xref: /openbmc/linux/drivers/tty/vt/selection.c (revision b8209f694f7f4256181deea92d30eedb908d6788)
1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
260d4ae8dSGreg Kroah-Hartman /*
360d4ae8dSGreg Kroah-Hartman  * This module exports the functions:
460d4ae8dSGreg Kroah-Hartman  *
5496124e5SOkash Khawaja  *     'int set_selection_user(struct tiocl_selection __user *,
6496124e5SOkash Khawaja  *			       struct tty_struct *)'
7496124e5SOkash Khawaja  *     'int set_selection_kernel(struct tiocl_selection *, struct tty_struct *)'
860d4ae8dSGreg Kroah-Hartman  *     'void clear_selection(void)'
960d4ae8dSGreg Kroah-Hartman  *     'int paste_selection(struct tty_struct *)'
1060d4ae8dSGreg Kroah-Hartman  *     'int sel_loadlut(char __user *)'
1160d4ae8dSGreg Kroah-Hartman  *
1260d4ae8dSGreg Kroah-Hartman  * Now that /dev/vcs exists, most of this can disappear again.
1360d4ae8dSGreg Kroah-Hartman  */
1460d4ae8dSGreg Kroah-Hartman 
1560d4ae8dSGreg Kroah-Hartman #include <linux/module.h>
1660d4ae8dSGreg Kroah-Hartman #include <linux/tty.h>
1760d4ae8dSGreg Kroah-Hartman #include <linux/sched.h>
1860d4ae8dSGreg Kroah-Hartman #include <linux/mm.h>
1907e6124aSJiri Slaby #include <linux/mutex.h>
2060d4ae8dSGreg Kroah-Hartman #include <linux/slab.h>
2160d4ae8dSGreg Kroah-Hartman #include <linux/types.h>
2260d4ae8dSGreg Kroah-Hartman 
237c0f6ba6SLinus Torvalds #include <linux/uaccess.h>
2460d4ae8dSGreg Kroah-Hartman 
2560d4ae8dSGreg Kroah-Hartman #include <linux/kbd_kern.h>
2660d4ae8dSGreg Kroah-Hartman #include <linux/vt_kern.h>
2760d4ae8dSGreg Kroah-Hartman #include <linux/consolemap.h>
2860d4ae8dSGreg Kroah-Hartman #include <linux/selection.h>
2960d4ae8dSGreg Kroah-Hartman #include <linux/tiocl.h>
3060d4ae8dSGreg Kroah-Hartman #include <linux/console.h>
31a7c8d58cSPeter Hurley #include <linux/tty_flip.h>
3260d4ae8dSGreg Kroah-Hartman 
33687bff0cSJiri Slaby #include <linux/sched/signal.h>
34687bff0cSJiri Slaby 
3560d4ae8dSGreg Kroah-Hartman /* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
3660d4ae8dSGreg Kroah-Hartman #define isspace(c)	((c) == ' ')
3760d4ae8dSGreg Kroah-Hartman 
38079c9534SAlan Cox /* FIXME: all this needs locking */
399256d09fSJiri Slaby static struct vc_selection {
409256d09fSJiri Slaby 	struct mutex lock;
419256d09fSJiri Slaby 	struct vc_data *cons;			/* must not be deallocated */
429256d09fSJiri Slaby 	char *buffer;
439256d09fSJiri Slaby 	unsigned int buf_len;
449256d09fSJiri Slaby 	volatile int start;			/* cleared by clear_selection */
459256d09fSJiri Slaby 	int end;
469256d09fSJiri Slaby } vc_sel = {
479256d09fSJiri Slaby 	.lock = __MUTEX_INITIALIZER(vc_sel.lock),
489256d09fSJiri Slaby 	.start = -1,
499256d09fSJiri Slaby };
5060d4ae8dSGreg Kroah-Hartman 
5160d4ae8dSGreg Kroah-Hartman /* clear_selection, highlight and highlight_pointer can be called
5260d4ae8dSGreg Kroah-Hartman    from interrupt (via scrollback/front) */
5360d4ae8dSGreg Kroah-Hartman 
5460d4ae8dSGreg Kroah-Hartman /* set reverse video on characters s-e of console with selection. */
