command.c

   1 /*
   2  * Copyright (C) 1984-2014  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, see the README file.
   8  */
   9
  10
  11 /*
  12  * User-level command processor.
  13  */
  14
  15 #include "less.h"
  16 #if MSDOS_COMPILER==WIN32C
  17 #include <windows.h>
  18 #endif
  19 #include "position.h"
  20 #include "option.h"
  21 #include "cmd.h"
  22
  23 extern int erase_char, erase2_char, kill_char;
  24 extern int sigs;
  25 extern int quit_if_one_screen;
  26 extern int squished;
  27 extern int sc_width;
  28 extern int sc_height;
  29 extern int swindow;
  30 extern int jump_sline;
  31 extern int quitting;
  32 extern int wscroll;
  33 extern int top_scroll;
  34 extern int ignore_eoi;
  35 extern int secure;
  36 extern int hshift;
  37 extern int bs_mode;
  38 extern int show_attn;
  39 extern POSITION highest_hilite;
  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 extern int same_pos_bell;
  59
  60 #if SHELL_ESCAPE
  61 static char *shellcmd = NULL;   /* For holding last shell command for "!!" */
  62 #endif
  63 static int mca;                 /* The multicharacter command (action) */
  64 static int search_type;         /* The previous type of search */
  65 static LINENUM number;          /* The number typed by the user */
  66 static long fraction;           /* The fractional part of the number */
  67 static struct loption *curropt;
  68 static int opt_lower;
  69 static int optflag;
  70 static int optgetname;
  71 static POSITION bottompos;
  72 static int save_hshift;
  73 static int save_bs_mode;
  74 #if PIPEC
  75 static char pipec;
  76 #endif
  77
  78 struct ungot {
  79         struct ungot *ug_next;
  80         char ug_char;
  81 };
  82 static struct ungot* ungot = NULL;
  83 static int unget_end = 0;
  84
  85 static void multi_search();
  86
  87 /*
  88  * Move the cursor to start of prompt line before executing a command.
  89  * This looks nicer if the command takes a long time before
  90  * updating the screen.
  91  */
  92         static void
  93 cmd_exec()
  94 {
  95 #if HILITE_SEARCH
  96         clear_attn();
  97 #endif
  98         clear_bot();
  99         flush();
 100 }
 101
 102 /*
 103  * Set up the display to start a new multi-character command.
 104  */
 105         static void
 106 start_mca(action, prompt, mlist, cmdflags)
 107         int action;
 108         constant char *prompt;
 109         constant void *mlist;
 110         int cmdflags;
 111 {
 112         mca = action;
 113         clear_bot();
 114         clear_cmd();
 115         cmd_putstr(prompt);
 116         set_mlist(mlist, cmdflags);
 117 }
 118
 119         public int
 120 in_mca()
 121 {
 122         return (mca != 0 && mca != A_PREFIX);
 123 }
 124
 125 /*
 126  * Set up the display to start a new search command.
 127  */
 128         static void
 129 mca_search()
 130 {
 131 #if HILITE_SEARCH
 132         if (search_type & SRCH_FILTER)
 133                 mca = A_FILTER;
 134         else
 135 #endif
 136         if (search_type & SRCH_FORW)
 137                 mca = A_F_SEARCH;
 138         else
 139                 mca = A_B_SEARCH;
 140
 141         clear_bot();
 142         clear_cmd();
 143
 144         if (search_type & SRCH_NO_MATCH)
 145                 cmd_putstr("Non-match ");
 146         if (search_type & SRCH_FIRST_FILE)
 147                 cmd_putstr("First-file ");
 148         if (search_type & SRCH_PAST_EOF)
 149                 cmd_putstr("EOF-ignore ");
 150         if (search_type & SRCH_NO_MOVE)
 151                 cmd_putstr("Keep-pos ");
 152         if (search_type & SRCH_NO_REGEX)
 153                 cmd_putstr("Regex-off ");
 154
 155 #if HILITE_SEARCH
 156         if (search_type & SRCH_FILTER)
 157                 cmd_putstr("&/");
 158         else
 159 #endif
 160         if (search_type & SRCH_FORW)
 161                 cmd_putstr("/");
 162         else
 163                 cmd_putstr("?");
 164         set_mlist(ml_search, 0);
 165 }
 166
 167 /*
 168  * Set up the display to start a new toggle-option command.
 169  */
 170         static void
 171 mca_opt_toggle()
 172 {
 173         int no_prompt;
 174         int flag;
 175         char *dash;
 176
 177         no_prompt = (optflag & OPT_NO_PROMPT);
 178         flag = (optflag & ~OPT_NO_PROMPT);
 179         dash = (flag == OPT_NO_TOGGLE) ? "_" : "-";
 180
 181         mca = A_OPT_TOGGLE;
 182         clear_bot();
 183         clear_cmd();
 184         cmd_putstr(dash);
 185         if (optgetname)
 186                 cmd_putstr(dash);
 187         if (no_prompt)
 188                 cmd_putstr("(P)");
 189         switch (flag)
 190         {
 191         case OPT_UNSET:
 192                 cmd_putstr("+");
 193                 break;
 194         case OPT_SET:
 195                 cmd_putstr("!");
 196                 break;
 197         }
 198         set_mlist(NULL, 0);
 199 }
 200
 201 /*
 202  * Execute a multicharacter command.
 203  */
 204         static void
 205 exec_mca()
 206 {
 207         register char *cbuf;
 208
 209         cmd_exec();
 210         cbuf = get_cmdbuf();
 211
 212         switch (mca)
 213         {
 214         case A_F_SEARCH:
 215         case A_B_SEARCH:
 216                 multi_search(cbuf, (int) number, 0);
 217                 break;
 218 #if HILITE_SEARCH
 219         case A_FILTER:
 220                 search_type ^= SRCH_NO_MATCH;
 221                 set_filter_pattern(cbuf, search_type);
 222                 break;
 223 #endif
 224         case A_FIRSTCMD:
 225                 /*
 226                  * Skip leading spaces or + signs in the string.
 227                  */
 228                 while (*cbuf == '+' || *cbuf == ' ')
 229                         cbuf++;
 230                 if (every_first_cmd != NULL)
 231                         free(every_first_cmd);
 232                 if (*cbuf == '\0')
 233                         every_first_cmd = NULL;
 234                 else
 235                         every_first_cmd = save(cbuf);
 236                 break;
 237         case A_OPT_TOGGLE:
 238                 toggle_option(curropt, opt_lower, cbuf, optflag);
 239                 curropt = NULL;
 240                 break;
 241         case A_F_BRACKET:
 242                 match_brac(cbuf[0], cbuf[1], 1, (int) number);
 243                 break;
 244         case A_B_BRACKET:
 245                 match_brac(cbuf[1], cbuf[0], 0, (int) number);
 246                 break;
 247 #if EXAMINE
 248         case A_EXAMINE:
 249                 if (secure)
 250                         break;
 251                 edit_list(cbuf);
 252 #if TAGS
 253                 /* If tag structure is loaded then clean it up. */
 254                 cleantags();
 255 #endif
 256                 break;
 257 #endif
 258 #if SHELL_ESCAPE
 259         case A_SHELL:
 260                 /*
 261                  * !! just uses whatever is in shellcmd.
