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- /*
- * 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 if (wc >= 0xd800 && wc < 0xe000) {
- return RET_ILSEQ;
- } 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 && !(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_ILSEQ;
- }
-