From 011a119ecda46ed50edb9e9ba8002db91e2b5a70 Mon Sep 17 00:00:00 2001
From: mzuenni <michi.zuendorf@gmail.com>
Date: Fri, 2 Aug 2024 15:46:22 +0200
Subject: add fuzz script

---
 test/fuzz.sh | 14 ++++++++++++++
 test/test.sh |  9 +++++++--
 test/util.h  |  6 +++++-
 3 files changed, 26 insertions(+), 3 deletions(-)
 create mode 100755 test/fuzz.sh

(limited to 'test')

diff --git a/test/fuzz.sh b/test/fuzz.sh
new file mode 100755
index 0000000..5b9b9d2
--- /dev/null
+++ b/test/fuzz.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+set -e
+cd "$(dirname "$0")"
+
+while true
+do
+    seed="0"
+    while [[ $seed == 0* ]]; do
+        seed=$(tr -dc '0-9' </dev/random |  head -c 18)
+    done
+    echo "Fuzz using seed: $seed"
+    echo
+    ./test.sh --seed=123 "$@"
+done
diff --git a/test/test.sh b/test/test.sh
index 0ca230b..d34c446 100755
--- a/test/test.sh
+++ b/test/test.sh
@@ -6,6 +6,7 @@ export MALLOC_PERTURB_="$((2#01011001))"
 
 declare -A cppstandard
 cppstandard["string/suffixArray.cpp"]="gnu++20"
+seedmacro=""
 
 test_file() {
     file=$(realpath --relative-to="${PWD}" "${1}")
@@ -15,7 +16,7 @@ test_file() {
     if [[ -v cppstandard[$file] ]]; then
         std=${cppstandard[$file]}
     fi
-    g++ -std=$std "$file" -I ../content/ -O2 -Wall -Wextra -Wshadow -Werror
+    g++ -std=$std "$file" -I ../content/ -O2 -Wall -Wextra -Wshadow -Werror $seedmacro
     echo "running..."
     timeout --foreground 60s ./a.out
     echo ""
@@ -48,8 +49,10 @@ list_missing() {
 if [ "$#" -ne 0 ]; then
     for arg in "$@"
     do
-        if [[ "$arg" == "--missing" ]]; then
+        if [[ $arg == "--missing" ]]; then
             list_missing
+        elif [[ $arg == --seed=* ]]; then
+            seedmacro="-DSEED=${arg:7}ll"
         elif [ -d "$arg" ]; then
             dir=$(realpath --relative-to="${PWD}" "$arg")
             find . -type f -path "./${dir}/*.cpp" -print0 | sort -z | while read -d $'\0' file
@@ -58,6 +61,8 @@ if [ "$#" -ne 0 ]; then
             done
         elif [ -f "$arg" ]; then
             test_file "$arg"
+        else
+            echo "did not recognize: $arg"
         fi
     done
 else
diff --git a/test/util.h b/test/util.h
index bfa35d8..6f23b82 100644
--- a/test/util.h
+++ b/test/util.h
@@ -24,7 +24,11 @@ namespace details {
 }
 
 namespace Random {
-	mt19937_64 rng(3141592653589793238ll);
+	#ifdef SEED
+		mt19937_64 rng(SEED);
+	#else
+		mt19937_64 rng(3141592653589793238ll);
+	#endif
 	template<typename T = ll>
 	T integer(T l, T r) {
 		return uniform_int_distribution<T>(l, r-1)(rng);
-- 
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