[linux-2.6-block.git] / drivers / tty / vt / selection.c

// SPDX-License-Identifier: GPL-2.0
/*
 * This module exports the functions:
 *
 *     'int set_selection_user(struct tiocl_selection __user *,
 *			       struct tty_struct *)'
 *     'int set_selection_kernel(struct tiocl_selection *, 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 u32
sel_pos(int n)
{
	if (use_unicode)
		return screen_glyph_unicode(sel_cons, n / 2);
	return inverse_translate(sel_cons, screen_glyph(sel_cons, n),
				0);
}

/**
 *	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;
	}
}
EXPORT_SYMBOL_GPL(clear_selection);

/*
 * 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 u32 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));
}

/* stores the char in UTF8 and returns the number of bytes used (1-4) */
static int store_utf8(u32 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 if (c < 0x10000) {
		/* 1110**** 10****** 10****** */
		p[0] = 0xe0 | (c >> 12);
		p[1] = 0x80 | ((c >> 6) & 0x3f);
		p[2] = 0x80 | (c & 0x3f);
		return 3;
	} else if (c < 0x110000) {
		/* 11110*** 10****** 10****** 10****** */
		p[0] = 0xf0 | (c >> 18);
		p[1] = 0x80 | ((c >> 12) & 0x3f);
		p[2] = 0x80 | ((c >> 6) & 0x3f);
		p[3] = 0x80 | (c & 0x3f);
		return 4;
	} else {
		/* outside Unicode, replace with U+FFFD */
		p[0] = 0xef;
		p[1] = 0xbf;
		p[2] = 0xbd;
		return 3;
	}
}

/**
 *	set_selection_user	-	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_user(const struct tiocl_selection __user *sel,
		       struct tty_struct *tty)
{
	struct tiocl_selection v;

	if (copy_from_user(&v, sel, sizeof(*sel)))
		return -EFAULT;

	return set_selection_kernel(&v, tty);
}

int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty)
{
	struct vc_data *vc = vc_cons[fg_console].d;
	int new_sel_start, new_sel_end, spc;
	char *bp, *obp;
	int i, ps, pe, multiplier;
	u32 c;
	int mode;

	poke_blanked_console();

	v->xs = min_t(u16, v->xs - 1, vc->vc_cols - 1);
	v->ys = min_t(u16, v->ys - 1, vc->vc_rows - 1);
	v->xe = min_t(u16, v->xe - 1, vc->vc_cols - 1);
	v->ye = min_t(u16, v->ye - 1, vc->vc_rows - 1);
	ps = v->ys * vc->vc_size_row + (v->xs << 1);
	pe = v->ye * vc->vc_size_row + (v->xe << 1);

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

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

	if (ps > pe)	/* make sel_start <= sel_end */
		swap(ps, pe);

	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 (v->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 ? 4 : 1;  /* chars can take up to 4 bytes */
	bp = kmalloc_array((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;
}
EXPORT_SYMBOL_GPL(set_selection_kernel);