 262                  * Otherwise, copy cmdbuf to shellcmd,
 263                  * expanding any special characters ("%" or "#").
 264                  */
 265                 if (*cbuf != '!')
 266                 {
 267                         if (shellcmd != NULL)
 268                                 free(shellcmd);
 269                         shellcmd = fexpand(cbuf);
 270                 }
 271
 272                 if (secure)
 273                         break;
 274                 if (shellcmd == NULL)
 275                         lsystem("", "!done");
 276                 else
 277                         lsystem(shellcmd, "!done");
 278                 break;
 279 #endif
 280 #if PIPEC
 281         case A_PIPE:
 282                 if (secure)
 283                         break;
 284                 (void) pipe_mark(pipec, cbuf);
 285                 error("|done", NULL_PARG);
 286                 break;
 287 #endif
 288         }
 289 }
 290
 291 /*
 292  * Is a character an erase or kill char?
 293  */
 294         static int
 295 is_erase_char(c)
 296         int c;
 297 {
 298         return (c == erase_char || c == erase2_char || c == kill_char);
 299 }
 300
 301 /*
 302  * Handle the first char of an option (after the initial dash).
 303  */
 304         static int
 305 mca_opt_first_char(c)
 306     int c;
 307 {
 308         int flag = (optflag & ~OPT_NO_PROMPT);
 309         if (flag == OPT_NO_TOGGLE)
 310         {
 311                 switch (c)
 312                 {
 313                 case '_':
 314                         /* "__" = long option name. */
 315                         optgetname = TRUE;
 316                         mca_opt_toggle();
 317                         return (MCA_MORE);
 318                 }
 319         } else
 320         {
 321                 switch (c)
 322                 {
 323                 case '+':
 324                         /* "-+" = UNSET. */
 325                         optflag = (flag == OPT_UNSET) ?
 326                                 OPT_TOGGLE : OPT_UNSET;
 327                         mca_opt_toggle();
 328                         return (MCA_MORE);
 329                 case '!':
 330                         /* "-!" = SET */
 331                         optflag = (flag == OPT_SET) ?
 332                                 OPT_TOGGLE : OPT_SET;
 333                         mca_opt_toggle();
 334                         return (MCA_MORE);
 335                 case CONTROL('P'):
 336                         optflag ^= OPT_NO_PROMPT;
 337                         mca_opt_toggle();
 338                         return (MCA_MORE);
 339                 case '-':
 340                         /* "--" = long option name. */
 341                         optgetname = TRUE;
 342                         mca_opt_toggle();
 343                         return (MCA_MORE);
 344                 }
 345         }
 346         /* Char was not handled here. */
 347         return (NO_MCA);
 348 }
 349
 350 /*
 351  * Add a char to a long option name.
 352  * See if we've got a match for an option name yet.
 353  * If so, display the complete name and stop
 354  * accepting chars until user hits RETURN.
 355  */
 356         static int
 357 mca_opt_nonfirst_char(c)
 358         int c;
 359 {
 360         char *p;
 361         char *oname;
 362
 363         if (curropt != NULL)
 364         {
 365                 /*
 366                  * Already have a match for the name.
 367                  * Don't accept anything but erase/kill.
 368                  */
 369                 if (is_erase_char(c))
 370                         return (MCA_DONE);
 371                 return (MCA_MORE);
 372         }
 373         /*
 374          * Add char to cmd buffer and try to match
 375          * the option name.
 376          */
 377         if (cmd_char(c) == CC_QUIT)
 378                 return (MCA_DONE);
 379         p = get_cmdbuf();
 380         opt_lower = ASCII_IS_LOWER(p[0]);
 381         curropt = findopt_name(&p, &oname, NULL);
 382         if (curropt != NULL)
 383         {
 384                 /*
 385                  * Got a match.
 386                  * Remember the option and
 387                  * display the full option name.
 388                  */
 389                 cmd_reset();
 390                 mca_opt_toggle();
 391                 for (p = oname;  *p != '\0';  p++)
 392                 {
 393                         c = *p;
 394                         if (!opt_lower && ASCII_IS_LOWER(c))
 395                                 c = ASCII_TO_UPPER(c);
 396                         if (cmd_char(c) != CC_OK)
 397                                 return (MCA_DONE);
 398                 }
 399         }
 400         return (MCA_MORE);
 401 }
 402
 403 /*
 404  * Handle a char of an option toggle command.
 405  */
 406         static int
 407 mca_opt_char(c)
 408         int c;
 409 {
 410         PARG parg;
 411
 412         /*
 413          * This may be a short option (single char),
 414          * or one char of a long option name,
 415          * or one char of the option parameter.
 416          */
 417         if (curropt == NULL && len_cmdbuf() == 0)
 418         {
 419                 int ret = mca_opt_first_char(c);
 420                 if (ret != NO_MCA)
 421                         return (ret);
 422         }
 423         if (optgetname)
 424         {
 425                 /* We're getting a long option name.  */
 426                 if (c != '\n' && c != '\r')
 427                         return (mca_opt_nonfirst_char(c));
 428                 if (curropt == NULL)
 429                 {
 430                         parg.p_string = get_cmdbuf();
 431                         error("There is no --%s option", &parg);
 432                         return (MCA_DONE);
 433                 }
 434                 optgetname = FALSE;
 435                 cmd_reset();
 436         } else
 437         {
 438                 if (is_erase_char(c))
 439                         return (NO_MCA);
 440                 if (curropt != NULL)
 441                         /* We're getting the option parameter. */
 442                         return (NO_MCA);
 443                 curropt = findopt(c);
 444                 if (curropt == NULL)
 445                 {
 446                         parg.p_string = propt(c);
 447                         error("There is no %s option", &parg);
 448                         return (MCA_DONE);
 449                 }
 450         }
 451         /*
 452          * If the option which was entered does not take a
 453          * parameter, toggle the option immediately,
 454          * so user doesn't have to hit RETURN.
