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/* 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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