[people/ms/linux.git] / drivers / char / selection.c

/*
 * linux/drivers/char/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 <asm/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/smp_lock.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);

/* 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);
}

/* remove the current selection highlight, if any,
   from the console holding the selection. */
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
 */
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 inwordLut contents. Invoked by ioctl(). */
int sel_loadlut(char __user *p)
{
	return copy_from_user(inwordLut, (u32 __user *)(p+4), 32) ? -EFAULT : 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 the current selection. Invoked by ioctl() or by kernel code. */
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;
	struct kbd_struct *kbd = kbd_table + fg_console;

	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;
	}
	use_unicode = kbd && kbd->kbdmode == VC_UNICODE;

	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().
 */
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);

	/* always called with BTM from vt_ioctl */
	WARN_ON(!tty_locked());

	acquire_console_sem();
	poke_blanked_console();
	release_console_sem();

	ld = tty_ldisc_ref(tty);
	if (!ld) {
		tty_unlock();
		ld = tty_ldisc_ref_wait(tty);
		tty_lock();
	}

	add_wait_queue(&vc->paste_wait, &wait);
	while (sel_buffer && sel_buffer_lth > pasted) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (test_bit(TTY_THROTTLED, &tty->flags)) {
			schedule();
			continue;
		}
		count = sel_buffer_lth - pasted;
		count = min(count, tty->receive_room);
		tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted,
								NULL, count);
		pasted += count;
	}
	remove_wait_queue(&vc->paste_wait, &wait);
	__set_current_state(TASK_RUNNING);

