lib/libedit/search.c

   1 /*      $NetBSD: search.c,v 1.30 2011/10/04 15:27:04 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[] = "@(#)search.c    8.1 (Berkeley) 6/4/93";
  39 #else
  40 __RCSID("$NetBSD: search.c,v 1.30 2011/10/04 15:27:04 christos Exp $");
  41 #endif
  42 #endif /* not lint && not SCCSID */
  43
  44 /*
  45  * search.c: History and character search functions
  46  */
  47 #include <stdlib.h>
  48 #if defined(REGEX)
  49 #include <regex.h>
  50 #elif defined(REGEXP)
  51 #include <regexp.h>
  52 #endif
  53 #include "el.h"
  54
  55 /*
  56  * Adjust cursor in vi mode to include the character under it
  57  */
  58 #define EL_CURSOR(el) \
  59     ((el)->el_line.cursor + (((el)->el_map.type == MAP_VI) && \
  60                             ((el)->el_map.current == (el)->el_map.alt)))
  61
  62 /* search_init():
  63  *      Initialize the search stuff
  64  */
  65 protected int
  66 search_init(EditLine *el)
  67 {
  68
  69         el->el_search.patbuf = el_malloc(EL_BUFSIZ *
  70             sizeof(*el->el_search.patbuf));
  71         if (el->el_search.patbuf == NULL)
  72                 return -1;
  73         el->el_search.patlen = 0;
  74         el->el_search.patdir = -1;
  75         el->el_search.chacha = '\0';
  76         el->el_search.chadir = CHAR_FWD;
  77         el->el_search.chatflg = 0;
  78         return 0;
  79 }
  80
  81
  82 /* search_end():
  83  *      Initialize the search stuff
  84  */
  85 protected void
  86 search_end(EditLine *el)
  87 {
  88
  89         el_free(el->el_search.patbuf);
  90         el->el_search.patbuf = NULL;
  91 }
  92
  93
  94 #ifdef REGEXP
  95 /* regerror():
  96  *      Handle regular expression errors
  97  */
  98 public void
  99 /*ARGSUSED*/
 100 regerror(const char *msg)
 101 {
 102 }
 103 #endif
 104
 105
 106 /* el_match():
 107  *      Return if string matches pattern
 108  */
 109 protected int
 110 el_match(const Char *str, const Char *pat)
 111 {
 112 #ifdef WIDECHAR
 113         static ct_buffer_t conv;
 114 #endif
 115 #if defined (REGEX)
 116         regex_t re;
 117         int rv;
 118 #elif defined (REGEXP)
 119         regexp *rp;
 120         int rv;
 121 #else
 122         extern char     *re_comp(const char *);
 123         extern int       re_exec(const char *);
 124 #endif
 125
 126         if (Strstr(str, pat) != 0)
 127                 return 1;
 128
 129 #if defined(REGEX)
 130         if (regcomp(&re, ct_encode_string(pat, &conv), 0) == 0) {
 131                 rv = regexec(&re, ct_encode_string(str, &conv), (size_t)0, NULL,
 132                     0) == 0;
 133                 regfree(&re);
 134         } else {
 135                 rv = 0;
 136         }
 137         return rv;
 138 #elif defined(REGEXP)
 139         if ((re = regcomp(ct_encode_string(pat, &conv))) != NULL) {
 140                 rv = regexec(re, ct_encode_string(str, &conv));
 141                 el_free(re);
 142         } else {
 143                 rv = 0;
 144         }
 145         return rv;
 146 #else
 147         if (re_comp(ct_encode_string(pat, &conv)) != NULL)
 148                 return 0;
 149         else
 150                 return re_exec(ct_encode_string(str, &conv) == 1);
 151 #endif
 152 }
 153
 154
 155 /* c_hmatch():
 156  *       return True if the pattern matches the prefix
 157  */
 158 protected int
 159 c_hmatch(EditLine *el, const Char *str)
 160 {
 161 #ifdef SDEBUG
 162         (void) fprintf(el->el_errfile, "match `%s' with `%s'\n",
 163             el->el_search.patbuf, str);
 164 #endif /* SDEBUG */
 165
 166         return el_match(str, el->el_search.patbuf);
 167 }
 168
 169
 170 /* c_setpat():
 171  *      Set the history seatch pattern
 172  */
 173 protected void
 174 c_setpat(EditLine *el)
 175 {
 176         if (el->el_state.lastcmd != ED_SEARCH_PREV_HISTORY &&
 177             el->el_state.lastcmd != ED_SEARCH_NEXT_HISTORY) {
 178                 el->el_search.patlen =
 179                     (size_t)(EL_CURSOR(el) - el->el_line.buffer);
 180                 if (el->el_search.patlen >= EL_BUFSIZ)
 181                         el->el_search.patlen = EL_BUFSIZ - 1;
 182                 if (el->el_search.patlen != 0) {
 183                         (void) Strncpy(el->el_search.patbuf, el->el_line.buffer,
 184                             el->el_search.patlen);
 185                         el->el_search.patbuf[el->el_search.patlen] = '\0';
 186                 } else
 187                         el->el_search.patlen = Strlen(el->el_search.patbuf);
 188         }
 189 #ifdef SDEBUG
 190         (void) fprintf(el->el_errfile, "\neventno = %d\n",
 191             el->el_history.eventno);
 192         (void) fprintf(el->el_errfile, "patlen = %d\n", el->el_search.patlen);
 193         (void) fprintf(el->el_errfile, "patbuf = \"%s\"\n",
 194             el->el_search.patbuf);
 195         (void) fprintf(el->el_errfile, "cursor %d lastchar %d\n",
 196             EL_CURSOR(el) - el->el_line.buffer,
