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#include <uchar.h>
#include <errno.h>
#include <wchar.h>
size_t c16rtomb(char *restrict s, char16_t c16, mbstate_t *restrict ps)
{
static unsigned internal_state;
if (!ps) ps = (void *)&internal_state;
unsigned *x = (unsigned *)ps;
wchar_t wc;
if (!s) {
if (*x) goto ilseq;
return 1;
}
if (!*x && c16 - 0xd800u < 0x400) {
*x = c16 - 0xd7c0 << 10;
return 0;
}
if (*x) {
if (c16 - 0xdc00u >= 0x400) goto ilseq;
else wc = *x + c16 - 0xdc00;
*x = 0;
} else {
wc = c16;
}
return wcrtomb(s, wc, 0);
ilseq:
*x = 0;
errno = EILSEQ;
return -1;
}
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