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1626 |
jcastillo |
/*
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* linux/drivers/char/selection.c
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*
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* This module exports the functions:
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*
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* 'int set_selection(const unsigned long arg)'
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* 'void clear_selection(void)'
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* 'int paste_selection(struct tty_struct *tty)'
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* 'int sel_loadlut(const unsigned long arg)'
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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/tty.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/malloc.h>
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#include <linux/types.h>
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#include <asm/segment.h>
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#include "vt_kern.h"
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#include "consolemap.h"
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#include "selection.h"
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#ifndef MIN
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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#endif
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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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/* Variables for selection control. */
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/* Use a dynamic buffer, instead of static (Dec 1994) */
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int sel_cons = 0; /* must not be disallocated */
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static volatile int sel_start = -1; /* cleared by clear_selection */
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static int sel_end;
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static int sel_buffer_lth = 0;
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static char *sel_buffer = NULL;
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#define sel_pos(n) inverse_translate(scrw2glyph(screen_word(sel_cons, n, 1)))
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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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inline static void
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highlight(const int s, const int e) {
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invert_screen(sel_cons, s, e-s+2, 1);
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}
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/* use complementary color to show the pointer */
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inline static void
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highlight_pointer(const int where) {
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complement_pos(sel_cons, where);
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}
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/* remove the current selection highlight, if any,
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from the console holding the selection. */
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void
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clear_selection(void) {
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highlight_pointer(-1); /* hide the pointer */
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if (sel_start != -1) {
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highlight(sel_start, sel_end);
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sel_start = -1;
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}
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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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* 256 bits
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*/
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static u32 inwordLut[8]={
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0x00000000, /* control chars */
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0x03FF0000, /* digits */
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0x87FFFFFE, /* uppercase and '_' */
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0x07FFFFFE, /* lowercase */
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0x00000000,
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0x00000000,
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0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */
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0xFF7FFFFF /* latin-1 accented letters, not division sign */
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};
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static inline int inword(const unsigned char c) {
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return ( inwordLut[c>>5] >> (c & 0x1F) ) & 1;
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}
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/* set inwordLut contents. Invoked by ioctl(). */
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int sel_loadlut(const unsigned long arg)
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{
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int i = verify_area(VERIFY_READ, (char *) arg, 36);
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if (i)
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return i;
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memcpy_fromfs(inwordLut, (u32 *)(arg+4), 32);
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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)
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{
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return (!(p % video_size_row) || !((p + 2) % video_size_row));
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}
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/* constrain v such that v <= u */
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static inline unsigned short limit(const unsigned short v, const unsigned short u)
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{
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/* gcc miscompiles the ?: operator, so don't use it.. */
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if (v > u)
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return u;
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return v;
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}
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/* set the current selection. Invoked by ioctl() or by kernel code. */
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int set_selection(const unsigned long arg, struct tty_struct *tty, int user)
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{
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int sel_mode, new_sel_start, new_sel_end, spc;
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char *bp, *obp;
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int i, ps, pe;
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do_unblank_screen();
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{ unsigned short *args, xs, ys, xe, ye;
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args = (unsigned short *)(arg + 1);
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if (user) {
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int err;
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err = verify_area(VERIFY_READ, args, sizeof(short) * 5);
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if (err)
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return err;
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xs = get_user(args++) - 1;
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ys = get_user(args++) - 1;
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xe = get_user(args++) - 1;
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ye = get_user(args++) - 1;
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sel_mode = get_user(args);
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} else {
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xs = *(args++) - 1; /* set selection from kernel */
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ys = *(args++) - 1;
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xe = *(args++) - 1;
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ye = *(args++) - 1;
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sel_mode = *args;
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}
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xs = limit(xs, video_num_columns - 1);
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ys = limit(ys, video_num_lines - 1);
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xe = limit(xe, video_num_columns - 1);
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ye = limit(ye, video_num_lines - 1);
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ps = ys * video_size_row + (xs << 1);
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pe = ye * video_size_row + (xe << 1);
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if (sel_mode == 4) {
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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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if (mouse_reporting() && (sel_mode & 16)) {