	tty_ldisc_deref(ld);
	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/char/selection.c
	3	*
	4	* This module exports the functions:
	5	*
	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 *)'
	10	*
	11	* Now that /dev/vcs exists, most of this can disappear again.
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/tty.h>
	16	#include <linux/sched.h>
	17	#include <linux/mm.h>
	18	#include <linux/slab.h>
	19	#include <linux/types.h>
	20
	21	#include <asm/uaccess.h>
	22
759448f4	23	#include <linux/kbd_kern.h>
1da177e4 LT	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>
e33ac1c1	29	#include <linux/smp_lock.h>
1da177e4 LT	30
	31	/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
	32	#define isspace(c) ((c) == ' ')
	33
	34	extern void poke_blanked_console(void);
	35
	36	/* Variables for selection control. */
	37	/* Use a dynamic buffer, instead of static (Dec 1994) */
ca9bda00	38	struct vc_data sel_cons; / must not be deallocated */
759448f4	39	static int use_unicode;
1da177e4 LT	40	static volatile int sel_start = -1; /* cleared by clear_selection */
	41	static int sel_end;
	42	static int sel_buffer_lth;
	43	static char *sel_buffer;
	44
	45	/* clear_selection, highlight and highlight_pointer can be called
	46	from interrupt (via scrollback/front) */
	47
	48	/* set reverse video on characters s-e of console with selection. */
	49	static inline void highlight(const int s, const int e)
	50	{
	51	invert_screen(sel_cons, s, e-s+2, 1);
	52	}
	53
	54	/* use complementary color to show the pointer */
	55	static inline void highlight_pointer(const int where)
	56	{
	57	complement_pos(sel_cons, where);
	58	}
	59
759448f4	60	static u16
1da177e4 LT	61	sel_pos(int n)
1da177e4 LT	62	{
759448f4 JE	63	return inverse_translate(sel_cons, screen_glyph(sel_cons, n),
759448f4 JE	64	use_unicode);
1da177e4 LT	65	}
	66
	67	/* remove the current selection highlight, if any,
	68	from the console holding the selection. */
	69	void
	70	clear_selection(void) {
	71	highlight_pointer(-1); /* hide the pointer */
	72	if (sel_start != -1) {
	73	highlight(sel_start, sel_end);
	74	sel_start = -1;
	75	}
	76	}
	77
	78	/*
	79	* User settable table: what characters are to be considered alphabetic?
	80	* 256 bits
	81	*/
	82	static u32 inwordLut[8]={
	83	0x00000000, /* control chars */
	84	0x03FF0000, /* digits */
	85	0x87FFFFFE, /* uppercase and '_' */
	86	0x07FFFFFE, /* lowercase */
	87	0x00000000,
	88	0x00000000,
	89	0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */
	90	0xFF7FFFFF /* latin-1 accented letters, not division sign */
	91	};
	92
759448f4 JE	93	static inline int inword(const u16 c) {
759448f4 JE	94	return c > 0xff \|\| (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
1da177e4 LT	95	}
	96
	97	/* set inwordLut contents. Invoked by ioctl(). */
	98	int sel_loadlut(char __user *p)
	99	{
	100	return copy_from_user(inwordLut, (u32 __user *)(p+4), 32) ? -EFAULT : 0;
	101	}
	102
	103	/* does screen address p correspond to character at LH/RH edge of screen? */
	104	static inline int atedge(const int p, int size_row)
	105	{
	106	return (!(p % size_row) \|\| !((p + 2) % size_row));
	107	}
	108
	109	/* constrain v such that v <= u */
	110	static inline unsigned short limit(const unsigned short v, const unsigned short u)
	111	{
	112	return (v > u) ? u : v;
	113	}
	114
759448f4 JE	115	/* stores the char in UTF8 and returns the number of bytes used (1-3) */
	116	static int store_utf8(u16 c, char *p)
	117	{
	118	if (c < 0x80) {
	119	/* 0******* */
	120	p[0] = c;
	121	return 1;
	122	} else if (c < 0x800) {
	123	/* 110*** 10**** */
	124	p[0] = 0xc0 \| (c >> 6);
	125	p[1] = 0x80 \| (c & 0x3f);
	126	return 2;
	127	} else {
	128	/* 1110** 10** 10**** */
	129	p[0] = 0xe0 \| (c >> 12);
	130	p[1] = 0x80 \| ((c >> 6) & 0x3f);
	131	p[2] = 0x80 \| (c & 0x3f);
	132	return 3;
	133	}
	134	}
	135
1da177e4 LT	136	/* set the current selection. Invoked by ioctl() or by kernel code. */
	137	int set_selection(const struct tiocl_selection __user sel, struct tty_struct tty)
	138	{
	139	struct vc_data *vc = vc_cons[fg_console].d;
	140	int sel_mode, new_sel_start, new_sel_end, spc;
	141	char bp, obp;
759448f4 JE	142	int i, ps, pe, multiplier;
	143	u16 c;
	144	struct kbd_struct *kbd = kbd_table + fg_console;
1da177e4 LT	145
	146	poke_blanked_console();
	147
	148	{ unsigned short xs, ys, xe, ye;
	149
	150	if (!access_ok(VERIFY_READ, sel, sizeof(*sel)))
	151	return -EFAULT;
	152	__get_user(xs, &sel->xs);
	153	__get_user(ys, &sel->ys);
	154	__get_user(xe, &sel->xe);
	155	__get_user(ye, &sel->ye);
	156	__get_user(sel_mode, &sel->sel_mode);
	157	xs--; ys--; xe--; ye--;
	158	xs = limit(xs, vc->vc_cols - 1);
	159	ys = limit(ys, vc->vc_rows - 1);
	160	xe = limit(xe, vc->vc_cols - 1);
	161	ye = limit(ye, vc->vc_rows - 1);
	162	ps = ys * vc->vc_size_row + (xs << 1);
	163	pe = ye * vc->vc_size_row + (xe << 1);
	164
	165	if (sel_mode == TIOCL_SELCLEAR) {
	166	/* useful for screendump without selection highlights */
	167	clear_selection();
	168	return 0;
	169	}
	170
	171	if (mouse_reporting() && (sel_mode & TIOCL_SELMOUSEREPORT)) {
