ucs4.h
上传用户:yingmei828
上传日期:2007-01-01
资源大小:1646k
文件大小:1k
- /*
- * 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;
- }