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mouse_report(tty, sel_mode & 15, xs, ys);
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return 0;
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}
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}
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if (ps > pe) /* make sel_start <= sel_end */
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{
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int tmp = ps;
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ps = pe;
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pe = tmp;
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}
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if (sel_cons != fg_console) {
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clear_selection();
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sel_cons = fg_console;
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}
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switch (sel_mode)
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{
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case 0: /* 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 1: /* word-by-word selection */
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spc = isspace(sel_pos(ps));
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for (new_sel_start = ps; ; ps -= 2)
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{
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if ((spc && !isspace(sel_pos(ps))) ||
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(!spc && !inword(sel_pos(ps))))
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break;
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new_sel_start = ps;
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if (!(ps % video_size_row))
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break;
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}
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spc = isspace(sel_pos(pe));
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for (new_sel_end = pe; ; pe += 2)
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{
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if ((spc && !isspace(sel_pos(pe))) ||
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(!spc && !inword(sel_pos(pe))))
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break;
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new_sel_end = pe;
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if (!((pe + 2) % video_size_row))
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break;
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}
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break;
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case 2: /* line-by-line selection */
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new_sel_start = ps - ps % video_size_row;
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new_sel_end = pe + video_size_row
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- pe % video_size_row - 2;
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break;
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case 3:
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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) && isspace(sel_pos(new_sel_end))) {
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for (pe = new_sel_end + 2; ; pe += 2)
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if (!isspace(sel_pos(pe)) || atedge(pe))
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break;
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if (isspace(sel_pos(pe)))
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new_sel_end = pe;
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}
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if (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 == sel_start)
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{
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if (new_sel_end == sel_end) /* no action required */
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return 0;
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else if (new_sel_end > sel_end) /* extend to right */
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highlight(sel_end + 2, new_sel_end);
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else /* contract from right */
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highlight(new_sel_end + 2, sel_end);
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}
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else if (new_sel_end == sel_end)
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{
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if (new_sel_start < sel_start) /* extend to left */
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highlight(new_sel_start, sel_start - 2);
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else /* contract from left */
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highlight(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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sel_start = new_sel_start;
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sel_end = new_sel_end;
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if (sel_buffer)
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kfree(sel_buffer);
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sel_buffer = kmalloc((sel_end-sel_start)/2+1, GFP_KERNEL);
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if (!sel_buffer) {
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printk("selection: kmalloc() failed\n");
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clear_selection();
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return -ENOMEM;
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}
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obp = bp = sel_buffer;
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for (i = sel_start; i <= sel_end; i += 2) {
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*bp = sel_pos(i);
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if (!isspace(*bp++))
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obp = bp;
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if (! ((i + 2) % video_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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sel_buffer_lth = bp - sel_buffer;
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return 0;
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}
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/* Insert the contents of the selection buffer into the queue of the
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tty associated with the current console. Invoked by ioctl(). */
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int paste_selection(struct tty_struct *tty)
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{
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struct wait_queue wait = { current, NULL };
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| 284 |
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char *bp = sel_buffer;
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| 285 |
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int c = sel_buffer_lth;
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| 286 |
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int l;
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struct vt_struct *vt = (struct vt_struct *) tty->driver_data;
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if (!bp || !c)
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return 0;
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| 291 |
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do_unblank_screen();
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add_wait_queue(&vt->paste_wait, &wait);
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do {
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current->state = TASK_INTERRUPTIBLE;
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| 295 |
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if (test_bit(TTY_THROTTLED, &tty->flags)) {
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schedule();
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continue;
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| 298 |
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}
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| 299 |
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l = MIN(c, tty->ldisc.receive_room(tty));
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tty->ldisc.receive_buf(tty, bp, 0, l);
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c -= l;
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bp += l;
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} while (c);
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| 304 |
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remove_wait_queue(&vt->paste_wait, &wait);
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| 305 |
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current->state = TASK_RUNNING;
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| 306 |
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return 0;
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| 307 |
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}
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