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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 <asm/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
28/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
29#define isspace(c) ((c) == ' ')
30
31extern void poke_blanked_console(void);
32
33/* Variables for selection control. */
34/* Use a dynamic buffer, instead of static (Dec 1994) */
35struct vc_data *sel_cons; /* must not be deallocated */
36static int use_unicode;
37static volatile int sel_start = -1; /* cleared by clear_selection */
38static int sel_end;
39static int sel_buffer_lth;
40static char *sel_buffer;
41
42/* clear_selection, highlight and highlight_pointer can be called
43 from interrupt (via scrollback/front) */
44
45/* set reverse video on characters s-e of console with selection. */
46static inline void highlight(const int s, const int e)
47{
48 invert_screen(sel_cons, s, e-s+2, 1);
49}
50
51/* use complementary color to show the pointer */
52static inline void highlight_pointer(const int where)
53{
54 complement_pos(sel_cons, where);
55}
56
57static u16
58sel_pos(int n)
59{
60 return inverse_translate(sel_cons, screen_glyph(sel_cons, n),
61 use_unicode);
62}
63
64/* remove the current selection highlight, if any,
65 from the console holding the selection. */
66void
67clear_selection(void) {
68 highlight_pointer(-1); /* hide the pointer */
69 if (sel_start != -1) {
70 highlight(sel_start, sel_end);
71 sel_start = -1;
72 }
73}
74
75/*
76 * User settable table: what characters are to be considered alphabetic?
77 * 256 bits
78 */
79static u32 inwordLut[8]={
80 0x00000000, /* control chars */
81 0x03FF0000, /* digits */
82 0x87FFFFFE, /* uppercase and '_' */
83 0x07FFFFFE, /* lowercase */
84 0x00000000,
85 0x00000000,
86 0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */
87 0xFF7FFFFF /* latin-1 accented letters, not division sign */
88};
89
90static inline int inword(const u16 c) {
91 return c > 0xff || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
92}
93
94/* set inwordLut contents. Invoked by ioctl(). */
95int sel_loadlut(char __user *p)
96{
97 return copy_from_user(inwordLut, (u32 __user *)(p+4), 32) ? -EFAULT : 0;
98}
99
100/* does screen address p correspond to character at LH/RH edge of screen? */
101static inline int atedge(const int p, int size_row)
102{
103 return (!(p % size_row) || !((p + 2) % size_row));
104}
105
106/* constrain v such that v <= u */
107static inline unsigned short limit(const unsigned short v, const unsigned short u)
108{
109 return (v > u) ? u : v;
110}
111
112/* stores the char in UTF8 and returns the number of bytes used (1-3) */
113static int store_utf8(u16 c, char *p)
114{
115 if (c < 0x80) {
116 /* 0******* */
117 p[0] = c;
118 return 1;
119 } else if (c < 0x800) {
120 /* 110***** 10****** */
121 p[0] = 0xc0 | (c >> 6);
122 p[1] = 0x80 | (c & 0x3f);
123 return 2;
124 } else {
125 /* 1110**** 10****** 10****** */
126 p[0] = 0xe0 | (c >> 12);
127 p[1] = 0x80 | ((c >> 6) & 0x3f);
128 p[2] = 0x80 | (c & 0x3f);
129 return 3;
130 }
131}
132
133/* set the current selection. Invoked by ioctl() or by kernel code. */
134int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty)
135{
136 struct vc_data *vc = vc_cons[fg_console].d;
137 int sel_mode, new_sel_start, new_sel_end, spc;
138 char *bp, *obp;
139 int i, ps, pe, multiplier;
140 u16 c;
141 struct kbd_struct *kbd = kbd_table + fg_console;
142
143 poke_blanked_console();
144
145 { unsigned short xs, ys, xe, ye;
146
147 if (!access_ok(VERIFY_READ, sel, sizeof(*sel)))
148 return -EFAULT;
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);
161
162 if (sel_mode == TIOCL_SELCLEAR) {
163 /* useful for screendump without selection highlights */
164 clear_selection();
165 return 0;
166 }
167
168 if (mouse_reporting() && (sel_mode & TIOCL_SELMOUSEREPORT)) {
169 mouse_report(tty, sel_mode & TIOCL_SELBUTTONMASK, xs, ys);
170 return 0;
171 }
172 }
173
