aboutsummaryrefslogtreecommitdiffstats
path: root/usr.bin/vi/vi/v_z.c
blob: ebae985f99c7efa0b9f3003f8994d37b027a99aa (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
/*-
 * Copyright (c) 1992, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)v_z.c	8.11 (Berkeley) 3/8/94";
#endif /* not lint */

#include <sys/types.h>
#include <queue.h>
#include <sys/time.h>

#include <bitstring.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <termios.h>

#include <db.h>
#include <regex.h>

#include "vi.h"
#include "vcmd.h"

/*
 * v_z -- [count]z[count][-.+^<CR>]
 *	Move the screen.
 */
int
v_z(sp, ep, vp)
	SCR *sp;
	EXF *ep;
	VICMDARG *vp;
{
	recno_t last, lno;
	u_int value;

	/*
	 * The first count is the line to use.  If the value doesn't
	 * exist, use the last line.
	 */
	if (F_ISSET(vp, VC_C1SET)) {
		lno = vp->count;
		if (file_lline(sp, ep, &last))
			return (1);
		if (lno > last)
			lno = last;
	} else
		lno = vp->m_start.lno;

	/* Set default return cursor values. */
	vp->m_final.lno = lno;
	vp->m_final.cno = vp->m_start.cno;

	/*
	 * The second count is the displayed window size, i.e. the 'z'
	 * command is another way to get artificially small windows.
	 *
	 * !!!
	 * A window size of 0 was historically allowed, and simply ignored.
	 * Also, this could be much more simply done by modifying the value
	 * of the O_WINDOW option, but that's not how it worked historically.
	 */
	if (F_ISSET(vp, VC_C2SET) &&
	    vp->count2 != 0 && sp->s_crel(sp, vp->count2))
		return (1);

	switch (vp->character) {
	case '-':		/* Put the line at the bottom. */
		if (sp->s_fill(sp, ep, lno, P_BOTTOM))
			return (1);
		break;
	case '.':		/* Put the line in the middle. */
		if (sp->s_fill(sp, ep, lno, P_MIDDLE))
			return (1);
		break;
	default:		/* Put the line at the top for <cr>. */
		value = term_key_val(sp, vp->character);
		if (value != K_CR && value != K_NL) {
			msgq(sp, M_ERR, "usage: %s.", vp->kp->usage);
			return (1);
		}
		/* FALLTHROUGH */
	case '+':		/* Put the line at the top. */
		if (sp->s_fill(sp, ep, lno, P_TOP))
			return (1);
		break;
	case '^':		/* Print the screen before the z- screen. */
		/*
		 * !!!
		 * Historic practice isn't real clear on this one.  It seems
		 * that the command "70z^" is the same as ":70<cr>z-z^" with
		 * an off-by-one difference.  So, until I find documentation
		 * to the contrary, the z^ command in this implementation
		 * displays the screen immediately before the current one.
		 * Fill the screen with the selected line at the bottom, then,
		 * scroll the screen down a page, and move to the middle line
		 * of the screen.  Historic vi moved the cursor to some random
		 * place in the screen, as far as I can tell.
		 */
		if (sp->s_fill(sp, ep, lno, P_BOTTOM))
			return (1);
		if (sp->s_down(sp, ep, &vp->m_final, sp->t_maxrows - 1, 1))
			return (1);
		if (sp->s_position(sp, ep, &vp->m_final, 0, P_MIDDLE))
			return (1);
		break;
	}

	/* If the map changes, have to redraw the entire screen. */
	F_SET(sp, S_REDRAW);

	return (0);
}