From patchwork Fri Jul 26 03:20:38 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wayne Xia X-Patchwork-Id: 262043 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 95EF32C00CB for ; Fri, 26 Jul 2013 13:29:59 +1000 (EST) Received: from localhost ([::1]:42832 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V2Yj7-0003EK-N6 for incoming@patchwork.ozlabs.org; Thu, 25 Jul 2013 23:29:57 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38435) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V2Ycn-0001yK-JG for qemu-devel@nongnu.org; Thu, 25 Jul 2013 23:23:26 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1V2Ycm-0005tf-9q for qemu-devel@nongnu.org; Thu, 25 Jul 2013 23:23:25 -0400 Received: from e28smtp03.in.ibm.com ([122.248.162.3]:44869) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V2Ycl-0005tH-NC for qemu-devel@nongnu.org; Thu, 25 Jul 2013 23:23:24 -0400 Received: from /spool/local by e28smtp03.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Fri, 26 Jul 2013 08:46:24 +0530 Received: from d28relay04.in.ibm.com (d28relay04.in.ibm.com [9.184.220.61]) by d28dlp03.in.ibm.com (Postfix) with ESMTP id D5BCE1258043 for ; Fri, 26 Jul 2013 08:52:44 +0530 (IST) Received: from d28av03.in.ibm.com (d28av03.in.ibm.com [9.184.220.65]) by d28relay04.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r6Q3N9hi37355580 for ; Fri, 26 Jul 2013 08:53:12 +0530 Received: from d28av03.in.ibm.com (loopback [127.0.0.1]) by d28av03.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r6Q3NDWX021387 for ; Fri, 26 Jul 2013 13:23:13 +1000 Received: from RH63Wenchao (wenchaox.cn.ibm.com [9.115.122.121]) by d28av03.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r6Q3L2KP015277; Fri, 26 Jul 2013 13:23:11 +1000 From: Wenchao Xia To: qemu-devel@nongnu.org Date: Fri, 26 Jul 2013 11:20:38 +0800 Message-Id: <1374808842-11051-10-git-send-email-xiawenc@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1374808842-11051-1-git-send-email-xiawenc@linux.vnet.ibm.com> References: <1374808842-11051-1-git-send-email-xiawenc@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13072603-3864-0000-0000-00000944057D X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 122.248.162.3 Cc: pbonzini@redhat.com, Wenchao Xia , armbru@redhat.com, lcapitulino@redhat.com Subject: [Qemu-devel] [PATCH V8 09/13] monitor: support sub command in help X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org The old code in help_cmd() uses global 'info_cmds' and treats it as a special case. Actually 'info_cmds' is a sub command group of 'mon_cmds', in order to avoid direct use of it, help_cmd() needs to change its work mechanism to support sub command and not treat it as a special case any more. To support sub command, help_cmd() will first parse the input and then call help_cmd_dump(), which works as a reentrant function. When it meets a sub command, it simply enters the function again. Since help dumping needs to know whole input to printf full help message include prefix, for example, "help info block" need to printf prefix "info", so help_cmd_dump() takes all args from input and extra parameter arg_index to identify the progress. Another function help_cmd_dump_one() is introduced to printf the prefix and command's help message. Now help supports sub command, so later if another sub command group is added in any depth, help will automatically work for it. Still "help info block" will show error since command parser reject additional parameter, which can be improved later. "log" is still treated as a special case. Signed-off-by: Wenchao Xia Reviewed-by: Eric Blake --- monitor.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++--------- 1 files changed, 53 insertions(+), 10 deletions(-) diff --git a/monitor.c b/monitor.c index c942b77..77df88d 100644 --- a/monitor.c +++ b/monitor.c @@ -868,33 +868,76 @@ static int parse_cmdline(const char *cmdline, return -1; } +static void help_cmd_dump_one(Monitor *mon, + const mon_cmd_t *cmd, + char **prefix_args, + int prefix_args_nb) +{ + int i; + + for (i = 0; i < prefix_args_nb; i++) { + monitor_printf(mon, "%s ", prefix_args[i]); + } + monitor_printf(mon, "%s %s -- %s\n", cmd->name, cmd->params, cmd->help); +} + +/* @args[@arg_index] is the valid command need to find in @cmds */ static void help_cmd_dump(Monitor *mon, const mon_cmd_t *cmds, - const char *prefix, const char *name) + char **args, int nb_args, int arg_index) { const mon_cmd_t *cmd; - for(cmd = cmds; cmd->name != NULL; cmd++) { - if (!name || !strcmp(name, cmd->name)) - monitor_printf(mon, "%s%s %s -- %s\n", prefix, cmd->name, - cmd->params, cmd->help); + /* No valid arg need to compare with, dump all in *cmds */ + if (arg_index >= nb_args) { + for (cmd = cmds; cmd->name != NULL; cmd++) { + help_cmd_dump_one(mon, cmd, args, arg_index); + } + return; + } + + /* Find one entry to dump */ + for (cmd = cmds; cmd->name != NULL; cmd++) { + if (compare_cmd(args[arg_index], cmd->name)) { + if (cmd->sub_table) { + /* continue with next arg */ + help_cmd_dump(mon, cmd->sub_table, + args, nb_args, arg_index + 1); + } else { + help_cmd_dump_one(mon, cmd, args, arg_index); + } + break; + } } } static void help_cmd(Monitor *mon, const char *name) { - if (name && !strcmp(name, "info")) { - help_cmd_dump(mon, info_cmds, "info ", NULL); - } else { - help_cmd_dump(mon, mon->cmd_table, "", name); - if (name && !strcmp(name, "log")) { + char *args[MAX_ARGS]; + int nb_args = 0; + + /* 1. parse user input */ + if (name) { + /* special case for log, directly dump and return */ + if (!strcmp(name, "log")) { const QEMULogItem *item; monitor_printf(mon, "Log items (comma separated):\n"); monitor_printf(mon, "%-10s %s\n", "none", "remove all logs"); for (item = qemu_log_items; item->mask != 0; item++) { monitor_printf(mon, "%-10s %s\n", item->name, item->help); } + return; + } + + if (parse_cmdline(name, &nb_args, args) < 0) { + goto cleanup; } } + + /* 2. dump the contents according to parsed args */ + help_cmd_dump(mon, mon->cmd_table, args, nb_args, 0); + +cleanup: + free_cmdline_args(args, nb_args); } static void do_help_cmd(Monitor *mon, const QDict *qdict)