contrib/less-403/command.c

   1 /*
   2  * Copyright (C) 1984-2007  Mark Nudelman
   3  *
   4  * You may distribute under the terms of either the GNU General Public
   5  * License or the Less License, as specified in the README file.
   6  *
   7  * For more information about less, or for information on how to
   8  * contact the author, see the README file.
   9  */
  10
  11
  12 /*
  13  * User-level command processor.
  14  */
  15
  16 #include "less.h"
  17 #if MSDOS_COMPILER==WIN32C
  18 #include <windows.h>
  19 #endif
  20 #include "position.h"
  21 #include "option.h"
  22 #include "cmd.h"
  23
  24 extern int erase_char, erase2_char, kill_char;
  25 extern int sigs;
  26 extern int quit_if_one_screen;
  27 extern int squished;
  28 extern int hit_eof;
  29 extern int sc_width;
  30 extern int sc_height;
  31 extern int swindow;
  32 extern int jump_sline;
  33 extern int quitting;
  34 extern int wscroll;
  35 extern int top_scroll;
  36 extern int ignore_eoi;
  37 extern int secure;
  38 extern int hshift;
  39 extern int show_attn;
  40 extern char *every_first_cmd;
  41 extern char *curr_altfilename;
  42 extern char version[];
  43 extern struct scrpos initial_scrpos;
  44 extern IFILE curr_ifile;
  45 extern void constant *ml_search;
  46 extern void constant *ml_examine;
  47 #if SHELL_ESCAPE || PIPEC
  48 extern void constant *ml_shell;
  49 #endif
  50 #if EDITOR
  51 extern char *editor;
  52 extern char *editproto;
  53 #endif
  54 extern int screen_trashed;      /* The screen has been overwritten */
  55 extern int shift_count;
  56 extern int oldbot;
  57 extern int forw_prompt;
  58
  59 static char ungot[UNGOT_SIZE];
  60 static char *ungotp = NULL;
  61 #if SHELL_ESCAPE
  62 static char *shellcmd = NULL;   /* For holding last shell command for "!!" */
  63 #endif
  64 static int mca;                 /* The multicharacter command (action) */
  65 static int search_type;         /* The previous type of search */
  66 static LINENUM number;          /* The number typed by the user */
  67 static long fraction;           /* The fractional part of the number */
  68 static char optchar;
  69 static int optflag;
  70 static int optgetname;
  71 static POSITION bottompos;
  72 static int save_hshift;
  73 #if PIPEC
  74 static char pipec;
  75 #endif
  76
  77 static void multi_search();
  78
  79 /*
  80  * Move the cursor to start of prompt line before executing a command.
  81  * This looks nicer if the command takes a long time before
  82  * updating the screen.
  83  */
  84         static void
  85 cmd_exec()
  86 {
  87         clear_attn();
  88         line_left();
  89         flush();
  90 }
  91
  92 /*
  93  * Set up the display to start a new multi-character command.
  94  */
  95         static void
  96 start_mca(action, prompt, mlist, cmdflags)
  97         int action;
  98         char *prompt;
  99         void *mlist;
 100         int cmdflags;
 101 {
 102         mca = action;
 103         clear_bot();
 104         clear_cmd();
 105         cmd_putstr(prompt);
 106         set_mlist(mlist, cmdflags);
 107 }
 108
 109         public int
 110 in_mca()
 111 {
 112         return (mca != 0 && mca != A_PREFIX);
 113 }
 114
 115 /*
 116  * Set up the display to start a new search command.
 117  */
 118         static void
 119 mca_search()
 120 {
 121         if (search_type & SRCH_FORW)
 122                 mca = A_F_SEARCH;
 123         else
 124                 mca = A_B_SEARCH;
 125
 126         clear_bot();
 127         clear_cmd();
 128
 129         if (search_type & SRCH_NO_MATCH)
 130                 cmd_putstr("Non-match ");
 131         if (search_type & SRCH_FIRST_FILE)
 132                 cmd_putstr("First-file ");
 133         if (search_type & SRCH_PAST_EOF)
 134                 cmd_putstr("EOF-ignore ");
 135         if (search_type & SRCH_NO_MOVE)
 136                 cmd_putstr("Keep-pos ");
 137         if (search_type & SRCH_NO_REGEX)
 138                 cmd_putstr("Regex-off ");
 139
 140         if (search_type & SRCH_FORW)
 141                 cmd_putstr("/");
 142         else
 143                 cmd_putstr("?");
 144         set_mlist(ml_search, 0);
 145 }
 146
 147 /*
 148  * Set up the display to start a new toggle-option command.
 149  */
 150         static void
 151 mca_opt_toggle()
 152 {
 153         int no_prompt;
 154         int flag;
 155         char *dash;
 156
 157         no_prompt = (optflag & OPT_NO_PROMPT);
 158         flag = (optflag & ~OPT_NO_PROMPT);
 159         dash = (flag == OPT_NO_TOGGLE) ? "_" : "-";
 160
 161         mca = A_OPT_TOGGLE;
 162         clear_bot();
 163         clear_cmd();
 164         cmd_putstr(dash);
 165         if (optgetname)
 166                 cmd_putstr(dash);
 167         if (no_prompt)
 168                 cmd_putstr("(P)");
 169         switch (flag)
 170         {
 171         case OPT_UNSET:
 172                 cmd_putstr("+");
 173                 break;
 174         case OPT_SET:
 175                 cmd_putstr("!");
 176                 break;
 177         }
 178         set_mlist(NULL, 0);
 179 }
 180
 181 /*
 182  * Execute a multicharacter command.
 183  */
 184         static void
 185 exec_mca()
 186 {
 187         register char *cbuf;
 188
 189         cmd_exec();
 190         cbuf = get_cmdbuf();
 191
 192         switch (mca)
 193         {
 194         case A_F_SEARCH:
 195         case A_B_SEARCH:
 196                 multi_search(cbuf, (int) number);
 197                 break;
 198         case A_FIRSTCMD:
 199                 /*
 200                  * Skip leading spaces or + signs in the string.
