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#include <uchar.h> #include <wchar.h> size_t mbrtoc16(char16_t *restrict pc16, const char *restrict s, size_t n, mbstate_t *restrict ps) { static unsigned internal_state; if (!ps) ps = (void *)&internal_state; unsigned *pending = (unsigned *)ps; if (!s) return mbrtoc16(0, "", 1, ps); /* mbrtowc states for partial UTF-8 characters have the high bit set; * we use nonzero states without high bit for pending surrogates. */ if ((int)*pending > 0) { if (pc16) *pc16 = *pending; *pending = 0; return -3; } wchar_t wc; size_t ret = mbrtowc(&wc, s, n, ps); if (ret <= 4) { if (wc >= 0x10000) { *pending = (wc & 0x3ff) + 0xdc00; wc = 0xd7c0 + (wc >> 10); } if (pc16) *pc16 = wc; } return ret; } |