Todd Fiala | 12e2168 | 2013-10-30 10:02:25 -0700 | [diff] [blame] | 1 | /* $NetBSD: refresh.c,v 1.37 2011/07/29 23:44:45 christos Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1992, 1993 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to Berkeley by |
| 8 | * Christos Zoulas of Cornell University. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. Neither the name of the University nor the names of its contributors |
| 19 | * may be used to endorse or promote products derived from this software |
| 20 | * without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | #include "config.h" |
| 36 | #if !defined(lint) && !defined(SCCSID) |
| 37 | #if 0 |
| 38 | static char sccsid[] = "@(#)refresh.c 8.1 (Berkeley) 6/4/93"; |
| 39 | #else |
| 40 | __RCSID("$NetBSD: refresh.c,v 1.37 2011/07/29 23:44:45 christos Exp $"); |
| 41 | #endif |
| 42 | #endif /* not lint && not SCCSID */ |
| 43 | |
| 44 | /* |
| 45 | * refresh.c: Lower level screen refreshing functions |
| 46 | */ |
| 47 | #include <stdio.h> |
| 48 | #include <ctype.h> |
| 49 | #include <unistd.h> |
| 50 | #include <string.h> |
| 51 | |
| 52 | #include "el.h" |
| 53 | |
| 54 | private void re_nextline(EditLine *); |
| 55 | private void re_addc(EditLine *, Int); |
| 56 | private void re_update_line(EditLine *, Char *, Char *, int); |
| 57 | private void re_insert (EditLine *, Char *, int, int, Char *, int); |
| 58 | private void re_delete(EditLine *, Char *, int, int, int); |
| 59 | private void re_fastputc(EditLine *, Int); |
| 60 | private void re_clear_eol(EditLine *, int, int, int); |
| 61 | private void re__strncopy(Char *, Char *, size_t); |
| 62 | private void re__copy_and_pad(Char *, const Char *, size_t); |
| 63 | |
| 64 | #ifdef DEBUG_REFRESH |
| 65 | private void re_printstr(EditLine *, const char *, char *, char *); |
| 66 | #define __F el->el_errfile |
| 67 | #define ELRE_ASSERT(a, b, c) do \ |
| 68 | if (/*CONSTCOND*/ a) { \ |
| 69 | (void) fprintf b; \ |
| 70 | c; \ |
| 71 | } \ |
| 72 | while (/*CONSTCOND*/0) |
| 73 | #define ELRE_DEBUG(a, b) ELRE_ASSERT(a,b,;) |
| 74 | |
| 75 | /* re_printstr(): |
| 76 | * Print a string on the debugging pty |
| 77 | */ |
| 78 | private void |
| 79 | re_printstr(EditLine *el, const char *str, char *f, char *t) |
| 80 | { |
| 81 | |
| 82 | ELRE_DEBUG(1, (__F, "%s:\"", str)); |
| 83 | while (f < t) |
| 84 | ELRE_DEBUG(1, (__F, "%c", *f++ & 0177)); |
| 85 | ELRE_DEBUG(1, (__F, "\"\r\n")); |
| 86 | } |
| 87 | #else |
| 88 | #define ELRE_ASSERT(a, b, c) |
| 89 | #define ELRE_DEBUG(a, b) |
| 90 | #endif |
| 91 | |
| 92 | /* re_nextline(): |
| 93 | * Move to the next line or scroll |
| 94 | */ |
| 95 | private void |
| 96 | re_nextline(EditLine *el) |
| 97 | { |
| 98 | el->el_refresh.r_cursor.h = 0; /* reset it. */ |
| 99 | |
| 100 | /* |
| 101 | * If we would overflow (input is longer than terminal size), |
| 102 | * emulate scroll by dropping first line and shuffling the rest. |
| 103 | * We do this via pointer shuffling - it's safe in this case |
| 104 | * and we avoid memcpy(). |
| 105 | */ |
| 106 | if (el->el_refresh.r_cursor.v + 1 >= el->el_terminal.t_size.v) { |
| 107 | int i, lins = el->el_terminal.t_size.v; |
| 108 | Char *firstline = el->el_vdisplay[0]; |
| 109 | |
| 110 | for(i = 1; i < lins; i++) |
| 111 | el->el_vdisplay[i - 1] = el->el_vdisplay[i]; |
| 112 | |
| 113 | firstline[0] = '\0'; /* empty the string */ |
| 114 | el->el_vdisplay[i - 1] = firstline; |
| 115 | } else |
| 116 | el->el_refresh.r_cursor.v++; |
| 117 | |
| 118 | ELRE_ASSERT(el->el_refresh.r_cursor.v >= el->el_terminal.t_size.v, |
| 119 | (__F, "\r\nre_putc: overflow! r_cursor.v == %d > %d\r\n", |
| 120 | el->el_refresh.r_cursor.v, el->el_terminal.t_size.v), |
| 121 | abort()); |
| 122 | } |
| 123 | |
| 124 | /* re_addc(): |
| 125 | * Draw c, expanding tabs, control chars etc. |
| 126 | */ |
| 127 | private void |
| 128 | re_addc(EditLine *el, Int c) |
| 129 | { |
| 130 | switch (ct_chr_class((Char)c)) { |
| 131 | case CHTYPE_TAB: /* expand the tab */ |
| 132 | for (;;) { |
| 133 | re_putc(el, ' ', 1); |
| 134 | if ((el->el_refresh.r_cursor.h & 07) == 0) |
| 135 | break; /* go until tab stop */ |
| 136 | } |
| 137 | break; |
| 138 | case CHTYPE_NL: { |
| 139 | int oldv = el->el_refresh.r_cursor.v; |
| 140 | re_putc(el, '\0', 0); /* assure end of line */ |
| 141 | if (oldv == el->el_refresh.r_cursor.v) /* XXX */ |
| 142 | re_nextline(el); |
| 143 | break; |
| 144 | } |
| 145 | case CHTYPE_PRINT: |
| 146 | re_putc(el, c, 1); |
| 147 | break; |
| 148 | default: { |
| 149 | Char visbuf[VISUAL_WIDTH_MAX]; |
| 150 | ssize_t i, n = |
| 151 | ct_visual_char(visbuf, VISUAL_WIDTH_MAX, (Char)c); |
| 152 | for (i = 0; n-- > 0; ++i) |
| 153 | re_putc(el, visbuf[i], 1); |
| 154 | break; |
| 155 | } |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | |
| 160 | /* re_putc(): |
| 161 | * Draw the character given |
| 162 | */ |
| 163 | protected void |
