Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * This module exports the functions: |
3 | * | |
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 *)' | |
8 | * | |
9 | * Now that /dev/vcs exists, most of this can disappear again. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/tty.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/types.h> | |
18 | ||
19 | #include <asm/uaccess.h> | |
20 | ||
759448f4 | 21 | #include <linux/kbd_kern.h> |
1da177e4 LT |
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> | |
a7c8d58c | 27 | #include <linux/tty_flip.h> |
1da177e4 LT |
28 | |
29 | /* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */ | |
30 | #define isspace(c) ((c) == ' ') | |
31 | ||
32 | extern void poke_blanked_console(void); | |
33 | ||
079c9534 | 34 | /* FIXME: all this needs locking */ |
1da177e4 LT |
35 | /* Variables for selection control. */ |
36 | /* Use a dynamic buffer, instead of static (Dec 1994) */ | |
ca9bda00 | 37 | struct vc_data *sel_cons; /* must not be deallocated */ |
759448f4 | 38 | static int use_unicode; |
1da177e4 LT |
39 | static volatile int sel_start = -1; /* cleared by clear_selection */ |
40 | static int sel_end; | |
41 | static int sel_buffer_lth; | |
42 | static char *sel_buffer; | |
43 | ||
44 | /* clear_selection, highlight and highlight_pointer can be called | |
45 | from interrupt (via scrollback/front) */ | |
46 | ||
47 | /* set reverse video on characters s-e of console with selection. */ | |
48 | static inline void highlight(const int s, const int e) | |
49 | { | |
50 | invert_screen(sel_cons, s, e-s+2, 1); | |
51 | } | |
52 | ||
53 | /* use complementary color to show the pointer */ | |
54 | static inline void highlight_pointer(const int where) | |
55 | { | |
56 | complement_pos(sel_cons, where); | |
57 | } | |
58 | ||
759448f4 | 59 | static u16 |
1da177e4 LT |
60 | sel_pos(int n) |
61 | { | |
759448f4 JE |
62 | return inverse_translate(sel_cons, screen_glyph(sel_cons, n), |
63 | use_unicode); | |
1da177e4 LT |
64 | } |
65 | ||
5289475d AC |
66 | /** |
67 | * clear_selection - remove current selection | |
68 | * | |
69 | * Remove the current selection highlight, if any from the console | |
70 | * holding the selection. The caller must hold the console lock. | |
71 | */ | |
72 | void clear_selection(void) | |
73 | { | |
1da177e4 LT |
74 | highlight_pointer(-1); /* hide the pointer */ |
75 | if (sel_start != -1) { | |
76 | highlight(sel_start, sel_end); | |
77 | sel_start = -1; | |
78 | } | |
79 | } | |
80 | ||
81 | /* | |
82 | * User settable table: what characters are to be considered alphabetic? | |
5289475d | 83 | * 256 bits. Locked by the console lock. |
1da177e4 LT |
84 | */ |
85 | static u32 inwordLut[8]={ | |
86 | 0x00000000, /* control chars */ | |
87 | 0x03FF0000, /* digits */ | |
88 | 0x87FFFFFE, /* uppercase and '_' */ | |
89 | 0x07FFFFFE, /* lowercase */ | |
90 | 0x00000000, | |
91 | 0x00000000, | |
92 | 0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */ | |
93 | 0xFF7FFFFF /* latin-1 accented letters, not division sign */ | |
94 | }; | |
95 | ||
759448f4 JE |
96 | static inline int inword(const u16 c) { |
97 | return c > 0xff || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1); | |
1da177e4 LT |
98 | } |
99 | ||
5289475d AC |
100 | /** |
101 | * set loadlut - load the LUT table | |
102 | * @p: user table | |
103 | * | |
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. | |
106 | */ | |
1da177e4 LT |
107 | int sel_loadlut(char __user *p) |
108 | { | |
5289475d AC |
109 | u32 tmplut[8]; |
110 | if (copy_from_user(tmplut, (u32 __user *)(p+4), 32)) | |
111 | return -EFAULT; | |
112 | memcpy(inwordLut, tmplut, 32); | |
113 | return 0; | |
1da177e4 LT |
114 | } |
115 | ||
