honor the $XDG_CACHE_HOME env variable

DescentDevelopers · Oct 9, 2024 · 40dcb60 · 40dcb60
1 parent 48c8775
commit 40dcb60
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Showing 3 changed files with 34 additions and 7 deletions.
diff --git a/Descent3/init.cpp b/Descent3/init.cpp
@@ -1957,13 +1957,7 @@ void SetupTempDirectory(void) {
   if (t_arg) {
     Descent3_temp_directory = GameArgs[t_arg + 1];
   } else {
-    std::error_code ec;
-    std::filesystem::path tempPath = std::filesystem::temp_directory_path(ec);
-    if (ec) {
-      Error("Could not find temporary directory: \"%s\"", ec.message().c_str() );
-      exit(1);
-    }
-    Descent3_temp_directory = tempPath / "Descent3" / "cache";
+    Descent3_temp_directory = ddio_GetTempPath();
   }
 
   std::error_code ec;

diff --git a/ddio/ddio.h b/ddio/ddio.h
@@ -412,4 +412,10 @@ bool ddio_CreateLockFile(const std::filesystem::path &dir);
  */
 bool ddio_DeleteLockFile(const std::filesystem::path &dir);
 
+/**
+ * Gets path where to write temporary/cache files.
+ * @return path where user can write cache files.
+ */
+std::filesystem::path ddio_GetTempPath();
+
 #endif
diff --git a/ddio/file.cpp b/ddio/file.cpp
@@ -192,3 +192,30 @@ std::filesystem::path ddio_GetTmpFileName(const std::filesystem::path &basedir,
   mem_free(random_name);
   return result;
 }
+
+std::filesystem::path ddio_GetTempPath() {
+  std::filesystem::path result;
+
+#if defined(POSIX)
+  char *envr = SDL_getenv("XDG_CACHE_HOME");
+  if (envr) {
+    result = std::filesystem::path(envr) / "Descent3";
+  } else {
+    envr = SDL_getenv("HOME");
+    if (envr) {
+      result = std::filesystem::path(envr) / ".cache" / "Descent3";
+    } else {
+#endif
+      std::error_code ec;
+      std::filesystem::path tempPath = std::filesystem::temp_directory_path(ec);
+      if (ec) {
+        Error("Could not find temporary directory: \"%s\"", ec.message().c_str() );
+        exit(1);
+      }
+      result = tempPath / "Descent3" / "cache";
+#if defined(POSIX)
+    }
+  }
+#endif
+  return result;
+}