// SPDX-License-Identifier: GPL-2.0/* * This module exports the functions: * * 'int set_selection_user(struct tiocl_selection __user *, * struct tty_struct *)' * 'int set_selection_kernel(struct tiocl_selection *, struct tty_struct *)' * 'void clear_selection(void)' * 'int paste_selection(struct tty_struct *)' * 'int sel_loadlut(u32 __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/mutex.h>#include <linux/slab.h>#include <linux/types.h> #include <linux/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/tty_flip.h> #include <linux/sched/signal.h> /* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */#define is_space_on_vt(c) ((c) == ' ') /* FIXME: all this needs locking */static struct vc_selection { struct mutex lock; struct vc_data *cons; /* must not be deallocated */ char *buffer; unsigned int buf_len; volatile int start; /* cleared by clear_selection */ int end;} vc_sel = { .lock = __MUTEX_INITIALIZER(vc_sel.lock), .start = -1,}; /* 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(vc_sel.cons, s, e-s+2, true);} /* use complementary color to show the pointer */static inline void highlight_pointer(const int where){ complement_pos(vc_sel.cons, where);} static u32sel_pos(int n, bool unicode){ if (unicode) return screen_glyph_unicode(vc_sel.cons, n / 2); return inverse_translate(vc_sel.cons, screen_glyph(vc_sel.cons, n), false);} /** * clear_selection - remove current selection * * Remove the current selection highlight, if any from the console holding the * selection. * * Locking: The caller must hold the console lock. */void clear_selection(void){ highlight_pointer(-1); /* hide the pointer */ if (vc_sel.start != -1) { highlight(vc_sel.start, vc_sel.end); vc_sel.start = -1; }}EXPORT_SYMBOL_GPL(clear_selection); bool vc_is_sel(const struct vc_data *vc){ return vc == vc_sel.cons;} /* * User settable table: what characters are to be considered alphabetic? * 128 bits. Locked by the console lock. */static u32 inwordLut[]={ 0x00000000, /* control chars */ 0x03FFE000, /* digits and "-./" */ 0x87FFFFFE, /* uppercase and '_' */ 0x07FFFFFE, /* lowercase */}; static inline int inword(const u32 c){ return c > 0x7f || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);} /** * sel_loadlut() - load the LUT table * @lut: user table * * Load the LUT table from user space. Make a temporary copy so a partial * update doesn't make a mess. * * Locking: The console lock is acquired. */int sel_loadlut(u32 __user *lut){ u32 tmplut[ARRAY_SIZE(inwordLut)]; if (copy_from_user(tmplut, lut, sizeof(inwordLut))) return -EFAULT; guard(console_lock)(); memcpy(inwordLut, tmplut, sizeof(inwordLut)); return 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));} /* stores the char in UTF8 and returns the number of bytes used (1-4) */static int store_utf8(u32 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 if (c < 0x10000) { /* 1110**** 10****** 10****** */ p[0] = 0xe0 | (c >> 12); p[1] = 0x80 | ((c >> 6) & 0x3f); p[2] = 0x80 | (c & 0x3f); return 3; } else if (c < 0x110000) { /* 11110*** 10****** 10****** 10****** */ p[0] = 0xf0 | (c >> 18); p[1] = 0x80 | ((c >> 12) & 0x3f); p[2] = 0x80 | ((c >> 6) & 0x3f); p[3] = 0x80 | (c & 0x3f); return 4; } else { /* outside Unicode, replace with U+FFFD */ p[0] = 0xef; p[1] = 0xbf; p[2] = 0xbd; return 3; }} /** * set_selection_user - set the current selection. * @sel: user selection info * @tty: the console tty * * Invoked by the ioctl handle for the vt layer. * * Locking: The entire selection process is managed under the console_lock. * It's a lot under the lock but its hardly a performance path. */int set_selection_user(const struct tiocl_selection __user *sel, struct tty_struct *tty){ struct