1 //===-- Implementation of strcasestr --------------------------------------===// 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/string/strcasestr.h" 10 11 #include "src/__support/common.h" 12 #include "src/__support/ctype_utils.h" 13 #include "src/__support/macros/config.h" 14 #include "src/string/memory_utils/inline_strstr.h" 15 16 namespace LIBC_NAMESPACE_DECL { 17 18 // TODO: This is a simple brute force implementation. This can be 19 // improved upon using well known string matching algorithms. 20 LLVM_LIBC_FUNCTION(char *, strcasestr, 21 (const char *haystack, const char *needle)) { __anon3abebf140102(char a, char b) 22 auto case_cmp = [](char a, char b) { 23 return LIBC_NAMESPACE::internal::tolower(a) - 24 LIBC_NAMESPACE::internal::tolower(b); 25 }; 26 return inline_strstr(haystack, needle, case_cmp); 27 } 28 29 } // namespace LIBC_NAMESPACE_DECL 30