 455          */
 456         if ((optflag & ~OPT_NO_PROMPT) != OPT_TOGGLE ||
 457             !opt_has_param(curropt))
 458         {
 459                 toggle_option(curropt, ASCII_IS_LOWER(c), "", optflag);
 460                 return (MCA_DONE);
 461         }
 462         /*
 463          * Display a prompt appropriate for the option parameter.
 464          */
 465         start_mca(A_OPT_TOGGLE, opt_prompt(curropt), (void*)NULL, 0);
 466         return (MCA_MORE);
 467 }
 468
 469 /*
 470  * Handle a char of a search command.
 471  */
 472         static int
 473 mca_search_char(c)
 474         int c;
 475 {
 476         int flag = 0;
 477
 478         /*
 479          * Certain characters as the first char of
 480          * the pattern have special meaning:
 481          *      !  Toggle the NO_MATCH flag
 482          *      *  Toggle the PAST_EOF flag
 483          *      @  Toggle the FIRST_FILE flag
 484          */
 485         if (len_cmdbuf() > 0)
 486                 return (NO_MCA);
 487
 488         switch (c)
 489         {
 490         case CONTROL('E'): /* ignore END of file */
 491         case '*':
 492                 if (mca != A_FILTER)
 493                         flag = SRCH_PAST_EOF;
 494                 break;
 495         case CONTROL('F'): /* FIRST file */
 496         case '@':
 497                 if (mca != A_FILTER)
 498                         flag = SRCH_FIRST_FILE;
 499                 break;
 500         case CONTROL('K'): /* KEEP position */
 501                 if (mca != A_FILTER)
 502                         flag = SRCH_NO_MOVE;
 503                 break;
 504         case CONTROL('R'): /* Don't use REGULAR EXPRESSIONS */
 505                 flag = SRCH_NO_REGEX;
 506                 break;
 507         case CONTROL('N'): /* NOT match */
 508         case '!':
 509                 flag = SRCH_NO_MATCH;
 510                 break;
 511         }
 512
 513         if (flag != 0)
 514         {
 515                 search_type ^= flag;
 516                 mca_search();
 517                 return (MCA_MORE);
 518         }
 519         return (NO_MCA);
 520 }
 521
 522 /*
 523  * Handle a character of a multi-character command.
 524  */
 525         static int
 526 mca_char(c)
 527         int c;
 528 {
 529         char *cbuf;
 530         int ret;
 531
 532         switch (mca)
 533         {
 534         case 0:
 535                 /*
 536                  * We're not in a multicharacter command.
 537                  */
 538                 return (NO_MCA);
 539
 540         case A_PREFIX:
 541                 /*
 542                  * In the prefix of a command.
 543                  * This not considered a multichar command
 544                  * (even tho it uses cmdbuf, etc.).
 545                  * It is handled in the commands() switch.
 546                  */
 547                 return (NO_MCA);
 548
 549         case A_DIGIT:
 550                 /*
 551                  * Entering digits of a number.
 552                  * Terminated by a non-digit.
 553                  */
 554                 if (!((c >= '0' && c <= '9') || c == '.') &&
 555                   editchar(c, EC_PEEK|EC_NOHISTORY|EC_NOCOMPLETE|EC_NORIGHTLEFT) == A_INVALID)
 556                 {
 557                         /*
 558                          * Not part of the number.
 559                          * End the number and treat this char
 560                          * as a normal command character.
 561                          */
 562                         number = cmd_int(&fraction);
 563                         mca = 0;
 564                         cmd_accept();
 565                         return (NO_MCA);
 566                 }
 567                 break;
 568
 569         case A_OPT_TOGGLE:
 570                 ret = mca_opt_char(c);
 571                 if (ret != NO_MCA)
 572                         return (ret);
 573                 break;
 574
 575         case A_F_SEARCH:
 576         case A_B_SEARCH:
 577         case A_FILTER:
 578                 ret = mca_search_char(c);
 579                 if (ret != NO_MCA)
 580                         return (ret);
 581                 break;
 582
 583         default:
 584                 /* Other multicharacter command. */
 585                 break;
 586         }
 587
 588         /*
 589          * The multichar command is terminated by a newline.
 590          */
 591         if (c == '\n' || c == '\r')
 592         {
 593                 /*
 594                  * Execute the command.
 595                  */
 596                 exec_mca();
 597                 return (MCA_DONE);
 598         }
 599
 600         /*
 601          * Append the char to the command buffer.
 602          */
 603         if (cmd_char(c) == CC_QUIT)
 604                 /*
 605                  * Abort the multi-char command.
 606                  */
 607                 return (MCA_DONE);
 608
 609         if ((mca == A_F_BRACKET || mca == A_B_BRACKET) && len_cmdbuf() >= 2)
 610         {
 611                 /*
 612                  * Special case for the bracket-matching commands.
 613                  * Execute the command after getting exactly two
 614                  * characters from the user.
 615                  */
 616                 exec_mca();
 617                 return (MCA_DONE);
 618         }
 619
 620         /*
 621          * Need another character.
 622          */
 623         return (MCA_MORE);
 624 }
 625
 626 /*
 627  * Discard any buffered file data.
 628  */
 629         static void
 630 clear_buffers()
 631 {
 632         if (!(ch_getflags() & CH_CANSEEK))
 633                 return;
 634         ch_flush();
 635         clr_linenum();
 636 #if HILITE_SEARCH
 637         clr_hilite();
 638 #endif
 639 }
 640
 641 /*
 642  * Make sure the screen is displayed.
 643  */
 644         static void
 645 make_display()
 646 {
 647         /*
 648          * If nothing is displayed yet, display starting from initial_scrpos.
 649          */
 650         if (empty_screen())
 651         {
 652                 if (initial_scrpos.pos == NULL_POSITION)
 653                         /*
 654                          * {{ Maybe this should be:
 655                          *    jump_loc(ch_zero(), jump_sline);
 656                          *    but this behavior seems rather unexpected
 657                          *    on the first screen. }}
 658                          */
 659                         jump_loc(ch_zero(), 1);
 660                 else
 661                         jump_loc(initial_scrpos.pos, initial_scrpos.ln);
 662         } else if (screen_trashed)
 663         {
 664                 int save_top_scroll = top_scroll;
 665                 int save_ignore_eoi = ignore_eoi;
 666                 top_scroll = 1;
 667                 ignore_eoi = 0;
 668                 if (screen_trashed == 2)
 669                 {
 670                         /* Special case used by ignore_eoi: re-open the input file
 671                          * and jump to the end of the file. */
 672                         reopen_curr_ifile();
 673                         jump_forw();
 674                 }
 675                 repaint();
 676                 top_scroll = save_top_scroll;
 677                 ignore_eoi = save_ignore_eoi;
 678         }
 679 }
 680
 681 /*
 682  * Display the appropriate prompt.