5560d4ae8dSGreg Kroah-Hartman static inline void highlight(const int s, const int e)
5660d4ae8dSGreg Kroah-Hartman {
57*b8209f69SJiri Slaby 	invert_screen(vc_sel.cons, s, e-s+2, true);
5860d4ae8dSGreg Kroah-Hartman }
5960d4ae8dSGreg Kroah-Hartman 
6060d4ae8dSGreg Kroah-Hartman /* use complementary color to show the pointer */
6160d4ae8dSGreg Kroah-Hartman static inline void highlight_pointer(const int where)
6260d4ae8dSGreg Kroah-Hartman {
639256d09fSJiri Slaby 	complement_pos(vc_sel.cons, where);
6460d4ae8dSGreg Kroah-Hartman }
6560d4ae8dSGreg Kroah-Hartman 
669bfdc261SAdam Borowski static u32
67555b4ef7SJiri Slaby sel_pos(int n, bool unicode)
6860d4ae8dSGreg Kroah-Hartman {
69555b4ef7SJiri Slaby 	if (unicode)
709256d09fSJiri Slaby 		return screen_glyph_unicode(vc_sel.cons, n / 2);
719256d09fSJiri Slaby 	return inverse_translate(vc_sel.cons, screen_glyph(vc_sel.cons, n), 0);
7260d4ae8dSGreg Kroah-Hartman }
7360d4ae8dSGreg Kroah-Hartman 
745289475dSAlan Cox /**
755289475dSAlan Cox  *	clear_selection		-	remove current selection
765289475dSAlan Cox  *
775289475dSAlan Cox  *	Remove the current selection highlight, if any from the console
785289475dSAlan Cox  *	holding the selection. The caller must hold the console lock.
795289475dSAlan Cox  */
805289475dSAlan Cox void clear_selection(void)
815289475dSAlan Cox {
8260d4ae8dSGreg Kroah-Hartman 	highlight_pointer(-1); /* hide the pointer */
839256d09fSJiri Slaby 	if (vc_sel.start != -1) {
849256d09fSJiri Slaby 		highlight(vc_sel.start, vc_sel.end);
859256d09fSJiri Slaby 		vc_sel.start = -1;
8660d4ae8dSGreg Kroah-Hartman 	}
8760d4ae8dSGreg Kroah-Hartman }
88496124e5SOkash Khawaja EXPORT_SYMBOL_GPL(clear_selection);
8960d4ae8dSGreg Kroah-Hartman 
90dce05aa6SJiri Slaby bool vc_is_sel(struct vc_data *vc)
91dce05aa6SJiri Slaby {
929256d09fSJiri Slaby 	return vc == vc_sel.cons;
93dce05aa6SJiri Slaby }
94dce05aa6SJiri Slaby 
9560d4ae8dSGreg Kroah-Hartman /*
9660d4ae8dSGreg Kroah-Hartman  * User settable table: what characters are to be considered alphabetic?
977f1534e1SAdam Borowski  * 128 bits. Locked by the console lock.
9860d4ae8dSGreg Kroah-Hartman  */
997f1534e1SAdam Borowski static u32 inwordLut[]={
10060d4ae8dSGreg Kroah-Hartman   0x00000000, /* control chars     */
1017d6d44aeSAdam Borowski   0x03FFE000, /* digits and "-./"  */
10260d4ae8dSGreg Kroah-Hartman   0x87FFFFFE, /* uppercase and '_' */
10360d4ae8dSGreg Kroah-Hartman   0x07FFFFFE, /* lowercase         */
10460d4ae8dSGreg Kroah-Hartman };
10560d4ae8dSGreg Kroah-Hartman 
1069bfdc261SAdam Borowski static inline int inword(const u32 c)
1079bfdc261SAdam Borowski {
1087f1534e1SAdam Borowski 	return c > 0x7f || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
10960d4ae8dSGreg Kroah-Hartman }
11060d4ae8dSGreg Kroah-Hartman 
1115289475dSAlan Cox /**
1125289475dSAlan Cox  *	set loadlut		-	load the LUT table
1135289475dSAlan Cox  *	@p: user table
1145289475dSAlan Cox  *
1155289475dSAlan Cox  *	Load the LUT table from user space. The caller must hold the console
1165289475dSAlan Cox  *	lock. Make a temporary copy so a partial update doesn't make a mess.