tiocl_selection v; if (copy_from_user(&v, sel, sizeof(*sel))) return -EFAULT; /* * TIOCL_SELCLEAR and TIOCL_SELPOINTER are OK to use without * CAP_SYS_ADMIN as they do not modify the selection. */ switch (v.sel_mode) { case TIOCL_SELCLEAR: case TIOCL_SELPOINTER: break; default: if (!capable(CAP_SYS_ADMIN)) return -EPERM; } return set_selection_kernel(&v, tty);} static int vc_selection_store_chars(struct vc_data *vc, bool unicode){ char *bp, *obp; unsigned int i; /* Allocate a new buffer before freeing the old one ... */ /* chars can take up to 4 bytes with unicode */ bp = kmalloc_array((vc_sel.end - vc_sel.start) / 2 + 1, unicode ? 4 : 1, GFP_KERNEL | __GFP_NOWARN); if (!bp) { printk(KERN_WARNING "selection: kmalloc() failed\n"); clear_selection(); return -ENOMEM; } kfree(vc_sel.buffer); vc_sel.buffer = bp; obp = bp; for (i = vc_sel.start; i <= vc_sel.end; i += 2) { u32 c = sel_pos(i, unicode); if (unicode) bp += store_utf8(c, bp); else *bp++ = c; if (!is_space_on_vt(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; } } vc_sel.buf_len = bp - vc_sel.buffer; return 0;} static int vc_do_selection(struct vc_data *vc, unsigned short mode, int ps, int pe){ int new_sel_start, new_sel_end, spc; bool unicode = vt_do_kdgkbmode(fg_console) == K_UNICODE; switch (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 = is_space_on_vt(sel_pos(ps, unicode)); for (new_sel_start = ps; ; ps -= 2) { if ((spc && !is_space_on_vt(sel_pos(ps, unicode))) || (!spc && !inword(sel_pos(ps, unicode)))) break; new_sel_start = ps; if (!(ps % vc->vc_size_row)) break; } spc = is_space_on_vt(sel_pos(pe, unicode)); for (new_sel_end = pe; ; pe += 2) { if ((spc && !is_space_on_vt(sel_pos(pe, unicode))) || (!spc && !inword(sel_pos(pe, unicode)))) break; new_sel_end = pe; if (!((pe + 2) % vc->vc_size_row)) break; } break; case TIOCL_SELLINE: /* line-by-line selection */ new_sel_start = rounddown(ps, vc->vc_size_row); new_sel_end = rounddown(pe, vc->vc_size_row) + 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) && is_space_on_vt(sel_pos(new_sel_end, unicode))) { for (pe = new_sel_end + 2; ; pe += 2) if (!is_space_on_vt(sel_pos(pe, unicode)) || atedge(pe, vc->vc_size_row)) break; if (is_space_on_vt(sel_pos(pe, unicode))) new_sel_end = pe; } if (vc_sel.start == -1) /* no current selection */ highlight(new_sel_start, new_sel_end); else if (new_sel_start == vc_sel.start) { if (new_sel_end == vc_sel.end) /* no action required */ return 0; else if (new_sel_end > vc_sel.end) /* extend to right */ highlight(vc_sel.end + 2, new_sel_end); else /* contract from right */ highlight(new_sel_end + 2, vc_sel.end); } else if (new_sel_end == vc_sel.end) { if (new_sel_start < vc_sel.start) /* extend to left */ highlight(new_sel_start, vc_sel.start - 2); else /* contract from left */ highlight(vc_sel.start, new_sel_start - 2); } else /* some other case; start selection from scratch */ { clear_selection(); highlight(new_sel_start, new_sel_end); } vc_sel.start = new_sel_start; vc_sel.end = new_sel_end; return vc_selection_store_chars(vc, unicode);} static int vc_selection(struct vc_data *vc, struct tiocl_selection *v, struct tty_struct *tty){ int ps, pe; poke_blanked_console(); if (v->sel_mode == TIOCL_SELCLEAR) { /* useful for screendump without selection highlights */ clear_selection(); return 0; } /* Historically 0 => max value */ v->xs = umin(v->xs - 1, vc->vc_cols - 1); v->ys = umin(v->ys - 1, vc->vc_rows - 1); v->xe = umin(v->xe - 1, vc->vc_cols - 1); v->ye = umin(v->ye - 1, vc->vc_rows - 1); if (mouse_reporting() && (v->sel_mode & TIOCL_SELMOUSEREPORT)) { mouse_report(tty, v->sel_mode & TIOCL_SELBUTTONMASK, v->xs, v->ys); return 0; } ps = v->ys * vc->vc_size_row + (v->xs << 1); pe = v->ye * vc->vc_size_row + (v->xe << 1); if (ps > pe) /* make vc_sel.start <= vc_sel.end */ swap(ps, pe); if (vc_sel.cons != vc) { clear_selection(); vc_sel.cons = vc; } return vc_do_selection(vc, v->sel_mode, ps, pe);} int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty){ guard(mutex)(&vc_sel.lock); guard(console_lock)(); return vc_selection(vc_cons[fg_console].d, v, tty);}EXPORT_SYMBOL_GPL(set_selection_kernel); /* Insert the contents of the selection buffer into the * queue of the tty associated with the current console. * Invoked by ioctl(). * * Locking: called without locks. Calls the ldisc wrongly with * unsafe methods, */int paste_selection(struct tty_struct *tty){ struct vc_data *vc = tty->driver_data; int pasted = 0; size_t count; struct tty_ldisc *ld; DECLARE_WAITQUEUE(wait, current); int ret = 0; bool bp = vc->vc_bracketed_paste; static const char bracketed_paste_start[] = "\033[200~"; static const char bracketed_paste_end[] = "\033[201~"; const char *bps = bp ? bracketed_paste_start : NULL; const char *bpe = bp ? bracketed_paste_end : NULL; scoped_guard(console_lock) poke_blanked_console(); ld = tty_ldisc_ref_wait(tty); if (!ld) return -EIO; /* ldisc was hung up */ tty_buffer_lock_exclusive(&vc->port); add_wait_queue(&vc->paste_wait, &wait); mutex_lock(&vc_sel.lock); while (vc_sel.buffer && (vc_sel.buf_len > pasted || bpe)) { set_current_state(TASK_INTERRUPTIBLE); if (signal_pending(current)) { ret = -EINTR; break; } if (tty_throttled(tty)) { mutex_unlock(&vc_sel.lock); schedule(); mutex_lock(&vc_sel.lock); continue; } __set_current_state(TASK_RUNNING); if (bps) { bps += tty_ldisc_receive_buf(ld, bps, NULL, strlen(bps)); if (*bps != '\0') continue; bps = NULL; } count = vc_sel.buf_len - pasted; if (count) { pasted += tty_ldisc_receive_buf(ld, vc_sel.buffer + pasted, NULL, count); if (vc_sel.buf_len > pasted) continue; } if (bpe) { bpe += tty_ldisc_receive_buf(ld, bpe, NULL, strlen(bpe)); if (*bpe == '\0') bpe = NULL; } } mutex_unlock(&vc_sel.lock); remove_wait_queue(&vc->paste_wait, &wait); __set_current_state(TASK_RUNNING); tty_buffer_unlock_exclusive(&vc->port); tty_ldisc_deref(ld); return ret;}EXPORT_SYMBOL_GPL(paste_selection);
// SPDX-License-Identifier: GPL-2.0
/*
* This module exports the functions:
*
* 'int set_selection_user(struct tiocl_selection __user *,
* struct tty_struct *)'
* 'int set_selection_kernel(struct tiocl_selection *, struct tty_struct *)'
* 'void clear_selection(void)'
* 'int paste_selection(struct tty_struct *)'
* 'int sel_loadlut(u32 __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/mutex.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/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/tty_flip.h>
#include <linux/sched/signal.h>
/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
#define is_space_on_vt(c) ((c) == ' ')
/* FIXME: all this needs locking */
static struct vc_selection {
struct mutex lock;
struct vc_data *cons; /* must not be deallocated */
char *buffer;
unsigned int buf_len;
volatile int start; /* cleared by clear_selection */
int end;
} vc_sel = {
.lock = __MUTEX_INITIALIZER(vc_sel.lock),
.start = -1,
};
/* 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(vc_sel.cons, s, e-s+2, true);
}
/* use complementary color to show the pointer */
static inline void highlight_pointer(const int where)
{
complement_pos(vc_sel.cons, where);
}
static u32
sel_pos(int n, bool unicode)
{
if (unicode)
return screen_glyph_unicode(vc_sel.cons, n / 2);
return inverse_translate(vc_sel.cons, screen_glyph(vc_sel.cons, n),
false);
}
/**
* clear_selection - remove current selection
*
* Remove the current selection highlight, if any from the console holding the
* selection.
