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#include <stdlib.h>
#include <wchar.h>
#include <errno.h>
#include "internal.h"
size_t wcrtomb(char *restrict s, wchar_t wc, mbstate_t *restrict st)
{
if (!s) return 1;
if ((unsigned)wc < 0x80) {
*s = wc;
return 1;
} else if (MB_CUR_MAX == 1) {
if (!IS_CODEUNIT(wc)) {
errno = EILSEQ;
return -1;
}
*s = wc;
return 1;
} else if ((unsigned)wc < 0x800) {
*s++ = 0xc0 | (wc>>6);
*s = 0x80 | (wc&0x3f);
return 2;
} else if ((unsigned)wc < 0xd800 || (unsigned)wc-0xe000 < 0x2000) {
*s++ = 0xe0 | (wc>>12);
*s++ = 0x80 | ((wc>>6)&0x3f);
*s = 0x80 | (wc&0x3f);
return 3;
} else if ((unsigned)wc-0x10000 < 0x100000) {
*s++ = 0xf0 | (wc>>18);
*s++ = 0x80 | ((wc>>12)&0x3f);
*s++ = 0x80 | ((wc>>6)&0x3f);
*s = 0x80 | (wc&0x3f);
return 4;
}
errno = EILSEQ;
return -1;
}
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