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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * This module exports the functions:
4 *
5 * 'int set_selection_user(struct tiocl_selection __user *,
6 * struct tty_struct *)'
7 * 'int set_selection_kernel(struct tiocl_selection *, struct tty_struct *)'
8 * 'void clear_selection(void)'
9 * 'int paste_selection(struct tty_struct *)'
10 * 'int sel_loadlut(char __user *)'
11 *
12 * Now that /dev/vcs exists, most of this can disappear again.
13 */
14
15#include <linux/module.h>
16#include <linux/tty.h>
17#include <linux/sched.h>
18#include <linux/mm.h>
19#include <linux/mutex.h>
20#include <linux/slab.h>
21#include <linux/types.h>
22
23#include <linux/uaccess.h>
24
25#include <linux/kbd_kern.h>
26#include <linux/vt_kern.h>
27#include <linux/consolemap.h>
28#include <linux/selection.h>
29#include <linux/tiocl.h>
30#include <linux/console.h>
31#include <linux/tty_flip.h>
32
33#include <linux/sched/signal.h>
34
35/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
36#define isspace(c) ((c) == ' ')
37
38/* FIXME: all this needs locking */
39static struct vc_selection {
40 struct mutex lock;
41 struct vc_data *cons; /* must not be deallocated */
42 char *buffer;
43 unsigned int buf_len;
44 volatile int start; /* cleared by clear_selection */
45 int end;
46} vc_sel = {
47 .lock = __MUTEX_INITIALIZER(vc_sel.lock),
48 .start = -1,
49};
50
51/* clear_selection, highlight and highlight_pointer can be called
52 from interrupt (via scrollback/front) */
53
54/* set reverse video on characters s-e of console with selection. */
55static inline void highlight(const int s, const int e)
56{
57 invert_screen(vc_sel.cons, s, e-s+2, 1);
58}
59
60/* use complementary color to show the pointer */
61static inline void highlight_pointer(const int where)
62{
63 complement_pos(vc_sel.cons, where);
64}
65
66static u32
67sel_pos(int n, bool unicode)
68{
69 if (unicode)
70 return screen_glyph_unicode(vc_sel.cons, n / 2);
71 return inverse_translate(vc_sel.cons, screen_glyph(vc_sel.cons, n), 0);
72}
73
74/**
75 * clear_selection - remove current selection
76 *
77 * Remove the current selection highlight, if any from the console
78 * holding the selection. The caller must hold the console lock.
79 */
80void clear_selection(void)
81{
82 highlight_pointer(-1); /* hide the pointer */
83 if (vc_sel.start != -1) {
84 highlight(vc_sel.start, vc_sel.end);
85 vc_sel.start = -1;
86 }
87}
88EXPORT_SYMBOL_GPL(clear_selection);
89
90bool vc_is_sel(struct vc_data *vc)
91{
92 return vc == vc_sel.cons;
93}
94
95/*
96 * User settable table: what characters are to be considered alphabetic?
97 * 128 bits. Locked by the console lock.
98 */
99static u32 inwordLut[]={
100 0x00000000, /* control chars */
101 0x03FFE000, /* digits and "-./" */
102 0x87FFFFFE, /* uppercase and '_' */
103 0x07FFFFFE, /* lowercase */
104};
105
106static inline int inword(const u32 c)
107{
108 return c > 0x7f || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
109}
110
111/**
112 * set loadlut - load the LUT table
113 * @p: user table
114 *
115 * Load the LUT table from user space. The caller must hold the console
116 * lock. Make a temporary copy so a partial update doesn't make a mess.
