kmx git

/* 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 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.  */

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

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lib/unistr/u-strstr.h