174 if (ps > pe) /* make sel_start <= sel_end */
175 {
176 int tmp = ps;
177 ps = pe;
178 pe = tmp;
179 }
180
181 if (sel_cons != vc_cons[fg_console].d) {
182 clear_selection();
183 sel_cons = vc_cons[fg_console].d;
184 }
185 use_unicode = kbd && kbd->kbdmode == VC_UNICODE;
186
187 switch (sel_mode)
188 {
189 case TIOCL_SELCHAR: /* character-by-character selection */
190 new_sel_start = ps;
191 new_sel_end = pe;
192 break;
193 case TIOCL_SELWORD: /* word-by-word selection */
194 spc = isspace(sel_pos(ps));
195 for (new_sel_start = ps; ; ps -= 2)
196 {
197 if ((spc && !isspace(sel_pos(ps))) ||
198 (!spc && !inword(sel_pos(ps))))
199 break;
200 new_sel_start = ps;
201 if (!(ps % vc->vc_size_row))
202 break;
203 }
204 spc = isspace(sel_pos(pe));
205 for (new_sel_end = pe; ; pe += 2)
206 {
207 if ((spc && !isspace(sel_pos(pe))) ||
208 (!spc && !inword(sel_pos(pe))))
209 break;
210 new_sel_end = pe;
211 if (!((pe + 2) % vc->vc_size_row))
212 break;
213 }
214 break;
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;
219 break;
220 case TIOCL_SELPOINTER:
221 highlight_pointer(pe);
222 return 0;
223 default:
224 return -EINVAL;
225 }
226
227 /* remove the pointer */
228 highlight_pointer(-1);
229
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))
237 break;
238 if (isspace(sel_pos(pe)))
239 new_sel_end = pe;
240 }
241 if (sel_start == -1) /* no current selection */
242 highlight(new_sel_start, new_sel_end);
243 else if (new_sel_start == sel_start)
244 {
245 if (new_sel_end == sel_end) /* no action required */
246 return 0;
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);
251 }
252 else if (new_sel_end == sel_end)
253 {
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);
258 }
259 else /* some other case; start selection from scratch */
260 {
261 clear_selection();
262 highlight(new_sel_start, new_sel_end);
263 }
264 sel_start = new_sel_start;
265 sel_end = new_sel_end;
266
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);
270 if (!bp) {
271 printk(KERN_WARNING "selection: kmalloc() failed\n");
272 clear_selection();
273 return -ENOMEM;
274 }
275 kfree(sel_buffer);
276 sel_buffer = bp;
277
278 obp = bp;
279 for (i = sel_start; i <= sel_end; i += 2) {
280 c = sel_pos(i);
281 if (use_unicode)
282 bp += store_utf8(c, bp);
283 else
284 *bp++ = c;
285 if (!isspace(c))
286 obp = 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. */
290 if (obp != bp) {
291 bp = obp;
292 *bp++ = '\r';
293 }
294 obp = bp;
295 }
296 }
297 sel_buffer_lth = bp - sel_buffer;
298 return 0;
299}
300
301/* Insert the contents of the selection buffer into the
302 * queue of the tty associated with the current console.
303 * Invoked by ioctl().
304 */
305int paste_selection(struct tty_struct *tty)
306{
307 struct vc_data *vc = tty->driver_data;
308 int pasted = 0;
309 unsigned int count;
310 struct tty_ldisc *ld;
311 DECLARE_WAITQUEUE(wait, current);
312
313 /* always called with BTM from vt_ioctl */
314 WARN_ON(!tty_locked());
315
316 console_lock();
317 poke_blanked_console();
318 console_unlock();
319
320 ld = tty_ldisc_ref(tty);
321 if (!ld) {
322 tty_unlock();
323 ld = tty_ldisc_ref_wait(tty);
324 tty_lock();
325 }
326
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)) {
331 schedule();
332 continue;
333 }
334 count = sel_buffer_lth - pasted;
335 count = min(count, tty->receive_room);
336 tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted,
337 NULL, count);
338 pasted += count;
339 }
340 remove_wait_queue(&vc->paste_wait, &wait);
341 __set_current_state(TASK_RUNNING);
342
343 tty_ldisc_deref(ld);
344 return 0;
345}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * This module exports the functions:
4 *
5 * 'int set_selection(struct tiocl_selection __user *, struct tty_struct *)'
6 * 'void clear_selection(void)'
7 * 'int paste_selection(struct tty_struct *)'
8 * 'int sel_loadlut(char __user *)'
9 *
10 * Now that /dev/vcs exists, most of this can disappear again.
