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);