| 1 | //===-- Implementation of strcasestr --------------------------------------===// |
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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/string/strcasestr.h" |
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| 10 | |
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| 11 | #include "src/__support/common.h" |
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| 12 | #include "src/__support/ctype_utils.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 | #include "src/string/memory_utils/inline_strstr.h" |
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| 16 | |
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| 17 | namespace LIBC_NAMESPACE_DECL { |
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| 18 | |
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| 19 | // TODO: This is a simple brute force implementation. This can be |
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| 20 | // improved upon using well known string matching algorithms. |
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| 21 | LLVM_LIBC_FUNCTION(char *, strcasestr, |
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| 22 | (const char *haystack, const char *needle)) { |
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| 23 | auto case_cmp = [](char a, char b) { |
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| 24 | return LIBC_NAMESPACE::internal::tolower(a) - |
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| 25 | LIBC_NAMESPACE::internal::tolower(b); |
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| 26 | }; |
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| 27 | |
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| 28 | LIBC_CRASH_ON_NULLPTR(haystack); |
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| 29 | LIBC_CRASH_ON_NULLPTR(needle); |
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| 30 | return inline_strstr(haystack, needle, case_cmp); |
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| 31 | } |
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| 32 | |
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| 33 | } // namespace LIBC_NAMESPACE_DECL |
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| 34 | |
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