 201                  */
 202                 while (*cbuf == '+' || *cbuf == ' ')
 203                         cbuf++;
 204                 if (every_first_cmd != NULL)
 205                         free(every_first_cmd);
 206                 if (*cbuf == '\0')
 207                         every_first_cmd = NULL;
 208                 else
 209                         every_first_cmd = save(cbuf);
 210                 break;
 211         case A_OPT_TOGGLE:
 212                 toggle_option(optchar, cbuf, optflag);
 213                 optchar = '\0';
 214                 break;
 215         case A_F_BRACKET:
 216                 match_brac(cbuf[0], cbuf[1], 1, (int) number);
 217                 break;
 218         case A_B_BRACKET:
 219                 match_brac(cbuf[1], cbuf[0], 0, (int) number);
 220                 break;
 221 #if EXAMINE
 222         case A_EXAMINE:
 223                 if (secure)
 224                         break;
 225                 edit_list(cbuf);
 226 #if TAGS
 227                 /* If tag structure is loaded then clean it up. */
 228                 cleantags();
 229 #endif
 230                 break;
 231 #endif
 232 #if SHELL_ESCAPE
 233         case A_SHELL:
 234                 /*
 235                  * !! just uses whatever is in shellcmd.
 236                  * Otherwise, copy cmdbuf to shellcmd,
 237                  * expanding any special characters ("%" or "#").
 238                  */
 239                 if (*cbuf != '!')
 240                 {
 241                         if (shellcmd != NULL)
 242                                 free(shellcmd);
 243                         shellcmd = fexpand(cbuf);
 244                 }
 245
 246                 if (secure)
 247                         break;
 248                 if (shellcmd == NULL)
 249                         lsystem("", "!done");
 250                 else
 251                         lsystem(shellcmd, "!done");
 252                 break;
 253 #endif
 254 #if PIPEC
 255         case A_PIPE:
 256                 if (secure)
 257                         break;
 258                 (void) pipe_mark(pipec, cbuf);
 259                 error("|done", NULL_PARG);
 260                 break;
 261 #endif
 262         }
 263 }
 264
 265 /*
 266  * Add a character to a multi-character command.
 267  */
 268         static int
 269 mca_char(c)
 270         int c;
 271 {
 272         char *p;
 273         int flag;
 274         char buf[3];
 275         PARG parg;
 276
 277         switch (mca)
 278         {
 279         case 0:
 280                 /*
 281                  * Not in a multicharacter command.
 282                  */
 283                 return (NO_MCA);
 284
 285         case A_PREFIX:
 286                 /*
 287                  * In the prefix of a command.
 288                  * This not considered a multichar command
 289                  * (even tho it uses cmdbuf, etc.).
 290                  * It is handled in the commands() switch.
 291                  */
 292                 return (NO_MCA);
 293
 294         case A_DIGIT:
 295                 /*
 296                  * Entering digits of a number.
 297                  * Terminated by a non-digit.
 298                  */
 299                 if (!((c >= '0' && c <= '9') || c == '.') &&
 300                   editchar(c, EC_PEEK|EC_NOHISTORY|EC_NOCOMPLETE|EC_NORIGHTLEFT) == A_INVALID)
 301                 {
 302                         /*
 303                          * Not part of the number.
 304                          * Treat as a normal command character.
 305                          */
 306                         number = cmd_int(&fraction);
 307                         mca = 0;
 308                         cmd_accept();
 309                         return (NO_MCA);
 310                 }
 311                 break;
 312
 313         case A_OPT_TOGGLE:
 314                 /*
 315                  * Special case for the TOGGLE_OPTION command.
 316                  * If the option letter which was entered is a
 317                  * single-char option, execute the command immediately,
 318                  * so user doesn't have to hit RETURN.
 319                  * If the first char is + or -, this indicates
 320                  * OPT_UNSET or OPT_SET respectively, instead of OPT_TOGGLE.
 321                  * "--" begins inputting a long option name.
 322                  */
 323                 if (optchar == '\0' && len_cmdbuf() == 0)
 324                 {
 325                         flag = (optflag & ~OPT_NO_PROMPT);
 326                         if (flag == OPT_NO_TOGGLE)
 327                         {
 328                                 switch (c)
 329                                 {
 330                                 case '_':
 331                                         /* "__" = long option name. */
 332                                         optgetname = TRUE;
 333                                         mca_opt_toggle();
 334                                         return (MCA_MORE);
 335                                 }
 336                         } else
 337                         {
 338                                 switch (c)
 339                                 {
 340                                 case '+':
 341                                         /* "-+" = UNSET. */
 342                                         optflag = (flag == OPT_UNSET) ?
 343                                                 OPT_TOGGLE : OPT_UNSET;
 344                                         mca_opt_toggle();
 345                                         return (MCA_MORE);
 346                                 case '!':
 347                                         /* "-!" = SET */
 348                                         optflag = (flag == OPT_SET) ?
 349                                                 OPT_TOGGLE : OPT_SET;
 350                                         mca_opt_toggle();
 351                                         return (MCA_MORE);
 352                                 case CONTROL('P'):
 353                                         optflag ^= OPT_NO_PROMPT;
 354                                         mca_opt_toggle();
 355                                         return (MCA_MORE);
 356                                 case '-':
 357                                         /* "--" = long option name. */
 358                                         optgetname = TRUE;
 359                                         mca_opt_toggle();
 360                                         return (MCA_MORE);
 361                                 }
 362                         }
 363                 }
 364                 if (optgetname)
 365                 {
 366                         /*
 367                          * We're getting a long option name.
 368                          * See if we've matched an option name yet.
 369                          * If so, display the complete name and stop
 370                          * accepting chars until user hits RETURN.
 371                          */
 372                         struct loption *o;
 373                         char *oname;
 374                         int lc;
 375
 376                         if (c == '\n' || c == '\r')
 377                         {
 378                                 /*
 379                                  * When the user hits RETURN, make sure
 380                                  * we've matched an option name, then
 381                                  * pretend he just entered the equivalent
 382                                  * option letter.
 383                                  */
 384                                 if (optchar == '\0')
 385                                 {
 386                                         parg.p_string = get_cmdbuf();
 387                                         error("There is no --%s option", &parg);
 388                                         return (MCA_DONE);
 389                                 }
 390                                 optgetname = FALSE;
 391                                 cmd_reset();
 392                                 c = optchar;
 393                         } else
 394                         {
 395                                 if (optchar != '\0')
 396                                 {
 397                                         /*
 398                                          * Already have a match for the name.
 399                                          * Don't accept anything but erase/kill.