1175289475dSAlan Cox  */
11860d4ae8dSGreg Kroah-Hartman int sel_loadlut(char __user *p)
11960d4ae8dSGreg Kroah-Hartman {
1207f1534e1SAdam Borowski 	u32 tmplut[ARRAY_SIZE(inwordLut)];
1217f1534e1SAdam Borowski 	if (copy_from_user(tmplut, (u32 __user *)(p+4), sizeof(inwordLut)))
1225289475dSAlan Cox 		return -EFAULT;
1237f1534e1SAdam Borowski 	memcpy(inwordLut, tmplut, sizeof(inwordLut));
1245289475dSAlan Cox 	return 0;
12560d4ae8dSGreg Kroah-Hartman }
12660d4ae8dSGreg Kroah-Hartman 
12760d4ae8dSGreg Kroah-Hartman /* does screen address p correspond to character at LH/RH edge of screen? */
12860d4ae8dSGreg Kroah-Hartman static inline int atedge(const int p, int size_row)
12960d4ae8dSGreg Kroah-Hartman {
13060d4ae8dSGreg Kroah-Hartman 	return (!(p % size_row)	|| !((p + 2) % size_row));
13160d4ae8dSGreg Kroah-Hartman }
13260d4ae8dSGreg Kroah-Hartman 
133df155d2dSAdam Borowski /* stores the char in UTF8 and returns the number of bytes used (1-4) */
134df155d2dSAdam Borowski static int store_utf8(u32 c, char *p)
13560d4ae8dSGreg Kroah-Hartman {
13660d4ae8dSGreg Kroah-Hartman 	if (c < 0x80) {
13760d4ae8dSGreg Kroah-Hartman 		/*  0******* */
13860d4ae8dSGreg Kroah-Hartman 		p[0] = c;
13960d4ae8dSGreg Kroah-Hartman 		return 1;
14060d4ae8dSGreg Kroah-Hartman 	} else if (c < 0x800) {
14160d4ae8dSGreg Kroah-Hartman 		/* 110***** 10****** */
14260d4ae8dSGreg Kroah-Hartman 		p[0] = 0xc0 | (c >> 6);
14360d4ae8dSGreg Kroah-Hartman 		p[1] = 0x80 | (c & 0x3f);
14460d4ae8dSGreg Kroah-Hartman 		return 2;
145df155d2dSAdam Borowski 	} else if (c < 0x10000) {
14660d4ae8dSGreg Kroah-Hartman 		/* 1110**** 10****** 10****** */
14760d4ae8dSGreg Kroah-Hartman 		p[0] = 0xe0 | (c >> 12);
14860d4ae8dSGreg Kroah-Hartman 		p[1] = 0x80 | ((c >> 6) & 0x3f);
14960d4ae8dSGreg Kroah-Hartman 		p[2] = 0x80 | (c & 0x3f);
15060d4ae8dSGreg Kroah-Hartman 		return 3;
151df155d2dSAdam Borowski 	} else if (c < 0x110000) {
152df155d2dSAdam Borowski 		/* 11110*** 10****** 10****** 10****** */
153df155d2dSAdam Borowski 		p[0] = 0xf0 | (c >> 18);
154df155d2dSAdam Borowski 		p[1] = 0x80 | ((c >> 12) & 0x3f);
155df155d2dSAdam Borowski 		p[2] = 0x80 | ((c >> 6) & 0x3f);
156df155d2dSAdam Borowski 		p[3] = 0x80 | (c & 0x3f);
157df155d2dSAdam Borowski 		return 4;
158df155d2dSAdam Borowski 	} else {
159df155d2dSAdam Borowski 		/* outside Unicode, replace with U+FFFD */
160df155d2dSAdam Borowski 		p[0] = 0xef;
161df155d2dSAdam Borowski 		p[1] = 0xbf;
162df155d2dSAdam Borowski 		p[2] = 0xbd;
163df155d2dSAdam Borowski 		return 3;
16460d4ae8dSGreg Kroah-Hartman 	}
16560d4ae8dSGreg Kroah-Hartman }
16660d4ae8dSGreg Kroah-Hartman 
1675289475dSAlan Cox /**
168496124e5SOkash Khawaja  *	set_selection_user	-	set the current selection.
