| /* |
| * 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; |
| } |