31 lines
726 B
C
31 lines
726 B
C
#include <uchar.h>
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#include <wchar.h>
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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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static unsigned internal_state;
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if (!ps) ps = (void *)&internal_state;
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unsigned *pending = (unsigned *)ps;
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if (!s) return mbrtoc16(0, "", 1, ps);
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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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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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