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Fuzz fallback formatter

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This commit is contained in:
Victor Zverovich 2020-11-03 19:34:35 -08:00
parent 6b7bfed40c
commit 49544ea943
1 changed files with 13 additions and 8 deletions
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21
test/fuzzing/float.cc
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@ -9,26 +9,31 @@
#include "fuzzer-common.h"
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
if (size <= sizeof(double) || !std::numeric_limits<double>::is_iec559)
return 0;
auto value = assign_from_buf<double>(data);
void check_round_trip(fmt::string_view format_str, double value) {
auto buffer = fmt::memory_buffer();
fmt::format_to(buffer, "{}", value);
fmt::format_to(buffer, format_str, value);
// Check a round trip.
if (std::isnan(value)) {
auto nan = std::signbit(value) ? "-nan" : "nan";
if (fmt::string_view(buffer.data(), buffer.size()) != nan)
throw std::runtime_error("round trip failure");
return 0;
return;
}
buffer.push_back('\0');
char* ptr = nullptr;
if (std::strtod(buffer.data(), &ptr) != value)
throw std::runtime_error("round trip failure");
if (ptr + 1 != buffer.end())
throw std::runtime_error("unparsed output");
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
if (size <= sizeof(double) || !std::numeric_limits<double>::is_iec559)
return 0;
check_round_trip("{}", assign_from_buf<double>(data));
// A larger than necessary precision is used to trigger the fallback
// formatter.
check_round_trip("{:.50g}", assign_from_buf<double>(data));
return 0;
}