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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/*
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 <linux/uaccess.h>
20
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>
28
29/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
30#define isspace(c) ((c) == ' ')
31
32extern void poke_blanked_console(void);
33
34/* FIXME: all this needs locking */
35/* Variables for selection control. */
36/* Use a dynamic buffer, instead of static (Dec 1994) */
37struct vc_data *sel_cons; /* must not be deallocated */
38static int use_unicode;
39static volatile int sel_start = -1; /* cleared by clear_selection */
40static int sel_end;
41static int sel_buffer_lth;
42static 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. */
48static 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 */
54static inline void highlight_pointer(const int where)
55{
56 complement_pos(sel_cons, where);
57}
58
59static u16
60sel_pos(int n)
61{
62 return inverse_translate(sel_cons, screen_glyph(sel_cons, n),
63 use_unicode);
64}
65
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 */
72void clear_selection(void)
73{
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?
83 * 256 bits. Locked by the console lock.
84 */
85static 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
96static inline int inword(const u16 c) {
97 return c > 0xff || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
98}
99
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 */
107int sel_loadlut(char __user *p)
108{
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;
114}
115
116/* does screen address p correspond to character at LH/RH edge of screen? */
117static 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 */
123static inline unsigned short limit(const unsigned short v, const unsigned short u)
124{
125 return (v > u) ? u : v;
126}
127
128/* stores the char in UTF8 and returns the number of bytes used (1-3) */
129static 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
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 */
159int 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;
164 int i, ps, pe, multiplier;
165 u16 c;
166 int mode;
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 }
210 mode = vt_do_kdgkbmode(fg_console);
211 if (mode == K_UNICODE)
212 use_unicode = 1;
213 else
214 use_unicode = 0;
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 ... */
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);
299 if (!bp) {
300 printk(KERN_WARNING "selection: kmalloc() failed\n");
301 clear_selection();
302 return -ENOMEM;
303 }
304 kfree(sel_buffer);
305 sel_buffer = bp;
306
307 obp = bp;
308 for (i = sel_start; i <= sel_end; i += 2) {
309 c = sel_pos(i);
310 if (use_unicode)
311 bp += store_utf8(c, bp);
312 else
313 *bp++ = c;
314 if (!isspace(c))
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().
333 *
334 * Locking: called without locks. Calls the ldisc wrongly with
335 * unsafe methods,
336 */
337int paste_selection(struct tty_struct *tty)
338{
339 struct vc_data *vc = tty->driver_data;
340 int pasted = 0;
341 unsigned int count;
342 struct tty_ldisc *ld;
343 DECLARE_WAITQUEUE(wait, current);
344
345 console_lock();
346 poke_blanked_console();
347 console_unlock();
348
349 ld = tty_ldisc_ref_wait(tty);
350 if (!ld)
351 return -EIO; /* ldisc was hung up */
352 tty_buffer_lock_exclusive(&vc->port);
353
354 add_wait_queue(&vc->paste_wait, &wait);
355 while (sel_buffer && sel_buffer_lth > pasted) {
356 set_current_state(TASK_INTERRUPTIBLE);
357 if (tty_throttled(tty)) {
358 schedule();
359 continue;
360 }
361 __set_current_state(TASK_RUNNING);
362 count = sel_buffer_lth - pasted;
363 count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL,
364 count);
365 pasted += count;
366 }
367 remove_wait_queue(&vc->paste_wait, &wait);
368 __set_current_state(TASK_RUNNING);
369
370 tty_buffer_unlock_exclusive(&vc->port);
371 tty_ldisc_deref(ld);
372 return 0;
373}