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>
28 /* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
29 #define isspace(c) ((c) == ' ')
31 extern void poke_blanked_console(void);
33 /* Variables for selection control. */
34 /* Use a dynamic buffer, instead of static (Dec 1994) */
35 struct vc_data
*sel_cons
; /* must not be deallocated */
36 static int use_unicode
;
37 static volatile int sel_start
= -1; /* cleared by clear_selection */
39 static int sel_buffer_lth
;
40 static char *sel_buffer
;
42 /* clear_selection, highlight and highlight_pointer can be called
43 from interrupt (via scrollback/front) */
45 /* set reverse video on characters s-e of console with selection. */
46 static inline void highlight(const int s
, const int e
)
48 invert_screen(sel_cons
, s
, e
-s
+2, 1);
51 /* use complementary color to show the pointer */
52 static inline void highlight_pointer(const int where
)
54 complement_pos(sel_cons
, where
);
60 return inverse_translate(sel_cons
, screen_glyph(sel_cons
, n
),
64 /* remove the current selection highlight, if any,
65 from the console holding the selection. */
67 clear_selection(void) {
68 highlight_pointer(-1); /* hide the pointer */
69 if (sel_start
!= -1) {
70 highlight(sel_start
, sel_end
);
76 * User settable table: what characters are to be considered alphabetic?
79 static u32 inwordLut
[8]={
80 0x00000000, /* control chars */
81 0x03FF0000, /* digits */
82 0x87FFFFFE, /* uppercase and '_' */
83 0x07FFFFFE, /* lowercase */
86 0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */
87 0xFF7FFFFF /* latin-1 accented letters, not division sign */
90 static inline int inword(const u16 c
) {
91 return c
> 0xff || (( inwordLut
[c
>>5] >> (c
& 0x1F) ) & 1);
94 /* set inwordLut contents. Invoked by ioctl(). */
95 int sel_loadlut(char __user
*p
)
97 return copy_from_user(inwordLut
, (u32 __user
*)(p
+4), 32) ? -EFAULT
: 0;
100 /* does screen address p correspond to character at LH/RH edge of screen? */
101 static inline int atedge(const int p
, int size_row
)
103 return (!(p
% size_row
) || !((p
+ 2) % size_row
));
106 /* constrain v such that v <= u */
107 static inline unsigned short limit(const unsigned short v
, const unsigned short u
)
109 return (v
> u
) ? u
: v
;
112 /* stores the char in UTF8 and returns the number of bytes used (1-3) */
113 static int store_utf8(u16 c
, char *p
)
119 } else if (c
< 0x800) {
120 /* 110***** 10****** */
121 p
[0] = 0xc0 | (c
>> 6);
122 p
[1] = 0x80 | (c
& 0x3f);
125 /* 1110**** 10****** 10****** */
126 p
[0] = 0xe0 | (c
>> 12);
127 p
[1] = 0x80 | ((c
>> 6) & 0x3f);
128 p
[2] = 0x80 | (c
& 0x3f);
133 /* set the current selection. Invoked by ioctl() or by kernel code. */
134 int set_selection(const struct tiocl_selection __user
*sel
, struct tty_struct
*tty
)
136 struct vc_data
*vc
= vc_cons
[fg_console
].d
;
137 int sel_mode
, new_sel_start
, new_sel_end
, spc
;
139 int i
, ps
, pe
, multiplier
;
141 struct kbd_struct
*kbd
= kbd_table
+ fg_console
;
143 poke_blanked_console();
145 { unsigned short xs
, ys
, xe
, ye
;
147 if (!access_ok(VERIFY_READ
, sel
, sizeof(*sel
)))
149 __get_user(xs
, &sel
->xs
);
150 __get_user(ys
, &sel
->ys
);
151 __get_user(xe
, &sel
->xe
);
152 __get_user(ye
, &sel
->ye
);
153 __get_user(sel_mode
, &sel
->sel_mode
);
154 xs
--; ys
--; xe
--; ye
--;
155 xs
= limit(xs
, vc
->vc_cols
- 1);
156 ys
= limit(ys
, vc
->vc_rows
- 1);
157 xe
= limit(xe
, vc
->vc_cols
- 1);
158 ye
= limit(ye
, vc
->vc_rows
- 1);
159 ps
= ys
* vc
->vc_size_row
+ (xs
<< 1);
160 pe
= ye
* vc
->vc_size_row
+ (xe
<< 1);
162 if (sel_mode
== TIOCL_SELCLEAR
) {