	172	mouse_report(tty, sel_mode & TIOCL_SELBUTTONMASK, xs, ys);
	173	return 0;
	174	}
	175	}
	176
	177	if (ps > pe) /* make sel_start <= sel_end */
	178	{
	179	int tmp = ps;
	180	ps = pe;
	181	pe = tmp;
	182	}
	183
	184	if (sel_cons != vc_cons[fg_console].d) {
	185	clear_selection();
	186	sel_cons = vc_cons[fg_console].d;
	187	}
759448f4	188	use_unicode = kbd && kbd->kbdmode == VC_UNICODE;
1da177e4 LT	189
	190	switch (sel_mode)
	191	{
	192	case TIOCL_SELCHAR: /* character-by-character selection */
	193	new_sel_start = ps;
	194	new_sel_end = pe;
	195	break;
	196	case TIOCL_SELWORD: /* word-by-word selection */
	197	spc = isspace(sel_pos(ps));
	198	for (new_sel_start = ps; ; ps -= 2)
	199	{
	200	if ((spc && !isspace(sel_pos(ps))) \|\|
	201	(!spc && !inword(sel_pos(ps))))
	202	break;
	203	new_sel_start = ps;
	204	if (!(ps % vc->vc_size_row))
	205	break;
	206	}
	207	spc = isspace(sel_pos(pe));
	208	for (new_sel_end = pe; ; pe += 2)
	209	{
	210	if ((spc && !isspace(sel_pos(pe))) \|\|
	211	(!spc && !inword(sel_pos(pe))))
	212	break;
	213	new_sel_end = pe;
	214	if (!((pe + 2) % vc->vc_size_row))
	215	break;
	216	}
	217	break;
	218	case TIOCL_SELLINE: /* line-by-line selection */
	219	new_sel_start = ps - ps % vc->vc_size_row;
	220	new_sel_end = pe + vc->vc_size_row
	221	- pe % vc->vc_size_row - 2;
	222	break;
	223	case TIOCL_SELPOINTER:
	224	highlight_pointer(pe);
	225	return 0;
	226	default:
	227	return -EINVAL;
	228	}
	229
	230	/* remove the pointer */
	231	highlight_pointer(-1);
	232
	233	/* select to end of line if on trailing space */
	234	if (new_sel_end > new_sel_start &&
	235	!atedge(new_sel_end, vc->vc_size_row) &&
	236	isspace(sel_pos(new_sel_end))) {
	237	for (pe = new_sel_end + 2; ; pe += 2)
	238	if (!isspace(sel_pos(pe)) \|\|
	239	atedge(pe, vc->vc_size_row))
	240	break;
	241	if (isspace(sel_pos(pe)))
	242	new_sel_end = pe;
	243	}
	244	if (sel_start == -1) /* no current selection */
	245	highlight(new_sel_start, new_sel_end);
	246	else if (new_sel_start == sel_start)
	247	{
	248	if (new_sel_end == sel_end) /* no action required */
	249	return 0;
	250	else if (new_sel_end > sel_end) /* extend to right */
	251	highlight(sel_end + 2, new_sel_end);
	252	else /* contract from right */
253	highlight(new_sel_end + 2, sel_end);
254	}
255	else if (new_sel_end == sel_end)
256	{
257	if (new_sel_start < sel_start) /* extend to left */
258	highlight(new_sel_start, sel_start - 2);
259	else /* contract from left */
260	highlight(sel_start, new_sel_start - 2);
261	}
262	else /* some other case; start selection from scratch */
263	{
264	clear_selection();
265	highlight(new_sel_start, new_sel_end);
266	}
267	sel_start = new_sel_start;
268	sel_end = new_sel_end;
269
270	/* Allocate a new buffer before freeing the old one ... */
759448f4	271	multiplier = use_unicode ? 3 : 1; /* chars can take up to 3 bytes */
878b8619	272	bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL);
1da177e4 LT	273	if (!bp) {
	274	printk(KERN_WARNING "selection: kmalloc() failed\n");
	275	clear_selection();
	276	return -ENOMEM;
	277	}
735d5661	278	kfree(sel_buffer);
1da177e4 LT	279	sel_buffer = bp;
	280
	281	obp = bp;
	282	for (i = sel_start; i <= sel_end; i += 2) {
759448f4 JE	283	c = sel_pos(i);
	284	if (use_unicode)
	285	bp += store_utf8(c, bp);
	286	else
	287	*bp++ = c;
	288	if (!isspace(c))
1da177e4 LT	289	obp = bp;
	290	if (! ((i + 2) % vc->vc_size_row)) {
	291	/* strip trailing blanks from line and add newline,
	292	unless non-space at end of line. */
	293	if (obp != bp) {
	294	bp = obp;
	295	*bp++ = '\r';
	296	}
	297	obp = bp;
	298	}
	299	}
	300	sel_buffer_lth = bp - sel_buffer;
	301	return 0;
	302	}
	303
	304	/* Insert the contents of the selection buffer into the
	305	* queue of the tty associated with the current console.
	306	* Invoked by ioctl().
	307	*/
	308	int paste_selection(struct tty_struct *tty)
	309	{
c9f19e96	310	struct vc_data *vc = tty->driver_data;
33f0f88f AC	311	int pasted = 0;
33f0f88f AC	312	unsigned int count;
1da177e4 LT	313	struct tty_ldisc *ld;
	314	DECLARE_WAITQUEUE(wait, current);
	315
ddcd9fb6 AB	316	/* always called with BTM from vt_ioctl */
ddcd9fb6 AB	317	WARN_ON(!tty_locked());
e33ac1c1	318
1da177e4 LT	319	acquire_console_sem();
	320	poke_blanked_console();
	321	release_console_sem();
	322
60af22d2 AB	323	ld = tty_ldisc_ref(tty);
	324	if (!ld) {
	325	tty_unlock();
	326	ld = tty_ldisc_ref_wait(tty);
	327	tty_lock();
	328	}
	329
1da177e4 LT	330	add_wait_queue(&vc->paste_wait, &wait);
	331	while (sel_buffer && sel_buffer_lth > pasted) {
	332	set_current_state(TASK_INTERRUPTIBLE);
	333	if (test_bit(TTY_THROTTLED, &tty->flags)) {
	334	schedule();
	335	continue;
	336	}
	337	count = sel_buffer_lth - pasted;
33f0f88f	338	count = min(count, tty->receive_room);
c65c9bc3	339	tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted,
a352def2	340	NULL, count);
1da177e4 LT	341	pasted += count;
	342	}
	343	remove_wait_queue(&vc->paste_wait, &wait);
cc0a8fbb	344	__set_current_state(TASK_RUNNING);
1da177e4 LT	345
	346	tty_ldisc_deref(ld);
	347	return 0;
	348	}