There's too much going on in monitor_parse_command().
Split up the arguments parsing bits into a separate function
monitor_parse_arguments(). Let the original function check for
command validity and sub-commands if any and return data (*cmd)
that the newly introduced function can process and return a
QDict. Also, pass a pointer to the cmdline to track current
parser location.
Suggested-by: Markus Armbruster <arm...@redhat.com>
Signed-off-by: Bandan Das <b...@redhat.com>
---
monitor.c | 90 +++++++++++++++++++++++++++++++++++++--------------------------
1 file changed, 53 insertions(+), 37 deletions(-)
diff --git a/monitor.c b/monitor.c
index b2561e1..521258d 100644
--- a/monitor.c
+++ b/monitor.c
@@ -3683,11 +3683,10 @@ static const mon_cmd_t *qmp_find_cmd(const char
*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 a sub-command table exists, and if @cmdline contains an additional string
+ * Parse cmdline anchored at @endp according to command table @table.
+ * If @*endp is blank, return NULL.
+ * If @*endp is invalid, report to @mon and return NULL.
+ * If a sub-command table exists, and if @*endp contains an additional string
* for a sub-command, this function will try to search the sub-command table.
* If no additional string for a sub-command is present, this function will
* return the command found in @table.
@@ -3695,31 +3694,26 @@ static const mon_cmd_t *qmp_find_cmd(const char
*cmdname)
* 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 **endp,
+ mon_cmd_t *table)
{
- const char *p, *typestr;
- int c;
+ const char *p;
const mon_cmd_t *cmd;
char cmdname[256];
- char buf[1024];
- char *key;
#ifdef DEBUG
- monitor_printf(mon, "command='%s', start='%d'\n", cmdline, start);
+ monitor_printf(mon, "command='%s', start='%d'\n", cmdline, *start);
#endif
/* extract the command name */
- p = get_command_name(cmdline + start, cmdname, sizeof(cmdname));
+ p = get_command_name(*endp, cmdname, sizeof(cmdname));
if (!p)
return NULL;
cmd = search_dispatch_table(table, cmdname);
if (!cmd) {
monitor_printf(mon, "unknown command: '%.*s'\n",
- (int)(p - cmdline), cmdline);
+ (int)(p - *endp), *endp);
return NULL;
}
@@ -3727,16 +3721,33 @@ static const mon_cmd_t *monitor_parse_command(Monitor
*mon,
while (qemu_isspace(*p)) {
p++;
}
+
+ *endp = 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);
+ if (cmd->sub_table != NULL && *p != '\0') {
+ return monitor_parse_command(mon, endp, cmd->sub_table);
}
+ return cmd;
+}
+
+/*
+ * Parse arguments for @cmd anchored at @endp
+ * If it can't be parsed, report to @mon, and return NULL.
+ * Else, insert command arguments into @qdict, and return it.
+ */
+
+static QDict *monitor_parse_arguments(Monitor *mon,
+ const char **endp,
+ const mon_cmd_t *cmd)
+{
+ const char *typestr;
+ char *key;
+ int c;
+ const char *p = *endp;
+ char buf[1024];
+ QDict *qdict = qdict_new();
+
/* parse the parameters */
typestr = cmd->args_type;
for(;;) {
@@ -3766,14 +3777,14 @@ static const mon_cmd_t *monitor_parse_command(Monitor
*mon,
switch(c) {
case 'F':
monitor_printf(mon, "%s: filename expected\n",
- cmdname);
+ cmd->name);
break;
case 'B':
monitor_printf(mon, "%s: block device name expected\n",
- cmdname);
+ cmd->name);
break;
default:
- monitor_printf(mon, "%s: string expected\n", cmdname);
+ monitor_printf(mon, "%s: string expected\n",
cmd->name);
break;
}
goto fail;
@@ -3915,7 +3926,7 @@ static const mon_cmd_t *monitor_parse_command(Monitor
*mon,
goto fail;
/* Check if 'i' is greater than 32-bit */
if ((c == 'i') && ((val >> 32) & 0xffffffff)) {
- monitor_printf(mon, "\'%s\' has failed: ", cmdname);
+ monitor_printf(mon, "\'%s\' has failed: ", cmd->name);
monitor_printf(mon, "integer is for 32-bit values\n");
goto fail;
} else if (c == 'M') {
@@ -4023,7 +4034,7 @@ static const mon_cmd_t *monitor_parse_command(Monitor
*mon,
if(!is_valid_option(p, typestr)) {
monitor_printf(mon, "%s: unsupported option -%c\n",
- cmdname, *p);
+ cmd->name, *p);
goto fail;
} else {
skip_key = 1;
@@ -4057,7 +4068,7 @@ static const mon_cmd_t *monitor_parse_command(Monitor
*mon,
len = strlen(p);
if (len <= 0) {
monitor_printf(mon, "%s: string expected\n",
- cmdname);
+ cmd->name);
break;
}
qdict_put(qdict, key, qstring_from_str(p));
@@ -4066,7 +4077,7 @@ static const mon_cmd_t *monitor_parse_command(Monitor
*mon,
break;
default:
bad_type:
- monitor_printf(mon, "%s: unknown type '%c'\n", cmdname, c);
+ monitor_printf(mon, "%s: unknown type '%c'\n", cmd->name, c);
goto fail;
}
g_free(key);
@@ -4077,13 +4088,14 @@ static const mon_cmd_t *monitor_parse_command(Monitor
*mon,
p++;
if (*p != '\0') {
monitor_printf(mon, "%s: extraneous characters at the end of line\n",
- cmdname);
+ cmd->name);
goto fail;
}
- return cmd;
+ return qdict;
fail:
+ QDECREF(qdict);
g_free(key);
return NULL;
}
@@ -4115,11 +4127,15 @@ static void handle_user_command(Monitor *mon, const
char *cmdline)
QDict *qdict;
const mon_cmd_t *cmd;
- qdict = qdict_new();
+ cmd = monitor_parse_command(mon, &cmdline, mon->cmd_table);
+ if (!cmd) {
+ return;
+ }
- cmd = monitor_parse_command(mon, cmdline, 0, mon->cmd_table, qdict);
- if (!cmd)
- goto out;
+ qdict = monitor_parse_arguments(mon, &cmdline, cmd);
+ if (!qdict) {
+ return;
+ }
if (handler_is_async(cmd)) {
user_async_cmd_handler(mon, cmd, qdict);
@@ -4137,7 +4153,7 @@ static void handle_user_command(Monitor *mon, const char
*cmdline)
cmd->mhandler.cmd(mon, qdict);
}
-out:
+ /* Drop reference taken in monitor_parse_arguments */
QDECREF(qdict);
}
--
2.1.0