 197             el->el_line.lastchar - el->el_line.buffer);
 198 #endif
 199 }
 200
 201
 202 /* ce_inc_search():
 203  *      Emacs incremental search
 204  */
 205 protected el_action_t
 206 ce_inc_search(EditLine *el, int dir)
 207 {
 208         static const Char STRfwd[] = {'f', 'w', 'd', '\0'},
 209              STRbck[] = {'b', 'c', 'k', '\0'};
 210         static Char pchar = ':';/* ':' = normal, '?' = failed */
 211         static Char endcmd[2] = {'\0', '\0'};
 212         Char ch, *ocursor = el->el_line.cursor, oldpchar = pchar;
 213         const Char *cp;
 214
 215         el_action_t ret = CC_NORM;
 216
 217         int ohisteventno = el->el_history.eventno;
 218         size_t oldpatlen = el->el_search.patlen;
 219         int newdir = dir;
 220         int done, redo;
 221
 222         if (el->el_line.lastchar + sizeof(STRfwd) /
 223             sizeof(*el->el_line.lastchar) + 2 +
 224             el->el_search.patlen >= el->el_line.limit)
 225                 return CC_ERROR;
 226
 227         for (;;) {
 228
 229                 if (el->el_search.patlen == 0) {        /* first round */
 230                         pchar = ':';
 231 #ifdef ANCHOR
 232 #define LEN     2
 233                         el->el_search.patbuf[el->el_search.patlen++] = '.';
 234                         el->el_search.patbuf[el->el_search.patlen++] = '*';
 235 #else
 236 #define LEN     0
 237 #endif
 238                 }
 239                 done = redo = 0;
 240                 *el->el_line.lastchar++ = '\n';
 241                 for (cp = (newdir == ED_SEARCH_PREV_HISTORY) ? STRbck : STRfwd;
 242                     *cp; *el->el_line.lastchar++ = *cp++)
 243                         continue;
 244                 *el->el_line.lastchar++ = pchar;
 245                 for (cp = &el->el_search.patbuf[LEN];
 246                     cp < &el->el_search.patbuf[el->el_search.patlen];
 247                     *el->el_line.lastchar++ = *cp++)
 248                         continue;
 249                 *el->el_line.lastchar = '\0';
 250                 re_refresh(el);
 251
 252                 if (FUN(el,getc)(el, &ch) != 1)
 253                         return ed_end_of_file(el, 0);
 254
 255                 switch (el->el_map.current[(unsigned char) ch]) {
 256                 case ED_INSERT:
 257                 case ED_DIGIT:
 258                         if (el->el_search.patlen >= EL_BUFSIZ - LEN)
 259                                 terminal_beep(el);
 260                         else {
 261                                 el->el_search.patbuf[el->el_search.patlen++] =
 262                                     ch;
 263                                 *el->el_line.lastchar++ = ch;
 264                                 *el->el_line.lastchar = '\0';
 265                                 re_refresh(el);
 266                         }
 267                         break;
 268
 269                 case EM_INC_SEARCH_NEXT:
 270                         newdir = ED_SEARCH_NEXT_HISTORY;
 271                         redo++;
 272                         break;
 273
 274                 case EM_INC_SEARCH_PREV:
 275                         newdir = ED_SEARCH_PREV_HISTORY;
 276                         redo++;
 277                         break;
 278
 279                 case EM_DELETE_PREV_CHAR:
 280                 case ED_DELETE_PREV_CHAR:
 281                         if (el->el_search.patlen > LEN)
 282                                 done++;
 283                         else
 284                                 terminal_beep(el);
 285                         break;
 286
 287                 default:
 288                         switch (ch) {
 289                         case 0007:      /* ^G: Abort */
 290                                 ret = CC_ERROR;
 291                                 done++;
 292                                 break;
 293
 294                         case 0027:      /* ^W: Append word */
 295                         /* No can do if globbing characters in pattern */
 296                                 for (cp = &el->el_search.patbuf[LEN];; cp++)
 297                                     if (cp >= &el->el_search.patbuf[
 298                                         el->el_search.patlen]) {
 299                                         el->el_line.cursor +=
 300                                             el->el_search.patlen - LEN - 1;
 301                                         cp = c__next_word(el->el_line.cursor,
 302                                             el->el_line.lastchar, 1,
 303                                             ce__isword);
 304                                         while (el->el_line.cursor < cp &&
 305                                             *el->el_line.cursor != '\n') {
 306                                                 if (el->el_search.patlen >=
 307                                                     EL_BUFSIZ - LEN) {
 308                                                         terminal_beep(el);
