| /* |
| * linux/drivers/char/selection.c |
| * |
| * This module exports the functions: |
| * |
| * 'int set_selection(const unsigned long arg)' |
| * 'void clear_selection(void)' |
| * 'int paste_selection(struct tty_struct *tty)' |
| * 'int sel_loadlut(const unsigned long arg)' |
| * |
| * 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/vt_kern.h> |
| #include <linux/consolemap.h> |
| #include <linux/console_struct.h> |
| #include <linux/selection.h> |
| |
| #ifndef MIN |
| #define MIN(a,b) ((a) < (b) ? (a) : (b)) |
| #endif |
| |
| /* 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) */ |
| int sel_cons; /* must not be disallocated */ |
| 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. */ |
| inline static void |
| highlight(const int s, const int e) { |
| invert_screen(sel_cons, s, e-s+2, 1); |
| } |
| |
| /* use complementary color to show the pointer */ |
| inline static void |
| highlight_pointer(const int where) { |
| complement_pos(sel_cons, where); |
| } |
| |
| static unsigned char |
| sel_pos(int n) |
| { |
| return inverse_translate(vc_cons[sel_cons].d, screen_glyph(sel_cons, n)); |
| } |
| |
| /* 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 unsigned char c) { |
| return ( inwordLut[c>>5] >> (c & 0x1F) ) & 1; |
| } |
| |
| /* set inwordLut contents. Invoked by ioctl(). */ |
| int sel_loadlut(const unsigned long arg) |
| { |
| return copy_from_user(inwordLut, (u32 *)(arg+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; |
| } |
| |
| /* set the current selection. Invoked by ioctl() or by kernel code. */ |
| int set_selection(const unsigned long arg, struct tty_struct *tty, int user) |
| { |
| int sel_mode, new_sel_start, new_sel_end, spc; |
| char *bp, *obp; |
| int i, ps, pe; |
| unsigned int currcons = fg_console; |
| |
| unblank_screen(); |
| poke_blanked_console(); |
| |
| { unsigned short *args, xs, ys, xe, ye; |
| |
| args = (unsigned short *)(arg + 1); |
| if (user) { |
| if (verify_area(VERIFY_READ, args, sizeof(short) * 5)) |
| return -EFAULT; |
| __get_user(xs, args++); |
| __get_user(ys, args++); |
| __get_user(xe, args++); |
| __get_user(ye, args++); |
| __get_user(sel_mode, args); |
| } else { |
| xs = *(args++); /* set selection from kernel */ |
| ys = *(args++); |
| xe = *(args++); |
| ye = *(args++); |
| sel_mode = *args; |
| } |
| xs--; ys--; xe--; ye--; |
| xs = limit(xs, video_num_columns - 1); |
| ys = limit(ys, video_num_lines - 1); |
| xe = limit(xe, video_num_columns - 1); |
| ye = limit(ye, video_num_lines - 1); |
| ps = ys * video_size_row + (xs << 1); |
| pe = ye * video_size_row + (xe << 1); |
| |
| if (sel_mode == 4) { |
| /* useful for screendump without selection highlights */ |
| clear_selection(); |
| return 0; |
| } |
| |
| if (mouse_reporting() && (sel_mode & 16)) { |
| mouse_report(tty, sel_mode & 15, xs, ys); |
| return 0; |
| } |
| } |
| |
| if (ps > pe) /* make sel_start <= sel_end */ |
| { |
| int tmp = ps; |
| ps = pe; |
| pe = tmp; |
| } |
| |
| if (sel_cons != fg_console) { |
| clear_selection(); |
| sel_cons = fg_console; |
| } |
| |
| switch (sel_mode) |
| { |
| case 0: /* character-by-character selection */ |
| new_sel_start = ps; |
| new_sel_end = pe; |
| break; |
| case 1: /* 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 % video_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) % video_size_row)) |
| break; |
| } |
| break; |
| case 2: /* line-by-line selection */ |
| new_sel_start = ps - ps % video_size_row; |
| new_sel_end = pe + video_size_row |
| - pe % video_size_row - 2; |
| break; |
| case 3: |
| 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, video_size_row) && |
| isspace(sel_pos(new_sel_end))) { |
| for (pe = new_sel_end + 2; ; pe += 2) |
| if (!isspace(sel_pos(pe)) || |
| atedge(pe, video_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 ... */ |
| bp = kmalloc((sel_end-sel_start)/2+1, GFP_KERNEL); |
| if (!bp) { |
| printk(KERN_WARNING "selection: kmalloc() failed\n"); |
| clear_selection(); |
| return -ENOMEM; |
| } |
| if (sel_buffer) |
| kfree(sel_buffer); |
| sel_buffer = bp; |
| |
| obp = bp; |
| for (i = sel_start; i <= sel_end; i += 2) { |
| *bp = sel_pos(i); |
| if (!isspace(*bp++)) |
| obp = bp; |
| if (! ((i + 2) % video_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 vt_struct *vt = (struct vt_struct *) tty->driver_data; |
| int pasted = 0, count; |
| struct tty_ldisc *ld; |
| DECLARE_WAITQUEUE(wait, current); |
| |
| poke_blanked_console(); |
| ld = tty_ldisc_ref_wait(tty); |
| add_wait_queue(&vt->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, ld->receive_room(tty)); |
| ld->receive_buf(tty, sel_buffer + pasted, 0, count); |
| pasted += count; |
| } |
| remove_wait_queue(&vt->paste_wait, &wait); |
| current->state = TASK_RUNNING; |
| |
| tty_ldisc_deref(ld); |
| return 0; |
| } |
| |
| EXPORT_SYMBOL(set_selection); |
| EXPORT_SYMBOL(paste_selection); |