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diff --git a/absl/log/internal/fnmatch.h b/absl/log/internal/fnmatch.h
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+// Copyright 2023 The Abseil Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_LOG_INTERNAL_FNMATCH_H_
+#define ABSL_LOG_INTERNAL_FNMATCH_H_
+
+#include "absl/base/config.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace log_internal {
+// Like POSIX `fnmatch`, but:
+// * accepts `string_view`
+// * does not allocate any dynamic memory
+// * only supports * and ? wildcards and not bracket expressions [...]
+// * wildcards may match /
+// * no backslash-escaping
+bool FNMatch(absl::string_view pattern, absl::string_view str);
+}  // namespace log_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_LOG_INTERNAL_FNMATCH_H_