| 164 | re_putc(EditLine *el, Int c, int shift) |
| 165 | { |
| 166 | int i, w = Width(c); |
| 167 | ELRE_DEBUG(1, (__F, "printing %5x '%c'\r\n", c, c)); |
| 168 | |
| 169 | while (shift && (el->el_refresh.r_cursor.h + w > el->el_terminal.t_size.h)) |
| 170 | re_putc(el, ' ', 1); |
| 171 | |
| 172 | el->el_vdisplay[el->el_refresh.r_cursor.v] |
| 173 | [el->el_refresh.r_cursor.h] = c; |
| 174 | /* assumes !shift is only used for single-column chars */ |
| 175 | i = w; |
| 176 | while (--i > 0) |
| 177 | el->el_vdisplay[el->el_refresh.r_cursor.v] |
| 178 | [el->el_refresh.r_cursor.h + i] = MB_FILL_CHAR; |
| 179 | |
| 180 | if (!shift) |
| 181 | return; |
| 182 | |
| 183 | el->el_refresh.r_cursor.h += w; /* advance to next place */ |
| 184 | if (el->el_refresh.r_cursor.h >= el->el_terminal.t_size.h) { |
| 185 | /* assure end of line */ |
| 186 | el->el_vdisplay[el->el_refresh.r_cursor.v][el->el_terminal.t_size.h] |
| 187 | = '\0'; |
| 188 | re_nextline(el); |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | |
| 193 | /* re_refresh(): |
| 194 | * draws the new virtual screen image from the current input |
| 195 | * line, then goes line-by-line changing the real image to the new |
| 196 | * virtual image. The routine to re-draw a line can be replaced |
| 197 | * easily in hopes of a smarter one being placed there. |
| 198 | */ |
| 199 | protected void |
| 200 | re_refresh(EditLine *el) |
| 201 | { |
| 202 | int i, rhdiff; |
| 203 | Char *cp, *st; |
| 204 | coord_t cur; |
| 205 | #ifdef notyet |
| 206 | size_t termsz; |
| 207 | #endif |
| 208 | |
| 209 | ELRE_DEBUG(1, (__F, "el->el_line.buffer = :%s:\r\n", |
| 210 | el->el_line.buffer)); |
| 211 | |
| 212 | /* reset the Drawing cursor */ |
| 213 | el->el_refresh.r_cursor.h = 0; |
| 214 | el->el_refresh.r_cursor.v = 0; |
| 215 | |
| 216 | /* temporarily draw rprompt to calculate its size */ |
| 217 | prompt_print(el, EL_RPROMPT); |
| 218 | |
| 219 | /* reset the Drawing cursor */ |
| 220 | el->el_refresh.r_cursor.h = 0; |
| 221 | el->el_refresh.r_cursor.v = 0; |
| 222 | |
| 223 | if (el->el_line.cursor >= el->el_line.lastchar) { |
| 224 | if (el->el_map.current == el->el_map.alt |
| 225 | && el->el_line.lastchar != el->el_line.buffer) |
| 226 | el->el_line.cursor = el->el_line.lastchar - 1; |
| 227 | else |
| 228 | el->el_line.cursor = el->el_line.lastchar; |
| 229 | } |
| 230 | |
| 231 | cur.h = -1; /* set flag in case I'm not set */ |
| 232 | cur.v = 0; |
| 233 | |
| 234 | prompt_print(el, EL_PROMPT); |
| 235 | |
| 236 | /* draw the current input buffer */ |
| 237 | #if notyet |
| 238 | termsz = el->el_terminal.t_size.h * el->el_terminal.t_size.v; |
| 239 | if (el->el_line.lastchar - el->el_line.buffer > termsz) { |
| 240 | /* |
| 241 | * If line is longer than terminal, process only part |
| 242 | * of line which would influence display. |
| 243 | */ |
| 244 | size_t rem = (el->el_line.lastchar-el->el_line.buffer)%termsz; |
| 245 | |
| 246 | st = el->el_line.lastchar - rem |
| 247 | - (termsz - (((rem / el->el_terminal.t_size.v) - 1) |
| 248 | * el->el_terminal.t_size.v)); |
| 249 | } else |
| 250 | #endif |
| 251 | st = el->el_line.buffer; |
| 252 | |
| 253 | for (cp = st; cp < el->el_line.lastchar; cp++) { |
| 254 | if (cp == el->el_line.cursor) { |
| 255 | int w = Width(*cp); |
| 256 | /* save for later */ |
| 257 | cur.h = el->el_refresh.r_cursor.h; |
| 258 | cur.v = el->el_refresh.r_cursor.v; |
| 259 | /* handle being at a linebroken doublewidth char */ |
| 260 | if (w > 1 && el->el_refresh.r_cursor.h + w > |
| 261 | el->el_terminal.t_size.h) { |
| 262 | cur.h = 0; |
| 263 | cur.v++; |
| 264 | } |
| 265 | } |
| 266 | re_addc(el, *cp); |
| 267 | } |
| 268 | |
| 269 | if (cur.h == -1) { /* if I haven't been set yet, I'm at the end */ |
| 270 | cur.h = el->el_refresh.r_cursor.h; |
| 271 | cur.v = el->el_refresh.r_cursor.v; |
| 272 | } |
| 273 | rhdiff = el->el_terminal.t_size.h - el->el_refresh.r_cursor.h - |
| 274 | el->el_rprompt.p_pos.h; |
| 275 | if (el->el_rprompt.p_pos.h && !el->el_rprompt.p_pos.v && |
| 276 | !el->el_refresh.r_cursor.v && rhdiff > 1) { |
| 277 | /* |
| 278 | * have a right-hand side prompt that will fit |
| 279 | * on the end of the first line with at least |
| 280 | * one character gap to the input buffer. |
| 281 | */ |
| 282 | while (--rhdiff > 0) /* pad out with spaces */ |
| 283 | re_putc(el, ' ', 1); |
| 284 | prompt_print(el, EL_RPROMPT); |
| 285 | } else { |
| 286 | el->el_rprompt.p_pos.h = 0; /* flag "not using rprompt" */ |
| 287 | el->el_rprompt.p_pos.v = 0; |
| 288 | } |
| 289 | |
| 290 | re_putc(el, '\0', 0); /* make line ended with NUL, no cursor shift */ |
| 291 | |
| 292 | el->el_refresh.r_newcv = el->el_refresh.r_cursor.v; |
| 293 | |
| 294 | ELRE_DEBUG(1, (__F, |
| 295 | "term.h=%d vcur.h=%d vcur.v=%d vdisplay[0]=\r\n:%80.80s:\r\n", |
| 296 | el->el_terminal.t_size.h, el->el_refresh.r_cursor.h, |