 683  */
 684         static void
 685 prompt()
 686 {
 687         register constant char *p;
 688
 689         if (ungot != NULL)
 690         {
 691                 /*
 692                  * No prompt necessary if commands are from
 693                  * ungotten chars rather than from the user.
 694                  */
 695                 return;
 696         }
 697
 698         /*
 699          * Make sure the screen is displayed.
 700          */
 701         make_display();
 702         bottompos = position(BOTTOM_PLUS_ONE);
 703
 704         /*
 705          * If we've hit EOF on the last file and the -E flag is set, quit.
 706          */
 707         if (get_quit_at_eof() == OPT_ONPLUS &&
 708             eof_displayed() && !(ch_getflags() & CH_HELPFILE) &&
 709             next_ifile(curr_ifile) == NULL_IFILE)
 710                 quit(QUIT_OK);
 711
 712         /*
 713          * If the entire file is displayed and the -F flag is set, quit.
 714          */
 715         if (quit_if_one_screen &&
 716             entire_file_displayed() && !(ch_getflags() & CH_HELPFILE) &&
 717             next_ifile(curr_ifile) == NULL_IFILE)
 718                 quit(QUIT_OK);
 719
 720 #if MSDOS_COMPILER==WIN32C
 721         /*
 722          * In Win32, display the file name in the window title.
 723          */
 724         if (!(ch_getflags() & CH_HELPFILE))
 725                 SetConsoleTitle(pr_expand("Less?f - %f.", 0));
 726 #endif
 727         /*
 728          * Select the proper prompt and display it.
 729          */
 730         /*
 731          * If the previous action was a forward movement,
 732          * don't clear the bottom line of the display;
 733          * just print the prompt since the forward movement guarantees
 734          * that we're in the right position to display the prompt.
 735          * Clearing the line could cause a problem: for example, if the last
 736          * line displayed ended at the right screen edge without a newline,
 737          * then clearing would clear the last displayed line rather than
 738          * the prompt line.
 739          */
 740         if (!forw_prompt)
 741                 clear_bot();
 742         clear_cmd();
 743         forw_prompt = 0;
 744         p = pr_string();
 745         if (is_filtering())
 746                 putstr("& ");
 747         if (p == NULL || *p == '\0')
 748                 putchr(':');
 749         else
 750         {
 751                 at_enter(AT_STANDOUT);
 752                 putstr(p);
 753                 at_exit();
 754         }
 755         clear_eol();
 756 }
 757
 758 /*
 759  * Display the less version message.
 760  */
 761         public void
 762 dispversion()
 763 {
 764         PARG parg;
 765
 766         parg.p_string = version;
 767         error("less %s", &parg);
 768 }
 769
 770 /*
 771  * Get command character.
 772  * The character normally comes from the keyboard,
 773  * but may come from ungotten characters
 774  * (characters previously given to ungetcc or ungetsc).
 775  */
 776         public int
 777 getcc()
 778 {
 779         if (unget_end)
 780         {
 781                 /*
 782                  * We have just run out of ungotten chars.
 783                  */
 784                 unget_end = 0;
 785                 if (len_cmdbuf() == 0)
 786                         return (getchr());
 787                 /*
 788                  * Command is incomplete, so try to complete it.
 789                  */
 790                 switch (mca)
 791                 {
 792                 case A_DIGIT:
 793                         /*
 794                          * We have a number but no command.  Treat as #g.
 795                          */
 796                         return ('g');
 797
 798                 case A_F_SEARCH:
 799                 case A_B_SEARCH:
 800                         /*
 801                          * We have "/string" but no newline.  Add the \n.
 802                          */
 803                         return ('\n');
 804
 805                 default:
 806                         /*
 807                          * Some other incomplete command.  Let user complete it.
 808                          */
 809                         return (getchr());
 810                 }
 811         }
 812
 813         if (ungot == NULL)
 814         {
 815                 /*
 816                  * Normal case: no ungotten chars, so get one from the user.
 817                  */
 818                 return (getchr());
 819         }
 820
 821         /*
 822          * Return the next ungotten char.
 823          */
 824         {
 825                 struct ungot *ug = ungot;
 826                 char c = ug->ug_char;
 827                 ungot = ug->ug_next;
 828                 free(ug);
 829                 unget_end = (ungot == NULL);
 830                 return (c);
 831         }
 832 }
 833
 834 /*
 835  * "Unget" a command character.
 836  * The next getcc() will return this character.
 837  */
 838         public void
 839 ungetcc(c)
 840         int c;
 841 {
 842         struct ungot *ug = (struct ungot *) ecalloc(1, sizeof(struct ungot));
 843
 844         ug->ug_char = c;
 845         ug->ug_next = ungot;
 846         ungot = ug;
 847         unget_end = 0;
 848 }
 849
 850 /*
 851  * Unget a whole string of command characters.
 852  * The next sequence of getcc()'s will return this string.
 853  */
 854         public void
 855 ungetsc(s)
 856         char *s;
 857 {
 858         register char *p;
 859
 860         for (p = s + strlen(s) - 1;  p >= s;  p--)
 861                 ungetcc(*p);
 862 }
 863
 864 /*
 865  * Search for a pattern, possibly in multiple files.
 866  * If SRCH_FIRST_FILE is set, begin searching at the first file.
 867  * If SRCH_PAST_EOF is set, continue the search thru multiple files.
 868  */
 869         static void
 870 multi_search(pattern, n, silent)
 871         char *pattern;
 872         int n;
 873         int silent;
 874 {
 875         register int nomore;
 876         IFILE save_ifile;
 877         int changed_file;
 878
 879         changed_file = 0;
 880         save_ifile = save_curr_ifile();
 881
 882         if (search_type & SRCH_FIRST_FILE)
 883         {
 884                 /*
 885                  * Start at the first (or last) file
 886                  * in the command line list.
 887                  */
 888                 if (search_type & SRCH_FORW)
 889                         nomore = edit_first();
 890                 else
 891                         nomore = edit_last();
 892                 if (nomore)
 893                 {
 894                         unsave_ifile(save_ifile);
 895                         return;
 896                 }
 897                 changed_file = 1;
 898                 search_type &= ~SRCH_FIRST_FILE;
 899         }
 900
 901         for (;;)
 902         {
 903                 n = search(search_type, pattern, n);
 904                 /*
 905                  * The SRCH_NO_MOVE flag doesn't "stick": it gets cleared
 906                  * after being used once.  This allows "n" to work after
 907                  * using a /@@ search.
 908                  */
 909                 search_type &= ~SRCH_NO_MOVE;
 910                 if (n == 0)
 911                 {
 912                         /*
 913                          * Found it.
