[at-spi2-core] Fix some return values

[Mike Gorse <mgorse src gnome org>]

commit a23a14c031bbf85f30ff7f3e4b0ba1d505505e1d
Author: Mike Gorse <mgorse novell com>
Date:   Thu Dec 30 13:34:10 2010 -0500

    Fix some return values

 atspi/atspi-component.c |    8 ++++----
 atspi/atspi-text.c      |   13 +++++++++++--
 2 files changed, 15 insertions(+), 6 deletions(-)
---
diff --git a/atspi/atspi-component.c b/atspi/atspi-component.c
index 31298bd..f653a28 100644
--- a/atspi/atspi-component.c
+++ b/atspi/atspi-component.c
@@ -146,7 +146,7 @@ atspi_component_get_extents (AtspiComponent *obj,
   dbus_uint32_t d_ctype = ctype;
   AtspiRect bbox;
 
-  bbox.x = bbox.y = bbox.width = bbox.height = 0;
+  bbox.x = bbox.y = bbox.width = bbox.height = -1;
   g_return_val_if_fail (obj != NULL, atspi_rect_copy (&bbox));
 
   _atspi_dbus_call (obj, atspi_interface_component, "GetExtents", error, "u=>(iiii)", d_ctype, &bbox);
@@ -171,7 +171,7 @@ atspi_component_get_position (AtspiComponent *obj,
   dbus_uint16_t d_ctype = ctype;
   AtspiPoint ret;
 
-  ret.x = ret.y = 0;
+  ret.x = ret.y = -1;
 
   if (!obj)
     return atspi_point_copy (&ret);
@@ -197,7 +197,7 @@ atspi_component_get_size (AtspiComponent *obj, GError **error)
   dbus_int32_t d_w, d_h;
   AtspiPoint ret;
 
-  ret.x = ret.y = 0;
+  ret.x = ret.y = -1;
   if (!obj)
     return atspi_point_copy (&ret);
 
@@ -219,7 +219,7 @@ atspi_component_get_size (AtspiComponent *obj, GError **error)
 AtspiComponentLayer
 atspi_component_get_layer (AtspiComponent *obj, GError **error)
 {
-  dbus_uint32_t zlayer = 0;
+  dbus_uint32_t zlayer = -1;
 
   _atspi_dbus_call (obj, atspi_interface_component, "GetLayer", error, "=>u", &zlayer);
 
diff --git a/atspi/atspi-text.c b/atspi/atspi-text.c
index 88ac10a..1044f1b 100644
--- a/atspi/atspi-text.c
+++ b/atspi/atspi-text.c
@@ -102,13 +102,16 @@ atspi_text_get_text (AtspiText *obj,
                         gint end_offset,
                         GError **error)
 {
-  gchar *retval;
+  gchar *retval = NULL;
   dbus_int32_t d_start_offset = start_offset, d_end_offset = end_offset;
 
-  g_return_val_if_fail (obj != NULL, NULL);
+  g_return_val_if_fail (obj != NULL, g_strdup (""));
 
   _atspi_dbus_call (obj, atspi_interface_text, "GetText", error, "ii=>s", start_offset, end_offset, &retval);
 
+  if (!retval)
+    retval = g_strdup ("");
+
   return retval;
 }
 
@@ -356,6 +359,8 @@ atspi_text_get_text_before_offset (AtspiText *obj,
 
   range->start_offset = d_start_offset;
   range->end_offset = d_end_offset;
+  if (!range->content)
+    range->content = g_strdup ("");
 
   return range;
 }
@@ -397,6 +402,8 @@ atspi_text_get_text_at_offset (AtspiText *obj,
 
   range->start_offset = d_start_offset;
   range->end_offset = d_end_offset;
+  if (!range->content)
+    range->content = g_strdup ("");
 
   return range;
 }
@@ -439,6 +446,8 @@ atspi_text_get_text_after_offset (AtspiText *obj,
 
   range->start_offset = d_start_offset;
   range->end_offset = d_end_offset;
+  if (!range->content)
+    range->content = g_strdup ("");
 
   return range;
 }