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#include <stdint.h>
#include <stddef.h>
#include "unicode.h"
size_t utf8_encode(char *str, uint32_t ch) {
size_t len = 0;
uint8_t first;
if (ch < 0x80) {
first = 0;
len = 1;
} else if (ch < 0x800) {
first = 0xc0;
len = 2;
} else if (ch < 0x10000) {
first = 0xe0;
len = 3;
} else {
first = 0xf0;
len = 4;
}
for (size_t i = len - 1; i > 0; --i) {
str[i] = (ch & 0x3f) | 0x80;
ch >>= 6;
}
str[0] = ch | first;
return len;
}