diplodocus.org Git - nmh/blob - uip/mhshowsbr.c

   1 /* mhshowsbr.c -- routines to display the contents of MIME messages
   2  *
   3  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  */
   7
   8 #include "h/mh.h"
   9 #include "sbr/concat.h"
  10 #include "sbr/trimcpy.h"
  11 #include "sbr/check_charset.h"
  12 #include "sbr/getcpy.h"
  13 #include "sbr/context_find.h"
  14 #include "sbr/pidstatus.h"
  15 #include "sbr/arglist.h"
  16 #include "sbr/error.h"
  17 #include <fcntl.h>
  18 #include "h/signals.h"
  19 #include "h/md5.h"
  20 #include "h/mts.h"
  21 #include "h/tws.h"
  22 #include "h/mime.h"
  23 #include "h/mhparse.h"
  24 #include "h/fmt_scan.h"
  25 #include "h/done.h"
  26 #include "h/utils.h"
  27 #include "mhmisc.h"
  28 #include "mhshowsbr.h"
  29 #include "sbr/m_mktemp.h"
  30 #ifdef HAVE_ICONV
  31 #   include <iconv.h>
  32 #endif /* ! HAVE_ICONV */
  33
  34 extern int debugsw;
  35
  36 int nolist   = 0;
  37
  38 char *progsw = NULL;
  39
  40 /* flags for moreproc/header display */
  41 int nomore   = 0;
  42 char *formsw = NULL;
  43
  44 /* for output markers and headers */
  45 char *folder = NULL;
  46 char *markerform;
  47 char *headerform;
  48 int headersw = -1;
  49
  50
  51 /*
  52  * static prototypes
  53  */
  54 static void show_single_message (CT, char *, int, int, int, struct format *);
  55 static void DisplayMsgHeader (CT, char *, int);
  56 static int show_switch (CT, int, int, int, int, struct format *);
  57 static int show_content (CT, int, int, int, struct format *);
  58 static int show_content_aux2 (CT, int, char *, char *, int, int, int, struct format *);
  59 static int show_text (CT, int, int, struct format *);
  60 static int show_multi (CT, int, int, int, int, struct format *);
  61 static int show_multi_internal (CT, int, int, int, int, struct format *);
  62 static int show_multi_aux (CT, int, char *, struct format *);
  63 static int show_message_rfc822 (CT, int, struct format *);
  64 static int show_partial (CT, int);
  65 static int show_external (CT, int, int, int, int, struct format *);
  66 static int parse_display_string (CT, char *, int *, int *, char *, char *,
  67                                  size_t, int multipart);
  68 static int convert_content_charset (CT, char **);
  69 static struct format *compile_header(char *);
  70 static struct format *compile_marker(char *);
  71 static void output_header (CT, struct format *);
  72 static void output_marker (CT, struct format *, int);
  73 static void free_markercomps (void);
  74 static int pidcheck(int);
  75
  76 /*
  77  * Components (and list of parameters/components) we care about for the
  78  * content marker display.
  79  */
  80
  81 static struct comp *folder_comp = NULL;
  82 static struct comp *part_comp = NULL;
  83 static struct comp *ctype_comp = NULL;
  84 static struct comp *description_comp = NULL;
  85 static struct comp *dispo_comp = NULL;
  86
  87 struct param_comp_list {
  88     char *param;
  89     struct comp *comp;
  90     struct param_comp_list *next;
  91 };
  92
  93 static struct param_comp_list *ctype_pc_list = NULL;
  94 static struct param_comp_list *dispo_pc_list = NULL;
  95
  96
  97 /*
  98  * Top level entry point to show/display a group of messages
  99  */
 100
 101 void
 102 show_all_messages(CT *cts, int concat, int textonly, int inlineonly)
 103 {
 104     CT ct, *ctp;
 105     struct format *hfmt, *mfmt;
 106
 107     /*
 108      * If form is not specified, then get default form
 109      * for showing headers of MIME messages.
 110      */
 111     if (!formsw)
 112         formsw = mh_xstrdup(etcpath("mhl.headers"));
 113
 114     /*
 115      * Compile the content marker and header format lines
 116      */
 117     mfmt = compile_marker(markerform);
 118     hfmt = compile_header(headerform);
 119
 120     /*
 121      * If form is "mhl.null", suppress display of header.
 122      */
 123     if (!strcmp (formsw, "mhl.null"))
 124         formsw = NULL;
 125
 126     for (ctp = cts; *ctp; ctp++) {
 127         ct = *ctp;
 128
 129         /* if top-level type is ok, then display message */
 130         if (type_ok (ct, 1)) {
 131             if (headersw) output_header(ct, hfmt);
 132
 133             show_single_message (ct, formsw, concat, textonly, inlineonly,
 134                                  mfmt);
 135         }
 136     }
 137
 138     free_markercomps();
 139     fmt_free(hfmt, 1);
 140     fmt_free(mfmt, 1);
 141 }
 142
 143
 144 /*
 145  * Entry point to show/display a single message
 146  */
 147
 148 static void
 149 show_single_message (CT ct, char *form, int concatsw, int textonly,
 150                      int inlineonly, struct format *fmt)
 151 {
 152     sigset_t set, oset;
 153
 154     int status = OK;
 155
 156     /* Allow user executable bit so that temporary directories created by
 157      * the viewer (e.g., lynx) are going to be accessible */
 158     umask (ct->c_umask & ~(0100));
 159
 160     /*
 161      * If you have a format file, then display
 162      * the message headers.
