1 | //===-- Implementation of wcspbrk -----------------------------------------===// |
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/wchar/wcspbrk.h" |
10 | |
11 | #include "hdr/types/wchar_t.h" |
12 | #include "src/__support/common.h" |
13 | #include "src/__support/macros/null_check.h" |
14 | |
15 | namespace LIBC_NAMESPACE_DECL { |
16 | |
17 | bool contains_char(const wchar_t *str, wchar_t target) { |
18 | for (; *str != L'\0'; str++) |
19 | if (*str == target) |
20 | return true; |
21 | |
22 | return false; |
23 | } |
24 | |
25 | LLVM_LIBC_FUNCTION(const wchar_t *, wcspbrk, |
26 | (const wchar_t *src, const wchar_t *breakset)) { |
27 | LIBC_CRASH_ON_NULLPTR(src); |
28 | LIBC_CRASH_ON_NULLPTR(breakset); |
29 | |
30 | // currently O(n * m), can be further optimized to O(n + m) with a hash set |
31 | for (int src_idx = 0; src[src_idx] != 0; src_idx++) |
32 | if (contains_char(breakset, src[src_idx])) |
33 | return src + src_idx; |
34 | |
35 | return nullptr; |
36 | } |
37 | |
38 | } // namespace LIBC_NAMESPACE_DECL |
39 | |