117 */
118int sel_loadlut(char __user *p)
119{
120 u32 tmplut[ARRAY_SIZE(inwordLut)];
121 if (copy_from_user(tmplut, (u32 __user *)(p+4), sizeof(inwordLut)))
122 return -EFAULT;
123 memcpy(inwordLut, tmplut, sizeof(inwordLut));
124 return 0;
125}
126
127/* does screen address p correspond to character at LH/RH edge of screen? */
128static inline int atedge(const int p, int size_row)
129{
130 return (!(p % size_row) || !((p + 2) % size_row));
131}
132
133/* stores the char in UTF8 and returns the number of bytes used (1-4) */
134static int store_utf8(u32 c, char *p)
135{
136 if (c < 0x80) {
137 /* 0******* */
138 p[0] = c;
139 return 1;
140 } else if (c < 0x800) {
141 /* 110***** 10****** */
142 p[0] = 0xc0 | (c >> 6);
143 p[1] = 0x80 | (c & 0x3f);
144 return 2;
145 } else if (c < 0x10000) {
146 /* 1110**** 10****** 10****** */
147 p[0] = 0xe0 | (c >> 12);
148 p[1] = 0x80 | ((c >> 6) & 0x3f);
149 p[2] = 0x80 | (c & 0x3f);
150 return 3;
151 } else if (c < 0x110000) {
152 /* 11110*** 10****** 10****** 10****** */
153 p[0] = 0xf0 | (c >> 18);
154 p[1] = 0x80 | ((c >> 12) & 0x3f);
155 p[2] = 0x80 | ((c >> 6) & 0x3f);
156 p[3] = 0x80 | (c & 0x3f);
157 return 4;
158 } else {
159 /* outside Unicode, replace with U+FFFD */
160 p[0] = 0xef;
161 p[1] = 0xbf;
162 p[2] = 0xbd;
163 return 3;
164 }
165}
166
167/**
168 * set_selection_user - set the current selection.
169 * @sel: user selection info
170 * @tty: the console tty
171 *
172 * Invoked by the ioctl handle for the vt layer.
173 *
174 * The entire selection process is managed under the console_lock. It's
175 * a lot under the lock but its hardly a performance path
176 */
177int set_selection_user(const struct tiocl_selection __user *sel,
178 struct tty_struct *tty)
179{
180 struct tiocl_selection v;
181
182 if (copy_from_user(&v, sel, sizeof(*sel)))
183 return -EFAULT;
184
185 return set_selection_kernel(&v, tty);
186}
187
188static int vc_selection_store_chars(struct vc_data *vc, bool unicode)
189{
190 char *bp, *obp;
191 unsigned int i;
192
193 /* Allocate a new buffer before freeing the old one ... */
194 /* chars can take up to 4 bytes with unicode */
195 bp = kmalloc_array((vc_sel.end - vc_sel.start) / 2 + 1, unicode ? 4 : 1,
196 GFP_KERNEL | __GFP_NOWARN);
197 if (!bp) {
198 printk(KERN_WARNING "selection: kmalloc() failed\n");
199 clear_selection();
200 return -ENOMEM;
201 }
202 kfree(vc_sel.buffer);
203 vc_sel.buffer = bp;
204
205 obp = bp;
206 for (i = vc_sel.start; i <= vc_sel.end; i += 2) {
207 u32 c = sel_pos(i, unicode);
208 if (unicode)
209 bp += store_utf8(c, bp);
210 else
211 *bp++ = c;
212 if (!isspace(c))
213 obp = bp;
214 if (!((i + 2) % vc->vc_size_row)) {
215 /* strip trailing blanks from line and add newline,
216 unless non-space at end of line. */
217 if (obp != bp) {
218 bp = obp;
219 *bp++ = '\r';
220 }
221 obp = bp;
222 }
223 }
224 vc_sel.buf_len = bp - vc_sel.buffer;
225
226 return 0;
227}
228
229static int vc_do_selection(struct vc_data *vc, unsigned short mode, int ps,
230 int pe)
231{
232 int new_sel_start, new_sel_end, spc;
233 bool unicode = vt_do_kdgkbmode(fg_console) == K_UNICODE;
234
235 switch (mode) {
236 case TIOCL_SELCHAR: /* character-by-character selection */
237 new_sel_start = ps;
238 new_sel_end = pe;
239 break;
240 case TIOCL_SELWORD: /* word-by-word selection */
241 spc = isspace(sel_pos(ps, unicode));
242 for (new_sel_start = ps; ; ps -= 2) {
243 if ((spc && !isspace(sel_pos(ps, unicode))) ||
244 (!spc && !inword(sel_pos(ps, unicode))))
