[mirror_ubuntu-artful-kernel.git] / drivers / tty / vt / selection.c

/*
 * This module exports the functions:
 *
 *     'int set_selection(struct tiocl_selection __user *, struct tty_struct *)'
 *     'void clear_selection(void)'
 *     'int paste_selection(struct tty_struct *)'
 *     'int sel_loadlut(char __user *)'
 *
 * 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/slab.h>
#include <linux/types.h>

#include <linux/uaccess.h>

#include <linux/kbd_kern.h>
#include <linux/vt_kern.h>
#include <linux/consolemap.h>
#include <linux/selection.h>
#include <linux/tiocl.h>
#include <linux/console.h>
#include <linux/tty_flip.h>

/* 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);

/* FIXME: all this needs locking */
/* Variables for selection control. */
/* Use a dynamic buffer, instead of static (Dec 1994) */
struct vc_data *sel_cons;		/* must not be deallocated */
static int use_unicode;
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. */
static inline void highlight(const int s, const int e)
{
	invert_screen(sel_cons, s, e-s+2, 1);
}

/* use complementary color to show the pointer */
static inline void highlight_pointer(const int where)
{
	complement_pos(sel_cons, where);
}

static u16
sel_pos(int n)
{
	return inverse_translate(sel_cons, screen_glyph(sel_cons, n),
				use_unicode);
}

/**
 *	clear_selection		-	remove current selection
 *
 *	Remove the current selection highlight, if any from the console
 *	holding the selection. The caller must hold the console lock.
 */
void clear_selection(void)
{
	highlight_pointer(-1); /* hide the pointer */
	if (sel_start != -1) {
		highlight(sel_start, sel_end);
		sel_start = -1;
	}
}

/*
 * User settable table: what characters are to be considered alphabetic?
 * 128 bits. Locked by the console lock.
 */
static u32 inwordLut[]={
  0x00000000, /* control chars     */
  0x03FFE000, /* digits and "-./"  */
  0x87FFFFFE, /* uppercase and '_' */
  0x07FFFFFE, /* lowercase         */
};

static inline int inword(const u16 c) {
	return c > 0x7f || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
}

/**
 *	set loadlut		-	load the LUT table
 *	@p: user table
 *
 *	Load the LUT table from user space. The caller must hold the console
 *	lock. Make a temporary copy so a partial update doesn't make a mess.
 */
int sel_loadlut(char __user *p)
{
	u32 tmplut[ARRAY_SIZE(inwordLut)];
	if (copy_from_user(tmplut, (u32 __user *)(p+4), sizeof(inwordLut)))
		return -EFAULT;
	memcpy(inwordLut, tmplut, sizeof(inwordLut));
	return 0;
}

/* does screen address p correspond to character at LH/RH edge of screen? */
static inline int atedge(const int p, int size_row)
{
	return (!(p % size_row)	|| !((p + 2) % size_row));
}

/* constrain v such that v <= u */
static inline unsigned short limit(const unsigned short v, const unsigned short u)
{
	return (v > u) ? u : v;
}

/* stores the char in UTF8 and returns the number of bytes used (1-3) */
static int store_utf8(u16 c, char *p)
{
	if (c < 0x80) {
		/*  0******* */
		p[0] = c;
		return 1;
	} else if (c < 0x800) {
		/* 110***** 10****** */
		p[0] = 0xc0 | (c >> 6);
		p[1] = 0x80 | (c & 0x3f);
		return 2;
    	} else {
		/* 1110**** 10****** 10****** */
		p[0] = 0xe0 | (c >> 12);
		p[1] = 0x80 | ((c >> 6) & 0x3f);
		p[2] = 0x80 | (c & 0x3f);
		return 3;
    	}
}

