2009-07-27 Chris Allegretta <chrisa@asty.org>

	* text.c (undo_cut, redo_cut): Don't actually try and undo/redo an empty cut, i.e. the magicline. 
	  Fixes crash on cutting last line discovered by Eitan Adler <eitanadlerlist@gmail.com>.



git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4397 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

+2009-07-27 Chris Allegretta <chrisa@asty.org>
+	* text.c (undo_cut, redo_cut): Don't actually try and undo/redo an empty cut, i.e. the magicline. 
+	  Fixes crash on cutting last line discovered by Eitan Adler <eitanadlerlist@gmail.com>.
+
 2009-07-11 Chris Allegretta <chrisa@asty.org>
 	* nano-regress: Small tweaks
 	* Change undo code to off unless unabled via a command line option (-u/--undo).  Until this code

src/text.c

@@ -360,21 +360,25 @@ void do_unindent(void)
 /* undo a cut, or re-do an uncut */
 void undo_cut(undo *u)
 {
-	cutbuffer = copy_filestruct(u->cutbuffer);
+    /* If we cut the magicline may was well not crash :/ */
+    if (!u->cutbuffer)
+	return;
 
-        /* Compute cutbottom for the uncut using out copy */
-	for (cutbottom = cutbuffer; cutbottom->next != NULL; cutbottom = cutbottom->next)
-	    ;
+    cutbuffer = copy_filestruct(u->cutbuffer);
 
-	/* Get to where we need to uncut from */
-	if (u->mark_set && u->mark_begin_lineno < u->lineno)
-	    do_gotolinecolumn(u->mark_begin_lineno, u->mark_begin_x+1, FALSE, FALSE, FALSE, FALSE);
-	else
-	    do_gotolinecolumn(u->lineno, u->begin+1, FALSE, FALSE, FALSE, FALSE);
+    /* Compute cutbottom for the uncut using out copy */
+    for (cutbottom = cutbuffer; cutbottom->next != NULL; cutbottom = cutbottom->next)
+	;
 
-        copy_from_filestruct(cutbuffer, cutbottom);
-	free_filestruct(cutbuffer);
-	cutbuffer = NULL;
+    /* Get to where we need to uncut from */
+    if (u->mark_set && u->mark_begin_lineno < u->lineno)
+	do_gotolinecolumn(u->mark_begin_lineno, u->mark_begin_x+1, FALSE, FALSE, FALSE, FALSE);
+    else
+	do_gotolinecolumn(u->lineno, u->begin+1, FALSE, FALSE, FALSE, FALSE);
+
+    copy_from_filestruct(cutbuffer, cutbottom);
+    free_filestruct(cutbuffer);
+    cutbuffer = NULL;
 
 }
 
@@ -383,40 +387,44 @@ void redo_cut(undo *u) {
     int i;
     filestruct *t, *c;
 
-	do_gotolinecolumn(u->lineno, u->begin+1, FALSE, FALSE, FALSE, FALSE);
-	openfile->mark_set = u->mark_set;
-	if (cutbuffer)
-	    free(cutbuffer);
-	cutbuffer = NULL;
+    /* If we cut the magicline may was well not crash :/ */
+    if (!u->cutbuffer)
+	return;
 
-	/* Move ahead the same # lines we had if a marked cut */
-	if (u->mark_set) {
-	    for (i = 1, t = openfile->fileage; i != u->mark_begin_lineno; i++)
-		t = t->next;
-	    openfile->mark_begin = t;
-	} else if (!u->to_end) {
-	    /* Here we have a regular old potentially multi-line ^K cut.  We'll
-		need to trick nano into thinking it's a marked cut to cut more
-		than one line again */
-	    for (c = u->cutbuffer, t = openfile->current; c->next != NULL && t->next != NULL; ) {
+    do_gotolinecolumn(u->lineno, u->begin+1, FALSE, FALSE, FALSE, FALSE);
+    openfile->mark_set = u->mark_set;
+    if (cutbuffer)
+	free(cutbuffer);
+    cutbuffer = NULL;
+
+    /* Move ahead the same # lines we had if a marked cut */
+    if (u->mark_set) {
+	for (i = 1, t = openfile->fileage; i != u->mark_begin_lineno; i++)
+	    t = t->next;
+	openfile->mark_begin = t;
+    } else if (!u->to_end) {
+	/* Here we have a regular old potentially multi-line ^K cut.  We'll
+	   need to trick nano into thinking it's a marked cut to cut more
+	   than one line again */
+	for (c = u->cutbuffer, t = openfile->current; c->next != NULL && t->next != NULL; ) {
 
 #ifdef DEBUG
-	    fprintf(stderr, "Advancing, lineno  = %d, data = \"%s\"\n", t->lineno, t->data);
+	fprintf(stderr, "Advancing, lineno  = %d, data = \"%s\"\n", t->lineno, t->data);
 #endif
-		c = c->next;
-		t = t->next;
-	    }
-	    openfile->mark_begin = t;
-	    openfile->mark_begin_x = 0;
-	    openfile->mark_set = TRUE;
-	}
+	    c = c->next;
+	    t = t->next;
+	 }
+	openfile->mark_begin = t;
+ 	openfile->mark_begin_x = 0;
+	openfile->mark_set = TRUE;
+    }
 
-	openfile->mark_begin_x = u->mark_begin_x;
-	do_cut_text(FALSE, u->to_end, TRUE);
-	openfile->mark_set = FALSE;
-        openfile->mark_begin = NULL;
-        openfile->mark_begin_x = 0;
-	edit_refresh_needed = TRUE;
+    openfile->mark_begin_x = u->mark_begin_x;
+    do_cut_text(FALSE, u->to_end, TRUE);
+    openfile->mark_set = FALSE;
+    openfile->mark_begin = NULL;
+    openfile->mark_begin_x = 0;
+    edit_refresh_needed = TRUE;
 }
 
 /* Undo the last thing(s) we did */