1695289475dSAlan Cox  *	@sel: user selection info
1705289475dSAlan Cox  *	@tty: the console tty
1715289475dSAlan Cox  *
1725289475dSAlan Cox  *	Invoked by the ioctl handle for the vt layer.
1735289475dSAlan Cox  *
1745289475dSAlan Cox  *	The entire selection process is managed under the console_lock. It's
1755289475dSAlan Cox  *	 a lot under the lock but its hardly a performance path
1765289475dSAlan Cox  */
177496124e5SOkash Khawaja int set_selection_user(const struct tiocl_selection __user *sel,
178496124e5SOkash Khawaja 		       struct tty_struct *tty)
179496124e5SOkash Khawaja {
180496124e5SOkash Khawaja 	struct tiocl_selection v;
181496124e5SOkash Khawaja 
182496124e5SOkash Khawaja 	if (copy_from_user(&v, sel, sizeof(*sel)))
183496124e5SOkash Khawaja 		return -EFAULT;
184496124e5SOkash Khawaja 
185496124e5SOkash Khawaja 	return set_selection_kernel(&v, tty);
186496124e5SOkash Khawaja }
187496124e5SOkash Khawaja 
1888fd31e69SJiri Slaby static int vc_selection_store_chars(struct vc_data *vc, bool unicode)
1898fd31e69SJiri Slaby {
1908fd31e69SJiri Slaby 	char *bp, *obp;
1918fd31e69SJiri Slaby 	unsigned int i;
1928fd31e69SJiri Slaby 
1938fd31e69SJiri Slaby 	/* Allocate a new buffer before freeing the old one ... */
1948fd31e69SJiri Slaby 	/* chars can take up to 4 bytes with unicode */
1958fd31e69SJiri Slaby 	bp = kmalloc_array((vc_sel.end - vc_sel.start) / 2 + 1, unicode ? 4 : 1,
19644c413d9SAlexey Kardashevskiy 			   GFP_KERNEL | __GFP_NOWARN);
1978fd31e69SJiri Slaby 	if (!bp) {
1988fd31e69SJiri Slaby 		printk(KERN_WARNING "selection: kmalloc() failed\n");
1998fd31e69SJiri Slaby 		clear_selection();
2008fd31e69SJiri Slaby 		return -ENOMEM;
2018fd31e69SJiri Slaby 	}
2028fd31e69SJiri Slaby 	kfree(vc_sel.buffer);
2038fd31e69SJiri Slaby 	vc_sel.buffer = bp;
2048fd31e69SJiri Slaby 
2058fd31e69SJiri Slaby 	obp = bp;
2068fd31e69SJiri Slaby 	for (i = vc_sel.start; i <= vc_sel.end; i += 2) {
2078fd31e69SJiri Slaby 		u32 c = sel_pos(i, unicode);
2088fd31e69SJiri Slaby 		if (unicode)
2098fd31e69SJiri Slaby 			bp += store_utf8(c, bp);
2108fd31e69SJiri Slaby 		else
2118fd31e69SJiri Slaby 			*bp++ = c;
2128fd31e69SJiri Slaby 		if (!isspace(c))
2138fd31e69SJiri Slaby 			obp = bp;
2148fd31e69SJiri Slaby 		if (!((i + 2) % vc->vc_size_row)) {
2158fd31e69SJiri Slaby 			/* strip trailing blanks from line and add newline,
2168fd31e69SJiri Slaby 			   unless non-space at end of line. */
2178fd31e69SJiri Slaby 			if (obp != bp) {
2188fd31e69SJiri Slaby 				bp = obp;
2198fd31e69SJiri Slaby 				*bp++ = '\r';
2208fd31e69SJiri Slaby 			}
