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#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;
dev_warn(tty->dev,
"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) {
dev_warn(tty->dev, "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,
NULL, count);
pasted += count;
}
remove_wait_queue(&vc->paste_wait, &wait);
current->state = TASK_RUNNING;
return 0;
}
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