Allowing the parameter of free_filestruct() to be NULL,

so we can delete four annoying pre-checks.


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5651 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

 2016-02-18  Benno Schulenberg  <bensberg@justemail.net>
 	* src/search.c (do_replace_loop), src/text.c (do_int_spell_fix),
 	src/winio.c (edit_refresh): Fix Savannah bug #47127 the proper way.
+	* src/nano.c (free_filestruct): Allow the parameter to be NULL.
 
 2016-02-16  Benno Schulenberg  <bensberg@justemail.net>
 	* src/files.c (initialize_buffer_text): Delete redundant assignment.

src/cut.c

@@ -134,9 +134,8 @@ void do_cut_text(
 
     assert(openfile->current != NULL && openfile->current->data != NULL);
 
-    /* If keep_cutbuffer is FALSE and the cutbuffer isn't empty, blow
-     * away the text in the cutbuffer. */
-    if (!keep_cutbuffer && cutbuffer != NULL) {
+    /* Empty the cutbuffer when a chain of cuts is broken. */
+    if (!keep_cutbuffer) {
 	free_filestruct(cutbuffer);
 	cutbuffer = NULL;
 #ifdef DEBUG

src/nano.c

@@ -163,10 +163,11 @@ filestruct *copy_filestruct(const filestruct *src)
     return head;
 }
 
-/* Free a filestruct. */
+/* Free a whole linked list of filestructs. */
 void free_filestruct(filestruct *src)
 {
-    assert(src != NULL);
+    if (src == NULL)
+	return;
 
     while (src->next != NULL) {
 	src = src->next;
@@ -364,8 +365,7 @@ void move_to_filestruct(filestruct **file_top, filestruct **file_bot,
 	    *file_bot = openfile->filebot;
 	}
 
-	openfile->fileage->next = NULL;
-	free_filestruct(openfile->fileage);
+	delete_node(openfile->fileage);
 
 	/* Renumber starting with the line after the original
 	 * file_bot. */

src/text.c

@@ -459,8 +459,7 @@ void redo_cut(undo *u)
     openfile->mark_set = FALSE;
     openfile->mark_begin = NULL;
 
-    if (cutbuffer != NULL)
-	free_filestruct(cutbuffer);
+    free_filestruct(cutbuffer);
     cutbuffer = oldcutbuffer;
     cutbottom = oldcutbottom;
 }
@@ -579,8 +578,7 @@ void do_undo(void)
 	openfile->mark_set = TRUE;
 	goto_line_posx(u->lineno, u->begin);
 	cut_marked();
-	if (u->cutbuffer != NULL)
-	    free_filestruct(u->cutbuffer);
+	free_filestruct(u->cutbuffer);
 	u->cutbuffer = cutbuffer;
 	u->cutbottom = cutbottom;
 	cutbuffer = oldcutbuffer;
@@ -903,8 +901,7 @@ void discard_until(const undo *thisitem, openfilestruct *thefile)
     while (dropit != NULL && dropit != thisitem) {
 	thefile->undotop = dropit->next;
 	free(dropit->strdata);
-	if (dropit->cutbuffer != NULL)
-	    free_filestruct(dropit->cutbuffer);
+	free_filestruct(dropit->cutbuffer);
 	free(dropit);
 	dropit = thefile->undotop;
     }
@@ -1113,8 +1110,7 @@ fprintf(stderr, "  >> Updating... action = %d, openfile->last_action = %d, openf
     case CUT:
 	if (!cutbuffer)
 	    break;
-	if (u->cutbuffer)
-	    free_filestruct(u->cutbuffer);
+	free_filestruct(u->cutbuffer);
 	u->cutbuffer = copy_filestruct(cutbuffer);
 	if (u->mark_set) {
 	    /* If the "marking" operation was from right-->left or