 309                                                         break;
 310                                                 }
 311                                                 el->el_search.patbuf[el->el_search.patlen++] =
 312                                                     *el->el_line.cursor;
 313                                                 *el->el_line.lastchar++ =
 314                                                     *el->el_line.cursor++;
 315                                         }
 316                                         el->el_line.cursor = ocursor;
 317                                         *el->el_line.lastchar = '\0';
 318                                         re_refresh(el);
 319                                         break;
 320                                     } else if (isglob(*cp)) {
 321                                             terminal_beep(el);
 322                                             break;
 323                                     }
 324                                 break;
 325
 326                         default:        /* Terminate and execute cmd */
 327                                 endcmd[0] = ch;
 328                                 FUN(el,push)(el, endcmd);
 329                                 /* FALLTHROUGH */
 330
 331                         case 0033:      /* ESC: Terminate */
 332                                 ret = CC_REFRESH;
 333                                 done++;
 334                                 break;
 335                         }
 336                         break;
 337                 }
 338
 339                 while (el->el_line.lastchar > el->el_line.buffer &&
 340                     *el->el_line.lastchar != '\n')
 341                         *el->el_line.lastchar-- = '\0';
 342                 *el->el_line.lastchar = '\0';
 343
 344                 if (!done) {
 345
 346                         /* Can't search if unmatched '[' */
 347                         for (cp = &el->el_search.patbuf[el->el_search.patlen-1],
 348                             ch = ']';
 349                             cp >= &el->el_search.patbuf[LEN];
 350                             cp--)
 351                                 if (*cp == '[' || *cp == ']') {
 352                                         ch = *cp;
 353                                         break;
 354                                 }
 355                         if (el->el_search.patlen > LEN && ch != '[') {
 356                                 if (redo && newdir == dir) {
 357                                         if (pchar == '?') { /* wrap around */
 358                                                 el->el_history.eventno =
 359                                                     newdir == ED_SEARCH_PREV_HISTORY ? 0 : 0x7fffffff;
 360                                                 if (hist_get(el) == CC_ERROR)
 361                                                         /* el->el_history.event
 362                                                          * no was fixed by
 363                                                          * first call */
 364                                                         (void) hist_get(el);
 365                                                 el->el_line.cursor = newdir ==
 366                                                     ED_SEARCH_PREV_HISTORY ?
 367                                                     el->el_line.lastchar :
 368                                                     el->el_line.buffer;
 369                                         } else
 370                                                 el->el_line.cursor +=
 371                                                     newdir ==
 372                                                     ED_SEARCH_PREV_HISTORY ?
 373                                                     -1 : 1;
 374                                 }
 375 #ifdef ANCHOR
 376                                 el->el_search.patbuf[el->el_search.patlen++] =
 377                                     '.';
 378                                 el->el_search.patbuf[el->el_search.patlen++] =
 379                                     '*';
 380 #endif
 381                                 el->el_search.patbuf[el->el_search.patlen] =
 382                                     '\0';
 383                                 if (el->el_line.cursor < el->el_line.buffer ||
 384                                     el->el_line.cursor > el->el_line.lastchar ||
 385                                     (ret = ce_search_line(el, newdir))
 386                                     == CC_ERROR) {
 387                                         /* avoid c_setpat */
 388                                         el->el_state.lastcmd =
 389                                             (el_action_t) newdir;
 390                                         ret = (el_action_t)
 391                                             (newdir == ED_SEARCH_PREV_HISTORY ?
