package: add ABI version checking

jim.h now includes JIM_ABI_VERSION that should be incremented whenever
the ABI changes. Then all loadable modules should call Jim_CheckAbiVersion()
to make sure they are loaded against the correct version.

Add Jim_PackageProvideCheck() that does both Jim_CheckAbiVersion()
and Jim_PackageProvide() to simplify the implementation of loadable extensions.

Also rename the "big" sqlite3 extension to just sqlite to avoid a naming conflict with
the smaller jim-sqlite3 extension.

Signed-off-by: Steve Bennett <steveb@workware.net.au>

1 files changed, 13 insertions, 0 deletions

diff --git a/jim.c b/jim.c
index 0de2f3e..7c54628 100644
--- a/jim.c
+++ b/jim.c
@@ -16206,6 +16206,19 @@ void Jim_SetResultFormatted(Jim_Interp *interp, const char *format, ...)
     }
 }
 
+/* Should be called as the first thing in a loadable module to verify
+ * that the interpeter ABI is compatible with the ABI that the module was compiled against.
+ * Returns JIM_ERR and sets an error if mismatch.
+ */
+int Jim_CheckAbiVersion(Jim_Interp *interp, int abi_version)
+{
+    if (abi_version != JIM_ABI_VERSION) {
+        Jim_SetResultString(interp, "ABI version mismatch", -1);
+        return JIM_ERR;
+    }
+    return JIM_OK;
+}
+
 /* stubs */
 #ifndef jim_ext_package
 int Jim_PackageProvide(Jim_Interp *interp, const char *name, const char *ver, int flags)