[gnumeric] SheetStyle: Add sanity check. (Which currently asserts.)

[Morten Welinder <mortenw src gnome org>]

commit 4239ce318c202c92556f0aaa95b3bbf6b8bccaea
Author: Morten Welinder <terra gnome org>
Date:   Fri May 1 11:43:17 2009 -0400

    SheetStyle: Add sanity check.  (Which currently asserts.)
---
 ChangeLog         |    5 +++++
 src/sheet-style.c |   29 +++++++++++++++++++++++++++--
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 66594b9..25dcf4d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-05-01  Morten Welinder  <terra gnome org>
+
+	* src/sheet-style.c (sheet_style_sanity_check): New function.
+	(sheet_style_init): Call sheet_style_sanity_check.
+
 2009-05-01  Andreas J. Guelzow <aguelzow pyrshep ca>
 
 	* src/commands.h (cmd_set_comment): add author argument
diff --git a/src/sheet-style.c b/src/sheet-style.c
index 924efa9..dc57600 100644
--- a/src/sheet-style.c
+++ b/src/sheet-style.c
@@ -181,8 +181,7 @@ rstyle_apply (GnmStyle **old, ReplacementStyle *rs)
 
 /****************************************************************************/
 
-/* If you change this, change the tile_{widths,heights} here, in sheet_style_get
- * and in the sanity check in sheet_style_init
+/* If you change this, change the tile_{widths,heights} here
  * and GNM_MAX_COLS and GNM_MAX_ROWS in gnumeric.h */ 
 #define TILE_TOP_LEVEL 5
 
@@ -439,6 +438,29 @@ cell_tile_matrix_set (CellTile *t, GnmRange const *indic, ReplacementStyle *rs)
 /****************************************************************************/
 
 static void
+sheet_style_sanity_check (void)
+{
+	unsigned c, r;
+	int i;
+
+	for (c = 1, i = 0; i < TILE_TOP_LEVEL; i++) {
+		g_assert (c < G_MAXUINT / TILE_SIZE_COL);
+		c *= TILE_SIZE_COL;
+	}
+	g_assert (c >= GNM_MAX_COLS);
+
+	for (r = 1, i = 0; i < TILE_TOP_LEVEL; i++) {
+		g_assert (r < G_MAXUINT / TILE_SIZE_COL);
+		r *= TILE_SIZE_ROW;
+	}
+	g_assert (r >= GNM_MAX_ROWS);
+
+	g_assert (G_N_ELEMENTS (tile_heights) > TILE_TOP_LEVEL);
+
+	g_assert (G_N_ELEMENTS (tile_widths) > TILE_TOP_LEVEL);
+}
+
+static void
 sheet_style_init_size (Sheet *sheet, int cols, int rows)
 {
 	GnmStyle *default_style;
@@ -517,6 +539,9 @@ sheet_style_init (Sheet *sheet)
 {
 	int cols = gnm_sheet_get_max_cols (sheet);
 	int rows = gnm_sheet_get_max_rows (sheet);
+
+	sheet_style_sanity_check ();
+
 	sheet_style_init_size (sheet, cols, rows);
 }