163 /* useful for screendump without selection highlights */
168 if (mouse_reporting() && (sel_mode
& TIOCL_SELMOUSEREPORT
)) {
169 mouse_report(tty
, sel_mode
& TIOCL_SELBUTTONMASK
, xs
, ys
);
174 if (ps
> pe
) /* make sel_start <= sel_end */
181 if (sel_cons
!= vc_cons
[fg_console
].d
) {
183 sel_cons
= vc_cons
[fg_console
].d
;
185 use_unicode
= kbd
&& kbd
->kbdmode
== VC_UNICODE
;
189 case TIOCL_SELCHAR
: /* character-by-character selection */
193 case TIOCL_SELWORD
: /* word-by-word selection */
194 spc
= isspace(sel_pos(ps
));
195 for (new_sel_start
= ps
; ; ps
-= 2)
197 if ((spc
&& !isspace(sel_pos(ps
))) ||
198 (!spc
&& !inword(sel_pos(ps
))))
201 if (!(ps
% vc
->vc_size_row
))
204 spc
= isspace(sel_pos(pe
));
205 for (new_sel_end
= pe
; ; pe
+= 2)
207 if ((spc
&& !isspace(sel_pos(pe
))) ||
208 (!spc
&& !inword(sel_pos(pe
))))
211 if (!((pe
+ 2) % vc
->vc_size_row
))
215 case TIOCL_SELLINE
: /* line-by-line selection */
216 new_sel_start
= ps
- ps
% vc
->vc_size_row
;
217 new_sel_end
= pe
+ vc
->vc_size_row
218 - pe
% vc
->vc_size_row
- 2;
220 case TIOCL_SELPOINTER
:
221 highlight_pointer(pe
);
227 /* remove the pointer */
228 highlight_pointer(-1);
230 /* select to end of line if on trailing space */
231 if (new_sel_end
> new_sel_start
&&
232 !atedge(new_sel_end
, vc
->vc_size_row
) &&
233 isspace(sel_pos(new_sel_end
))) {
234 for (pe
= new_sel_end
+ 2; ; pe
+= 2)
235 if (!isspace(sel_pos(pe
)) ||
236 atedge(pe
, vc
->vc_size_row
))
238 if (isspace(sel_pos(pe
)))
241 if (sel_start
== -1) /* no current selection */
242 highlight(new_sel_start
, new_sel_end
);
243 else if (new_sel_start
== sel_start
)
245 if (new_sel_end
== sel_end
) /* no action required */
247 else if (new_sel_end
> sel_end
) /* extend to right */
248 highlight(sel_end
+ 2, new_sel_end
);
249 else /* contract from right */
250 highlight(new_sel_end
+ 2, sel_end
);
252 else if (new_sel_end
== sel_end
)
254 if (new_sel_start
< sel_start
) /* extend to left */
255 highlight(new_sel_start
, sel_start
- 2);
256 else /* contract from left */
257 highlight(sel_start
, new_sel_start
- 2);
259 else /* some other case; start selection from scratch */
262 highlight(new_sel_start
, new_sel_end
);
264 sel_start
= new_sel_start
;
265 sel_end
= new_sel_end
;
267 /* Allocate a new buffer before freeing the old one ... */
268 multiplier
= use_unicode
? 3 : 1; /* chars can take up to 3 bytes */
269 bp
= kmalloc(((sel_end
-sel_start
)/2+1)*multiplier
, GFP_KERNEL
);
271 printk(KERN_WARNING
"selection: kmalloc() failed\n");
279 for (i
= sel_start
; i
<= sel_end
; i
+= 2) {
282 bp
+= store_utf8(c
, bp
);
287 if (! ((i
+ 2) % vc
->vc_size_row
)) {
288 /* strip trailing blanks from line and add newline,
289 unless non-space at end of line. */
297 sel_buffer_lth
= bp
- sel_buffer
;
301 /* Insert the contents of the selection buffer into the
302 * queue of the tty associated with the current console.
303 * Invoked by ioctl().
305 int paste_selection(struct tty_struct
*tty
)
307 struct vc_data
*vc
= tty
->driver_data
;
310 struct tty_ldisc
*ld
;
311 DECLARE_WAITQUEUE(wait
, current
);
313 /* always called with BTM from vt_ioctl */
314 WARN_ON(!tty_locked());
317 poke_blanked_console();
320 ld
= tty_ldisc_ref(tty
);
323 ld
= tty_ldisc_ref_wait(tty
);
327 add_wait_queue(&vc
->paste_wait
, &wait
);
328 while (sel_buffer
&& sel_buffer_lth
> pasted
) {
329 set_current_state(TASK_INTERRUPTIBLE
);
330 if (test_bit(TTY_THROTTLED
, &tty
->flags
)) {
334 count
= sel_buffer_lth
- pasted
;
335 count
= tty
->ldisc
->ops
->receive_buf(tty
, sel_buffer
+ pasted
,
339 remove_wait_queue(&vc
->paste_wait
, &wait
);
340 __set_current_state(TASK_RUNNING
);