 914                          */
 915                         unsave_ifile(save_ifile);
 916                         return;
 917                 }
 918
 919                 if (n < 0)
 920                         /*
 921                          * Some kind of error in the search.
 922                          * Error message has been printed by search().
 923                          */
 924                         break;
 925
 926                 if ((search_type & SRCH_PAST_EOF) == 0)
 927                         /*
 928                          * We didn't find a match, but we're
 929                          * supposed to search only one file.
 930                          */
 931                         break;
 932                 /*
 933                  * Move on to the next file.
 934                  */
 935                 if (search_type & SRCH_FORW)
 936                         nomore = edit_next(1);
 937                 else
 938                         nomore = edit_prev(1);
 939                 if (nomore)
 940                         break;
 941                 changed_file = 1;
 942         }
 943
 944         /*
 945          * Didn't find it.
 946          * Print an error message if we haven't already.
 947          */
 948         if (n > 0 && !silent)
 949                 error("Pattern not found", NULL_PARG);
 950
 951         if (changed_file)
 952         {
 953                 /*
 954                  * Restore the file we were originally viewing.
 955                  */
 956                 reedit_ifile(save_ifile);
 957         } else
 958         {
 959                 unsave_ifile(save_ifile);
 960         }
 961 }
 962
 963 /*
 964  * Forward forever, or until a highlighted line appears.
 965  */
 966         static int
 967 forw_loop(until_hilite)
 968         int until_hilite;
 969 {
 970         POSITION curr_len;
 971
 972         if (ch_getflags() & CH_HELPFILE)
 973                 return (A_NOACTION);
 974
 975         cmd_exec();
 976         jump_forw_buffered();
 977         curr_len = ch_length();
 978         highest_hilite = until_hilite ? curr_len : NULL_POSITION;
 979         ignore_eoi = 1;
 980         while (!sigs)
 981         {
 982                 if (until_hilite && highest_hilite > curr_len)
 983                 {
 984                         bell();
 985                         break;
 986                 }
 987                 make_display();
 988                 forward(1, 0, 0);
 989         }
 990         ignore_eoi = 0;
 991         ch_set_eof();
 992
 993         /*
 994          * This gets us back in "F mode" after processing
 995          * a non-abort signal (e.g. window-change).
 996          */
 997         if (sigs && !ABORT_SIGS())
 998                 return (until_hilite ? A_F_UNTIL_HILITE : A_F_FOREVER);
 999
1000         return (A_NOACTION);
1001 }
1002
1003 /*
1004  * Main command processor.
1005  * Accept and execute commands until a quit command.
1006  */
1007         public void
1008 commands()
1009 {
1010         register int c;
1011         register int action;
1012         register char *cbuf;
1013         int newaction;
1014         int save_search_type;
1015         char *extra;
1016         char tbuf[2];
1017         PARG parg;
1018         IFILE old_ifile;
1019         IFILE new_ifile;
1020         char *tagfile;
1021
1022         search_type = SRCH_FORW;
1023         wscroll = (sc_height + 1) / 2;
1024         newaction = A_NOACTION;
1025
1026         for (;;)
1027         {
1028                 mca = 0;
1029                 cmd_accept();
1030                 number = 0;
1031                 curropt = NULL;
1032
1033                 /*
1034                  * See if any signals need processing.
1035                  */
1036                 if (sigs)
1037                 {
1038                         psignals();
1039                         if (quitting)
1040                                 quit(QUIT_SAVED_STATUS);
1041                 }
1042
1043                 /*
1044                  * See if window size changed, for systems that don't
1045                  * generate SIGWINCH.
1046                  */
1047                 check_winch();
1048
1049                 /*
1050                  * Display prompt and accept a character.
1051                  */
1052                 cmd_reset();
1053                 prompt();
1054                 if (sigs)
1055                         continue;
1056                 if (newaction == A_NOACTION)
1057                         c = getcc();
1058
1059         again:
1060                 if (sigs)
1061                         continue;
1062
1063                 if (newaction != A_NOACTION)
1064                 {
1065                         action = newaction;
1066                         newaction = A_NOACTION;
1067                 } else
1068                 {
1069                         /*
1070                          * If we are in a multicharacter command, call mca_char.
1071                          * Otherwise we call fcmd_decode to determine the
1072                          * action to be performed.
1073                          */
1074                         if (mca)
1075                                 switch (mca_char(c))
1076                                 {
1077                                 case MCA_MORE:
1078                                         /*
1079                                          * Need another character.
1080                                          */
1081                                         c = getcc();
1082                                         goto again;
1083                                 case MCA_DONE:
1084                                         /*
1085                                          * Command has been handled by mca_char.
1086                                          * Start clean with a prompt.
1087                                          */
1088                                         continue;
1089                                 case NO_MCA:
1090                                         /*
1091                                          * Not a multi-char command
1092                                          * (at least, not anymore).
1093                                          */
1094                                         break;
1095                                 }
1096
1097                         /*
1098                          * Decode the command character and decide what to do.
1099                          */
1100                         if (mca)
1101                         {
1102                                 /*
1103                                  * We're in a multichar command.
1104                                  * Add the character to the command buffer
1105                                  * and display it on the screen.
1106                                  * If the user backspaces past the start
1107                                  * of the line, abort the command.
1108                                  */
1109                                 if (cmd_char(c) == CC_QUIT || len_cmdbuf() == 0)
1110                                         continue;
1111                                 cbuf = get_cmdbuf();
1112                         } else
1113                         {
1114                                 /*
1115                                  * Don't use cmd_char if we're starting fresh
1116                                  * at the beginning of a command, because we
1117                                  * don't want to echo the command until we know
1118                                  * it is a multichar command.  We also don't
1119                                  * want erase_char/kill_char to be treated
1120                                  * as line editing characters.
1121                                  */
1122                                 tbuf[0] = c;
1123                                 tbuf[1] = '\0';
1124                                 cbuf = tbuf;
1125                         }
1126                         extra = NULL;
1127                         action = fcmd_decode(cbuf, &extra);
1128                         /*
1129                          * If an "extra" string was returned,
1130                          * process it as a string of command characters.
1131                          */
1132                         if (extra != NULL)
1133                                 ungetsc(extra);
1134                 }
1135                 /*
1136                  * Clear the cmdbuf string.
1137                  * (But not if we're in the prefix of a command,
1138                  * because the partial command string is kept there.)
1139                  */
1140                 if (action != A_PREFIX)
1141                         cmd_reset();
1142
1143                 switch (action)
1144                 {
1145                 case A_DIGIT:
1146                         /*
1147                          * First digit of a number.