2218fd31e69SJiri Slaby 			obp = bp;
2228fd31e69SJiri Slaby 		}
2238fd31e69SJiri Slaby 	}
2248fd31e69SJiri Slaby 	vc_sel.buf_len = bp - vc_sel.buffer;
2258fd31e69SJiri Slaby 
2268fd31e69SJiri Slaby 	return 0;
2278fd31e69SJiri Slaby }
2288fd31e69SJiri Slaby 
2299ba4ddbcSJiri Slaby static int vc_do_selection(struct vc_data *vc, unsigned short mode, int ps,
2309ba4ddbcSJiri Slaby 		int pe)
23160d4ae8dSGreg Kroah-Hartman {
2322a479aa8SAl Viro 	int new_sel_start, new_sel_end, spc;
2339ba4ddbcSJiri Slaby 	bool unicode = vt_do_kdgkbmode(fg_console) == K_UNICODE;
23460d4ae8dSGreg Kroah-Hartman 
2359ba4ddbcSJiri Slaby 	switch (mode) {
23660d4ae8dSGreg Kroah-Hartman 	case TIOCL_SELCHAR:	/* character-by-character selection */
23760d4ae8dSGreg Kroah-Hartman 		new_sel_start = ps;
23860d4ae8dSGreg Kroah-Hartman 		new_sel_end = pe;
23960d4ae8dSGreg Kroah-Hartman 		break;
24060d4ae8dSGreg Kroah-Hartman 	case TIOCL_SELWORD:	/* word-by-word selection */
241555b4ef7SJiri Slaby 		spc = isspace(sel_pos(ps, unicode));
242bc80932cSJiri Slaby 		for (new_sel_start = ps; ; ps -= 2) {
243555b4ef7SJiri Slaby 			if ((spc && !isspace(sel_pos(ps, unicode))) ||
244555b4ef7SJiri Slaby 			    (!spc && !inword(sel_pos(ps, unicode))))
24560d4ae8dSGreg Kroah-Hartman 				break;
24660d4ae8dSGreg Kroah-Hartman 			new_sel_start = ps;
24760d4ae8dSGreg Kroah-Hartman 			if (!(ps % vc->vc_size_row))
24860d4ae8dSGreg Kroah-Hartman 				break;
24960d4ae8dSGreg Kroah-Hartman 		}
250bc80932cSJiri Slaby 
251555b4ef7SJiri Slaby 		spc = isspace(sel_pos(pe, unicode));
252bc80932cSJiri Slaby 		for (new_sel_end = pe; ; pe += 2) {
253555b4ef7SJiri Slaby 			if ((spc && !isspace(sel_pos(pe, unicode))) ||
254555b4ef7SJiri Slaby 			    (!spc && !inword(sel_pos(pe, unicode))))
25560d4ae8dSGreg Kroah-Hartman 				break;
25660d4ae8dSGreg Kroah-Hartman 			new_sel_end = pe;
25760d4ae8dSGreg Kroah-Hartman 			if (!((pe + 2) % vc->vc_size_row))
25860d4ae8dSGreg Kroah-Hartman 				break;
25960d4ae8dSGreg Kroah-Hartman 		}
26060d4ae8dSGreg Kroah-Hartman 		break;
26160d4ae8dSGreg Kroah-Hartman 	case TIOCL_SELLINE:	/* line-by-line selection */
262f0e8e3daSJiri Slaby 		new_sel_start = rounddown(ps, vc->vc_size_row);
263f0e8e3daSJiri Slaby 		new_sel_end = rounddown(pe, vc->vc_size_row) +
264f0e8e3daSJiri Slaby 			vc->vc_size_row - 2;
26560d4ae8dSGreg Kroah-Hartman 		break;
26660d4ae8dSGreg Kroah-Hartman 	case TIOCL_SELPOINTER:
26760d4ae8dSGreg Kroah-Hartman 		highlight_pointer(pe);
268e8c75a30SJiri Slaby 		return 0;
26960d4ae8dSGreg Kroah-Hartman 	default:
270e8c75a30SJiri Slaby 		return -EINVAL;
