1 /* Substring test for UTF-8/UTF-16/UTF-32 strings.
2 Copyright (C) 1999, 2002, 2006 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2002.
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of the GNU Library General Public License as published
7 by the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
21 FUNC (const UNIT *haystack, const UNIT *needle)
23 UNIT first = needle[0];
25 /* Is needle empty? */
27 return (UNIT *) haystack;
29 /* Is needle nearly empty? */
31 return U_STRCHR (haystack, first);
33 /* Search for needle's first unit. */
34 for (; *haystack != 0; haystack++)
35 if (*haystack == first)
37 /* Compare with needle's remaining units. */
38 const UNIT *hptr = haystack + 1;
39 const UNIT *nptr = needle + 1;
46 return (UNIT *) haystack;