[PULL 1/5] readline: fix hmp completion issue

[Markus Armbruster <armbru@redhat.com>]

From: Dongli Zhang <dongli.zhang@oracle.com>

The auto completion does not work in some cases.

Case 1.

1. (qemu) info reg
2. Press 'Tab'.
3. It does not auto complete.

Case 2.

1. (qemu) block_resize flo
2. Press 'Tab'.
3. It does not auto complete 'floppy0'.

Since the readline_add_completion_of() may add any completion when
strlen(pfx) is zero, we remove the check with (name[0] == '\0') because
strlen() always returns zero in that case.

Fixes: 52f50b1e9f8f ("readline: Extract readline_add_completion_of() from monitor")
Cc: Joe Jin <joe.jin@oracle.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Message-Id: <20230207045241.8843-1-dongli.zhang@oracle.com>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 monitor/hmp.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/monitor/hmp.c b/monitor/hmp.c
index 2aa85d3982..fee410362f 100644
--- a/monitor/hmp.c
+++ b/monitor/hmp.c
@@ -1189,9 +1189,7 @@ static void cmd_completion(MonitorHMP *mon, const char *name, const char *list)
         }
         memcpy(cmd, pstart, len);
         cmd[len] = '\0';
-        if (name[0] == '\0') {
-            readline_add_completion_of(mon->rs, name, cmd);
-        }
+        readline_add_completion_of(mon->rs, name, cmd);
         if (*p == '\0') {
             break;
         }
@@ -1335,9 +1333,7 @@ static void monitor_find_completion_by_table(MonitorHMP *mon,
             /* block device name completion */
             readline_set_completion_index(mon->rs, strlen(str));
             while ((blk = blk_next(blk)) != NULL) {
-                if (str[0] == '\0') {
-                    readline_add_completion_of(mon->rs, str, blk_name(blk));
-                }
+                readline_add_completion_of(mon->rs, str, blk_name(blk));
             }
             break;
         case 's':
-- 
2.39.0