summaryrefslogtreecommitdiff
path: root/drivers/staging/speakup/selection.c
blob: fe1f405d5d70aaa333ac4ebabd49c545cec28990 (plain)
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
144
145
146
147
148
149
150
151
#include <linux/slab.h> /* for kmalloc */
#include <linux/consolemap.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/selection.h>

#include "speakup.h"

/* ------ cut and paste ----- */
/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
#define ishardspace(c)      ((c) == ' ')

unsigned short xs, ys, xe, ye; /* our region points */

/* Variables for selection control. */
/* must not be disallocated */
struct vc_data *spk_sel_cons;
/* cleared by clear_selection */
static int sel_start = -1;
static int sel_end;
static int sel_buffer_lth;
static char *sel_buffer;

static unsigned char sel_pos(int n)
{
	return inverse_translate(spk_sel_cons,
		screen_glyph(spk_sel_cons, n), 0);
}

void speakup_clear_selection(void)
{
	sel_start = -1;
}

/* does screen address p correspond to character at LH/RH edge of screen? */
static int atedge(const int p, int size_row)
{
	return !(p % size_row) || !((p + 2) % size_row);
}

/* constrain v such that v <= u */
static unsigned short limit(const unsigned short v, const unsigned short u)
{
	return (v > u) ? u : v;
}

int speakup_set_selection(struct tty_struct *tty)
{
	int new_sel_start, new_sel_end;
	char *bp, *obp;
	int i, ps, pe;
	struct vc_data *vc = vc_cons[fg_console].d;

	xs = limit(xs, vc->vc_cols - 1);
	ys = limit(ys, vc->vc_rows - 1);
	xe = limit(xe, vc->vc_cols - 1);
	ye = limit(ye, vc->vc_rows - 1);
	ps = ys * vc->vc_size_row + (xs << 1);
	pe = ye * vc->vc_size_row + (xe << 1);

	if (ps > pe) {
		/* make sel_start <= sel_end */
		int tmp = ps;
		ps = pe;
		pe = tmp;
	}

	if (spk_sel_cons != vc_cons[fg_console].d) {
		speakup_clear_selection();
		spk_sel_cons = vc_cons[fg_console].d;
		printk(KERN_WARNING
			"Selection: mark console not the same as cut\n");
		return -EINVAL;
	}

	new_sel_start = ps;
	new_sel_end = pe;

	/* select to end of line if on trailing space */
	if (new_sel_end > new_sel_start &&
	    !atedge(new_sel_end, vc->vc_size_row) &&
	    ishardspace(sel_pos(new_sel_end))) {
		for (pe = new_sel_end + 2; ; pe += 2)
			if (!ishardspace(sel_pos(pe)) ||
			    atedge(pe, vc->vc_size_row))
				break;
		if (ishardspace(sel_pos(pe)))
			new_sel_end = pe;
	}
	if ((new_sel_start == sel_start) && (new_sel_end == sel_end))
		return 0; /* no action required */

	sel_start = new_sel_start;
	sel_end = new_sel_end;
	/* Allocate a new buffer before freeing the old one ... */
	bp = kmalloc((sel_end-sel_start)/2+1, GFP_ATOMIC);
	if (!bp) {
		printk(KERN_WARNING "selection: kmalloc() failed\n");
		speakup_clear_selection();
		return -ENOMEM;
	}
	kfree(sel_buffer);
	sel_buffer = bp;

	obp = bp;
	for (i = sel_start; i <= sel_end; i += 2) {
		*bp = sel_pos(i);
		if (!ishardspace(*bp++))
			obp = bp;
		if (!((i + 2) % vc->vc_size_row)) {
			/* strip trailing blanks from line and add newline,
			   unless non-space at end of line. */
			if (obp != bp) {
				bp = obp;
				*bp++ = '\r';
			}
			obp = bp;
		}
	}
	sel_buffer_lth = bp - sel_buffer;
	return 0;
}

/* TODO: move to some helper thread, probably.  That'd fix having to check for
 * in_atomic().  */
int speakup_paste_selection(struct tty_struct *tty)
{
	struct vc_data *vc = (struct vc_data *) tty->driver_data;
	int pasted = 0, count;
	DECLARE_WAITQUEUE(wait, current);
	add_wait_queue(&vc->paste_wait, &wait);
	while (sel_buffer && sel_buffer_lth > pasted) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (test_bit(TTY_THROTTLED, &tty->flags)) {
			if (in_atomic())
				/* if we are in an interrupt handler, abort */
				break;
			schedule();
			continue;
		}
		count = sel_buffer_lth - pasted;
		count = min_t(int, count, tty->receive_room);
		tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted,
			0, count);
		pasted += count;
	}
	remove_wait_queue(&vc->paste_wait, &wait);
	current->state = TASK_RUNNING;
	return 0;
}