 400                                          */
 401                                         if (c == erase_char ||
 402                                             c == erase2_char ||
 403                                             c == kill_char)
 404                                                 return (MCA_DONE);
 405                                         return (MCA_MORE);
 406                                 }
 407                                 /*
 408                                  * Add char to cmd buffer and try to match
 409                                  * the option name.
 410                                  */
 411                                 if (cmd_char(c) == CC_QUIT)
 412                                         return (MCA_DONE);
 413                                 p = get_cmdbuf();
 414                                 lc = ASCII_IS_LOWER(p[0]);
 415                                 o = findopt_name(&p, &oname, NULL);
 416                                 if (o != NULL)
 417                                 {
 418                                         /*
 419                                          * Got a match.
 420                                          * Remember the option letter and
 421                                          * display the full option name.
 422                                          */
 423                                         optchar = o->oletter;
 424                                         if (!lc && ASCII_IS_LOWER(optchar))
 425                                                 optchar = ASCII_TO_UPPER(optchar);
 426                                         cmd_reset();
 427                                         mca_opt_toggle();
 428                                         for (p = oname;  *p != '\0';  p++)
 429                                         {
 430                                                 c = *p;
 431                                                 if (!lc && ASCII_IS_LOWER(c))
 432                                                         c = ASCII_TO_UPPER(c);
 433                                                 if (cmd_char(c) != CC_OK)
 434                                                         return (MCA_DONE);
 435                                         }
 436                                 }
 437                                 return (MCA_MORE);
 438                         }
 439                 } else
 440                 {
 441                         if (c == erase_char || c == erase2_char || c == kill_char)
 442                                 break;
 443                         if (optchar != '\0')
 444                                 /* We already have the option letter. */
 445                                 break;
 446                 }
 447
 448                 optchar = c;
 449                 if ((optflag & ~OPT_NO_PROMPT) != OPT_TOGGLE ||
 450                     single_char_option(c))
 451                 {
 452                         toggle_option(c, "", optflag);
 453                         return (MCA_DONE);
 454                 }
 455                 /*
 456                  * Display a prompt appropriate for the option letter.
 457                  */
 458                 if ((p = opt_prompt(c)) == NULL)
 459                 {
 460                         buf[0] = '-';
 461                         buf[1] = c;
 462                         buf[2] = '\0';
 463                         p = buf;
 464                 }
 465                 start_mca(A_OPT_TOGGLE, p, (void*)NULL, 0);
 466                 return (MCA_MORE);
 467
 468         case A_F_SEARCH:
 469         case A_B_SEARCH:
 470                 /*
 471                  * Special case for search commands.
 472                  * Certain characters as the first char of
 473                  * the pattern have special meaning:
 474                  *      !  Toggle the NO_MATCH flag
 475                  *      *  Toggle the PAST_EOF flag
 476                  *      @  Toggle the FIRST_FILE flag
 477                  */
 478                 if (len_cmdbuf() > 0)
 479                         /*
 480                          * Only works for the first char of the pattern.
 481                          */
 482                         break;
 483
 484                 flag = 0;
 485                 switch (c)
 486                 {
 487                 case CONTROL('E'): /* ignore END of file */
 488                 case '*':
 489                         flag = SRCH_PAST_EOF;
 490                         break;
 491                 case CONTROL('F'): /* FIRST file */
 492                 case '@':
 493                         flag = SRCH_FIRST_FILE;
 494                         break;
 495                 case CONTROL('K'): /* KEEP position */
 496                         flag = SRCH_NO_MOVE;
 497                         break;
 498                 case CONTROL('R'): /* Don't use REGULAR EXPRESSIONS */
 499                         flag = SRCH_NO_REGEX;
 500                         break;
 501                 case CONTROL('N'): /* NOT match */
 502                 case '!':
 503                         flag = SRCH_NO_MATCH;
 504                         break;
 505                 }
 506                 if (flag != 0)
 507                 {
 508                         search_type ^= flag;
 509                         mca_search();
 510                         return (MCA_MORE);
 511                 }
 512                 break;
 513         }
 514
 515         /*
 516          * Any other multicharacter command
 517          * is terminated by a newline.
 518          */
 519         if (c == '\n' || c == '\r')
 520         {
 521                 /*
 522                  * Execute the command.
 523                  */
 524                 exec_mca();
 525                 return (MCA_DONE);
 526         }
 527
 528         /*
 529          * Append the char to the command buffer.
 530          */
 531         if (cmd_char(c) == CC_QUIT)
 532                 /*
 533                  * Abort the multi-char command.
 534                  */
 535                 return (MCA_DONE);
 536
 537         if ((mca == A_F_BRACKET || mca == A_B_BRACKET) && len_cmdbuf() >= 2)
 538         {
 539                 /*
 540                  * Special case for the bracket-matching commands.
 541                  * Execute the command after getting exactly two
 542                  * characters from the user.
 543                  */
 544                 exec_mca();
 545                 return (MCA_DONE);
 546         }
 547
 548         /*
 549          * Need another character.
 550          */
 551         return (MCA_MORE);
 552 }
 553
 554 /*
 555  * Make sure the screen is displayed.
 556  */
 557         static void
 558 make_display()
 559 {
 560         /*
 561          * If nothing is displayed yet, display starting from initial_scrpos.
 562          */
 563         if (empty_screen())
 564         {
 565                 if (initial_scrpos.pos == NULL_POSITION)
 566                         /*
 567                          * {{ Maybe this should be:
 568                          *    jump_loc(ch_zero(), jump_sline);
 569                          *    but this behavior seems rather unexpected
 570                          *    on the first screen. }}
 571                          */
 572                         jump_loc(ch_zero(), 1);
 573                 else
 574                         jump_loc(initial_scrpos.pos, initial_scrpos.ln);
 575         } else if (screen_trashed)
 576         {
 577                 int save_top_scroll;
 578                 save_top_scroll = top_scroll;
 579                 top_scroll = 1;
 580                 repaint();
 581                 top_scroll = save_top_scroll;
 582         }
 583 }
 584
 585 /*
 586  * Display the appropriate prompt.
 587  */
 588         static void
 589 prompt()
 590 {
 591         register char *p;
 592
 593         if (ungotp != NULL && ungotp > ungot)
 594         {
 595                 /*
 596                  * No prompt necessary if commands are from
 597                  * ungotten chars rather than from the user.
