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static int
ucs2_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]);
s += 2; n -= 2; count += 2;
if (wc == 0xfeff) {
} else if (wc == 0xfffe) {
state ^= 1;
} else if (wc >= 0xd800 && wc < 0xe000) {
conv->istate = state;
return RET_SHIFT_ILSEQ(count);
} else {
*pwc = wc;
conv->istate = state;
return count;
}
}
conv->istate = state;
return RET_TOOFEW(count);
}
static int
ucs2_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
{
if (wc < 0x10000 && wc != 0xfffe && !(wc >= 0xd800 && wc < 0xe000)) {
if (n >= 2) {
r[0] = (unsigned char) (wc >> 8);
r[1] = (unsigned char) wc;
return 2;
} else
return RET_TOOSMALL;
} else
return RET_ILUNI;
}
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