[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?
 * 256 bits. Locked by the console lock.
 */
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 */
};

static inline int inword(const u16 c) {
	return c > 0xff || (( 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[8];
	if (copy_from_user(tmplut, (u32 __user *)(p+4), 32))
		return -EFAULT;
	memcpy(inwordLut, tmplut, 32);
	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?
5289475d	83	* 256 bits. Locked by the console lock.
1da177e4 LT	84	*/
	85	static 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
759448f4 JE	96	static inline int inword(const u16 c) {
759448f4 JE	97	return c > 0xff \|\| (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
1da177e4 LT	98	}
1da177e4 LT	99
5289475d AC	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	*/
1da177e4 LT	107	int sel_loadlut(char __user *p)
1da177e4 LT	108	{
5289475d AC	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;
1da177e4 LT	114	}
	115
	116	/* does screen address p correspond to character at LH/RH edge of screen? */
	117	static 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 */
	123	static inline unsigned short limit(const unsigned short v, const unsigned short u)
	124	{
	125	return (v > u) ? u : v;
	126	}
	127
759448f4 JE	128	/* stores the char in UTF8 and returns the number of bytes used (1-3) */
	129	static 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
5289475d AC	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	*/
1da177e4 LT	159	int 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;
759448f4 JE	164	int i, ps, pe, multiplier;
759448f4 JE	165	u16 c;
079c9534	166	int mode;
1da177e4 LT	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	}
079c9534 AC	210	mode = vt_do_kdgkbmode(fg_console);
	211	if (mode == K_UNICODE)
	212	use_unicode = 1;
	213	else
	214	use_unicode = 0;
1da177e4 LT	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 ... */
759448f4	297	multiplier = use_unicode ? 3 : 1; /* chars can take up to 3 bytes */
878b8619	298	bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL);
1da177e4 LT	299	if (!bp) {
	300	printk(KERN_WARNING "selection: kmalloc() failed\n");
	301	clear_selection();
	302	return -ENOMEM;
	303	}
735d5661	304	kfree(sel_buffer);
1da177e4 LT	305	sel_buffer = bp;
	306
	307	obp = bp;
	308	for (i = sel_start; i <= sel_end; i += 2) {
759448f4 JE	309	c = sel_pos(i);
	310	if (use_unicode)
	311	bp += store_utf8(c, bp);
	312	else
	313	*bp++ = c;
	314	if (!isspace(c))
1da177e4 LT	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().
906cbe13	333	*
20f62579 AC	334	* Locking: called without locks. Calls the ldisc wrongly with
20f62579 AC	335	* unsafe methods,
1da177e4 LT	336	*/
	337	int paste_selection(struct tty_struct *tty)
	338	{
c9f19e96	339	struct vc_data *vc = tty->driver_data;
33f0f88f AC	340	int pasted = 0;
33f0f88f AC	341	unsigned int count;
1da177e4 LT	342	struct tty_ldisc *ld;
	343	DECLARE_WAITQUEUE(wait, current);
	344
ac751efa	345	console_lock();
1da177e4	346	poke_blanked_console();
ac751efa	347	console_unlock();
1da177e4	348
7ee00fdb	349	ld = tty_ldisc_ref_wait(tty);
e55afd11 PH	350	if (!ld)
e55afd11 PH	351	return -EIO; /* ldisc was hung up */
a7c8d58c	352	tty_buffer_lock_exclusive(&vc->port);
60af22d2	353
1da177e4 LT	354	add_wait_queue(&vc->paste_wait, &wait);
	355	while (sel_buffer && sel_buffer_lth > pasted) {
	356	set_current_state(TASK_INTERRUPTIBLE);
97ef38b8	357	if (tty_throttled(tty)) {
1da177e4 LT	358	schedule();
	359	continue;
	360	}
61e86cc9	361	__set_current_state(TASK_RUNNING);
1da177e4	362	count = sel_buffer_lth - pasted;
24a89d1c PH	363	count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL,
24a89d1c PH	364	count);
1da177e4 LT	365	pasted += count;
	366	}
	367	remove_wait_queue(&vc->paste_wait, &wait);
cc0a8fbb	368	__set_current_state(TASK_RUNNING);
1da177e4	369
a7c8d58c	370	tty_buffer_unlock_exclusive(&vc->port);
1da177e4 LT	371	tty_ldisc_deref(ld);
	372	return 0;
	373	}