test fuzzer

src/frontend_common/config.cpp

@@ -245,13 +245,14 @@ void Config::ReadMotionTouchValues() {
 
             Settings::TouchFromButtonMap map;
             map.name = ReadStringSetting(std::string("name"), std::string("default"));
-
-            const int num_touch_maps = BeginArray(std::string("entries"));
-            map.buttons.reserve(num_touch_maps);
-            for (int j = 0; j < num_touch_maps; j++) {
-                SetArrayIndex(j);
-                std::string touch_mapping = ReadStringSetting(std::string("bind"));
-                map.buttons.emplace_back(std::move(touch_mapping));
+            int const num_touch_maps = BeginArray(std::string("entries"));
+            if (num_touch_maps > 0) {
+                map.buttons.reserve(num_touch_maps);
+                for (int j = 0; j < num_touch_maps; j++) {
+                    SetArrayIndex(j);
+                    std::string touch_mapping = ReadStringSetting(std::string("bind"));
+                    map.buttons.emplace_back(std::move(touch_mapping));
+                }
             }
             EndArray(); // entries
             Settings::values.touch_from_button_maps.emplace_back(std::move(map));
@@ -1049,8 +1050,7 @@ std::string Config::GetFullKey(const std::string& key, bool skipArrayIndex) {
 
 int Config::BeginArray(const std::string& array) {
     array_stack.push_back(ConfigArray{AdjustKey(array), 0, 0});
-    const int size = config->GetLongValue(GetSection().c_str(),
-                                          GetFullKey(std::string("size"), true).c_str(), 0);
+    const int size = config->GetLongValue(GetSection().c_str(), GetFullKey(std::string("size"), true).c_str(), 0);
     array_stack.back().size = size;
     return size;
 }

tools/fuzzsettings.cpp

@@ -0,0 +1,56 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <cstdio>
+#include <cstdlib>
+#include <cctype>
+#include <cstring>
+#include <ctime>
+#include <string>
+#include <string_view>
+
+int main(int argc, char *argv[]) {
+    std::srand(unsigned(std::time(nullptr)));
+
+    FILE *fp = std::fopen(argv[1], "rt");
+    if (fp) {
+        char line[BUFSIZ];
+        while (std::fgets(line, sizeof(line), fp)) {
+            if (line[0] == '[') {
+                std::printf("%s", line);
+            } else if (std::isspace(line[0])) {
+                std::printf("%s", line);
+            } else {
+                char *p = std::strchr(line, '=');
+                if (std::strstr(line, "\\default") == nullptr) {
+                    // not default
+                    *p = '\0';
+                    std::string new_line{line};
+                    std::string value{p + 1};
+                    if (value == "true" || value == "false") {
+                        new_line += std::string{} + "=TreufLAlse857874FJJakshjryiu475" + '\n';
+                    } else if (std::isdigit(value[0])) {
+                        if (new_line == "size" || std::strstr(new_line.c_str(), "entries\\size") != nullptr) {
+                            new_line += "=-1\n";
+                        } else {
+                            new_line += '=' + std::to_string(int(std::rand())) + '\n';
+                        }
+                    } else {
+                        std::string_view const cset{"03832///1/1/.1/1./1./1./1.1/.1194573290uwmgjouidyhiomHMNIODASJK,POF MSHDVLJPOIuksdtpsunmghns"};
+                        std::string rst{"000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"};
+                        for (size_t i = 0; i < rst.size(); ++i)
+                            rst[i] = cset[std::rand() % cset.size()];
+
+                        //new_line += "=\"" + rst + "\"";
+                        new_line += "=" + value;
+                    }
+                    std::printf("%s", new_line.c_str());
+                } else {
+                    std::printf("%s", line);
+                }
+            }
+        }
+        std::fclose(fp);
+    }
+    return 0;
+}

tools/fuzzsettings.sh

@@ -0,0 +1,12 @@
+#!/bin/sh -ex
+
+# SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+ROOTDIR=$(CDPATH='' cd -- "$(dirname -- "$0")/" && pwd)
+
+touch "$2"
+
+c++ "$ROOTDIR/fuzzsettings.cpp" -o fuzzsettings
+./fuzzsettings "$1" >"$2"
+rm fuzzsettings