2 * linux/drivers/char/selection.c
4 * This module exports the functions:
6 * 'int set_selection(struct tiocl_selection __user *, struct tty_struct *)'
7 * 'void clear_selection(void)'
8 * 'int paste_selection(struct tty_struct *)'
9 * 'int sel_loadlut(char __user *)'
11 * Now that /dev/vcs exists, most of this can disappear again.
14 #include <linux/module.h>
15 #include <linux/tty.h>
16 #include <linux/sched.h>
18 #include <linux/slab.h>
19 #include <linux/types.h>
21 #include <asm/uaccess.h>
23 #include <linux/kbd_kern.h>
24 #include <linux/vt_kern.h>
25 #include <linux/consolemap.h>
26 #include <linux/selection.h>
27 #include <linux/tiocl.h>
28 #include <linux/console.h>
30 /* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
31 #define isspace(c) ((c) == ' ')
33 extern void poke_blanked_console(void);
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
),
66 /* remove the current selection highlight, if any,
67 from the console holding the selection. */
69 clear_selection(void) {
70 highlight_pointer(-1); /* hide the pointer */
71 if (sel_start
!= -1) {
72 highlight(sel_start
, sel_end
);
78 * User settable table: what characters are to be considered alphabetic?
81 static u32 inwordLut
[8]={
82 0x00000000, /* control chars */
83 0x03FF0000, /* digits */
84 0x87FFFFFE, /* uppercase and '_' */
85 0x07FFFFFE, /* lowercase */
88 0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */
89 0xFF7FFFFF /* latin-1 accented letters, not division sign */
92 static inline int inword(const u16 c
) {
93 return c
> 0xff || (( inwordLut
[c
>>5] >> (c
& 0x1F) ) & 1);
96 /* set inwordLut contents. Invoked by ioctl(). */
97 int sel_loadlut(char __user
*p
)
99 return copy_from_user(inwordLut
, (u32 __user
*)(p
+4), 32) ? -EFAULT
: 0;
102 /* does screen address p correspond to character at LH/RH edge of screen? */
103 static inline int atedge(const int p
, int size_row
)
105 return (!(p
% size_row
) || !((p
+ 2) % size_row
));
108 /* constrain v such that v <= u */
109 static inline unsigned short limit(const unsigned short v
, const unsigned short u
)
111 return (v
> u
) ? u
: v
;
114 /* stores the char in UTF8 and returns the number of bytes used (1-3) */
115 static int store_utf8(u16 c
, char *p
)
121 } else if (c
< 0x800) {
122 /* 110***** 10****** */
123 p
[0] = 0xc0 | (c
>> 6);
124 p
[1] = 0x80 | (c
& 0x3f);
127 /* 1110**** 10****** 10****** */
128 p
[0] = 0xe0 | (c
>> 12);
129 p
[1] = 0x80 | ((c
>> 6) & 0x3f);
130 p
[2] = 0x80 | (c
& 0x3f);
135 /* set the current selection. Invoked by ioctl() or by kernel code. */
136 int set_selection(const struct tiocl_selection __user
*sel
, struct tty_struct
*tty
)
138 struct vc_data
*vc
= vc_cons
[fg_console
].d
;
139 int sel_mode
, new_sel_start
, new_sel_end
, spc
;
141 int i
, ps
, pe
, multiplier
;
143 struct kbd_struct
*kbd
= kbd_table
+ fg_console
;
145 poke_blanked_console();
147 { unsigned short xs
, ys
, xe
, ye
;
149 if (!access_ok(VERIFY_READ
, sel
, sizeof(*sel
)))
151 __get_user(xs
, &sel
->xs
);
152 __get_user(ys
, &sel
->ys
);
153 __get_user(xe
, &sel
->xe
);
154 __get_user(ye
, &sel
->ye
);
155 __get_user(sel_mode
, &sel
->sel_mode
);
156 xs
--; ys
--; xe
--; ye
--;
157 xs
= limit(xs
, vc
->vc_cols
- 1);
158 ys
= limit(ys
, vc
->vc_rows
- 1);
159 xe
= limit(xe
, vc
->vc_cols
- 1);
160 ye
= limit(ye
, vc
->vc_rows
- 1);
161 ps
= ys
* vc
->vc_size_row
+ (xs
<< 1);
162 pe
= ye
* vc
->vc_size_row
+ (xe
<< 1);
164 if (sel_mode
== TIOCL_SELCLEAR
) {
165 /* useful for screendump without selection highlights */
170 if (mouse_reporting() && (sel_mode
& TIOCL_SELMOUSEREPORT
