bin/ed/undo.c

35 static undo_t *ustack = NULL;			/* undo stack */
46 	if (ustack == NULL &&
47 	    (ustack = (undo_t *) malloc((usize = USIZE) * sizeof(undo_t))) == NULL) {
53 	t = ustack;
55 	    (t = (undo_t *) realloc(ustack, (usize += USIZE) * sizeof(undo_t))) != NULL) {
56 		ustack = t;
57 		ustack[u_p].type = type;
58 		ustack[u_p].t = get_addressed_line_node(to);
59 		ustack[u_p].h = get_addressed_line_node(from);
60 		return ustack + u_p++;
66 	free(ustack);
67 	ustack = NULL;
99 		switch(ustack[n].type) {
101 			REQUE(ustack[n].h->q_back, ustack[n].t->q_forw);
104 			REQUE(ustack[n].h->q_back, ustack[n].h);
105 			REQUE(ustack[n].t, ustack[n].t->q_forw);
109 			REQUE(ustack[n - 1].h, ustack[n].h->q_forw);
110 			REQUE(ustack[n].t->q_back, ustack[n - 1].t);
111 			REQUE(ustack[n].h, ustack[n].t);
118 		ustack[n].type ^= 1;
122 		USWAP(ustack[n], ustack[u_p - 1 - n]);
139 		if (ustack[u_p].type == UDEL) {
140 			ep = ustack[u_p].t->q_forw;
141 			for (lp = ustack[u_p].h; lp != ep; lp = tl) {