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test-libfuzzer-target.c

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+/*
+  Copyright 2019 Google LLC All rights reserved.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at:
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+
+/*
+   american fuzzy lop - a trivial program to test libFuzzer target fuzzing.
+   ------------------------------------------------------------------------
+
+   Initially written and maintained by Michal Zalewski.
+*/
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+
+// TODO(metzman): Create a test/ directory to store this and other similar
+// files.
+int LLVMFuzzerTestOneInput(uint8_t* buf, size_t size) {
+  if (size < 2)
+    return 0;
+
+  if (buf[0] == '0')
+    printf("Looks like a zero to me!\n");
+  else
+    printf("A non-zero value? How quaint!\n");
+
+  return 0;
+}