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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; } |