TTY: create drivers/tty/vt and move the vt code there

The vt and other related code is moved into the drivers/tty/vt directory.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 348 insertions, 0 deletions

diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c
new file mode 100644
index 0000000..ebae344
--- /dev/null
+++ b/drivers/tty/vt/selection.c
@@ -0,0 +1,348 @@
+/*
+ * 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;
+}