/**
 *	set_selection		- 	set the current selection.
 *	@sel: user selection info
 *	@tty: the console tty
 *
 *	Invoked by the ioctl handle for the vt layer.
 *
 *	The entire selection process is managed under the console_lock. It's
 *	 a lot under the lock but its hardly a performance path
 */
int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty)
{
	struct vc_data *vc = vc_cons[fg_console].d;
	int sel_mode, new_sel_start, new_sel_end, spc;
	char *bp, *obp;
	int i, ps, pe, multiplier;
	u16 c;
	int mode;

	poke_blanked_console();

	{ unsigned short xs, ys, xe, ye;

	  if (!access_ok(VERIFY_READ, sel, sizeof(*sel)))
		return -EFAULT;
	  __get_user(xs, &sel->xs);
	  __get_user(ys, &sel->ys);
	  __get_user(xe, &sel->xe);
	  __get_user(ye, &sel->ye);
	  __get_user(sel_mode, &sel->sel_mode);
	  xs--; ys--; xe--; ye--;
	  xs = limit(xs, vc->vc_cols - 1);
	  ys = limit(ys, vc->vc_rows - 1);
	  xe = limit(xe, vc->vc_cols - 1);
	  ye = limit(ye, vc->vc_rows - 1);
	  ps = ys * vc->vc_size_row + (xs << 1);
	  pe = ye * vc->vc_size_row + (xe << 1);

	  if (sel_mode == TIOCL_SELCLEAR) {
	      /* useful for screendump without selection highlights */
	      clear_selection();
	      return 0;
	  }

	  if (mouse_reporting() && (sel_mode & TIOCL_SELMOUSEREPORT)) {
	      mouse_report(tty, sel_mode & TIOCL_SELBUTTONMASK, xs, ys);
	      return 0;
	  }
        }

	if (ps > pe)	/* make sel_start <= sel_end */
	{
		int tmp = ps;
		ps = pe;
		pe = tmp;
	}

	if (sel_cons != vc_cons[fg_console].d) {
		clear_selection();
		sel_cons = vc_cons[fg_console].d;
	}
	mode = vt_do_kdgkbmode(fg_console);
	if (mode == K_UNICODE)
		use_unicode = 1;
	else
		use_unicode = 0;

	switch (sel_mode)
	{
		case TIOCL_SELCHAR:	/* character-by-character selection */
			new_sel_start = ps;
			new_sel_end = pe;
			break;
		case TIOCL_SELWORD:	/* word-by-word selection */
			spc = isspace(sel_pos(ps));
			for (new_sel_start = ps; ; ps -= 2)
			{
				if ((spc && !isspace(sel_pos(ps))) ||
				    (!spc && !inword(sel_pos(ps))))
					break;
				new_sel_start = ps;
				if (!(ps % vc->vc_size_row))
					break;
			}
			spc = isspace(sel_pos(pe));
			for (new_sel_end = pe; ; pe += 2)
			{
				if ((spc && !isspace(sel_pos(pe))) ||
				    (!spc && !inword(sel_pos(pe))))
					break;
				new_sel_end = pe;
				if (!((pe + 2) % vc->vc_size_row))
					break;
			}
			break;
		case TIOCL_SELLINE:	/* line-by-line selection */
			new_sel_start = ps - ps % vc->vc_size_row;
			new_sel_end = pe + vc->vc_size_row
				    - pe % vc->vc_size_row - 2;
			break;
		case TIOCL_SELPOINTER:
			highlight_pointer(pe);
			return 0;
		default:
			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, vc->vc_size_row) &&
		isspace(sel_pos(new_sel_end))) {
		for (pe = new_sel_end + 2; ; pe += 2)
			if (!isspace(sel_pos(pe)) ||
			    atedge(pe, vc->vc_size_row))
				break;
		if (isspace(sel_pos(pe)))
			new_sel_end = pe;
	}
	if (sel_start == -1)	/* no current selection */
		highlight(new_sel_start, new_sel_end);
	else if (new_sel_start == sel_start)
	{
		if (new_sel_end == sel_end)	/* no action required */
			return 0;
		else if (new_sel_end > sel_end)	/* extend to right */
			highlight(sel_end + 2, new_sel_end);
		else				/* contract from right */
			highlight(new_sel_end + 2, sel_end);
	}
	else if (new_sel_end == sel_end)
	{
		if (new_sel_start < sel_start)	/* extend to left */
			highlight(new_sel_start, sel_start - 2);
		else				/* contract from left */
			highlight(sel_start, new_sel_start - 2);
	}
	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 ... */
	multiplier = use_unicode ? 3 : 1;  /* chars can take up to 3 bytes */
	bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL);
	if (!bp) {
		printk(KERN_WARNING "selection: kmalloc() failed\n");
		clear_selection();
		return -ENOMEM;
	}
	kfree(sel_buffer);
	sel_buffer = bp;

