1*71db0c75SAndroid Build Coastguard Worker //===-- Implementation of strcasestr --------------------------------------===// 2*71db0c75SAndroid Build Coastguard Worker // 3*71db0c75SAndroid Build Coastguard Worker // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*71db0c75SAndroid Build Coastguard Worker // See https://llvm.org/LICENSE.txt for license information. 5*71db0c75SAndroid Build Coastguard Worker // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*71db0c75SAndroid Build Coastguard Worker // 7*71db0c75SAndroid Build Coastguard Worker //===----------------------------------------------------------------------===// 8*71db0c75SAndroid Build Coastguard Worker 9*71db0c75SAndroid Build Coastguard Worker #include "src/string/strcasestr.h" 10*71db0c75SAndroid Build Coastguard Worker 11*71db0c75SAndroid Build Coastguard Worker #include "src/__support/common.h" 12*71db0c75SAndroid Build Coastguard Worker #include "src/__support/ctype_utils.h" 13*71db0c75SAndroid Build Coastguard Worker #include "src/__support/macros/config.h" 14*71db0c75SAndroid Build Coastguard Worker #include "src/string/memory_utils/inline_strstr.h" 15*71db0c75SAndroid Build Coastguard Worker 16*71db0c75SAndroid Build Coastguard Worker namespace LIBC_NAMESPACE_DECL { 17*71db0c75SAndroid Build Coastguard Worker 18*71db0c75SAndroid Build Coastguard Worker // TODO: This is a simple brute force implementation. This can be 19*71db0c75SAndroid Build Coastguard Worker // improved upon using well known string matching algorithms. 20*71db0c75SAndroid Build Coastguard Worker LLVM_LIBC_FUNCTION(char *, strcasestr, 21*71db0c75SAndroid Build Coastguard Worker (const char *haystack, const char *needle)) { __anon3abebf140102(char a, char b) 22*71db0c75SAndroid Build Coastguard Worker auto case_cmp = [](char a, char b) { 23*71db0c75SAndroid Build Coastguard Worker return LIBC_NAMESPACE::internal::tolower(a) - 24*71db0c75SAndroid Build Coastguard Worker LIBC_NAMESPACE::internal::tolower(b); 25*71db0c75SAndroid Build Coastguard Worker }; 26*71db0c75SAndroid Build Coastguard Worker return inline_strstr(haystack, needle, case_cmp); 27*71db0c75SAndroid Build Coastguard Worker } 28*71db0c75SAndroid Build Coastguard Worker 29*71db0c75SAndroid Build Coastguard Worker } // namespace LIBC_NAMESPACE_DECL 30