1148                          */
1149                         start_mca(A_DIGIT, ":", (void*)NULL, CF_QUIT_ON_ERASE);
1150                         goto again;
1151
1152                 case A_F_WINDOW:
1153                         /*
1154                          * Forward one window (and set the window size).
1155                          */
1156                         if (number > 0)
1157                                 swindow = (int) number;
1158                         /* FALLTHRU */
1159                 case A_F_SCREEN:
1160                         /*
1161                          * Forward one screen.
1162                          */
1163                         if (number <= 0)
1164                                 number = get_swindow();
1165                         cmd_exec();
1166                         if (show_attn)
1167                                 set_attnpos(bottompos);
1168                         forward((int) number, 0, 1);
1169                         break;
1170
1171                 case A_B_WINDOW:
1172                         /*
1173                          * Backward one window (and set the window size).
1174                          */
1175                         if (number > 0)
1176                                 swindow = (int) number;
1177                         /* FALLTHRU */
1178                 case A_B_SCREEN:
1179                         /*
1180                          * Backward one screen.
1181                          */
1182                         if (number <= 0)
1183                                 number = get_swindow();
1184                         cmd_exec();
1185                         backward((int) number, 0, 1);
1186                         break;
1187
1188                 case A_F_LINE:
1189                         /*
1190                          * Forward N (default 1) line.
1191                          */
1192                         if (number <= 0)
1193                                 number = 1;
1194                         cmd_exec();
1195                         if (show_attn == OPT_ONPLUS && number > 1)
1196                                 set_attnpos(bottompos);
1197                         forward((int) number, 0, 0);
1198                         break;
1199
1200                 case A_B_LINE:
1201                         /*
1202                          * Backward N (default 1) line.
1203                          */
1204                         if (number <= 0)
1205                                 number = 1;
1206                         cmd_exec();
1207                         backward((int) number, 0, 0);
1208                         break;
1209
1210                 case A_FF_LINE:
1211                         /*
1212                          * Force forward N (default 1) line.
1213                          */
1214                         if (number <= 0)
1215                                 number = 1;
1216                         cmd_exec();
1217                         if (show_attn == OPT_ONPLUS && number > 1)
1218                                 set_attnpos(bottompos);
1219                         forward((int) number, 1, 0);
1220                         break;
1221
1222                 case A_BF_LINE:
1223                         /*
1224                          * Force backward N (default 1) line.
1225                          */
1226                         if (number <= 0)
1227                                 number = 1;
1228                         cmd_exec();
1229                         backward((int) number, 1, 0);
1230                         break;
1231
1232                 case A_FF_SCREEN:
1233                         /*
1234                          * Force forward one screen.
1235                          */
1236                         if (number <= 0)
1237                                 number = get_swindow();
1238                         cmd_exec();
1239                         if (show_attn == OPT_ONPLUS)
1240                                 set_attnpos(bottompos);
1241                         forward((int) number, 1, 0);
1242                         break;
1243
1244                 case A_F_FOREVER:
1245                         /*
1246                          * Forward forever, ignoring EOF.
1247                          */
1248                         if (show_attn)
1249                                 set_attnpos(bottompos);
1250                         newaction = forw_loop(0);
1251                         break;
1252
1253                 case A_F_UNTIL_HILITE:
1254                         newaction = forw_loop(1);
1255                         break;
1256
1257                 case A_F_SCROLL:
1258                         /*
1259                          * Forward N lines
1260                          * (default same as last 'd' or 'u' command).
1261                          */
1262                         if (number > 0)
1263                                 wscroll = (int) number;
1264                         cmd_exec();
1265                         if (show_attn == OPT_ONPLUS)
1266                                 set_attnpos(bottompos);
1267                         forward(wscroll, 0, 0);
1268                         break;
1269
1270                 case A_B_SCROLL:
1271                         /*
1272                          * Forward N lines
1273                          * (default same as last 'd' or 'u' command).
1274                          */
1275                         if (number > 0)
1276                                 wscroll = (int) number;
1277                         cmd_exec();
1278                         backward(wscroll, 0, 0);
1279                         break;
1280
1281                 case A_FREPAINT:
1282                         /*
1283                          * Flush buffers, then repaint screen.
1284                          * Don't flush the buffers on a pipe!
1285                          */
1286                         clear_buffers();
1287                         /* FALLTHRU */
1288                 case A_REPAINT:
1289                         /*
1290                          * Repaint screen.
1291                          */
1292                         cmd_exec();
1293                         repaint();
1294                         break;
1295
1296                 case A_GOLINE:
1297                         /*
1298                          * Go to line N, default beginning of file.
1299                          */
1300                         if (number <= 0)
1301                                 number = 1;
1302                         cmd_exec();
1303                         jump_back(number);
1304                         break;
1305
1306                 case A_PERCENT:
1307                         /*
1308                          * Go to a specified percentage into the file.
1309                          */
1310                         if (number < 0)
1311                         {
1312                                 number = 0;
1313                                 fraction = 0;
1314                         }
1315                         if (number > 100)
1316                         {
1317                                 number = 100;
1318                                 fraction = 0;
1319                         }
1320                         cmd_exec();
1321                         jump_percent((int) number, fraction);
1322                         break;
1323
1324                 case A_GOEND:
1325                         /*
1326                          * Go to line N, default end of file.
1327                          */
1328                         cmd_exec();
1329                         if (number <= 0)
1330                                 jump_forw();
1331                         else
1332                                 jump_back(number);
1333                         break;
1334
1335                 case A_GOEND_BUF:
1336                         /*
1337                          * Go to line N, default last buffered byte.
1338                          */
1339                         cmd_exec();
1340                         if (number <= 0)
1341                                 jump_forw_buffered();
1342                         else
1343                                 jump_back(number);
1344                         break;
1345
1346                 case A_GOPOS:
1347                         /*
1348                          * Go to a specified byte position in the file.
1349                          */
1350                         cmd_exec();
1351                         if (number < 0)
1352                                 number = 0;
1353                         jump_line_loc((POSITION) number, jump_sline);
1354                         break;
1355
1356                 case A_STAT:
1357                         /*
1358                          * Print file name, etc.
1359                          */
1360                         if (ch_getflags() & CH_HELPFILE)
1361                                 break;
1362                         cmd_exec();
1363                         parg.p_string = eq_message();
1364                         error("%s", &parg);
1365                         break;
1366
1367                 case A_VERSION:
1368                         /*
1369                          * Print version number, without the "@(#)".
1370                          */
1371                         cmd_exec();
1372                         dispversion();
1373                         break;
1374
1375                 case A_QUIT:
1376                         /*
1377                          * Exit.
