| 1 | //===-- Implementation of wcsrchr -----------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/wchar/wcsrchr.h" |
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| 10 | |
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| 11 | #include "hdr/types/wchar_t.h" |
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| 12 | #include "src/__support/common.h" |
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| 13 | #include "src/__support/macros/config.h" |
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| 14 | #include "src/__support/macros/null_check.h" |
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| 15 | |
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| 16 | namespace LIBC_NAMESPACE_DECL { |
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| 17 | |
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| 18 | LLVM_LIBC_FUNCTION(const wchar_t *, wcsrchr, (const wchar_t *s, wchar_t c)) { |
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| 19 | LIBC_CRASH_ON_NULLPTR(s); |
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| 20 | |
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| 21 | const wchar_t *last_occurrence = nullptr; |
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| 22 | while (true) { |
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| 23 | if (*s == c) |
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| 24 | last_occurrence = s; |
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| 25 | if (*s == L'\0') |
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| 26 | return last_occurrence; |
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| 27 | ++s; |
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| 28 | } |
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| 29 | } |
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| 30 | |
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| 31 | } // namespace LIBC_NAMESPACE_DECL |
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| 32 | |
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