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 /** 66 * clear_selection - remove current selection 67 * 68 * Remove the current selection highlight, if any from the console 69 * holding the selection. The caller must hold the console lock. 70 */ 71 void clear_selection(void) 72 { 73 highlight_pointer(-1); /* hide the pointer */ 74 if (sel_start != -1) { 75 highlight(sel_start, sel_end); 76 sel_start = -1; 77 } 78 } 79 80 /* 81 * User settable table: what characters are to be considered alphabetic? 82 * 256 bits. Locked by the console lock. 83 */ 84 static u32 inwordLut[8]={ 85 0x00000000, /* control chars */ 86 0x03FF0000, /* digits */ 87 0x87FFFFFE, /* uppercase and '_' */ 88 0x07FFFFFE, /* lowercase */ 89 0x00000000, 90 0x00000000, 91 0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */ 92 0xFF7FFFFF /* latin-1 accented letters, not division sign */ 93 }; 94 95 static inline int inword(const u16 c) { 96 return c > 0xff || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1); 97 } 98 99 /** 100 * set loadlut - load the LUT table 101 * @p: user table 102 * 103 * Load the LUT table from user space. The caller must hold the console 104 * lock. Make a temporary copy so a partial update doesn't make a mess. 105 */ 106 int sel_loadlut(char __user *p) 107 { 108 u32 tmplut[8]; 109 if (copy_from_user(tmplut, (u32 __user *)(p+4), 32)) 110 return -EFAULT; 111 memcpy(inwordLut, tmplut, 32); 112 return 0; 113 } 114 115 /* does screen address p correspond to character at LH/RH edge of screen? */ 116 static inline int atedge(const int p, int size_row) 117 { 118 return (!(p % size_row) || !((p + 2) % size_row)); 119 } 120 121 /* constrain v such that v <= u */ 122 static inline unsigned short limit(const unsigned short v, const unsigned short u) 123 { 124 return (v > u) ? u : v; 125 } 126 127 /* stores the char in UTF8 and returns the number of bytes used (1-3) */ 128 static int store_utf8(u16 c, char *p) 129 { 130 if (c < 0x80) { 131 /* 0******* */ 132 p[0] = c; 133 return 1; 134 } else if (c < 0x800) { 135 /* 110***** 10****** */ 136 p[0] = 0xc0 | (c >> 6); 137 p[1] = 0x80 | (c & 0x3f); 138 return 2; 139 } else { 140 /* 1110**** 10****** 10****** */ 141 p[0] = 0xe0 | (c >> 12); 142 p[1] = 0x80 | ((c >> 6) & 0x3f); 143 p[2] = 0x80 | (c & 0x3f); 144 return 3; 145 } 146 } 147 148 /** 149 * set_selection - set the current selection. 150 * @sel: user selection info 151 * @tty: the console tty 152 * 153 * Invoked by the ioctl handle for the vt layer. 154 * 155 * The entire selection process is managed under the console_lock. It's 156 * a lot under the lock but its hardly a performance path 157 */ 158 int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty) 159 { 160 struct vc_data *vc = vc_cons[fg_console].d; 161 int sel_mode, new_sel_start, new_sel_end, spc; 162 char *bp, *obp; 163 int i, ps, pe, multiplier; 164 u16 c; 165 int mode; 166 167 poke_blanked_console(); 168 169 { unsigned short xs, ys, xe, ye; 170 171 if (!access_ok(VERIFY_READ, sel, sizeof(*sel))) 172 return -EFAULT; 173 __get_user(xs, &sel->xs); 174 __get_user(ys, &sel->ys); 175 __get_user(xe, &sel->xe); 176 __get_user(ye, &sel->ye); 177 __get_user(sel_mode, &sel->sel_mode); 178 xs--; ys--; xe--; ye--; 179 xs = limit(xs, vc->vc_cols - 1); 180 ys = limit(ys, vc->vc_rows - 1); 181 xe = limit(xe, vc->vc_cols - 1); 182 ye = limit(ye, vc->vc_rows - 1); 183 ps = ys * vc->vc_size_row + (xs << 1); 184 pe = ye * vc->vc_size_row + (xe << 1); 185 186 if (sel_mode == TIOCL_SELCLEAR) { 187 /* useful for screendump without selection highlights */ 188 clear_selection(); 189 return 0; 190 } 191 192 if (mouse_reporting() && (sel_mode & TIOCL_SELMOUSEREPORT)) { 193 mouse_report(tty, sel_mode & TIOCL_SELBUTTONMASK, xs, ys); 194 return 0; 195 } 196 } 197 198 if (ps > pe) /* make sel_start <= sel_end */ 199 { 200 int tmp = ps; 201 ps = pe; 202 pe = tmp; 203 } 204 205 if (sel_cons != vc_cons[fg_console].d) { 206 clear_selection(); 207 sel_cons = vc_cons[fg_console].d; 208 } 209 mode = vt_do_kdgkbmode(fg_console); 210 if (mode == K_UNICODE) 211 use_unicode = 1; 212 else 213 use_unicode = 0; 214 215 switch (sel_mode) 216 { 217 case TIOCL_SELCHAR: /* character-by-character selection */ 218 new_sel_start = ps; 219 new_sel_end = pe; 220 break; 221 case TIOCL_SELWORD: /* word-by-word selection */ 222 spc = isspace(sel_pos(ps)); 223 for (new_sel_start = ps; ; ps -= 2) 224 { 225 if ((spc && !isspace(sel_pos(ps))) || 226 (!spc && !inword(sel_pos(ps)))) 227 break; 228 new_sel_start = ps; 229 if (!