kmx git

/* Look at first character in UTF-8 string, returning an error code.
   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 Library General Public License as published
   by the Free Software Foundation; either version 2, 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
   USA.  */

#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;
}
kc3-lang/gnulib/lib/unistr/u8-mbtoucr.c

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lib/unistr/u8-mbtoucr.c
