patch 7.4.1643

Problem:    Terminating file name has side effects.
Solution:   Restore the character. (mostly by James McCoy, closes #713)

src/eval.c

@@ -26440,8 +26440,10 @@ repeat:
     if (src[*usedlen] == ':' && src[*usedlen + 1] == 'S')
     {
 	/* vim_strsave_shellescape() needs a NUL terminated string. */
+	c = (*fnamep)[*fnamelen];
 	(*fnamep)[*fnamelen] = NUL;
 	p = vim_strsave_shellescape(*fnamep, FALSE, FALSE);
+	(*fnamep)[*fnamelen] = c;
 	if (p == NULL)
 	    return -1;
 	vim_free(*bufp);

src/testdir/test105.in

@@ -36,6 +36,7 @@ STARTTEST
 :Put fnamemodify('abc''%''def',    ':S'      )
 :Put fnamemodify("abc\ndef",       ':S'      )
 :Put expand('%:r:S') == shellescape(expand('%:r'))
+:Put join([expand('%:r'), expand('%:r:S'), expand('%')], ',')
 :set shell=tcsh
 :Put fnamemodify("abc\ndef",       ':S'      )
 :$put ='vim: ts=8'

src/testdir/test105.ok

@@ -26,5 +26,6 @@ fnamemodify('abc'' ''def',    ':S'      )	'''abc''\'''' ''\''''def'''
 fnamemodify('abc''%''def',    ':S'      )	'''abc''\''''%''\''''def'''
 fnamemodify("abc\ndef",       ':S'      )	'''abc^@def'''
 expand('%:r:S') == shellescape(expand('%:r'))	1
+join([expand('%:r'), expand('%:r:S'), expand('%')], ',')	'test105,''test105'',test105.in'
 fnamemodify("abc\ndef",       ':S'      )	'''abc\^@def'''
 vim: ts=8

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1643,
 /**/
     1642,
 /**/