feature (strings): implemented the noxos ascii extension

inc/drivers/ps2/scancodes.h

@@ -27,6 +27,10 @@
 #define PS2_SCANCODE_SET_1_F11              0x57
 #define PS2_SCANCODE_SET_1_F12              0x58
 
+#define PS2_SCANCODE_SET_1_E0_CURSOR_UP     0x48
+#define PS2_SCANCODE_SET_1_E0_CURSOR_LEFT   0x4B
+#define PS2_SCANCODE_SET_1_E0_CURSOR_RIGHT  0x4D
+#define PS2_SCANCODE_SET_1_E0_CURSOR_DOWN   0x50
 
 #define PS2_SCANCODE_SET_1_RELEASE          0x80
 #define PS2_SCANCODE_SET_1_MODIFIER         0xE0

inc/utils/string.h

@@ -6,12 +6,35 @@
 #include "stdtypes.h"
 #include <stdarg.h>
 
+#define STRING_EXT_SIZE(n) ((n) + 5)
+
 typedef const char* string_t;
 
+typedef enum {
+    STRING_EXT_CMD_CLEAR,
+    STRING_EXT_CMD_CURSOR_MOVE,
+    STRING_EXT_CMD_CURSOR_SET,
+    STRING_EXT_CMD_COLOR_SET,
+    STRING_EXT_CMD_COLOR_RESET,
+    STRING_EXT_CMD_RENDER_DISABLE,
+    STRING_EXT_CMD_RENDER_ENABLE,
+    STRING_EXT_CMD_KEYBOARD_ECHO
+} string_ext_command_E;
+
+typedef struct {
+    uint8_t     shift_in;
+    uint16_t    length;
+    uint8_t     command;
+    uint8_t     data;
+    // DATA BLOCKS
+    // SHIFT OUT
+}__attribute__((packed)) string_ext_header_T;
+
 uint32_t    string_length                   (string_t string);
 bool        string_compare                  (string_t a, string_t b);
 uint32_t    string_find_next                (string_t string, char chr);
 uint32_t    string_find_last                (string_t string, char chr);
+void        string_add_ext_command          (string_t string, string_ext_command_E command, int num_data, uint8_t data[]);
 
 uint64_t    variadic_format_size            (string_t string, va_list args);
 uint64_t    format_size                     (string_t string, ...);

ramdisk/shell.c

@@ -24,7 +24,7 @@ int read_command(char* command_buffer)  {
         }
     }
 
-    command_buffer[pos] = '\0';
+    command_buffer[--pos] = '\0';
     return pos;
 }
 

src/drivers/ps2/keyboard.c

@@ -61,14 +61,45 @@ void ps2_keyboard_init() {
     pic_unmask_irq(IRQ_KEYBOARD);
 }
 
+#include "utils/memory.h"
 void ps2_keyboard_read() {
     uint8_t scancode = ps2_controller_read_data();
-    char    chr [2]; chr[1] = '\0';
+    char    chr [8];
 
     if (extended_key) {
         extended_key = false;
+
+        switch (scancode) {
+            case PS2_SCANCODE_SET_1_E0_CURSOR_LEFT: {
+                uint8_t data = 0;
+                string_add_ext_command(chr, STRING_EXT_CMD_CURSOR_MOVE, 1, &data);
+                chr[STRING_EXT_SIZE(1)+1] = '\0';
+                break;
+            }
+            case PS2_SCANCODE_SET_1_E0_CURSOR_RIGHT: {
+                uint8_t data = 1;
+                string_add_ext_command(chr, STRING_EXT_CMD_CURSOR_MOVE, 1, &data);
+                chr[STRING_EXT_SIZE(1)+1] = '\0';
+                break;
+            }
+            case PS2_SCANCODE_SET_1_E0_CURSOR_UP: {
+                uint8_t data = 2;
+                string_add_ext_command(chr, STRING_EXT_CMD_CURSOR_MOVE, 1, &data);
+                chr[STRING_EXT_SIZE(1)+1] = '\0';
+                break;
+            }
+            case PS2_SCANCODE_SET_1_E0_CURSOR_DOWN: {
+                uint8_t data = 3;
+                string_add_ext_command(chr, STRING_EXT_CMD_CURSOR_MOVE, 1, &data);
+                chr[STRING_EXT_SIZE(1)+1] = '\0';
+                break;
+            }
+            default: {
                 return;
             }
+        }
+        memory_hexdump(chr, 8);
+    }
 
     if (scancode == PS2_SCANCODE_SET_1_MODIFIER) {
         extended_key = true;
@@ -111,16 +142,19 @@ void ps2_keyboard_read() {
 
         case PS2_SCANCODE_SET_1_BACKSPACE: {
             chr[0] = '\b';
+            chr[1] = '\0';
             break;
         }
 
         case PS2_SCANCODE_SET_1_SPACE: {
             chr[0] = ' ';
+            chr[1] = '\0';
             break;
         }
 
         case PS2_SCANCODE_SET_1_RETURN: {
             chr[0] = '\n';
+            chr[1] = '\0';
             break;
         }
 
@@ -137,6 +171,7 @@ void ps2_keyboard_read() {
                 if (string_is_char_lowercase(chr[0]))      chr[0] -= 32;
                 else if (string_is_char_uppercase(chr[0])) chr[0] += 32;
             }
+            chr[1] = '\0';
             break;
         }
     }

src/utils/string.c

@@ -42,6 +42,15 @@ uint32_t string_find_last(string_t string, char chr) {
     return n;
 }
 
+void string_add_ext_command(string_t string, string_ext_command_E command, int num_data, uint8_t data[]) {
+    string_ext_header_T* header = (string_ext_header_T*)string;
+    header->shift_in = 0x0F;
+    header->length   = num_data;
+    header->command  = command;
+    memory_copy(data, &header->data, num_data);
+    *(&(&header->data)[num_data]) = 0x0E;
+}
+
 uint64_t variadic_format_size(string_t string, va_list args) {
     const char* buffer_in = (const char*)string;