From 2c45abbc3bfd7c4963db148b489d9f3468fc801b Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 16 Sep 2023 12:46:08 +0300
Subject: [PATCH] Add a function to retrieve temporary directory location

MacOS and Android versions are untested.
---
 source/fs/android/dir_location.cpp |  6 ++++++
 source/fs/dir.h                    |  3 +++
 source/fs/osx/cfdir.m              |  9 +++++++++
 source/fs/osx/dir_location.cpp     | 15 +++++++++++++++
 source/fs/unix/dir_location.cpp    |  8 ++++++++
 source/fs/windows/dir_location.cpp |  8 ++++++++
 6 files changed, 49 insertions(+)

diff --git a/source/fs/android/dir_location.cpp b/source/fs/android/dir_location.cpp
index 155d147..24066f9 100644
--- a/source/fs/android/dir_location.cpp
+++ b/source/fs/android/dir_location.cpp
@@ -18,5 +18,11 @@ Path get_user_data_dir()
 	return thread->get_internal_data_path();
 }
 
+Path get_temp_dir()
+{
+	// TODO Should use Context.getCacheDir(), but it's a Java function.
+	return get_home_dir();
+}
+
 } // namespace FS
 } // namespace Msp
diff --git a/source/fs/dir.h b/source/fs/dir.h
index 960be2e..e9cccfc 100644
--- a/source/fs/dir.h
+++ b/source/fs/dir.h
@@ -56,6 +56,9 @@ MSPCORE_API Path get_sys_data_dir();
 /// Returns a directory containing system-wide architecture-specific files.
 MSPCORE_API Path get_sys_lib_dir();
 
+/// Returns a directory suitable for storing temporary files.
+MSPCORE_API Path get_temp_dir();
+
 /** Looks for a file in a list of paths.  Returns the absolute path to the
 first existing location, or an empty Path if the file is not found at all. */
 MSPCORE_API Path path_lookup(const std::string &, const std::vector<Path> &);
diff --git a/source/fs/osx/cfdir.m b/source/fs/osx/cfdir.m
index 4dd4b4b..b21a0ac 100644
--- a/source/fs/osx/cfdir.m
+++ b/source/fs/osx/cfdir.m
@@ -21,3 +21,12 @@ unsigned get_application_support_dir(char *buf, unsigned size)
 
 	return [path lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
 }
+
+unsigned get_temp_dir(char *buf, unsigned size)
+{
+	NSString *path = NSTemporaryDirectory();
+	if(![path getCString:buf maxLength:size encoding:NSUTF8StringEncoding])
+		return 0;
+
+	return [path lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
+}
diff --git a/source/fs/osx/dir_location.cpp b/source/fs/osx/dir_location.cpp
index 13aa3d2..51ddd4f 100644
--- a/source/fs/osx/dir_location.cpp
+++ b/source/fs/osx/dir_location.cpp
@@ -7,6 +7,7 @@ using namespace std;
 
 extern "C" unsigned get_home_dir(char *, unsigned);
 extern "C" unsigned get_application_support_dir(char *, unsigned);
+extern "C" unsigned get_temp_dir(char *, unsigned);
 
 namespace Msp {
 namespace FS {
@@ -38,5 +39,19 @@ Path get_user_data_dir()
 	return get_home_dir()/"Library"/"Application Support"/appname;
 }
 
+Path get_temp_dir()
+{
+	string tmp = getenv("TMPDIR");
+	if(!tmp.empty())
+		return tmp;
+
+	char buf[1024];
+	unsigned len = ::get_temp_dir(buf, sizeof(buf));
+	if(len)
+		return string(buf, len);
+
+	return "/tmp";
+}
+
 } // namespace FS
 } // namespace Msp
diff --git a/source/fs/unix/dir_location.cpp b/source/fs/unix/dir_location.cpp
index 68d82a2..b66c788 100644
--- a/source/fs/unix/dir_location.cpp
+++ b/source/fs/unix/dir_location.cpp
@@ -25,5 +25,13 @@ Path get_user_data_dir()
 	return get_home_dir()/("."+appname);
 }
 
+Path get_temp_dir()
+{
+	string tmp = getenv("TMPDIR");
+	if(!tmp.empty())
+		return tmp;
+	return "/tmp";
+}
+
 } // namespace FS
 } // namespace Msp
diff --git a/source/fs/windows/dir_location.cpp b/source/fs/windows/dir_location.cpp
index 85c5c2f..5f47a7c 100644
--- a/source/fs/windows/dir_location.cpp
+++ b/source/fs/windows/dir_location.cpp
@@ -28,5 +28,13 @@ Path get_user_data_dir()
 	return ".";
 }
 
+Path get_temp_dir()
+{
+	char temp[MAX_PATH+1];
+	if(GetTempPath(sizeof(temp), temp))
+		return temp;
+	return ".";
+}
+
 } // namespace FS
 } // namespace Msp
-- 
2.45.2