HMP: add infrastructure for sub command
This patch make parsing of hmp command aware of that it may
have sub command. Also discard simple encapsulation function
monitor_find_command(). For case "@command ", space after
@command is filtered out.
Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/monitor.c b/monitor.c
index 6e87b5c..a77dd3b 100644
--- a/monitor.c
+++ b/monitor.c
@@ -129,6 +129,11 @@
MonitorCompletion *cb, void *opaque);
} mhandler;
int flags;
+ /* @sub_table is a list of 2nd level of commands. If it do not exist,
+ * mhandler should be used. If it exist, sub_table[?].mhandler should be
+ * used, and mhandler of 1st level plays the role of help function.
+ */
+ struct mon_cmd_t *sub_table;
} mon_cmd_t;
/* file descriptors passed via SCM_RIGHTS */
@@ -3541,18 +3546,27 @@
return NULL;
}
-static const mon_cmd_t *monitor_find_command(const char *cmdname)
-{
- return search_dispatch_table(mon_cmds, cmdname);
-}
-
static const mon_cmd_t *qmp_find_cmd(const char *cmdname)
{
return search_dispatch_table(qmp_cmds, cmdname);
}
+/*
+ * Parse @cmdline according to command table @table.
+ * If @cmdline is blank, return NULL.
+ * If it can't be parsed, report to @mon, and return NULL.
+ * Else, insert command arguments into @qdict, and return the command.
+ * If sub-command table exist, and if @cmdline contains addtional string for
+ * sub-command, this function will try search sub-command table. if no
+ * addtional string for sub-command exist, this function will return the found
+ * one in @table.
+ * Do not assume the returned command points into @table! It doesn't
+ * when the command is a sub-command.
+ */
static const mon_cmd_t *monitor_parse_command(Monitor *mon,
const char *cmdline,
+ int start,
+ mon_cmd_t *table,
QDict *qdict)
{
const char *p, *typestr;
@@ -3563,20 +3577,35 @@
char *key;
#ifdef DEBUG
- monitor_printf(mon, "command='%s'\n", cmdline);
+ monitor_printf(mon, "command='%s', start='%d'\n", cmdline, start);
#endif
/* extract the command name */
- p = get_command_name(cmdline, cmdname, sizeof(cmdname));
+ p = get_command_name(cmdline + start, cmdname, sizeof(cmdname));
if (!p)
return NULL;
- cmd = monitor_find_command(cmdname);
+ cmd = search_dispatch_table(table, cmdname);
if (!cmd) {
- monitor_printf(mon, "unknown command: '%s'\n", cmdname);
+ monitor_printf(mon, "unknown command: '%.*s'\n",
+ (int)(p - cmdline), cmdline);
return NULL;
}
+ /* filter out following useless space */
+ while (qemu_isspace(*p)) {
+ p++;
+ }
+ /* search sub command */
+ if (cmd->sub_table != NULL) {
+ /* check if user set additional command */
+ if (*p == '\0') {
+ return cmd;
+ }
+ return monitor_parse_command(mon, cmdline, p - cmdline,
+ cmd->sub_table, qdict);
+ }
+
/* parse the parameters */
typestr = cmd->args_type;
for(;;) {
@@ -3932,7 +3961,7 @@
qdict = qdict_new();
- cmd = monitor_parse_command(mon, cmdline, qdict);
+ cmd = monitor_parse_command(mon, cmdline, 0, mon_cmds, qdict);
if (!cmd)
goto out;
