1 /* $NetBSD: v_z.c,v 1.3 2014/01/26 21:43:45 christos Exp $ */
2 /*-
3 * Copyright (c) 1992, 1993, 1994
4 * The Regents of the University of California. All rights reserved.
5 * Copyright (c) 1992, 1993, 1994, 1995, 1996
6 * Keith Bostic. All rights reserved.
7 *
8 * See the LICENSE file for redistribution information.
9 */
10
11 #include "config.h"
12
13 #include <sys/cdefs.h>
14 #if 0
15 #ifndef lint
16 static const char sccsid[] = "Id: v_z.c,v 10.12 2001/06/25 15:19:36 skimo Exp (Berkeley) Date: 2001/06/25 15:19:36 ";
17 #endif /* not lint */
18 #else
19 __RCSID("$NetBSD: v_z.c,v 1.3 2014/01/26 21:43:45 christos Exp $");
20 #endif
21
22 #include <sys/types.h>
23 #include <sys/queue.h>
24 #include <sys/time.h>
25
26 #include <bitstring.h>
27 #include <limits.h>
28 #include <stdio.h>
29
30 #include "../common/common.h"
31 #include "vi.h"
32
33 /*
34 * v_z -- [count]z[count][-.+^<CR>]
35 * Move the screen.
36 *
37 * PUBLIC: int v_z __P((SCR *, VICMD *));
38 */
39 int
v_z(SCR * sp,VICMD * vp)40 v_z(SCR *sp, VICMD *vp)
41 {
42 db_recno_t lno;
43 e_key_t value;
44
45 /*
46 * The first count is the line to use. If the value doesn't
47 * exist, use the last line.
48 */
49 if (F_ISSET(vp, VC_C1SET)) {
50 lno = vp->count;
51 if (!db_exist(sp, lno) && db_last(sp, &lno))
52 return (1);
53 } else
54 lno = vp->m_start.lno;
55
56 /* Set default return cursor line. */
57 vp->m_final.lno = lno;
58 vp->m_final.cno = vp->m_start.cno;
59
60 /*
61 * The second count is the displayed window size, i.e. the 'z' command
62 * is another way to get artificially small windows. Note, you can't
63 * grow beyond the size of the window.
64 *
65 * !!!
66 * A window size of 0 was historically allowed, and simply ignored.
67 * This could be much more simply done by modifying the value of the
68 * O_WINDOW option, but that's not how it worked historically.
69 */
70 if (F_ISSET(vp, VC_C2SET) && vp->count2 != 0) {
71 if (vp->count2 > O_VAL(sp, O_WINDOW))
72 vp->count2 = O_VAL(sp, O_WINDOW);
73 if (vs_crel(sp, vp->count2))
74 return (1);
75 }
76
77 switch (vp->character) {
78 case '-': /* Put the line at the bottom. */
79 if (vs_sm_fill(sp, lno, P_BOTTOM))
80 return (1);
81 break;
82 case '.': /* Put the line in the middle. */
83 if (vs_sm_fill(sp, lno, P_MIDDLE))
84 return (1);
85 break;
86 case '+':
87 /*
88 * If the user specified a line number, put that line at the
89 * top and move the cursor to it. Otherwise, scroll forward
90 * a screen from the current screen.
91 */
92 if (F_ISSET(vp, VC_C1SET)) {
93 if (vs_sm_fill(sp, lno, P_TOP))
94 return (1);
95 if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
96 return (1);
97 } else
98 if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_PLUS))
99 return (1);
100 break;
101 case '^':
102 /*
103 * If the user specified a line number, put that line at the
104 * bottom, move the cursor to it, and then display the screen
105 * before that one. Otherwise, scroll backward a screen from
106 * the current screen.
107 *
108 * !!!
109 * Note, we match the off-by-one characteristics of historic
110 * vi, here.
111 */
112 if (F_ISSET(vp, VC_C1SET)) {
113 if (vs_sm_fill(sp, lno, P_BOTTOM))
114 return (1);
115 if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
116 return (1);
117 if (vs_sm_fill(sp, vp->m_final.lno, P_BOTTOM))
118 return (1);
119 } else
120 if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_CARAT))
121 return (1);
122 break;
123 default: /* Put the line at the top for <cr>. */
124 value = KEY_VAL(sp, vp->character);
125 if (value != K_CR && value != K_NL) {
126 v_emsg(sp, vp->kp->usage, VIM_USAGE);
127 return (1);
128 }
129 if (vs_sm_fill(sp, lno, P_TOP))
130 return (1);
131 break;
132 }
133 return (0);
134 }
135
136 /*
137 * vs_crel --
138 * Change the relative size of the current screen.
139 *
140 * PUBLIC: int vs_crel __P((SCR *, long));
141 */
142 int
vs_crel(SCR * sp,long int count)143 vs_crel(SCR *sp, long int count)
144 {
145 sp->t_minrows = sp->t_rows = count;
146 if (sp->t_rows > sp->rows - 1)
147 sp->t_minrows = sp->t_rows = sp->rows - 1;
148 TMAP = HMAP + (sp->t_rows - 1);
149 F_SET(sp, SC_SCR_REDRAW);
150 return (0);
151 }
152