245 break;
246 new_sel_start = ps;
247 if (!(ps % vc->vc_size_row))
248 break;
249 }
250
251 spc = isspace(sel_pos(pe, unicode));
252 for (new_sel_end = pe; ; pe += 2) {
253 if ((spc && !isspace(sel_pos(pe, unicode))) ||
254 (!spc && !inword(sel_pos(pe, unicode))))
255 break;
256 new_sel_end = pe;
257 if (!((pe + 2) % vc->vc_size_row))
258 break;
259 }
260 break;
261 case TIOCL_SELLINE: /* line-by-line selection */
262 new_sel_start = rounddown(ps, vc->vc_size_row);
263 new_sel_end = rounddown(pe, vc->vc_size_row) +
264 vc->vc_size_row - 2;
265 break;
266 case TIOCL_SELPOINTER:
267 highlight_pointer(pe);
268 return 0;
269 default:
270 return -EINVAL;
271 }
272
273 /* remove the pointer */
274 highlight_pointer(-1);
275
276 /* select to end of line if on trailing space */
277 if (new_sel_end > new_sel_start &&
278 !atedge(new_sel_end, vc->vc_size_row) &&
279 isspace(sel_pos(new_sel_end, unicode))) {
280 for (pe = new_sel_end + 2; ; pe += 2)
281 if (!isspace(sel_pos(pe, unicode)) ||
282 atedge(pe, vc->vc_size_row))
283 break;
284 if (isspace(sel_pos(pe, unicode)))
285 new_sel_end = pe;
286 }
287 if (vc_sel.start == -1) /* no current selection */
288 highlight(new_sel_start, new_sel_end);
289 else if (new_sel_start == vc_sel.start)
290 {
291 if (new_sel_end == vc_sel.end) /* no action required */
292 return 0;
293 else if (new_sel_end > vc_sel.end) /* extend to right */
294 highlight(vc_sel.end + 2, new_sel_end);
295 else /* contract from right */
296 highlight(new_sel_end + 2, vc_sel.end);
297 }
298 else if (new_sel_end == vc_sel.end)
299 {
300 if (new_sel_start < vc_sel.start) /* extend to left */
301 highlight(new_sel_start, vc_sel.start - 2);
302 else /* contract from left */
303 highlight(vc_sel.start, new_sel_start - 2);
304 }
305 else /* some other case; start selection from scratch */
306 {
307 clear_selection();
308 highlight(new_sel_start, new_sel_end);
309 }
310 vc_sel.start = new_sel_start;
311 vc_sel.end = new_sel_end;
312
313 return vc_selection_store_chars(vc, unicode);
314}
315
316static int vc_selection(struct vc_data *vc, struct tiocl_selection *v,
317 struct tty_struct *tty)
318{
319 int ps, pe;
320
321 poke_blanked_console();
322
323 if (v->sel_mode == TIOCL_SELCLEAR) {
324 /* useful for screendump without selection highlights */
325 clear_selection();
326 return 0;
327 }
328
329 v->xs = min_t(u16, v->xs - 1, vc->vc_cols - 1);
330 v->ys = min_t(u16, v->ys - 1, vc->vc_rows - 1);
331 v->xe = min_t(u16, v->xe - 1, vc->vc_cols - 1);
332 v->ye = min_t(u16, v->ye - 1, vc->vc_rows - 1);
333
334 if (mouse_reporting() && (v->sel_mode & TIOCL_SELMOUSEREPORT)) {
335 mouse_report(tty, v->sel_mode & TIOCL_SELBUTTONMASK, v->xs,
336 v->ys);
337 return 0;
338 }
339
340 ps = v->ys * vc->vc_size_row + (v->xs << 1);
341 pe = v->ye * vc->vc_size_row + (v->xe << 1);
342 if (ps > pe) /* make vc_sel.start <= vc_sel.end */
343 swap(ps, pe);
344
345 if (vc_sel.cons != vc) {
346 clear_selection();
347 vc_sel.cons = vc;
348 }
349
350 return vc_do_selection(vc, v->sel_mode, ps, pe);
351}
352
353int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty)
354{
355 int ret;
356
357 mutex_lock(&vc_sel.lock);
358 console_lock();
359 ret = vc_selection(vc_cons[fg_console].d, v, tty);
360 console_unlock();
361 mutex_unlock(&vc_sel.lock);
362
363 return ret;
364}
365EXPORT_SYMBOL_GPL(set_selection_kernel);
366
367/* Insert the contents of the selection buffer into the
368 * queue of the tty associated with the current console.
369 * Invoked by ioctl().