*
* Locking: The caller must hold the console lock.
*/
void clear_selection(void)
{
highlight_pointer(-1); /* hide the pointer */
if (vc_sel.start != -1) {
highlight(vc_sel.start, vc_sel.end);
vc_sel.start = -1;
}
}
EXPORT_SYMBOL_GPL(clear_selection);
bool vc_is_sel(const struct vc_data *vc)
{
return vc == vc_sel.cons;
}
/*
* User settable table: what characters are to be considered alphabetic?
* 128 bits. Locked by the console lock.
*/
static u32 inwordLut[]={
0x00000000, /* control chars */
0x03FFE000, /* digits and "-./" */
0x87FFFFFE, /* uppercase and '_' */
0x07FFFFFE, /* lowercase */
};
static inline int inword(const u32 c)
{
return c > 0x7f || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
}
/**
* sel_loadlut() - load the LUT table
* @lut: user table
*
* Load the LUT table from user space. Make a temporary copy so a partial
* update doesn't make a mess.
*
* Locking: The console lock is acquired.
*/
int sel_loadlut(u32 __user *lut)
{
u32 tmplut[ARRAY_SIZE(inwordLut)];
if (copy_from_user(tmplut, lut, sizeof(inwordLut)))
return -EFAULT;
guard(console_lock)();
memcpy(inwordLut, tmplut, sizeof(inwordLut));
return 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));
}
/* stores the char in UTF8 and returns the number of bytes used (1-4) */
static int store_utf8(u32 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 if (c < 0x10000) {
/* 1110**** 10****** 10****** */
p[0] = 0xe0 | (c >> 12);
p[1] = 0x80 | ((c >> 6) & 0x3f);
p[2] = 0x80 | (c & 0x3f);
return 3;
} else if (c < 0x110000) {
/* 11110*** 10****** 10****** 10****** */
p[0] = 0xf0 | (c >> 18);
p[1] = 0x80 | ((c >> 12) & 0x3f);
p[2] = 0x80 | ((c >> 6) & 0x3f);
p[3] = 0x80 | (c & 0x3f);
return 4;
} else {
/* outside Unicode, replace with U+FFFD */
p[0] = 0xef;
p[1] = 0xbf;
p[2] = 0xbd;
return 3;
}
}
/**
* set_selection_user - set the current selection.
* @sel: user selection info
* @tty: the console tty
*
* Invoked by the ioctl handle for the vt layer.
*
* Locking: The entire selection process is managed under the console_lock.
* It's a lot under the lock but its hardly a performance path.
*/
int set_selection_user(const struct tiocl_selection __user *sel,
struct tty_struct *tty)
{
struct tiocl_selection v;
if (copy_from_user(&v, sel, sizeof(*sel)))
return -EFAULT;
/*
* TIOCL_SELCLEAR and TIOCL_SELPOINTER are OK to use without
* CAP_SYS_ADMIN as they do not modify the selection.
