MacOSX semaphore names are limited to 31 chars

Including the terminating NUL. Good job documenting that, guys.

libraries/libmdb/mdb.c

@@ -2164,7 +2164,7 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
 #else	/* _WIN32 */
 #ifdef __APPLE__
 		char *ptr;
-		sprintf(env->me_txns->mti_rmname, "MDBr%.28s", lpath);
+		sprintf(env->me_txns->mti_rmname, "MDBr%.26s", lpath);
 		ptr = env->me_txns->mti_rmname + sizeof("MDBr")-1;
 		while ((ptr = strchr(ptr, '/')))
 			*ptr++ = '_';
@@ -2178,7 +2178,7 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
 			rc = ErrCode();
 			goto fail;
 		}
-		sprintf(env->me_txns->mti_wmname, "MDBw%.28s", lpath);
+		sprintf(env->me_txns->mti_wmname, "MDBw%.26s", lpath);
 		ptr = env->me_txns->mti_wmname + sizeof("MDBw")-1;
 		while ((ptr = strchr(ptr, '/')))
 			*ptr++ = '_';