thodg/libiconv/src/utf8.h

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• Hash : 3af9cd39
  Author :
  Date : 1999-12-31T12:50:49
  

  Import from libiconv-0.3.
  

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• src/utf8.h

• /*
   * UTF-8
   */
  
  /* Specification: RFC 2279 */
  
  static int
  utf8_mbtowc (conv_t conv, wchar_t *pwc, const unsigned char *s, int n)
  {
    unsigned char c = s[0];
  
    if (c < 0x80) {
      *pwc = c;
      return 1;
    } else if (c < 0xc2) {
      return RET_ILSEQ;
    } else if (c < 0xe0) {
      if (n < 2)
        return RET_TOOFEW(0);
      if (!((s[1] ^ 0x80) < 0x40))
        return RET_ILSEQ;
      *pwc = ((wchar_t) (c & 0x1f) << 6)
             | (wchar_t) (s[1] ^ 0x80);
      return 2;
    } else if (c < 0xf0) {
      if (n < 3)
        return RET_TOOFEW(0);
      if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
            && (c >= 0xe1 || s[1] >= 0xa0)))
        return RET_ILSEQ;
      *pwc = ((wchar_t) (c & 0x0f) << 12)
             | ((wchar_t) (s[1] ^ 0x80) << 6)
             | (wchar_t) (s[2] ^ 0x80);
      return 3;
    } else if (c < 0xf8 && sizeof(wchar_t)*8 >= 32) {
      if (n < 4)
        return RET_TOOFEW(0);
      if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
            && (s[3] ^ 0x80) < 0x40
            && (c >= 0xf1 || s[1] >= 0x90)))
        return RET_ILSEQ;
      *pwc = ((wchar_t) (c & 0x07) << 18)
             | ((wchar_t) (s[1] ^ 0x80) << 12)
             | ((wchar_t) (s[2] ^ 0x80) << 6)
             | (wchar_t) (s[3] ^ 0x80);
      return 4;
    } else if (c < 0xfc && sizeof(wchar_t)*8 >= 32) {
      if (n < 5)
        return RET_TOOFEW(0);
      if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
            && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
            && (c >= 0xf9 || s[1] >= 0x88)))
        return RET_ILSEQ;
      *pwc = ((wchar_t) (c & 0x03) << 24)
             | ((wchar_t) (s[1] ^ 0x80) << 18)
             | ((wchar_t) (s[2] ^ 0x80) << 12)
             | ((wchar_t) (s[3] ^ 0x80) << 6)
             | (wchar_t) (s[4] ^ 0x80);
      return 5;
    } else if (c < 0xfe && sizeof(wchar_t)*8 >= 32) {
      if (n < 6)
        return RET_TOOFEW(0);
      if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
            && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
            && (s[5] ^ 0x80) < 0x40
            && (c >= 0xfd || s[1] >= 0x84)))
        return RET_ILSEQ;
      *pwc = ((wchar_t) (c & 0x01) << 30)
             | ((wchar_t) (s[1] ^ 0x80) << 24)
             | ((wchar_t) (s[2] ^ 0x80) << 18)
             | ((wchar_t) (s[3] ^ 0x80) << 12)
             | ((wchar_t) (s[4] ^ 0x80) << 6)
             | (wchar_t) (s[5] ^ 0x80);
      return 6;
    } else
      return RET_ILSEQ;
  }
  
  static int
  utf8_wctomb (conv_t conv, unsigned char *r, wchar_t wc, int n) /* n == 0 is acceptable */
  {
    int count;
    if (wc < 0x80)
      count = 1;
    else if (wc < 0x800)
      count = 2;
    else if (wc < 0x10000)
      count = 3;
    else if (wc < 0x200000)
      count = 4;
    else if (wc < 0x4000000)
      count = 5;
    else if (wc <= 0x7fffffff)
      count = 6;
    else
      return RET_ILSEQ;
    if (n < count)
      return RET_TOOSMALL;
    switch (count) { /* note: code falls through cases! */
      case 6: r[5] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x4000000;
      case 5: r[4] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x200000;
      case 4: r[3] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x10000;
      case 3: r[2] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x800;
      case 2: r[1] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0xc0;
      case 1: r[0] = wc;
    }
    return count;
  }
  

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