linux/drivers/tty/vt/selection.c
Adam Borowski 9bfdc2611d vt: selection: take screen contents from uniscr if available
This preserves whatever was written even if we can't currently display the
given glyph.  Mouse paste won't corrupt any character of wcwidth() == 1
anymore.

Note that for now uniscr doesn't get allocated until something reads
/dev/vcsuN for that console, making this code dormant for most users.

Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-07-21 09:18:27 +02:00

370 lines
9.3 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* This module exports the functions:
*
* 'int set_selection(struct tiocl_selection __user *, struct tty_struct *)'
* 'void clear_selection(void)'
* 'int paste_selection(struct tty_struct *)'
* 'int sel_loadlut(char __user *)'
*
* Now that /dev/vcs exists, most of this can disappear again.
*/
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/kbd_kern.h>
#include <linux/vt_kern.h>
#include <linux/consolemap.h>
#include <linux/selection.h>
#include <linux/tiocl.h>
#include <linux/console.h>
#include <linux/tty_flip.h>
/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
#define isspace(c) ((c) == ' ')
extern void poke_blanked_console(void);
/* FIXME: all this needs locking */
/* Variables for selection control. */
/* Use a dynamic buffer, instead of static (Dec 1994) */
struct vc_data *sel_cons; /* must not be deallocated */
static int use_unicode;
static volatile int sel_start = -1; /* cleared by clear_selection */
static int sel_end;
static int sel_buffer_lth;
static char *sel_buffer;
/* clear_selection, highlight and highlight_pointer can be called
from interrupt (via scrollback/front) */
/* set reverse video on characters s-e of console with selection. */
static inline void highlight(const int s, const int e)
{
invert_screen(sel_cons, s, e-s+2, 1);
}
/* use complementary color to show the pointer */
static inline void highlight_pointer(const int where)
{
complement_pos(sel_cons, where);
}
static u32
sel_pos(int n)
{
if (use_unicode)
return screen_glyph_unicode(sel_cons, n / 2);
return inverse_translate(sel_cons, screen_glyph(sel_cons, n),
0);
}
/**
* clear_selection - remove current selection
*
* Remove the current selection highlight, if any from the console
* holding the selection. The caller must hold the console lock.
*/
void clear_selection(void)
{
highlight_pointer(-1); /* hide the pointer */
if (sel_start != -1) {
highlight(sel_start, sel_end);
sel_start = -1;
}
}
/*
* User settable table: what characters are to be considered alphabetic?
* 128 bits. Locked by the console lock.
*/
static u32 inwordLut[]={
0x00000000, /* control chars */
0x03FFE000, /* digits and "-./" */
0x87FFFFFE, /* uppercase and '_' */
0x07FFFFFE, /* lowercase */
};
static inline int inword(const u32 c)
{
return c > 0x7f || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
}
/**
* set loadlut - load the LUT table
* @p: user table
*
* Load the LUT table from user space. The caller must hold the console
* lock. Make a temporary copy so a partial update doesn't make a mess.
*/
int sel_loadlut(char __user *p)
{
u32 tmplut[ARRAY_SIZE(inwordLut)];
if (copy_from_user(tmplut, (u32 __user *)(p+4), sizeof(inwordLut)))
return -EFAULT;
memcpy(inwordLut, tmplut, sizeof(inwordLut));
return 0;
}
/* does screen address p correspond to character at LH/RH edge of screen? */
static inline int atedge(const int p, int size_row)
{
return (!(p % size_row) || !((p + 2) % size_row));
}
/* stores the char in UTF8 and returns the number of bytes used (1-4) */
static int store_utf8(u32 c, char *p)
{
if (c < 0x80) {
/* 0******* */
p[0] = c;
return 1;
} else if (c < 0x800) {
/* 110***** 10****** */
p[0] = 0xc0 | (c >> 6);
p[1] = 0x80 | (c & 0x3f);
return 2;
} else if (c < 0x10000) {
/* 1110**** 10****** 10****** */
p[0] = 0xe0 | (c >> 12);
p[1] = 0x80 | ((c >> 6) & 0x3f);
p[2] = 0x80 | (c & 0x3f);
return 3;
} else if (c < 0x110000) {
/* 11110*** 10****** 10****** 10****** */
p[0] = 0xf0 | (c >> 18);
p[1] = 0x80 | ((c >> 12) & 0x3f);
p[2] = 0x80 | ((c >> 6) & 0x3f);
p[3] = 0x80 | (c & 0x3f);
return 4;
} else {
/* outside Unicode, replace with U+FFFD */
p[0] = 0xef;
p[1] = 0xbf;
p[2] = 0xbd;
return 3;
}
}
/**
* set_selection - set the current selection.
* @sel: user selection info
* @tty: the console tty
*
* Invoked by the ioctl handle for the vt layer.
*
* The entire selection process is managed under the console_lock. It's
* a lot under the lock but its hardly a performance path
*/
int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty)
{