| 297 | el->el_refresh.r_cursor.v, ct_encode_string(el->el_vdisplay[0]))); |
| 298 | |
| 299 | ELRE_DEBUG(1, (__F, "updating %d lines.\r\n", el->el_refresh.r_newcv)); |
| 300 | for (i = 0; i <= el->el_refresh.r_newcv; i++) { |
| 301 | /* NOTE THAT re_update_line MAY CHANGE el_display[i] */ |
| 302 | re_update_line(el, el->el_display[i], el->el_vdisplay[i], i); |
| 303 | |
| 304 | /* |
| 305 | * Copy the new line to be the current one, and pad out with |
| 306 | * spaces to the full width of the terminal so that if we try |
| 307 | * moving the cursor by writing the character that is at the |
| 308 | * end of the screen line, it won't be a NUL or some old |
| 309 | * leftover stuff. |
| 310 | */ |
| 311 | re__copy_and_pad(el->el_display[i], el->el_vdisplay[i], |
| 312 | (size_t) el->el_terminal.t_size.h); |
| 313 | } |
| 314 | ELRE_DEBUG(1, (__F, |
| 315 | "\r\nel->el_refresh.r_cursor.v=%d,el->el_refresh.r_oldcv=%d i=%d\r\n", |
| 316 | el->el_refresh.r_cursor.v, el->el_refresh.r_oldcv, i)); |
| 317 | |
| 318 | if (el->el_refresh.r_oldcv > el->el_refresh.r_newcv) |
| 319 | for (; i <= el->el_refresh.r_oldcv; i++) { |
| 320 | terminal_move_to_line(el, i); |
| 321 | terminal_move_to_char(el, 0); |
| 322 | /* This Strlen should be safe even with MB_FILL_CHARs */ |
| 323 | terminal_clear_EOL(el, (int) Strlen(el->el_display[i])); |
| 324 | #ifdef DEBUG_REFRESH |
| 325 | terminal_overwrite(el, "C\b", (size_t)2); |
| 326 | #endif /* DEBUG_REFRESH */ |
| 327 | el->el_display[i][0] = '\0'; |
| 328 | } |
| 329 | |
| 330 | el->el_refresh.r_oldcv = el->el_refresh.r_newcv; /* set for next time */ |
| 331 | ELRE_DEBUG(1, (__F, |
| 332 | "\r\ncursor.h = %d, cursor.v = %d, cur.h = %d, cur.v = %d\r\n", |
| 333 | el->el_refresh.r_cursor.h, el->el_refresh.r_cursor.v, |
| 334 | cur.h, cur.v)); |
| 335 | terminal_move_to_line(el, cur.v); /* go to where the cursor is */ |
| 336 | terminal_move_to_char(el, cur.h); |
| 337 | } |
| 338 | |
| 339 | |
| 340 | /* re_goto_bottom(): |
| 341 | * used to go to last used screen line |
| 342 | */ |
| 343 | protected void |
| 344 | re_goto_bottom(EditLine *el) |
| 345 | { |
| 346 | |
| 347 | terminal_move_to_line(el, el->el_refresh.r_oldcv); |
| 348 | terminal__putc(el, '\n'); |
| 349 | re_clear_display(el); |
| 350 | terminal__flush(el); |
| 351 | } |
| 352 | |
| 353 | |
| 354 | /* re_insert(): |
| 355 | * insert num characters of s into d (in front of the character) |
| 356 | * at dat, maximum length of d is dlen |
| 357 | */ |
| 358 | private void |
| 359 | /*ARGSUSED*/ |
| 360 | re_insert(EditLine *el __attribute__((__unused__)), |
| 361 | Char *d, int dat, int dlen, Char *s, int num) |
| 362 | { |
| 363 | Char *a, *b; |
| 364 | |
| 365 | if (num <= 0) |
| 366 | return; |
| 367 | if (num > dlen - dat) |
| 368 | num = dlen - dat; |
| 369 | |
| 370 | ELRE_DEBUG(1, |
| 371 | (__F, "re_insert() starting: %d at %d max %d, d == \"%s\"\n", |
| 372 | num, dat, dlen, ct_encode_string(d))); |
| 373 | ELRE_DEBUG(1, (__F, "s == \"%s\"\n", ct_encode_string(s))); |
| 374 | |
| 375 | /* open up the space for num chars */ |
| 376 | if (num > 0) { |
| 377 | b = d + dlen - 1; |
| 378 | a = b - num; |
| 379 | while (a >= &d[dat]) |
| 380 | *b-- = *a--; |
| 381 | d[dlen] = '\0'; /* just in case */ |
| 382 | } |
| 383 | |
| 384 | ELRE_DEBUG(1, (__F, |
| 385 | "re_insert() after insert: %d at %d max %d, d == \"%s\"\n", |
| 386 | num, dat, dlen, ct_encode_string(d))); |
| 387 | ELRE_DEBUG(1, (__F, "s == \"%s\"\n", ct_encode_string(s))); |
| 388 | |
| 389 | /* copy the characters */ |
| 390 | for (a = d + dat; (a < d + dlen) && (num > 0); num--) |
| 391 | *a++ = *s++; |
| 392 | |
| 393 | #ifdef notyet |
| 394 | /* ct_encode_string() uses a static buffer, so we can't conveniently |
| 395 | * encode both d & s here */ |
| 396 | ELRE_DEBUG(1, |
| 397 | (__F, "re_insert() after copy: %d at %d max %d, %s == \"%s\"\n", |
| 398 | num, dat, dlen, d, s)); |
| 399 | ELRE_DEBUG(1, (__F, "s == \"%s\"\n", s)); |
| 400 | #endif |
| 401 | } |
| 402 | |
| 403 | |
| 404 | /* re_delete(): |
| 405 | * delete num characters d at dat, maximum length of d is dlen |
| 406 | */ |
| 407 | private void |
| 408 | /*ARGSUSED*/ |
| 409 | re_delete(EditLine *el __attribute__((__unused__)), |
| 410 | Char *d, int dat, int dlen, int num) |
| 411 | { |
| 412 | Char *a, *b; |
| 413 | |
| 414 | if (num <= 0) |
| 415 | return; |
| 416 | if (dat + num >= dlen) { |
| 417 | d[dat] = '\0'; |
| 418 | return; |
| 419 | } |
| 420 | ELRE_DEBUG(1, |
| 421 | (__F, "re_delete() starting: %d at %d max %d, d == \"%s\"\n", |
| 422 | num, dat, dlen, ct_encode_string(d))); |
| 423 | |
| 424 | /* open up the space for num chars */ |
| 425 | if (num > 0) { |
| 426 | b = d + dat; |
| 427 | a = b + num; |
| 428 | while (a < &d[dlen]) |
| 429 | *b++ = *a++; |
| 430 | d[dlen] = '\0'; /* just in case */ |
| 431 | } |
| 432 | ELRE_DEBUG(1, |
| 433 | (__F, "re_delete() after delete: %d at %d max %d, d == \"%s\"\n", |