	obp = bp;
	for (i = sel_start; i <= sel_end; i += 2) {
		c = sel_pos(i);
		if (use_unicode)
			bp += store_utf8(c, bp);
		else
			*bp++ = c;
		if (!isspace(c))
			obp = bp;
		if (! ((i + 2) % vc->vc_size_row)) {
			/* strip trailing blanks from line and add newline,
			   unless non-space at end of line. */
			if (obp != bp) {
				bp = obp;
				*bp++ = '\r';
			}
			obp = bp;
		}
	}
	sel_buffer_lth = bp - sel_buffer;
	return 0;
}

/* Insert the contents of the selection buffer into the
 * queue of the tty associated with the current console.
 * Invoked by ioctl().
 *
 * Locking: called without locks. Calls the ldisc wrongly with
 * unsafe methods,
 */
int paste_selection(struct tty_struct *tty)
{
	struct vc_data *vc = tty->driver_data;
	int	pasted = 0;
	unsigned int count;
	struct  tty_ldisc *ld;
	DECLARE_WAITQUEUE(wait, current);

	console_lock();
	poke_blanked_console();
	console_unlock();

	ld = tty_ldisc_ref_wait(tty);
	if (!ld)
		return -EIO;	/* ldisc was hung up */
	tty_buffer_lock_exclusive(&vc->port);

	add_wait_queue(&vc->paste_wait, &wait);
	while (sel_buffer && sel_buffer_lth > pasted) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (tty_throttled(tty)) {
			schedule();
			continue;
		}
		__set_current_state(TASK_RUNNING);
		count = sel_buffer_lth - pasted;
		count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL,
					      count);
		pasted += count;
	}
	remove_wait_queue(&vc->paste_wait, &wait);
	__set_current_state(TASK_RUNNING);