 392                                             ed_search_prev_history(el, 0) :
 393                                             ed_search_next_history(el, 0));
 394                                         if (ret != CC_ERROR) {
 395                                                 el->el_line.cursor = newdir ==
 396                                                     ED_SEARCH_PREV_HISTORY ?
 397                                                     el->el_line.lastchar :
 398                                                     el->el_line.buffer;
 399                                                 (void) ce_search_line(el,
 400                                                     newdir);
 401                                         }
 402                                 }
 403                                 el->el_search.patlen -= LEN;
 404                                 el->el_search.patbuf[el->el_search.patlen] =
 405                                     '\0';
 406                                 if (ret == CC_ERROR) {
 407                                         terminal_beep(el);
 408                                         if (el->el_history.eventno !=
 409                                             ohisteventno) {
 410                                                 el->el_history.eventno =
 411                                                     ohisteventno;
 412                                                 if (hist_get(el) == CC_ERROR)
 413                                                         return CC_ERROR;
 414                                         }
 415                                         el->el_line.cursor = ocursor;
 416                                         pchar = '?';
 417                                 } else {
 418                                         pchar = ':';
 419                                 }
 420                         }
 421                         ret = ce_inc_search(el, newdir);
 422
 423                         if (ret == CC_ERROR && pchar == '?' && oldpchar == ':')
 424                                 /*
 425                                  * break abort of failed search at last
 426                                  * non-failed
 427                                  */
 428                                 ret = CC_NORM;
 429
 430                 }
 431                 if (ret == CC_NORM || (ret == CC_ERROR && oldpatlen == 0)) {
 432                         /* restore on normal return or error exit */
 433                         pchar = oldpchar;
 434                         el->el_search.patlen = oldpatlen;
 435                         if (el->el_history.eventno != ohisteventno) {
 436                                 el->el_history.eventno = ohisteventno;
 437                                 if (hist_get(el) == CC_ERROR)
 438                                         return CC_ERROR;
 439                         }
 440                         el->el_line.cursor = ocursor;
 441                         if (ret == CC_ERROR)
 442                                 re_refresh(el);
 443                 }
 444                 if (done || ret != CC_NORM)
 445                         return ret;
 446         }
 447 }
 448
 449
 450 /* cv_search():
 451  *      Vi search.
 452  */
 453 protected el_action_t
 454 cv_search(EditLine *el, int dir)
 455 {
 456         Char ch;
 457         Char tmpbuf[EL_BUFSIZ];
 458         ssize_t tmplen;
 459
 460 #ifdef ANCHOR
 461         tmpbuf[0] = '.';
 462         tmpbuf[1] = '*';
 463 #endif
 464         tmplen = LEN;
 465
 466         el->el_search.patdir = dir;
 467
 468         tmplen = c_gets(el, &tmpbuf[LEN],
 469                 dir == ED_SEARCH_PREV_HISTORY ? STR("\n/") : STR("\n?") );
 470         if (tmplen == -1)
 471                 return CC_REFRESH;
 472
 473         tmplen += LEN;
 474         ch = tmpbuf[tmplen];
 475         tmpbuf[tmplen] = '\0';
 476
 477         if (tmplen == LEN) {
 478                 /*
 479                  * Use the old pattern, but wild-card it.
 480                  */
 481                 if (el->el_search.patlen == 0) {
 482                         re_refresh(el);
 483                         return CC_ERROR;
 484                 }
 485 #ifdef ANCHOR
 486                 if (el->el_search.patbuf[0] != '.' &&
 487                     el->el_search.patbuf[0] != '*') {
 488                         (void) Strncpy(tmpbuf, el->el_search.patbuf,
 489                             sizeof(tmpbuf) / sizeof(*tmpbuf) - 1);
 490                         el->el_search.patbuf[0] = '.';
 491                         el->el_search.patbuf[1] = '*';
 492                         (void) Strncpy(&el->el_search.patbuf[2], tmpbuf,
 493                             EL_BUFSIZ - 3);
 494                         el->el_search.patlen++;
 495                         el->el_search.patbuf[el->el_search.patlen++] = '.';
