Contributors: 22
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jiri Slaby |
924 |
46.81% |
13 |
20.00% |
| Linus Torvalds (pre-git) |
568 |
28.77% |
13 |
20.00% |
| Adam Borowski |
141 |
7.14% |
5 |
7.69% |
| Jan Engelhardt |
129 |
6.53% |
1 |
1.54% |
| Okash Khawaja |
61 |
3.09% |
1 |
1.54% |
| Alan Cox |
43 |
2.18% |
6 |
9.23% |
| Peter Hurley |
36 |
1.82% |
5 |
7.69% |
| Andrew Morton |
14 |
0.71% |
2 |
3.08% |
| Christoph Hellwig |
13 |
0.66% |
1 |
1.54% |
| Andy Shevchenko |
9 |
0.46% |
1 |
1.54% |
| Al Viro |
7 |
0.35% |
1 |
1.54% |
| Roman Zippel |
6 |
0.30% |
2 |
3.08% |
| Linus Torvalds |
5 |
0.25% |
4 |
6.15% |
| Greg Kroah-Hartman |
4 |
0.20% |
2 |
3.08% |
| Milind Arun Choudhary |
3 |
0.15% |
1 |
1.54% |
| Alexey Kardashevskiy |
2 |
0.10% |
1 |
1.54% |
| Arnd Bergmann |
2 |
0.10% |
1 |
1.54% |
| Gustavo A. R. Silva |
2 |
0.10% |
1 |
1.54% |
| Torben Hohn |
2 |
0.10% |
1 |
1.54% |
| Lee Jones |
1 |
0.05% |
1 |
1.54% |
| Mika Kukkonen |
1 |
0.05% |
1 |
1.54% |
| Kees Cook |
1 |
0.05% |
1 |
1.54% |
| Total |
1974 |
|
65 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* This module exports the functions:
*
* 'int set_selection_user(struct tiocl_selection __user *,
* struct tty_struct *)'
* 'int set_selection_kernel(struct tiocl_selection *, 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/mutex.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>
#include <linux/sched/signal.h>
/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
#define is_space_on_vt(c) ((c) == ' ')
/* FIXME: all this needs locking */
static struct vc_selection {
struct mutex lock;
struct vc_data *cons; /* must not be deallocated */
char *buffer;
unsigned int buf_len;
volatile int start; /* cleared by clear_selection */
int end;
} vc_sel = {
.lock = __MUTEX_INITIALIZER(vc_sel.lock),
.start = -1,
};
/* 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(vc_sel.cons, s, e-s+2, true);
}
/* use complementary color to show the pointer */
static inline void highlight_pointer(const int where)
{
complement_pos(vc_sel.cons, where);
}
static u32
sel_pos(int n, bool unicode)
{
if (unicode)
return screen_glyph_unicode(vc_sel.cons, n / 2);
return inverse_translate(vc_sel.cons, screen_glyph(vc_sel.cons, n),
false);
}
/**
* 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 (vc_sel.start != -1) {
highlight(vc_sel.start, vc_sel.end);
vc_sel.start = -1;
}
}
EXPORT_SYMBOL_GPL(clear_selection);
bool vc_is_sel(struct vc_data *vc)
{
return vc == vc_sel.cons;
}
/*
* 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);
}
/**
* sel_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_user - 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_user(const struct tiocl_selection __user *sel,
struct tty_struct *tty)
{
struct tiocl_selection v;
if (copy_from_user(&v, sel, sizeof(*sel)))
return -EFAULT;
return set_selection_kernel(&v, tty);
}
static int vc_selection_store_chars(struct vc_data *vc, bool unicode)
{
char *bp, *obp;
unsigned int i;
/* Allocate a new buffer before freeing the old one ... */
/* chars can take up to 4 bytes with unicode */
bp = kmalloc_array((vc_sel.end - vc_sel.start) / 2 + 1, unicode ? 4 : 1,
GFP_KERNEL | __GFP_NOWARN);
if (!bp) {
printk(KERN_WARNING "selection: kmalloc() failed\n");
clear_selection();
return -ENOMEM;
}
kfree(vc_sel.buffer);
vc_sel.buffer = bp;
obp = bp;
for (i = vc_sel.start; i <= vc_sel.end; i += 2) {
u32 c = sel_pos(i, unicode);
if (unicode)
bp += store_utf8(c, bp);
else
*bp++ = c;
if (!is_space_on_vt(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;
}
}
vc_sel.buf_len = bp - vc_sel.buffer;
return 0;
}
static int vc_do_selection(struct vc_data *vc, unsigned short mode, int ps,
