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A proper send_string() for the Unicode feature (qmk#8155)
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fauxpark authored and drashna committed Mar 19, 2020
1 parent 6113ff5 commit 88dcb11
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49 changes: 49 additions & 0 deletions quantum/process_keycode/process_unicode_common.c
Original file line number Diff line number Diff line change
Expand Up @@ -178,6 +178,55 @@ void send_unicode_hex_string(const char *str) {
}
}

// Borrowed from https://nullprogram.com/blog/2017/10/06/
const char *decode_utf8(const char *str, int32_t *code_point) {
const char *next;

if (str[0] < 0x80) { // U+0000-007F
*code_point = str[0];
next = str + 1;
} else if ((str[0] & 0xE0) == 0xC0) { // U+0080-07FF
*code_point = ((int32_t)(str[0] & 0x1F) << 6) | ((int32_t)(str[1] & 0x3F) << 0);
next = str + 2;
} else if ((str[0] & 0xF0) == 0xE0) { // U+0800-FFFF
*code_point = ((int32_t)(str[0] & 0x0F) << 12) | ((int32_t)(str[1] & 0x3F) << 6) | ((int32_t)(str[2] & 0x3F) << 0);
next = str + 3;
} else if ((str[0] & 0xF8) == 0xF0 && (str[0] <= 0xF4)) { // U+10000-10FFFF
// Skip for now - register_hex() only takes a uint16
//*code_point = ((int32_t)(str[0] & 0x07) << 18) | ((int32_t)(str[1] & 0x3F) << 12) | ((int32_t)(str[2] & 0x3F) << 6) | ((int32_t)(str[3] & 0x3F) << 0);
*code_point = -1;
next = str + 4;
} else {
*code_point = -1;
next = str + 1;
}

// part of a UTF-16 surrogate pair - invalid
if (*code_point >= 0xD800 && *code_point <= 0xDFFF) {
*code_point = -1;
}

return next;
}

void send_unicode_string(const char *str) {
if (!str) {
return;
}

int32_t code_point = 0;

while (*str) {
str = decode_utf8(str, &code_point);

if (code_point >= 0) {
unicode_input_start();
register_hex(code_point);
unicode_input_finish();
}
}
}

bool process_unicode_common(uint16_t keycode, keyrecord_t *record) {
if (record->event.pressed) {
switch (keycode) {
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1 change: 1 addition & 0 deletions quantum/process_keycode/process_unicode_common.h
Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,7 @@ void unicode_input_cancel(void);

void register_hex(uint16_t hex);
void send_unicode_hex_string(const char *str);
void send_unicode_string(const char *str);

bool process_unicode_common(uint16_t keycode, keyrecord_t *record);

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