27160d4ae8dSGreg Kroah-Hartman 	}
27260d4ae8dSGreg Kroah-Hartman 
27360d4ae8dSGreg Kroah-Hartman 	/* remove the pointer */
27460d4ae8dSGreg Kroah-Hartman 	highlight_pointer(-1);
27560d4ae8dSGreg Kroah-Hartman 
27660d4ae8dSGreg Kroah-Hartman 	/* select to end of line if on trailing space */
27760d4ae8dSGreg Kroah-Hartman 	if (new_sel_end > new_sel_start &&
27860d4ae8dSGreg Kroah-Hartman 		!atedge(new_sel_end, vc->vc_size_row) &&
279555b4ef7SJiri Slaby 		isspace(sel_pos(new_sel_end, unicode))) {
28060d4ae8dSGreg Kroah-Hartman 		for (pe = new_sel_end + 2; ; pe += 2)
281555b4ef7SJiri Slaby 			if (!isspace(sel_pos(pe, unicode)) ||
28260d4ae8dSGreg Kroah-Hartman 			    atedge(pe, vc->vc_size_row))
28360d4ae8dSGreg Kroah-Hartman 				break;
284555b4ef7SJiri Slaby 		if (isspace(sel_pos(pe, unicode)))
28560d4ae8dSGreg Kroah-Hartman 			new_sel_end = pe;
28660d4ae8dSGreg Kroah-Hartman 	}
2879256d09fSJiri Slaby 	if (vc_sel.start == -1)	/* no current selection */
28860d4ae8dSGreg Kroah-Hartman 		highlight(new_sel_start, new_sel_end);
2899256d09fSJiri Slaby 	else if (new_sel_start == vc_sel.start)
29060d4ae8dSGreg Kroah-Hartman 	{
2919256d09fSJiri Slaby 		if (new_sel_end == vc_sel.end)	/* no action required */
292e8c75a30SJiri Slaby 			return 0;
2939256d09fSJiri Slaby 		else if (new_sel_end > vc_sel.end)	/* extend to right */
2949256d09fSJiri Slaby 			highlight(vc_sel.end + 2, new_sel_end);
29560d4ae8dSGreg Kroah-Hartman 		else				/* contract from right */
2969256d09fSJiri Slaby 			highlight(new_sel_end + 2, vc_sel.end);
29760d4ae8dSGreg Kroah-Hartman 	}
2989256d09fSJiri Slaby 	else if (new_sel_end == vc_sel.end)
29960d4ae8dSGreg Kroah-Hartman 	{
3009256d09fSJiri Slaby 		if (new_sel_start < vc_sel.start) /* extend to left */
3019256d09fSJiri Slaby 			highlight(new_sel_start, vc_sel.start - 2);
30260d4ae8dSGreg Kroah-Hartman 		else				/* contract from left */
3039256d09fSJiri Slaby 			highlight(vc_sel.start, new_sel_start - 2);
30460d4ae8dSGreg Kroah-Hartman 	}
30560d4ae8dSGreg Kroah-Hartman 	else	/* some other case; start selection from scratch */
30660d4ae8dSGreg Kroah-Hartman 	{
30760d4ae8dSGreg Kroah-Hartman 		clear_selection();
30860d4ae8dSGreg Kroah-Hartman 		highlight(new_sel_start, new_sel_end);
30960d4ae8dSGreg Kroah-Hartman 	}
3109256d09fSJiri Slaby 	vc_sel.start = new_sel_start;
3119256d09fSJiri Slaby 	vc_sel.end = new_sel_end;
31260d4ae8dSGreg Kroah-Hartman 
3138fd31e69SJiri Slaby 	return vc_selection_store_chars(vc, unicode);
31460d4ae8dSGreg Kroah-Hartman }
3154b70dd57SJiri Slaby 
3169ba4ddbcSJiri Slaby static int vc_selection(struct vc_data *vc, struct tiocl_selection *v,
