From: Illia Bobyr <illia.bobyr@gmail.com>
Date: Thu, 2 Jul 2026 18:28:59 +0000 (+0000)
Subject: patch 9.2.0766: quick_tab entries for empty letters point to the wrong index
X-Git-Tag: v9.2.0766^0
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e068a12f9fde92079b1770dd8bc2df6867dec7ef;p=thirdparty%2Fvim.git

patch 9.2.0766: quick_tab entries for empty letters point to the wrong index

Problem:  Letters with no options (like "y" and "z") have their
          quick_tab entry left at 0, so lookups for those letters start
          scanning at options[0] instead of failing fast.
Solution: Set entries for letters with no option names to the last-option
          index, so such lookups stop immediately (Illia Bobyr)

closes: #20684

Signed-off-by: Illia Bobyr <illia.bobyr@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
---

diff --git a/src/option.c b/src/option.c
index d15cc3f3c5..9d291d1809 100644
--- a/src/option.c
+++ b/src/option.c
@@ -5587,9 +5587,19 @@ findoption(char_u *arg)
     // letter.  There are 26 letters, plus the first "t_" option.
     if (quick_tab[1] == 0)
     {
+	// Make sure we do not leave any entries uninitialized, even if we have
+	// no options that start with a particular letter.
+	int last_opt_idx;
+	for (last_opt_idx = 0; options[last_opt_idx].fullname != NULL;
+		last_opt_idx++)
+	    ;
+	for (int tab_idx = 1; tab_idx < 27; tab_idx++)
+	    quick_tab[tab_idx] = last_opt_idx;
+
 	p = options[0].fullname;
-	for (opt_idx = 1; (s = options[opt_idx].fullname) != NULL; opt_idx++)
+	for (opt_idx = 1; opt_idx < last_opt_idx; opt_idx++)
 	{
+	    s = options[opt_idx].fullname;
 	    if (s[0] != p[0])
 	    {
 		if (s[0] == 't' && s[1] == '_')
diff --git a/src/version.c b/src/version.c
index dd14dedba2..2c531eb5bc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -759,6 +759,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    766,
 /**/
     765,
 /**/