| 434 | num, dat, dlen, ct_encode_string(d))); |
| 435 | } |
| 436 | |
| 437 | |
| 438 | /* re__strncopy(): |
| 439 | * Like strncpy without padding. |
| 440 | */ |
| 441 | private void |
| 442 | re__strncopy(Char *a, Char *b, size_t n) |
| 443 | { |
| 444 | |
| 445 | while (n-- && *b) |
| 446 | *a++ = *b++; |
| 447 | } |
| 448 | |
| 449 | /* re_clear_eol(): |
| 450 | * Find the number of characters we need to clear till the end of line |
| 451 | * in order to make sure that we have cleared the previous contents of |
| 452 | * the line. fx and sx is the number of characters inserted or deleted |
| 453 | * in the first or second diff, diff is the difference between the |
| 454 | * number of characters between the new and old line. |
| 455 | */ |
| 456 | private void |
| 457 | re_clear_eol(EditLine *el, int fx, int sx, int diff) |
| 458 | { |
| 459 | |
| 460 | ELRE_DEBUG(1, (__F, "re_clear_eol sx %d, fx %d, diff %d\n", |
| 461 | sx, fx, diff)); |
| 462 | |
| 463 | if (fx < 0) |
| 464 | fx = -fx; |
| 465 | if (sx < 0) |
| 466 | sx = -sx; |
| 467 | if (fx > diff) |
| 468 | diff = fx; |
| 469 | if (sx > diff) |
| 470 | diff = sx; |
| 471 | |
| 472 | ELRE_DEBUG(1, (__F, "re_clear_eol %d\n", diff)); |
| 473 | terminal_clear_EOL(el, diff); |
| 474 | } |
| 475 | |
| 476 | /***************************************************************** |
| 477 | re_update_line() is based on finding the middle difference of each line |
| 478 | on the screen; vis: |
| 479 | |
| 480 | /old first difference |
| 481 | /beginning of line | /old last same /old EOL |
| 482 | v v v v |
| 483 | old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as |
| 484 | new: eddie> Oh, my little buggy says to me, as lurgid as |
| 485 | ^ ^ ^ ^ |
| 486 | \beginning of line | \new last same \new end of line |
| 487 | \new first difference |
| 488 | |
| 489 | all are character pointers for the sake of speed. Special cases for |
| 490 | no differences, as well as for end of line additions must be handled. |
| 491 | **************************************************************** */ |
| 492 | |
| 493 | /* Minimum at which doing an insert it "worth it". This should be about |
| 494 | * half the "cost" of going into insert mode, inserting a character, and |
| 495 | * going back out. This should really be calculated from the termcap |
| 496 | * data... For the moment, a good number for ANSI terminals. |
| 497 | */ |
| 498 | #define MIN_END_KEEP 4 |
| 499 | |
| 500 | private void |
| 501 | re_update_line(EditLine *el, Char *old, Char *new, int i) |
| 502 | { |
| 503 | Char *o, *n, *p, c; |
| 504 | Char *ofd, *ols, *oe, *nfd, *nls, *ne; |
| 505 | Char *osb, *ose, *nsb, *nse; |
| 506 | int fx, sx; |
| 507 | size_t len; |
| 508 | |
| 509 | /* |
| 510 | * find first diff |
| 511 | */ |
| 512 | for (o = old, n = new; *o && (*o == *n); o++, n++) |
| 513 | continue; |
| 514 | ofd = o; |
| 515 | nfd = n; |
| 516 | |
| 517 | /* |
| 518 | * Find the end of both old and new |
| 519 | */ |
| 520 | while (*o) |
| 521 | o++; |
| 522 | /* |
| 523 | * Remove any trailing blanks off of the end, being careful not to |
| 524 | * back up past the beginning. |
| 525 | */ |
| 526 | while (ofd < o) { |
| 527 | if (o[-1] != ' ') |
| 528 | break; |
| 529 | o--; |
| 530 | } |
| 531 | oe = o; |
| 532 | *oe = '\0'; |
| 533 | |
| 534 | while (*n) |
| 535 | n++; |
| 536 | |
| 537 | /* remove blanks from end of new */ |
| 538 | while (nfd < n) { |
| 539 | if (n[-1] != ' ') |
| 540 | break; |
| 541 | n--; |
| 542 | } |
| 543 | ne = n; |
| 544 | *ne = '\0'; |
| 545 | |
| 546 | /* |
| 547 | * if no diff, continue to next line of redraw |
| 548 | */ |
| 549 | if (*ofd == '\0' && *nfd == '\0') { |
| 550 | ELRE_DEBUG(1, (__F, "no difference.\r\n")); |
| 551 | return; |
| 552 | } |
| 553 | /* |
| 554 | * find last same pointer |
| 555 | */ |
| 556 | while ((o > ofd) && (n > nfd) && (*--o == *--n)) |
| 557 | continue; |
| 558 | ols = ++o; |
| 559 | nls = ++n; |
| 560 | |
| 561 | /* |
| 562 | * find same begining and same end |
| 563 | */ |
| 564 | osb = ols; |
| 565 | nsb = nls; |
| 566 | ose = ols; |
| 567 | nse = nls; |
| 568 | |
| 569 | /* |
| 570 | * case 1: insert: scan from nfd to nls looking for *ofd |
| 571 | */ |
| 572 | if (*ofd) { |
| 573 | for (c = *ofd, n = nfd; n < nls; n++) { |
| 574 | if (c == *n) { |
| 575 | for (o = ofd, p = n; |
| 576 | p < nls && o < ols && *o == *p; |
| 577 | o++, p++) |
| 578 | continue; |
| 579 | /* |
| 580 | * if the new match is longer and it's worth |
| 581 | * keeping, then we take it |
| 582 | */ |
| 583 | if (((nse - nsb) < (p - n)) && |
| 584 | (2 * (p - n) > n - nfd)) { |
| 585 | nsb = n; |
| 586 | nse = p; |
| 587 | osb = ofd; |
| 588 | ose = o; |
| 589 | } |
| 590 | } |
| 591 | } |
| 592 | } |
| 593 | /* |
| 594 | * case 2: delete: scan from ofd to ols looking for *nfd |
| 595 | */ |
| 596 | if (*nfd) { |
| 597 | for (c = *nfd, o = ofd; o < ols; o++) { |
| 598 | if (c == *o) { |