3179ba4ddbcSJiri Slaby 		struct tty_struct *tty)
3189ba4ddbcSJiri Slaby {
3199ba4ddbcSJiri Slaby 	int ps, pe;
3209ba4ddbcSJiri Slaby 
3219ba4ddbcSJiri Slaby 	poke_blanked_console();
3229ba4ddbcSJiri Slaby 
3239ba4ddbcSJiri Slaby 	if (v->sel_mode == TIOCL_SELCLEAR) {
3249ba4ddbcSJiri Slaby 		/* useful for screendump without selection highlights */
3259ba4ddbcSJiri Slaby 		clear_selection();
3269ba4ddbcSJiri Slaby 		return 0;
3279ba4ddbcSJiri Slaby 	}
3289ba4ddbcSJiri Slaby 
3299ba4ddbcSJiri Slaby 	v->xs = min_t(u16, v->xs - 1, vc->vc_cols - 1);
3309ba4ddbcSJiri Slaby 	v->ys = min_t(u16, v->ys - 1, vc->vc_rows - 1);
3319ba4ddbcSJiri Slaby 	v->xe = min_t(u16, v->xe - 1, vc->vc_cols - 1);
3329ba4ddbcSJiri Slaby 	v->ye = min_t(u16, v->ye - 1, vc->vc_rows - 1);
3339ba4ddbcSJiri Slaby 
3349ba4ddbcSJiri Slaby 	if (mouse_reporting() && (v->sel_mode & TIOCL_SELMOUSEREPORT)) {
3359ba4ddbcSJiri Slaby 		mouse_report(tty, v->sel_mode & TIOCL_SELBUTTONMASK, v->xs,
3369ba4ddbcSJiri Slaby 			     v->ys);
3379ba4ddbcSJiri Slaby 		return 0;
3389ba4ddbcSJiri Slaby 	}
3399ba4ddbcSJiri Slaby 
3409ba4ddbcSJiri Slaby 	ps = v->ys * vc->vc_size_row + (v->xs << 1);
3419ba4ddbcSJiri Slaby 	pe = v->ye * vc->vc_size_row + (v->xe << 1);
3429ba4ddbcSJiri Slaby 	if (ps > pe)	/* make vc_sel.start <= vc_sel.end */
3439ba4ddbcSJiri Slaby 		swap(ps, pe);
3449ba4ddbcSJiri Slaby 
3459ba4ddbcSJiri Slaby 	if (vc_sel.cons != vc) {
3469ba4ddbcSJiri Slaby 		clear_selection();
3479ba4ddbcSJiri Slaby 		vc_sel.cons = vc;
3489ba4ddbcSJiri Slaby 	}
3499ba4ddbcSJiri Slaby 
3509ba4ddbcSJiri Slaby 	return vc_do_selection(vc, v->sel_mode, ps, pe);
3519ba4ddbcSJiri Slaby }
3529ba4ddbcSJiri Slaby 
3534b70dd57SJiri Slaby int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty)
3544b70dd57SJiri Slaby {
3554b70dd57SJiri Slaby 	int ret;
3564b70dd57SJiri Slaby 
357cb05c6c8SGreg Kroah-Hartman 	mutex_lock(&vc_sel.lock);
3584b70dd57SJiri Slaby 	console_lock();
3599ba4ddbcSJiri Slaby 	ret = vc_selection(vc_cons[fg_console].d, v, tty);
3604b70dd57SJiri Slaby 	console_unlock();
3619256d09fSJiri Slaby 	mutex_unlock(&vc_sel.lock);
3624b70dd57SJiri Slaby 
36360d4ae8dSGreg Kroah-Hartman 	return ret;
36460d4ae8dSGreg Kroah-Hartman }
365496124e5SOkash Khawaja EXPORT_SYMBOL_GPL(set_selection_kernel);
36660d4ae8dSGreg Kroah-Hartman 
36760d4ae8dSGreg Kroah-Hartman /* Insert the contents of the selection buffer into the
36860d4ae8dSGreg Kroah-Hartman  * queue of the tty associated with the current console.
36960d4ae8dSGreg Kroah-Hartman  * Invoked by ioctl().