 598                  */
 599                 return;
 600         }
 601
 602         /*
 603          * Make sure the screen is displayed.
 604          */
 605         make_display();
 606         bottompos = position(BOTTOM_PLUS_ONE);
 607
 608         /*
 609          * If we've hit EOF on the last file, and the -E flag is set
 610          * (or -F is set and this is the first prompt), then quit.
 611          * {{ Relying on "first prompt" to detect a single-screen file
 612          * fails if +G is used, for example. }}
 613          */
 614         if ((get_quit_at_eof() == OPT_ONPLUS || quit_if_one_screen) &&
 615             hit_eof && !(ch_getflags() & CH_HELPFILE) &&
 616             next_ifile(curr_ifile) == NULL_IFILE)
 617                 quit(QUIT_OK);
 618         quit_if_one_screen = FALSE;
 619 #if 0 /* This doesn't work well because some "te"s clear the screen. */
 620         /*
 621          * If the -e flag is set and we've hit EOF on the last file,
 622          * and the file is squished (shorter than the screen), quit.
 623          */
 624         if (get_quit_at_eof() && squished &&
 625             next_ifile(curr_ifile) == NULL_IFILE)
 626                 quit(QUIT_OK);
 627 #endif
 628
 629 #if MSDOS_COMPILER==WIN32C
 630         /*
 631          * In Win32, display the file name in the window title.
 632          */
 633         if (!(ch_getflags() & CH_HELPFILE))
 634                 SetConsoleTitle(pr_expand("Less?f - %f.", 0));
 635 #endif
 636         /*
 637          * Select the proper prompt and display it.
 638          */
 639         /*
 640          * If the previous action was a forward movement,
 641          * don't clear the bottom line of the display;
 642          * just print the prompt since the forward movement guarantees
 643          * that we're in the right position to display the prompt.
 644          * Clearing the line could cause a problem: for example, if the last
 645          * line displayed ended at the right screen edge without a newline,
 646          * then clearing would clear the last displayed line rather than
 647          * the prompt line.
 648          */
 649         if (!forw_prompt)
 650                 clear_bot();
 651         clear_cmd();
 652         forw_prompt = 0;
 653         p = pr_string();
 654         if (p == NULL || *p == '\0')
 655                 putchr(':');
 656         else
 657         {
 658                 at_enter(AT_STANDOUT);
 659                 putstr(p);
 660                 at_exit();
 661         }
 662         clear_eol();
 663 }
 664
 665 /*
 666  * Display the less version message.
 667  */
 668         public void
 669 dispversion()
 670 {
 671         PARG parg;
 672
 673         parg.p_string = version;
 674         error("less %s", &parg);
 675 }
 676
 677 /*
 678  * Get command character.
 679  * The character normally comes from the keyboard,
 680  * but may come from ungotten characters
 681  * (characters previously given to ungetcc or ungetsc).
 682  */
 683         public int
 684 getcc()
 685 {
 686         if (ungotp == NULL)
 687                 /*
 688                  * Normal case: no ungotten chars, so get one from the user.
 689                  */
 690                 return (getchr());
 691
 692         if (ungotp > ungot)
 693                 /*
 694                  * Return the next ungotten char.
 695                  */
 696                 return (*--ungotp);
 697
 698         /*
 699          * We have just run out of ungotten chars.
 700          */
 701         ungotp = NULL;
 702         if (len_cmdbuf() == 0 || !empty_screen())
 703                 return (getchr());
 704         /*
 705          * Command is incomplete, so try to complete it.
 706          */
 707         switch (mca)
 708         {
 709         case A_DIGIT:
 710                 /*
 711                  * We have a number but no command.  Treat as #g.
 712                  */
 713                 return ('g');
 714
 715         case A_F_SEARCH:
 716         case A_B_SEARCH:
 717                 /*
 718                  * We have "/string" but no newline.  Add the \n.
 719                  */
 720                 return ('\n');
 721
 722         default:
 723                 /*
 724                  * Some other incomplete command.  Let user complete it.
 725                  */
 726                 return (getchr());
 727         }
 728 }
 729
 730 /*
 731  * "Unget" a command character.
 732  * The next getcc() will return this character.
 733  */
 734         public void
 735 ungetcc(c)
 736         int c;
 737 {
 738         if (ungotp == NULL)
 739                 ungotp = ungot;
 740         if (ungotp >= ungot + sizeof(ungot))
 741         {
 742                 error("ungetcc overflow", NULL_PARG);
 743                 quit(QUIT_ERROR);
 744         }
 745         *ungotp++ = c;
 746 }
 747
 748 /*
 749  * Unget a whole string of command characters.
 750  * The next sequence of getcc()'s will return this string.
 751  */
 752         public void
 753 ungetsc(s)
 754         char *s;
 755 {
 756         register char *p;
 757
 758         for (p = s + strlen(s) - 1;  p >= s;  p--)
 759                 ungetcc(*p);
 760 }
 761
 762 /*
 763  * Search for a pattern, possibly in multiple files.
 764  * If SRCH_FIRST_FILE is set, begin searching at the first file.
 765  * If SRCH_PAST_EOF is set, continue the search thru multiple files.
 766  */
 767         static void
 768 multi_search(pattern, n)
 769         char *pattern;
 770         int n;
 771 {
 772         register int nomore;
 773         IFILE save_ifile;
 774         int changed_file;
 775
 776         changed_file = 0;
 777         save_ifile = save_curr_ifile();
 778
 779         if (search_type & SRCH_FIRST_FILE)
 780         {
 781                 /*
 782                  * Start at the first (or last) file
 783                  * in the command line list.
 784                  */
 785                 if (search_type & SRCH_FORW)
 786                         nomore = edit_first();
 787                 else
 788                         nomore = edit_last();
 789                 if (nomore)
 790                 {
 791                         unsave_ifile(save_ifile);
 792                         return;
 793                 }
 794                 changed_file = 1;
 795                 search_type &= ~SRCH_FIRST_FILE;
 796         }
 797
 798         for (;;)
 799         {
 800                 n = search(search_type, pattern, n);
 801                 /*
 802                  * The SRCH_NO_MOVE flag doesn't "stick": it gets cleared
 803                  * after being used once.  This allows "n" to work after
 804                  * using a /@@ search.