11 */
12
13#include <linux/module.h>
14#include <linux/tty.h>
15#include <linux/sched.h>
16#include <linux/mm.h>
17#include <linux/slab.h>
18#include <linux/types.h>
19
20#include <linux/uaccess.h>
21
22#include <linux/kbd_kern.h>
23#include <linux/vt_kern.h>
24#include <linux/consolemap.h>
25#include <linux/selection.h>
26#include <linux/tiocl.h>
27#include <linux/console.h>
28#include <linux/tty_flip.h>
29
30/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
31#define isspace(c) ((c) == ' ')
32
33extern void poke_blanked_console(void);
34
35/* FIXME: all this needs locking */
36/* Variables for selection control. */
37/* Use a dynamic buffer, instead of static (Dec 1994) */
38struct vc_data *sel_cons; /* must not be deallocated */
39static int use_unicode;
40static volatile int sel_start = -1; /* cleared by clear_selection */
41static int sel_end;
42static int sel_buffer_lth;
43static char *sel_buffer;
44
45/* clear_selection, highlight and highlight_pointer can be called
46 from interrupt (via scrollback/front) */
47
48/* set reverse video on characters s-e of console with selection. */
49static inline void highlight(const int s, const int e)
50{
51 invert_screen(sel_cons, s, e-s+2, 1);
52}
53
54/* use complementary color to show the pointer */
55static inline void highlight_pointer(const int where)
56{
57 complement_pos(sel_cons, where);
58}
59
60static u16
61sel_pos(int n)
62{
63 return inverse_translate(sel_cons, screen_glyph(sel_cons, n),
64 use_unicode);
65}
66
67/**
68 * clear_selection - remove current selection
69 *
70 * Remove the current selection highlight, if any from the console
71 * holding the selection. The caller must hold the console lock.
72 */
73void clear_selection(void)
74{
75 highlight_pointer(-1); /* hide the pointer */
76 if (sel_start != -1) {
77 highlight(sel_start, sel_end);
78 sel_start = -1;
79 }
80}
81
82/*
83 * User settable table: what characters are to be considered alphabetic?
84 * 128 bits. Locked by the console lock.
85 */
86static u32 inwordLut[]={
87 0x00000000, /* control chars */
88 0x03FFE000, /* digits and "-./" */
89 0x87FFFFFE, /* uppercase and '_' */
90 0x07FFFFFE, /* lowercase */
91};
92
93static inline int inword(const u16 c) {
94 return c > 0x7f || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
95}
96
97/**
98 * set loadlut - load the LUT table
99 * @p: user table
100 *
101 * Load the LUT table from user space. The caller must hold the console
102 * lock. Make a temporary copy so a partial update doesn't make a mess.
