text: /* Access functions for CNS 11643, plane 2 handling.
     Copyright (C) 1998, 1999, 2001, 2003 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
     Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <http://www.gnu.org/licenses/>.  */
  
  #include <stdint.h>
  #include <gconv.h>
  
  /* Table for CNS 11643, plane 2 to UCS4 conversion.  */
  extern const uint16_t __cns11643l2_to_ucs4_tab[];
  
  
  static inline uint32_t
  __attribute ((always_inline))
  cns11643l2_to_ucs4 (const unsigned char **s, size_t avail,
  		    unsigned char offset)
  {
    unsigned char ch = *(*s);
    unsigned char ch2;
    int idx;
  
    if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) > 0x7d)
      return __UNKNOWN_10646_CHAR;
  
    if (avail < 2)
      return 0;
  
    ch2 = (*s)[1];
    if ((ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
      return __UNKNOWN_10646_CHAR;
  
    idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
    if (idx > 0x1de1)
      return __UNKNOWN_10646_CHAR;
  
    (*s) += 2;
  
    return __cns11643l2_to_ucs4_tab[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
  }
  
  
  /* The table which contains the CNS 11643 level 2 mappings.  */
  extern const char __cns11643_from_ucs4p0_tab[][3];
  
  
  static inline size_t
  __attribute ((always_inline))
  ucs4_to_cns11643l2 (uint32_t wch, unsigned char *s, size_t avail)
  {
    unsigned int ch = (unsigned int) wch;
    const char *cp = NULL;
  
    if (ch >= 0x4e07 && ch <= 0x9fa4)
      {
        cp = __cns11643_from_ucs4p0_tab[ch - 0x3400];
        if (cp[0] == '\2')
  	++cp;
        else
  	cp = NULL;
      }
  
    if (cp == NULL)
      return __UNKNOWN_10646_CHAR;
  
    if (avail < 2)
      return 0;
  
    s[0] = cp[0];
    s[1] = cp[1];
  
    return 2;
  }
  