 163      */
 164     if (form)
 165         DisplayMsgHeader(ct, form, concatsw);
 166
 167     /* Show the body of the message */
 168     show_switch (ct, 0, concatsw, textonly, inlineonly, fmt);
 169
 170     if (ct->c_fp) {
 171         fclose (ct->c_fp);
 172         ct->c_fp = NULL;
 173     }
 174     if (ct->c_ceclosefnx)
 175         (*ct->c_ceclosefnx) (ct);
 176
 177     /* block a few signals */
 178     sigemptyset (&set);
 179     sigaddset (&set, SIGHUP);
 180     sigaddset (&set, SIGINT);
 181     sigaddset (&set, SIGQUIT);
 182     sigaddset (&set, SIGTERM);
 183     sigprocmask (SIG_BLOCK, &set, &oset);
 184
 185     while (!concatsw && wait (&status) != NOTOK) {
 186         pidcheck (status);
 187         continue;
 188     }
 189
 190     /* reset the signal mask */
 191     sigprocmask (SIG_SETMASK, &oset, &set);
 192
 193     flush_errors ();
 194 }
 195
 196
 197 /*
 198  * Use the mhlproc to show the header fields
 199  */
 200
 201 static void
 202 DisplayMsgHeader (CT ct, char *form, int concatsw)
 203 {
 204     pid_t child_id;
 205     int vecp;
 206     char **vec;
 207     char *file;
 208
 209     vec = argsplit(mhlproc, &file, &vecp);
 210     vec[vecp++] = mh_xstrdup("-form");
 211     vec[vecp++] = mh_xstrdup(form);
 212     vec[vecp++] = mh_xstrdup("-nobody");
 213     vec[vecp++] = getcpy(ct->c_file);
 214
 215     /*
 216      * If we've specified -(no)moreproc,
 217      * then just pass that along.
 218      */
 219     if (nomore || concatsw) {
 220         vec[vecp++] = mh_xstrdup("-nomoreproc");
 221     } else if (progsw) {
 222         vec[vecp++] = mh_xstrdup("-moreproc");
 223         vec[vecp++] = mh_xstrdup(progsw);
 224     }
 225     vec[vecp] = NULL;
 226
 227     fflush (stdout);
 228
 229     child_id = fork();
 230     switch (child_id) {
 231     case NOTOK:
 232         adios ("fork", "unable to");
 233         /* NOTREACHED */
 234
 235     case OK:
 236         execvp (file, vec);
 237         fprintf (stderr, "unable to exec ");
 238         perror (mhlproc);
 239         _exit(1);
 240         /* NOTREACHED */
 241
 242     default:
 243         pidcheck(pidwait(child_id, NOTOK));
 244         break;
 245     }
 246
 247     arglist_free(file, vec);
 248 }
 249
 250
 251 /*
 252  * Switching routine.  Call the correct routine
 253  * based on content type.
 254  */
 255
 256 static int
 257 show_switch (CT ct, int alternate, int concatsw, int textonly, int inlineonly,
 258              struct format *fmt)
 259 {
 260     switch (ct->c_type) {
 261         case CT_MULTIPART:
 262             return show_multi (ct, alternate, concatsw, textonly,
 263                                inlineonly, fmt);
 264
 265         case CT_MESSAGE:
 266             switch (ct->c_subtype) {
 267                 case MESSAGE_PARTIAL:
 268                     return show_partial (ct, alternate);
 269
 270                 case MESSAGE_EXTERNAL:
 271                     return show_external (ct, alternate, concatsw, textonly,
 272                                           inlineonly, fmt);
 273
 274                 case MESSAGE_RFC822:
 275                     return show_message_rfc822 (ct, alternate, fmt);
 276
 277                 /*
 278                  * Treat unknown message types as equivalent to
 279                  * application/octet-stream for now
 280                  */
 281                 default:
 282                     return show_content (ct, alternate, textonly,
 283                                          inlineonly, fmt);
 284             }
 285
 286         case CT_TEXT:
 287             return show_text (ct, alternate, concatsw, fmt);
 288
 289         case CT_AUDIO:
 290         case CT_IMAGE:
 291         case CT_VIDEO:
 292         case CT_APPLICATION:
 293         default:
 294             return show_content (ct, alternate, textonly, inlineonly, fmt);
 295     }
 296
 297     return 0;   /* NOT REACHED */
 298 }
 299
 300
 301 /*
 302  * Generic method for displaying content
 303  */
 304
 305 static int
 306 show_content (CT ct, int alternate, int textonly, int inlineonly,
 307               struct format *fmt)
 308 {
 309     char *cp;
 310     CI ci = &ct->c_ctinfo;
 311
 312     /*
 313      * If we're here, we are not a text type.  So we don't need to check
 314      * the content-type.