/* 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;
}
EXPORT_SYMBOL_GPL(paste_selection);
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
1da177e4 LT	3	* This module exports the functions:
1da177e4 LT	4	*
496124e5 OK	5	* 'int set_selection_user(struct tiocl_selection __user *,
	6	* struct tty_struct *)'
	7	* 'int set_selection_kernel(struct tiocl_selection , struct tty_struct )'
1da177e4 LT	8	* 'void clear_selection(void)'
	9	* 'int paste_selection(struct tty_struct *)'
	10	* 'int sel_loadlut(char __user *)'
	11	*
	12	* Now that /dev/vcs exists, most of this can disappear again.
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/tty.h>
	17	#include <linux/sched.h>
	18	#include <linux/mm.h>
	19	#include <linux/slab.h>
	20	#include <linux/types.h>
	21
7c0f6ba6	22	#include <linux/uaccess.h>
1da177e4	23
759448f4	24	#include <linux/kbd_kern.h>
1da177e4 LT	25	#include <linux/vt_kern.h>
	26	#include <linux/consolemap.h>
	27	#include <linux/selection.h>
	28	#include <linux/tiocl.h>
	29	#include <linux/console.h>
a7c8d58c	30	#include <linux/tty_flip.h>
1da177e4 LT	31
	32	/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
	33	#define isspace(c) ((c) == ' ')
	34
	35	extern void poke_blanked_console(void);
	36
079c9534	37	/* FIXME: all this needs locking */
1da177e4 LT	38	/* Variables for selection control. */
1da177e4 LT	39	/* Use a dynamic buffer, instead of static (Dec 1994) */
ca9bda00	40	struct vc_data sel_cons; / must not be deallocated */
759448f4	41	static int use_unicode;
1da177e4 LT	42	static volatile int sel_start = -1; /* cleared by clear_selection */
	43	static int sel_end;
	44	static int sel_buffer_lth;
	45	static char *sel_buffer;
	46
	47	/* clear_selection, highlight and highlight_pointer can be called
	48	from interrupt (via scrollback/front) */
	49
	50	/* set reverse video on characters s-e of console with selection. */
	51	static inline void highlight(const int s, const int e)
	52	{
	53	invert_screen(sel_cons, s, e-s+2, 1);
	54	}
	55
	56	/* use complementary color to show the pointer */
	57	static inline void highlight_pointer(const int where)
	58	{
	59	complement_pos(sel_cons, where);
	60	}
	61
9bfdc261	62	static u32
1da177e4 LT	63	sel_pos(int n)
1da177e4 LT	64	{
9bfdc261 AB	65	if (use_unicode)
9bfdc261 AB	66	return screen_glyph_unicode(sel_cons, n / 2);
759448f4	67	return inverse_translate(sel_cons, screen_glyph(sel_cons, n),
9bfdc261	68	0);
1da177e4 LT	69	}
1da177e4 LT	70
5289475d AC	71	/**
	72	* clear_selection - remove current selection
	73	*
	74	* Remove the current selection highlight, if any from the console
	75	* holding the selection. The caller must hold the console lock.
	76	*/
	77	void clear_selection(void)
	78	{
1da177e4 LT	79	highlight_pointer(-1); /* hide the pointer */
	80	if (sel_start != -1) {
	81	highlight(sel_start, sel_end);
	82	sel_start = -1;
	83	}
	84	}
496124e5	85	EXPORT_SYMBOL_GPL(clear_selection);
1da177e4 LT	86
	87	/*
	88	* User settable table: what characters are to be considered alphabetic?
7f1534e1	89	* 128 bits. Locked by the console lock.
1da177e4	90	*/
7f1534e1	91	static u32 inwordLut[]={
1da177e4	92	0x00000000, /* control chars */
7d6d44ae	93	0x03FFE000, /* digits and "-./" */
1da177e4 LT	94	0x87FFFFFE, /* uppercase and '_' */
1da177e4 LT	95	0x07FFFFFE, /* lowercase */
1da177e4 LT	96	};
1da177e4 LT	97
9bfdc261 AB	98	static inline int inword(const u32 c)
9bfdc261 AB	99	{
7f1534e1	100	return c > 0x7f \|\| (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
1da177e4 LT	101	}
1da177e4 LT	102
5289475d AC	103	/**
	104	* set loadlut - load the LUT table
	105	* @p: user table
	106	*
	107	* Load the LUT table from user space. The caller must hold the console
	108	* lock. Make a temporary copy so a partial update doesn't make a mess.
	109	*/
1da177e4 LT	110	int sel_loadlut(char __user *p)
1da177e4 LT	111	{
7f1534e1 AB	112	u32 tmplut[ARRAY_SIZE(inwordLut)];
7f1534e1 AB	113	if (copy_from_user(tmplut, (u32 __user *)(p+4), sizeof(inwordLut)))
5289475d	114	return -EFAULT;
7f1534e1	115	memcpy(inwordLut, tmplut, sizeof(inwordLut));
