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viewed is used as a flag, i.e. bool. So treat is as such in most of the places. vcs_vc is handled in the next patch. Note: the last parameter of invert_screen was misnamed in the declaration since 1.1.92. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20200818085706.12163-3-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
421 lines
10 KiB
C
421 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* This module exports the functions:
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*
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* 'int set_selection_user(struct tiocl_selection __user *,
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* struct tty_struct *)'
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* 'int set_selection_kernel(struct tiocl_selection *, struct tty_struct *)'
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* 'void clear_selection(void)'
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* 'int paste_selection(struct tty_struct *)'
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* 'int sel_loadlut(char __user *)'
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*
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* Now that /dev/vcs exists, most of this can disappear again.
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*/
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#include <linux/module.h>
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#include <linux/tty.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <linux/kbd_kern.h>
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#include <linux/vt_kern.h>
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#include <linux/consolemap.h>
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#include <linux/selection.h>
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#include <linux/tiocl.h>
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#include <linux/console.h>
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#include <linux/tty_flip.h>
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#include <linux/sched/signal.h>
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/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
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#define isspace(c) ((c) == ' ')
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/* FIXME: all this needs locking */
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static struct vc_selection {
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struct mutex lock;
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struct vc_data *cons; /* must not be deallocated */
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char *buffer;
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unsigned int buf_len;
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volatile int start; /* cleared by clear_selection */
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int end;
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} vc_sel = {
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.lock = __MUTEX_INITIALIZER(vc_sel.lock),
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.start = -1,
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};
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/* clear_selection, highlight and highlight_pointer can be called
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from interrupt (via scrollback/front) */
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/* set reverse video on characters s-e of console with selection. */
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static inline void highlight(const int s, const int e)
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{
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invert_screen(vc_sel.cons, s, e-s+2, true);
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}
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/* use complementary color to show the pointer */
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static inline void highlight_pointer(const int where)
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{
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complement_pos(vc_sel.cons, where);
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}
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static u32
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sel_pos(int n, bool unicode)
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{
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if (unicode)
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return screen_glyph_unicode(vc_sel.cons, n / 2);
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return inverse_translate(vc_sel.cons, screen_glyph(vc_sel.cons, n), 0);
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}
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/**
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* clear_selection - remove current selection
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*
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* Remove the current selection highlight, if any from the console
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* holding the selection. The caller must hold the console lock.
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*/
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void clear_selection(void)
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{
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highlight_pointer(-1); /* hide the pointer */
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if (vc_sel.start != -1) {
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highlight(vc_sel.start, vc_sel.end);
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vc_sel.start = -1;
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}
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}
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EXPORT_SYMBOL_GPL(clear_selection);
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bool vc_is_sel(struct vc_data *vc)
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{
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return vc == vc_sel.cons;
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}
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/*
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* User settable table: what characters are to be considered alphabetic?
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* 128 bits. Locked by the console lock.
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*/
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static u32 inwordLut[]={
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0x00000000, /* control chars */
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0x03FFE000, /* digits and "-./" */
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0x87FFFFFE, /* uppercase and '_' */
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0x07FFFFFE, /* lowercase */
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};
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static inline int inword(const u32 c)
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{
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return c > 0x7f || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
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}
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/**
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* set loadlut - load the LUT table
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* @p: user table
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*
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* Load the LUT table from user space. The caller must hold the console
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* lock. Make a temporary copy so a partial update doesn't make a mess.
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*/
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int sel_loadlut(char __user *p)
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{
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u32 tmplut[ARRAY_SIZE(inwordLut)];
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if (copy_from_user(tmplut, (u32 __user *)(p+4), sizeof(inwordLut)))
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return -EFAULT;
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memcpy(inwordLut, tmplut, sizeof(inwordLut));
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return 0;
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}
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/* does screen address p correspond to character at LH/RH edge of screen? */
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static inline int atedge(const int p, int size_row)
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{
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return (!(p % size_row) || !((p + 2) % size_row));
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}
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/* stores the char in UTF8 and returns the number of bytes used (1-4) */
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static int store_utf8(u32 c, char *p)
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{
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if (c < 0x80) {
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/* 0******* */
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p[0] = c;
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return 1;
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} else if (c < 0x800) {
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/* 110***** 10****** */
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p[0] = 0xc0 | (c >> 6);
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p[1] = 0x80 | (c & 0x3f);
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return 2;
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} else if (c < 0x10000) {
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/* 1110**** 10****** 10****** */
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p[0] = 0xe0 | (c >> 12);
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p[1] = 0x80 | ((c >> 6) & 0x3f);
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p[2] = 0x80 | (c & 0x3f);
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return 3;
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} else if (c < 0x110000) {
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/* 11110*** 10****** 10****** 10****** */
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p[0] = 0xf0 | (c >> 18);
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p[1] = 0x80 | ((c >> 12) & 0x3f);
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p[2] = 0x80 | ((c >> 6) & 0x3f);
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p[3] = 0x80 | (c & 0x3f);
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return 4;
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} else {
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/* outside Unicode, replace with U+FFFD */
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p[0] = 0xef;
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p[1] = 0xbf;
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p[2] = 0xbd;
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return 3;
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}
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}
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/**
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* set_selection_user - set the current selection.