	tty_buffer_unlock_exclusive(&vc->port);
	tty_ldisc_deref(ld);
	return 0;
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	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
7c0f6ba6	19	#include <linux/uaccess.h>
1da177e4	20
759448f4	21	#include <linux/kbd_kern.h>
1da177e4 LT	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>
a7c8d58c	27	#include <linux/tty_flip.h>
1da177e4 LT	28
	29	/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
	30	#define isspace(c) ((c) == ' ')
	31
	32	extern void poke_blanked_console(void);
	33
079c9534	34	/* FIXME: all this needs locking */
1da177e4 LT	35	/* Variables for selection control. */
1da177e4 LT	36	/* Use a dynamic buffer, instead of static (Dec 1994) */
ca9bda00	37	struct vc_data sel_cons; / must not be deallocated */
759448f4	38	static int use_unicode;
1da177e4 LT	39	static volatile int sel_start = -1; /* cleared by clear_selection */
	40	static int sel_end;
	41	static int sel_buffer_lth;
	42	static 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. */
	48	static 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 */
	54	static inline void highlight_pointer(const int where)
	55	{
	56	complement_pos(sel_cons, where);
	57	}
	58
759448f4	59	static u16
1da177e4 LT	60	sel_pos(int n)
1da177e4 LT	61	{
759448f4 JE	62	return inverse_translate(sel_cons, screen_glyph(sel_cons, n),
759448f4 JE	63	use_unicode);
1da177e4 LT	64	}
1da177e4 LT	65
5289475d AC	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	*/
	72	void clear_selection(void)
	73	{
1da177e4 LT	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?
7f1534e1	83	* 128 bits. Locked by the console lock.
1da177e4	84	*/
7f1534e1	85	static u32 inwordLut[]={
1da177e4	86	0x00000000, /* control chars */
7d6d44ae	87	0x03FFE000, /* digits and "-./" */
1da177e4 LT	88	0x87FFFFFE, /* uppercase and '_' */
1da177e4 LT	89	0x07FFFFFE, /* lowercase */
1da177e4 LT	90	};
1da177e4 LT	91
759448f4	92	static inline int inword(const u16 c) {
7f1534e1	93	return c > 0x7f \|\| (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
1da177e4 LT	94	}
1da177e4 LT	95
5289475d AC	96	/**
	97	* set loadlut - load the LUT table
	98	* @p: user table
	99	*
	100	* Load the LUT table from user space. The caller must hold the console
	101	* lock. Make a temporary copy so a partial update doesn't make a mess.
	102	*/
1da177e4 LT	103	int sel_loadlut(char __user *p)
1da177e4 LT	104	{
7f1534e1 AB	105	u32 tmplut[ARRAY_SIZE(inwordLut)];
7f1534e1 AB	106	if (copy_from_user(tmplut, (u32 __user *)(p+4), sizeof(inwordLut)))
5289475d	107	return -EFAULT;
7f1534e1	108	memcpy(inwordLut, tmplut, sizeof(inwordLut));
5289475d	109	return 0;
1da177e4 LT	110	}
	111
	112	/* does screen address p correspond to character at LH/RH edge of screen? */
	113	static inline int atedge(const int p, int size_row)
	114	{
	115	return (!(p % size_row) \|\| !((p + 2) % size_row));
	116	}
	117
	118	/* constrain v such that v <= u */
	119	static inline unsigned short limit(const unsigned short v, const unsigned short u)
	120	{
	121	return (v > u) ? u : v;
	122	}
	123
759448f4 JE	124	/* stores the char in UTF8 and returns the number of bytes used (1-3) */
	125	static int store_utf8(u16 c, char *p)
	126	{
	127	if (c < 0x80) {
	128	/* 0******* */
	129	p[0] = c;
	130	return 1;
	131	} else if (c < 0x800) {
	132	/* 110*** 10**** */
	133	p[0] = 0xc0 \| (c >> 6);
	134	p[1] = 0x80 \| (c & 0x3f);
	135	return 2;
	136	} else {
	137	/* 1110** 10** 10**** */
