// Copyright 2024 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_DEBUGGING_INTERNAL_DECODE_RUST_PUNYCODE_H_ #define ABSL_DEBUGGING_INTERNAL_DECODE_RUST_PUNYCODE_H_ #include "absl/base/config.h" #include "absl/base/nullability.h" namespace absl { ABSL_NAMESPACE_BEGIN namespace debugging_internal { struct DecodeRustPunycodeOptions { … }; // Given Rust Punycode in `punycode_begin .. punycode_end`, writes the // corresponding UTF-8 plaintext into `out_begin .. out_end`, followed by a NUL // character, and returns a pointer to that final NUL on success. On failure // returns a null pointer, and the contents of `out_begin .. out_end` are // unspecified. // // Failure occurs in precisely these cases: // - Any input byte does not match [0-9a-zA-Z_]. // - The first input byte is an underscore, but no other underscore appears in // the input. // - The delta sequence does not represent a valid sequence of code-point // insertions. // - The plaintext would contain more than 256 code points. // // DecodeRustPunycode is async-signal-safe with bounded runtime and a small // stack footprint, making it suitable for use in demangling Rust symbol names // from a signal handler. absl::Nullable<char*> DecodeRustPunycode(DecodeRustPunycodeOptions options); } // namespace debugging_internal ABSL_NAMESPACE_END } // namespace absl #endif // ABSL_DEBUGGING_INTERNAL_DECODE_RUST_PUNYCODE_H_