5289475d	116	return 0;
1da177e4 LT	117	}
	118
	119	/* does screen address p correspond to character at LH/RH edge of screen? */
	120	static inline int atedge(const int p, int size_row)
	121	{
	122	return (!(p % size_row) \|\| !((p + 2) % size_row));
	123	}
	124
df155d2d AB	125	/* stores the char in UTF8 and returns the number of bytes used (1-4) */
df155d2d AB	126	static int store_utf8(u32 c, char *p)
759448f4 JE	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;
df155d2d	137	} else if (c < 0x10000) {
759448f4 JE	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;
df155d2d AB	143	} else if (c < 0x110000) {
	144	/* 11110* 10** 10** 10**** */
	145	p[0] = 0xf0 \| (c >> 18);
	146	p[1] = 0x80 \| ((c >> 12) & 0x3f);
	147	p[2] = 0x80 \| ((c >> 6) & 0x3f);
	148	p[3] = 0x80 \| (c & 0x3f);
	149	return 4;
	150	} else {
	151	/* outside Unicode, replace with U+FFFD */
	152	p[0] = 0xef;
	153	p[1] = 0xbf;
	154	p[2] = 0xbd;
	155	return 3;
	156	}
759448f4 JE	157	}
759448f4 JE	158
5289475d	159	/**
496124e5	160	* set_selection_user - set the current selection.
5289475d AC	161	* @sel: user selection info
	162	* @tty: the console tty
	163	*
	164	* Invoked by the ioctl handle for the vt layer.
	165	*
	166	* The entire selection process is managed under the console_lock. It's
	167	* a lot under the lock but its hardly a performance path
	168	*/
496124e5 OK	169	int set_selection_user(const struct tiocl_selection __user *sel,
	170	struct tty_struct *tty)
	171	{
	172	struct tiocl_selection v;
	173
	174	if (copy_from_user(&v, sel, sizeof(*sel)))
	175	return -EFAULT;
	176
	177	return set_selection_kernel(&v, tty);
	178	}
	179
	180	int set_selection_kernel(struct tiocl_selection v, struct tty_struct tty)
1da177e4 LT	181	{
1da177e4 LT	182	struct vc_data *vc = vc_cons[fg_console].d;
2a479aa8	183	int new_sel_start, new_sel_end, spc;
1da177e4	184	char bp, obp;
759448f4	185	int i, ps, pe, multiplier;
9bfdc261	186	u32 c;
079c9534	187	int mode;
1da177e4 LT	188
	189	poke_blanked_console();
	190
496124e5 OK	191	v->xs = min_t(u16, v->xs - 1, vc->vc_cols - 1);
	192	v->ys = min_t(u16, v->ys - 1, vc->vc_rows - 1);
	193	v->xe = min_t(u16, v->xe - 1, vc->vc_cols - 1);
	194	v->ye = min_t(u16, v->ye - 1, vc->vc_rows - 1);
	195	ps = v->ys * vc->vc_size_row + (v->xs << 1);
	196	pe = v->ye * vc->vc_size_row + (v->xe << 1);
1da177e4	197
496124e5	198	if (v->sel_mode == TIOCL_SELCLEAR) {
2a479aa8 AV	199	/* useful for screendump without selection highlights */
	200	clear_selection();
	201	return 0;
	202	}
	203
496124e5 OK	204	if (mouse_reporting() && (v->sel_mode & TIOCL_SELMOUSEREPORT)) {
	205	mouse_report(tty, v->sel_mode & TIOCL_SELBUTTONMASK, v->xs,
	206	v->ys);
2a479aa8 AV	207	return 0;
2a479aa8 AV	208	}
1da177e4 LT	209
1da177e4 LT	210	if (ps > pe) /* make sel_start <= sel_end */
df3d9a5b	211	swap(ps, pe);
1da177e4 LT	212
	213	if (sel_cons != vc_cons[fg_console].d) {
	214	clear_selection();
	215	sel_cons = vc_cons[fg_console].d;
	216	}
079c9534 AC	217	mode = vt_do_kdgkbmode(fg_console);
	218	if (mode == K_UNICODE)
	219	use_unicode = 1;
	220	else
	221	use_unicode = 0;
1da177e4	222
496124e5	223	switch (v->sel_mode)
1da177e4 LT	224	{
	225	case TIOCL_SELCHAR: /* character-by-character selection */
	226	new_sel_start = ps;
	227	new_sel_end = pe;
	228	break;
	229	case TIOCL_SELWORD: /* word-by-word selection */
	230	spc = isspace(sel_pos(ps));
	231	for (new_sel_start = ps; ; ps -= 2)
	232	{
	233	if ((spc && !isspace(sel_pos(ps))) \|\|
	234	(!spc && !inword(sel_pos(ps))))
	235	break;
	236	new_sel_start = ps;
	237	if (!(ps % vc->vc_size_row))
	238	break;
	239	}
	240	spc = isspace(sel_pos(pe));
	241	for (new_sel_end = pe; ; pe += 2)
	242	{
	243	if ((spc && !isspace(sel_pos(pe))) \|\|
	244	(!spc && !inword(sel_pos(pe))))
	245	break;
	246	new_sel_end = pe;
	247	if (!((pe + 2) % vc->vc_size_row))
	248	break;
	249	}
	250	break;
	251	case TIOCL_SELLINE: /* line-by-line selection */
	252	new_sel_start = ps - ps % vc->vc_size_row;
	253	new_sel_end = pe + vc->vc_size_row
	254	- pe % vc->vc_size_row - 2;
