Codechange: Drop libxdg-basedir dependency in favour of finding the directories ourselves

6 files changed, 64 insertions, 113 deletions

diff --git a/.github/workflows/ci-build.yml b/.github/workflows/ci-build.yml
index 8794b79da..08f3a7a19 100644
--- a/.github/workflows/ci-build.yml
+++ b/.github/workflows/ci-build.yml
@@ -94,7 +94,6 @@ jobs:
           liblzo2-dev \
           libsdl1.2-dev \
           libsdl2-dev \
-          libxdg-basedir-dev \
           zlib1g-dev \
           # EOF
         echo "::endgroup::"
diff --git a/CMakeLists.txt b/CMakeLists.txt
index bbde268c4..186e0b8b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -122,7 +122,6 @@ if(NOT WIN32)
         find_package(Fluidsynth)
         find_package(Fontconfig)
         find_package(ICU OPTIONAL_COMPONENTS i18n lx)
-        find_package(XDG_basedir)
     else()
         find_package(Iconv)
 
@@ -208,7 +207,6 @@ link_package(PNG TARGET PNG::PNG ENCOURAGED)
 link_package(ZLIB TARGET ZLIB::ZLIB ENCOURAGED)
 link_package(LIBLZMA TARGET LibLZMA::LibLZMA ENCOURAGED)
 link_package(LZO)
-link_package(XDG_basedir)
 
 if(NOT OPTION_DEDICATED)
     link_package(Fluidsynth)
diff --git a/cmake/FindXDG_basedir.cmake b/cmake/FindXDG_basedir.cmake
deleted file mode 100644
index a33e9760d..000000000
--- a/cmake/FindXDG_basedir.cmake
+++ /dev/null
@@ -1,65 +0,0 @@
-#[=======================================================================[.rst:
-FindXDG_basedir
--------
-
-Finds the xdg-basedir library.
-
-Result Variables
-^^^^^^^^^^^^^^^^
-
-This will define the following variables:
-
-``XDG_basedir_FOUND``
-  True if the system has the xdg-basedir library.
-``XDG_basedir_INCLUDE_DIRS``
-  Include directories needed to use xdg-basedir.
-``XDG_basedir_LIBRARIES``
-  Libraries needed to link to xdg-basedir.
-``XDG_basedir_VERSION``
-  The version of the xdg-basedir library which was found.
-
-Cache Variables
-^^^^^^^^^^^^^^^
-
-The following cache variables may also be set:
-
-``XDG_basedir_INCLUDE_DIR``
-  The directory containing ``xdg-basedir.h``.
-``XDG_basedir_LIBRARY``
-  The path to the xdg-basedir library.
-
-#]=======================================================================]
-
-find_package(PkgConfig QUIET)
-pkg_check_modules(PC_XDG_basedir QUIET libxdg-basedir)
-
-find_path(XDG_basedir_INCLUDE_DIR
-    NAMES basedir.h
-    PATHS ${PC_XDG_basedir_INCLUDE_DIRS}
-)
-
-find_library(XDG_basedir_LIBRARY
-    NAMES xdg-basedir
-    PATHS ${PC_XDG_basedir_LIBRARY_DIRS}
-)
-
-set(XDG_basedir_VERSION ${PC_XDG_basedir_VERSION})
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(XDG_basedir
-    FOUND_VAR XDG_basedir_FOUND
-    REQUIRED_VARS
-        XDG_basedir_LIBRARY
-        XDG_basedir_INCLUDE_DIR
-    VERSION_VAR XDG_basedir_VERSION
-)
-
-if(XDG_basedir_FOUND)
-    set(XDG_basedir_LIBRARIES ${XDG_basedir_LIBRARY})
-    set(XDG_basedir_INCLUDE_DIRS ${XDG_basedir_INCLUDE_DIR})
-endif()
-
-mark_as_advanced(
-    XDG_basedir_INCLUDE_DIR
-    XDG_basedir_LIBRARY
-)
diff --git a/src/fileio.cpp b/src/fileio.cpp
index cba18873a..44f2cf5c7 100644
--- a/src/fileio.cpp
+++ b/src/fileio.cpp
@@ -28,10 +28,6 @@
 #include <array>
 #include <sstream>
 
