home *** CD-ROM | disk | FTP | other *** search
- /*
- * BIG5HKSCS
- */
-
- /*
- * BIG5HKSCS can be downloaded from
- * http://www.info.gov.hk/digital21/eng/hkscs/download.html
- * http://www.info.gov.hk/digital21/eng/hkscs/index.html
- *
- * It extends BIG5 (without the rows 0xC6..0xC7) through the ranges
- *
- * 0x{88..8D}{40..7E,A1..FE} 641 characters
- * 0x{8E..A0}{40..7E,A1..FE} 2898 characters
- * 0x{C6..C8}{40..7E,A1..FE} 359 characters
- * 0xF9{D6..FE} 41 characters
- * 0x{FA..FE}{40..7E,A1..FE} 763 characters
- *
- * It thereby introduces an irreversible mapping
- * 0x8BF8 0x9F9C
- * 0xC074 0x9F9C
- */
-
- #include "hkscs.h"
-
- static int
- big5hkscs_mbtowc (conv_t conv, wchar_t *pwc, const unsigned char *s, int n)
- {
- unsigned char c = *s;
- /* Code set 0 (ASCII) */
- if (c < 0x80)
- return ascii_mbtowc(conv,pwc,s,n);
- /* Code set 1 (BIG5 extended) */
- if (c >= 0xa1 && c < 0xff) {
- if (n < 2)
- return RET_TOOFEW(0);
- {
- unsigned char c2 = s[1];
- if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff)) {
- if (!((c == 0xc6 && c2 >= 0xa1) || c == 0xc7)) {
- int ret = big5_mbtowc(conv,pwc,s,2);
- if (ret != RET_ILSEQ)
- return ret;
- }
- }
- }
- }
- return hkscs_mbtowc(conv,pwc,s,n);
- }
-
- static int
- big5hkscs_wctomb (conv_t conv, unsigned char *r, wchar_t wc, int n)
- {
- unsigned char buf[2];
- int ret;
-
- /* Code set 0 (ASCII) */
- ret = ascii_wctomb(conv,r,wc,n);
- if (ret != RET_ILSEQ)
- return ret;
-
- /* Code set 1 (BIG5 extended) */
- ret = big5_wctomb(conv,buf,wc,2);
- if (ret != RET_ILSEQ) {
- if (ret != 2) abort();
- if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) {
- if (n < 2)
- return RET_TOOSMALL;
- r[0] = buf[0];
- r[1] = buf[1];
- return 2;
- }
- }
- return hkscs_wctomb(conv,r,wc,n);
- }
-