103 */
104int sel_loadlut(char __user *p)
105{
106 u32 tmplut[ARRAY_SIZE(inwordLut)];
107 if (copy_from_user(tmplut, (u32 __user *)(p+4), sizeof(inwordLut)))
108 return -EFAULT;
109 memcpy(inwordLut, tmplut, sizeof(inwordLut));
110 return 0;
111}
112
113/* does screen address p correspond to character at LH/RH edge of screen? */
114static inline int atedge(const int p, int size_row)
115{
116 return (!(p % size_row) || !((p + 2) % size_row));
117}
118
119/* constrain v such that v <= u */
120static inline unsigned short limit(const unsigned short v, const unsigned short u)
121{
122 return (v > u) ? u : v;
123}
124
125/* stores the char in UTF8 and returns the number of bytes used (1-3) */
126static int store_utf8(u16 c, char *p)
127{
128 if (c < 0x80) {
129 /* 0******* */
130 p[0] = c;
131 return 1;
132 } else if (c < 0x800) {
133 /* 110***** 10****** */
134 p[0] = 0xc0 | (c >> 6);
135 p[1] = 0x80 | (c & 0x3f);
136 return 2;
137 } else {
138 /* 1110**** 10****** 10****** */
139 p[0] = 0xe0 | (c >> 12);
140 p[1] = 0x80 | ((c >> 6) & 0x3f);
141 p[2] = 0x80 | (c & 0x3f);
142 return 3;
143 }
144}
145
146/**
147 * set_selection - set the current selection.
148 * @sel: user selection info
149 * @tty: the console tty
150 *
151 * Invoked by the ioctl handle for the vt layer.
152 *
153 * The entire selection process is managed under the console_lock. It's
154 * a lot under the lock but its hardly a performance path
155 */
156int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty)
157{
158 struct vc_data *vc = vc_cons[fg_console].d;
159 int new_sel_start, new_sel_end, spc;
160 struct tiocl_selection v;
161 char *bp, *obp;
162 int i, ps, pe, multiplier;
163 u16 c;
164 int mode;
165
166 poke_blanked_console();
167 if (copy_from_user(&v, sel, sizeof(*sel)))
168 return -EFAULT;
169
170 v.xs = limit(v.xs - 1, vc->vc_cols - 1);
171 v.ys = limit(v.ys - 1, vc->vc_rows - 1);
172 v.xe = limit(v.xe - 1, vc->vc_cols - 1);
173 v.ye = limit(v.ye - 1, vc->vc_rows - 1);
174 ps = v.ys * vc->vc_size_row + (v.xs << 1);
175 pe = v.ye * vc->vc_size_row + (v.xe << 1);
176
177 if (v.sel_mode == TIOCL_SELCLEAR) {
178 /* useful for screendump without selection highlights */
179 clear_selection();
180 return 0;
181 }
182
183 if (mouse_reporting() && (v.sel_mode & TIOCL_SELMOUSEREPORT)) {
184 mouse_report(tty, v.sel_mode & TIOCL_SELBUTTONMASK, v.xs, v.ys);
185 return 0;
186 }
187
188 if (ps > pe) /* make sel_start <= sel_end */
189 swap(ps, pe);
190
191 if (sel_cons != vc_cons[fg_console].d) {
192 clear_selection();
193 sel_cons = vc_cons[fg_console].d;
194 }
195 mode = vt_do_kdgkbmode(fg_console);
196 if (mode == K_UNICODE)
197 use_unicode = 1;
198 else
199 use_unicode = 0;
200
201 switch (v.sel_mode)
202 {
203 case TIOCL_SELCHAR: /* character-by-character selection */
204 new_sel_start = ps;
205 new_sel_end = pe;
206 break;
207 case TIOCL_SELWORD: /* word-by-word selection */
208 spc = isspace(sel_pos(ps));
209 for (new_sel_start = ps; ; ps -= 2)
210 {
211 if ((spc && !isspace(sel_pos(ps))) ||
212 (!spc && !inword(sel_pos(ps))))
213 break;
214 new_sel_start = ps;
215 if (!(ps % vc->vc_size_row))
216 break;
217 }
218 spc = isspace(sel_pos(pe));
219 for (new_sel_end = pe; ; pe += 2)
220 {
221 if ((spc && !isspace(sel_pos(pe))) ||
222 (!spc && !inword(sel_pos(pe))))
223 break;
224 new_sel_end = pe;
225 if (!((pe + 2) % vc->vc_size_row))
226 break;
227 }
228 break;
229 case TIOCL_SELLINE: /* line-by-line selection */
230 new_sel_start = ps - ps % vc->vc_size_row;