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) | |
118 | { | |
119 | return (!(p % size_row) || !((p + 2) % size_row)); | |
120 | } | |
121 | ||
122 | /* constrain v such that v <= u */ | |
123 | static inline unsigned short limit(const unsigned short v, const unsigned short u) | |
124 | { | |
125 | return (v > u) ? u : v; | |
126 | } | |
127 | ||
759448f4 JE |
128 | /* stores the char in UTF8 and returns the number of bytes used (1-3) */ |
129 | static int store_utf8(u16 c, char *p) | |
130 | { | |
131 | if (c < 0x80) { | |
132 | /* 0******* */ | |
133 | p[0] = c; | |
134 | return 1; | |
135 | } else if (c < 0x800) { | |
136 | /* 110***** 10****** */ | |
137 | p[0] = 0xc0 | (c >> 6); | |
138 | p[1] = 0x80 | (c & 0x3f); | |
139 | return 2; | |
140 | } else { | |
141 | /* 1110**** 10****** 10****** */ | |
142 | p[0] = 0xe0 | (c >> 12); | |
143 | p[1] = 0x80 | ((c >> 6) & 0x3f); | |
144 | p[2] = 0x80 | (c & 0x3f); | |
145 | return 3; | |
146 | } | |
147 | } | |
148 | ||
5289475d AC |
149 | /** |
150 | * set_selection - set the current selection. | |
151 | * @sel: user selection info | |
152 | * @tty: the console tty | |
153 | * | |
154 | * Invoked by the ioctl handle for the vt layer. | |
155 | * | |
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 | |
158 | */ | |
1da177e4 LT |
159 | int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty) |
160 | { | |
161 | struct vc_data *vc = vc_cons[fg_console].d; | |
162 | int sel_mode, new_sel_start, new_sel_end, spc; | |
163 | char *bp, *obp; | |
759448f4 JE |
164 | int i, ps, pe, multiplier; |
165 | u16 c; | |
079c9534 | 166 | int mode; |
1da177e4 LT |
167 | |
168 | poke_blanked_console(); | |
169 | ||
170 | { unsigned short xs, ys, xe, ye; | |
171 | ||
172 | if (!access_ok(VERIFY_READ, sel, sizeof(*sel))) | |
173 | return -EFAULT; | |
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); | |
186 | ||
187 | if (sel_mode == TIOCL_SELCLEAR) { | |
188 | /* useful for screendump without selection highlights */ | |
189 | clear_selection(); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | if (mouse_reporting() && (sel_mode & TIOCL_SELMOUSEREPORT)) { | |
194 | mouse_report(tty, sel_mode & TIOCL_SELBUTTONMASK, xs, ys); | |
195 | return 0; | |
196 | } | |
197 | } | |
198 | ||
199 | if (ps > pe) /* make sel_start <= sel_end */ | |
200 | { | |
201 | int tmp = ps; | |
202 | ps = pe; | |
203 | pe = tmp; | |
204 | } | |
205 | ||
206 | if (sel_cons != vc_cons[fg_console].d) { | |
207 | clear_selection(); | |
208 | sel_cons = vc_cons[fg_console].d; | |
209 | } | |
079c9534 AC |
210 | mode = vt_do_kdgkbmode(fg_console); |
211 | if (mode == K_UNICODE) | |
212 | use_unicode = 1; | |
213 | else | |
214 | use_unicode = 0; | |
1da177e4 LT |
215 | |
216 | switch (sel_mode) | |
217 | { | |
218 | case TIOCL_SELCHAR: /* character-by-character selection */ | |
219 | new_sel_start = ps; | |
220 | new_sel_end = pe; | |
221 | break; | |
222 | case TIOCL_SELWORD: /* word-by-word selection */ | |
223 | spc = isspace(sel_pos(ps)); | |
224 | for (new_sel_start = ps; ; ps -= 2) | |
225 | { | |
226 | if ((spc && !isspace(sel_pos(ps))) || | |
227 | (!spc && !inword(sel_pos(ps)))) | |
228 | break; | |
229 | new_sel_start = ps; | |
230 | if (!(ps % vc->vc_size_row)) | |
231 | break; | |
232 | } | |
233 | spc = isspace(sel_pos(pe)); | |
234 | for (new_sel_end = pe; ; pe += 2) | |
235 | { | |
236 | if ((spc && !isspace(sel_pos(pe))) || | |
237 | (!spc && !inword(sel_pos(pe)))) | |
238 | break; | |
239 | new_sel_end = pe; | |
240 | if (!((pe + 2) % vc->vc_size_row)) | |
241 | break; | |
242 | } | |
243 | break; | |
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; | |
248 | break; | |
249 | case TIOCL_SELPOINTER: | |
250 | highlight_pointer(pe); | |
251 | return 0; | |