| 599 | for (n = nfd, p = o; |
| 600 | p < ols && n < nls && *p == *n; |
| 601 | p++, n++) |
| 602 | continue; |
| 603 | /* |
| 604 | * if the new match is longer and it's worth |
| 605 | * keeping, then we take it |
| 606 | */ |
| 607 | if (((ose - osb) < (p - o)) && |
| 608 | (2 * (p - o) > o - ofd)) { |
| 609 | nsb = nfd; |
| 610 | nse = n; |
| 611 | osb = o; |
| 612 | ose = p; |
| 613 | } |
| 614 | } |
| 615 | } |
| 616 | } |
| 617 | /* |
| 618 | * Pragmatics I: If old trailing whitespace or not enough characters to |
| 619 | * save to be worth it, then don't save the last same info. |
| 620 | */ |
| 621 | if ((oe - ols) < MIN_END_KEEP) { |
| 622 | ols = oe; |
| 623 | nls = ne; |
| 624 | } |
| 625 | /* |
| 626 | * Pragmatics II: if the terminal isn't smart enough, make the data |
| 627 | * dumber so the smart update doesn't try anything fancy |
| 628 | */ |
| 629 | |
| 630 | /* |
| 631 | * fx is the number of characters we need to insert/delete: in the |
| 632 | * beginning to bring the two same begins together |
| 633 | */ |
| 634 | fx = (int)((nsb - nfd) - (osb - ofd)); |
| 635 | /* |
| 636 | * sx is the number of characters we need to insert/delete: in the |
| 637 | * end to bring the two same last parts together |
| 638 | */ |
| 639 | sx = (int)((nls - nse) - (ols - ose)); |
| 640 | |
| 641 | if (!EL_CAN_INSERT) { |
| 642 | if (fx > 0) { |
| 643 | osb = ols; |
| 644 | ose = ols; |
| 645 | nsb = nls; |
| 646 | nse = nls; |
| 647 | } |
| 648 | if (sx > 0) { |
| 649 | ols = oe; |
| 650 | nls = ne; |
| 651 | } |
| 652 | if ((ols - ofd) < (nls - nfd)) { |
| 653 | ols = oe; |
| 654 | nls = ne; |
| 655 | } |
| 656 | } |
| 657 | if (!EL_CAN_DELETE) { |
| 658 | if (fx < 0) { |
| 659 | osb = ols; |
| 660 | ose = ols; |
| 661 | nsb = nls; |
| 662 | nse = nls; |
| 663 | } |
| 664 | if (sx < 0) { |
| 665 | ols = oe; |
| 666 | nls = ne; |
| 667 | } |
| 668 | if ((ols - ofd) > (nls - nfd)) { |
| 669 | ols = oe; |
| 670 | nls = ne; |
| 671 | } |
| 672 | } |
| 673 | /* |
| 674 | * Pragmatics III: make sure the middle shifted pointers are correct if |
| 675 | * they don't point to anything (we may have moved ols or nls). |
| 676 | */ |
| 677 | /* if the change isn't worth it, don't bother */ |
| 678 | /* was: if (osb == ose) */ |
| 679 | if ((ose - osb) < MIN_END_KEEP) { |
| 680 | osb = ols; |
| 681 | ose = ols; |
| 682 | nsb = nls; |
| 683 | nse = nls; |
| 684 | } |
| 685 | /* |
| 686 | * Now that we are done with pragmatics we recompute fx, sx |
| 687 | */ |
| 688 | fx = (int)((nsb - nfd) - (osb - ofd)); |
| 689 | sx = (int)((nls - nse) - (ols - ose)); |
| 690 | |
| 691 | ELRE_DEBUG(1, (__F, "fx %d, sx %d\n", fx, sx)); |
| 692 | ELRE_DEBUG(1, (__F, "ofd %d, osb %d, ose %d, ols %d, oe %d\n", |
| 693 | ofd - old, osb - old, ose - old, ols - old, oe - old)); |
| 694 | ELRE_DEBUG(1, (__F, "nfd %d, nsb %d, nse %d, nls %d, ne %d\n", |
| 695 | nfd - new, nsb - new, nse - new, nls - new, ne - new)); |
| 696 | ELRE_DEBUG(1, (__F, |
| 697 | "xxx-xxx:\"00000000001111111111222222222233333333334\"\r\n")); |
| 698 | ELRE_DEBUG(1, (__F, |
| 699 | "xxx-xxx:\"01234567890123456789012345678901234567890\"\r\n")); |
| 700 | #ifdef DEBUG_REFRESH |
| 701 | re_printstr(el, "old- oe", old, oe); |
| 702 | re_printstr(el, "new- ne", new, ne); |
| 703 | re_printstr(el, "old-ofd", old, ofd); |
| 704 | re_printstr(el, "new-nfd", new, nfd); |
| 705 | re_printstr(el, "ofd-osb", ofd, osb); |
| 706 | re_printstr(el, "nfd-nsb", nfd, nsb); |
| 707 | re_printstr(el, "osb-ose", osb, ose); |
| 708 | re_printstr(el, "nsb-nse", nsb, nse); |
| 709 | re_printstr(el, "ose-ols", ose, ols); |
| 710 | re_printstr(el, "nse-nls", nse, nls); |
| 711 | re_printstr(el, "ols- oe", ols, oe); |
| 712 | re_printstr(el, "nls- ne", nls, ne); |
| 713 | #endif /* DEBUG_REFRESH */ |
| 714 | |
| 715 | /* |
| 716 | * el_cursor.v to this line i MUST be in this routine so that if we |
| 717 | * don't have to change the line, we don't move to it. el_cursor.h to |
| 718 | * first diff char |
| 719 | */ |
| 720 | terminal_move_to_line(el, i); |
| 721 | |
| 722 | /* |
| 723 | * at this point we have something like this: |
| 724 | * |
| 725 | * /old /ofd /osb /ose /ols /oe |
| 726 | * v.....................v v..................v v........v |
| 727 | * eddie> Oh, my fredded gruntle-buggy is to me, as foo var lurgid as |
| 728 | * eddie> Oh, my fredded quiux buggy is to me, as gruntle-lurgid as |
| 729 | * ^.....................^ ^..................^ ^........^ |
| 730 | * \new \nfd \nsb \nse \nls \ne |
| 731 | * |
| 732 | * fx is the difference in length between the chars between nfd and |
| 733 | * nsb, and the chars between ofd and osb, and is thus the number of |
| 734 | * characters to delete if < 0 (new is shorter than old, as above), |
| 735 | * or insert (new is longer than short). |
| 736 | * |
| 737 | * sx is the same for the second differences. |
| 738 | */ |
| 739 | |
| 740 | /* |
