thodg/libiconv/lib/big5hkscs.h

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• Hash : a615528b
  Author :
  Date : 2000-11-23T19:54:07
  

  Move src/ to lib/, and install the iconv program.
  

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• lib/big5hkscs.h

• /*
   * 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, ucs4_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, ucs4_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);
  }
  

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