]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - drivers/tty/vt/selection.c
2 * This module exports the functions:
4 * 'int set_selection(struct tiocl_selection __user *, struct tty_struct *)'
5 * 'void clear_selection(void)'
6 * 'int paste_selection(struct tty_struct *)'
7 * 'int sel_loadlut(char __user *)'
9 * Now that /dev/vcs exists, most of this can disappear again.
12 #include <linux/module.h>
13 #include <linux/tty.h>
14 #include <linux/sched.h>
16 #include <linux/slab.h>
17 #include <linux/types.h>
19 #include <asm/uaccess.h>
21 #include <linux/kbd_kern.h>
22 #include <linux/vt_kern.h>
23 #include <linux/consolemap.h>
24 #include <linux/selection.h>
25 #include <linux/tiocl.h>
26 #include <linux/console.h>
27 #include <linux/tty_flip.h>
29 /* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
30 #define isspace(c) ((c) == ' ')
32 extern void poke_blanked_console(void);
34 /* FIXME: all this needs locking */
35 /* Variables for selection control. */
36 /* Use a dynamic buffer, instead of static (Dec 1994) */
37 struct vc_data
*sel_cons
; /* must not be deallocated */
38 static int use_unicode
;
39 static volatile int sel_start
= -1; /* cleared by clear_selection */
41 static int sel_buffer_lth
;
42 static char *sel_buffer
;
44 /* clear_selection, highlight and highlight_pointer can be called
45 from interrupt (via scrollback/front) */
47 /* set reverse video on characters s-e of console with selection. */
48 static inline void highlight(const int s
, const int e
)
50 invert_screen(sel_cons
, s
, e
-s
+2, 1);
53 /* use complementary color to show the pointer */
54 static inline void highlight_pointer(const int where
)
56 complement_pos(sel_cons
, where
);
62 return inverse_translate(sel_cons
, screen_glyph(sel_cons
, n
),
67 * clear_selection - remove current selection
69 * Remove the current selection highlight, if any from the console
70 * holding the selection. The caller must hold the console lock.
72 void clear_selection(void)
74 highlight_pointer(-1); /* hide the pointer */
75 if (sel_start
!= -1) {
76 highlight(sel_start
, sel_end
);
82 * User settable table: what characters are to be considered alphabetic?
83 * 256 bits. Locked by the console lock.
85 static u32 inwordLut
[8]={
86 0x00000000, /* control chars */
87 0x03FF0000, /* digits */
88 0x87FFFFFE, /* uppercase and '_' */
89 0x07FFFFFE, /* lowercase */
92 0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */
93 0xFF7FFFFF /* latin-1 accented letters, not division sign */
96 static inline int inword(const u16 c
) {
97 return c
> 0xff || (( inwordLut
[c
>>5] >> (c
& 0x1F) ) & 1);
101 * set loadlut - load the LUT table
104 * Load the LUT table from user space. The caller must hold the console
105 * lock. Make a temporary copy so a partial update doesn't make a mess.
107 int sel_loadlut(char __user
*p
)
110 if (copy_from_user(tmplut
, (u32 __user
*)(p
+4), 32))
112 memcpy(inwordLut
, tmplut
, 32);
116 /* does screen address p correspond to character at LH/RH edge of screen? */
117 static inline int atedge(const int p
, int size_row
)
119 return (!(p
% size_row
) || !((p
+ 2) % size_row
));
122 /* constrain v such that v <= u */
123 static inline unsigned short limit(const unsigned short v
, const unsigned short u
)
125 return (v
> u
) ? u
: v
;
128 /* stores the char in UTF8 and returns the number of bytes used (1-3) */
129 static int store_utf8(u16 c
, char *p
)
135 } else if (c
< 0x800) {
136 /* 110***** 10****** */
137 p
[0] = 0xc0 | (c
>> 6);
138 p
[1] = 0x80 | (c
& 0x3f);
141 /* 1110**** 10****** 10****** */
142 p
[0] = 0xe0 | (c
>> 12);
143 p
[1] = 0x80 | ((c
>> 6) & 0x3f);
144 p
[2] = 0x80 | (c
& 0x3f);
150 * set_selection - set the current selection.
151 * @sel: user selection info
152 * @tty: the console tty
154 * Invoked by the ioctl handle for the vt layer.
