1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*	Copyright (c) 1988 AT&T	*/
23*7c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
24*7c478bd9Sstevel@tonic-gate 
25*7c478bd9Sstevel@tonic-gate 
26*7c478bd9Sstevel@tonic-gate /*
27*7c478bd9Sstevel@tonic-gate  * Copyright (c) 1999 by Sun Microsystems, Inc.
28*7c478bd9Sstevel@tonic-gate  * All rights reserved.
29*7c478bd9Sstevel@tonic-gate  */
30*7c478bd9Sstevel@tonic-gate 
31*7c478bd9Sstevel@tonic-gate /*
32*7c478bd9Sstevel@tonic-gate  *	cscope - interactive C symbol or text cross-reference
33*7c478bd9Sstevel@tonic-gate  *
34*7c478bd9Sstevel@tonic-gate  *	command history
35*7c478bd9Sstevel@tonic-gate  */
36*7c478bd9Sstevel@tonic-gate 
37*7c478bd9Sstevel@tonic-gate #include <stdio.h>
38*7c478bd9Sstevel@tonic-gate #include "global.h"
39*7c478bd9Sstevel@tonic-gate 
40*7c478bd9Sstevel@tonic-gate HISTORY *head, *tail, *current;
41*7c478bd9Sstevel@tonic-gate 
42*7c478bd9Sstevel@tonic-gate /* add a cmd to the history list */
43*7c478bd9Sstevel@tonic-gate void
addcmd(int f,char * s)44*7c478bd9Sstevel@tonic-gate addcmd(int f, char *s)
45*7c478bd9Sstevel@tonic-gate {
46*7c478bd9Sstevel@tonic-gate 	HISTORY *h;
47*7c478bd9Sstevel@tonic-gate 
48*7c478bd9Sstevel@tonic-gate 	h = (HISTORY *)mymalloc(sizeof (HISTORY));
49*7c478bd9Sstevel@tonic-gate 	if (tail) {
50*7c478bd9Sstevel@tonic-gate 		tail->next = h;
51*7c478bd9Sstevel@tonic-gate 		h->next = 0;
52*7c478bd9Sstevel@tonic-gate 		h->previous = tail;
53*7c478bd9Sstevel@tonic-gate 		tail = h;
54*7c478bd9Sstevel@tonic-gate 	} else {
55*7c478bd9Sstevel@tonic-gate 		head = tail = h;
56*7c478bd9Sstevel@tonic-gate 		h->next = h->previous = 0;
57*7c478bd9Sstevel@tonic-gate 	}
58*7c478bd9Sstevel@tonic-gate 	h->field = f;
59*7c478bd9Sstevel@tonic-gate 	h->text = stralloc(s);
60*7c478bd9Sstevel@tonic-gate 	current = 0;
61*7c478bd9Sstevel@tonic-gate }
62*7c478bd9Sstevel@tonic-gate 
63*7c478bd9Sstevel@tonic-gate /* return previous history item */
64*7c478bd9Sstevel@tonic-gate 
65*7c478bd9Sstevel@tonic-gate HISTORY *
prevcmd(void)66*7c478bd9Sstevel@tonic-gate prevcmd(void)
67*7c478bd9Sstevel@tonic-gate {
68*7c478bd9Sstevel@tonic-gate 	if (current) {
69*7c478bd9Sstevel@tonic-gate 		if (current->previous)	/* stay on first item */
70*7c478bd9Sstevel@tonic-gate 			return (current = current->previous);
71*7c478bd9Sstevel@tonic-gate 		else
72*7c478bd9Sstevel@tonic-gate 			return (current);
73*7c478bd9Sstevel@tonic-gate 	} else if (tail)
74*7c478bd9Sstevel@tonic-gate 		return (current = tail);
75*7c478bd9Sstevel@tonic-gate 	else
76*7c478bd9Sstevel@tonic-gate 		return (NULL);
77*7c478bd9Sstevel@tonic-gate }
78*7c478bd9Sstevel@tonic-gate 
79*7c478bd9Sstevel@tonic-gate /* return next history item */
80*7c478bd9Sstevel@tonic-gate 
81*7c478bd9Sstevel@tonic-gate HISTORY *
nextcmd(void)82*7c478bd9Sstevel@tonic-gate nextcmd(void)
83*7c478bd9Sstevel@tonic-gate {
84*7c478bd9Sstevel@tonic-gate 	if (current) {
85*7c478bd9Sstevel@tonic-gate 		if (current->next)	/* stay on first item */
86*7c478bd9Sstevel@tonic-gate 			return (current = current->next);
87*7c478bd9Sstevel@tonic-gate 		else
88*7c478bd9Sstevel@tonic-gate 			return (current);
89*7c478bd9Sstevel@tonic-gate 	} else
90*7c478bd9Sstevel@tonic-gate 		return (NULL);
91*7c478bd9Sstevel@tonic-gate }
92*7c478bd9Sstevel@tonic-gate 
93*7c478bd9Sstevel@tonic-gate /* reset current to tail */
94*7c478bd9Sstevel@tonic-gate 
95*7c478bd9Sstevel@tonic-gate void
resetcmd(void)96*7c478bd9Sstevel@tonic-gate resetcmd(void)
97*7c478bd9Sstevel@tonic-gate {
98*7c478bd9Sstevel@tonic-gate 	current = 0;
99*7c478bd9Sstevel@tonic-gate }
100*7c478bd9Sstevel@tonic-gate 
101*7c478bd9Sstevel@tonic-gate HISTORY *
currentcmd(void)102*7c478bd9Sstevel@tonic-gate currentcmd(void)
103*7c478bd9Sstevel@tonic-gate {
104*7c478bd9Sstevel@tonic-gate 	return (current);
105*7c478bd9Sstevel@tonic-gate }
106