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* @sel: user selection info
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* @tty: the console tty
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*
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* Invoked by the ioctl handle for the vt layer.
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*
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* The entire selection process is managed under the console_lock. It's
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* a lot under the lock but its hardly a performance path
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*/
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int set_selection_user(const struct tiocl_selection __user *sel,
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struct tty_struct *tty)
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{
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struct tiocl_selection v;
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if (copy_from_user(&v, sel, sizeof(*sel)))
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return -EFAULT;
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return set_selection_kernel(&v, tty);
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}
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static int vc_selection_store_chars(struct vc_data *vc, bool unicode)
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{
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char *bp, *obp;
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unsigned int i;
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/* Allocate a new buffer before freeing the old one ... */
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/* chars can take up to 4 bytes with unicode */
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bp = kmalloc_array((vc_sel.end - vc_sel.start) / 2 + 1, unicode ? 4 : 1,
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GFP_KERNEL | __GFP_NOWARN);
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if (!bp) {
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printk(KERN_WARNING "selection: kmalloc() failed\n");
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clear_selection();
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return -ENOMEM;
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}
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kfree(vc_sel.buffer);
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vc_sel.buffer = bp;
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obp = bp;
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for (i = vc_sel.start; i <= vc_sel.end; i += 2) {
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u32 c = sel_pos(i, unicode);
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if (unicode)
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bp += store_utf8(c, bp);
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else
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*bp++ = c;
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if (!isspace(c))
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obp = bp;
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if (!((i + 2) % vc->vc_size_row)) {
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/* strip trailing blanks from line and add newline,
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unless non-space at end of line. */
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if (obp != bp) {
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bp = obp;
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*bp++ = '\r';
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}
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obp = bp;
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}
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}
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vc_sel.buf_len = bp - vc_sel.buffer;
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return 0;
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}
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static int vc_do_selection(struct vc_data *vc, unsigned short mode, int ps,
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int pe)
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{
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int new_sel_start, new_sel_end, spc;
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bool unicode = vt_do_kdgkbmode(fg_console) == K_UNICODE;
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switch (mode) {
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case TIOCL_SELCHAR: /* character-by-character selection */
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new_sel_start = ps;
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new_sel_end = pe;
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break;
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case TIOCL_SELWORD: /* word-by-word selection */
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spc = isspace(sel_pos(ps, unicode));
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for (new_sel_start = ps; ; ps -= 2) {
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if ((spc && !isspace(sel_pos(ps, unicode))) ||
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(!spc && !inword(sel_pos(ps, unicode))))
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break;
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new_sel_start = ps;
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if (!(ps % vc->vc_size_row))
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break;
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}
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spc = isspace(sel_pos(pe, unicode));
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for (new_sel_end = pe; ; pe += 2) {
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if ((spc && !isspace(sel_pos(pe, unicode))) ||
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(!spc && !inword(sel_pos(pe, unicode))))
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break;
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new_sel_end = pe;
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if (!((pe + 2) % vc->vc_size_row))
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break;
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}
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break;
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case TIOCL_SELLINE: /* line-by-line selection */
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new_sel_start = rounddown(ps, vc->vc_size_row);
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new_sel_end = rounddown(pe, vc->vc_size_row) +
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vc->vc_size_row - 2;
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break;
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case TIOCL_SELPOINTER:
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highlight_pointer(pe);
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return 0;
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default:
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return -EINVAL;
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}
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/* remove the pointer */
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highlight_pointer(-1);
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/* select to end of line if on trailing space */
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if (new_sel_end > new_sel_start &&
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!atedge(new_sel_end, vc->vc_size_row) &&
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isspace(sel_pos(new_sel_end, unicode))) {
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for (pe = new_sel_end + 2; ; pe += 2)
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if (!isspace(sel_pos(pe, unicode)) ||
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atedge(pe, vc->vc_size_row))
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break;
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if (isspace(sel_pos(pe, unicode)))
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new_sel_end = pe;
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}
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if (vc_sel.start == -1) /* no current selection */
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highlight(new_sel_start, new_sel_end);
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else if (new_sel_start == vc_sel.start)
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{
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if (new_sel_end == vc_sel.end) /* no action required */