156 * The entire selection process is managed under the console_lock. It's
157 * a lot under the lock but its hardly a performance path
159 int set_selection(const struct tiocl_selection __user
*sel
, struct tty_struct
*tty
)
161 struct vc_data
*vc
= vc_cons
[fg_console
].d
;
162 int sel_mode
, new_sel_start
, new_sel_end
, spc
;
164 int i
, ps
, pe
, multiplier
;
168 poke_blanked_console();
170 { unsigned short xs
, ys
, xe
, ye
;
172 if (!access_ok(VERIFY_READ
, sel
, sizeof(*sel
)))
174 __get_user(xs
, &sel
->xs
);
175 __get_user(ys
, &sel
->ys
);
176 __get_user(xe
, &sel
->xe
);
177 __get_user(ye
, &sel
->ye
);
178 __get_user(sel_mode
, &sel
->sel_mode
);
179 xs
--; ys
--; xe
--; ye
--;
180 xs
= limit(xs
, vc
->vc_cols
- 1);
181 ys
= limit(ys
, vc
->vc_rows
- 1);
182 xe
= limit(xe
, vc
->vc_cols
- 1);
183 ye
= limit(ye
, vc
->vc_rows
- 1);
184 ps
= ys
* vc
->vc_size_row
+ (xs
<< 1);
185 pe
= ye
* vc
->vc_size_row
+ (xe
<< 1);
187 if (sel_mode
== TIOCL_SELCLEAR
) {
188 /* useful for screendump without selection highlights */
193 if (mouse_reporting() && (sel_mode
& TIOCL_SELMOUSEREPORT
)) {
194 mouse_report(tty
, sel_mode
& TIOCL_SELBUTTONMASK
, xs
, ys
);
199 if (ps
> pe
) /* make sel_start <= sel_end */
206 if (sel_cons
!= vc_cons
[fg_console
].d
) {
208 sel_cons
= vc_cons
[fg_console
].d
;
210 mode
= vt_do_kdgkbmode(fg_console
);
211 if (mode
== K_UNICODE
)
218 case TIOCL_SELCHAR
: /* character-by-character selection */
222 case TIOCL_SELWORD
: /* word-by-word selection */
223 spc
= isspace(sel_pos(ps
));
224 for (new_sel_start
= ps
; ; ps
-= 2)
226 if ((spc
&& !isspace(sel_pos(ps
))) ||
227 (!spc
&& !inword(sel_pos(ps
))))
230 if (!(ps
% vc
->vc_size_row
))
233 spc
= isspace(sel_pos(pe
));
234 for (new_sel_end
= pe
; ; pe
+= 2)
236 if ((spc
&& !isspace(sel_pos(pe
))) ||
237 (!spc
&& !inword(sel_pos(pe
))))
240 if (!((pe
+ 2) % vc
->vc_size_row
))
244 case TIOCL_SELLINE
: /* line-by-line selection */
245 new_sel_start
= ps
- ps
% vc
->vc_size_row
;
246 new_sel_end
= pe
+ vc
->vc_size_row
247 - pe
% vc
->vc_size_row
- 2;
249 case TIOCL_SELPOINTER
:
250 highlight_pointer(pe
);
256 /* remove the pointer */
257 highlight_pointer(-1);
259 /* select to end of line if on trailing space */
260 if (new_sel_end
> new_sel_start
&&
261 !atedge(new_sel_end
, vc
->vc_size_row
) &&
262 isspace(sel_pos(new_sel_end
))) {
263 for (pe
= new_sel_end
+ 2; ; pe
+= 2)
264 if (!isspace(sel_pos(pe
)) ||
265 atedge(pe
, vc
->vc_size_row
))
267 if (isspace(sel_pos(pe
)))
270 if (sel_start
== -1) /* no current selection */
271 highlight(new_sel_start
, new_sel_end
);
272 else if (new_sel_start
== sel_start
)
274 if (new_sel_end
== sel_end
) /* no action required */
276 else if (new_sel_end
> sel_end
) /* extend to right */
277 highlight(sel_end
+ 2, new_sel_end
);
278 else /* contract from right */
279 highlight(new_sel_end
+ 2, sel_end
);
281 else if (new_sel_end
== sel_end
)
283 if (new_sel_start
< sel_start
) /* extend to left */
284 highlight(new_sel_start
, sel_start
- 2);
285 else /* contract from left */
286 highlight(sel_start
, new_sel_start
- 2);
288 else /* some other case; start selection from scratch */
291 highlight(new_sel_start
, new_sel_end
);
293 sel_start
= new_sel_start
;
294 sel_end
= new_sel_end
;
296 /* Allocate a new buffer before freeing the old one ... */
297 multiplier
= use_unicode
? 3 : 1; /* chars can take up to 3 bytes */
298 bp
= kmalloc(((sel_end
-sel_start
)/2+1)*multiplier
, GFP_KERNEL
);
300 printk(KERN_WARNING
"selection: kmalloc() failed\n");
308 for (i
= sel_start
; i
<= sel_end
; i
+= 2) {
311 bp
+= store_utf8(c
, bp
);
316 if (! ((i
+ 2) % vc
->vc_size_row
)) {
317 /* strip trailing blanks from line and add newline,
318 unless non-space at end of line. */
326 sel_buffer_lth
= bp
- sel_buffer
;
330 /* Insert the contents of the selection buffer into the
331 * queue of the tty associated with the current console.
332 * Invoked by ioctl().
334 * Locking: called without locks. Calls the ldisc wrongly with
337 int paste_selection(struct tty_struct
*tty
)
339 struct vc_data
*vc
= tty
->driver_data
;
342 struct tty_ldisc
*ld
;
343 DECLARE_WAITQUEUE(wait
, current
);
346 poke_blanked_console();
349 ld
= tty_ldisc_ref_wait(tty
);
350 tty_buffer_lock_exclusive(&vc
->port
);
352 add_wait_queue(&vc
->paste_wait
, &wait
);
353 while (sel_buffer
&& sel_buffer_lth
> pasted
) {
354 set_current_state(TASK_INTERRUPTIBLE
);
355 if (test_bit(TTY_THROTTLED
, &tty
->flags
)) {
359 count
= sel_buffer_lth
- pasted
;
360 count
= tty_ldisc_receive_buf(ld
, sel_buffer
+ pasted
, NULL
,
364 remove_wait_queue(&vc
->paste_wait
, &wait
);
365 __set_current_state(TASK_RUNNING
);
367 tty_buffer_unlock_exclusive(&vc
->port
);