370 *
371 * Locking: called without locks. Calls the ldisc wrongly with
372 * unsafe methods,
373 */
374int paste_selection(struct tty_struct *tty)
375{
376 struct vc_data *vc = tty->driver_data;
377 int pasted = 0;
378 unsigned int count;
379 struct tty_ldisc *ld;
380 DECLARE_WAITQUEUE(wait, current);
381 int ret = 0;
382
383 console_lock();
384 poke_blanked_console();
385 console_unlock();
386
387 ld = tty_ldisc_ref_wait(tty);
388 if (!ld)
389 return -EIO; /* ldisc was hung up */
390 tty_buffer_lock_exclusive(&vc->port);
391
392 add_wait_queue(&vc->paste_wait, &wait);
393 mutex_lock(&vc_sel.lock);
394 while (vc_sel.buffer && vc_sel.buf_len > pasted) {
395 set_current_state(TASK_INTERRUPTIBLE);
396 if (signal_pending(current)) {
397 ret = -EINTR;
398 break;
399 }
400 if (tty_throttled(tty)) {
401 mutex_unlock(&vc_sel.lock);
402 schedule();
403 mutex_lock(&vc_sel.lock);
404 continue;
405 }
406 __set_current_state(TASK_RUNNING);
407 count = vc_sel.buf_len - pasted;
408 count = tty_ldisc_receive_buf(ld, vc_sel.buffer + pasted, NULL,
409 count);
410 pasted += count;
411 }
412 mutex_unlock(&vc_sel.lock);
413 remove_wait_queue(&vc->paste_wait, &wait);
414 __set_current_state(TASK_RUNNING);
415
416 tty_buffer_unlock_exclusive(&vc->port);
417 tty_ldisc_deref(ld);
418 return ret;
419}
420EXPORT_SYMBOL_GPL(paste_selection);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * This module exports the functions:
4 *
5 * 'int set_selection_user(struct tiocl_selection __user *,
6 * struct tty_struct *)'
7 * 'int set_selection_kernel(struct tiocl_selection *, struct tty_struct *)'
8 * 'void clear_selection(void)'
9 * 'int paste_selection(struct tty_struct *)'
10 * 'int sel_loadlut(u32 __user *)'
11 *
12 * Now that /dev/vcs exists, most of this can disappear again.
13 */
14
15#include <linux/module.h>
16#include <linux/tty.h>
17#include <linux/sched.h>
18#include <linux/mm.h>
19#include <linux/mutex.h>
20#include <linux/slab.h>
21#include <linux/types.h>
22
23#include <linux/uaccess.h>
24
25#include <linux/kbd_kern.h>
26#include <linux/vt_kern.h>
27#include <linux/consolemap.h>
28#include <linux/selection.h>
29#include <linux/tiocl.h>
30#include <linux/console.h>
31#include <linux/tty_flip.h>
32
33#include <linux/sched/signal.h>
34
35/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
36#define is_space_on_vt(c) ((c) == ' ')
37
38/* FIXME: all this needs locking */
39static struct vc_selection {
40 struct mutex lock;
41 struct vc_data *cons; /* must not be deallocated */
42 char *buffer;
43 unsigned int buf_len;
44 volatile int start; /* cleared by clear_selection */
45 int end;
46} vc_sel = {
47 .lock = __MUTEX_INITIALIZER(vc_sel.lock),
48 .start = -1,
49};
50
51/* clear_selection, highlight and highlight_pointer can be called
52 from interrupt (via scrollback/front) */
53
54/* set reverse video on characters s-e of console with selection. */
55static inline void highlight(const int s, const int e)
56{
57 invert_screen(vc_sel.cons, s, e-s+2, true);
58}
59
60/* use complementary color to show the pointer */
61static inline void highlight_pointer(const int where)
62{
63 complement_pos(vc_sel.cons, where);
64}
65
66static u32
67sel_pos(int n, bool unicode)
68{
69 if (unicode)
70 return screen_glyph_unicode(vc_sel.cons, n / 2);
71 return inverse_translate(vc_sel.cons, screen_glyph(vc_sel.cons, n),
72 false);
73}
74
75/**
76 * clear_selection - remove current selection
77 *
78 * Remove the current selection highlight, if any from the console holding the
79 * selection.
80 *
81 * Locking: The caller must hold the console lock.