1378                          */
1379                         if (curr_ifile != NULL_IFILE &&
1380                             ch_getflags() & CH_HELPFILE)
1381                         {
1382                                 /*
1383                                  * Quit while viewing the help file
1384                                  * just means return to viewing the
1385                                  * previous file.
1386                                  */
1387                                 hshift = save_hshift;
1388                                 bs_mode = save_bs_mode;
1389                                 if (edit_prev(1) == 0)
1390                                         break;
1391                         }
1392                         if (extra != NULL)
1393                                 quit(*extra);
1394                         quit(QUIT_OK);
1395                         break;
1396
1397 /*
1398  * Define abbreviation for a commonly used sequence below.
1399  */
1400 #define DO_SEARCH() \
1401                         if (number <= 0) number = 1;    \
1402                         mca_search();                   \
1403                         cmd_exec();                     \
1404                         multi_search((char *)NULL, (int) number, 0);
1405
1406
1407                 case A_F_SEARCH:
1408                         /*
1409                          * Search forward for a pattern.
1410                          * Get the first char of the pattern.
1411                          */
1412                         search_type = SRCH_FORW;
1413                         if (number <= 0)
1414                                 number = 1;
1415                         mca_search();
1416                         c = getcc();
1417                         goto again;
1418
1419                 case A_B_SEARCH:
1420                         /*
1421                          * Search backward for a pattern.
1422                          * Get the first char of the pattern.
1423                          */
1424                         search_type = SRCH_BACK;
1425                         if (number <= 0)
1426                                 number = 1;
1427                         mca_search();
1428                         c = getcc();
1429                         goto again;
1430
1431                 case A_FILTER:
1432 #if HILITE_SEARCH
1433                         search_type = SRCH_FORW | SRCH_FILTER;
1434                         mca_search();
1435                         c = getcc();
1436                         goto again;
1437 #else
1438                         error("Command not available", NULL_PARG);
1439                         break;
1440 #endif
1441
1442                 case A_AGAIN_SEARCH:
1443                         /*
1444                          * Repeat previous search.
1445                          */
1446                         DO_SEARCH();
1447                         break;
1448
1449                 case A_T_AGAIN_SEARCH:
1450                         /*
1451                          * Repeat previous search, multiple files.
1452                          */
1453                         search_type |= SRCH_PAST_EOF;
1454                         DO_SEARCH();
1455                         break;
1456
1457                 case A_REVERSE_SEARCH:
1458                         /*
1459                          * Repeat previous search, in reverse direction.
1460                          */
1461                         save_search_type = search_type;
1462                         search_type = SRCH_REVERSE(search_type);
1463                         DO_SEARCH();
1464                         search_type = save_search_type;
1465                         break;
1466
1467                 case A_T_REVERSE_SEARCH:
1468                         /*
1469                          * Repeat previous search,
1470                          * multiple files in reverse direction.
1471                          */
1472                         save_search_type = search_type;
1473                         search_type = SRCH_REVERSE(search_type);
1474                         search_type |= SRCH_PAST_EOF;
1475                         DO_SEARCH();
1476                         search_type = save_search_type;
1477                         break;
1478
1479                 case A_UNDO_SEARCH:
1480                         undo_search();
1481                         break;
1482
1483                 case A_HELP:
1484                         /*
1485                          * Help.
1486                          */
1487                         if (ch_getflags() & CH_HELPFILE)
1488                                 break;
1489                         cmd_exec();
1490                         save_hshift = hshift;
1491                         hshift = 0;
1492                         save_bs_mode = bs_mode;
1493                         bs_mode = BS_SPECIAL;
1494                         (void) edit(FAKE_HELPFILE);
1495                         break;
1496
1497                 case A_EXAMINE:
1498 #if EXAMINE
1499                         /*
1500                          * Edit a new file.  Get the filename.
1501                          */
1502                         if (secure)
1503                         {
1504                                 error("Command not available", NULL_PARG);
1505                                 break;
1506                         }
1507                         start_mca(A_EXAMINE, "Examine: ", ml_examine, 0);
1508                         c = getcc();
1509                         goto again;
1510 #else
1511                         error("Command not available", NULL_PARG);
1512                         break;
1513 #endif
1514
1515                 case A_VISUAL:
1516                         /*
1517                          * Invoke an editor on the input file.
1518                          */
1519 #if EDITOR
1520                         if (secure)
1521                         {
1522                                 error("Command not available", NULL_PARG);
1523                                 break;
1524                         }
1525                         if (ch_getflags() & CH_HELPFILE)
1526                                 break;
1527                         if (strcmp(get_filename(curr_ifile), "-") == 0)
1528                         {
1529                                 error("Cannot edit standard input", NULL_PARG);
1530                                 break;
1531                         }
1532                         if (curr_altfilename != NULL)
1533                         {
1534                                 error("WARNING: This file was viewed via LESSOPEN",
1535                                         NULL_PARG);
1536                         }
1537                         start_mca(A_SHELL, "!", ml_shell, 0);
1538                         /*
1539                          * Expand the editor prototype string
1540                          * and pass it to the system to execute.
1541                          * (Make sure the screen is displayed so the
1542                          * expansion of "+%lm" works.)
1543                          */
1544                         make_display();
1545                         cmd_exec();
1546                         lsystem(pr_expand(editproto, 0), (char*)NULL);
1547                         break;
1548 #else
1549                         error("Command not available", NULL_PARG);
1550                         break;
1551 #endif
1552
1553                 case A_NEXT_FILE:
1554                         /*
1555                          * Examine next file.
1556                          */
1557 #if TAGS
1558                         if (ntags())
1559                         {
1560                                 error("No next file", NULL_PARG);
1561                                 break;
1562                         }
1563 #endif
1564                         if (number <= 0)
1565                                 number = 1;
1566                         if (edit_next((int) number))
1567                         {
1568                                 if (get_quit_at_eof() && eof_displayed() &&
1569                                     !(ch_getflags() & CH_HELPFILE))
1570                                         quit(QUIT_OK);
1571                                 parg.p_string = (number > 1) ? "(N-th) " : "";
1572                                 error("No %snext file", &parg);
1573                         }
1574                         break;
1575
1576                 case A_PREV_FILE:
1577                         /*
1578                          * Examine previous file.