(ps % vc->vc_size_row)) 230 break; 231 } 232 spc = isspace(sel_pos(pe)); 233 for (new_sel_end = pe; ; pe += 2) 234 { 235 if ((spc && !isspace(sel_pos(pe))) || 236 (!spc && !inword(sel_pos(pe)))) 237 break; 238 new_sel_end = pe; 239 if (!((pe + 2) % vc->vc_size_row)) 240 break; 241 } 242 break; 243 case TIOCL_SELLINE: /* line-by-line selection */ 244 new_sel_start = ps - ps % vc->vc_size_row; 245 new_sel_end = pe + vc->vc_size_row 246 - pe % vc->vc_size_row - 2; 247 break; 248 case TIOCL_SELPOINTER: 249 highlight_pointer(pe); 250 return 0; 251 default: 252 return -EINVAL; 253 } 254 255 /* remove the pointer */ 256 highlight_pointer(-1); 257 258 /* select to end of line if on trailing space */ 259 if (new_sel_end > new_sel_start && 260 !atedge(new_sel_end, vc->vc_size_row) && 261 isspace(sel_pos(new_sel_end))) { 262 for (pe = new_sel_end + 2; ; pe += 2) 263 if (!isspace(sel_pos(pe)) || 264 atedge(pe, vc->vc_size_row)) 265 break; 266 if (isspace(sel_pos(pe))) 267 new_sel_end = pe; 268 } 269 if (sel_start == -1) /* no current selection */ 270 highlight(new_sel_start, new_sel_end); 271 else if (new_sel_start == sel_start) 272 { 273 if (new_sel_end == sel_end) /* no action required */ 274 return 0; 275 else if (new_sel_end > sel_end) /* extend to right */ 276 highlight(sel_end + 2, new_sel_end); 277 else /* contract from right */ 278 highlight(new_sel_end + 2, sel_end); 279 } 280 else if (new_sel_end == sel_end) 281 { 282 if (new_sel_start < sel_start) /* extend to left */ 283 highlight(new_sel_start, sel_start - 2); 284 else /* contract from left */ 285 highlight(sel_start, new_sel_start - 2); 286 } 287 else /* some other case; start selection from scratch */ 288 { 289 clear_selection(); 290 highlight(new_sel_start, new_sel_end); 291 } 292 sel_start = new_sel_start; 293 sel_end = new_sel_end; 294 295 /* Allocate a new buffer before freeing the old one ... */ 296 multiplier = use_unicode ? 3 : 1; /* chars can take up to 3 bytes */ 297 bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL); 298 if (!bp) { 299 printk(KERN_WARNING "selection: kmalloc() failed\n"); 300 clear_selection(); 301 return -ENOMEM; 302 } 303 kfree(sel_buffer); 304 sel_buffer = bp; 305 306 obp = bp; 307 for (i = sel_start; i <= sel_end; i += 2) { 308 c = sel_pos(i); 309 if (use_unicode) 310 bp += store_utf8(c, bp); 311 else 312 *bp++ = c; 313 if (!isspace(c)) 314 obp = bp; 315 if (! ((i + 2) % vc->vc_size_row)) { 316 /* strip trailing blanks from line and add newline, 317 unless non-space at end of line. */ 318 if (obp != bp) { 319 bp = obp; 320 *bp++ = '\r'; 321 } 322 obp = bp; 323 } 324 } 325 sel_buffer_lth = bp - sel_buffer; 326 return 0; 327 } 328 329 /* Insert the contents of the selection buffer into the 330 * queue of the tty associated with the current console. 331 * Invoked by ioctl(). 332 * 333 * Locking: called without locks. Calls the ldisc wrongly with 334 * unsafe methods, 335 */ 336 int paste_selection(struct tty_struct *tty) 337 { 338 struct vc_data *vc = tty->driver_data; 339 int pasted = 0; 340 unsigned int count; 341 struct tty_ldisc *ld; 342 DECLARE_WAITQUEUE(wait, current); 343 344 345 console_lock(); 346 poke_blanked_console(); 347 console_unlock(); 348 349 /* FIXME: wtf is this supposed to achieve ? */ 350 ld = tty_ldisc_ref(tty); 351 if (!ld) 352 ld = tty_ldisc_ref_wait(tty); 353 354 /* FIXME: this is completely unsafe */ 355 add_wait_queue(&vc->paste_wait, &wait); 356 while (sel_buffer && sel_buffer_lth > pasted) { 357 set_current_state(TASK_INTERRUPTIBLE); 358 if (test_bit(TTY_THROTTLED, &tty->flags)) { 359 schedule(); 360 continue; 361 } 362 count = sel_buffer_lth - pasted; 363 count = min(count, tty->receive_room); 364 tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted, 365 NULL, count); 366 pasted += count; 367 } 368 remove_wait_queue(&vc->paste_wait, &wait); 369 __set_current_state(TASK_RUNNING); 370 371 tty_ldisc_deref(ld); 372 return 0; 373 } 374