82 */
83void clear_selection(void)
84{
85 highlight_pointer(-1); /* hide the pointer */
86 if (vc_sel.start != -1) {
87 highlight(vc_sel.start, vc_sel.end);
88 vc_sel.start = -1;
89 }
90}
91EXPORT_SYMBOL_GPL(clear_selection);
92
93bool vc_is_sel(const struct vc_data *vc)
94{
95 return vc == vc_sel.cons;
96}
97
98/*
99 * User settable table: what characters are to be considered alphabetic?
100 * 128 bits. Locked by the console lock.
101 */
102static u32 inwordLut[]={
103 0x00000000, /* control chars */
104 0x03FFE000, /* digits and "-./" */
105 0x87FFFFFE, /* uppercase and '_' */
106 0x07FFFFFE, /* lowercase */
107};
108
109static inline int inword(const u32 c)
110{
111 return c > 0x7f || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
112}
113
114/**
115 * sel_loadlut() - load the LUT table
116 * @lut: user table
117 *
118 * Load the LUT table from user space. Make a temporary copy so a partial
119 * update doesn't make a mess.
120 *
121 * Locking: The console lock is acquired.
122 */
123int sel_loadlut(u32 __user *lut)
124{
125 u32 tmplut[ARRAY_SIZE(inwordLut)];
126
127 if (copy_from_user(tmplut, lut, sizeof(inwordLut)))
128 return -EFAULT;
129
130 console_lock();
131 memcpy(inwordLut, tmplut, sizeof(inwordLut));
132 console_unlock();
133
134 return 0;
135}
136
137/* does screen address p correspond to character at LH/RH edge of screen? */
138static inline int atedge(const int p, int size_row)
139{
140 return (!(p % size_row) || !((p + 2) % size_row));
141}
142
143/* stores the char in UTF8 and returns the number of bytes used (1-4) */
144static int store_utf8(u32 c, char *p)
145{
146 if (c < 0x80) {
147 /* 0******* */
148 p[0] = c;
149 return 1;
150 } else if (c < 0x800) {
151 /* 110***** 10****** */
152 p[0] = 0xc0 | (c >> 6);
153 p[1] = 0x80 | (c & 0x3f);
154 return 2;
155 } else if (c < 0x10000) {
156 /* 1110**** 10****** 10****** */
157 p[0] = 0xe0 | (c >> 12);
158 p[1] = 0x80 | ((c >> 6) & 0x3f);
159 p[2] = 0x80 | (c & 0x3f);
160 return 3;
161 } else if (c < 0x110000) {
162 /* 11110*** 10****** 10****** 10****** */
163 p[0] = 0xf0 | (c >> 18);
164 p[1] = 0x80 | ((c >> 12) & 0x3f);
165 p[2] = 0x80 | ((c >> 6) & 0x3f);
166 p[3] = 0x80 | (c & 0x3f);
167 return 4;
168 } else {
169 /* outside Unicode, replace with U+FFFD */
170 p[0] = 0xef;
171 p[1] = 0xbf;
172 p[2] = 0xbd;
173 return 3;
174 }
175}
176
177/**
178 * set_selection_user - set the current selection.
179 * @sel: user selection info
180 * @tty: the console tty
181 *
182 * Invoked by the ioctl handle for the vt layer.
183 *
184 * Locking: The entire selection process is managed under the console_lock.
185 * It's a lot under the lock but its hardly a performance path.
186 */
187int set_selection_user(const struct tiocl_selection __user *sel,
188 struct tty_struct *tty)
189{
190 struct tiocl_selection v;
191
192 if (copy_from_user(&v, sel, sizeof(*sel)))
193 return -EFAULT;
194
195 /*
196 * TIOCL_SELCLEAR, TIOCL_SELPOINTER and TIOCL_SELMOUSEREPORT are OK to
197 * use without CAP_SYS_ADMIN as they do not modify the selection.
