1 //===-- Implementation of lfind -------------------------------*- C++ -*-===// 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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "src/search/lfind.h" 10 #include "src/__support/CPP/cstddef.h" // cpp::byte 11 #include "src/__support/common.h" 12 #include "src/__support/macros/config.h" 13 #include "src/__support/memory_size.h" 14 15 namespace LIBC_NAMESPACE_DECL { 16 LLVM_LIBC_FUNCTION(void *, lfind, 17 (const void *key, const void *base, size_t *nmemb, 18 size_t size, int (*compar)(const void *, const void *))) { 19 if (key == nullptr || base == nullptr || nmemb == nullptr || 20 compar == nullptr) 21 return nullptr; 22 23 size_t byte_len = 0; 24 if (internal::mul_overflow(*nmemb, size, &byte_len)) 25 return nullptr; 26 27 const cpp::byte *next = reinterpret_cast<const cpp::byte *>(base); 28 const cpp::byte *end = next + byte_len; 29 for (; next < end; next += size) 30 if (compar(key, next) == 0) 31 return const_cast<cpp::byte *>(next); 32 return nullptr; 33 } 34 35 } // namespace LIBC_NAMESPACE_DECL 36