/* * 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; }