198 */
199 switch (v.sel_mode) {
200 case TIOCL_SELCLEAR:
201 case TIOCL_SELPOINTER:
202 case TIOCL_SELMOUSEREPORT:
203 break;
204 default:
205 if (!capable(CAP_SYS_ADMIN))
206 return -EPERM;
207 }
208
209 return set_selection_kernel(&v, tty);
210}
211
212static int vc_selection_store_chars(struct vc_data *vc, bool unicode)
213{
214 char *bp, *obp;
215 unsigned int i;
216
217 /* Allocate a new buffer before freeing the old one ... */
218 /* chars can take up to 4 bytes with unicode */
219 bp = kmalloc_array((vc_sel.end - vc_sel.start) / 2 + 1, unicode ? 4 : 1,
220 GFP_KERNEL | __GFP_NOWARN);
221 if (!bp) {
222 printk(KERN_WARNING "selection: kmalloc() failed\n");
223 clear_selection();
224 return -ENOMEM;
225 }
226 kfree(vc_sel.buffer);
227 vc_sel.buffer = bp;
228
229 obp = bp;
230 for (i = vc_sel.start; i <= vc_sel.end; i += 2) {
231 u32 c = sel_pos(i, unicode);
232 if (unicode)
233 bp += store_utf8(c, bp);
234 else
235 *bp++ = c;
236 if (!is_space_on_vt(c))
237 obp = bp;
238 if (!((i + 2) % vc->vc_size_row)) {
239 /* strip trailing blanks from line and add newline,
240 unless non-space at end of line. */
241 if (obp != bp) {
242 bp = obp;
243 *bp++ = '\r';
244 }
245 obp = bp;
246 }
247 }
248 vc_sel.buf_len = bp - vc_sel.buffer;
249
250 return 0;
251}
252
253static int vc_do_selection(struct vc_data *vc, unsigned short mode, int ps,
254 int pe)
255{
256 int new_sel_start, new_sel_end, spc;
257 bool unicode = vt_do_kdgkbmode(fg_console) == K_UNICODE;
258
259 switch (mode) {
260 case TIOCL_SELCHAR: /* character-by-character selection */
261 new_sel_start = ps;
262 new_sel_end = pe;
263 break;
264 case TIOCL_SELWORD: /* word-by-word selection */
265 spc = is_space_on_vt(sel_pos(ps, unicode));
266 for (new_sel_start = ps; ; ps -= 2) {
267 if ((spc && !is_space_on_vt(sel_pos(ps, unicode))) ||
268 (!spc && !inword(sel_pos(ps, unicode))))
269 break;
270 new_sel_start = ps;
271 if (!(ps % vc->vc_size_row))
272 break;
273 }
274
275 spc = is_space_on_vt(sel_pos(pe, unicode));
276 for (new_sel_end = pe; ; pe += 2) {
277 if ((spc && !is_space_on_vt(sel_pos(pe, unicode))) ||
278 (!spc && !inword(sel_pos(pe, unicode))))
279 break;
280 new_sel_end = pe;
281 if (!((pe + 2) % vc->vc_size_row))
282 break;
283 }
284 break;
285 case TIOCL_SELLINE: /* line-by-line selection */
286 new_sel_start = rounddown(ps, vc->vc_size_row);
287 new_sel_end = rounddown(pe, vc->vc_size_row) +
288 vc->vc_size_row - 2;
289 break;
290 case TIOCL_SELPOINTER:
291 highlight_pointer(pe);
292 return 0;
293 default:
294 return -EINVAL;
295 }
296
297 /* remove the pointer */
298 highlight_pointer(-1);
299
300 /* select to end of line if on trailing space */
301 if (new_sel_end > new_sel_start &&
302 !atedge(new_sel_end, vc->vc_size_row) &&
303 is_space_on_vt(sel_pos(new_sel_end, unicode))) {
304 for (pe = new_sel_end + 2; ; pe += 2)
305 if (!is_space_on_vt(sel_pos(pe, unicode)) ||
306 atedge(pe, vc->vc_size_row))
307 break;
308 if (is_space_on_vt(sel_pos(pe, unicode)))
309 new_sel_end = pe;
310 }
311 if (vc_sel.start == -1) /* no current selection */
312 highlight(new_sel_start, new_sel_end);
313 else if (new_sel_start == vc_sel.start)
314 {
315 if (new_sel_end == vc_sel.end) /* no action required */
316 return 0;
317 else if (new_sel_end > vc_sel.end) /* extend to right */
318 highlight(vc_sel.end + 2, new_sel_end);
319 else /* contract from right */
