30 lines
941 B
C++
30 lines
941 B
C++
//===-- Implementation of strstr ------------------------------------------===//
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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/strstr.h"
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#include "src/__support/common.h"
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#include <stddef.h>
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namespace __llvm_libc {
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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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char *LLVM_LIBC_ENTRYPOINT(strstr)(const char *haystack, const char *needle) {
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for (size_t i = 0; haystack[i]; ++i) {
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size_t j;
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for (j = 0; haystack[i + j] && haystack[i + j] == needle[j]; ++j)
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;
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if (!needle[j])
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return const_cast<char *>(haystack + i);
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}
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return nullptr;
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}
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} // namespace __llvm_libc
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