252 | default: | |
253 | return -EINVAL; | |
254 | } | |
255 | ||
256 | /* remove the pointer */ | |
257 | highlight_pointer(-1); | |
258 | ||
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)) | |
266 | break; | |
267 | if (isspace(sel_pos(pe))) | |
268 | new_sel_end = pe; | |
269 | } | |
270 | if (sel_start == -1) /* no current selection */ | |
271 | highlight(new_sel_start, new_sel_end); | |
272 | else if (new_sel_start == sel_start) | |
273 | { | |
274 | if (new_sel_end == sel_end) /* no action required */ | |
275 | return 0; | |
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); | |
280 | } | |
281 | else if (new_sel_end == sel_end) | |
282 | { | |
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); | |
287 | } | |
288 | else /* some other case; start selection from scratch */ | |
289 | { | |
290 | clear_selection(); | |
291 | highlight(new_sel_start, new_sel_end); | |
292 | } | |
293 | sel_start = new_sel_start; | |
294 | sel_end = new_sel_end; | |
295 | ||
296 | /* Allocate a new buffer before freeing the old one ... */ | |
759448f4 | 297 | multiplier = use_unicode ? 3 : 1; /* chars can take up to 3 bytes */ |
878b8619 | 298 | bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL); |
1da177e4 LT |
299 | if (!bp) { |
300 | printk(KERN_WARNING "selection: kmalloc() failed\n"); | |
301 | clear_selection(); | |
302 | return -ENOMEM; | |
303 | } | |
735d5661 | 304 | kfree(sel_buffer); |
1da177e4 LT |
305 | sel_buffer = bp; |
306 | ||
307 | obp = bp; | |
308 | for (i = sel_start; i <= sel_end; i += 2) { | |
759448f4 JE |
309 | c = sel_pos(i); |
310 | if (use_unicode) | |
311 | bp += store_utf8(c, bp); | |
312 | else | |
313 | *bp++ = c; | |
314 | if (!isspace(c)) | |
1da177e4 LT |
315 | obp = 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. */ | |
319 | if (obp != bp) { | |
320 | bp = obp; | |
321 | *bp++ = '\r'; | |
322 | } | |
323 | obp = bp; | |
324 | } | |
325 | } | |
326 | sel_buffer_lth = bp - sel_buffer; | |
327 | return 0; | |
328 | } | |
329 | ||
330 | /* Insert the contents of the selection buffer into the | |
331 | * queue of the tty associated with the current console. | |
332 | * Invoked by ioctl(). | |
906cbe13 | 333 | * |
20f62579 AC |
334 | * Locking: called without locks. Calls the ldisc wrongly with |
335 | * unsafe methods, | |
1da177e4 LT |
336 | */ |
337 | int paste_selection(struct tty_struct *tty) | |
338 | { | |
c9f19e96 | 339 | struct vc_data *vc = tty->driver_data; |
33f0f88f AC |
340 | int pasted = 0; |
341 | unsigned int count; | |
1da177e4 LT |
342 | struct tty_ldisc *ld; |
343 | DECLARE_WAITQUEUE(wait, current); | |
344 | ||
ac751efa | 345 | console_lock(); |
1da177e4 | 346 | poke_blanked_console(); |
ac751efa | 347 | console_unlock(); |
1da177e4 | 348 | |
7ee00fdb | 349 | ld = tty_ldisc_ref_wait(tty); |
e55afd11 PH |
350 | if (!ld) |
351 | return -EIO; /* ldisc was hung up */ | |
a7c8d58c | 352 | tty_buffer_lock_exclusive(&vc->port); |
60af22d2 | 353 | |
1da177e4 LT |
354 | add_wait_queue(&vc->paste_wait, &wait); |
355 | while (sel_buffer && sel_buffer_lth > pasted) { | |
356 | set_current_state(TASK_INTERRUPTIBLE); | |
97ef38b8 | 357 | if (tty_throttled(tty)) { |
1da177e4 LT |
358 | schedule(); |
359 | continue; | |
360 | } | |
61e86cc9 | 361 | __set_current_state(TASK_RUNNING); |
1da177e4 | 362 | count = sel_buffer_lth - pasted; |
24a89d1c PH |
363 | count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL, |
364 | count); | |
1da177e4 LT |
365 | pasted += count; |
366 | } | |
367 | remove_wait_queue(&vc->paste_wait, &wait); | |
cc0a8fbb | 368 | __set_current_state(TASK_RUNNING); |
1da177e4 | 369 | |
a7c8d58c | 370 | tty_buffer_unlock_exclusive(&vc->port); |
1da177e4 LT |
371 | tty_ldisc_deref(ld); |
372 | return 0; | |
373 | } |