320 highlight(new_sel_end + 2, vc_sel.end);
321 }
322 else if (new_sel_end == vc_sel.end)
323 {
324 if (new_sel_start < vc_sel.start) /* extend to left */
325 highlight(new_sel_start, vc_sel.start - 2);
326 else /* contract from left */
327 highlight(vc_sel.start, new_sel_start - 2);
328 }
329 else /* some other case; start selection from scratch */
330 {
331 clear_selection();
332 highlight(new_sel_start, new_sel_end);
333 }
334 vc_sel.start = new_sel_start;
335 vc_sel.end = new_sel_end;
336
337 return vc_selection_store_chars(vc, unicode);
338}
339
340static int vc_selection(struct vc_data *vc, struct tiocl_selection *v,
341 struct tty_struct *tty)
342{
343 int ps, pe;
344
345 poke_blanked_console();
346
347 if (v->sel_mode == TIOCL_SELCLEAR) {
348 /* useful for screendump without selection highlights */
349 clear_selection();
350 return 0;
351 }
352
353 v->xs = min_t(u16, v->xs - 1, vc->vc_cols - 1);
354 v->ys = min_t(u16, v->ys - 1, vc->vc_rows - 1);
355 v->xe = min_t(u16, v->xe - 1, vc->vc_cols - 1);
356 v->ye = min_t(u16, v->ye - 1, vc->vc_rows - 1);
357
358 if (mouse_reporting() && (v->sel_mode & TIOCL_SELMOUSEREPORT)) {
359 mouse_report(tty, v->sel_mode & TIOCL_SELBUTTONMASK, v->xs,
360 v->ys);
361 return 0;
362 }
363
364 ps = v->ys * vc->vc_size_row + (v->xs << 1);
365 pe = v->ye * vc->vc_size_row + (v->xe << 1);
366 if (ps > pe) /* make vc_sel.start <= vc_sel.end */
367 swap(ps, pe);
368
369 if (vc_sel.cons != vc) {
370 clear_selection();
371 vc_sel.cons = vc;
372 }
373
374 return vc_do_selection(vc, v->sel_mode, ps, pe);
375}
376
377int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty)
378{
379 int ret;
380
381 mutex_lock(&vc_sel.lock);
382 console_lock();
383 ret = vc_selection(vc_cons[fg_console].d, v, tty);
384 console_unlock();
385 mutex_unlock(&vc_sel.lock);
386
387 return ret;
388}
389EXPORT_SYMBOL_GPL(set_selection_kernel);
390
391/* Insert the contents of the selection buffer into the
392 * queue of the tty associated with the current console.
393 * Invoked by ioctl().
394 *
395 * Locking: called without locks. Calls the ldisc wrongly with
396 * unsafe methods,
397 */
398int paste_selection(struct tty_struct *tty)
399{
400 struct vc_data *vc = tty->driver_data;
401 int pasted = 0;
402 size_t count;
403 struct tty_ldisc *ld;
404 DECLARE_WAITQUEUE(wait, current);
405 int ret = 0;
406
407 console_lock();
408 poke_blanked_console();
409 console_unlock();
410
411 ld = tty_ldisc_ref_wait(tty);
412 if (!ld)
413 return -EIO; /* ldisc was hung up */
414 tty_buffer_lock_exclusive(&vc->port);
415
416 add_wait_queue(&vc->paste_wait, &wait);
417 mutex_lock(&vc_sel.lock);
418 while (vc_sel.buffer && vc_sel.buf_len > pasted) {
419 set_current_state(TASK_INTERRUPTIBLE);
420 if (signal_pending(current)) {
421 ret = -EINTR;
422 break;
423 }
424 if (tty_throttled(tty)) {
425 mutex_unlock(&vc_sel.lock);
426 schedule();
427 mutex_lock(&vc_sel.lock);
428 continue;
429 }
430 __set_current_state(TASK_RUNNING);
431 count = vc_sel.buf_len - pasted;
432 count = tty_ldisc_receive_buf(ld, vc_sel.buffer + pasted, NULL,
433 count);
434 pasted += count;
435 }
436 mutex_unlock(&vc_sel.lock);
437 remove_wait_queue(&vc->paste_wait, &wait);
438 __set_current_state(TASK_RUNNING);
439
440 tty_buffer_unlock_exclusive(&vc->port);
441 tty_ldisc_deref(ld);
442 return ret;
443}
444EXPORT_SYMBOL_GPL(paste_selection);