/*
* UCS-2
*/
/* Here we accept FFFE/FEFF marks as endianness indicators everywhere
in the stream, not just at the beginning. The default is big-endian. */
/* The state is 0 if big-endian, 1 if little-endian. */
static int
ucs2_mbtowc (conv_t conv, wchar_t *pwc, const unsigned char *s, int n)
{
state_t state = conv->istate;
int count = 0;
for (; n >= 2;) {
wchar_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 {
*pwc = wc;
conv->istate = state;
return count;
}
}
conv->istate = state;
return RET_TOOFEW(count);
}
/* But we output UCS-2 in big-endian order, without byte-order mark. */
/* RFC 2152 says:
"ISO/IEC 10646-1:1993(E) specifies that when characters the UCS-2 form are
serialized as octets, that the most significant octet appear first." */
static int
ucs2_wctomb (conv_t conv, unsigned char *r, wchar_t wc, int n)
{
if (wc < 0x10000 && wc != 0xfffe) {
if (n >= 2) {
r[0] = (unsigned char) (wc >> 8);
r[1] = (unsigned char) wc;
return 2;
} else
return RET_TOOSMALL;
} else
return RET_ILSEQ;
}
