kmx git

/* Check UTF-8 string.
   Copyright (C) 2002, 2006-2007 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2002.

   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"

const uint8_t *
u8_check (const uint8_t *s, size_t n)
{
  const uint8_t *s_end = s + n;

  while (s < s_end)
    {
      /* Keep in sync with unistr.h and utf8-ucs4.c.  */
      uint8_t c = *s;

      if (c < 0x80)
	{
	  s++;
	  continue;
	}
      if (c >= 0xc2)
	{
	  if (c < 0xe0)
	    {
	      if (s + 2 <= s_end
		  && (s[1] ^ 0x80) < 0x40)
		{
		  s += 2;
		  continue;
		}
	    }
	  else if (c < 0xf0)
	    {
	      if (s + 3 <= s_end
		  && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
		  && (c >= 0xe1 || s[1] >= 0xa0)
		  && (c != 0xed || s[1] < 0xa0))
		{
		  s += 3;
		  continue;
		}
	    }
	  else if (c < 0xf8)
	    {
	      if (s + 4 <= s_end
		  && (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
		 )
		{
		  s += 4;
		  continue;
		}
	    }
#if 0
	  else if (c < 0xfc)
	    {
	      if (s + 5 <= s_end
		  && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
		  && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
		  && (c >= 0xf9 || s[1] >= 0x88))
		{
		  s += 5;
		  continue;
		}
	    }
	  else if (c < 0xfe)
	    {
	      if (s + 6 <= s_end
		  && (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))
		{
		  s += 6;
		  continue;
		}
	    }
#endif
	}
      /* invalid or incomplete multibyte character */
      return s;
    }
  return NULL;
}
kc3-lang/gnulib/lib/unistr/u8-check.c

Commit

lib/unistr/u8-check.c
