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monitor: print message when using 'help' with an unknown command

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When typing 'help' followed by an unknown command, QEMU will
not print anything to the command line to let the user know
they typed a bad command. Let's fix this by printing a message
to the monitor when this happens. For example:

    (qemu) help xyz
    unknown command: 'xyz'

Reported-by: Stefan Zimmermann <stzi@linux.ibm.com>
Signed-off-by: Collin Walling <walling@linux.ibm.com>
Message-Id: <1532115624-27568-1-git-send-email-walling@linux.ibm.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Collin Walling 2018-07-20 15:40:24 -04:00 committed by Dr. David Alan Gilbert
parent 506e4a00de
commit 43e87b3eaf
1 changed files with 8 additions and 1 deletions
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9
monitor.c
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@ -952,6 +952,7 @@ static void help_cmd_dump(Monitor *mon, const mon_cmd_t *cmds,
char **args, int nb_args, int arg_index) char **args, int nb_args, int arg_index)
{ {
const mon_cmd_t *cmd; const mon_cmd_t *cmd;
size_t i;
/* No valid arg need to compare with, dump all in *cmds */ /* No valid arg need to compare with, dump all in *cmds */
if (arg_index >= nb_args) { if (arg_index >= nb_args) {
@ -973,9 +974,15 @@ static void help_cmd_dump(Monitor *mon, const mon_cmd_t *cmds,
} else { } else {
help_cmd_dump_one(mon, cmd, args, arg_index); help_cmd_dump_one(mon, cmd, args, arg_index);
} }
break; return;
} }
} }
/* Command not found */
monitor_printf(mon, "unknown command: '");
for (i = 0; i <= arg_index; i++) {
monitor_printf(mon, "%s%s", args[i], i == arg_index ? "'\n" : " ");
}
} }
static void help_cmd(Monitor *mon, const char *name) static void help_cmd(Monitor *mon, const char *name)