Better handling of bad data in TabbedTextOut/TabbedTextExtent

Checked with: a) Null tabstop array with non-zero number of entries b) Negative number of entries (MSDN is wrong; it is not an error) c) Single tabwidth of negative size d) Single specified tabwidth of zero size

Better handling of bad data in TabbedTextOut/TabbedTextExtent
62a80b76 · Bill Medland · Alexandre Julliard · 9dc2584b · 62a80b76
Commit 62a80b76 authored Jan 31, 2003 by Bill Medland Committed by Alexandre Julliard Jan 31, 2003
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text.c dlls/user/text.c +8 -1

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--- a/dlls/user/text.c
+++ b/dlls/user/text.c
@@ -1216,7 +1216,10 @@ static LONG TEXT_TabbedTextOut( HDC hdc, INT x, INT y, LPCWSTR lpstr,
    extent.cx = 0;
    extent.cy = 0;

-    if (cTabStops == 1)
+    if (!lpTabPos)
+        cTabStops=0;
+
+    if (cTabStops == 1 && *lpTabPos >= /* sic */ 0)
    {
        defWidth = *lpTabPos;
        cTabStops = 0;
@@ -1226,6 +1229,8 @@ static LONG TEXT_TabbedTextOut( HDC hdc, INT x, INT y, LPCWSTR lpstr,
        TEXTMETRICA tm;
        GetTextMetricsA( hdc, &tm );
        defWidth = 8 * tm.tmAveCharWidth;
+        if (cTabStops == 1)
+            cTabStops = 0; /* on negative *lpTabPos */
    }

    while (count > 0)
@@ -1243,6 +1248,8 @@ static LONG TEXT_TabbedTextOut( HDC hdc, INT x, INT y, LPCWSTR lpstr,
            tabPos = x + extent.cx;
        else if (cTabStops > 0)
            tabPos = nTabOrg + *lpTabPos;
+        else if (defWidth <= 0)
+            tabPos = x + extent.cx;
        else
            tabPos = nTabOrg + ((x + extent.cx - nTabOrg) / defWidth + 1) * defWidth;
        if (fDisplayText)