commit dc93555c0feee4f52e1535784b9cb02023888d8c
author Bram Moolenaar <Bram@vim.org> Wed Aug 17 15:23:23 2011 +0200
committer Bram Moolenaar <Bram@vim.org> Wed Aug 17 15:23:23 2011 +0200
tree 20bfb331e6b75458970d9b950e92b51f7314b0e5
parent c95e32635c24465e618b67c312bcd0a038632759

updated for version 7.3.281
Problem:    After using "expand('%:8')" the buffer name is changed.
Solution:   Make a copy of the file name before shortening it.

src/eval.c

diff --git a/src/eval.c b/src/eval.c
index 22779e3..e9ab035 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -23205,6 +23205,7 @@
     int		c;
     int		has_fullname = 0;
 #ifdef WIN3264
+    char_u	*fname_start = *fnamep;
     int		has_shortname = 0;
 #endif
 
@@ -23379,24 +23380,25 @@
     }
 
 #ifdef WIN3264
-    /* Check shortname after we have done 'heads' and before we do 'tails'
+    /*
+     * Handle ":8" after we have done 'heads' and before we do 'tails'.
      */
     if (has_shortname)
     {
-	pbuf = NULL;
-	/* Copy the string if it is shortened by :h */
-	if (*fnamelen < (int)STRLEN(*fnamep))
+	/* Copy the string if it is shortened by :h and when it wasn't copied
+	 * yet, because we are going to change it in place.  Avoids changing
+	 * the buffer name for "%:8". */
+	if (*fnamelen < (int)STRLEN(*fnamep) || *fnamep == fname_start)
 	{
 	    p = vim_strnsave(*fnamep, *fnamelen);
-	    if (p == 0)
+	    if (p == NULL)
 		return -1;
 	    vim_free(*bufp);
 	    *bufp = *fnamep = p;
 	}
 
 	/* Split into two implementations - makes it easier.  First is where
-	 * there isn't a full name already, second is where there is.
-	 */
+	 * there isn't a full name already, second is where there is. */
 	if (!has_fullname && !vim_isAbsName(*fnamep))
 	{
 	    if (shortpath_for_partial(fnamep, bufp, fnamelen) == FAIL)
@@ -23404,18 +23406,16 @@
 	}
 	else
 	{
-	    int		l;
+	    int		l = *fnamelen;
 
-	    /* Simple case, already have the full-name
+	    /* Simple case, already have the full-name.
 	     * Nearly always shorter, so try first time. */
-	    l = *fnamelen;
 	    if (get_short_pathname(fnamep, bufp, &l) == FAIL)
 		return -1;
 
 	    if (l == 0)
 	    {
-		/* Couldn't find the filename.. search the paths.
-		 */
+		/* Couldn't find the filename, search the paths. */
 		l = *fnamelen;
 		if (shortpath_for_invalid_fname(fnamep, bufp, &l) == FAIL)
 		    return -1;

src/version.c

diff --git a/src/version.c b/src/version.c
index 1330376..35a5479 100644
--- a/src/version.c
+++ b/src/version.c
@@ -710,6 +710,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    281,
+/**/
     280,
 /**/
     279,