[PATCH 1/2] lib: Annotate more function as NULL terminated

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

While __attribute((sentinel)) (exposed by glib under
G_GNUC_NULL_TERMINATED macro) is a gcc extension, it's supported
by clang too. It's already being used throughout our code but
some functions that take variadic arguments and expect NULL at
the end were lacking such annotation. Fill them in.

After this, there are still some functions left untouched because
they expect a different sentinel than NULL. Unfortunately, glib
does not provide macro for different sentinels. We may come up
with our own, but let's save that for future work.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 src/qemu/qemu_monitor.h            | 3 ++-
 src/qemu/qemu_monitor_json.c       | 2 +-
 tests/qemumigrationcookiexmltest.c | 2 +-
 tests/testutils.h                  | 3 ++-
 tests/testutilsqemuschema.h        | 3 ++-
 tools/vsh.c                        | 2 +-
 6 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index 6e81945201..b78f539c85 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -947,7 +947,8 @@ int qemuMonitorDelDevice(qemuMonitor *mon,
 int qemuMonitorCreateObjectProps(virJSONValue **propsret,
                                  const char *type,
                                  const char *alias,
-                                 ...);
+                                 ...)
+    G_GNUC_NULL_TERMINATED;
 
 int qemuMonitorAddObject(qemuMonitor *mon,
                          virJSONValue **props,
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index eb84a3d938..c5e758e7f8 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -468,7 +468,7 @@ qemuMonitorJSONHasError(virJSONValue *reply,
  *
  * Returns 0 on success and -1 on error.
  */
-static int
+static int G_GNUC_NULL_TERMINATED
 qemuMonitorJSONTransactionAdd(virJSONValue *actions,
                               const char *cmdname,
                               ...)
diff --git a/tests/qemumigrationcookiexmltest.c b/tests/qemumigrationcookiexmltest.c
index 5270e3a7e7..bc0f68b8c5 100644
--- a/tests/qemumigrationcookiexmltest.c
+++ b/tests/qemumigrationcookiexmltest.c
@@ -39,7 +39,7 @@ static virQEMUDriver driver;
 
 static virBuffer testnamebuf = VIR_BUFFER_INITIALIZER;
 
-static const char *
+static const char * G_GNUC_NULL_TERMINATED
 tn(const char *str, ...)
 {
     va_list ap;
diff --git a/tests/testutils.h b/tests/testutils.h
index e5469c5aa0..e22324e06d 100644
--- a/tests/testutils.h
+++ b/tests/testutils.h
@@ -113,7 +113,8 @@ void virTestFakeRootDirCleanup(char *fakerootdir);
 int virTestMain(int argc,
                 char **argv,
                 int (*func)(void),
-                ...);
+                ...)
+    G_GNUC_NULL_TERMINATED;
 
 /* Setup, then call func() */
 #define VIR_TEST_MAIN(func) \
diff --git a/tests/testutilsqemuschema.h b/tests/testutilsqemuschema.h
index cb1e6da69e..191e763936 100644
--- a/tests/testutilsqemuschema.h
+++ b/tests/testutilsqemuschema.h
@@ -40,7 +40,8 @@ testQEMUSchemaValidateCommand(const char *command,
 
 int
 testQEMUSchemaEntryMatchTemplate(virJSONValue *schemaentry,
-                                 ...);
+                                 ...)
+    G_GNUC_NULL_TERMINATED;
 
 
 virJSONValue *
diff --git a/tools/vsh.c b/tools/vsh.c
index 6cc1f60d87..9fbb1f9349 100644
--- a/tools/vsh.c
+++ b/tools/vsh.c
@@ -2418,7 +2418,7 @@ vshCloseLogFile(vshControl *ctl)
 }
 
 #ifndef WIN32
-static void
+static void G_GNUC_NULL_TERMINATED
 vshPrintRaw(vshControl *ctl, ...)
 {
     va_list ap;
-- 
2.44.1