 805                  */
 806                 search_type &= ~SRCH_NO_MOVE;
 807                 if (n == 0)
 808                 {
 809                         /*
 810                          * Found it.
 811                          */
 812                         unsave_ifile(save_ifile);
 813                         return;
 814                 }
 815
 816                 if (n < 0)
 817                         /*
 818                          * Some kind of error in the search.
 819                          * Error message has been printed by search().
 820                          */
 821                         break;
 822
 823                 if ((search_type & SRCH_PAST_EOF) == 0)
 824                         /*
 825                          * We didn't find a match, but we're
 826                          * supposed to search only one file.
 827                          */
 828                         break;
 829                 /*
 830                  * Move on to the next file.
 831                  */
 832                 if (search_type & SRCH_FORW)
 833                         nomore = edit_next(1);
 834                 else
 835                         nomore = edit_prev(1);
 836                 if (nomore)
 837                         break;
 838                 changed_file = 1;
 839         }
 840
 841         /*
 842          * Didn't find it.
 843          * Print an error message if we haven't already.
 844          */
 845         if (n > 0)
 846                 error("Pattern not found", NULL_PARG);
 847
 848         if (changed_file)
 849         {
 850                 /*
 851                  * Restore the file we were originally viewing.
 852                  */
 853                 reedit_ifile(save_ifile);
 854         } else
 855         {
 856                 unsave_ifile(save_ifile);
 857         }
 858 }
 859
 860 /*
 861  * Main command processor.
 862  * Accept and execute commands until a quit command.
 863  */
 864         public void
 865 commands()
 866 {
 867         register int c;
 868         register int action;
 869         register char *cbuf;
 870         int newaction;
 871         int save_search_type;
 872         char *extra;
 873         char tbuf[2];
 874         PARG parg;
 875         IFILE old_ifile;
 876         IFILE new_ifile;
 877         char *tagfile;
 878
 879         search_type = SRCH_FORW;
 880         wscroll = (sc_height + 1) / 2;
 881         newaction = A_NOACTION;
 882
 883         for (;;)
 884         {
 885                 mca = 0;
 886                 cmd_accept();
 887                 number = 0;
 888                 optchar = '\0';
 889
 890                 /*
 891                  * See if any signals need processing.
 892                  */
 893                 if (sigs)
 894                 {
 895                         psignals();
 896                         if (quitting)
 897                                 quit(QUIT_SAVED_STATUS);
 898                 }
 899
 900                 /*
 901                  * See if window size changed, for systems that don't
 902                  * generate SIGWINCH.
 903                  */
 904                 check_winch();
 905
 906                 /*
 907                  * Display prompt and accept a character.
 908                  */
 909                 cmd_reset();
 910                 prompt();
 911                 if (sigs)
 912                         continue;
 913                 if (newaction == A_NOACTION)
 914                         c = getcc();
 915
 916         again:
 917                 if (sigs)
 918                         continue;
 919
 920                 if (newaction != A_NOACTION)
 921                 {
 922                         action = newaction;
 923                         newaction = A_NOACTION;
 924                 } else
 925                 {
 926                         /*
 927                          * If we are in a multicharacter command, call mca_char.
 928                          * Otherwise we call fcmd_decode to determine the
 929                          * action to be performed.
 930                          */
 931                         if (mca)
 932                                 switch (mca_char(c))
 933                                 {
 934                                 case MCA_MORE:
 935                                         /*
 936                                          * Need another character.
 937                                          */
 938                                         c = getcc();
 939                                         goto again;
 940                                 case MCA_DONE:
 941                                         /*
 942                                          * Command has been handled by mca_char.
 943                                          * Start clean with a prompt.
 944                                          */
 945                                         continue;
 946                                 case NO_MCA:
 947                                         /*
 948                                          * Not a multi-char command
 949                                          * (at least, not anymore).
 950                                          */
 951                                         break;
 952                                 }
 953
 954                         /*
 955                          * Decode the command character and decide what to do.
 956                          */
 957                         if (mca)
 958                         {
 959                                 /*
 960                                  * We're in a multichar command.
 961                                  * Add the character to the command buffer
 962                                  * and display it on the screen.
 963                                  * If the user backspaces past the start
 964                                  * of the line, abort the command.
 965                                  */
 966                                 if (cmd_char(c) == CC_QUIT || len_cmdbuf() == 0)
 967                                         continue;
 968                                 cbuf = get_cmdbuf();
 969                         } else
 970                         {
 971                                 /*
 972                                  * Don't use cmd_char if we're starting fresh
 973                                  * at the beginning of a command, because we
 974                                  * don't want to echo the command until we know
 975                                  * it is a multichar command.  We also don't
 976                                  * want erase_char/kill_char to be treated
 977                                  * as line editing characters.
 978                                  */
 979                                 tbuf[0] = c;
 980                                 tbuf[1] = '\0';
 981                                 cbuf = tbuf;
 982                         }
 983                         extra = NULL;
 984                         action = fcmd_decode(cbuf, &extra);
 985                         /*
 986                          * If an "extra" string was returned,
 987                          * process it as a string of command characters.
 988                          */
 989                         if (extra != NULL)
 990                                 ungetsc(extra);
 991                 }
 992                 /*
 993                  * Clear the cmdbuf string.
 994                  * (But not if we're in the prefix of a command,
 995                  * because the partial command string is kept there.)
 996                  */
 997                 if (action != A_PREFIX)
 998                         cmd_reset();
 999
1000                 switch (action)
1001                 {
1002                 case A_DIGIT:
1003                         /*
1004                          * First digit of a number.
1005                          */
1006                         start_mca(A_DIGIT, ":", (void*)NULL, CF_QUIT_ON_ERASE);
1007                         goto again;
1008
1009                 case A_F_WINDOW:
1010                         /*
1011                          * Forward one window (and set the window size).
1012                          */
1013                         if (number > 0)
1014                                 swindow = (int) number;
1015                         /* FALLTHRU */
1016                 case A_F_SCREEN:
1017                         /*
1018                          * Forward one screen.
1019                          */
1020                         if (number <= 0)
1021                                 number = get_swindow();
1022                         cmd_exec();
1023                         if (show_attn)
1024                                 set_attnpos(bottompos);
1025                         forward((int) number, 0, 1);
1026                         break;
1027
1028                 case A_B_WINDOW:
1029                         /*
1030                          * Backward one window (and set the window size).
