1 /* 2 * This module exports the functions: 3 * 4 * 'int set_selection(struct tiocl_selection __user *, struct tty_struct *)' 5 * 'void clear_selection(void)' 6 * 'int paste_selection(struct tty_struct *)' 7 * 'int sel_loadlut(char __user *)' 8 * 9 * Now that /dev/vcs exists, most of this can disappear again. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/tty.h> 14 #include <linux/sched.h> 15 #include <linux/mm.h> 16 #include <linux/slab.h> 17 #include <linux/types.h> 18 19 #include <asm/uaccess.h> 20 21 #include <linux/kbd_kern.h> 22 #include <linux/vt_kern.h> 23 #include <linux/consolemap.h> 24 #include <linux/selection.h> 25 #include <linux/tiocl.h> 26 #include <linux/console.h> 27 28 /* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */ 29 #define isspace(c) ((c) == ' ') 30 31 extern void poke_blanked_console(void); 32 33 /* FIXME: all this needs locking */ 34 /* Variables for selection control. */ 35 /* Use a dynamic buffer, instead of static (Dec 1994) */ 36 struct vc_data *sel_cons; /* must not be deallocated */ 37 static int use_unicode; 38 static volatile int sel_start = -1; /* cleared by clear_selection */ 39 static int sel_end; 40 static int sel_buffer_lth; 41 static char *sel_buffer; 42 43 /* clear_selection, highlight and highlight_pointer can be called 44 from interrupt (via scrollback/front) */ 45 46 /* set reverse video on characters s-e of console with selection. */ 47 static inline void highlight(const int s, const int e) 48 { 49 invert_screen(sel_cons, s, e-s+2, 1); 50 } 51 52 /* use complementary color to show the pointer */ 53 static inline void highlight_pointer(const int where) 54 { 55 complement_pos(sel_cons, where); 56 } 57 58 static u16 59 sel_pos(int n) 60 { 61 return inverse_translate(sel_cons, screen_glyph(sel_cons, n), 62 use_unicode); 63 } 64 65 /* remove the current selection highlight, if any, 66 from the console holding the selection. */ 67 void 68 clear_selection(void) { 69 highlight_pointer(-1); /* hide the pointer */ 70 if (sel_start != -1) { 71 highlight(sel_start, sel_end); 72 sel_start = -1; 73 } 74 } 75 76 /* 77 * User settable table: what characters are to be considered alphabetic? 78 * 256 bits 79 */ 80 static u32 inwordLut[8]={ 81 0x00000000, /* control chars */ 82 0x03FF0000, /* digits */ 83 0x87FFFFFE, /* uppercase and '_' */ 84 0x07FFFFFE, /* lowercase */ 85 0x00000000, 86 0x00000000, 87 0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */ 88 0xFF7FFFFF /* latin-1 accented letters, not division sign */ 89 }; 90 91 static inline int inword(const u16 c) { 92 return c > 0xff || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1); 93 } 94 95 /* set inwordLut contents. Invoked by ioctl(). */ 96 int sel_loadlut(char __user *p) 97 { 98 return copy_from_user(inwordLut, (u32 __user *)(p+4), 32) ? -EFAULT : 0; 99 } 100 101 /* does screen address p correspond to character at LH/RH edge of screen? */ 102 static inline int atedge(const int p, int size_row) 103 { 104 return (!(p % size_row) || !