kc3-lang/gnulib/lib/unistr/u8-mbtoucr.c

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• Hash : d60f3b0c
  Author :
  Date : 2011-01-01T20:17:23
  

  maint: update almost all copyright ranges to include 2011
  
  Run the new "make update-copyright" rule.
  

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• lib/unistr/u8-mbtoucr.c

• /* Look at first character in UTF-8 string, returning an error code.
     Copyright (C) 1999-2002, 2006-2007, 2009-2011 Free Software Foundation, Inc.
     Written by Bruno Haible <bruno@clisp.org>, 2001.
  
     This program 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 3 of the License, or
     (at your option) any later version.
  
     This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "unistr.h"
  
  int
  u8_mbtoucr (ucs4_t *puc, const uint8_t *s, size_t n)
  {
    uint8_t c = *s;
  
    if (c < 0x80)
      {
        *puc = c;
        return 1;
      }
    else if (c >= 0xc2)
      {
        if (c < 0xe0)
          {
            if (n >= 2)
              {
                if ((s[1] ^ 0x80) < 0x40)
                  {
                    *puc = ((unsigned int) (c & 0x1f) << 6)
                           | (unsigned int) (s[1] ^ 0x80);
                    return 2;
                  }
                /* invalid multibyte character */
              }
            else
              {
                /* incomplete multibyte character */
                *puc = 0xfffd;
                return -2;
              }
          }
        else if (c < 0xf0)
          {
            if (n >= 2)
              {
                if ((s[1] ^ 0x80) < 0x40
                    && (c >= 0xe1 || s[1] >= 0xa0)
                    && (c != 0xed || s[1] < 0xa0))
                  {
                    if (n >= 3)
                      {
                        if ((s[2] ^ 0x80) < 0x40)
                          {
                            *puc = ((unsigned int) (c & 0x0f) << 12)
                                   | ((unsigned int) (s[1] ^ 0x80) << 6)
                                   | (unsigned int) (s[2] ^ 0x80);
                            return 3;
                          }
                        /* invalid multibyte character */
                      }
                    else
                      {
                        /* incomplete multibyte character */
                        *puc = 0xfffd;
                        return -2;
                      }
                  }
                /* invalid multibyte character */
              }
            else
              {
                /* incomplete multibyte character */
                *puc = 0xfffd;
                return -2;
              }
          }
        else if (c < 0xf8)
          {
            if (n >= 2)
              {
                if ((s[1] ^ 0x80) < 0x40
                    && (c >= 0xf1 || s[1] >= 0x90)
  #if 1
                    && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))
  #endif
                   )
                  {
                    if (n >= 3)
                      {
                        if ((s[2] ^ 0x80) < 0x40)
                          {
                            if (n >= 4)
                              {
                                if ((s[3] ^ 0x80) < 0x40)
                                  {
                                    *puc = ((unsigned int) (c & 0x07) << 18)
                                           | ((unsigned int) (s[1] ^ 0x80) << 12)
                                           | ((unsigned int) (s[2] ^ 0x80) << 6)
                                           | (unsigned int) (s[3] ^ 0x80);
                                    return 4;
                                  }
                                /* invalid multibyte character */
                              }
                            else
                              {
                                /* incomplete multibyte character */
                                *puc = 0xfffd;
                                return -2;
                              }
                          }
                        /* invalid multibyte character */
                      }
                    else
                      {
                        /* incomplete multibyte character */
                        *puc = 0xfffd;
                        return -2;
                      }
                  }
                /* invalid multibyte character */
              }
            else
              {
                /* incomplete multibyte character */
                *puc = 0xfffd;
                return -2;
              }
          }
  #if 0
        else if (c < 0xfc)
          {
            if (n >= 2)
              {
                if ((s[1] ^ 0x80) < 0x40
                    && (c >= 0xf9 || s[1] >= 0x88))
                  {
                    if (n >= 3)
                      {
                        if ((s[2] ^ 0x80) < 0x40)
                          {
                            if (n >= 4)
                              {
                                if ((s[3] ^ 0x80) < 0x40)
                                  {
                                    if (n >= 5)
                                      {
                                        if ((s[4] ^ 0x80) < 0x40)
                                          {
                                            *puc = ((unsigned int) (c & 0x03) << 24)
                                                   | ((unsigned int) (s[1] ^ 0x80) << 18)
                                                   | ((unsigned int) (s[2] ^ 0x80) << 12)
                                                   | ((unsigned int) (s[3] ^ 0x80) << 6)
                                                   | (unsigned int) (s[4] ^ 0x80);
                                            return 5;
                                          }
                                        /* invalid multibyte character */
                                      }
                                    else
                                      {
                                        /* incomplete multibyte character */
                                        *puc = 0xfffd;
                                        return -2;
                                      }
                                  }
                                /* invalid multibyte character */
                              }
                            else
                              {
                                /* incomplete multibyte character */
                                *puc = 0xfffd;
                                return -2;
                              }
                          }
                        /* invalid multibyte character */
                      }
                    else
                      {
                        /* incomplete multibyte character */
                        *puc = 0xfffd;
                        return -2;
                      }
                  }
                /* invalid multibyte character */
              }
            else
              {
                /* incomplete multibyte character */
                *puc = 0xfffd;
                return -2;
              }
          }
        else if (c < 0xfe)
          {
            if (n >= 2)
              {
                if ((s[1] ^ 0x80) < 0x40
                    && (c >= 0xfd || s[1] >= 0x84))
                  {
                    if (n >= 3)
                      {
                        if ((s[2] ^ 0x80) < 0x40)
                          {
                            if (n >= 4)
                              {
                                if ((s[3] ^ 0x80) < 0x40)
                                  {
                                    if (n >= 5)
                                      {
                                        if ((s[4] ^ 0x80) < 0x40)
                                          {
                                            if (n >= 6)
                                              {
                                                if ((s[5] ^ 0x80) < 0x40)
                                                  {
                                                    *puc = ((unsigned int) (c & 0x01) << 30)
                                                           | ((unsigned int) (s[1] ^ 0x80) << 24)
                                                           | ((unsigned int) (s[2] ^ 0x80) << 18)
                                                           | ((unsigned int) (s[3] ^ 0x80) << 12)
                                                           | ((unsigned int) (s[4] ^ 0x80) << 6)
                                                           | (unsigned int) (s[5] ^ 0x80);
                                                    return 6;
                                                  }
                                                /* invalid multibyte character */
                                              }
                                            else
                                              {
                                                /* incomplete multibyte character */
                                                *puc = 0xfffd;
                                                return -2;
                                              }
                                          }
                                        /* invalid multibyte character */
                                      }
                                    else
                                      {
                                        /* incomplete multibyte character */
                                        *puc = 0xfffd;
                                        return -2;
                                      }
                                  }
                                /* invalid multibyte character */
                              }
                            else
                              {
                                /* incomplete multibyte character */
                                *puc = 0xfffd;
                                return -2;
                              }
                          }
                        /* invalid multibyte character */
                      }
                    else
                      {
                        /* incomplete multibyte character */
                        *puc = 0xfffd;
                        return -2;
                      }
                  }
                /* invalid multibyte character */
              }
            else
              {
                /* incomplete multibyte character */
                *puc = 0xfffd;
                return -2;
              }
          }
  #endif
      }
    /* invalid multibyte character */
    *puc = 0xfffd;
    return -1;
  }
  

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