[Qemu-devel] [PATCH 1/5] Introduce -display argument

[Jes.Sorensen@redhat.com]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

This patch introduces a -display argument which consolidates the
setting of the display mode. Valid options are:
sdl/curses/default/nographic

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 qemu-options.hx |   28 ++++++++++++++++++++++++++++
 vl.c            |   34 ++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+), 0 deletions(-)

diff --git a/qemu-options.hx b/qemu-options.hx
index badb730..f14ff02 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -590,6 +590,34 @@ STEXI
 @table @option
 ETEXI
 
+DEF("display", HAS_ARG, QEMU_OPTION_display,
+    "-display [default|sdl|curses|nographic|none]\n"
+    "                select display type\n", QEMU_ARCH_ALL)
+STEXI
+@item -display @var{type}
+@findex -display
+Select type of display to use. This option is a replacement for the
+old style -sdl/-curses/... options. Valid values for @var{type} are
+@table @option
+@item default
+Pick the default display option. This will depend on how QEMU was
+configured. (This one is the default)
+@item sdl
+Pick the SDL display option.
+@item curses
+Pick the curses display option. Normally, QEMU uses SDL to display the
+VGA output.  With this option, QEMU can display the VGA output when in
+text mode using a curses/ncurses interface.  Nothing is displayed in
+graphical mode.
+@item nographic
+Normally, QEMU uses SDL to display the VGA output. With this option,
+you can totally disable graphical output so that QEMU is a simple
+command line application. The emulated serial port is redirected on
+the console. Therefore, you can still use QEMU to debug a Linux kernel
+with a serial console.
+@end table
+ETEXI
+
 DEF("nographic", 0, QEMU_OPTION_nographic,
     "-nographic      disable graphical output and redirect serial I/Os to console\n",
     QEMU_ARCH_ALL)
diff --git a/vl.c b/vl.c
index 5e007a7..e797e61 100644
--- a/vl.c
+++ b/vl.c
@@ -1554,6 +1554,37 @@ static void select_vgahw (const char *p)
     }
 }
 
+static DisplayType select_display(const char *p)
+{
+    const char *opts;
+    DisplayType display = DT_DEFAULT;
+
+    if (strstart(p, "default", &opts)) {
+        display = DT_DEFAULT;
+    } else if (strstart(p, "sdl", &opts)) {
+#ifdef CONFIG_SDL
+        display = DT_SDL;
+#else
+        fprintf(stderr, "SDL support is disabled\n");
+        exit(1);
+#endif
+    } else if (strstart(p, "curses", &opts)) {
+#ifdef CONFIG_CURSES
+        display = DT_CURSES;
+#else
+        fprintf(stderr, "Curses support is disabled\n");
+        exit(1);
+#endif
+    } else if (strstart(p, "nographic", &opts)) {
+        display = DT_NOGRAPHIC;
+    } else {
+        fprintf(stderr, "Unknown display type: %s\n", p);
+        exit(1);
+    }
+
+    return display;
+}
+
 static int balloon_parse(const char *arg)
 {
     QemuOpts *opts;
@@ -2152,6 +2183,9 @@ int main(int argc, char **argv, char **envp)
                 }
                 numa_add(optarg);
                 break;
+            case QEMU_OPTION_display:
+                display_type = select_display(optarg);
+                break;
             case QEMU_OPTION_nographic:
                 display_type = DT_NOGRAPHIC;
                 break;
-- 
1.7.4