From: Eli Zaretskii <eliz@gnu.org>
Date: Sat, 22 Jun 2019 08:59:16 +0000 (+0300)
Subject: Fix an off-by-one error in assertion
X-Git-Tag: emacs-27.0.90~2329
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=d79fe1f7772a3ea6f998aeab10fe845f14493084;p=emacs.git

Fix an off-by-one error in assertion

* src/fileio.c (Fexpand_file_name): Fix off-by-one error in an
assertion.  This avoids assertion violations when the home
directory is an empty string for some reason.  (Bug#36363)
---

diff --git a/src/fileio.c b/src/fileio.c
index b141f568d70..5dd14daacb4 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -1316,7 +1316,7 @@ the root directory.  */)
 
   /* Now concatenate the directory and name to new space in the stack frame.  */
   tlen = length + file_name_as_directory_slop + (nmlim - nm) + 1;
-  eassert (tlen > file_name_as_directory_slop + 1);
+  eassert (tlen >= file_name_as_directory_slop + 1);
 #ifdef DOS_NT
   /* Reserve space for drive specifier and escape prefix, since either
      or both may need to be inserted.  (The Microsoft x86 compiler