thodg/libiconv/lib/iso2022_kr.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/iso2022_kr.h

• 
  /*
   * ISO-2022-KR
   */
  
  /* Specification: RFC 1557 */
  
  /* Note: CJK.INF says the SO designator needs to appear only once at the
     beginning of a text, but to decrease the risk of ambiguities, when
     producing ISO-2022-KR, we repeat the designator in every line containing
     SO characters. RFC 1557 does not mandate this. */
  
  #define ESC 0x1b
  #define SO  0x0e
  #define SI  0x0f
  
  /*
   * The state is composed of one of the following values
   */
  #define STATE_ASCII          0
  #define STATE_TWOBYTE        1
  /*
   * and one of the following values, << 8
   */
  #define STATE2_NONE                0
  #define STATE2_DESIGNATED_KSC5601  1
  
  #define SPLIT_STATE \
    unsigned int state1 = state & 0xff, state2 = state >> 8
  #define COMBINE_STATE \
    state = (state2 << 8) | state1
  
  static int
  iso2022_kr_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  {
    state_t state = conv->istate;
    SPLIT_STATE;
    int count = 0;
    unsigned char c;
    for (;;) {
      c = *s;
      if (c == ESC) {
        if (n < count+4)
          goto none;
        if (s[1] == '$') {
          if (s[2] == ')') {
            if (s[3] == 'C') {
              state2 = STATE2_DESIGNATED_KSC5601;
              s += 4; count += 4;
              if (n < count+1)
                goto none;
              continue;
            }
          }
        }
        return RET_ILSEQ;
      }
      if (c == SO) {
        if (state2 != STATE2_DESIGNATED_KSC5601)
          return RET_ILSEQ;
        state1 = STATE_TWOBYTE;
        s++; count++;
        if (n < count+1)
          goto none;
        continue;
      }
      if (c == SI) {
        state1 = STATE_ASCII;
        s++; count++;
        if (n < count+1)
          goto none;
        continue;
      }
      break;
    }
    switch (state1) {
      case STATE_ASCII:
        if (c < 0x80) {
          int ret = ascii_mbtowc(conv,pwc,s,1);
          if (ret == RET_ILSEQ)
            return RET_ILSEQ;
          if (ret != 1) abort();
  #if 0 /* Accept ISO-2022-KR according to CJK.INF. */
          if (*pwc == 0x000a || *pwc == 0x000d)
            state2 = STATE2_NONE;
  #endif
          COMBINE_STATE;
          conv->istate = state;
          return count+1;
        } else
          return RET_ILSEQ;
      case STATE_TWOBYTE:
        if (n < count+2)
          goto none;
        if (state2 != STATE2_DESIGNATED_KSC5601) abort();
        if (s[0] < 0x80 && s[1] < 0x80) {
          int ret = ksc5601_mbtowc(conv,pwc,s,2);
          if (ret == RET_ILSEQ)
            return RET_ILSEQ;
          if (ret != 2) abort();
          COMBINE_STATE;
          conv->istate = state;
          return count+2;
        } else
          return RET_ILSEQ;
      default: abort();
    }
  
  none:
    COMBINE_STATE;
    conv->istate = state;
    return RET_TOOFEW(count);
  }
  
  static int
  iso2022_kr_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  {
    state_t state = conv->ostate;
    SPLIT_STATE;
    unsigned char buf[2];
    int ret;
  
    /* Try ASCII. */
    ret = ascii_wctomb(conv,buf,wc,1);
    if (ret != RET_ILSEQ) {
      if (ret != 1) abort();
      if (buf[0] < 0x80) {
        int count = (state1 == STATE_ASCII ? 1 : 2);
        if (n < count)
          return RET_TOOSMALL;
        if (state1 != STATE_ASCII) {
          r[0] = SI;
          r += 1;
          state1 = STATE_ASCII;
        }
        r[0] = buf[0];
        if (wc == 0x000a || wc == 0x000d)
          state2 = STATE2_NONE;
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
    }
  
    /* Try KS C 5601-1992. */
    ret = ksc5601_wctomb(conv,buf,wc,2);
    if (ret != RET_ILSEQ) {
      if (ret != 2) abort();
      if (buf[0] < 0x80 && buf[1] < 0x80) {
        int count = (state2 == STATE2_DESIGNATED_KSC5601 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
        if (n < count)
          return RET_TOOSMALL;
        if (state2 != STATE2_DESIGNATED_KSC5601) {
          r[0] = ESC;
          r[1] = '$';
          r[2] = ')';
          r[3] = 'C';
          r += 4;
          state2 = STATE2_DESIGNATED_KSC5601;
        }
        if (state1 != STATE_TWOBYTE) {
          r[0] = SO;
          r += 1;
          state1 = STATE_TWOBYTE;
        }
        r[0] = buf[0];
        r[1] = buf[1];
        COMBINE_STATE;
        conv->ostate = state;
        return count;
      }
    }
  
    return RET_ILSEQ;
  }
  
  static int
  iso2022_kr_reset (conv_t conv, unsigned char *r, int n)
  {
    state_t state = conv->ostate;
    SPLIT_STATE;
    (void)state2;
    if (state1 != STATE_ASCII) {
      if (n < 1)
        return RET_TOOSMALL;
      r[0] = SI;
      /* conv->ostate = 0; will be done by the caller */
      return 1;
    } else
      return 0;
  }
  
  #undef COMBINE_STATE
  #undef SPLIT_STATE
  #undef STATE2_DESIGNATED_KSC5601
  #undef STATE2_NONE
  #undef STATE_TWOBYTE
  #undef STATE_ASCII
  

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