231 new_sel_end = pe + vc->vc_size_row
232 - pe % vc->vc_size_row - 2;
233 break;
234 case TIOCL_SELPOINTER:
235 highlight_pointer(pe);
236 return 0;
237 default:
238 return -EINVAL;
239 }
240
241 /* remove the pointer */
242 highlight_pointer(-1);
243
244 /* select to end of line if on trailing space */
245 if (new_sel_end > new_sel_start &&
246 !atedge(new_sel_end, vc->vc_size_row) &&
247 isspace(sel_pos(new_sel_end))) {
248 for (pe = new_sel_end + 2; ; pe += 2)
249 if (!isspace(sel_pos(pe)) ||
250 atedge(pe, vc->vc_size_row))
251 break;
252 if (isspace(sel_pos(pe)))
253 new_sel_end = pe;
254 }
255 if (sel_start == -1) /* no current selection */
256 highlight(new_sel_start, new_sel_end);
257 else if (new_sel_start == sel_start)
258 {
259 if (new_sel_end == sel_end) /* no action required */
260 return 0;
261 else if (new_sel_end > sel_end) /* extend to right */
262 highlight(sel_end + 2, new_sel_end);
263 else /* contract from right */
264 highlight(new_sel_end + 2, sel_end);
265 }
266 else if (new_sel_end == sel_end)
267 {
268 if (new_sel_start < sel_start) /* extend to left */
269 highlight(new_sel_start, sel_start - 2);
270 else /* contract from left */
271 highlight(sel_start, new_sel_start - 2);
272 }
273 else /* some other case; start selection from scratch */
274 {
275 clear_selection();
276 highlight(new_sel_start, new_sel_end);
277 }
278 sel_start = new_sel_start;
279 sel_end = new_sel_end;
280
281 /* Allocate a new buffer before freeing the old one ... */
282 multiplier = use_unicode ? 3 : 1; /* chars can take up to 3 bytes */
283 bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL);
284 if (!bp) {
285 printk(KERN_WARNING "selection: kmalloc() failed\n");
286 clear_selection();
287 return -ENOMEM;
288 }
289 kfree(sel_buffer);
290 sel_buffer = bp;
291
292 obp = bp;
293 for (i = sel_start; i <= sel_end; i += 2) {
294 c = sel_pos(i);
295 if (use_unicode)
296 bp += store_utf8(c, bp);
297 else
298 *bp++ = c;
299 if (!isspace(c))
300 obp = bp;
301 if (! ((i + 2) % vc->vc_size_row)) {
302 /* strip trailing blanks from line and add newline,
303 unless non-space at end of line. */
304 if (obp != bp) {
305 bp = obp;
306 *bp++ = '\r';
307 }
308 obp = bp;
309 }
310 }
311 sel_buffer_lth = bp - sel_buffer;
312 return 0;
313}
314
315/* Insert the contents of the selection buffer into the
316 * queue of the tty associated with the current console.
317 * Invoked by ioctl().
318 *
319 * Locking: called without locks. Calls the ldisc wrongly with
320 * unsafe methods,
321 */
322int paste_selection(struct tty_struct *tty)
323{
324 struct vc_data *vc = tty->driver_data;
325 int pasted = 0;
326 unsigned int count;
327 struct tty_ldisc *ld;
328 DECLARE_WAITQUEUE(wait, current);
329
330 console_lock();
331 poke_blanked_console();
332 console_unlock();
333
334 ld = tty_ldisc_ref_wait(tty);
335 if (!ld)
336 return -EIO; /* ldisc was hung up */
337 tty_buffer_lock_exclusive(&vc->port);
338
339 add_wait_queue(&vc->paste_wait, &wait);
340 while (sel_buffer && sel_buffer_lth > pasted) {
341 set_current_state(TASK_INTERRUPTIBLE);
342 if (tty_throttled(tty)) {
343 schedule();
344 continue;
345 }
346 __set_current_state(TASK_RUNNING);
347 count = sel_buffer_lth - pasted;
348 count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL,
349 count);
350 pasted += count;
351 }
352 remove_wait_queue(&vc->paste_wait, &wait);
353 __set_current_state(TASK_RUNNING);
354
355 tty_buffer_unlock_exclusive(&vc->port);
356 tty_ldisc_deref(ld);
357 return 0;
358}