mirror of
https://github.com/nlohmann/json.git
synced 2026-07-27 21:04:55 +00:00
Jonas Greitemann
85839d7408
`std::from_chars` is locale-independent and thus avoids the TOCTOU issue #5198 when it's available. This commit introduces a `from_chars` utility in the `detail` namespace which merely wraps `std::from_chars` if it is available and emulates its API and behavior using the `strto*` family of functions when it is not. As of this commit, the `strto*`-based fallback is still locale-dependent and only matches `std::from_chars` when the "C" locale is used. Availability of `std::from_chars` for floating point numbers is varied. For instance, as of libc++ 22, `std::from_chars` for `long double` isn't supported and, consequently, the feature-test macro `__cpp_lib_to_chars` is not set, while the overloads for `float` and `double` are available. To avoid complicating matters further, the feature-test macro is taken as the authoritative indicator for (full) `std::from_chars` support and the fallback is used otherwise. If `std::from_chars` is available, our wrapper additionally tweaks its output in the case of floating-point out-of-range results. The behavior in this case is poorly (under-)specified and existing implementations do not agree. The wrapper's tweaks are intended to ensure consistent behavior across all toolchains in this edge case. In practice, this should only take effect when parsing out-of-range floats on libstdc++. The unit tests for the `from_chars` helper are intentionally compiled in both C++11 and C++17 modes. This ensures that the test expectations align with the actual behavior we're trying to model. The tests are not aiming to cover all of floating-point parsing comprehensively, as `std::from_chars` is specified to behave mostly the same as `strto*` and instead focuses on the edge cases where the two differ: - leading whitespace is not tolerated - `+` sign is not allowed (outside of the exponent) - out-parameter is left unchanged in case of `invalid_argument` and integral `result_out_of_range` errors Signed-off-by: Jonas Greitemann <jgreitemann@gmail.com>
82 lines
3.2 KiB
Python
82 lines
3.2 KiB
Python
load("@rules_cc//cc:cc_library.bzl", "cc_library")
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load("@rules_license//rules:license.bzl", "license")
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package(
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default_applicable_licenses = [":license"],
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)
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exports_files([
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"LICENSE.MIT",
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])
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license(
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name = "license",
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license_kinds = ["@rules_license//licenses/spdx:MIT"],
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license_text = "LICENSE.MIT",
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)
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cc_library(
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name = "json",
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hdrs = [
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"include/nlohmann/adl_serializer.hpp",
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"include/nlohmann/byte_container_with_subtype.hpp",
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"include/nlohmann/detail/abi_macros.hpp",
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"include/nlohmann/detail/conversions/from_chars.hpp",
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"include/nlohmann/detail/conversions/from_json.hpp",
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"include/nlohmann/detail/conversions/to_chars.hpp",
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"include/nlohmann/detail/conversions/to_json.hpp",
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"include/nlohmann/detail/exceptions.hpp",
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"include/nlohmann/detail/hash.hpp",
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"include/nlohmann/detail/input/binary_reader.hpp",
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"include/nlohmann/detail/input/input_adapters.hpp",
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"include/nlohmann/detail/input/json_sax.hpp",
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"include/nlohmann/detail/input/lexer.hpp",
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"include/nlohmann/detail/input/parser.hpp",
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"include/nlohmann/detail/input/position_t.hpp",
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"include/nlohmann/detail/iterators/internal_iterator.hpp",
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"include/nlohmann/detail/iterators/iter_impl.hpp",
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"include/nlohmann/detail/iterators/iteration_proxy.hpp",
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"include/nlohmann/detail/iterators/iterator_traits.hpp",
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"include/nlohmann/detail/iterators/json_reverse_iterator.hpp",
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"include/nlohmann/detail/iterators/primitive_iterator.hpp",
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"include/nlohmann/detail/json_custom_base_class.hpp",
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"include/nlohmann/detail/json_pointer.hpp",
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"include/nlohmann/detail/json_ref.hpp",
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"include/nlohmann/detail/macro_scope.hpp",
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"include/nlohmann/detail/macro_unscope.hpp",
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"include/nlohmann/detail/meta/call_std/begin.hpp",
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"include/nlohmann/detail/meta/call_std/end.hpp",
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"include/nlohmann/detail/meta/cpp_future.hpp",
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"include/nlohmann/detail/meta/detected.hpp",
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"include/nlohmann/detail/meta/identity_tag.hpp",
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"include/nlohmann/detail/meta/is_sax.hpp",
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"include/nlohmann/detail/meta/std_fs.hpp",
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"include/nlohmann/detail/meta/type_traits.hpp",
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"include/nlohmann/detail/meta/void_t.hpp",
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"include/nlohmann/detail/output/binary_writer.hpp",
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"include/nlohmann/detail/output/output_adapters.hpp",
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"include/nlohmann/detail/output/serializer.hpp",
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"include/nlohmann/detail/string_concat.hpp",
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"include/nlohmann/detail/string_escape.hpp",
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"include/nlohmann/detail/string_utils.hpp",
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"include/nlohmann/detail/value_t.hpp",
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"include/nlohmann/json.hpp",
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"include/nlohmann/json_fwd.hpp",
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"include/nlohmann/ordered_map.hpp",
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"include/nlohmann/thirdparty/hedley/hedley.hpp",
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"include/nlohmann/thirdparty/hedley/hedley_undef.hpp",
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],
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includes = ["include"],
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visibility = ["//visibility:public"],
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alwayslink = True,
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)
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cc_library(
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name = "singleheader-json",
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hdrs = [
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"single_include/nlohmann/json.hpp",
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],
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includes = ["single_include"],
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visibility = ["//visibility:public"],
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)
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