keyboard: Add new public functions

These will be used by future commits.

src/keyboard/inc/keyboard.h

@@ -29,6 +29,9 @@ void keyboard_update(struct keyboard *k);
 bool keyboard_justpressed(const struct keyboard *k, const struct keyboard_combo *c);
 bool keyboard_pressed(const struct keyboard *k, const struct keyboard_combo *c);
 bool keyboard_justreleased(const struct keyboard *k, const struct keyboard_combo *c);
+bool keyboard_any_justpressed(const struct keyboard *k, struct keyboard_combo *c);
+bool keyboard_any_pressed(const struct keyboard *k, struct keyboard_combo *c);
+char keyboard_to_char(const struct keyboard *k, enum keyboard_key key);
 const char *keyboard_key_str(enum keyboard_key k);
 
 #ifdef __cplusplus

src/keyboard/src/keyboard.c

@@ -1,8 +1,88 @@
 #include <keyboard.h>
 #include <keyboard_key.h>
 #include <stdbool.h>
+#include <stddef.h>
 #include <string.h>
 
+bool keyboard_any_justpressed(const struct keyboard *const k,
+    struct keyboard_combo *const c)
+{
+    bool ret = false;
+
+    for (size_t i = 0; i < sizeof c->keys / sizeof c->keys; i++)
+        c->keys[i] = KEYBOARD_KEY_NONE;
+
+    for (size_t i = 0, j = 0;
+        i < sizeof k->combo.keys / sizeof *k->combo.keys; i++)
+    {
+        const enum keyboard_key key = k->combo.keys[i];
+
+        if (key != KEYBOARD_KEY_NONE
+            && k->oldcombo.keys[i] == KEYBOARD_KEY_NONE)
+        {
+            c->keys[j++] = key;
+            ret = true;
+        }
+    }
+
+    return ret;
+}
+
+bool keyboard_any_pressed(const struct keyboard *const k,
+    struct keyboard_combo *const c)
+{
+    for (size_t i = 0; i < sizeof k->combo.keys / sizeof *k->combo.keys; i++)
+    {
+        const enum keyboard_key key = k->combo.keys[i];
+
+        if (key != KEYBOARD_KEY_NONE)
+        {
+            *c = k->combo;
+            return true;
+        }
+    }
+
+    return false;
+}
+
+char keyboard_to_char(const struct keyboard *const k,
+    const enum keyboard_key key)
+{
+    if (key >= KEYBOARD_KEY_0 && key <= KEYBOARD_KEY_9)
+        return '0' + key - KEYBOARD_KEY_0;
+    else if (key >= KEYBOARD_KEY_A && key <= KEYBOARD_KEY_Z)
+    {
+        if (keyboard_pressed(k, &KEYBOARD_COMBO(KEYBOARD_KEY_LSHIFT))
+            || keyboard_pressed(k, &KEYBOARD_COMBO(KEYBOARD_KEY_RSHIFT)))
+            return 'A' + key - KEYBOARD_KEY_A;
+        else
+            return 'a' + key - KEYBOARD_KEY_A;
+    }
+    else
+    {
+        static const struct map
+        {
+            enum keyboard_key key;
+            char ch;
+        } map[] =
+        {
+            {.key = KEYBOARD_KEY_DOT, .ch = '.'},
+            {.key = KEYBOARD_KEY_SPACE, .ch = ' '},
+            {.key = KEYBOARD_KEY_MINUS, .ch = '-'}
+        };
+
+        for (size_t i = 0; i < sizeof map / sizeof *map; i++)
+        {
+            const struct map *const m = &map[i];
+
+            if (key == m->key)
+                return m->ch;
+        }
+    }
+
+    return -1;
+}
+
 static bool combo_pressed(const struct keyboard_combo *const ref,
         const struct keyboard_combo *const c)
 {