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/* Substring test for UTF-8 strings.
Copyright (C) 1999, 2002, 2006, 2010-2024 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2002.
This file is free software.
It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
You can redistribute it and/or modify it under either
- the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3, or (at your
option) any later version, or
- the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version, or
- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
This file 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 and the GNU General Public License
for more details.
You should have received a copy of the GNU Lesser General Public
License and of the GNU General Public License along with this
program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "unistr.h"
#include <string.h>
uint8_t *
u8_strstr (const uint8_t *haystack, const uint8_t *needle)
{
uint8_t first = needle[0];
/* Is needle empty? */
if (first == 0)
return (uint8_t *) haystack;
/* Is needle nearly empty (only one unit)? */
if (needle[1] == 0)
return u8_strchr (haystack, first);
/* Is needle nearly empty (only one character)? */
{
ucs4_t first_uc;
int count = u8_strmbtouc (&first_uc, needle);
if (count > 0 && needle[count] == 0)
return u8_strchr (haystack, first_uc);
}
return (uint8_t *) strstr ((const char *) haystack, (const char *) needle);
}
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