int pe)
{
int new_sel_start, new_sel_end, spc;
bool unicode = vt_do_kdgkbmode(fg_console) == K_UNICODE;
switch (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 = is_space_on_vt(sel_pos(ps, unicode));
for (new_sel_start = ps; ; ps -= 2) {
if ((spc && !is_space_on_vt(sel_pos(ps, unicode))) ||
(!spc && !inword(sel_pos(ps, unicode))))
break;
new_sel_start = ps;
if (!(ps % vc->vc_size_row))
break;
}
spc = is_space_on_vt(sel_pos(pe, unicode));
for (new_sel_end = pe; ; pe += 2) {
if ((spc && !is_space_on_vt(sel_pos(pe, unicode))) ||
(!spc && !inword(sel_pos(pe, unicode))))
break;
new_sel_end = pe;
if (!((pe + 2) % vc->vc_size_row))
break;
}
break;
case TIOCL_SELLINE: /* line-by-line selection */
new_sel_start = rounddown(ps, vc->vc_size_row);
new_sel_end = rounddown(pe, vc->vc_size_row) +
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) &&
is_space_on_vt(sel_pos(new_sel_end, unicode))) {
for (pe = new_sel_end + 2; ; pe += 2)
if (!is_space_on_vt(sel_pos(pe, unicode)) ||
atedge(pe, vc->vc_size_row))
break;
if (is_space_on_vt(sel_pos(pe, unicode)))
new_sel_end = pe;
}
if (vc_sel.start == -1) /* no current selection */
highlight(new_sel_start, new_sel_end);
else if (new_sel_start == vc_sel.start)
{
if (new_sel_end == vc_sel.end) /* no action required */
return 0;
else if (new_sel_end > vc_sel.end) /* extend to right */
highlight(vc_sel.end + 2, new_sel_end);
else /* contract from right */
highlight(new_sel_end + 2, vc_sel.end);
}
else if (new_sel_end == vc_sel.end)
{
if (new_sel_start < vc_sel.start) /* extend to left */
highlight(new_sel_start, vc_sel.start - 2);
else /* contract from left */
highlight(vc_sel.start, new_sel_start - 2);
}
else /* some other case; start selection from scratch */
{
clear_selection();
highlight(new_sel_start, new_sel_end);
}
vc_sel.start = new_sel_start;
vc_sel.end = new_sel_end;
return vc_selection_store_chars(vc, unicode);
}
static int vc_selection(struct vc_data *vc, struct tiocl_selection *v,
struct tty_struct *tty)
{
int ps, pe;
poke_blanked_console();
if (v->sel_mode == TIOCL_SELCLEAR) {
/* useful for screendump without selection highlights */
clear_selection();
return 0;
}
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);
if (mouse_reporting() && (v->sel_mode & TIOCL_SELMOUSEREPORT)) {
mouse_report(tty, v->sel_mode & TIOCL_SELBUTTONMASK, v->xs,
v->ys);
return 0;
}
ps = v->ys * vc->vc_size_row + (v->xs << 1);
pe = v->ye * vc->vc_size_row + (v->xe << 1);
if (ps > pe) /* make vc_sel.start <= vc_sel.end */
swap(ps, pe);
if (vc_sel.cons != vc) {
clear_selection();
vc_sel.cons = vc;
}
return vc_do_selection(vc, v->sel_mode, ps, pe);
}
int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty)
{
int ret;
mutex_lock(&vc_sel.lock);
console_lock();
ret = vc_selection(vc_cons[fg_console].d, v, tty);
console_unlock();
mutex_unlock(&vc_sel.lock);
return ret;
}
EXPORT_SYMBOL_GPL(set_selection_kernel);
/* 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);
int ret = 0;
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);
mutex_lock(&vc_sel.lock);
while (vc_sel.buffer && vc_sel.buf_len > pasted) {
set_current_state(TASK_INTERRUPTIBLE);
if (signal_pending(current)) {
ret = -EINTR;
break;
}
if (tty_throttled(tty)) {
mutex_unlock(&vc_sel.lock);
schedule();
mutex_lock(&vc_sel.lock);
continue;
}
__set_current_state(TASK_RUNNING);
count = vc_sel.buf_len - pasted;
count = tty_ldisc_receive_buf(ld, vc_sel.buffer + pasted, NULL,
count);
pasted += count;
}
mutex_unlock(&vc_sel.lock);
remove_wait_queue(&vc->paste_wait, &wait);
__set_current_state(TASK_RUNNING);
tty_buffer_unlock_exclusive(&vc->port);
tty_ldisc_deref(ld);
return ret;
}
EXPORT_SYMBOL_GPL(paste_selection);