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static int
utf16_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
{
state_t state = conv->istate;
int count = 0;
for (; n >= 2;) {
ucs4_t wc = (state ? s[0] + (s[1] << 8) : (s[0] << 8) + s[1]);
if (wc == 0xfeff) {
} else if (wc == 0xfffe) {
state ^= 1;
} else if (wc >= 0xd800 && wc < 0xdc00) {
if (n >= 4) {
ucs4_t wc2 = (state ? s[2] + (s[3] << 8) : (s[2] << 8) + s[3]);
if (!(wc2 >= 0xdc00 && wc2 < 0xe000))
goto ilseq;
*pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00);
conv->istate = state;
return count+4;
} else
break;
} else if (wc >= 0xdc00 && wc < 0xe000) {
goto ilseq;
} else {
*pwc = wc;
conv->istate = state;
return count+2;
}
s += 2; n -= 2; count += 2;
}
conv->istate = state;
return RET_TOOFEW(count);
ilseq:
conv->istate = state;
return RET_SHIFT_ILSEQ(count);
}
static int
utf16_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
{
if (wc != 0xfffe && !(wc >= 0xd800 && wc < 0xe000)) {
int count = 0;
if (!conv->ostate) {
if (n >= 2) {
r[0] = 0xFE;
r[1] = 0xFF;
r += 2; n -= 2; count += 2;
} else
return RET_TOOSMALL;
}
if (wc < 0x10000) {
if (n >= 2) {
r[0] = (unsigned char) (wc >> 8);
r[1] = (unsigned char) wc;
conv->ostate = 1;
return count+2;
} else
return RET_TOOSMALL;
}
else if (wc < 0x110000) {
if (n >= 4) {
ucs4_t wc1 = 0xd800 + ((wc - 0x10000) >> 10);
ucs4_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff);
r[0] = (unsigned char) (wc1 >> 8);
r[1] = (unsigned char) wc1;
r[2] = (unsigned char) (wc2 >> 8);
r[3] = (unsigned char) wc2;
conv->ostate = 1;
return count+4;
} else
return RET_TOOSMALL;
}
}
return RET_ILUNI;
}
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