}
+
+void enter()
+{
+    printf("\n");
+    if(buffer_index>0)
+    {
+        tty(buffer[buffer_current]);
+        buffer_size[buffer_current]=buffer_index;
+        if(buffer_current==buffer_all) buffer_current=(++buffer_all);
+        else
+        {
+            for(size_t i=0;i<BUFFER_SIZE;i++) buffer[buffer_all][i]='\0';
+            buffer_current=buffer_all;
+        }
+        buffer_index=0;
+    }
+    prompt();
+    return;
+}
+
+void space()
+{
+    buffer[buffer_current][buffer_index++]=' ';
+    printf(" ");
+}
+
+void keyup()
+{
+    if(buffer_current>0)
+    {
+        buffer_size[buffer_current]=buffer_index;
+        for(size_t i=0;i<buffer_index;i++) deletelast();
+        buffer_current--;
+        buffer_index=buffer_size[buffer_current];
+        printf("%s",buffer[buffer_current]);
+    }
+}
+
+void keydown()
+{
+    if(buffer_current<buffer_all)
+    {
+        buffer_size[buffer_current]=buffer_index;
+        for(size_t i=0;i<buffer_index;i++) deletelast();
+        buffer_current++;
+        buffer_index=buffer_size[buffer_current];
+        printf("%s",buffer[buffer_current]);
+    }
+}
+
+void keyleft()
+{
+}
+
+void keyright()
+{
+}
+
+void keyboard_handler()
+{
+    ioport_out(PIC1_COMMAND_PORT, 0x20);
+    uint8_t status = ioport_in(KEYBOARD_STATUS_PORT);
+
+    if (status & 0x1)
+    {
+        uint8_t keycode = ioport_in(KEYBOARD_DATA_PORT);
+        if(keycode<0x80)
+        {
+            char c=charcode[keycode];
+            ispressed[keycode]=1;
+            // printf("%d ",&keycode);
+
+            switch(keycode)
+            {
+                case 0x0E:
+                    backspace();
+                    break;
+                case 0x1C:
+                    enter();
+                    break;
+                case 0x39:
+                    space();
+                    break;
+                case 72:
+                    keyup();
+                    break;
+                case 80:
+                    keydown();
+                    break;
+                case 75:
+                    keyleft();
+                    break;
+                case 77:
+                    keyright();
+                    break;
+
+                default:
+                    if(c!=' ')
+                    {
+                        if(ispressed[lctrl]||ispressed[rctrl])
+                        {
+                            if(c=='l')
+                            {
+                                clear();
+                                prompt();
+                                printf("%s",buffer[buffer_current]);
+                                return;
+                            }
+                        }
+                        if(ispressed[lshift]||ispressed[rshift])
+                        {
+                            c=shift_charcode[keycode];
+                        }
+                        buffer[buffer_current][buffer_index++]=c;
+                        printf("%c",c);
+                    }
+                    break;
+            }
+
+        }
+        else
+        {
+            ispressed[keycode-0x80]=0;
+        }
+    }
+}