struct vc_data *vc = vc_cons[fg_console].d;
int new_sel_start, new_sel_end, spc;
struct tiocl_selection v;
char *bp, *obp;
int i, ps, pe, multiplier;
u32 c;
int mode;
poke_blanked_console();
if (copy_from_user(&v, sel, sizeof(*sel)))
return -EFAULT;
v.xs = min_t(u16, v.xs - 1, vc->vc_cols - 1);
v.ys = min_t(u16, v.ys - 1, vc->vc_rows - 1);
v.xe = min_t(u16, v.xe - 1, vc->vc_cols - 1);
v.ye = min_t(u16, v.ye - 1, vc->vc_rows - 1);
ps = v.ys * vc->vc_size_row + (v.xs << 1);
pe = v.ye * vc->vc_size_row + (v.xe << 1);
if (v.sel_mode == TIOCL_SELCLEAR) {
/* useful for screendump without selection highlights */
clear_selection();
return 0;
}
if (mouse_reporting() && (v.sel_mode & TIOCL_SELMOUSEREPORT)) {
mouse_report(tty, v.sel_mode & TIOCL_SELBUTTONMASK, v.xs, v.ys);
return 0;
}
if (ps > pe) /* make sel_start <= sel_end */
swap(ps, pe);
if (sel_cons != vc_cons[fg_console].d) {
clear_selection();
sel_cons = vc_cons[fg_console].d;
}
mode = vt_do_kdgkbmode(fg_console);
if (mode == K_UNICODE)
use_unicode = 1;
else
use_unicode = 0;
switch (v.sel_mode)
{
case TIOCL_SELCHAR: /* character-by-character selection */
new_sel_start = ps;
new_sel_end = pe;
break;
case TIOCL_SELWORD: /* word-by-word selection */
spc = isspace(sel_pos(ps));
for (new_sel_start = ps; ; ps -= 2)
{
if ((spc && !isspace(sel_pos(ps))) ||
(!spc && !inword(sel_pos(ps))))
break;
new_sel_start = ps;
if (!(ps % vc->vc_size_row))
break;
}
spc = isspace(sel_pos(pe));
for (new_sel_end = pe; ; pe += 2)
{
if ((spc && !isspace(sel_pos(pe))) ||
(!spc && !inword(sel_pos(pe))))
break;
new_sel_end = pe;
if (!((pe + 2) % vc->vc_size_row))
break;
}
break;
case TIOCL_SELLINE: /* line-by-line selection */
new_sel_start = ps - ps % vc->vc_size_row;
new_sel_end = pe + vc->vc_size_row
- pe % vc->vc_size_row - 2;
break;
case TIOCL_SELPOINTER:
highlight_pointer(pe);
return 0;
default:
return -EINVAL;
}
/* remove the pointer */
highlight_pointer(-1);
/* select to end of line if on trailing space */
if (new_sel_end > new_sel_start &&
!atedge(new_sel_end, vc->vc_size_row) &&
isspace(sel_pos(new_sel_end))) {
for (pe = new_sel_end + 2; ; pe += 2)
if (!isspace(sel_pos(pe)) ||
atedge(pe, vc->vc_size_row))
break;
if (isspace(sel_pos(pe)))
new_sel_end = pe;
}
if (sel_start == -1) /* no current selection */
highlight(new_sel_start, new_sel_end);
else if (new_sel_start == sel_start)
{
if (new_sel_end == sel_end) /* no action required */
return 0;
else if (new_sel_end > sel_end) /* extend to right */
highlight(sel_end + 2, new_sel_end);
else /* contract from right */
highlight(new_sel_end + 2, sel_end);
}
else if (new_sel_end == sel_end)
{
if (new_sel_start < sel_start) /* extend to left */
highlight(new_sel_start, sel_start - 2);
else /* contract from left */
highlight(sel_start, new_sel_start - 2);
}
else /* some other case; start selection from scratch */
{
clear_selection();
highlight(new_sel_start, new_sel_end);
}
sel_start = new_sel_start;
sel_end = new_sel_end;
/* Allocate a new buffer before freeing the old one ... */
multiplier = use_unicode ? 4 : 1; /* chars can take up to 4 bytes */
bp = kmalloc_array((sel_end - sel_start) / 2 + 1, multiplier,
GFP_KERNEL);
if (!bp) {
printk(KERN_WARNING "selection: kmalloc() failed\n");
clear_selection();
return -ENOMEM;
}
kfree(sel_buffer);
sel_buffer = bp;
obp = bp;
for (i = sel_start; i <= sel_end; i += 2) {
c = sel_pos(i);
if (use_unicode)
bp += store_utf8(c, bp);
else
*bp++ = c;
if (!isspace(c))
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;
}
/* Insert the contents of the selection buffer into the
* queue of the tty associated with the current console.
* Invoked by ioctl().
*
* Locking: called without locks. Calls the ldisc wrongly with
* unsafe methods,
*/
int paste_selection(struct tty_struct *tty)
{
struct vc_data *vc = tty->driver_data;
int pasted = 0;
unsigned int count;
struct tty_ldisc *ld;
DECLARE_WAITQUEUE(wait, current);
console_lock();
poke_blanked_console();
console_unlock();
ld = tty_ldisc_ref_wait(tty);
if (!ld)
return -EIO; /* ldisc was hung up */
tty_buffer_lock_exclusive(&vc->port);
add_wait_queue(&vc->paste_wait, &wait);
while (sel_buffer && sel_buffer_lth > pasted) {
set_current_state(TASK_INTERRUPTIBLE);
if (tty_throttled(tty)) {
schedule();
continue;
}
__set_current_state(TASK_RUNNING);
count = sel_buffer_lth - pasted;
count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL,
count);
pasted += count;
}
remove_wait_queue(&vc->paste_wait, &wait);
__set_current_state(TASK_RUNNING);
tty_buffer_unlock_exclusive(&vc->port);
tty_ldisc_deref(ld);
return 0;
}