1031                          */
1032                         if (number > 0)
1033                                 swindow = (int) number;
1034                         /* FALLTHRU */
1035                 case A_B_SCREEN:
1036                         /*
1037                          * Backward one screen.
1038                          */
1039                         if (number <= 0)
1040                                 number = get_swindow();
1041                         cmd_exec();
1042                         backward((int) number, 0, 1);
1043                         break;
1044
1045                 case A_F_LINE:
1046                         /*
1047                          * Forward N (default 1) line.
1048                          */
1049                         if (number <= 0)
1050                                 number = 1;
1051                         cmd_exec();
1052                         if (show_attn == OPT_ONPLUS && number > 1)
1053                                 set_attnpos(bottompos);
1054                         forward((int) number, 0, 0);
1055                         break;
1056
1057                 case A_B_LINE:
1058                         /*
1059                          * Backward N (default 1) line.
1060                          */
1061                         if (number <= 0)
1062                                 number = 1;
1063                         cmd_exec();
1064                         backward((int) number, 0, 0);
1065                         break;
1066
1067                 case A_FF_LINE:
1068                         /*
1069                          * Force forward N (default 1) line.
1070                          */
1071                         if (number <= 0)
1072                                 number = 1;
1073                         cmd_exec();
1074                         if (show_attn == OPT_ONPLUS && number > 1)
1075                                 set_attnpos(bottompos);
1076                         forward((int) number, 1, 0);
1077                         break;
1078
1079                 case A_BF_LINE:
1080                         /*
1081                          * Force backward N (default 1) line.
1082                          */
1083                         if (number <= 0)
1084                                 number = 1;
1085                         cmd_exec();
1086                         backward((int) number, 1, 0);
1087                         break;
1088
1089                 case A_FF_SCREEN:
1090                         /*
1091                          * Force forward one screen.
1092                          */
1093                         if (number <= 0)
1094                                 number = get_swindow();
1095                         cmd_exec();
1096                         if (show_attn == OPT_ONPLUS)
1097                                 set_attnpos(bottompos);
1098                         forward((int) number, 1, 0);
1099                         break;
1100
1101                 case A_F_FOREVER:
1102                         /*
1103                          * Forward forever, ignoring EOF.
1104                          */
1105                         if (ch_getflags() & CH_HELPFILE)
1106                                 break;
1107                         cmd_exec();
1108                         jump_forw();
1109                         ignore_eoi = 1;
1110                         hit_eof = 0;
1111                         while (!sigs)
1112                                 forward(1, 0, 0);
1113                         ignore_eoi = 0;
1114                         /*
1115                          * This gets us back in "F mode" after processing
1116                          * a non-abort signal (e.g. window-change).
1117                          */
1118                         if (sigs && !ABORT_SIGS())
1119                                 newaction = A_F_FOREVER;
1120                         break;
1121
1122                 case A_F_SCROLL:
1123                         /*
1124                          * Forward N lines
1125                          * (default same as last 'd' or 'u' command).
1126                          */
1127                         if (number > 0)
1128                                 wscroll = (int) number;
1129                         cmd_exec();
1130                         if (show_attn == OPT_ONPLUS)
1131                                 set_attnpos(bottompos);
1132                         forward(wscroll, 0, 0);
1133                         break;
1134
1135                 case A_B_SCROLL:
1136                         /*
1137                          * Forward N lines
1138                          * (default same as last 'd' or 'u' command).
1139                          */
1140                         if (number > 0)
1141                                 wscroll = (int) number;
1142                         cmd_exec();
1143                         backward(wscroll, 0, 0);
1144                         break;
1145
1146                 case A_FREPAINT:
1147                         /*
1148                          * Flush buffers, then repaint screen.
1149                          * Don't flush the buffers on a pipe!
1150                          */
1151                         if (ch_getflags() & CH_CANSEEK)
1152                         {
1153                                 ch_flush();
1154                                 clr_linenum();
1155 #if HILITE_SEARCH
1156                                 clr_hilite();
1157 #endif
1158                         }
1159                         /* FALLTHRU */
1160                 case A_REPAINT:
1161                         /*
1162                          * Repaint screen.
1163                          */
1164                         cmd_exec();
1165                         repaint();
1166                         break;
1167
1168                 case A_GOLINE:
1169                         /*
1170                          * Go to line N, default beginning of file.
1171                          */
1172                         if (number <= 0)
1173                                 number = 1;
1174                         cmd_exec();
1175                         jump_back(number);
1176                         break;
1177
1178                 case A_PERCENT:
1179                         /*
1180                          * Go to a specified percentage into the file.
1181                          */
1182                         if (number < 0)
1183                         {
1184                                 number = 0;
1185                                 fraction = 0;
1186                         }
1187                         if (number > 100)
1188                         {
1189                                 number = 100;
1190                                 fraction = 0;
1191                         }
1192                         cmd_exec();
1193                         jump_percent((int) number, fraction);
1194                         break;
1195
1196                 case A_GOEND:
1197                         /*
1198                          * Go to line N, default end of file.
1199                          */
1200                         cmd_exec();
1201                         if (number <= 0)
1202                                 jump_forw();
1203                         else
1204                                 jump_back(number);
1205                         break;
1206
1207                 case A_GOPOS:
1208                         /*
1209                          * Go to a specified byte position in the file.
1210                          */
1211                         cmd_exec();
1212                         if (number < 0)
1213                                 number = 0;
1214                         jump_line_loc((POSITION) number, jump_sline);
1215                         break;
1216
1217                 case A_STAT:
1218                         /*
1219                          * Print file name, etc.
1220                          */
1221                         if (ch_getflags() & CH_HELPFILE)
1222                                 break;
1223                         cmd_exec();
1224                         parg.p_string = eq_message();
1225                         error("%s", &parg);
1226                         break;
1227
1228                 case A_VERSION:
1229                         /*
1230                          * Print version number, without the "@(#)".
1231                          */
1232                         cmd_exec();
1233                         dispversion();
1234                         break;
1235
1236                 case A_QUIT:
1237                         /*
1238                          * Exit.
1239                          */
1240                         if (curr_ifile != NULL_IFILE &&
1241                             ch_getflags() & CH_HELPFILE)
1242                         {
1243                                 /*
1244                                  * Quit while viewing the help file
1245                                  * just means return to viewing the
1246                                  * previous file.
