A library should expose its version

src/libsodium/Makefile.am

@@ -73,7 +73,8 @@ libsodium_la_SOURCES = \
 	crypto_sign/ed25519/ref/ge25519.h \
 	crypto_sign/ed25519/ref/ge25519_ed25519.c \
 	crypto_sign/ed25519/ref/sc25519.h \
-	crypto_sign/ed25519/ref/sc25519_ed25519.c
+	crypto_sign/ed25519/ref/sc25519_ed25519.c \
+	version.c
 
 libsodium_la_LDFLAGS = \
 	$(AM_LDFLAGS) \

src/libsodium/include/sodium/version.h.in

@@ -1,10 +1,14 @@
 
-#ifndef __NACL_VERSION_H__
-#define __NACL_VERSION_H__
+#ifndef __SODIUM_VERSION_H__
+#define __SODIUM_VERSION_H__
 
-#define NACL_VERSION_STRING "@VERSION@"
+#define SODIUM_VERSION_STRING "@VERSION@"
 
-#define NACL_VERSION_MAJOR 0
-#define NACL_VERSION_MINOR 1
+#define SODIUM_VERSION_MAJOR 0
+#define SODIUM_VERSION_MINOR 1
+
+const char *sodium_version_string(void);
+const int   sodium_version_major(void);
+const int   sodium_version_minor(void);
 
 #endif

src/libsodium/version.c

@@ -0,0 +1,20 @@
+
+#include "version.h"
+
+const char *
+sodium_version_string(void)
+{
+    return SODIUM_VERSION_STRING;
+}
+
+const int
+sodium_version_major(void)
+{
+    return SODIUM_VERSION_MAJOR;
+}
+
+const int
+sodium_version_minor(void)
+{
+    return SODIUM_VERSION_MINOR;
+}