*/
switch (v.sel_mode) {
case TIOCL_SELCLEAR:
case TIOCL_SELPOINTER:
break;
default:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
}
return set_selection_kernel(&v, tty);
}
static int vc_selection_store_chars(struct vc_data *vc, bool unicode)
{
char *bp, *obp;
unsigned int i;
/* Allocate a new buffer before freeing the old one ... */
/* chars can take up to 4 bytes with unicode */
bp = kmalloc_array((vc_sel.end - vc_sel.start) / 2 + 1, unicode ? 4 : 1,
GFP_KERNEL | __GFP_NOWARN);
if (!bp) {
printk(KERN_WARNING "selection: kmalloc() failed\n");
clear_selection();
return -ENOMEM;
}
kfree(vc_sel.buffer);
vc_sel.buffer = bp;
obp = bp;
for (i = vc_sel.start; i <= vc_sel.end; i += 2) {
u32 c = sel_pos(i, unicode);
if (unicode)
bp += store_utf8(c, bp);
else
*bp++ = c;
if (!is_space_on_vt(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;
}
}
vc_sel.buf_len = bp - vc_sel.buffer;
return 0;
}
static int vc_do_selection(struct vc_data *vc, unsigned short mode, int ps,
int pe)
{
int new_sel_start, new_sel_end, spc;
bool unicode = vt_do_kdgkbmode(fg_console) == K_UNICODE;
switch (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 = is_space_on_vt(sel_pos(ps, unicode));
for (new_sel_start = ps; ; ps -= 2) {
if ((spc && !is_space_on_vt(sel_pos(ps, unicode))) ||
(!spc && !inword(sel_pos(ps, unicode))))
break;
new_sel_start = ps;
if (!(ps % vc->vc_size_row))
break;
}
spc = is_space_on_vt(sel_pos(pe, unicode));
for (new_sel_end = pe; ; pe += 2) {
if ((spc && !is_space_on_vt(sel_pos(pe, unicode))) ||
(!spc && !inword(sel_pos(pe, unicode))))
break;
new_sel_end = pe;
if (!((pe + 2) % vc->vc_size_row))
break;
}
break;
case TIOCL_SELLINE: /* line-by-line selection */
new_sel_start = rounddown(ps, vc->vc_size_row);
new_sel_end = rounddown(pe, vc->vc_size_row) +
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) &&
is_space_on_vt(sel_pos(new_sel_end, unicode))) {
for (pe = new_sel_end + 2; ; pe += 2)
if (!is_space_on_vt(sel_pos(pe, unicode)) ||
atedge(pe, vc->vc_size_row))
break;
if (is_space_on_vt(sel_pos(pe, unicode)))
new_sel_end = pe;
}
if (vc_sel.start == -1) /* no current selection */
highlight(new_sel_start, new_sel_end);
else if (new_sel_start == vc_sel.start)
{
if (new_sel_end == vc_sel.end) /* no action required */
return 0;
else if (new_sel_end > vc_sel.end) /* extend to right */
highlight(vc_sel.end + 2, new_sel_end);
else /* contract from right */
highlight(new_sel_end + 2, vc_sel.end);
}
else if (new_sel_end == vc_sel.end)
{
if (new_sel_start < vc_sel.start) /* extend to left */
highlight(new_sel_start, vc_sel.start - 2);
else /* contract from left */
highlight(vc_sel.start, new_sel_start - 2);
}
else /* some other case; start selection from scratch */
{
clear_selection();
highlight(new_sel_start, new_sel_end);
}
vc_sel.start = new_sel_start;
vc_sel.end = new_sel_end;
return vc_selection_store_chars(vc, unicode);
