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@@ -0,0 +1,28 @@
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+#include <uchar.h>
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+#include <wchar.h>
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+
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+size_t mbrtoc16(char16_t *restrict pc16, const char *restrict s, size_t n, mbstate_t *restrict ps)
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+{
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+ unsigned *pending = (unsigned *)ps;
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+
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+ if (!s) return mbrtoc16(0, "", 1, ps);
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+
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+ /* mbrtowc states for partial UTF-8 characters have the high bit set;
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+ * we use nonzero states without high bit for pending surrogates. */
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+ if ((int)*pending > 0) {
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+ if (pc16) *pc16 = *pending;
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+ *pending = 0;
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+ return -3;
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+ }
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+
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+ wchar_t wc;
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+ size_t ret = mbrtowc(&wc, s, n, ps);
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+ if (ret <= 4) {
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+ if (wc >= 0x10000) {
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+ *pending = (wc & 0x3ff) + 0xdc00;
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+ wc = 0xd7c0 + (wc >> 10);
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+ }
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+ if (pc16) *pc16 = wc;
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+ }
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+ return ret;
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+}
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