Merge pull request #184 from silvergasp/main

Adds a simple fuzz test

fuzz/build.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+$CXX $CFLAGS $CXXFLAGS \
+     -I $SRC/fast_float/include \
+     -c $SRC/fast_float/fuzz/from_chars.cc -o from_chars.o
+
+$CXX $CFLAGS $CXXFLAGS $LIB_FUZZING_ENGINE from_chars.o \
+     -o $OUT/from_chars

fuzz/from_chars.cc

@@ -0,0 +1,34 @@
+#include "fast_float/fast_float.h"
+#include <fuzzer/FuzzedDataProvider.h>
+#include <string>
+#include <system_error>
+
+fast_float::chars_format arbitrary_format(FuzzedDataProvider &fdp) {
+    using fast_float::chars_format;
+    switch (fdp.ConsumeIntegralInRange<int>(0,3)) {
+        case 0:
+            return chars_format::scientific;
+            break;
+        case 1:
+            return chars_format::fixed;
+            break;
+        case 2:
+            return chars_format::fixed;
+            break;
+    }
+    return chars_format::general;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  FuzzedDataProvider fdp(data, size);
+  fast_float::chars_format format = arbitrary_format(fdp);
+  double result_d = 0.0;
+  std::string input_d = fdp.ConsumeRandomLengthString(128);
+  auto answer =
+      fast_float::from_chars(input_d.data(), input_d.data() + input_d.size(), result_d, format);
+  std::string input_f = fdp.ConsumeRandomLengthString(128);
+  double result_f = 0.0;
+  answer =
+      fast_float::from_chars(input_f.data(), input_f.data() + input_f.size(), result_f, format);
+  return 0;
+}