| 741 | * if we have a net insert on the first difference, AND inserting the |
| 742 | * net amount ((nsb-nfd) - (osb-ofd)) won't push the last useful |
| 743 | * character (which is ne if nls != ne, otherwise is nse) off the edge |
| 744 | * of the screen (el->el_terminal.t_size.h) else we do the deletes first |
| 745 | * so that we keep everything we need to. |
| 746 | */ |
| 747 | |
| 748 | /* |
| 749 | * if the last same is the same like the end, there is no last same |
| 750 | * part, otherwise we want to keep the last same part set p to the |
| 751 | * last useful old character |
| 752 | */ |
| 753 | p = (ols != oe) ? oe : ose; |
| 754 | |
| 755 | /* |
| 756 | * if (There is a diffence in the beginning) && (we need to insert |
| 757 | * characters) && (the number of characters to insert is less than |
| 758 | * the term width) |
| 759 | * We need to do an insert! |
| 760 | * else if (we need to delete characters) |
| 761 | * We need to delete characters! |
| 762 | * else |
| 763 | * No insert or delete |
| 764 | */ |
| 765 | if ((nsb != nfd) && fx > 0 && |
| 766 | ((p - old) + fx <= el->el_terminal.t_size.h)) { |
| 767 | ELRE_DEBUG(1, |
| 768 | (__F, "first diff insert at %d...\r\n", nfd - new)); |
| 769 | /* |
| 770 | * Move to the first char to insert, where the first diff is. |
| 771 | */ |
| 772 | terminal_move_to_char(el, (int)(nfd - new)); |
| 773 | /* |
| 774 | * Check if we have stuff to keep at end |
| 775 | */ |
| 776 | if (nsb != ne) { |
| 777 | ELRE_DEBUG(1, (__F, "with stuff to keep at end\r\n")); |
| 778 | /* |
| 779 | * insert fx chars of new starting at nfd |
| 780 | */ |
| 781 | if (fx > 0) { |
| 782 | ELRE_DEBUG(!EL_CAN_INSERT, (__F, |
| 783 | "ERROR: cannot insert in early first diff\n")); |
| 784 | terminal_insertwrite(el, nfd, fx); |
| 785 | re_insert(el, old, (int)(ofd - old), |
| 786 | el->el_terminal.t_size.h, nfd, fx); |
| 787 | } |
| 788 | /* |
| 789 | * write (nsb-nfd) - fx chars of new starting at |
| 790 | * (nfd + fx) |
| 791 | */ |
| 792 | len = (size_t) ((nsb - nfd) - fx); |
| 793 | terminal_overwrite(el, (nfd + fx), len); |
| 794 | re__strncopy(ofd + fx, nfd + fx, len); |
| 795 | } else { |
| 796 | ELRE_DEBUG(1, (__F, "without anything to save\r\n")); |
| 797 | len = (size_t)(nsb - nfd); |
| 798 | terminal_overwrite(el, nfd, len); |
| 799 | re__strncopy(ofd, nfd, len); |
| 800 | /* |
| 801 | * Done |
| 802 | */ |
| 803 | return; |
| 804 | } |
| 805 | } else if (fx < 0) { |
| 806 | ELRE_DEBUG(1, |
| 807 | (__F, "first diff delete at %d...\r\n", ofd - old)); |
| 808 | /* |
| 809 | * move to the first char to delete where the first diff is |
| 810 | */ |
| 811 | terminal_move_to_char(el, (int)(ofd - old)); |
| 812 | /* |
| 813 | * Check if we have stuff to save |
| 814 | */ |
| 815 | if (osb != oe) { |
| 816 | ELRE_DEBUG(1, (__F, "with stuff to save at end\r\n")); |
| 817 | /* |
| 818 | * fx is less than zero *always* here but we check |
| 819 | * for code symmetry |
| 820 | */ |
| 821 | if (fx < 0) { |
| 822 | ELRE_DEBUG(!EL_CAN_DELETE, (__F, |
| 823 | "ERROR: cannot delete in first diff\n")); |
| 824 | terminal_deletechars(el, -fx); |
| 825 | re_delete(el, old, (int)(ofd - old), |
| 826 | el->el_terminal.t_size.h, -fx); |
| 827 | } |
| 828 | /* |
| 829 | * write (nsb-nfd) chars of new starting at nfd |
| 830 | */ |
| 831 | len = (size_t) (nsb - nfd); |
| 832 | terminal_overwrite(el, nfd, len); |
| 833 | re__strncopy(ofd, nfd, len); |
| 834 | |
| 835 | } else { |
| 836 | ELRE_DEBUG(1, (__F, |
| 837 | "but with nothing left to save\r\n")); |
| 838 | /* |
| 839 | * write (nsb-nfd) chars of new starting at nfd |
| 840 | */ |
| 841 | terminal_overwrite(el, nfd, (size_t)(nsb - nfd)); |
| 842 | re_clear_eol(el, fx, sx, |
| 843 | (int)((oe - old) - (ne - new))); |
| 844 | /* |
| 845 | * Done |
| 846 | */ |
| 847 | return; |
| 848 | } |
| 849 | } else |
| 850 | fx = 0; |
| 851 | |
| 852 | if (sx < 0 && (ose - old) + fx < el->el_terminal.t_size.h) { |
| 853 | ELRE_DEBUG(1, (__F, |
| 854 | "second diff delete at %d...\r\n", (ose - old) + fx)); |
| 855 | /* |
| 856 | * Check if we have stuff to delete |
| 857 | */ |
| 858 | /* |
| 859 | * fx is the number of characters inserted (+) or deleted (-) |
| 860 | */ |
| 861 | |
| 862 | terminal_move_to_char(el, (int)((ose - old) + fx)); |
| 863 | /* |
| 864 | * Check if we have stuff to save |
| 865 | */ |
| 866 | if (ols != oe) { |
| 867 | ELRE_DEBUG(1, (__F, "with stuff to save at end\r\n")); |
| 868 | /* |
| 869 | * Again a duplicate test. |
| 870 | */ |
| 871 | if (sx < 0) { |
| 872 | ELRE_DEBUG(!EL_CAN_DELETE, (__F, |
| 873 | "ERROR: cannot delete in second diff\n")); |
| 874 | terminal_deletechars(el, -sx); |
| 875 | } |
| 876 | /* |
| 877 | * write (nls-nse) chars of new starting at nse |
| 878 | */ |
| 879 | terminal_overwrite(el, nse, (size_t)(nls - nse)); |
| 880 | } else { |
| 881 | ELRE_DEBUG(1, (__F, |
| 882 | "but with nothing left to save\r\n")); |
