[linux-2.6-block.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>

/* 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*multiplier+1, 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 = (struct vc_data *)tty->driver_data;
	int	pasted = 0;
	unsigned int count;
	struct  tty_ldisc *ld;
	DECLARE_WAITQUEUE(wait, current);

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

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