((p + 2) % size_row)); 105 } 106 107 /* constrain v such that v <= u */ 108 static inline unsigned short limit(const unsigned short v, const unsigned short u) 109 { 110 return (v > u) ? u : v; 111 } 112 113 /* stores the char in UTF8 and returns the number of bytes used (1-3) */ 114 static int store_utf8(u16 c, char *p) 115 { 116 if (c < 0x80) { 117 /* 0******* */ 118 p[0] = c; 119 return 1; 120 } else if (c < 0x800) { 121 /* 110***** 10****** */ 122 p[0] = 0xc0 | (c >> 6); 123 p[1] = 0x80 | (c & 0x3f); 124 return 2; 125 } else { 126 /* 1110**** 10****** 10****** */ 127 p[0] = 0xe0 | (c >> 12); 128 p[1] = 0x80 | ((c >> 6) & 0x3f); 129 p[2] = 0x80 | (c & 0x3f); 130 return 3; 131 } 132 } 133 134 /* set the current selection. Invoked by ioctl() or by kernel code. */ 135 int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty) 136 { 137 struct vc_data *vc = vc_cons[fg_console].d; 138 int sel_mode, new_sel_start, new_sel_end, spc; 139 char *bp, *obp; 140 int i, ps, pe, multiplier; 141 u16 c; 142 int mode; 143 144 poke_blanked_console(); 145 146 { unsigned short xs, ys, xe, ye; 147 148 if (!access_ok(VERIFY_READ, sel, sizeof(*sel))) 149 return -EFAULT; 150 __get_user(xs, &sel->xs); 151 __get_user(ys, &sel->ys); 152 __get_user(xe, &sel->xe); 153 __get_user(ye, &sel->ye); 154 __get_user(sel_mode, &sel->sel_mode); 155 xs--; ys--; xe--; ye--; 156 xs = limit(xs, vc->vc_cols - 1); 157 ys = limit(ys, vc->vc_rows - 1); 158 xe = limit(xe, vc->vc_cols - 1); 159 ye = limit(ye, vc->vc_rows - 1); 160 ps = ys * vc->vc_size_row + (xs << 1); 161 pe = ye * vc->vc_size_row + (xe << 1); 162 163 if (sel_mode == TIOCL_SELCLEAR) { 164 /* useful for screendump without selection highlights */ 165 clear_selection(); 166 return 0; 167 } 168 169 if (mouse_reporting() && (sel_mode & TIOCL_SELMOUSEREPORT)) { 170 mouse_report(tty, sel_mode & TIOCL_SELBUTTONMASK, xs, ys); 171 return 0; 172 } 173 } 174 175 if (ps > pe) /* make sel_start <= sel_end */ 176 { 177 int tmp = ps; 178 ps = pe; 179 pe = tmp; 180 } 181 182 if (sel_cons != vc_cons[fg_console].d) { 183 clear_selection(); 184 sel_cons = vc_cons[fg_console].d; 185 } 186 mode = vt_do_kdgkbmode(fg_console); 187 if (mode == K_UNICODE) 188 use_unicode = 1; 189 else 190 use_unicode = 0; 191 192 switch (sel_mode) 193 { 194 case TIOCL_SELCHAR: /* character-by-character selection */ 195 new_sel_start = ps; 196 new_sel_end = pe; 197 break; 198 case TIOCL_SELWORD: /* word-by-word selection */ 199 spc = isspace(sel_pos(ps)); 200 for (new_sel_start = ps; ; ps -= 2) 201 { 202 if ((spc && !isspace(sel_pos(ps))) || 203 (!spc && !inword(sel_pos(ps)))) 204 break; 205 new_sel_start = ps; 206 if (!(ps % vc->vc_size_row)) 207 break; 208 } 209 spc = isspace(sel_pos(pe)); 210 for (new_sel_end = pe; ; pe += 2) 211 { 212 if ((spc && !isspace(sel_pos(pe))) || 213 (!spc && !inword(sel_pos(pe)))) 214 break; 215 new_sel_end = pe; 216 if (!