From bce944d1498eaa3b6940ee234c863b3548a66b37 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji6283@gmail.com>
Date: Sun, 24 Jan 2021 12:00:11 -0500
Subject: graphics!

---
 src/user/knob/key.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 src/user/knob/key.c

(limited to 'src/user/knob/key.c')

diff --git a/src/user/knob/key.c b/src/user/knob/key.c
new file mode 100644
index 0000000..1506f3b
--- /dev/null
+++ b/src/user/knob/key.c
@@ -0,0 +1,67 @@
+#include <keypack.h>
+
+static const char no_mod[] = {
+   0,   0,   0,   0,   0,   0,   0,   0,   0, '\t','\n',  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', '1', '2', '3', '4', '5', '6', '7', '8', '9',  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,
+  '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
+  'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',  0,   0,   0,   0,   0
+};
+
+static const char shifted[] = {
+   0,   0,   0,   0,   0,   0,   0,   0,   0, '\t','\n',  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,  '<', '_', '>', '?',
+  ')', '!', '@', '#', '$', '%', '^', '&', '*', '(',  0,  ':',  0,  '+',  0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,  '{', '|', '}',  0,   0,
+  '~', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
+  'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',  0,   0,   0,   0,   0
+};
+
+static const char caps[] = {
+   0,   0,   0,   0,   0,   0,   0,   0,   0, '\t','\n',  0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+  ' ',  0,   0,   0,   0,   0,   0, '\'',  0,   0,   0,   0,  ',', '-', '.', '/',
+  '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',  0,  ';',  0,  '=',  0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,  '[','\\', ']',  0,   0,
+  '`', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
+  'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',  0,   0,   0,   0,   0
+};
+
+static const char sh_caps[] = {
+   0,   0,   0,   0,   0,   0,   0,   0,   0, '\t','\n',  0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+  ' ',  0,   0,   0,   0,   0,   0,  '"',  0,   0,   0,   0,  '<', '_', '>', '?',
+  ')', '!', '@', '#', '$', '%', '^', '&', '*', '(',  0,  ':',  0,  '+',  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,
+  '~', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
+  'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',  0,   0,   0,   0,   0
+};
+
+static const char num[] = {
+  '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '*', '+', '\n', '-', '.', '/'
+};
+
+__attribute__ ((pure))
+char key_to_char(struct key_packet kp) {
+  if (kp.key_id < 0x80) {
+    const char ch = (kp.modifiers & SHIFTS
+               ? kp.modifiers & CAPS
+                 ? sh_caps : shifted
+               : kp.modifiers & CAPS
+                 ? caps : no_mod)[kp.key_id];
+    return ch ? kp.modifiers & ALTS ? 0x80 & ch : ch : 0;
+  }
+
+  else if ((kp.modifiers & NUM) && ((kp.key_id & 0xf0) == 0xb0))
+    return num[kp.key_id & 0x0f];
+
+  else
+    return 0;
+}
\ No newline at end of file
-- 
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