[spice-gtk 1/2] Check --spice-color-depth parameter validity

[Christophe Fergeau <cfergeau@xxxxxxxxxx>]

When --spice-color-depth is used, error out unless the color depth
is 16 or 32.

Fixes rhbz#818847
---
 gtk/spice-option.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/gtk/spice-option.c b/gtk/spice-option.c
index ea5d226..c65397a 100644
--- a/gtk/spice-option.c
+++ b/gtk/spice-option.c
@@ -52,6 +52,33 @@ static gboolean option_debug(void)
     return TRUE;
 }
 
+static gboolean parse_color_depth(const gchar *option_name, const gchar *value,
+                                  gpointer data, GError **error)
+{
+    unsigned long parsed_depth;
+    char *end;
+
+    if (option_name == NULL) {
+        g_set_error(error, G_OPTION_ERROR, G_OPTION_ERROR_FAILED, _("missing color depth, must be 16 or 32"));
+        return FALSE;
+    }
+
+    parsed_depth = strtoul(value, &end, 0);
+    if (*end != '\0')
+        goto error;
+
+    if ((parsed_depth != 16) && (parsed_depth != 32))
+        goto error;
+
+    color_depth = parsed_depth;
+
+    return TRUE;
+
+error:
+    g_set_error(error, G_OPTION_ERROR, G_OPTION_ERROR_FAILED, _("invalid color depth (%s), must be 16 or 32"), value);
+    return FALSE;
+}
+
 /**
  * spice_get_option_group:
  *
@@ -65,7 +92,7 @@ GOptionGroup* spice_get_option_group(void)
     const GOptionEntry entries[] = {
         { "spice-disable-effects", '\0', 0, G_OPTION_ARG_STRING, &disable_effects,
           N_("Disable guest display effects"), N_("<wallpaper,font-smooth,animation,all>") },
-        { "spice-color-depth", '\0', 0, G_OPTION_ARG_INT, &color_depth,
+        { "spice-color-depth", '\0', 0, G_OPTION_ARG_CALLBACK, parse_color_depth,
           N_("Guest display color depth"), N_("<16,32>") },
         { "spice-ca-file", '\0', 0, G_OPTION_ARG_FILENAME, &ca_file,
           N_("Truststore file for secure connections"), N_("<file>") },
-- 
1.7.11.2

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