370906cbe13SJiri Slaby  *
37120f62579SAlan Cox  * Locking: called without locks. Calls the ldisc wrongly with
37220f62579SAlan Cox  * unsafe methods,
37360d4ae8dSGreg Kroah-Hartman  */
37460d4ae8dSGreg Kroah-Hartman int paste_selection(struct tty_struct *tty)
37560d4ae8dSGreg Kroah-Hartman {
37660d4ae8dSGreg Kroah-Hartman 	struct vc_data *vc = tty->driver_data;
37760d4ae8dSGreg Kroah-Hartman 	int	pasted = 0;
37860d4ae8dSGreg Kroah-Hartman 	unsigned int count;
37960d4ae8dSGreg Kroah-Hartman 	struct  tty_ldisc *ld;
38060d4ae8dSGreg Kroah-Hartman 	DECLARE_WAITQUEUE(wait, current);
381687bff0cSJiri Slaby 	int ret = 0;
38260d4ae8dSGreg Kroah-Hartman 
383ac751efaSTorben Hohn 	console_lock();
38460d4ae8dSGreg Kroah-Hartman 	poke_blanked_console();
385ac751efaSTorben Hohn 	console_unlock();
38660d4ae8dSGreg Kroah-Hartman 
38760d4ae8dSGreg Kroah-Hartman 	ld = tty_ldisc_ref_wait(tty);
388e55afd11SPeter Hurley 	if (!ld)
389e55afd11SPeter Hurley 		return -EIO;	/* ldisc was hung up */
390a7c8d58cSPeter Hurley 	tty_buffer_lock_exclusive(&vc->port);
39160d4ae8dSGreg Kroah-Hartman 
39260d4ae8dSGreg Kroah-Hartman 	add_wait_queue(&vc->paste_wait, &wait);
3939256d09fSJiri Slaby 	mutex_lock(&vc_sel.lock);
3949256d09fSJiri Slaby 	while (vc_sel.buffer && vc_sel.buf_len > pasted) {
39560d4ae8dSGreg Kroah-Hartman 		set_current_state(TASK_INTERRUPTIBLE);
396687bff0cSJiri Slaby 		if (signal_pending(current)) {
397687bff0cSJiri Slaby 			ret = -EINTR;
398687bff0cSJiri Slaby 			break;
399687bff0cSJiri Slaby 		}
40097ef38b8SPeter Hurley 		if (tty_throttled(tty)) {
4019256d09fSJiri Slaby 			mutex_unlock(&vc_sel.lock);
40260d4ae8dSGreg Kroah-Hartman 			schedule();
4039256d09fSJiri Slaby 			mutex_lock(&vc_sel.lock);
40460d4ae8dSGreg Kroah-Hartman 			continue;
40560d4ae8dSGreg Kroah-Hartman 		}
40661e86cc9SPeter Hurley 		__set_current_state(TASK_RUNNING);
4079256d09fSJiri Slaby 		count = vc_sel.buf_len - pasted;
4089256d09fSJiri Slaby 		count = tty_ldisc_receive_buf(ld, vc_sel.buffer + pasted, NULL,
40924a89d1cSPeter Hurley 					      count);
41060d4ae8dSGreg Kroah-Hartman 		pasted += count;
41160d4ae8dSGreg Kroah-Hartman 	}
4129256d09fSJiri Slaby 	mutex_unlock(&vc_sel.lock);
41360d4ae8dSGreg Kroah-Hartman 	remove_wait_queue(&vc->paste_wait, &wait);
41460d4ae8dSGreg Kroah-Hartman 	__set_current_state(TASK_RUNNING);
41560d4ae8dSGreg Kroah-Hartman 
416a7c8d58cSPeter Hurley 	tty_buffer_unlock_exclusive(&vc->port);
41760d4ae8dSGreg Kroah-Hartman 	tty_ldisc_deref(ld);
418687bff0cSJiri Slaby 	return ret;
41960d4ae8dSGreg Kroah-Hartman }
420496124e5SOkash Khawaja EXPORT_SYMBOL_GPL(paste_selection);
421