1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/slab.h> /* for kmalloc */
3 #include <linux/consolemap.h>
4 #include <linux/interrupt.h>
5 #include <linux/sched.h>
6 #include <linux/device.h> /* for dev_warn */
7 #include <linux/selection.h>
8 #include <linux/workqueue.h>
10 #include <linux/tty_flip.h>
11 #include <linux/atomic.h>
15 /* ------ cut and paste ----- */
16 /* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
17 #define ishardspace(c) ((c) == ' ')
19 unsigned short spk_xs, spk_ys, spk_xe, spk_ye; /* our region points */
21 /* Variables for selection control. */
22 /* must not be deallocated */
23 struct vc_data *spk_sel_cons;
24 /* cleared by clear_selection */
25 static int sel_start = -1;
27 static int sel_buffer_lth;
28 static char *sel_buffer;
30 static unsigned char sel_pos(int n)
32 return inverse_translate(spk_sel_cons,
33 screen_glyph(spk_sel_cons, n), 0);
36 void speakup_clear_selection(void)
41 /* does screen address p correspond to character at LH/RH edge of screen? */
42 static int atedge(const int p, int size_row)
44 return !(p % size_row) || !((p + 2) % size_row);
47 /* constrain v such that v <= u */
48 static unsigned short limit(const unsigned short v, const unsigned short u)
50 return (v > u) ? u : v;
53 int speakup_set_selection(struct tty_struct *tty)
55 int new_sel_start, new_sel_end;
58 struct vc_data *vc = vc_cons[fg_console].d;
60 spk_xs = limit(spk_xs, vc->vc_cols - 1);
61 spk_ys = limit(spk_ys, vc->vc_rows - 1);
62 spk_xe = limit(spk_xe, vc->vc_cols - 1);
63 spk_ye = limit(spk_ye, vc->vc_rows - 1);
64 ps = spk_ys * vc->vc_size_row + (spk_xs << 1);
65 pe = spk_ye * vc->vc_size_row + (spk_xe << 1);
68 /* make sel_start <= sel_end */
75 if (spk_sel_cons != vc_cons[fg_console].d) {
76 speakup_clear_selection();
77 spk_sel_cons = vc_cons[fg_console].d;
79 "Selection: mark console not the same as cut\n");
86 /* select to end of line if on trailing space */
87 if (new_sel_end > new_sel_start &&
88 !atedge(new_sel_end, vc->vc_size_row) &&
89 ishardspace(sel_pos(new_sel_end))) {
90 for (pe = new_sel_end + 2; ; pe += 2)
91 if (!ishardspace(sel_pos(pe)) ||
92 atedge(pe, vc->vc_size_row))
94 if (ishardspace(sel_pos(pe)))
97 if ((new_sel_start == sel_start) && (new_sel_end == sel_end))
98 return 0; /* no action required */
100 sel_start = new_sel_start;
101 sel_end = new_sel_end;
102 /* Allocate a new buffer before freeing the old one ... */
103 bp = kmalloc((sel_end - sel_start) / 2 + 1, GFP_ATOMIC);
105 speakup_clear_selection();
112 for (i = sel_start; i <= sel_end; i += 2) {
114 if (!ishardspace(*bp++))
116 if (!((i + 2) % vc->vc_size_row)) {
117 /* strip trailing blanks from line and add newline,
118 * unless non-space at end of line.
127 sel_buffer_lth = bp - sel_buffer;
131 struct speakup_paste_work {
132 struct work_struct work;
133 struct tty_struct *tty;
136 static void __speakup_paste_selection(struct work_struct *work)
138 struct speakup_paste_work *spw =
139 container_of(work, struct speakup_paste_work, work);
140 struct tty_struct *tty = xchg(&spw->tty, NULL);
141 struct vc_data *vc = (struct vc_data *)tty->driver_data;
142 int pasted = 0, count;
143 struct tty_ldisc *ld;
144 DECLARE_WAITQUEUE(wait, current);
146 ld = tty_ldisc_ref(tty);
149 tty_buffer_lock_exclusive(&vc->port);
151 add_wait_queue(&vc->paste_wait, &wait);
152 while (sel_buffer && sel_buffer_lth > pasted) {
153 set_current_state(TASK_INTERRUPTIBLE);
154 if (tty_throttled(tty)) {
158 count = sel_buffer_lth - pasted;
159 count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL,
163 remove_wait_queue(&vc->paste_wait, &wait);
164 __set_current_state(TASK_RUNNING);
166 tty_buffer_unlock_exclusive(&vc->port);
172 static struct speakup_paste_work speakup_paste_work = {
173 .work = __WORK_INITIALIZER(speakup_paste_work.work,
174 __speakup_paste_selection)
177 int speakup_paste_selection(struct tty_struct *tty)
179 if (cmpxchg(&speakup_paste_work.tty, NULL, tty))
183 schedule_work_on(WORK_CPU_UNBOUND, &speakup_paste_work.work);
187 void speakup_cancel_paste(void)
189 cancel_work_sync(&speakup_paste_work.work);
190 tty_kref_put(speakup_paste_work.tty);