| /* |
| * UCS-4 |
| */ |
| |
| /* Here we accept 0000FFFE/0000FEFF 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 |
| ucs4_mbtowc (conv_t conv, wchar_t *pwc, const unsigned char *s, int n) |
| { |
| state_t state = conv->istate; |
| int count = 0; |
| for (; n >= 4;) { |
| wchar_t wc = (state |
| ? s[0] + (s[1] << 8) + (s[2] << 16) + (s[3] << 24) |
| : (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3]); |
| s += 4; n -= 4; count += 4; |
| if (wc == 0xfeff) { |
| } else if (wc == 0xfffe) { |
| state ^= 1; |
| } else if (wc <= 0x7fffffff) { |
| *pwc = wc; |
| conv->istate = state; |
| return count; |
| } else |
| return RET_ILSEQ; |
| } |
| conv->istate = state; |
| return RET_TOOFEW(count); |
| } |
| |
| /* But we output UCS-4 in big-endian order, without byte-order mark. */ |
| static int |
| ucs4_wctomb (conv_t conv, unsigned char *r, wchar_t wc, int n) |
| { |
| if (wc != 0xfffe) { |
| if (n >= 4) { |
| r[0] = (unsigned char) (wc >> 24); |
| r[1] = (unsigned char) (wc >> 16); |
| r[2] = (unsigned char) (wc >> 8); |
| r[3] = (unsigned char) wc; |
| return 4; |
| } else |
| return RET_TOOSMALL; |
| } else |
| return RET_ILSEQ; |
| } |