| 883 | terminal_overwrite(el, nse, (size_t)(nls - nse)); |
| 884 | re_clear_eol(el, fx, sx, |
| 885 | (int)((oe - old) - (ne - new))); |
| 886 | } |
| 887 | } |
| 888 | /* |
| 889 | * if we have a first insert AND WE HAVEN'T ALREADY DONE IT... |
| 890 | */ |
| 891 | if ((nsb != nfd) && (osb - ofd) <= (nsb - nfd) && (fx == 0)) { |
| 892 | ELRE_DEBUG(1, (__F, "late first diff insert at %d...\r\n", |
| 893 | nfd - new)); |
| 894 | |
| 895 | terminal_move_to_char(el, (int)(nfd - new)); |
| 896 | /* |
| 897 | * Check if we have stuff to keep at the end |
| 898 | */ |
| 899 | if (nsb != ne) { |
| 900 | ELRE_DEBUG(1, (__F, "with stuff to keep at end\r\n")); |
| 901 | /* |
| 902 | * We have to recalculate fx here because we set it |
| 903 | * to zero above as a flag saying that we hadn't done |
| 904 | * an early first insert. |
| 905 | */ |
| 906 | fx = (int)((nsb - nfd) - (osb - ofd)); |
| 907 | if (fx > 0) { |
| 908 | /* |
| 909 | * insert fx chars of new starting at nfd |
| 910 | */ |
| 911 | ELRE_DEBUG(!EL_CAN_INSERT, (__F, |
| 912 | "ERROR: cannot insert in late first diff\n")); |
| 913 | terminal_insertwrite(el, nfd, fx); |
| 914 | re_insert(el, old, (int)(ofd - old), |
| 915 | el->el_terminal.t_size.h, nfd, fx); |
| 916 | } |
| 917 | /* |
| 918 | * write (nsb-nfd) - fx chars of new starting at |
| 919 | * (nfd + fx) |
| 920 | */ |
| 921 | len = (size_t) ((nsb - nfd) - fx); |
| 922 | terminal_overwrite(el, (nfd + fx), len); |
| 923 | re__strncopy(ofd + fx, nfd + fx, len); |
| 924 | } else { |
| 925 | ELRE_DEBUG(1, (__F, "without anything to save\r\n")); |
| 926 | len = (size_t) (nsb - nfd); |
| 927 | terminal_overwrite(el, nfd, len); |
| 928 | re__strncopy(ofd, nfd, len); |
| 929 | } |
| 930 | } |
| 931 | /* |
| 932 | * line is now NEW up to nse |
| 933 | */ |
| 934 | if (sx >= 0) { |
| 935 | ELRE_DEBUG(1, (__F, |
| 936 | "second diff insert at %d...\r\n", (int)(nse - new))); |
| 937 | terminal_move_to_char(el, (int)(nse - new)); |
| 938 | if (ols != oe) { |
| 939 | ELRE_DEBUG(1, (__F, "with stuff to keep at end\r\n")); |
| 940 | if (sx > 0) { |
| 941 | /* insert sx chars of new starting at nse */ |
| 942 | ELRE_DEBUG(!EL_CAN_INSERT, (__F, |
| 943 | "ERROR: cannot insert in second diff\n")); |
| 944 | terminal_insertwrite(el, nse, sx); |
| 945 | } |
| 946 | /* |
| 947 | * write (nls-nse) - sx chars of new starting at |
| 948 | * (nse + sx) |
| 949 | */ |
| 950 | terminal_overwrite(el, (nse + sx), |
| 951 | (size_t)((nls - nse) - sx)); |
| 952 | } else { |
| 953 | ELRE_DEBUG(1, (__F, "without anything to save\r\n")); |
| 954 | terminal_overwrite(el, nse, (size_t)(nls - nse)); |
| 955 | |
| 956 | /* |
| 957 | * No need to do a clear-to-end here because we were |
| 958 | * doing a second insert, so we will have over |
| 959 | * written all of the old string. |
| 960 | */ |
| 961 | } |
| 962 | } |
| 963 | ELRE_DEBUG(1, (__F, "done.\r\n")); |
| 964 | } |
| 965 | |
| 966 | |
| 967 | /* re__copy_and_pad(): |
| 968 | * Copy string and pad with spaces |
| 969 | */ |
| 970 | private void |
| 971 | re__copy_and_pad(Char *dst, const Char *src, size_t width) |
| 972 | { |
| 973 | size_t i; |
| 974 | |
| 975 | for (i = 0; i < width; i++) { |
| 976 | if (*src == '\0') |
| 977 | break; |
| 978 | *dst++ = *src++; |
| 979 | } |
| 980 | |
| 981 | for (; i < width; i++) |
| 982 | *dst++ = ' '; |
| 983 | |
| 984 | *dst = '\0'; |
| 985 | } |
| 986 | |
| 987 | |
| 988 | /* re_refresh_cursor(): |
| 989 | * Move to the new cursor position |
| 990 | */ |
| 991 | protected void |
| 992 | re_refresh_cursor(EditLine *el) |
| 993 | { |
| 994 | Char *cp; |
| 995 | int h, v, th, w; |
| 996 | |
| 997 | if (el->el_line.cursor >= el->el_line.lastchar) { |
| 998 | if (el->el_map.current == el->el_map.alt |
| 999 | && el->el_line.lastchar != el->el_line.buffer) |
| 1000 | el->el_line.cursor = el->el_line.lastchar - 1; |
| 1001 | else |
| 1002 | el->el_line.cursor = el->el_line.lastchar; |
| 1003 | } |
| 1004 | |
| 1005 | /* first we must find where the cursor is... */ |
| 1006 | h = el->el_prompt.p_pos.h; |
| 1007 | v = el->el_prompt.p_pos.v; |
| 1008 | th = el->el_terminal.t_size.h; /* optimize for speed */ |
| 1009 | |
| 1010 | /* do input buffer to el->el_line.cursor */ |
| 1011 | for (cp = el->el_line.buffer; cp < el->el_line.cursor; cp++) { |
| 1012 | switch (ct_chr_class(*cp)) { |
| 1013 | case CHTYPE_NL: /* handle newline in data part too */ |
| 1014 | h = 0; |
| 1015 | v++; |
| 1016 | break; |
| 1017 | case CHTYPE_TAB: /* if a tab, to next tab stop */ |
| 1018 | while (++h & 07) |
| 1019 | continue; |
| 1020 | break; |
| 1021 | default: |
| 1022 | w = Width(*cp); |
| 1023 | if (w > 1 && h + w > th) { /* won't fit on line */ |
| 1024 | h = 0; |
| 1025 | v++; |
| 1026 | } |
| 1027 | h += ct_visual_width(*cp); |
| 1028 | break; |
| 1029 | } |
| 1030 | |
| 1031 | if (h >= th) { /* check, extra long tabs picked up here also */ |
| 1032 | h -= th; |
