ex_range: fix handling of escaped backslashes.

If there are two consecutive backslashes, skip past both so the
second is not mistakenly treated as an escape character.
This is consistent with how escaped backslashes are treated
in ex_substitute() and global().  From Bosco G. G.

diff --git a/usr.bin/vi/common/search.c b/usr.bin/vi/common/search.c
index 03328b7..4224e02 100644 (file)
--- a/usr.bin/vi/common/search.c
+++ b/usr.bin/vi/common/search.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: search.c,v 1.14 2016/08/14 21:47:16 guenther Exp $    */
+/*     $OpenBSD: search.c,v 1.15 2022/12/10 16:06:18 millert Exp $     */
 
 /*-
  * Copyright (c) 1992, 1993, 1994
@@ -104,9 +104,14 @@ prev:                      if (sp->re == NULL) {
                                        ++p;
                                break;
                        }
-                       if (plen > 1 && p[0] == '\\' && p[1] == delim) {
-                               ++p;
-                               --plen;
+                       if (plen > 1 && p[0] == '\\') {
+                               if (p[1] == delim) {
+                                       ++p;
+                                       --plen;
+                               } else if (p[1] == '\\') {
+                                       *t++ = *p++;
+                                       --plen;
+                               }
                        }
                }
                if (epp != NULL)