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