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//===-- Implementation of strcasestr --------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/string/strcasestr.h"
#include "src/__support/common.h"
#include "src/__support/ctype_utils.h"
#include "src/__support/macros/config.h"
#include "src/__support/macros/null_check.h"
#include "src/string/memory_utils/inline_strstr.h"
namespace LIBC_NAMESPACE_DECL {
// TODO: This is a simple brute force implementation. This can be
// improved upon using well known string matching algorithms.
LLVM_LIBC_FUNCTION(char *, strcasestr,
(const char *haystack, const char *needle)) {
auto case_cmp = [](char a, char b) {
return LIBC_NAMESPACE::internal::tolower(a) -
LIBC_NAMESPACE::internal::tolower(b);
};
LIBC_CRASH_ON_NULLPTR(haystack);
LIBC_CRASH_ON_NULLPTR(needle);
return inline_strstr(haystack, needle, case_cmp);
}
} // namespace LIBC_NAMESPACE_DECL
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