[PATCH 1/5] monitor: allow register hmp commands

[Gerd Hoffmann <kraxel@redhat.com>]

Allow commands having a NULL cmd pointer, add a function to set the
pointer later.  Use case: allow modules implement hmp commands.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 include/monitor/monitor.h |  3 +++
 monitor/hmp.c             |  7 +++++++
 monitor/misc.c            | 15 +++++++++++++++
 3 files changed, 25 insertions(+)

diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h
index 1211d6e6d69f..1a8a369b50b2 100644
--- a/include/monitor/monitor.h
+++ b/include/monitor/monitor.h
@@ -51,4 +51,7 @@ int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags);
 void monitor_fdset_dup_fd_remove(int dup_fd);
 int64_t monitor_fdset_dup_fd_find(int dup_fd);
 
+void monitor_register_hmp(const char *name, bool info,
+                          void (*cmd)(Monitor *mon, const QDict *qdict));
+
 #endif /* MONITOR_H */
diff --git a/monitor/hmp.c b/monitor/hmp.c
index 6c0b33a0b19d..d50c3124e1e1 100644
--- a/monitor/hmp.c
+++ b/monitor/hmp.c
@@ -1089,6 +1089,13 @@ void handle_hmp_command(MonitorHMP *mon, const char *cmdline)
         return;
     }
 
+    if (!cmd->cmd) {
+        /* FIXME: is it useful to try autoload modules here ??? */
+        monitor_printf(&mon->common, "Command \"%.*s\" is not available.\n",
+                       (int)(cmdline - cmd_start), cmd_start);
+        return;
+    }
+
     qdict = monitor_parse_arguments(&mon->common, &cmdline, cmd);
     if (!qdict) {
         while (cmdline > cmd_start && qemu_isspace(cmdline[-1])) {
diff --git a/monitor/misc.c b/monitor/misc.c
index 1539e18557f0..672267008b02 100644
--- a/monitor/misc.c
+++ b/monitor/misc.c
@@ -1974,6 +1974,21 @@ static void sortcmdlist(void)
           compare_mon_cmd);
 }
 
+void monitor_register_hmp(const char *name, bool info,
+                          void (*cmd)(Monitor *mon, const QDict *qdict))
+{
+    HMPCommand *table = info ? hmp_info_cmds : hmp_cmds;
+
+    while (table->name != NULL) {
+        if (strcmp(table->name, name) == 0) {
+            table->cmd = cmd;
+            return;
+        }
+        table++;
+    }
+    g_assert_not_reached();
+}
+
 void monitor_init_globals(void)
 {
     monitor_init_globals_core();
-- 
2.31.1