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