Getting out if there is nothing to renumber,

to prevent do_undo() from falling over when trying to renumber emptiness.
Patch basically by Mark Majeres.


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5137 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

+2015-03-14  Mark Majeres  <mark@engine12.com>
+	* src/nano.c (renumber): Get out if there is nothing to renumber.
+	This prevents do_undo() from falling over when trying to renumber
+	emptiness.  This fixes Savannah bug #44488, reported by Dennis.
+
 2015-03-08  Benno Schulenberg  <bensberg@justemail.net>
 	* src/proto.h, src/nano.c: Fix compilation with --enable-tiny plus
 	--enable-nanorc.

src/nano.c

@@ -178,7 +178,8 @@ void renumber(filestruct *fileptr)
 {
     ssize_t line;
 
-    assert(fileptr != NULL);
+    if (fileptr == NULL)
+	return;
 
     line = (fileptr->prev == NULL) ? 0 : fileptr->prev->lineno;
 
@@ -365,8 +366,7 @@ void move_to_filestruct(filestruct **file_top, filestruct **file_bot,
 
 	/* Renumber starting with the line after the original
 	 * file_bot. */
-	if (file_bot_save->next != NULL)
-	    renumber(file_bot_save->next);
+	renumber(file_bot_save->next);
     }
 
     /* Since the text has now been saved, remove it from the

src/search.c

@@ -1373,8 +1373,7 @@ void update_history(filestruct **h, const char *s)
 	bar = p->next;
 	unlink_node(foo);
 	delete_node(foo);
-	if (bar != NULL)
-	    renumber(bar);
+	renumber(bar);
     }
 
     /* If the history is full, delete the beginning entry to make room