mlow/mpd_control
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Add handling for utf8 chars.

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This commit is contained in:
Matt Low 2019-10-15 23:50:43 +04:00
parent 434c98ecea
commit df77d46645
1 changed files with 107 additions and 9 deletions
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100
mpd_control.c
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@ -16,6 +16,86 @@ struct worker_meta {
char* label;
};
bool
is_utf8(const char * string)
{
if (!string)
return false;
const unsigned char * bytes = (const unsigned char *)string;
while (*bytes) {
if( (// ASCII
// use bytes[0] <= 0x7F to allow ASCII control characters
bytes[0] == 0x09 ||
bytes[0] == 0x0A ||
bytes[0] == 0x0D ||
(0x20 <= bytes[0] && bytes[0] <= 0x7E)
)
) {
bytes += 1;
continue;
}
if( (// non-overlong 2-byte
(0xC2 <= bytes[0] && bytes[0] <= 0xDF) &&
(0x80 <= bytes[1] && bytes[1] <= 0xBF)
)
) {
bytes += 2;
continue;
}
if( (// excluding overlongs
bytes[0] == 0xE0 &&
(0xA0 <= bytes[1] && bytes[1] <= 0xBF) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF)
) ||
(// straight 3-byte
((0xE1 <= bytes[0] && bytes[0] <= 0xEC) ||
bytes[0] == 0xEE ||
bytes[0] == 0xEF) &&
(0x80 <= bytes[1] && bytes[1] <= 0xBF) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF)
) ||
(// excluding surrogates
bytes[0] == 0xED &&
(0x80 <= bytes[1] && bytes[1] <= 0x9F) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF)
)
) {
bytes += 3;
continue;
}
if( (// planes 1-3
bytes[0] == 0xF0 &&
(0x90 <= bytes[1] && bytes[1] <= 0xBF) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF) &&
(0x80 <= bytes[3] && bytes[3] <= 0xBF)
) ||
(// planes 4-15
(0xF1 <= bytes[0] && bytes[0] <= 0xF3) &&
(0x80 <= bytes[1] && bytes[1] <= 0xBF) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF) &&
(0x80 <= bytes[3] && bytes[3] <= 0xBF)
) ||
(// plane 16
bytes[0] == 0xF4 &&
(0x80 <= bytes[1] && bytes[1] <= 0x8F) &&
(0x80 <= bytes[2] && bytes[2] <= 0xBF) &&
(0x80 <= bytes[3] && bytes[3] <= 0xBF)
)
) {
bytes += 4;
continue;
}
return false;
}
return true;
}
static long long
current_timestamp() {
struct timeval te;
@ -26,8 +106,11 @@ current_timestamp() {
static void
scroll_text(char *text_to_scroll, int text_len, char *buffer, int *index,
const int max_length) {
if (*index - text_len > 0)
char last_utf8[5] = { '\0' };
do {
if (*index - text_len > 0) {
*index %= text_len;
}
const int overflow = text_len - *index - max_length;
if (overflow <= 0) {
@ -37,7 +120,22 @@ scroll_text(char *text_to_scroll, int text_len, char *buffer, int *index,
memcpy(buffer, &text_to_scroll[*index], max_length);
}
strcat(last_utf8, &buffer[max_length-1]);
if (is_utf8(last_utf8)) {
break;
}
*index += 1;
} while(true);
buffer[max_length] = '\0';
char utf8[5] = { '\0' };
int i = 0;
do {
memcpy(utf8, &text_to_scroll[*index], ++i);
} while (!is_utf8(utf8));
if (strlen(utf8) > 1) {
*index += strlen(utf8)-1;
}
}
static int