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