28 lines · cpp
1//===-- Implementation of strstr ------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/string/strstr.h"10 11#include "src/__support/common.h"12#include "src/__support/macros/config.h"13#include "src/__support/macros/null_check.h"14#include "src/string/memory_utils/inline_strstr.h"15 16namespace LIBC_NAMESPACE_DECL {17 18// TODO: This is a simple brute force implementation. This can be19// improved upon using well known string matching algorithms.20LLVM_LIBC_FUNCTION(char *, strstr, (const char *haystack, const char *needle)) {21 auto comp = [](char l, char r) -> int { return l - r; };22 LIBC_CRASH_ON_NULLPTR(haystack);23 LIBC_CRASH_ON_NULLPTR(needle);24 return inline_strstr(haystack, needle, comp);25}26 27} // namespace LIBC_NAMESPACE_DECL28