1 /* $OpenBSD: v_z.c,v 1.6 2014/11/12 04:28:41 bentley Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 * Copyright (c) 1992, 1993, 1994, 1995, 1996
7 * Keith Bostic. All rights reserved.
8 *
9 * See the LICENSE file for redistribution information.
10 */
11
12 #include "config.h"
13
14 #include <sys/types.h>
15 #include <sys/queue.h>
16 #include <sys/time.h>
17
18 #include <bitstring.h>
19 #include <limits.h>
20 #include <stdio.h>
21
22 #include "../common/common.h"
23 #include "vi.h"
24
25 /*
26 * v_z -- [count]z[count][-.+^<CR>]
27 * Move the screen.
28 *
29 * PUBLIC: int v_z(SCR *, VICMD *);
30 */
31 int
v_z(SCR * sp,VICMD * vp)32 v_z(SCR *sp, VICMD *vp)
33 {
34 recno_t lno;
35 u_int value;
36
37 /*
38 * The first count is the line to use. If the value doesn't
39 * exist, use the last line.
40 */
41 if (F_ISSET(vp, VC_C1SET)) {
42 lno = vp->count;
43 if (!db_exist(sp, lno) && db_last(sp, &lno))
44 return (1);
45 } else
46 lno = vp->m_start.lno;
47
48 /* Set default return cursor line. */
49 vp->m_final.lno = lno;
50 vp->m_final.cno = vp->m_start.cno;
51
52 /*
53 * The second count is the displayed window size, i.e. the 'z' command
54 * is another way to get artificially small windows. Note, you can't
55 * grow beyond the size of the window.
56 *
57 * !!!
58 * A window size of 0 was historically allowed, and simply ignored.
59 * This could be much more simply done by modifying the value of the
60 * O_WINDOW option, but that's not how it worked historically.
61 */
62 if (F_ISSET(vp, VC_C2SET) && vp->count2 != 0) {
63 if (vp->count2 > O_VAL(sp, O_WINDOW))
64 vp->count2 = O_VAL(sp, O_WINDOW);
65 if (vs_crel(sp, vp->count2))
66 return (1);
67 }
68
69 switch (vp->character) {
70 case '-': /* Put the line at the bottom. */
71 if (vs_sm_fill(sp, lno, P_BOTTOM))
72 return (1);
73 break;
74 case '.': /* Put the line in the middle. */
75 if (vs_sm_fill(sp, lno, P_MIDDLE))
76 return (1);
77 break;
78 case '+':
79 /*
80 * If the user specified a line number, put that line at the
81 * top and move the cursor to it. Otherwise, scroll forward
82 * a screen from the current screen.
83 */
84 if (F_ISSET(vp, VC_C1SET)) {
85 if (vs_sm_fill(sp, lno, P_TOP))
86 return (1);
87 if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
88 return (1);
89 } else
90 if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_PLUS))
91 return (1);
92 break;
93 case '^':
94 /*
95 * If the user specified a line number, put that line at the
96 * bottom, move the cursor to it, and then display the screen
97 * before that one. Otherwise, scroll backward a screen from
98 * the current screen.
99 *
100 * !!!
101 * Note, we match the off-by-one characteristics of historic
102 * vi, here.
103 */
104 if (F_ISSET(vp, VC_C1SET)) {
105 if (vs_sm_fill(sp, lno, P_BOTTOM))
106 return (1);
107 if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
108 return (1);
109 if (vs_sm_fill(sp, vp->m_final.lno, P_BOTTOM))
110 return (1);
111 } else
112 if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_CARAT))
113 return (1);
114 break;
115 default: /* Put the line at the top for <cr>. */
116 value = KEY_VAL(sp, vp->character);
117 if (value != K_CR && value != K_NL) {
118 v_emsg(sp, vp->kp->usage, VIM_USAGE);
119 return (1);
120 }
121 if (vs_sm_fill(sp, lno, P_TOP))
122 return (1);
123 break;
124 }
125 return (0);
126 }
127
128 /*
129 * vs_crel --
130 * Change the relative size of the current screen.
131 *
132 * PUBLIC: int vs_crel(SCR *, long);
133 */
134 int
vs_crel(SCR * sp,long count)135 vs_crel(SCR *sp, long count)
136 {
137 sp->t_minrows = sp->t_rows = count;
138 if (sp->t_rows > sp->rows - 1)
139 sp->t_minrows = sp->t_rows = sp->rows - 1;
140 TMAP = HMAP + (sp->t_rows - 1);
141 F_SET(sp, SC_SCR_REDRAW);
142 return (0);
143 }
144