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return 0;
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else if (new_sel_end > vc_sel.end) /* extend to right */
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highlight(vc_sel.end + 2, new_sel_end);
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else /* contract from right */
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highlight(new_sel_end + 2, vc_sel.end);
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}
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else if (new_sel_end == vc_sel.end)
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{
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if (new_sel_start < vc_sel.start) /* extend to left */
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highlight(new_sel_start, vc_sel.start - 2);
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else /* contract from left */
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highlight(vc_sel.start, new_sel_start - 2);
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}
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else /* some other case; start selection from scratch */
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{
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clear_selection();
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highlight(new_sel_start, new_sel_end);
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}
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vc_sel.start = new_sel_start;
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vc_sel.end = new_sel_end;
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return vc_selection_store_chars(vc, unicode);
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}
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static int vc_selection(struct vc_data *vc, struct tiocl_selection *v,
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struct tty_struct *tty)
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{
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int ps, pe;
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poke_blanked_console();
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if (v->sel_mode == TIOCL_SELCLEAR) {
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/* useful for screendump without selection highlights */
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clear_selection();
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return 0;
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}
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v->xs = min_t(u16, v->xs - 1, vc->vc_cols - 1);
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v->ys = min_t(u16, v->ys - 1, vc->vc_rows - 1);
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v->xe = min_t(u16, v->xe - 1, vc->vc_cols - 1);
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v->ye = min_t(u16, v->ye - 1, vc->vc_rows - 1);
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if (mouse_reporting() && (v->sel_mode & TIOCL_SELMOUSEREPORT)) {
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mouse_report(tty, v->sel_mode & TIOCL_SELBUTTONMASK, v->xs,
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v->ys);
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return 0;
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}
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ps = v->ys * vc->vc_size_row + (v->xs << 1);
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pe = v->ye * vc->vc_size_row + (v->xe << 1);
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if (ps > pe) /* make vc_sel.start <= vc_sel.end */
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swap(ps, pe);
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if (vc_sel.cons != vc) {
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clear_selection();
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vc_sel.cons = vc;
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}
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return vc_do_selection(vc, v->sel_mode, ps, pe);
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}
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int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty)
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{
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int ret;
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mutex_lock(&vc_sel.lock);
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console_lock();
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ret = vc_selection(vc_cons[fg_console].d, v, tty);
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console_unlock();
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mutex_unlock(&vc_sel.lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(set_selection_kernel);
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/* Insert the contents of the selection buffer into the
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* queue of the tty associated with the current console.
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* Invoked by ioctl().
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*
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* Locking: called without locks. Calls the ldisc wrongly with
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* unsafe methods,
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*/
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int paste_selection(struct tty_struct *tty)
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{
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struct vc_data *vc = tty->driver_data;
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int pasted = 0;
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unsigned int count;
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struct tty_ldisc *ld;
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DECLARE_WAITQUEUE(wait, current);
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int ret = 0;
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console_lock();
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poke_blanked_console();
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console_unlock();
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ld = tty_ldisc_ref_wait(tty);
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if (!ld)
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return -EIO; /* ldisc was hung up */
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tty_buffer_lock_exclusive(&vc->port);
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add_wait_queue(&vc->paste_wait, &wait);
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mutex_lock(&vc_sel.lock);
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while (vc_sel.buffer && vc_sel.buf_len > pasted) {
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set_current_state(TASK_INTERRUPTIBLE);
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if (signal_pending(current)) {
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ret = -EINTR;
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break;
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}
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if (tty_throttled(tty)) {
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mutex_unlock(&vc_sel.lock);
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schedule();
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mutex_lock(&vc_sel.lock);
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continue;
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}
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__set_current_state(TASK_RUNNING);
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count = vc_sel.buf_len - pasted;
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count = tty_ldisc_receive_buf(ld, vc_sel.buffer + pasted, NULL,
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count);
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pasted += count;
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}
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mutex_unlock(&vc_sel.lock);
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remove_wait_queue(&vc->paste_wait, &wait);
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__set_current_state(TASK_RUNNING);
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tty_buffer_unlock_exclusive(&vc->port);
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tty_ldisc_deref(ld);
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return ret;
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}
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EXPORT_SYMBOL_GPL(paste_selection);
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