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  1. /* Routine to translate from Japanese characters to Unicode */
  2.  
  3. /* Copyright (c) 2002 Red Hat Incorporated.
  4.    All rights reserved.
  5.  
  6.    Redistribution and use in source and binary forms, with or without
  7.    modification, are permitted provided that the following conditions are met:
  8.  
  9.      Redistributions of source code must retain the above copyright
  10.      notice, this list of conditions and the following disclaimer.
  11.  
  12.      Redistributions in binary form must reproduce the above copyright
  13.      notice, this list of conditions and the following disclaimer in the
  14.      documentation and/or other materials provided with the distribution.
  15.  
  16.      The name of Red Hat Incorporated may not be used to endorse
  17.      or promote products derived from this software without specific
  18.      prior written permission.
  19.  
  20.    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21.    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22.    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23.    ARE DISCLAIMED.  IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY
  24.    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  25.    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26.    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27.    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28.    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS  
  29.    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30. */
  31.  
  32. #include <newlib.h>
  33.  
  34. #ifdef _MB_CAPABLE
  35. /* Under Cygwin, the incoming wide character is already given in UTF due
  36.    to the requirements of the underlying OS. */
  37. #ifndef __CYGWIN__
  38.  
  39. #include <_ansi.h>
  40. #include <string.h>
  41. #include <wctype.h>
  42. #include "local.h"
  43. #include "jp2uc.h"
  44.  
  45. /* Japanese encoding types supported */
  46. #define JP_JIS          1
  47. #define JP_SJIS         2
  48. #define JP_EUCJP        3
  49.  
  50. static wint_t
  51. _DEFUN (__jp2uc, (c, type), wint_t c _AND int type)
  52. {
  53.   int index, adj;
  54.   unsigned char byte1, byte2;
  55.   wint_t ret;
  56.  
  57.   /* we actually use tables of EUCJP to Unicode.  For JIS, we simply
  58.      note that EUCJP is essentially JIS with the top bits on in each
  59.      byte and translate to EUCJP.  For SJIS, we do a translation to EUCJP before
  60.      accessing the tables. */
  61.   switch (type)
  62.     {
  63.     case JP_JIS:
  64.       byte1 = (c >> 8) + 0x80;
  65.       byte2 = (c & 0xff) + 0x80;
  66.       break;
  67.     case JP_EUCJP:
  68.       byte1 = (c >> 8);
  69.       byte2 = (c & 0xff);
  70.       break;
  71.     case JP_SJIS:
  72.       byte1 = c >> 8;
  73.       byte2 = c & 0xff;
  74.       if (byte2 <= 0x9e)
  75.         {
  76.           adj = 0xa1 - 0x22;
  77.           byte2 = (byte2 - 31) + 0xa1;
  78.         }
  79.       else
  80.         {
  81.           adj = 0xa1 - 0x21;
  82.           byte2 = (byte2 - 126) + 0xa1;
  83.         }
  84.       if (byte1 <= 0x9f)
  85.         byte1 = ((byte1 - 112) << 1) + adj;
  86.       else
  87.         byte1 = ((byte1 - 176) << 1) + adj;
  88.       break;
  89.     default:
  90.       return WEOF;
  91.     }
  92.  
  93.   /* find conversion in jp2uc arrays */
  94.  
  95.   /* handle larger ranges first */
  96.   if (byte1 >= 0xb0 && byte1 <= 0xcf && c <= 0xcfd3)
  97.     {
  98.       index = (byte1 - 0xb0) * 0xfe + (byte2 - 0xa1);
  99.       return b02cf[index];
  100.     }
  101.   else if (byte1 >= 0xd0 && byte1 <= 0xf4 && c <= 0xf4a6)
  102.     {
  103.       index = (byte1 - 0xd0) * 0xfe + (byte2 - 0xa1);
  104.       return d02f4[index];
  105.     }
  106.  
  107.   /* handle smaller ranges here */    
  108.   switch (byte1)
  109.     {
  110.     case 0xA1:
  111.       return (wint_t)a1[byte2 - 0xa1];
  112.     case 0xA2:
  113.       ret = a2[byte2 - 0xa1];
  114.       if (ret != 0)
  115.         return (wint_t)ret;
  116.       break;
  117.     case 0xA3:
  118.       if (a3[byte2 - 0xa1])
  119.         return (wint_t)(0xff00 + (byte2 - 0xa0));
  120.       break;
  121.     case 0xA4:
  122.       if (byte2 <= 0xf3)
  123.         return (wint_t)(0x3000 + (byte2 - 0x60));
  124.       break;
  125.     case 0xA5:
  126.       if (byte2 <= 0xf6)
  127.         return (wint_t)(0x3000 + byte2);
  128.       break;
  129.     case 0xA6:
  130.       ret = 0;
  131.       if (byte2 <= 0xd8)
  132.         ret = (wint_t)a6[byte2 - 0xa1];
  133.       if (ret != 0)
  134.         return ret;
  135.       break;
  136.     case 0xA7:
  137.       ret = 0;
  138.       if (byte2 <= 0xf1)
  139.         ret = (wint_t)a7[byte2 - 0xa1];
  140.       if (ret != 0)
  141.         return ret;
  142.       break;
  143.     case 0xA8:
  144.       if (byte2 <= 0xc0)
  145.         return (wint_t)a8[byte2 - 0xa1];
  146.       break;
  147.     default:
  148.       return WEOF;
  149.     }
  150.  
  151.   return WEOF;
  152. }
  153.  
  154. wint_t
  155. _DEFUN (_jp2uc, (c), wint_t c)
  156. {
  157.   if (!strcmp (__locale_charset (), "JIS"))
  158.     c = __jp2uc (c, JP_JIS);
  159.   else if (!strcmp (__locale_charset (), "SJIS"))
  160.     c = __jp2uc (c, JP_SJIS);
  161.   else if (!strcmp (__locale_charset (), "EUCJP"))
  162.     c = __jp2uc (c, JP_EUCJP);
  163.   return c;
  164. }
  165.  
  166. #endif /* !__CYGWIN__ */
  167. #endif /* _MB_CAPABLE */
  168.