}
static int vc_selection(struct vc_data *vc, struct tiocl_selection *v,
struct tty_struct *tty)
{
int ps, pe;
poke_blanked_console();
if (v->sel_mode == TIOCL_SELCLEAR) {
/* useful for screendump without selection highlights */
clear_selection();
return 0;
}
/* Historically 0 => max value */
v->xs = umin(v->xs - 1, vc->vc_cols - 1);
v->ys = umin(v->ys - 1, vc->vc_rows - 1);
v->xe = umin(v->xe - 1, vc->vc_cols - 1);
v->ye = umin(v->ye - 1, vc->vc_rows - 1);
if (mouse_reporting() && (v->sel_mode & TIOCL_SELMOUSEREPORT)) {
mouse_report(tty, v->sel_mode & TIOCL_SELBUTTONMASK, v->xs,
v->ys);
return 0;
}
ps = v->ys * vc->vc_size_row + (v->xs << 1);
pe = v->ye * vc->vc_size_row + (v->xe << 1);
if (ps > pe) /* make vc_sel.start <= vc_sel.end */
swap(ps, pe);
if (vc_sel.cons != vc) {
clear_selection();
vc_sel.cons = vc;
}
return vc_do_selection(vc, v->sel_mode, ps, pe);
}
int set_selection_kernel(struct tiocl_selection *v, struct tty_struct *tty)
{
guard(mutex)(&vc_sel.lock);
guard(console_lock)();
return vc_selection(vc_cons[fg_console].d, v, tty);
}
EXPORT_SYMBOL_GPL(set_selection_kernel);
/* Insert the contents of the selection buffer into the
* queue of the tty associated with the current console.
* Invoked by ioctl().
*
* Locking: called without locks. Calls the ldisc wrongly with
* unsafe methods,
*/
int paste_selection(struct tty_struct *tty)
{
struct vc_data *vc = tty->driver_data;
int pasted = 0;
size_t count;
struct tty_ldisc *ld;
DECLARE_WAITQUEUE(wait, current);
int ret = 0;
bool bp = vc->vc_bracketed_paste;
static const char bracketed_paste_start[] = "\033[200~";
static const char bracketed_paste_end[] = "\033[201~";
const char *bps = bp ? bracketed_paste_start : NULL;
const char *bpe = bp ? bracketed_paste_end : NULL;
scoped_guard(console_lock)
poke_blanked_console();
ld = tty_ldisc_ref_wait(tty);
if (!ld)
return -EIO; /* ldisc was hung up */
tty_buffer_lock_exclusive(&vc->port);
add_wait_queue(&vc->paste_wait, &wait);
mutex_lock(&vc_sel.lock);
while (vc_sel.buffer && (vc_sel.buf_len > pasted || bpe)) {
set_current_state(TASK_INTERRUPTIBLE);
if (signal_pending(current)) {
ret = -EINTR;
break;
}
if (tty_throttled(tty)) {
mutex_unlock(&vc_sel.lock);
schedule();
mutex_lock(&vc_sel.lock);
continue;
}
__set_current_state(TASK_RUNNING);
if (bps) {
bps += tty_ldisc_receive_buf(ld, bps, NULL, strlen(bps));
if (*bps != '\0')
continue;
bps = NULL;
}
count = vc_sel.buf_len - pasted;
if (count) {
pasted += tty_ldisc_receive_buf(ld, vc_sel.buffer + pasted,
NULL, count);
if (vc_sel.buf_len > pasted)
continue;
}
if (bpe) {
bpe += tty_ldisc_receive_buf(ld, bpe, NULL, strlen(bpe));
if (*bpe == '\0')
bpe = NULL;
}
}
mutex_unlock(&vc_sel.lock);
remove_wait_queue(&vc->paste_wait, &wait);
__set_current_state(TASK_RUNNING);
tty_buffer_unlock_exclusive(&vc->port);
tty_ldisc_deref(ld);
return ret;
}
EXPORT_SYMBOL_GPL(paste_selection);