kc3-lang/gnulib/lib/unistr/u8-mbtouc-unsafe.c

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• Hash : ac5cf798
  Author :
  Date : 2007-10-07T17:23:24
  

  Change copyright notice from LGPLv2.0+ to LGPLv3+.
  

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• lib/unistr/u8-mbtouc-unsafe.c

• /* Look at first character in UTF-8 string.
     Copyright (C) 1999-2002, 2006-2007 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"
  
  #if !HAVE_INLINE
  
  int
  u8_mbtouc_unsafe (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 CONFIG_UNICODE_SAFETY
  	      if ((s[1] ^ 0x80) < 0x40)
  #endif
  		{
  		  *puc = ((unsigned int) (c & 0x1f) << 6)
  		         | (unsigned int) (s[1] ^ 0x80);
  		  return 2;
  		}
  	      /* invalid multibyte character */
  	    }
  	  else
  	    {
  	      /* incomplete multibyte character */
  	      *puc = 0xfffd;
  	      return n;
  	    }
  	}
        else if (c < 0xf0)
  	{
  	  if (n >= 3)
  	    {
  #if CONFIG_UNICODE_SAFETY
  	      if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
  		  && (c >= 0xe1 || s[1] >= 0xa0)
  		  && (c != 0xed || s[1] < 0xa0))
  #endif
  		{
  		  *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 n;
  	    }
  	}
        else if (c < 0xf8)
  	{
  	  if (n >= 4)
  	    {
  #if CONFIG_UNICODE_SAFETY
  	      if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
  		  && (s[3] ^ 0x80) < 0x40
  		  && (c >= 0xf1 || s[1] >= 0x90)
  #if 1
  		  && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))
  #endif
  		 )
  #endif
  		{
  		  *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 n;
  	    }
  	}
  #if 0
        else if (c < 0xfc)
  	{
  	  if (n >= 5)
  	    {
  #if CONFIG_UNICODE_SAFETY
  	      if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
  		  && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
  		  && (c >= 0xf9 || s[1] >= 0x88))
  #endif
  		{
  		  *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 n;
  	    }
  	}
        else if (c < 0xfe)
  	{
  	  if (n >= 6)
  	    {
  #if CONFIG_UNICODE_SAFETY
  	      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))
  #endif
  		{
  		  *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 n;
  	    }
  	}
  #endif
      }
    /* invalid multibyte character */
    *puc = 0xfffd;
    return 1;
  }
  
  #endif
  

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