	138	p[0] = 0xe0 \| (c >> 12);
	139	p[1] = 0x80 \| ((c >> 6) & 0x3f);
	140	p[2] = 0x80 \| (c & 0x3f);
	141	return 3;
	142	}
	143	}
	144
5289475d AC	145	/**
	146	* set_selection - set the current selection.
	147	* @sel: user selection info
	148	* @tty: the console tty
	149	*
	150	* Invoked by the ioctl handle for the vt layer.
	151	*
	152	* The entire selection process is managed under the console_lock. It's
	153	* a lot under the lock but its hardly a performance path
	154	*/
1da177e4 LT	155	int set_selection(const struct tiocl_selection __user sel, struct tty_struct tty)
	156	{
	157	struct vc_data *vc = vc_cons[fg_console].d;
	158	int sel_mode, new_sel_start, new_sel_end, spc;
	159	char bp, obp;
759448f4 JE	160	int i, ps, pe, multiplier;
759448f4 JE	161	u16 c;
079c9534	162	int mode;
1da177e4 LT	163
	164	poke_blanked_console();
	165
	166	{ unsigned short xs, ys, xe, ye;
	167
	168	if (!access_ok(VERIFY_READ, sel, sizeof(*sel)))
	169	return -EFAULT;
	170	__get_user(xs, &sel->xs);
	171	__get_user(ys, &sel->ys);
	172	__get_user(xe, &sel->xe);
	173	__get_user(ye, &sel->ye);
	174	__get_user(sel_mode, &sel->sel_mode);
	175	xs--; ys--; xe--; ye--;
	176	xs = limit(xs, vc->vc_cols - 1);
	177	ys = limit(ys, vc->vc_rows - 1);
	178	xe = limit(xe, vc->vc_cols - 1);
	179	ye = limit(ye, vc->vc_rows - 1);
	180	ps = ys * vc->vc_size_row + (xs << 1);
	181	pe = ye * vc->vc_size_row + (xe << 1);
	182
	183	if (sel_mode == TIOCL_SELCLEAR) {
	184	/* useful for screendump without selection highlights */
	185	clear_selection();
	186	return 0;
	187	}
	188
	189	if (mouse_reporting() && (sel_mode & TIOCL_SELMOUSEREPORT)) {
	190	mouse_report(tty, sel_mode & TIOCL_SELBUTTONMASK, xs, ys);
	191	return 0;
	192	}
	193	}
	194
	195	if (ps > pe) /* make sel_start <= sel_end */
	196	{
	197	int tmp = ps;
	198	ps = pe;
	199	pe = tmp;
	200	}
	201
	202	if (sel_cons != vc_cons[fg_console].d) {
	203	clear_selection();
	204	sel_cons = vc_cons[fg_console].d;
	205	}
079c9534 AC	206	mode = vt_do_kdgkbmode(fg_console);
	207	if (mode == K_UNICODE)
	208	use_unicode = 1;
	209	else
	210	use_unicode = 0;
1da177e4 LT	211
	212	switch (sel_mode)
	213	{
	214	case TIOCL_SELCHAR: /* character-by-character selection */
	215	new_sel_start = ps;
	216	new_sel_end = pe;
	217	break;
	218	case TIOCL_SELWORD: /* word-by-word selection */
	219	spc = isspace(sel_pos(ps));
	220	for (new_sel_start = ps; ; ps -= 2)
	221	{
	222	if ((spc && !isspace(sel_pos(ps))) \|\|
	223	(!spc && !inword(sel_pos(ps))))
	224	break;
	225	new_sel_start = ps;
	226	if (!(ps % vc->vc_size_row))
	227	break;
	228	}
	229	spc = isspace(sel_pos(pe));
	230	for (new_sel_end = pe; ; pe += 2)
	231	{
	232	if ((spc && !isspace(sel_pos(pe))) \|\|
	233	(!spc && !inword(sel_pos(pe))))
	234	break;
	235	new_sel_end = pe;
	236	if (!((pe + 2) % vc->vc_size_row))
	237	break;
	238	}
	239	break;
	240	case TIOCL_SELLINE: /* line-by-line selection */
	241	new_sel_start = ps - ps % vc->vc_size_row;
	242	new_sel_end = pe + vc->vc_size_row
	243	- pe % vc->vc_size_row - 2;
	244	break;
	245	case TIOCL_SELPOINTER:
	246	highlight_pointer(pe);
	247	return 0;
	248	default:
	249	return -EINVAL;
	250	}
	251
	252	/* remove the pointer */
	253	highlight_pointer(-1);
	254
	255	/* select to end of line if on trailing space */
	256	if (new_sel_end > new_sel_start &&
	257	!atedge(new_sel_end, vc->vc_size_row) &&
	258	isspace(sel_pos(new_sel_end))) {
	259	for (pe = new_sel_end + 2; ; pe += 2)
	260	if (!isspace(sel_pos(pe)) \|\|