1247                                  */
1248                                 hshift = save_hshift;
1249                                 if (edit_prev(1) == 0)
1250                                         break;
1251                         }
1252                         if (extra != NULL)
1253                                 quit(*extra);
1254                         quit(QUIT_OK);
1255                         break;
1256
1257 /*
1258  * Define abbreviation for a commonly used sequence below.
1259  */
1260 #define DO_SEARCH()     if (number <= 0) number = 1;    \
1261                         mca_search();                   \
1262                         cmd_exec();                     \
1263                         multi_search((char *)NULL, (int) number);
1264
1265
1266                 case A_F_SEARCH:
1267                         /*
1268                          * Search forward for a pattern.
1269                          * Get the first char of the pattern.
1270                          */
1271                         search_type = SRCH_FORW;
1272                         if (number <= 0)
1273                                 number = 1;
1274                         mca_search();
1275                         c = getcc();
1276                         goto again;
1277
1278                 case A_B_SEARCH:
1279                         /*
1280                          * Search backward for a pattern.
1281                          * Get the first char of the pattern.
1282                          */
1283                         search_type = SRCH_BACK;
1284                         if (number <= 0)
1285                                 number = 1;
1286                         mca_search();
1287                         c = getcc();
1288                         goto again;
1289
1290                 case A_AGAIN_SEARCH:
1291                         /*
1292                          * Repeat previous search.
1293                          */
1294                         DO_SEARCH();
1295                         break;
1296
1297                 case A_T_AGAIN_SEARCH:
1298                         /*
1299                          * Repeat previous search, multiple files.
1300                          */
1301                         search_type |= SRCH_PAST_EOF;
1302                         DO_SEARCH();
1303                         break;
1304
1305                 case A_REVERSE_SEARCH:
1306                         /*
1307                          * Repeat previous search, in reverse direction.
1308                          */
1309                         save_search_type = search_type;
1310                         search_type = SRCH_REVERSE(search_type);
1311                         DO_SEARCH();
1312                         search_type = save_search_type;
1313                         break;
1314
1315                 case A_T_REVERSE_SEARCH:
1316                         /*
1317                          * Repeat previous search,
1318                          * multiple files in reverse direction.
1319                          */
1320                         save_search_type = search_type;
1321                         search_type = SRCH_REVERSE(search_type);
1322                         search_type |= SRCH_PAST_EOF;
1323                         DO_SEARCH();
1324                         search_type = save_search_type;
1325                         break;
1326
1327                 case A_UNDO_SEARCH:
1328                         undo_search();
1329                         break;
1330
1331                 case A_HELP:
1332                         /*
1333                          * Help.
1334                          */
1335                         if (ch_getflags() & CH_HELPFILE)
1336                                 break;
1337                         cmd_exec();
1338                         save_hshift = hshift;
1339                         hshift = 0;
1340                         (void) edit(FAKE_HELPFILE);
1341                         break;
1342
1343                 case A_EXAMINE:
1344 #if EXAMINE
1345                         /*
1346                          * Edit a new file.  Get the filename.
1347                          */
1348                         if (secure)
1349                         {
1350                                 error("Command not available", NULL_PARG);
1351                                 break;
1352                         }
1353                         start_mca(A_EXAMINE, "Examine: ", ml_examine, 0);
1354                         c = getcc();
1355                         goto again;
1356 #else
1357                         error("Command not available", NULL_PARG);
1358                         break;
1359 #endif
1360
1361                 case A_VISUAL:
1362                         /*
1363                          * Invoke an editor on the input file.
1364                          */
1365 #if EDITOR
1366                         if (secure)
1367                         {
1368                                 error("Command not available", NULL_PARG);
1369                                 break;
1370                         }
1371                         if (ch_getflags() & CH_HELPFILE)
1372                                 break;
1373                         if (strcmp(get_filename(curr_ifile), "-") == 0)
1374                         {
1375                                 error("Cannot edit standard input", NULL_PARG);
1376                                 break;
1377                         }
1378                         if (curr_altfilename != NULL)
1379                         {
1380                                 error("WARNING: This file was viewed via LESSOPEN",
1381                                         NULL_PARG);
1382                         }
1383                         start_mca(A_SHELL, "!", ml_shell, 0);
1384                         /*
1385                          * Expand the editor prototype string
1386                          * and pass it to the system to execute.
1387                          * (Make sure the screen is displayed so the
1388                          * expansion of "+%lm" works.)
1389                          */
1390                         make_display();
1391                         cmd_exec();
1392                         lsystem(pr_expand(editproto, 0), (char*)NULL);
1393                         break;
1394 #else
1395                         error("Command not available", NULL_PARG);
1396                         break;
1397 #endif
1398
1399                 case A_NEXT_FILE:
1400                         /*
1401                          * Examine next file.
1402                          */
1403 #if TAGS
1404                         if (ntags())
1405                         {
1406                                 error("No next file", NULL_PARG);
1407                                 break;
1408                         }
1409 #endif
1410                         if (number <= 0)
1411                                 number = 1;
1412                         if (edit_next((int) number))
1413                         {
1414                                 if (get_quit_at_eof() && hit_eof &&
1415                                     !(ch_getflags() & CH_HELPFILE))
1416                                         quit(QUIT_OK);
1417                                 parg.p_string = (number > 1) ? "(N-th) " : "";
1418                                 error("No %snext file", &parg);
1419                         }
1420                         break;
1421
1422                 case A_PREV_FILE:
1423                         /*
1424                          * Examine previous file.
