1: /* Access functions for CNS 11643, plane 2 handling.
    2:    Copyright (C) 1998, 1999, 2001, 2003 Free Software Foundation, Inc.
    3:    This file is part of the GNU C Library.
    4:    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
    5: 
    6:    The GNU C Library is free software; you can redistribute it and/or
    7:    modify it under the terms of the GNU Lesser General Public
    8:    License as published by the Free Software Foundation; either
    9:    version 2.1 of the License, or (at your option) any later version.
   10: 
   11:    The GNU C Library is distributed in the hope that it will be useful,
   12:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   13:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   14:    Lesser General Public License for more details.
   15: 
   16:    You should have received a copy of the GNU Lesser General Public
   17:    License along with the GNU C Library; if not, write to the Free
   18:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   19:    02111-1307 USA.  */
   20: 
   21: #include <stdint.h>
   22: #include <gconv.h>
   23: 
   24: /* Table for CNS 11643, plane 2 to UCS4 conversion.  */
   25: extern const uint16_t __cns11643l2_to_ucs4_tab[];
   26: 
   27: 
   28: static inline uint32_t
   29: __attribute ((always_inline))
   30: cns11643l2_to_ucs4 (const unsigned char **s, size_t avail,
   31:                     unsigned char offset)
   32: {
   33:   unsigned char ch = *(*s);
   34:   unsigned char ch2;
   35:   int idx;
   36: 
   37:   if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) > 0x7d)
   38:     return __UNKNOWN_10646_CHAR;
   39: 
   40:   if (avail < 2)
   41:     return 0;
   42: 
   43:   ch2 = (*s)[1];
   44:   if ((ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
   45:     return __UNKNOWN_10646_CHAR;
   46: 
   47:   idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
   48:   if (idx > 0x1de1)
   49:     return __UNKNOWN_10646_CHAR;
   50: 
   51:   (*s) += 2;
   52: 
   53:   return __cns11643l2_to_ucs4_tab[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
   54: }
   55: 
   56: 
   57: /* The table which contains the CNS 11643 level 2 mappings.  */
   58: extern const char __cns11643_from_ucs4p0_tab[][3];
   59: 
   60: 
   61: static inline size_t
   62: __attribute ((always_inline))
   63: ucs4_to_cns11643l2 (uint32_t wch, unsigned char *s, size_t avail)
   64: {
   65:   unsigned int ch = (unsigned int) wch;
   66:   const char *cp = NULL;
   67: 
   68:   if (ch >= 0x4e07 && ch <= 0x9fa4)
   69:     {
   70:       cp = __cns11643_from_ucs4p0_tab[ch - 0x3400];
   71:       if (cp[0] == '\2')
   72:         ++cp;
   73:       else
   74:         cp = NULL;
   75:     }
   76: 
   77:   if (cp == NULL)
   78:     return __UNKNOWN_10646_CHAR;
   79: 
   80:   if (avail < 2)
   81:     return 0;
   82: 
   83:   s[0] = cp[0];
   84:   s[1] = cp[1];
   85: 
   86:   return 2;
   87: }