[Qemu-devel] [PATCH 2/3] HMP: pass in parameter for info sub command

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

  This patch enable sub info command handler getting meaningful
parameter.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
---
 hmp-commands.hx |    2 +-
 monitor.c       |   79 +++++++++++++++++++++++++++++++++++++++----------------
 2 files changed, 57 insertions(+), 24 deletions(-)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 010b8c9..667fab8 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1486,7 +1486,7 @@ ETEXI
 
     {
         .name       = "info",
-        .args_type  = "item:s?",
+        .args_type  = "item:S?",
         .params     = "[subcommand]",
         .help       = "show various information about the system state",
         .mhandler.cmd = do_info,
diff --git a/monitor.c b/monitor.c
index 797680f..ce0e74d 100644
--- a/monitor.c
+++ b/monitor.c
@@ -464,6 +464,11 @@ QEMU_BUILD_BUG_ON(ARRAY_SIZE(monitor_event_names) != QEVENT_MAX)
 MonitorEventState monitor_event_state[QEVENT_MAX];
 QemuMutex monitor_event_state_lock;
 
+static const mon_cmd_t *monitor_parse_command(Monitor *mon,
+                                              const char *cmdline,
+                                              const mon_cmd_t *table,
+                                              QDict *qdict);
+
 /*
  * Emits the event to every monitor instance
  */
@@ -809,26 +814,29 @@ static void user_async_cmd_handler(Monitor *mon, const mon_cmd_t *cmd,
 static void do_info(Monitor *mon, const QDict *qdict)
 {
     const mon_cmd_t *cmd;
+    QDict *qdict_info;
     const char *item = qdict_get_try_str(qdict, "item");
 
     if (!item) {
         goto help;
     }
 
-    for (cmd = info_cmds; cmd->name != NULL; cmd++) {
-        if (compare_cmd(item, cmd->name))
-            break;
-    }
+    qdict_info = qdict_new();
 
-    if (cmd->name == NULL) {
-        goto help;
+    cmd = monitor_parse_command(mon, item, info_cmds, qdict_info);
+    if (!cmd) {
+        QDECREF(qdict_info);
+        /* don't help here, to avoid error message got ignored */
+        return;
     }
 
-    cmd->mhandler.info(mon, NULL);
+    cmd->mhandler.info(mon, qdict_info);
+    QDECREF(qdict_info);
     return;
 
 help:
     help_cmd(mon, "info");
+    return;
 }
 
 CommandInfoList *qmp_query_commands(Error **errp)
@@ -3534,18 +3542,15 @@ static const mon_cmd_t *search_dispatch_table(const mon_cmd_t *disp_table,
     return NULL;
 }
 
-static const mon_cmd_t *monitor_find_command(const char *cmdname)
+static const mon_cmd_t *monitor_find_command(const char *cmdname,
+                                             const mon_cmd_t *table)
 {
-    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);
+    return search_dispatch_table(table, cmdname);
 }
 
 static const mon_cmd_t *monitor_parse_command(Monitor *mon,
                                               const char *cmdline,
+                                              const mon_cmd_t *table,
                                               QDict *qdict)
 {
     const char *p, *typestr;
@@ -3564,7 +3569,7 @@ static const mon_cmd_t *monitor_parse_command(Monitor *mon,
     if (!p)
         return NULL;
 
-    cmd = monitor_find_command(cmdname);
+    cmd = monitor_find_command(cmdname, table);
     if (!cmd) {
         monitor_printf(mon, "unknown command: '%s'\n", cmdname);
         return NULL;
@@ -3872,6 +3877,31 @@ static const mon_cmd_t *monitor_parse_command(Monitor *mon,
                 }
             }
             break;
+        case 'S':
+            {
+                /* package all remaining string */
+                int len;
+
+                while (qemu_isspace(*p)) {
+                    p++;
+                }
+                if (*typestr == '?') {
+                    typestr++;
+                    if (*p == '\0') {
+                        /* no remaining string: NULL argument */
+                        break;
+                    }
+                }
+                len = strlen(p);
+                if (len <= 0) {
+                    monitor_printf(mon, "%s: string expected\n",
+                                   cmdname);
+                    break;
+                }
+                qdict_put(qdict, key, qstring_from_str(p));
+                p += len;
+            }
+            break;
         default:
         bad_type:
             monitor_printf(mon, "%s: unknown type '%c'\n", cmdname, c);
@@ -3925,7 +3955,7 @@ static void handle_user_command(Monitor *mon, const char *cmdline)
 
     qdict = qdict_new();
 
-    cmd = monitor_parse_command(mon, cmdline, qdict);
+    cmd = monitor_parse_command(mon, cmdline, mon_cmds, qdict);
     if (!cmd)
         goto out;
 
@@ -4144,12 +4174,7 @@ static void monitor_find_completion(const char *cmdline)
             break;
         case 's':
             /* XXX: more generic ? */
-            if (!strcmp(cmd->name, "info")) {
-                readline_set_completion_index(cur_mon->rs, strlen(str));
-                for(cmd = info_cmds; cmd->name != NULL; cmd++) {
-                    cmd_completion(str, cmd->name);
-                }
-            } else if (!strcmp(cmd->name, "sendkey")) {
+            if (!strcmp(cmd->name, "sendkey")) {
                 char *sep = strrchr(str, '-');
                 if (sep)
                     str = sep + 1;
@@ -4163,6 +4188,14 @@ static void monitor_find_completion(const char *cmdline)
                     cmd_completion(str, cmd->name);
                 }
             }
+        case 'S':
+            /* generic string packaged */
+            if (!strcmp(cmd->name, "info")) {
+                readline_set_completion_index(cur_mon->rs, strlen(str));
+                for (cmd = info_cmds; cmd->name != NULL; cmd++) {
+                    cmd_completion(str, cmd->name);
+                }
+            }
             break;
         default:
             break;
@@ -4483,7 +4516,7 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
         goto err_out;
     }
 
-    cmd = qmp_find_cmd(cmd_name);
+    cmd = monitor_find_command(cmd_name, qmp_cmds);
     if (!cmd) {
         qerror_report(QERR_COMMAND_NOT_FOUND, cmd_name);
         goto err_out;
-- 
1.7.1