/**
* @brief edit the current cvar with a char
*/
static void UI_TextEntryNodeEdit (uiNode_t* node, unsigned int unicode)
{
char buffer[MAX_CVAR_EDITING_LENGTH];
/* copy the cvar */
Q_strncpyz(buffer, editedCvar->string, sizeof(buffer));
/* compute result */
if (unicode == K_BACKSPACE) {
if (EXTRADATA(node).cursorPosition > 0){
UTF8_delete_char_at(buffer, EXTRADATA(node).cursorPosition - 1);
EXTRADATA(node).cursorPosition--;
}
} else if (unicode == K_DEL) {
if (EXTRADATA(node).cursorPosition < UTF8_strlen(editedCvar->string)){
UTF8_delete_char_at(buffer, EXTRADATA(node).cursorPosition);
}
} else {
int length = strlen(buffer);
int charLength = UTF8_encoded_len(unicode);
/* is buffer full? */
if (length + charLength >= sizeof(buffer))
return;
int insertedLength = UTF8_insert_char_at(buffer, sizeof(buffer), EXTRADATA(node).cursorPosition, unicode);
if (insertedLength > 0)
EXTRADATA(node).cursorPosition++;
}
/* update the cvar */
Cvar_ForceSet(editedCvar->name, buffer);
}
/**
* @brief Insert a (possibly multibyte) UTF-8 character into a string.
* @param[in] s Start of the string
* @param[in] n Buffer size of the string
* @param[in] pos UTF-8 char offset from the start (not the byte offset)
* @param[in] c Unicode code as 32-bit integer
* @return Number of bytes added
*/
int UTF8_insert_char_at (char* s, int n, int pos, int c)
{
/* Convert the UTF-8 char offset to byte offset */
pos = UTF8_char_offset_to_byte_offset(s, pos);
const int utf8len = UTF8_encoded_len(c);
const int tail = strlen(&s[pos]) + 1;
if (utf8len == 0)
return 0;
if (pos + tail + utf8len > n)
return 0;
/* Insertion: move up rest of string. Also moves string terminator. */
memmove(&s[pos + utf8len], &s[pos], tail);
if (c <= 0x7f) {
s[pos] = c;
} else if (c <= 0x7ff) { /* c has 11 bits */
s[pos] = 0xc0 | (c >> 6); /* high 5 bits */
s[pos + 1] = 0x80 | (c & 0x3f); /* low 6 bits */
} else if (c <= 0xffff) { /* c has 16 bits */
/**
* @brief edit the current cvar with a char
*/
static void UI_TextEntryNodeEdit (uiNode_t *node, unsigned int key)
{
char buffer[MAX_CVAR_EDITING_LENGTH];
int length;
/* copy the cvar */
Q_strncpyz(buffer, editedCvar->string, sizeof(buffer));
length = strlen(buffer);
/* compute result */
if (key == K_BACKSPACE) {
length = UTF8_delete_char(buffer, length - 1);
} else {
int charLength = UTF8_encoded_len(key);
/* is buffer full? */
if (length + charLength >= sizeof(buffer))
return;
length += UTF8_insert_char(buffer, sizeof(buffer), length, key);
}
/* update the cvar */
Cvar_ForceSet(editedCvar->name, buffer);
}