	255	break;
	256	case TIOCL_SELPOINTER:
	257	highlight_pointer(pe);
	258	return 0;
	259	default:
	260	return -EINVAL;
	261	}
	262
	263	/* remove the pointer */
	264	highlight_pointer(-1);
	265
	266	/* select to end of line if on trailing space */
	267	if (new_sel_end > new_sel_start &&
	268	!atedge(new_sel_end, vc->vc_size_row) &&
	269	isspace(sel_pos(new_sel_end))) {
	270	for (pe = new_sel_end + 2; ; pe += 2)
	271	if (!isspace(sel_pos(pe)) \|\|
	272	atedge(pe, vc->vc_size_row))
	273	break;
	274	if (isspace(sel_pos(pe)))
	275	new_sel_end = pe;
	276	}
	277	if (sel_start == -1) /* no current selection */
	278	highlight(new_sel_start, new_sel_end);
	279	else if (new_sel_start == sel_start)
	280	{
	281	if (new_sel_end == sel_end) /* no action required */
	282	return 0;
	283	else if (new_sel_end > sel_end) /* extend to right */
	284	highlight(sel_end + 2, new_sel_end);
	285	else /* contract from right */
	286	highlight(new_sel_end + 2, sel_end);
	287	}
288	else if (new_sel_end == sel_end)
289	{
290	if (new_sel_start < sel_start) /* extend to left */
291	highlight(new_sel_start, sel_start - 2);
292	else /* contract from left */
293	highlight(sel_start, new_sel_start - 2);
294	}
295	else /* some other case; start selection from scratch */
296	{
297	clear_selection();
298	highlight(new_sel_start, new_sel_end);
299	}
300	sel_start = new_sel_start;
301	sel_end = new_sel_end;
302
303	/* Allocate a new buffer before freeing the old one ... */
df155d2d	304	multiplier = use_unicode ? 4 : 1; /* chars can take up to 4 bytes */
6da2ec56 KC	305	bp = kmalloc_array((sel_end - sel_start) / 2 + 1, multiplier,
6da2ec56 KC	306	GFP_KERNEL);
1da177e4 LT	307	if (!bp) {
	308	printk(KERN_WARNING "selection: kmalloc() failed\n");
	309	clear_selection();
	310	return -ENOMEM;
	311	}
735d5661	312	kfree(sel_buffer);
1da177e4 LT	313	sel_buffer = bp;
	314
	315	obp = bp;
	316	for (i = sel_start; i <= sel_end; i += 2) {
759448f4 JE	317	c = sel_pos(i);
	318	if (use_unicode)
	319	bp += store_utf8(c, bp);
	320	else
	321	*bp++ = c;
	322	if (!isspace(c))
1da177e4 LT	323	obp = bp;
	324	if (! ((i + 2) % vc->vc_size_row)) {
	325	/* strip trailing blanks from line and add newline,
	326	unless non-space at end of line. */
	327	if (obp != bp) {
	328	bp = obp;
	329	*bp++ = '\r';
	330	}
	331	obp = bp;
	332	}
	333	}
	334	sel_buffer_lth = bp - sel_buffer;
	335	return 0;
	336	}
496124e5	337	EXPORT_SYMBOL_GPL(set_selection_kernel);
1da177e4 LT	338
	339	/* Insert the contents of the selection buffer into the
	340	* queue of the tty associated with the current console.
	341	* Invoked by ioctl().
906cbe13	342	*
20f62579 AC	343	* Locking: called without locks. Calls the ldisc wrongly with
20f62579 AC	344	* unsafe methods,
1da177e4 LT	345	*/
	346	int paste_selection(struct tty_struct *tty)
	347	{
c9f19e96	348	struct vc_data *vc = tty->driver_data;
33f0f88f AC	349	int pasted = 0;
33f0f88f AC	350	unsigned int count;
1da177e4 LT	351	struct tty_ldisc *ld;
	352	DECLARE_WAITQUEUE(wait, current);
	353
ac751efa	354	console_lock();
1da177e4	355	poke_blanked_console();
ac751efa	356	console_unlock();
1da177e4	357
7ee00fdb	358	ld = tty_ldisc_ref_wait(tty);
e55afd11 PH	359	if (!ld)
e55afd11 PH	360	return -EIO; /* ldisc was hung up */
a7c8d58c	361	tty_buffer_lock_exclusive(&vc->port);
60af22d2	362
1da177e4 LT	363	add_wait_queue(&vc->paste_wait, &wait);
	364	while (sel_buffer && sel_buffer_lth > pasted) {
	365	set_current_state(TASK_INTERRUPTIBLE);
97ef38b8	366	if (tty_throttled(tty)) {
1da177e4 LT	367	schedule();
	368	continue;
	369	}
61e86cc9	370	__set_current_state(TASK_RUNNING);
1da177e4	371	count = sel_buffer_lth - pasted;
24a89d1c PH	372	count = tty_ldisc_receive_buf(ld, sel_buffer + pasted, NULL,
24a89d1c PH	373	count);
1da177e4 LT	374	pasted += count;
	375	}
	376	remove_wait_queue(&vc->paste_wait, &wait);
cc0a8fbb	377	__set_current_state(TASK_RUNNING);
1da177e4	378
a7c8d58c	379	tty_buffer_unlock_exclusive(&vc->port);
1da177e4 LT	380	tty_ldisc_deref(ld);
	381	return 0;
	382	}
496124e5	383	EXPORT_SYMBOL_GPL(paste_selection);