1425                          */
1426 #if TAGS
1427                         if (ntags())
1428                         {
1429                                 error("No previous file", NULL_PARG);
1430                                 break;
1431                         }
1432 #endif
1433                         if (number <= 0)
1434                                 number = 1;
1435                         if (edit_prev((int) number))
1436                         {
1437                                 parg.p_string = (number > 1) ? "(N-th) " : "";
1438                                 error("No %sprevious file", &parg);
1439                         }
1440                         break;
1441
1442                 case A_NEXT_TAG:
1443 #if TAGS
1444                         if (number <= 0)
1445                                 number = 1;
1446                         tagfile = nexttag((int) number);
1447                         if (tagfile == NULL)
1448                         {
1449                                 error("No next tag", NULL_PARG);
1450                                 break;
1451                         }
1452                         if (edit(tagfile) == 0)
1453                         {
1454                                 POSITION pos = tagsearch();
1455                                 if (pos != NULL_POSITION)
1456                                         jump_loc(pos, jump_sline);
1457                         }
1458 #else
1459                         error("Command not available", NULL_PARG);
1460 #endif
1461                         break;
1462
1463                 case A_PREV_TAG:
1464 #if TAGS
1465                         if (number <= 0)
1466                                 number = 1;
1467                         tagfile = prevtag((int) number);
1468                         if (tagfile == NULL)
1469                         {
1470                                 error("No previous tag", NULL_PARG);
1471                                 break;
1472                         }
1473                         if (edit(tagfile) == 0)
1474                         {
1475                                 POSITION pos = tagsearch();
1476                                 if (pos != NULL_POSITION)
1477                                         jump_loc(pos, jump_sline);
1478                         }
1479 #else
1480                         error("Command not available", NULL_PARG);
1481 #endif
1482                         break;
1483
1484                 case A_INDEX_FILE:
1485                         /*
1486                          * Examine a particular file.
1487                          */
1488                         if (number <= 0)
1489                                 number = 1;
1490                         if (edit_index((int) number))
1491                                 error("No such file", NULL_PARG);
1492                         break;
1493
1494                 case A_REMOVE_FILE:
1495                         if (ch_getflags() & CH_HELPFILE)
1496                                 break;
1497                         old_ifile = curr_ifile;
1498                         new_ifile = getoff_ifile(curr_ifile);
1499                         if (new_ifile == NULL_IFILE)
1500                         {
1501                                 bell();
1502                                 break;
1503                         }
1504                         if (edit_ifile(new_ifile) != 0)
1505                         {
1506                                 reedit_ifile(old_ifile);
1507                                 break;
1508                         }
1509                         del_ifile(old_ifile);
1510                         break;
1511
1512                 case A_OPT_TOGGLE:
1513                         optflag = OPT_TOGGLE;
1514                         optgetname = FALSE;
1515                         mca_opt_toggle();
1516                         c = getcc();
1517                         goto again;
1518
1519                 case A_DISP_OPTION:
1520                         /*
1521                          * Report a flag setting.
1522                          */
1523                         optflag = OPT_NO_TOGGLE;
1524                         optgetname = FALSE;
1525                         mca_opt_toggle();
1526                         c = getcc();
1527                         goto again;
1528
1529                 case A_FIRSTCMD:
1530                         /*
1531                          * Set an initial command for new files.
1532                          */
1533                         start_mca(A_FIRSTCMD, "+", (void*)NULL, 0);
1534                         c = getcc();
1535                         goto again;
1536
1537                 case A_SHELL:
1538                         /*
1539                          * Shell escape.
1540                          */
1541 #if SHELL_ESCAPE
1542                         if (secure)
1543                         {
1544                                 error("Command not available", NULL_PARG);
1545                                 break;
1546                         }
1547                         start_mca(A_SHELL, "!", ml_shell, 0);
1548                         c = getcc();
1549                         goto again;
1550 #else
1551                         error("Command not available", NULL_PARG);
1552                         break;
1553 #endif
1554
1555                 case A_SETMARK:
1556                         /*
1557                          * Set a mark.
1558                          */
1559                         if (ch_getflags() & CH_HELPFILE)
1560                                 break;
1561                         start_mca(A_SETMARK, "mark: ", (void*)NULL, 0);
1562                         c = getcc();
1563                         if (c == erase_char || c == erase2_char ||
1564                             c == kill_char || c == '\n' || c == '\r')
1565                                 break;
1566                         setmark(c);
1567                         break;
1568
1569                 case A_GOMARK:
1570                         /*
1571                          * Go to a mark.
1572                          */
1573                         start_mca(A_GOMARK, "goto mark: ", (void*)NULL, 0);
1574                         c = getcc();
1575                         if (c == erase_char || c == erase2_char ||
1576                             c == kill_char || c == '\n' || c == '\r')
1577                                 break;
1578                         gomark(c);
1579                         break;
1580
1581                 case A_PIPE:
1582 #if PIPEC
1583                         if (secure)
1584                         {
1585                                 error("Command not available", NULL_PARG);
1586                                 break;
1587                         }
1588                         start_mca(A_PIPE, "|mark: ", (void*)NULL, 0);
1589                         c = getcc();
1590                         if (c == erase_char || c == erase2_char || c == kill_char)
1591                                 break;
1592                         if (c == '\n' || c == '\r')
1593                                 c = '.';
1594                         if (badmark(c))
1595                                 break;
1596                         pipec = c;
1597                         start_mca(A_PIPE, "!", ml_shell, 0);
1598                         c = getcc();
1599                         goto again;
1600 #else
1601                         error("Command not available", NULL_PARG);
1602                         break;
1603 #endif
1604
1605                 case A_B_BRACKET:
1606                 case A_F_BRACKET:
1607                         start_mca(action, "Brackets: ", (void*)NULL, 0);
1608                         c = getcc();
1609                         goto again;
1610
1611                 case A_LSHIFT:
1612                         if (number > 0)
1613                                 shift_count = number;
1614                         else
1615                                 number = (shift_count > 0) ?
1616                                         shift_count : sc_width / 2;
1617                         if (number > hshift)
1618                                 number = hshift;
1619                         hshift -= number;
1620                         screen_trashed = 1;
1621                         break;
1622
1623                 case A_RSHIFT:
1624                         if (number > 0)
1625                                 shift_count = number;
1626                         else
1627                                 number = (shift_count > 0) ?
1628                                         shift_count : sc_width / 2;
1629                         hshift += number;
1630                         screen_trashed = 1;
1631                         break;
1632
1633                 case A_PREFIX:
1634                         /*
1635                          * The command is incomplete (more chars are needed).
1636                          * Display the current char, so the user knows
1637                          * what's going on, and get another character.
1638                          */
1639                         if (mca != A_PREFIX)
1640                         {
1641                                 cmd_reset();
1642                                 start_mca(A_PREFIX, " ", (void*)NULL,
1643                                         CF_QUIT_ON_ERASE);
1644                                 (void) cmd_char(c);
1645                         }
1646                         c = getcc();
1647                         goto again;
1648
1649                 case A_NOACTION:
1650                         break;
1651
1652                 default:
1653                         bell();
1654                         break;
1655                 }
1656         }
1657 }