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#include "locale.h"
#include "hashtable.h"
#include <Carbon/Carbon.h>
#include <IOKit/hidsystem/ev_keymap.h>
#define internal static
internal struct table keymap_table;
internal char *
copy_cfstring(CFStringRef string)
{
CFStringEncoding encoding = kCFStringEncodingUTF8;
CFIndex length = CFStringGetLength(string);
CFIndex bytes = CFStringGetMaximumSizeForEncoding(length, encoding);
char *result = malloc(bytes + 1);
// NOTE(koekeishiya): Boolean: typedef -> unsigned char; false = 0, true != 0
Boolean success = CFStringGetCString(string, result, bytes + 1, encoding);
if (!success) {
free(result);
result = NULL;
}
return result;
}
internal int
hash_keymap(const char *a)
{
unsigned long hash = 0, high;
while (*a) {
hash = (hash << 4) + *a++;
high = hash & 0xF0000000;
if (high) {
hash ^= (high >> 24);
}
hash &= ~high;
}
return hash;
}
internal bool
same_keymap(const char *a, const char *b)
{
while (*a && *b && *a == *b) {
++a;
++b;
}
return *a == '\0' && *b == '\0';
}
internal CFStringRef
cfstring_from_keycode(UCKeyboardLayout *keyboard_layout, CGKeyCode keycode)
{
UInt32 dead_key_state = 0;
UniCharCount max_string_length = 255;
UniCharCount string_length = 0;
UniChar unicode_string[max_string_length];
OSStatus status = UCKeyTranslate(keyboard_layout, keycode,
kUCKeyActionDown, 0,
LMGetKbdType(), 0,
&dead_key_state,
max_string_length,
&string_length,
unicode_string);
if (string_length == 0 && dead_key_state) {
status = UCKeyTranslate(keyboard_layout, kVK_Space,
kUCKeyActionDown, 0,
LMGetKbdType(), 0,
&dead_key_state,
max_string_length,
&string_length,
unicode_string);
}
if (string_length > 0 && status == noErr) {
return CFStringCreateWithCharacters(NULL, unicode_string, string_length);
}
return NULL;
}
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wint-to-void-pointer-cast"
bool initialize_keycode_map()
{
TISInputSourceRef keyboard = TISCopyCurrentASCIICapableKeyboardLayoutInputSource();
CFDataRef uchr = (CFDataRef) TISGetInputSourceProperty(keyboard, kTISPropertyUnicodeKeyLayoutData);
CFRelease(keyboard);
UCKeyboardLayout *keyboard_layout = (UCKeyboardLayout *) CFDataGetBytePtr(uchr);
if (!keyboard_layout) return false;
table_init(&keymap_table,
131,
(table_hash_func) hash_keymap,
(table_compare_func) same_keymap);
for (unsigned index = 0; index < 128; ++index) {
CFStringRef key_string = cfstring_from_keycode(keyboard_layout, index);
if (!key_string) continue;
char *c_key_string = copy_cfstring(key_string);
CFRelease(key_string);
if (!c_key_string) continue;
table_add(&keymap_table, c_key_string, (void *)index);
}
return true;
}
#pragma clang diagnostic pop
uint32_t keycode_from_char(char key)
{
char lookup_key[] = { key, '\0' };
uint32_t keycode = (uint32_t) table_find(&keymap_table, &lookup_key);
return keycode;
}
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