| 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/string/memory_utils/inline_strstr.h" |
| 14 | |
| 15 | namespace LIBC_NAMESPACE { |
| 16 | |
| 17 | // TODO: This is a simple brute force implementation. This can be |
| 18 | // improved upon using well known string matching algorithms. |
| 19 | LLVM_LIBC_FUNCTION(char *, strcasestr, |
| 20 | (const char *haystack, const char *needle)) { |
| 21 | auto case_cmp = [](char a, char b) { |
| 22 | return LIBC_NAMESPACE::internal::tolower(ch: a) - |
| 23 | LIBC_NAMESPACE::internal::tolower(ch: b); |
| 24 | }; |
| 25 | return inline_strstr(haystack, needle, comp&: case_cmp); |
| 26 | } |
| 27 | |
| 28 | } // namespace LIBC_NAMESPACE |
| 29 |