dialog: add a default username for dialog_Login

include/vlc_dialog.h

@@ -72,15 +72,16 @@ typedef struct dialog_login_t
 {
     const char *title;
     const char *message;
+    const char *default_username;
     char **username;
     char **password;
     /* if store is NULL, password can't be stored (there is no keystore) */
     bool *store;
 } dialog_login_t;
 
-VLC_API void dialog_Login(vlc_object_t *, char **, char **, bool *, const char *, const char *, ...) VLC_FORMAT (6, 7);
-#define dialog_Login(o, u, p, s, t, ...) \
-        dialog_Login(VLC_OBJECT(o), u, p, s, t, __VA_ARGS__)
+VLC_API void dialog_Login(vlc_object_t *, const char *, char **, char **, bool *, const char *, const char *, ...) VLC_FORMAT (7, 8);
+#define dialog_Login(o, u, p, s, t, v, ...) \
+        dialog_Login(VLC_OBJECT(o), u, p, s, t, v, __VA_ARGS__)
 
 /**
  * A question dialog.

src/interface/dialog.c

@@ -141,7 +141,8 @@ void dialog_VFatal (vlc_object_t *obj, bool modal, const char *title,
  * into the username resp password pointer. Those must be freed with free().
  * Otherwise *username resp *password will be NULL.
  */
-void dialog_Login (vlc_object_t *obj, char **username, char **password,
+void dialog_Login (vlc_object_t *obj, const char *default_username,
+                   char **username, char **password,
                    bool *store, const char *title, const char *fmt, ...)
 {
     assert ((username != NULL) && (password != NULL));
@@ -160,7 +161,8 @@ void dialog_Login (vlc_object_t *obj, char **username, char **password,
     va_start (ap, fmt);
     if (vasprintf (&text, fmt, ap) != -1)
     {
-        dialog_login_t dialog = { title, text, username, password, store };
+        dialog_login_t dialog = { title, text, default_username, username,
+                                  password, store };
         var_SetAddress (provider, "dialog-login", &dialog);
         free (text);
     }

src/misc/keystore.c

@@ -399,7 +399,8 @@ vlc_credential_get(vlc_credential *p_credential, vlc_object_t *p_parent,
                 return false;
             }
             va_end(ap);
-            dialog_Login(p_parent, &p_credential->psz_dialog_username,
+            dialog_Login(p_parent, p_credential->psz_username,
+                         &p_credential->psz_dialog_username,
                          &p_credential->psz_dialog_password,
                          p_credential->p_keystore ? &p_credential->b_store : NULL,
                          psz_dialog_title, psz_dialog_text);