 496                         el->el_search.patbuf[el->el_search.patlen++] = '*';
 497                         el->el_search.patbuf[el->el_search.patlen] = '\0';
 498                 }
 499 #endif
 500         } else {
 501 #ifdef ANCHOR
 502                 tmpbuf[tmplen++] = '.';
 503                 tmpbuf[tmplen++] = '*';
 504 #endif
 505                 tmpbuf[tmplen] = '\0';
 506                 (void) Strncpy(el->el_search.patbuf, tmpbuf, EL_BUFSIZ - 1);
 507                 el->el_search.patlen = (size_t)tmplen;
 508         }
 509         el->el_state.lastcmd = (el_action_t) dir;       /* avoid c_setpat */
 510         el->el_line.cursor = el->el_line.lastchar = el->el_line.buffer;
 511         if ((dir == ED_SEARCH_PREV_HISTORY ? ed_search_prev_history(el, 0) :
 512             ed_search_next_history(el, 0)) == CC_ERROR) {
 513                 re_refresh(el);
 514                 return CC_ERROR;
 515         }
 516         if (ch == 0033) {
 517                 re_refresh(el);
 518                 return ed_newline(el, 0);
 519         }
 520         return CC_REFRESH;
 521 }
 522
 523
 524 /* ce_search_line():
 525  *      Look for a pattern inside a line
 526  */
 527 protected el_action_t
 528 ce_search_line(EditLine *el, int dir)
 529 {
 530         Char *cp = el->el_line.cursor;
 531         Char *pattern = el->el_search.patbuf;
 532         Char oc, *ocp;
 533 #ifdef ANCHOR
 534         ocp = &pattern[1];
 535         oc = *ocp;
 536         *ocp = '^';
 537 #else
 538         ocp = pattern;
 539         oc = *ocp;
 540 #endif
 541
 542         if (dir == ED_SEARCH_PREV_HISTORY) {
 543                 for (; cp >= el->el_line.buffer; cp--) {
 544                         if (el_match(cp, ocp)) {
 545                                 *ocp = oc;
 546                                 el->el_line.cursor = cp;
 547                                 return CC_NORM;
 548                         }
 549                 }
 550                 *ocp = oc;
 551                 return CC_ERROR;
 552         } else {
 553                 for (; *cp != '\0' && cp < el->el_line.limit; cp++) {
 554                         if (el_match(cp, ocp)) {
 555                                 *ocp = oc;
 556                                 el->el_line.cursor = cp;
 557                                 return CC_NORM;
 558                         }
 559                 }
 560                 *ocp = oc;
 561                 return CC_ERROR;
 562         }
 563 }
 564
 565
 566 /* cv_repeat_srch():
 567  *      Vi repeat search
 568  */
 569 protected el_action_t
 570 cv_repeat_srch(EditLine *el, Int c)
 571 {
 572
 573 #ifdef SDEBUG
 574         (void) fprintf(el->el_errfile, "dir %d patlen %d patbuf %s\n",
 575             c, el->el_search.patlen, ct_encode_string(el->el_search.patbuf));
 576 #endif
 577
 578         el->el_state.lastcmd = (el_action_t) c; /* Hack to stop c_setpat */
 579         el->el_line.lastchar = el->el_line.buffer;
 580
 581         switch (c) {
 582         case ED_SEARCH_NEXT_HISTORY:
 583                 return ed_search_next_history(el, 0);
 584         case ED_SEARCH_PREV_HISTORY:
 585                 return ed_search_prev_history(el, 0);
 586         default:
 587                 return CC_ERROR;
 588         }
 589 }
 590
 591
 592 /* cv_csearch():
 593  *      Vi character search
 594  */
 595 protected el_action_t
 596 cv_csearch(EditLine *el, int direction, Int ch, int count, int tflag)
 597 {
 598         Char *cp;
 599
 600         if (ch == 0)
 601                 return CC_ERROR;
 602
 603         if (ch == (Int)-1) {
 604                 Char c;
 605                 if (FUN(el,getc)(el, &c) != 1)
 606                         return ed_end_of_file(el, 0);
 607                 ch = c;
 608         }
 609
 610         /* Save for ';' and ',' commands */
 611         el->el_search.chacha = ch;
 612         el->el_search.chadir = direction;
 613         el->el_search.chatflg = (char)tflag;
 614
 615         cp = el->el_line.cursor;
 616         while (count--) {
 617                 if ((Int)*cp == ch)
 618                         cp += direction;
 619                 for (;;cp += direction) {
 620                         if (cp >= el->el_line.lastchar)
 621                                 return CC_ERROR;
 622                         if (cp < el->el_line.buffer)
 623                                 return CC_ERROR;
 624                         if ((Int)*cp == ch)
 625                                 break;
 626                 }
 627         }
 628
 629         if (tflag)
 630                 cp -= direction;
 631
 632         el->el_line.cursor = cp;
 633
 634         if (el->el_chared.c_vcmd.action != NOP) {
 635                 if (direction > 0)
 636                         el->el_line.cursor++;
 637                 cv_delfini(el);
 638                 return CC_REFRESH;
 639         }
 640         return CC_CURSOR;
 641 }