((pe + 2) % vc->vc_size_row)) 217 break; 218 } 219 break; 220 case TIOCL_SELLINE: /* line-by-line selection */ 221 new_sel_start = ps - ps % vc->vc_size_row; 222 new_sel_end = pe + vc->vc_size_row 223 - pe % vc->vc_size_row - 2; 224 break; 225 case TIOCL_SELPOINTER: 226 highlight_pointer(pe); 227 return 0; 228 default: 229 return -EINVAL; 230 } 231 232 /* remove the pointer */ 233 highlight_pointer(-1); 234 235 /* select to end of line if on trailing space */ 236 if (new_sel_end > new_sel_start && 237 !atedge(new_sel_end, vc->vc_size_row) && 238 isspace(sel_pos(new_sel_end))) { 239 for (pe = new_sel_end + 2; ; pe += 2) 240 if (!isspace(sel_pos(pe)) || 241 atedge(pe, vc->vc_size_row)) 242 break; 243 if (isspace(sel_pos(pe))) 244 new_sel_end = pe; 245 } 246 if (sel_start == -1) /* no current selection */ 247 highlight(new_sel_start, new_sel_end); 248 else if (new_sel_start == sel_start) 249 { 250 if (new_sel_end == sel_end) /* no action required */ 251 return 0; 252 else if (new_sel_end > sel_end) /* extend to right */ 253 highlight(sel_end + 2, new_sel_end); 254 else /* contract from right */ 255 highlight(new_sel_end + 2, sel_end); 256 } 257 else if (new_sel_end == sel_end) 258 { 259 if (new_sel_start < sel_start) /* extend to left */ 260 highlight(new_sel_start, sel_start - 2); 261 else /* contract from left */ 262 highlight(sel_start, new_sel_start - 2); 263 } 264 else /* some other case; start selection from scratch */ 265 { 266 clear_selection(); 267 highlight(new_sel_start, new_sel_end); 268 } 269 sel_start = new_sel_start; 270 sel_end = new_sel_end; 271 272 /* Allocate a new buffer before freeing the old one ... */ 273 multiplier = use_unicode ? 3 : 1; /* chars can take up to 3 bytes */ 274 bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL); 275 if (!bp) { 276 printk(KERN_WARNING "selection: kmalloc() failed\n"); 277 clear_selection(); 278 return -ENOMEM; 279 } 280 kfree(sel_buffer); 281 sel_buffer = bp; 282 283 obp = bp; 284 for (i = sel_start; i <= sel_end; i += 2) { 285 c = sel_pos(i); 286 if (use_unicode) 287 bp += store_utf8(c, bp); 288 else 289 *bp++ = c; 290 if (!isspace(c)) 291 obp = bp; 292 if (! ((i + 2) % vc->vc_size_row)) { 293 /* strip trailing blanks from line and add newline, 294 unless non-space at end of line. */ 295 if (obp != bp) { 296 bp = obp; 297 *bp++ = '\r'; 298 } 299 obp = bp; 300 } 301 } 302 sel_buffer_lth = bp - sel_buffer; 303 return 0; 304 } 305 306 /* Insert the contents of the selection buffer into the 307 * queue of the tty associated with the current console. 308 * Invoked by ioctl(). 309 * 310 * Locking: always called with BTM from vt_ioctl 311 */ 312 int paste_selection(struct tty_struct *tty) 313 { 314 struct vc_data *vc = tty->driver_data; 315 int pasted = 0; 316 unsigned int count; 317 struct tty_ldisc *ld; 318 DECLARE_WAITQUEUE(wait, current); 319 320 321 console_lock(); 322 poke_blanked_console(); 323 console_unlock(); 324 325 ld = tty_ldisc_ref(tty); 326 if (!ld) { 327 tty_unlock(); 328 ld = tty_ldisc_ref_wait(tty); 329 tty_lock(); 330 } 331 332 add_wait_queue(&vc->paste_wait, &wait); 333 while (sel_buffer && sel_buffer_lth > pasted) { 334 set_current_state(TASK_INTERRUPTIBLE); 335 if (test_bit(TTY_THROTTLED, &tty->flags)) { 336 schedule(); 337 continue; 338 } 339 count = sel_buffer_lth - pasted; 340 count = min(count, tty->receive_room); 341 tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted, 342 NULL, count); 343 pasted += count; 344 } 345 remove_wait_queue(&vc->paste_wait, &wait); 346 __set_current_state(TASK_RUNNING); 347 348 tty_ldisc_deref(ld); 349 return 0; 350 } 351