-#ifdef WITH_XDG_BASEDIR
-#include <basedir.h>
-#endif
-
 #include "safeguards.h"
 
 /** Size of the #Fio data buffer. */
@@ -978,54 +974,65 @@ bool DoScanWorkingDirectory()
 }
 
 /**
+ * Gets the home directory of the user.
+ * May return an empty string in the unlikely scenario that the home directory cannot be found.
+ * @return User's home directory
+ */
+static std::string GetHomeDir()
+{
+#ifdef __HAIKU__
+	BPath path;
+	find_directory(B_USER_SETTINGS_DIRECTORY, &path);
+	return std::string(path.Path());
+#else
+	const char *home_env = getenv("HOME"); // Stack var, shouldn't be freed
+	if (home_env != nullptr) return std::string(home_env);
+
+	const struct passwd *pw = getpwuid(getuid());
+	if (pw != nullptr) return std::string(pw->pw_dir);
+#endif
+	return {};
+}
+
+/**
  * Determine the base (personal dir and game data dir) paths
  * @param exe the path to the executable
  */
 void DetermineBasePaths(const char *exe)
 {
 	std::string tmp;
-#if defined(WITH_XDG_BASEDIR) && defined(WITH_PERSONAL_DIR)
-	const char *xdg_data_home = xdgDataHome(nullptr);
-	tmp = xdg_data_home;
-	tmp += PATHSEP;
-	tmp += PERSONAL_DIR[0] == '.' ? &PERSONAL_DIR[1] : PERSONAL_DIR;
-	free(xdg_data_home);
+	const std::string homedir = GetHomeDir();
+#ifdef USE_XDG
+	const char *xdg_data_home = getenv("XDG_DATA_HOME");
+	if (xdg_data_home != nullptr) {
+		tmp = xdg_data_home;
+		tmp += PATHSEP;
+		tmp += PERSONAL_DIR[0] == '.' ? &PERSONAL_DIR[1] : PERSONAL_DIR;
+		AppendPathSeparator(tmp);
 
-	AppendPathSeparator(tmp);
-	_searchpaths[SP_PERSONAL_DIR_XDG] = tmp;
-#endif
-#if defined(OS2) || !defined(WITH_PERSONAL_DIR)
-	_searchpaths[SP_PERSONAL_DIR].clear();
-#else
-#ifdef __HAIKU__
-	BPath path;
-	find_directory(B_USER_SETTINGS_DIRECTORY, &path);
-	const char *homedir = stredup(path.Path());
-#else
-	/* getenv is highly unsafe; duplicate it as soon as possible,
-	 * or at least before something else touches the environment
-	 * variables in any way. It can also contain all kinds of
-	 * unvalidated data we rather not want internally. */
-	const char *homedir = getenv("HOME");
-	if (homedir != nullptr) {
-		homedir = stredup(homedir);
-	}
+		_searchpaths[SP_PERSONAL_DIR_XDG] = tmp;
+	} else if (!homedir.empty()) {
+		tmp = homedir;
+		tmp += PATHSEP ".local" PATHSEP "share" PATHSEP;
+		tmp += PERSONAL_DIR[0] == '.' ? &PERSONAL_DIR[1] : PERSONAL_DIR;
+		AppendPathSeparator(tmp);
 
-	if (homedir == nullptr) {
-		const struct passwd *pw = getpwuid(getuid());
-		homedir = (pw == nullptr) ? nullptr : stredup(pw->pw_dir);
+		_searchpaths[SP_PERSONAL_DIR_XDG] = tmp;
+	} else {
+		_searchpaths[SP_PERSONAL_DIR_XDG].clear();
 	}
 #endif
 
-	if (homedir != nullptr) {
-		ValidateString(homedir);
+#if defined(OS2) || !defined(WITH_PERSONAL_DIR)
+	_searchpaths[SP_PERSONAL_DIR].clear();
+#else
+	if (!homedir.empty()) {
 		tmp = homedir;
 		tmp += PATHSEP;
 		tmp += PERSONAL_DIR;
 		AppendPathSeparator(tmp);
 
