Track the version of the library

Versioning the objects makes it easy to know ABI compat between old
version of the library and new.
Signed-off-by: Shawn Webb <shawn.webb@hardenedbsd.org>

include/liblattutil.h

@@ -33,6 +33,8 @@
 #include <sqlite3.h>
 #include <ucl.h>
 
+#define LATTUTIL_VERSION	1
+
 struct _lllog;
 struct _sqlite_ctx;
 typedef struct _sqlite_ctx sqlite_ctx_t;
@@ -50,6 +52,7 @@ typedef void (*log_close)(struct _lllog *);
  * preferred over directly accessing the ABI.
  */
 typedef struct _llconfig {
+	uint64_t		 l_version;
 	struct stat		 l_sb;
 	char			*l_path;
 	int			 l_fd;
@@ -58,6 +61,7 @@ typedef struct _llconfig {
 } lattutil_config_path_t;
 
 typedef struct _lllog {
+	uint64_t	 ll_version;
 	int		 ll_verbosity;
 	char		*ll_path;
 
@@ -70,6 +74,7 @@ typedef struct _lllog {
 } lattutil_log_t;
 
 typedef struct _lattutil_sql_ctx {
+	uint64_t	 lsq_version;
 	sqlite3		*lsq_sqlctx;
 	char		*lsq_path;
 	uint64_t	 lsq_flags;

src/config.c

@@ -45,6 +45,8 @@ lattutil_find_config(const char **paths, size_t npaths,
 		return (NULL);
 	}
 
+	res->l_version = LATTUTIL_VERSION;
+
 	res->l_fd = -1;
 	for (i = 0; i < npaths; i++) {
 		sz = strlen(paths[i]) + strlen(filename) + 3;

src/log-main.c

@@ -42,6 +42,8 @@ lattutil_log_init(char *path, int verbosity)
 		return (NULL);
 	}
 
+	res->ll_version = LATTUTIL_VERSION;
+
 	res->ll_verbosity = (verbosity == -1) ? LATTUTIL_LOG_VERBOSITY_DEFAULT :
 	    verbosity;
 	if (path != NULL) {

src/sqlite3.c

@@ -53,6 +53,8 @@ lattutil_sqlite_ctx_new(const char *path, lattutil_log_t *logger,
 		return (NULL);
 	}
 
+	ctx->lsq_version = LATTUTIL_VERSION;
+
 	ctx->lsq_path = strdup(path);
 	if (ctx->lsq_path == NULL) {
 		free(ctx);