/*
* linux/drivers/char/selection.c
*
* This module exports the functions:
*
* 'int set_selection(const unsigned long arg)'
* 'void clear_selection(void)'
* 'int paste_selection(struct tty_struct *tty)'
* 'int sel_loadlut(const unsigned long arg)'
*
* Now that /dev/vcs exists, most of this can disappear again.
*/
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/malloc.h>
#include <linux/types.h>
#include <asm/uaccess.h>
#include <linux/vt_kern.h>
#include <linux/consolemap.h>
#include <linux/console_struct.h>
#include <linux/selection.h>
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
#define isspace(c) ((c) == ' ')
extern void poke_blanked_console(void);
/* Variables for selection control. */
/* Use a dynamic buffer, instead of static (Dec 1994) */
int sel_cons; /* must not be disallocated */
static volatile int sel_start = -1; /* cleared by clear_selection */
static int sel_end;
static int sel_buffer_lth;
static char *sel_buffer;
/* clear_selection, highlight and highlight_pointer can be called
from interrupt (via scrollback/front) */
/* set reverse video on characters s-e of console with selection. */
inline static void
50 highlight(const int s, const int e) {
invert_screen(sel_cons, s, e-s+2, 1);
}
/* use complementary color to show the pointer */
inline static void
56 highlight_pointer(const int where) {
complement_pos(sel_cons, where);
}
static unsigned char
61 sel_pos(int n)
{
63 return inverse_translate(vc_cons[sel_cons].d, screen_glyph(sel_cons, n));
}
/* remove the current selection highlight, if any,
from the console holding the selection. */
void
69 clear_selection(void) {
highlight_pointer(-1); /* hide the pointer */
71 if (sel_start != -1) {
highlight(sel_start, sel_end);
sel_start = -1;
}
}
/*
* User settable table: what characters are to be considered alphabetic?
* 256 bits
*/
static u32 inwordLut[8]={
0x00000000, /* control chars */
0x03FF0000, /* digits */
0x87FFFFFE, /* uppercase and '_' */
0x07FFFFFE, /* lowercase */
0x00000000,
0x00000000,
0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */
0xFF7FFFFF /* latin-1 accented letters, not division sign */
};
92 static inline int inword(const unsigned char c) {
93 return ( inwordLut[c>>5] >> (c & 0x1F) ) & 1;
}
/* set inwordLut contents. Invoked by ioctl(). */
97 int sel_loadlut(const unsigned long arg)
{
int err = -EFAULT;
101 if (!copy_from_user(inwordLut, (u32 *)(arg+4), 32))
err = 0;
103 return err;
}
/* does screen address p correspond to character at LH/RH edge of screen? */
107 static inline int atedge(const int p, int size_row)
{
109 return (!(p % size_row) || !((p + 2) % size_row));
}
/* constrain v such that v <= u */
113 static inline unsigned short limit(const unsigned short v, const unsigned short u)
{
115 return (v > u) ? u : v;
}
/* set the current selection. Invoked by ioctl() or by kernel code. */
119 int set_selection(const unsigned long arg, struct tty_struct *tty, int user)
{
int sel_mode, new_sel_start, new_sel_end, spc;
char *bp, *obp;
int i, ps, pe;
unsigned int currcons = fg_console;
unblank_screen();
poke_blanked_console();
{ unsigned short *args, xs, ys, xe, ye;
args = (unsigned short *)(arg + 1);
132 if (user) {
int err;
err = verify_area(VERIFY_READ, args, sizeof(short) * 5);
135 if (err)
136 return err;
get_user(xs, args++);
get_user(ys, args++);
get_user(xe, args++);
get_user(ye, args++);
get_user(sel_mode, args);
142 } else {
xs = *(args++); /* set selection from kernel */
ys = *(args++);
xe = *(args++);
ye = *(args++);
sel_mode = *args;
}
xs--; ys--; xe--; ye--;
xs = limit(xs, video_num_columns - 1);
ys = limit(ys, video_num_lines - 1);
xe = limit(xe, video_num_columns - 1);
ye = limit(ye, video_num_lines - 1);
ps = ys * video_size_row + (xs << 1);
pe = ye * video_size_row + (xe << 1);
157 if (sel_mode == 4) {