 		_searchpaths[SP_PERSONAL_DIR] = tmp;
-		free(homedir);
 	} else {
 		_searchpaths[SP_PERSONAL_DIR].clear();
 	}
@@ -1111,13 +1118,20 @@ void DeterminePaths(const char *exe)
 {
 	DetermineBasePaths(exe);
 
-#if defined(WITH_XDG_BASEDIR) && defined(WITH_PERSONAL_DIR)
-	const char *xdg_config_home = xdgConfigHome(nullptr);
-	std::string config_home(xdg_config_home);
-	config_home += PATHSEP;
-	config_home += PERSONAL_DIR[0] == '.' ? &PERSONAL_DIR[1] : PERSONAL_DIR;
-	free(xdg_config_home);
-
+#ifdef USE_XDG
+	std::string config_home;
+	const std::string homedir = GetHomeDir();
+	const char *xdg_config_home = getenv("XDG_CONFIG_HOME");
+	if (xdg_config_home != nullptr) {
+		config_home = xdg_config_home;
+		config_home += PATHSEP;
+		config_home += PERSONAL_DIR[0] == '.' ? &PERSONAL_DIR[1] : PERSONAL_DIR;
+	} else if (!homedir.empty()) {
+		/* Defaults to ~/.config */
+		config_home = homedir;
+		config_home += PATHSEP ".config" PATHSEP;
+		config_home += PERSONAL_DIR[0] == '.' ? &PERSONAL_DIR[1] : PERSONAL_DIR;
+	}
 	AppendPathSeparator(config_home);
 #endif
 
@@ -1137,7 +1151,7 @@ void DeterminePaths(const char *exe)
 			if (end != std::string::npos) personal_dir.erase(end + 1);
 			config_dir = personal_dir;
 		} else {
-#if defined(WITH_XDG_BASEDIR) && defined(WITH_PERSONAL_DIR)
+#ifdef USE_XDG
 			/* No previous configuration file found. Use the configuration folder from XDG. */
 			config_dir = config_home;
 #else
@@ -1165,7 +1179,7 @@ void DeterminePaths(const char *exe)
 	extern std::string _windows_file;
 	_windows_file = config_dir + "windows.cfg";
 
-#if defined(WITH_XDG_BASEDIR) && defined(WITH_PERSONAL_DIR)
+#ifdef USE_XDG
 	if (config_dir == config_home) {
 		/* We are using the XDG configuration home for the config file,
 		 * then store the rest in the XDG data home folder. */
diff --git a/src/fileio_type.h b/src/fileio_type.h
index 62147f9e6..17be6d60f 100644
--- a/src/fileio_type.h
+++ b/src/fileio_type.h
@@ -131,7 +131,7 @@ enum Subdirectory {
 enum Searchpath : unsigned {
 	SP_FIRST_DIR,
 	SP_WORKING_DIR = SP_FIRST_DIR, ///< Search in the working directory
-#if defined(WITH_XDG_BASEDIR) && defined(WITH_PERSONAL_DIR)
+#ifdef USE_XDG
 	SP_PERSONAL_DIR_XDG,           ///< Search in the personal directory from the XDG specification
 #endif
 	SP_PERSONAL_DIR,               ///< Search in the personal directory
diff --git a/src/stdafx.h b/src/stdafx.h
index dca0e6c6f..12d4fa81d 100644
--- a/src/stdafx.h
+++ b/src/stdafx.h
@@ -348,6 +348,11 @@ typedef unsigned char byte;
 #	define PERSONAL_DIR ""
 #endif
 
+/* Define the the platforms that use XDG */
+#if defined(WITH_PERSONAL_DIR) && defined(UNIX) && !defined(__APPLE__)
+#	define USE_XDG
+#endif
+
 /* Check if the types have the bitsizes like we are using them */
 static_assert(sizeof(uint64) == 8);
 static_assert(sizeof(uint32) == 4);