1579                          */
1580 #if TAGS
1581                         if (ntags())
1582                         {
1583                                 error("No previous file", NULL_PARG);
1584                                 break;
1585                         }
1586 #endif
1587                         if (number <= 0)
1588                                 number = 1;
1589                         if (edit_prev((int) number))
1590                         {
1591                                 parg.p_string = (number > 1) ? "(N-th) " : "";
1592                                 error("No %sprevious file", &parg);
1593                         }
1594                         break;
1595
1596                 case A_NEXT_TAG:
1597 #if TAGS
1598                         if (number <= 0)
1599                                 number = 1;
1600                         tagfile = nexttag((int) number);
1601                         if (tagfile == NULL)
1602                         {
1603                                 error("No next tag", NULL_PARG);
1604                                 break;
1605                         }
1606                         if (edit(tagfile) == 0)
1607                         {
1608                                 POSITION pos = tagsearch();
1609                                 if (pos != NULL_POSITION)
1610                                         jump_loc(pos, jump_sline);
1611                         }
1612 #else
1613                         error("Command not available", NULL_PARG);
1614 #endif
1615                         break;
1616
1617                 case A_PREV_TAG:
1618 #if TAGS
1619                         if (number <= 0)
1620                                 number = 1;
1621                         tagfile = prevtag((int) number);
1622                         if (tagfile == NULL)
1623                         {
1624                                 error("No previous tag", NULL_PARG);
1625                                 break;
1626                         }
1627                         if (edit(tagfile) == 0)
1628                         {
1629                                 POSITION pos = tagsearch();
1630                                 if (pos != NULL_POSITION)
1631                                         jump_loc(pos, jump_sline);
1632                         }
1633 #else
1634                         error("Command not available", NULL_PARG);
1635 #endif
1636                         break;
1637
1638                 case A_INDEX_FILE:
1639                         /*
1640                          * Examine a particular file.
1641                          */
1642                         if (number <= 0)
1643                                 number = 1;
1644                         if (edit_index((int) number))
1645                                 error("No such file", NULL_PARG);
1646                         break;
1647
1648                 case A_REMOVE_FILE:
1649                         if (ch_getflags() & CH_HELPFILE)
1650                                 break;
1651                         old_ifile = curr_ifile;
1652                         new_ifile = getoff_ifile(curr_ifile);
1653                         if (new_ifile == NULL_IFILE)
1654                         {
1655                                 bell();
1656                                 break;
1657                         }
1658                         if (edit_ifile(new_ifile) != 0)
1659                         {
1660                                 reedit_ifile(old_ifile);
1661                                 break;
1662                         }
1663                         del_ifile(old_ifile);
1664                         break;
1665
1666                 case A_OPT_TOGGLE:
1667                         optflag = OPT_TOGGLE;
1668                         optgetname = FALSE;
1669                         mca_opt_toggle();
1670                         c = getcc();
1671                         goto again;
1672
1673                 case A_DISP_OPTION:
1674                         /*
1675                          * Report a flag setting.
1676                          */
1677                         optflag = OPT_NO_TOGGLE;
1678                         optgetname = FALSE;
1679                         mca_opt_toggle();
1680                         c = getcc();
1681                         goto again;
1682
1683                 case A_FIRSTCMD:
1684                         /*
1685                          * Set an initial command for new files.
1686                          */
1687                         start_mca(A_FIRSTCMD, "+", (void*)NULL, 0);
1688                         c = getcc();
1689                         goto again;
1690
1691                 case A_SHELL:
1692                         /*
1693                          * Shell escape.
1694                          */
1695 #if SHELL_ESCAPE
1696                         if (secure)
1697                         {
1698                                 error("Command not available", NULL_PARG);
1699                                 break;
1700                         }
1701                         start_mca(A_SHELL, "!", ml_shell, 0);
1702                         c = getcc();
1703                         goto again;
1704 #else
1705                         error("Command not available", NULL_PARG);
1706                         break;
1707 #endif
1708
1709                 case A_SETMARK:
1710                         /*
1711                          * Set a mark.
1712                          */
1713                         if (ch_getflags() & CH_HELPFILE)
1714                                 break;
1715                         start_mca(A_SETMARK, "mark: ", (void*)NULL, 0);
1716                         c = getcc();
1717                         if (c == erase_char || c == erase2_char ||
1718                             c == kill_char || c == '\n' || c == '\r')
1719                                 break;
1720                         setmark(c);
1721                         break;
1722
1723                 case A_GOMARK:
1724                         /*
1725                          * Go to a mark.
1726                          */
1727                         start_mca(A_GOMARK, "goto mark: ", (void*)NULL, 0);
1728                         c = getcc();
1729                         if (c == erase_char || c == erase2_char ||
1730                             c == kill_char || c == '\n' || c == '\r')
1731                                 break;
1732                         cmd_exec();
1733                         gomark(c);
1734                         break;
1735
1736                 case A_PIPE:
1737 #if PIPEC
1738                         if (secure)
1739                         {
1740                                 error("Command not available", NULL_PARG);
1741                                 break;
1742                         }
1743                         start_mca(A_PIPE, "|mark: ", (void*)NULL, 0);
1744                         c = getcc();
1745                         if (c == erase_char || c == erase2_char || c == kill_char)
1746                                 break;
1747                         if (c == '\n' || c == '\r')
1748                                 c = '.';
1749                         if (badmark(c))
1750                                 break;
1751                         pipec = c;
1752                         start_mca(A_PIPE, "!", ml_shell, 0);
1753                         c = getcc();
1754                         goto again;
1755 #else
1756                         error("Command not available", NULL_PARG);
1757                         break;
1758 #endif
1759
1760                 case A_B_BRACKET:
1761                 case A_F_BRACKET:
1762                         start_mca(action, "Brackets: ", (void*)NULL, 0);
1763                         c = getcc();
1764                         goto again;
1765
1766                 case A_LSHIFT:
1767                         if (number > 0)
1768                                 shift_count = number;
1769                         else
1770                                 number = (shift_count > 0) ?
1771                                         shift_count : sc_width / 2;
1772                         if (number > hshift)
1773                                 number = hshift;
1774                         hshift -= number;
1775                         screen_trashed = 1;
1776                         break;
1777
1778                 case A_RSHIFT:
1779                         if (number > 0)
1780                                 shift_count = number;
1781                         else
1782                                 number = (shift_count > 0) ?
1783                                         shift_count : sc_width / 2;
1784                         hshift += number;
1785                         screen_trashed = 1;
1786                         break;
1787
1788                 case A_PREFIX:
1789                         /*
1790                          * The command is incomplete (more chars are needed).
1791                          * Display the current char, so the user knows
1792                          * what's going on, and get another character.
1793                          */
1794                         if (mca != A_PREFIX)
1795                         {
1796                                 cmd_reset();
1797                                 start_mca(A_PREFIX, " ", (void*)NULL,
1798                                         CF_QUIT_ON_ERASE);
1799                                 (void) cmd_char(c);
1800                         }
1801                         c = getcc();
1802                         goto again;
1803
1804                 case A_NOACTION:
1805                         break;
1806
1807                 default:
1808                         bell();
1809                         break;
1810                 }
1811         }
1812 }