Create API to retrieve version number

- Added VERSION macro to Makefile, set to 0x010000 (1.0.0).
- Updated libvinput compilation flags to include VERSION=$(VERSION) for
  all platforms.
- Modified the installation script to remove existing versions of
  libvinput.so and create a symbolic link with the new version number.
- Included VInput_version() function in libvinput.h to return the
  current library version.

Signed-off-by: Slendi <slendi@socopon.com>

Makefile

@@ -1,17 +1,18 @@
 CFLAGS = -I. -Wall -Wextra -O0 -ggdb #-O3
+VERSION = 0x010000
 
 # Linux/X11
 ifeq ($(shell uname), Linux)
 all: wordlogger
 
 libvinput.so: src/libvinput.c src/linux_emu.c src/linux.c
-	$(CC) $(CFLAGS) -fPIC -o $@ -shared $^ -lm -lX11 -lXtst -I/usr/local/include -Isrc -L/usr/local/lib -lxdo
+	$(CC) $(CFLAGS) -DVERSION=$(VERSION) -fPIC -o $@ -shared $^ -lm -lX11 -lXtst -I/usr/local/include -Isrc -L/usr/local/lib -lxdo
 
 wordlogger: wordlogger.c libvinput.so
 	$(CC) $(CFLAGS) wordlogger.c -o $@ -L. -lvinput -lX11 -lXtst -I/usr/local/include -Isrc -L/usr/local/lib -lxdo
 
 install: libvinput.so
-	install -m 777 libvinput.so /usr/local/lib
+	rm -f /usr/local/lib/libvinput.* && install -m 777 libvinput.so /usr/local/lib && mv /usr/local/lib/libvinput.so /usr/local/lib/libvinput.so.$(VERSION) && ln -s /usr/local/lib/libvinput.so.$(VERSION) /usr/local/lib/libvinput.so
 	install -m 644 src/libvinput.h /usr/local/include
 	install -m 644 libvinput.pc /usr/local/lib/pkgconfig
 
@@ -25,7 +26,7 @@ ifeq ($(shell uname), Darwin)
 all: wordlogger_mac
 
 libvinput.dylib: src/libvinput.c src/macos_emu.c src/macos.c
-	$(CC) $(CFLAGS) -fPIC -framework ApplicationServices -framework Carbon -o $@ -shared $^
+	$(CC) $(CFLAGS) -DVERSION=$(VERSION) -fPIC -framework ApplicationServices -framework Carbon -o $@ -shared $^
 
 wordlogger_mac: wordlogger.c libvinput.dylib
 	$(CC) $(CFLAGS) wordlogger.c -o $@ -Isrc -L. -lvinput -Wl,-rpath,@loader_path/.
@@ -44,13 +45,13 @@ libvinput.dll: libvinput.obj windows_emu.obj windows.obj
 	link /DLL /OUT:libvinput.dll libvinput.obj windows_emu.obj windows.obj User32.lib Kernel32.lib
 
 libvinput.obj: src/libvinput.c
-	cl /LD /I src /DBUILDING_VINPUT /Fo$@ /c src\libvinput.c
+	cl /D VERSION= $(VERSION) /LD /I src /DBUILDING_VINPUT /Fo$@ /c src\libvinput.c
 
 windows_emu.obj: src/windows_emu.c
-	cl /LD /I src /DBUILDING_VINPUT /Fo$@ /c src\windows_emu.c
+	cl /D VERSION= $(VERSION) /LD /I src /DBUILDING_VINPUT /Fo$@ /c src\windows_emu.c
 
 windows.obj: src/windows.c
-	cl /LD /I src /DBUILDING_VINPUT /Fo$@ /c src\windows.c
+	cl /D VERSION= $(VERSION) /LD /I src /DBUILDING_VINPUT /Fo$@ /c src\windows.c
 
 vinput.lib: libvinput.obj windows_emu.obj windows.obj
 	lib /OUT:vinput.lib libvinput.obj windows_emu.obj windows.obj
@@ -66,7 +67,7 @@ ifeq ($(OS), MINGW)
 all: wordlogger.exe libvinput.dll
 
 libvinput.dll: src/libvinput.c src/windows_emu.c src/windows.c
-	x86_64-w64-mingw32-gcc $(CFLAGS) -shared -o $@ $^ -DWINVER=0x0600 -luser32 -lkernel32
+	x86_64-w64-mingw32-gcc $(CFLAGS) -DVERSION=$(VERSION) -shared -o $@ $^ -DWINVER=0x0600 -luser32 -lkernel32
 
 wordlogger.exe: wordlogger.c libvinput.dll
 	x86_64-w64-mingw32-gcc $(CFLAGS) -o $@ wordlogger.c -L. -lvinput -DWINVER=0x0600 -luser32 -lkernel32

src/libvinput.c

@@ -59,3 +59,8 @@ VINPUT_PUBLIC VInputError EventEmulator_create(EventEmulator *emulator)
 {
 	return _EventEmulator_init(emulator);
 }
+
+VINPUT_PUBLIC uint32_t VInput_version(void)
+{
+	return VERSION;
+}

src/libvinput.h

@@ -29,6 +29,10 @@ extern "C" {
 #include <stddef.h>
 #include <stdint.h>
 
+#define VINPUT_VERSION_MAJOR(x) (((x) & 0xff0000) >> 16)
+#define VINPUT_VERSION_MINOR(x) (((x) & 0xff00) >> 8)
+#define VINPUT_VERSION_PATCH(x) ((x) & 0xff)
+
 // Currently, only used by the EventListener.
 typedef struct _KeyboardModifiers
 {
@@ -139,6 +143,7 @@ typedef EventEmulator Emulator;
 
 VINPUT_PUBLIC bool VInput_modifier_pressed_except_shift(KeyboardModifiers modifiers);
 
+VINPUT_PUBLIC uint32_t VInput_version(void);
 VINPUT_PUBLIC char const *VInput_error_get_message(VInputError error);
 
 // Create a EventListener, does not allocate memory for the listener.

wordlogger.c

@@ -96,9 +96,13 @@ int main(void)
 #else
 	// signal(SIGINT, signal_handler);
 	signal(SIGTERM, signal_handler);
-
 #endif
 
+	uint32_t version = VInput_version();
+	printf("VInput version: %d.%d.%d\n", VINPUT_VERSION_MAJOR(version),
+	    VINPUT_VERSION_MINOR(version), VINPUT_VERSION_PATCH(version));
+	fflush(stdout);
+
 	VInputError status = EventListener2_create(&g_listener, true, true, true);
 	if (status != VINPUT_OK) {
 		fprintf(stderr, "ERROR: Failed to create keyboard listener! Error: %s",