[PATCH v8 1/3] monitor/hmp: add support for flag argument with value

[Fabian Ebner]

From: Stefan Reiter <s.reiter@proxmox.com>

Adds support for the "-xV" parameter type, where "-x" denotes a flag
name and the "V" suffix indicates that this flag is supposed to take
an arbitrary string parameter.

These parameters are always optional, the entry in the qdict will be
omitted if the flag is not given.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
[FE: fixed typo pointed out by Eric Blake]
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
---
 monitor/hmp.c              | 19 ++++++++++++++++++-
 monitor/monitor-internal.h |  3 ++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/monitor/hmp.c b/monitor/hmp.c
index b20737e63c..fd4f5866c7 100644
--- a/monitor/hmp.c
+++ b/monitor/hmp.c
@@ -981,6 +981,7 @@ static QDict *monitor_parse_arguments(Monitor *mon,
             {
                 const char *tmp = p;
                 int skip_key = 0;
+                int ret;
                 /* option */
 
                 c = *typestr++;
@@ -1003,11 +1004,27 @@ static QDict *monitor_parse_arguments(Monitor *mon,
                     }
                     if (skip_key) {
                         p = tmp;
+                    } else if (*typestr == 'V') {
+                        /* has option with string value */
+                        typestr++;
+                        tmp = p++;
+                        while (qemu_isspace(*p)) {
+                            p++;
+                        }
+                        ret = get_str(buf, sizeof(buf), &p);
+                        if (ret < 0) {
+                            monitor_printf(mon, "%s: value expected for -%c\n",
+                                           cmd->name, *tmp);
+                            goto fail;
+                        }
+                        qdict_put_str(qdict, key, buf);
                     } else {
-                        /* has option */
+                        /* has boolean option */
                         p++;
                         qdict_put_bool(qdict, key, true);
                     }
+                } else if (*typestr == 'V') {
+                    typestr++;
                 }
             }
             break;
diff --git a/monitor/monitor-internal.h b/monitor/monitor-internal.h
index 3da3f86c6a..a4cb307c8a 100644
--- a/monitor/monitor-internal.h
+++ b/monitor/monitor-internal.h
@@ -63,7 +63,8 @@
  * '.'          other form of optional type (for 'i' and 'l')
  * 'b'          boolean
  *              user mode accepts "on" or "off"
- * '-'          optional parameter (eg. '-f')
+ * '-'          optional parameter (eg. '-f'); if followed by a 'V', it
+ *              specifies an optional string param (e.g. '-fV' allows '-f foo')
  *
  */
 
-- 
2.30.2