X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fgtksheet%2Fpsppire-axis-impl.c;h=7a8b00d7dfa5814bef82174adab59974a1db57c7;hb=d26b0b232197cf1610544f3c9a96eeb0285dd2cb;hp=0505d1a51e5247f474d34c434abeb5cc198196fb;hpb=1fe087cbcce6a9eb41928b7af6b58c7a2aac47f8;p=pspp-builds.git

diff --git a/lib/gtksheet/psppire-axis-impl.c b/lib/gtksheet/psppire-axis-impl.c
index 0505d1a5..7a8b00d7 100644
--- a/lib/gtksheet/psppire-axis-impl.c
+++ b/lib/gtksheet/psppire-axis-impl.c
@@ -46,14 +46,19 @@ get_unit_at_pixel (const PsppireAxis *axis, glong pixel)
   PsppireAxisImpl *a = PSPPIRE_AXIS_IMPL (axis);
 
   unsigned long int start;
+  struct tower_node *n;
+  struct axis_node *an;
+  gfloat fraction;
 
-  struct tower_node *n = tower_lookup (&a->pixel_tower, pixel, &start);
+  g_return_val_if_fail (pixel >= 0, -1);
 
-  struct axis_node *an = tower_data (n, struct axis_node, pixel_node);
+  n = tower_lookup (&a->pixel_tower, pixel, &start);
+  an = tower_data (n, struct axis_node, pixel_node);
 
-  gfloat fraction = (pixel - start) / (gfloat) tower_node_get_size (&an->pixel_node);
+  fraction = (pixel - start) / (gfloat) tower_node_get_size (&an->pixel_node);
 
-  return  tower_node_get_level (&an->unit_node) + fraction * tower_node_get_size (&an->unit_node);
+  return  tower_node_get_level (&an->unit_node)
+    + fraction * tower_node_get_size (&an->unit_node);
 }