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From: <hesso@pool.math.tu-berlin.de>
Subject: Catch segfaults when the screen is only one line high.
diff -Naur nvi-1.81.6.orig/vi/vi.c nvi-1.81.6/vi/vi.c
--- nvi-1.81.6.orig/vi/vi.c 2007-11-18 17:41:42.000000000 +0100
+++ nvi-1.81.6/vi/vi.c 2008-05-01 18:15:14.000000000 +0200
@@ -974,6 +974,14 @@
sp->rows = vip->srows = O_VAL(sp, O_LINES);
sp->cols = O_VAL(sp, O_COLUMNS);
sp->t_rows = sp->t_minrows = O_VAL(sp, O_WINDOW);
+ /*
+ * To avoid segfaults on terminals with only one line,
+ * catch this corner case now and die explicitly.
+ */
+ if (sp->t_rows == 0) {
+ (void)fprintf(stderr, "Error: Screen too small for visual mode.\n");
+ return 1;
+ }
if (sp->rows != 1) {
if (sp->t_rows > sp->rows - 1) {
sp->t_minrows = sp->t_rows = sp->rows - 1;
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