)) {
171 mouse_report(tty
, sel_mode
& TIOCL_SELBUTTONMASK
, xs
, ys
);
176 if (ps
> pe
) /* make sel_start <= sel_end */
183 if (sel_cons
!= vc_cons
[fg_console
].d
) {
185 sel_cons
= vc_cons
[fg_console
].d
;
187 use_unicode
= kbd
&& kbd
->kbdmode
== VC_UNICODE
;
191 case TIOCL_SELCHAR
: /* character-by-character selection */
195 case TIOCL_SELWORD
: /* word-by-word selection */
196 spc
= isspace(sel_pos(ps
));
197 for (new_sel_start
= ps
; ; ps
-= 2)
199 if ((spc
&& !isspace(sel_pos(ps
))) ||
200 (!spc
&& !inword(sel_pos(ps
))))
203 if (!(ps
% vc
->vc_size_row
))
206 spc
= isspace(sel_pos(pe
));
207 for (new_sel_end
= pe
; ; pe
+= 2)
209 if ((spc
&& !isspace(sel_pos(pe
))) ||
210 (!spc
&& !inword(sel_pos(pe
))))
213 if (!((pe
+ 2) % vc
->vc_size_row
))
217 case TIOCL_SELLINE
: /* line-by-line selection */
218 new_sel_start
= ps
- ps
% vc
->vc_size_row
;
219 new_sel_end
= pe
+ vc
->vc_size_row
220 - pe
% vc
->vc_size_row
- 2;
222 case TIOCL_SELPOINTER
:
223 highlight_pointer(pe
);
229 /* remove the pointer */
230 highlight_pointer(-1);
232 /* select to end of line if on trailing space */
233 if (new_sel_end
> new_sel_start
&&
234 !atedge(new_sel_end
, vc
->vc_size_row
) &&
235 isspace(sel_pos(new_sel_end
))) {
236 for (pe
= new_sel_end
+ 2; ; pe
+= 2)
237 if (!isspace(sel_pos(pe
)) ||
238 atedge(pe
, vc
->vc_size_row
))
240 if (isspace(sel_pos(pe
)))
243 if (sel_start
== -1) /* no current selection */
244 highlight(new_sel_start
, new_sel_end
);
245 else if (new_sel_start
== sel_start
)
247 if (new_sel_end
== sel_end
) /* no action required */
249 else if (new_sel_end
> sel_end
) /* extend to right */
250 highlight(sel_end
+ 2, new_sel_end
);
251 else /* contract from right */
252 highlight(new_sel_end
+ 2, sel_end
);
254 else if (new_sel_end
== sel_end
)
256 if (new_sel_start
< sel_start
) /* extend to left */
257 highlight(new_sel_start
, sel_start
- 2);
258 else /* contract from left */
259 highlight(sel_start
, new_sel_start
- 2);
261 else /* some other case; start selection from scratch */
264 highlight(new_sel_start
, new_sel_end
);
266 sel_start
= new_sel_start
;
267 sel_end
= new_sel_end
;
269 /* Allocate a new buffer before freeing the old one ... */
270 multiplier
= use_unicode
? 3 : 1; /* chars can take up to 3 bytes */
271 bp
= kmalloc(((sel_end
-sel_start
)/2+1)*multiplier
, GFP_KERNEL
);
273 printk(KERN_WARNING
"selection: kmalloc() failed\n");
281 for (i
= sel_start
; i
<= sel_end
; i
+= 2) {
284 bp
+= store_utf8(c
, bp
);
289 if (! ((i
+ 2) % vc
->vc_size_row
)) {
290 /* strip trailing blanks from line and add newline,
291 unless non-space at end of line. */
299 sel_buffer_lth
= bp
- sel_buffer
;
303 /* Insert the contents of the selection buffer into the
304 * queue of the tty associated with the current console.
305 * Invoked by ioctl().
307 int paste_selection(struct tty_struct
*tty
)
309 struct vc_data
*vc
= tty
->driver_data
;
312 struct tty_ldisc
*ld
;
313 DECLARE_WAITQUEUE(wait
, current
);
315 acquire_console_sem();
316 poke_blanked_console();
317 release_console_sem();
319 ld
= tty_ldisc_ref_wait(tty
);
321 add_wait_queue(&vc
->paste_wait
, &wait
);
322 while (sel_buffer
&& sel_buffer_lth
> pasted
) {
323 set_current_state(TASK_INTERRUPTIBLE
);
324 if (test_bit(TTY_THROTTLED
, &tty
->flags
)) {
328 count
= sel_buffer_lth
- pasted
;
329 count
= min(count
, tty
->receive_room
);
330 tty
->ldisc
.ops
->receive_buf(tty
, sel_buffer
+ pasted
,
334 remove_wait_queue(&vc
->paste_wait
, &wait
);
335 __set_current_state(TASK_RUNNING
);
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