Add script to automate AFL fuzzing.

c++/afl-fuzz.sh

+#! /bin/bash
+
+set -euo pipefail
+
+echo "Choose test case:"
+echo "1) TestAllTypes parsing"
+echo "2) TestLists parsing"
+echo "3) Canonicalization"
+
+read -p "choice: " -n 1 TESTCASE
+echo
+
+case "$TESTCASE" in
+  1 )
+    TESTDATA=binary
+    FLAGS=
+    TESTNAME=default
+    ;;
+  2 )
+    TESTDATA=lists.binary
+    FLAGS=--lists
+    TESTNAME=lists
+    ;;
+  3 )
+    TESTDATA=binary
+    FLAGS=--canonicalize
+    TESTNAME=canonicalize
+    ;;
+  * )
+    echo "Invalid choice: $TESTCASE" >&2
+    exit 1
+esac
+
+echo "Choose compiler:"
+echo "1) GCC"
+echo "2) Clang"
+
+read -p "choice: " -n 1 TESTCASE
+echo
+
+case "$TESTCASE" in
+  1 )
+    export CXX=afl-g++
+    ;;
+  2 )
+    export CXX=afl-clang++
+    ;;
+  * )
+    echo "Invalid choice: $TESTCASE" >&2
+    exit 1
+esac
+
+if [ -e Makefile ]; then
+  if ! grep -q '^CXX *= *'"$CXX" Makefile; then
+    # Wrong complier used.
+    make distclean
+    $(dirname $0)/configure --disable-shared
+  fi
+else
+  $(dirname $0)/configure --disable-shared
+fi
+
+make -j$(nproc)
+make -j$(nproc) capnp-afl-testcase
+
+NOW=$(date +%Y-%m-%d.%H-%M-%S).$TESTNAME.$CXX
+
+mkdir afl.$NOW.inputs afl.$NOW.findings
+
+cp $(dirname $0)/src/capnp/testdata/$TESTDATA afl.$NOW.inputs
+
+afl-fuzz -i afl.$NOW.inputs -o afl.$NOW.findings -- ./capnp-afl-testcase $FLAGS