From 1f844d6a353527864a26befeb1bc689a3787aa6d Mon Sep 17 00:00:00 2001
From: Mathieu Maret <mathieu.maret@gmail.com>
Date: Tue, 21 Mar 2023 22:40:10 +0100
Subject: [PATCH] keyboard: add alt modifier

---
 drivers/keyboard.c | 139 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)

diff --git a/drivers/keyboard.c b/drivers/keyboard.c
index bda6b27..86e5915 100644
--- a/drivers/keyboard.c
+++ b/drivers/keyboard.c
@@ -144,6 +144,135 @@ const char *scancode[128] = {
     /* 126 */ 0,
     /* 127 */ 0};
 
+const char *scancode_alt[128] = {
+    /* 0 */ 0,
+    /* 1 */ "\e",
+    /* 2 */ "1",
+    /* 3 */ "~",
+    /* 4 */ "#",
+    /* 5 */ "{",
+    /* 6 */ "[",
+    /* 7 */ "|",
+    /* 8 */ "`",
+    /* 9 */ "\\",
+    /* 10 */ "^",
+    /* 11 */ "@",
+    /* 12 */ "]",
+    /* 13 */ "}",
+    /* 14 */ "\b",   /* Shift-Backspace */
+    /* 15 */ "\e[Z", /* Shift-Tab */
+    /* 16 */ "A",
+    /* 17 */ "Z",
+    /* 18 */ "E",
+    /* 19 */ "R",
+    /* 20 */ "T",
+    /* 21 */ "Y",
+    /* 22 */ "U",
+    /* 23 */ "I",
+    /* 24 */ "O",
+    /* 25 */ "P",
+    /* 26 */ "\"",
+    /* 27 */ "£",
+    /* 28 */ "\n",
+    /* 29 */ 0, /* left control */
+    /* 30 */ "Q",
+    /* 31 */ "S",
+    /* 32 */ "D",
+    /* 33 */ "F",
+    /* 34 */ "G",
+    /* 35 */ "H",
+    /* 36 */ "J",
+    /* 37 */ "K",
+    /* 38 */ "L",
+    /* 39 */ "M",
+    /* 40 */ "%",
+    /* 41 */ 0,
+    /* 42 */ 0,
+    /* 43 */ "µ",
+    /* 44 */ "W",
+    /* 45 */ "X",
+    /* 46 */ "C",
+    /* 47 */ "V",
+    /* 48 */ "B",
+    /* 49 */ "N",
+    /* 50 */ "?",
+    /* 51 */ ".",
+    /* 52 */ "/",
+    /* 53 */ "§",
+    /* 54 */ 0,
+    /* 55 */ 0,
+    /* 56 */ 0,
+    /* 57 */ 0,
+    /* 58 */ 0,
+    /* 59 */ "\eOP",     /* Shift-F1 */
+    /* 60 */ "\eOQ",     /* Shift-F2 */
+    /* 61 */ "\eOR",     /* Shift-F3 */
+    /* 62 */ "\eOS",     /* Shift-F4 */
+    /* 63 */ "\e[15;2~", /* Shift-F5 */
+    /* 64 */ "\e[17;2~", /* Shift-F6 */
+    /* 65 */ "\e[18;2~", /* Shift-F7 */
+    /* 66 */ "\e[19;2~", /* Shift-F8 */
+    /* 67 */ "\e[20:2~", /* Shift-F9 */
+    /* 68 */ "\e[21:2~", /* Shift-F10 */
+    /* 69 */ 0,
+    /* 70 */ 0,
+    /* 71 */ 0,
+    /* 72 */ 0,
+    /* 73 */ 0,
+    /* 74 */ 0,
+    /* 75 */ 0,
+    /* 76 */ 0,
+    /* 77 */ 0,
+    /* 78 */ 0,
+    /* 79 */ 0,
+    /* 80 */ 0,
+    /* 81 */ 0,
+    /* 82 */ 0,
+    /* 83 */ 0,
+    /* 84 */ 0,
+    /* 85 */ 0,
+    /* 86 */ ">",
+    /* 87 */ "\e[23;2~", /* Shift-F11 */
+    /* 88 */ "\e[24;2~", /* Shift-F12 */
+    /* 89 */ 0,
+    /* 90 */ 0,
+    /* 91 */ 0,
+    /* 92 */ 0,
+    /* 93 */ 0,
+    /* 94 */ 0,
+    /* 95 */ 0,
+    /* 96 */ 0,
+    /* 97 */ 0,
+    /* 98 */ 0,
+    /* 99 */ 0,
+    /* 100 */ 0,
+    /* 101 */ 0,
+    /* 102 */ 0,
+    /* 103 */ 0,
+    /* 104 */ 0,
+    /* 105 */ 0,
+    /* 106 */ 0,
+    /* 107 */ 0,
+    /* 108 */ 0,
+    /* 109 */ 0,
+    /* 110 */ 0,
+    /* 111 */ 0,
+    /* 112 */ 0,
+    /* 113 */ 0,
+    /* 114 */ 0,
+    /* 115 */ 0,
+    /* 116 */ 0,
+    /* 117 */ 0,
+    /* 118 */ 0,
+    /* 119 */ 0,
+    /* 120 */ 0,
+    /* 121 */ 0,
+    /* 122 */ 0,
+    /* 123 */ 0,
+    /* 124 */ 0,
+    /* 125 */ 0,
+    /* 126 */ 0,
+    /* 127 */ 0};
 const char *scancode_shift[128] = {
     /* 0 */ 0,
     /* 1 */ "\e",
@@ -279,6 +408,7 @@ void keyboard_do_irq()
     static int lshift   = 0;
     static int rshift   = 0;
     static int capslock = 0;
+    static int alt      = 0;
     static int isExt    = 0;
     unsigned char c     = inb(KEYBOARD_DATA_PORT);
     const char *key     = NULL;
@@ -298,12 +428,17 @@ void keyboard_do_irq()
                 case 54:
                     rshift = 1;
                     break;
+                case 56:
+                    alt = 1;
+                    break;
                 case 58:
                     capslock = 1 - capslock;
                     break;
                 default:
                     if ((lshift || rshift) ^ capslock) {
                         key = scancode_shift[(int)c];
+                    } else if (alt) {
+                        key = scancode_alt[(int)c];
                     } else {
                         key = scancode[(int)c];
                     }
@@ -316,6 +451,10 @@ void keyboard_do_irq()
                     break;
                 case 54:
                     rshift = 0;
+                    break;
+                case 56:
+                    alt = 0;
+                    break;
             }
         }
     }