| 1033 | v++; |
| 1034 | } |
| 1035 | } |
| 1036 | /* if we have a next character, and it's a doublewidth one, we need to |
| 1037 | * check whether we need to linebreak for it to fit */ |
| 1038 | if (cp < el->el_line.lastchar && (w = Width(*cp)) > 1) |
| 1039 | if (h + w > th) { |
| 1040 | h = 0; |
| 1041 | v++; |
| 1042 | } |
| 1043 | |
| 1044 | /* now go there */ |
| 1045 | terminal_move_to_line(el, v); |
| 1046 | terminal_move_to_char(el, h); |
| 1047 | terminal__flush(el); |
| 1048 | } |
| 1049 | |
| 1050 | |
| 1051 | /* re_fastputc(): |
| 1052 | * Add a character fast. |
| 1053 | */ |
| 1054 | private void |
| 1055 | re_fastputc(EditLine *el, Int c) |
| 1056 | { |
| 1057 | int w = Width((Char)c); |
| 1058 | while (w > 1 && el->el_cursor.h + w > el->el_terminal.t_size.h) |
| 1059 | re_fastputc(el, ' '); |
| 1060 | |
| 1061 | terminal__putc(el, c); |
| 1062 | el->el_display[el->el_cursor.v][el->el_cursor.h++] = c; |
| 1063 | while (--w > 0) |
| 1064 | el->el_display[el->el_cursor.v][el->el_cursor.h++] |
| 1065 | = MB_FILL_CHAR; |
| 1066 | |
| 1067 | if (el->el_cursor.h >= el->el_terminal.t_size.h) { |
| 1068 | /* if we must overflow */ |
| 1069 | el->el_cursor.h = 0; |
| 1070 | |
| 1071 | /* |
| 1072 | * If we would overflow (input is longer than terminal size), |
| 1073 | * emulate scroll by dropping first line and shuffling the rest. |
| 1074 | * We do this via pointer shuffling - it's safe in this case |
| 1075 | * and we avoid memcpy(). |
| 1076 | */ |
| 1077 | if (el->el_cursor.v + 1 >= el->el_terminal.t_size.v) { |
| 1078 | int i, lins = el->el_terminal.t_size.v; |
| 1079 | Char *firstline = el->el_display[0]; |
| 1080 | |
| 1081 | for(i = 1; i < lins; i++) |
| 1082 | el->el_display[i - 1] = el->el_display[i]; |
| 1083 | |
| 1084 | re__copy_and_pad(firstline, STR(""), (size_t)0); |
| 1085 | el->el_display[i - 1] = firstline; |
| 1086 | } else { |
| 1087 | el->el_cursor.v++; |
| 1088 | el->el_refresh.r_oldcv++; |
| 1089 | } |
| 1090 | if (EL_HAS_AUTO_MARGINS) { |
| 1091 | if (EL_HAS_MAGIC_MARGINS) { |
| 1092 | terminal__putc(el, ' '); |
| 1093 | terminal__putc(el, '\b'); |
| 1094 | } |
| 1095 | } else { |
| 1096 | terminal__putc(el, '\r'); |
| 1097 | terminal__putc(el, '\n'); |
| 1098 | } |
| 1099 | } |
| 1100 | } |
| 1101 | |
| 1102 | |
| 1103 | /* re_fastaddc(): |
| 1104 | * we added just one char, handle it fast. |
| 1105 | * Assumes that screen cursor == real cursor |
| 1106 | */ |
| 1107 | protected void |
| 1108 | re_fastaddc(EditLine *el) |
| 1109 | { |
| 1110 | Char c; |
| 1111 | int rhdiff; |
| 1112 | |
| 1113 | c = el->el_line.cursor[-1]; |
| 1114 | |
| 1115 | if (c == '\t' || el->el_line.cursor != el->el_line.lastchar) { |
| 1116 | re_refresh(el); /* too hard to handle */ |
| 1117 | return; |
| 1118 | } |
| 1119 | rhdiff = el->el_terminal.t_size.h - el->el_cursor.h - |
| 1120 | el->el_rprompt.p_pos.h; |
| 1121 | if (el->el_rprompt.p_pos.h && rhdiff < 3) { |
| 1122 | re_refresh(el); /* clear out rprompt if less than 1 char gap */ |
| 1123 | return; |
| 1124 | } /* else (only do at end of line, no TAB) */ |
| 1125 | switch (ct_chr_class(c)) { |
| 1126 | case CHTYPE_TAB: /* already handled, should never happen here */ |
| 1127 | break; |
| 1128 | case CHTYPE_NL: |
| 1129 | case CHTYPE_PRINT: |
| 1130 | re_fastputc(el, c); |
| 1131 | break; |
| 1132 | case CHTYPE_ASCIICTL: |
| 1133 | case CHTYPE_NONPRINT: { |
| 1134 | Char visbuf[VISUAL_WIDTH_MAX]; |
| 1135 | ssize_t i, n = |
| 1136 | ct_visual_char(visbuf, VISUAL_WIDTH_MAX, (Char)c); |
| 1137 | for (i = 0; n-- > 0; ++i) |
| 1138 | re_fastputc(el, visbuf[i]); |
| 1139 | break; |
| 1140 | } |
| 1141 | } |
| 1142 | terminal__flush(el); |
| 1143 | } |
| 1144 | |
| 1145 | |
| 1146 | /* re_clear_display(): |
| 1147 | * clear the screen buffers so that new new prompt starts fresh. |
| 1148 | */ |
| 1149 | protected void |
| 1150 | re_clear_display(EditLine *el) |
| 1151 | { |
| 1152 | int i; |
| 1153 | |
| 1154 | el->el_cursor.v = 0; |
| 1155 | el->el_cursor.h = 0; |
| 1156 | for (i = 0; i < el->el_terminal.t_size.v; i++) |
| 1157 | el->el_display[i][0] = '\0'; |
| 1158 | el->el_refresh.r_oldcv = 0; |
| 1159 | } |
| 1160 | |
| 1161 | |
| 1162 | /* re_clear_lines(): |
| 1163 | * Make sure all lines are *really* blank |
| 1164 | */ |
| 1165 | protected void |
| 1166 | re_clear_lines(EditLine *el) |
| 1167 | { |
| 1168 | |
| 1169 | if (EL_CAN_CEOL) { |
| 1170 | int i; |
| 1171 | for (i = el->el_refresh.r_oldcv; i >= 0; i--) { |
| 1172 | /* for each line on the screen */ |
| 1173 | terminal_move_to_line(el, i); |
| 1174 | terminal_move_to_char(el, 0); |
| 1175 | terminal_clear_EOL(el, el->el_terminal.t_size.h); |
| 1176 | } |
| 1177 | } else { |
| 1178 | terminal_move_to_line(el, el->el_refresh.r_oldcv); |
| 1179 | /* go to last line */ |
| 1180 | terminal__putc(el, '\r'); /* go to BOL */ |
| 1181 | terminal__putc(el, '\n'); /* go to new line */ |
| 1182 | } |
| 1183 | } |