tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/slab.h> /* for kmalloc */
2#include <linux/consolemap.h>
3#include <linux/interrupt.h>
4#include <linux/sched.h>
5#include <linux/device.h> /* for dev_warn */
6#include <linux/selection.h>
7#include <linux/workqueue.h>
8#include <linux/tty.h>
9#include <linux/tty_flip.h>
10#include <asm/cmpxchg.h>
11
12#include "speakup.h"
13
14/* ------ cut and paste ----- */
15/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
16#define ishardspace(c) ((c) == ' ')
17
18unsigned short spk_xs, spk_ys, spk_xe, spk_ye; /* our region points */
19
20/* Variables for selection control. */
21/* must not be deallocated */
22struct vc_data *spk_sel_cons;
23/* cleared by clear_selection */
24static int sel_start = -1;
25static int sel_end;
26static int sel_buffer_lth;
27static char *sel_buffer;
28
29static unsigned char sel_pos(int n)
30{
31 return inverse_translate(spk_sel_cons,
32 screen_glyph(spk_sel_cons, n), 0);
33}
34
35void speakup_clear_selection(void)
36{
37 sel_start = -1;
38}
39
40/* does screen address p correspond to character at LH/RH edge of screen? */
41static int atedge(const int p, int size_row)
42{
43 return !(p % size_row) || !((p + 2) % size_row);
44}
45
46/* constrain v such that v <= u */
47static unsigned short limit(const unsigned short v, const unsigned short u)
48{
49 return (v > u) ? u : v;
50}
51
52int speakup_set_selection(struct tty_struct *tty)
53{
54 int new_sel_start, new_sel_end;
55 char *bp, *obp;
56 int i, ps, pe;
57 struct vc_data *vc = vc_cons[fg_console].d;
58
59 spk_xs = limit(spk_xs, vc->vc_cols - 1);
60 spk_ys = limit(spk_ys, vc->vc_rows - 1);
61 spk_xe = limit(spk_xe, vc->vc_cols - 1);
62 spk_ye = limit(spk_ye, vc->vc_rows - 1);
63 ps = spk_ys * vc->vc_size_row + (spk_xs << 1);
64 pe = spk_ye * vc->vc_size_row + (spk_xe << 1);
65
66 if (ps > pe) {
67 /* make sel_start <= sel_end */
68 int tmp = ps;
69 ps = pe;
70 pe = tmp;
71 }
72
73 if (spk_sel_cons != vc_cons[fg_console].d) {
74 speakup_clear_selection();
75 spk_sel_cons = vc_cons[fg_console].d;
76 dev_warn(tty->dev,
77 "Selection: mark console not the same as cut\n");
78 return -EINVAL;
79 }
80
81 new_sel_start = ps;
82 new_sel_end = pe;
83
84 /* select to end of line if on trailing space */
85 if (new_sel_end > new_sel_start &&
86 !atedge(new_sel_end, vc->vc_size_row) &&
87 ishardspace(sel_pos(new_sel_end))) {
88 for (pe = new_sel_end + 2; ; pe += 2)
89 if (!ishardspace(sel_pos(pe)) ||
90 atedge(pe, vc->vc_size_row))
91 break;
92 if (ishardspace(sel_pos(pe)))
93 new_sel_end = pe;
94 }
95 if ((new_sel_start == sel_start) && (new_sel_end == sel_end))
96 return 0; /* no action required */
97
98 sel_start = new_sel_start;
99 sel_end = new_sel_end;
100 /* Allocate a new buffer before freeing the old one ... */
101 bp = kmalloc((sel_end-sel_start)/2+1, GFP_ATOMIC);
102 if (!bp) {
103 speakup_clear_selection();
104 return -ENOMEM;
105 }
106 kfree(sel_buffer);
107 sel_buffer = bp;
108
109 obp = bp;
110 for (i = sel_start; i <= sel_end; i += 2) {
111 *bp = sel_pos(i);
112 if (!ishardspace(*bp++))
113 obp = bp;
114 if (!((i + 2) % vc->vc_size_row)) {
115 /* strip trailing blanks from line and add newline,
116 unless non-space at end of line. */
117 if (obp != bp) {
118 bp = obp;
119 *bp++ = '\r';
120 }
121 obp = bp;
122 }
123 }
124 sel_buffer_lth = bp - sel_buffer;
125 return 0;
126}
127
128struct speakup_paste_work {
129 struct work_struct work;
130 struct tty_struct *tty;
131};
132
133static void __speakup_paste_selection(struct work_struct *work)
134{
135 struct speakup_paste_work *spw =
136 container_of(work, struct speakup_paste_work, work);
137 struct tty_struct *tty = xchg(&spw->tty, NULL);
138 struct vc_data *vc = (struct vc_data *) tty->driver_data;
139 int pasted = 0, count;
140 struct tty_ldisc *ld;
141 DECLARE_WAITQUEUE(wait, current);
142
143 ld = tty_ldisc_ref_wait(tty);
144 tty_buffer_lock_exclusive(&vc->port);
145
146 add_wait_queue(&vc->paste_wait, &wait);
147 while (sel_buffer && sel_buffer_lth > pasted) {
148 set_current_state(TASK_INTERRUPTIBLE);
149 if (test_bit(TTY_THROTTLED, &tty->flags)) {
150 schedule();
151 continue;
152 }
153 count = sel_buffer_lth - pasted;
154 count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL,
155 count);
156 pasted += count;
157 }
158 remove_wait_queue(&vc->paste_wait, &wait);
159 current->state = TASK_RUNNING;
160
161 tty_buffer_unlock_exclusive(&vc->port);
162 tty_ldisc_deref(ld);
163 tty_kref_put(tty);
164}
165
166static struct speakup_paste_work speakup_paste_work = {
167 .work = __WORK_INITIALIZER(speakup_paste_work.work,
168 __speakup_paste_selection)
169};
170
171int speakup_paste_selection(struct tty_struct *tty)
172{
173 if (cmpxchg(&speakup_paste_work.tty, NULL, tty) != NULL)
174 return -EBUSY;
175
176 tty_kref_get(tty);
177 schedule_work_on(WORK_CPU_UNBOUND, &speakup_paste_work.work);
178 return 0;
179}
180
181void speakup_cancel_paste(void)
182{
183 cancel_work_sync(&speakup_paste_work.work);
184 tty_kref_put(speakup_paste_work.tty);
185}