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

• /* Search character in UTF-8 string.
     Copyright (C) 1999, 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 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"
  
  uint8_t *
  u8_strchr (const uint8_t *s, ucs4_t uc)
  {
    uint8_t c[6];
  
    if (uc < 0x80)
      {
        uint8_t c0 = uc;
  
        for (;; s++)
  	{
  	  if (*s == c0)
  	    break;
  	  if (*s == 0)
  	    goto notfound;
  	}
        return (uint8_t *) s;
      }
    else
      switch (u8_uctomb_aux (c, uc, 6))
        {
        case 2:
  	if (*s == 0)
  	  goto notfound;
  	{
  	  uint8_t c0 = c[0];
  	  uint8_t c1 = c[1];
  
  	  for (;; s++)
  	    {
  	      if (s[1] == 0)
  		goto notfound;
  	      if (*s == c0 && s[1] == c1)
  		break;
  	    }
  	  return (uint8_t *) s;
  	}
  
        case 3:
  	if (*s == 0 || s[1] == 0)
  	  goto notfound;
  	{
  	  uint8_t c0 = c[0];
  	  uint8_t c1 = c[1];
  	  uint8_t c2 = c[2];
  
  	  for (;; s++)
  	    {
  	      if (s[2] == 0)
  		goto notfound;
  	      if (*s == c0 && s[1] == c1 && s[2] == c2)
  		break;
  	    }
  	  return (uint8_t *) s;
  	}
  
        case 4:
  	if (*s == 0 || s[1] == 0 || s[2] == 0)
  	  goto notfound;
  	{
  	  uint8_t c0 = c[0];
  	  uint8_t c1 = c[1];
  	  uint8_t c2 = c[2];
  	  uint8_t c3 = c[3];
  
  	  for (;; s++)
  	    {
  	      if (s[3] == 0)
  		goto notfound;
  	      if (*s == c0 && s[1] == c1 && s[2] == c2 && s[3] == c3)
  		break;
  	    }
  	  return (uint8_t *) s;
  	}
        }
  notfound:
    return NULL;
  }
  

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