/* useful for screendump without selection highlights */
clear_selection();
160 return 0;
}
163 if (mouse_reporting() && (sel_mode & 16)) {
mouse_report(tty, sel_mode & 15, xs, ys);
165 return 0;
}
}
169 if (ps > pe) /* make sel_start <= sel_end */
{
int tmp = ps;
ps = pe;
pe = tmp;
}
176 if (sel_cons != fg_console) {
clear_selection();
sel_cons = fg_console;
}
181 switch (sel_mode)
{
183 case 0: /* character-by-character selection */
new_sel_start = ps;
new_sel_end = pe;
186 break;
187 case 1: /* word-by-word selection */
spc = isspace(sel_pos(ps));
189 for (new_sel_start = ps; ; ps -= 2)
{
if ((spc && !isspace(sel_pos(ps))) ||
192 (!spc && !inword(sel_pos(ps))))
193 break;
new_sel_start = ps;
195 if (!(ps % video_size_row))
196 break;
}
spc = isspace(sel_pos(pe));
199 for (new_sel_end = pe; ; pe += 2)
{
if ((spc && !isspace(sel_pos(pe))) ||
202 (!spc && !inword(sel_pos(pe))))
203 break;
new_sel_end = pe;
205 if (!((pe + 2) % video_size_row))
206 break;
}
208 break;
209 case 2: /* line-by-line selection */
new_sel_start = ps - ps % video_size_row;
new_sel_end = pe + video_size_row
- pe % video_size_row - 2;
213 break;
214 case 3:
highlight_pointer(pe);
216 return 0;
217 default:
218 return -EINVAL;
}
/* remove the pointer */
highlight_pointer(-1);
/* select to end of line if on trailing space */
if (new_sel_end > new_sel_start &&
!atedge(new_sel_end, video_size_row) &&
227 isspace(sel_pos(new_sel_end))) {
228 for (pe = new_sel_end + 2; ; pe += 2)
if (!isspace(sel_pos(pe)) ||
230 atedge(pe, video_size_row))
231 break;
232 if (isspace(sel_pos(pe)))
new_sel_end = pe;
}
235 if (sel_start == -1) /* no current selection */
highlight(new_sel_start, new_sel_end);
237 else if (new_sel_start == sel_start)
{
239 if (new_sel_end == sel_end) /* no action required */
240 return 0;
241 else if (new_sel_end > sel_end) /* extend to right */
highlight(sel_end + 2, new_sel_end);
243 else /* contract from right */
highlight(new_sel_end + 2, sel_end);
}
246 else if (new_sel_end == sel_end)
{
248 if (new_sel_start < sel_start) /* extend to left */
highlight(new_sel_start, sel_start - 2);
250 else /* contract from left */
highlight(sel_start, new_sel_start - 2);
}
253 else /* some other case; start selection from scratch */
{
clear_selection();
highlight(new_sel_start, new_sel_end);
}
sel_start = new_sel_start;
sel_end = new_sel_end;
/* Allocate a new buffer before freeing the old one ... */
bp = kmalloc((sel_end-sel_start)/2+1, GFP_KERNEL);
263 if (!bp) {
printk(KERN_WARNING "selection: kmalloc() failed\n");
clear_selection();
266 return -ENOMEM;
}
268 if (sel_buffer)
kfree(sel_buffer);
sel_buffer = bp;
obp = bp;
273 for (i = sel_start; i <= sel_end; i += 2) {
*bp = sel_pos(i);
275 if (!isspace(*bp++))
obp = bp;
277 if (! ((i + 2) % video_size_row)) {
/* strip trailing blanks from line and add newline,
unless non-space at end of line. */
280 if (obp != bp) {
bp = obp;
*bp++ = '\r';
}
obp = bp;
}
}
sel_buffer_lth = bp - sel_buffer;
288 return 0;
}
/* Insert the contents of the selection buffer into the
* queue of the tty associated with the current console.
* Invoked by ioctl().
*/
295 int paste_selection(struct tty_struct *tty)
{
struct vt_struct *vt = (struct vt_struct *) tty->driver_data;
int pasted = 0, count;
DECLARE_WAITQUEUE(wait, current);
poke_blanked_console();
add_wait_queue(&vt->paste_wait, &wait);
303 while (sel_buffer && sel_buffer_lth > pasted) {
304 set_current_state(TASK_INTERRUPTIBLE);
305 if (test_bit(TTY_THROTTLED, &tty->flags)) {
schedule();
307 continue;
}
count = sel_buffer_lth - pasted;
count = MIN(count, tty->ldisc.receive_room(tty));
tty->ldisc.receive_buf(tty, sel_buffer + pasted, 0, count);
pasted += count;
}
remove_wait_queue(&vt->paste_wait, &wait);
current->state = TASK_RUNNING;
316 return 0;
}
EXPORT_SYMBOL(set_selection);
EXPORT_SYMBOL(paste_selection);