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Add fuzzing of try_scientific_to_int to CI
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‎.github/workflows/ci.yml‎

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# https://github.com/llvm/llvm-project/issues/59827: disabled 2b/23 for clang-17 with libstdc++13 in 24.04
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- { compiler: clang-17, cxxstd: '11,14,17,20', os: ubuntu-24.04 }
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- { compiler: clang-18, cxxstd: '11,14,17,20,23,2c', os: ubuntu-24.04 }
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- { compiler: clang-18, cxxstd: '20', os: ubuntu-24.04, fuzzing: yes }
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# libc++
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- { compiler: clang-6.0, cxxstd: '11,14', os: ubuntu-22.04, container: 'ubuntu:18.04', stdlib: libc++, install: 'clang-6.0 libc++-dev libc++abi-dev' }
@@ -368,6 +369,10 @@ jobs:
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COVERITY_SCAN_NOTIFICATION_EMAIL: ${{ secrets.COVERITY_SCAN_NOTIFICATION_EMAIL }}
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COVERITY_SCAN_TOKEN: ${{ secrets.COVERITY_SCAN_TOKEN }}
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- name: Run fuzzing
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if: matrix.fuzzing == 'yes'
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run: B2_TARGETS="libs/$SELF/fuzzing" ci/build.sh
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windows:
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defaults:
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run:

‎fuzzing/Jamfile‎

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# Copyright (c) 2024 Matt Borland
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# Copyright (c) 2025 Alexander Grund
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#
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# Distributed under the Boost Software License, Version 1.0.
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# https://www.boost.org/LICENSE_1_0.txt.
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import common ;
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import regex ;
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local all_fuzzers = [ regex.replace-list
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[ glob "fuzz_*.cpp" ] : ".cpp" : ""
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] ;
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for local fuzzer in $(all_fuzzers)
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{
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local fuzz_time = 60 ;
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# Create the output corpus directories
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make /tmp/corpus/$(fuzzer) : : common.MkDir ;
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make /tmp/mincorpus/$(fuzzer) : : common.MkDir ;
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# Build the fuzzer
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exe $(fuzzer)
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:
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$(fuzzer).cpp
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: requirements
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<debug-symbols>on
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<optimization>speed
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<address-sanitizer>on
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<undefined-sanitizer>norecover
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<cxxflags>-fsanitize=fuzzer
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<linkflags>-fsanitize=fuzzer
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<library>/boost/locale//boost_locale
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;
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# Run the fuzzer for a short while
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run $(fuzzer)
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: <testing.arg>"seedcorpus/$(fuzzer) -max_total_time=$(fuzz_time)"
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: target-name $(fuzzer)-fuzzing
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: requirements
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<dependency>/tmp/corpus/$(fuzzer)
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;
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# Minimize the corpus
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run $(fuzzer)
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: <testing.arg>"/tmp/mincorpus/$(fuzzer) /tmp/corpus/$(fuzzer) -merge=1"
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: target-name $(fuzzer)-minimize-corpus
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: requirements
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<dependency>$(fuzzer)-fuzzing
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<dependency>/tmp/corpus/$(fuzzer)
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<dependency>/tmp/mincorpus/$(fuzzer)
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;
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}

‎fuzzing/fuzz_scientific_to_int.cpp‎

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//
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// Copyright (c) 2025 Alexander Grund
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//
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include "../src/util/numeric_conversion.hpp"
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#include <boost/charconv.hpp>
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#include <boost/core/detail/string_view.hpp>
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#include <cstdint>
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#include <exception>
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#include <iostream>
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extern "C" int LLVMFuzzerTestOneInput(const std::uint8_t* data, std::size_t size)
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{
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using boost::locale::util::try_scientific_to_int;
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try {
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const boost::core::string_view sv{reinterpret_cast<const char*>(data), size};
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uint8_t u8{};
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try_scientific_to_int(sv, u8);
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uint16_t u16{};
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try_scientific_to_int(sv, u16);
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uint32_t u32{};
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try_scientific_to_int(sv, u32);
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uint8_t u64{};
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try_scientific_to_int(sv, u64);
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} catch(...) {
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std::cerr << "Error with: " << data << std::endl;
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std::terminate();
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}
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return 0;
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}

‎fuzzing/seedcorpus/fuzz_scientific_to_int/scientific_to_int.txt‎

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1
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1E0
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10
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5.5e1

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