Add 'contrib/catch2/' from commit 'bc524d70253a4ab2fe40c3ca3e5666e267c0a4d1'

git-subtree-dir: contrib/catch2
git-subtree-mainline: a8b0ea58e60bb0326b7f7c8f3c736d89ce9ef1df
git-subtree-split: bc524d70253a4ab2fe40c3ca3e5666e267c0a4d1

1 files changed, 53 insertions, 0 deletions

diff --git a/contrib/catch2/fuzzing/fuzz_textflow.cpp b/contrib/catch2/fuzzing/fuzz_textflow.cpp
new file mode 100644
index 0000000..7000f42
--- /dev/null
+++ b/contrib/catch2/fuzzing/fuzz_textflow.cpp
@@ -0,0 +1,53 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+//By Paul Dreik 2020
+
+#include <catch2/internal/catch_textflow.hpp>
+
+#include "NullOStream.h"
+
+#include <string>
+#include <string_view>
+
+
+template<class Callback>
+void split(const char *Data, size_t Size, Callback callback) {
+
+    using namespace std::literals;
+    constexpr auto sep="\n~~~\n"sv;
+
+    std::string_view remainder(Data,Size);
+    for (;;) {
+        auto pos=remainder.find(sep);
+        if(pos==std::string_view::npos) {
+            //not found. use the remainder and exit
+            callback(remainder);
+            return;
+        } else {
+            //found. invoke callback on the first part, then proceed with the rest.
+            callback(remainder.substr(0,pos));
+            remainder=remainder.substr(pos+sep.size());
+        }
+    }
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+
+    Catch::TextFlow::Columns columns;
+
+    // break the input on separator
+    split((const char*)Data,Size,[&](std::string_view word) {
+        columns+=Catch::TextFlow::Column(std::string(word));
+    });
+
+    NullOStream nul;
+    nul << columns;
+
+    return 0;
+}
+