From bef4790c236327ebb77cd438d49ac9b8e7dc6542 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Fri, 6 Jul 2012 16:49:40 +0200
Subject: [PATCH] updated for version 7.3.589 Problem:    Crash when $HOME is
 not set. Solution:   Check for a NULL pointer. (Chris Webb)

---
 src/misc1.c   | 8 +++++---
 src/version.c | 2 ++
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/misc1.c b/src/misc1.c
index 99881dccd..348227206 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -4496,8 +4496,12 @@ home_replace(buf, src, dst, dstlen, one)
 #else
     homedir_env_orig = homedir_env = mch_getenv((char_u *)"HOME");
 #endif
+    /* Empty is the same as not set. */
+    if (homedir_env != NULL && *homedir_env == NUL)
+	homedir_env = NULL;
+
 #if defined(FEAT_MODIFY_FNAME) || defined(WIN3264)
-    if (vim_strchr(homedir_env, '~') != NULL)
+    if (homedir_env != NULL && vim_strchr(homedir_env, '~') != NULL)
     {
 	int	usedlen = 0;
 	int	flen;
@@ -4513,8 +4517,6 @@ home_replace(buf, src, dst, dstlen, one)
     }
 #endif
 
-    if (homedir_env != NULL && *homedir_env == NUL)
-	homedir_env = NULL;
     if (homedir_env != NULL)
 	envlen = STRLEN(homedir_env);
 
diff --git a/src/version.c b/src/version.c
index 2676fa7fc..0acbce0ab 100644
--- a/src/version.c
+++ b/src/version.c
@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    589,
 /**/
     588,
 /**/