	261	atedge(pe, vc->vc_size_row))
	262	break;
	263	if (isspace(sel_pos(pe)))
	264	new_sel_end = pe;
	265	}
	266	if (sel_start == -1) /* no current selection */
	267	highlight(new_sel_start, new_sel_end);
	268	else if (new_sel_start == sel_start)
	269	{
	270	if (new_sel_end == sel_end) /* no action required */
	271	return 0;
	272	else if (new_sel_end > sel_end) /* extend to right */
	273	highlight(sel_end + 2, new_sel_end);
	274	else /* contract from right */
275	highlight(new_sel_end + 2, sel_end);
276	}
277	else if (new_sel_end == sel_end)
278	{
279	if (new_sel_start < sel_start) /* extend to left */
280	highlight(new_sel_start, sel_start - 2);
281	else /* contract from left */
282	highlight(sel_start, new_sel_start - 2);
283	}
284	else /* some other case; start selection from scratch */
285	{
286	clear_selection();
287	highlight(new_sel_start, new_sel_end);
288	}
289	sel_start = new_sel_start;
290	sel_end = new_sel_end;
291
292	/* Allocate a new buffer before freeing the old one ... */
759448f4	293	multiplier = use_unicode ? 3 : 1; /* chars can take up to 3 bytes */
878b8619	294	bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL);
1da177e4 LT	295	if (!bp) {
	296	printk(KERN_WARNING "selection: kmalloc() failed\n");
	297	clear_selection();
	298	return -ENOMEM;
	299	}
735d5661	300	kfree(sel_buffer);
1da177e4 LT	301	sel_buffer = bp;
	302
	303	obp = bp;
	304	for (i = sel_start; i <= sel_end; i += 2) {
759448f4 JE	305	c = sel_pos(i);
	306	if (use_unicode)
	307	bp += store_utf8(c, bp);
	308	else
	309	*bp++ = c;
	310	if (!isspace(c))
1da177e4 LT	311	obp = bp;
	312	if (! ((i + 2) % vc->vc_size_row)) {
	313	/* strip trailing blanks from line and add newline,
	314	unless non-space at end of line. */
	315	if (obp != bp) {
	316	bp = obp;
	317	*bp++ = '\r';
	318	}
	319	obp = bp;
	320	}
	321	}
	322	sel_buffer_lth = bp - sel_buffer;
	323	return 0;
	324	}
	325
	326	/* Insert the contents of the selection buffer into the
	327	* queue of the tty associated with the current console.
	328	* Invoked by ioctl().
906cbe13	329	*
20f62579 AC	330	* Locking: called without locks. Calls the ldisc wrongly with
20f62579 AC	331	* unsafe methods,
1da177e4 LT	332	*/
	333	int paste_selection(struct tty_struct *tty)
	334	{
c9f19e96	335	struct vc_data *vc = tty->driver_data;
33f0f88f AC	336	int pasted = 0;
33f0f88f AC	337	unsigned int count;
1da177e4 LT	338	struct tty_ldisc *ld;
	339	DECLARE_WAITQUEUE(wait, current);
	340
ac751efa	341	console_lock();
1da177e4	342	poke_blanked_console();
ac751efa	343	console_unlock();
1da177e4	344
7ee00fdb	345	ld = tty_ldisc_ref_wait(tty);
e55afd11 PH	346	if (!ld)
e55afd11 PH	347	return -EIO; /* ldisc was hung up */
a7c8d58c	348	tty_buffer_lock_exclusive(&vc->port);
60af22d2	349
1da177e4 LT	350	add_wait_queue(&vc->paste_wait, &wait);
	351	while (sel_buffer && sel_buffer_lth > pasted) {
	352	set_current_state(TASK_INTERRUPTIBLE);
97ef38b8	353	if (tty_throttled(tty)) {
1da177e4 LT	354	schedule();
	355	continue;
	356	}
61e86cc9	357	__set_current_state(TASK_RUNNING);
1da177e4	358	count = sel_buffer_lth - pasted;
24a89d1c PH	359	count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL,
24a89d1c PH	360	count);
1da177e4 LT	361	pasted += count;
	362	}
	363	remove_wait_queue(&vc->paste_wait, &wait);
cc0a8fbb	364	__set_current_state(TASK_RUNNING);
1da177e4	365
a7c8d58c	366	tty_buffer_unlock_exclusive(&vc->port);
1da177e4 LT	367	tty_ldisc_deref(ld);
	368	return 0;
	369	}