kc3-lang/gnulib/lib/unistr/u-strstr.h

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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/u-strstr.h

• /* Substring test for UTF-8/UTF-16/UTF-32 strings.
     Copyright (C) 1999, 2002, 2006 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/>.  */
  
  UNIT *
  FUNC (const UNIT *haystack, const UNIT *needle)
  {
    UNIT first = needle[0];
  
    /* Is needle empty?  */
    if (first == 0)
      return (UNIT *) haystack;
  
    /* Is needle nearly empty?  */
    if (needle[1] == 0)
      return U_STRCHR (haystack, first);
  
    /* Search for needle's first unit.  */
    for (; *haystack != 0; haystack++)
      if (*haystack == first)
        {
  	/* Compare with needle's remaining units.  */
  	const UNIT *hptr = haystack + 1;
  	const UNIT *nptr = needle + 1;
  	for (;;)
  	  {
  	    if (*hptr != *nptr)
  	      break;
  	    hptr++; nptr++;
  	    if (*nptr == 0)
  	      return (UNIT *) haystack;
  	  }
        }
  
    return NULL;
  }
  

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