 315      */
 316
 317     if (textonly || (inlineonly && !is_inline(ct))) {
 318         output_marker(ct, fmt, 1);
 319         return OK;
 320     }
 321
 322     /* Check for invo_name-show-type[/subtype] */
 323     if ((cp = context_find_by_type ("show", ci->ci_type, ci->ci_subtype)))
 324         return show_content_aux (ct, alternate, cp, NULL, fmt);
 325
 326     if ((cp = ct->c_showproc))
 327         return show_content_aux (ct, alternate, cp, NULL, fmt);
 328
 329     /* complain if we are not a part of a multipart/alternative */
 330     if (!alternate)
 331         content_error (NULL, ct, "don't know how to display content");
 332
 333     return NOTOK;
 334 }
 335
 336
 337 /*
 338  * Parse the display string for displaying generic content
 339  */
 340
 341 int
 342 show_content_aux (CT ct, int alternate, char *cp, char *cracked, struct format *fmt)
 343 {
 344     int fd;
 345     int xstdin = 0, xlist = 0;
 346     char *file = NULL, buffer[NMH_BUFSIZ];
 347
 348     if (!ct->c_ceopenfnx) {
 349         if (!alternate)
 350             content_error (NULL, ct, "don't know how to decode content");
 351
 352         return NOTOK;
 353     }
 354
 355     if ((fd = (*ct->c_ceopenfnx) (ct, &file)) == NOTOK)
 356         return NOTOK;
 357     if (ct->c_showproc && !strcmp (ct->c_showproc, "true"))
 358         return OK;
 359
 360     if (! strcmp(invo_name, "mhshow")  &&
 361         ct->c_type == CT_TEXT  &&  ct->c_subtype == TEXT_PLAIN) {
 362         /* This has to be done after calling c_ceopenfnx, so
 363            unfortunately the type checks are necessary without
 364            some code rearrangement.  And to make this really ugly,
 365            only do it in mhshow, not mhfixmsg, mhn, or mhstore. */
 366         if (convert_content_charset (ct, &file) == OK) {
 367             (*ct->c_ceclosefnx) (ct);
 368             if ((fd = (*ct->c_ceopenfnx) (ct, &file)) == NOTOK)
 369                 return NOTOK;
 370         } else {
 371             char *charset = content_charset (ct);
 372             inform("unable to convert character set%s%s from %s, continuing...",
 373                       ct->c_partno  ?  " of part "  :  "",
 374                       FENDNULL(ct->c_partno),
 375                       charset);
 376             free (charset);
 377         }
 378     }
 379
 380     if (cracked) {
 381         strncpy (buffer, cp, sizeof(buffer));
 382         goto got_command;
 383     }
 384
 385     if (parse_display_string (ct, cp, &xstdin, &xlist, file, buffer,
 386                               sizeof(buffer) - 1, 0)) {
 387         inform("Buffer overflow constructing show command, continuing...");
 388         return NOTOK;
 389     }
 390
 391 got_command:
 392     return show_content_aux2 (ct, alternate, cracked, buffer,
 393                               fd, xlist, xstdin, fmt);
 394 }
 395
 396
 397 /*
 398  * Routine to actually display the content
 399  */
 400
 401 static int
 402 show_content_aux2 (CT ct, int alternate, char *cracked, char *buffer,
 403                    int fd, int xlist, int xstdin, struct format *fmt)
 404 {
 405     pid_t child_id;
 406     int vecp;
 407     char **vec, *file;
 408
 409     if (debugsw || cracked) {
 410         fflush (stdout);
 411
 412         fprintf (stderr, "%s msg %s", cracked ? "storing" : "show",
 413                  ct->c_file);
 414         if (ct->c_partno)
 415             fprintf (stderr, " part %s", ct->c_partno);
 416         if (cracked)
 417             fprintf (stderr, " using command (cd %s; %s)\n", cracked, buffer);
 418         else
 419             fprintf (stderr, " using command %s\n", buffer);
 420     }
 421
 422     if (xlist && fmt) {
 423         output_marker(ct, fmt, 0);
 424     }
 425
 426     /*
 427      * If the command is a zero-length string, just write the output on
 428      * stdout.
 429      */
 430
 431     if (buffer[0] == '\0') {
 432         char readbuf[BUFSIZ];
 433         ssize_t cc;
 434         char lastchar = '\n';
 435
 436         if (fd == NOTOK) {
 437             inform("Cannot use NULL command to display content-type "
 438                    "%s/%s", ct->c_ctinfo.ci_type, ct->c_ctinfo.ci_subtype);
 439             return NOTOK;
 440         }
 441
 442         while ((cc = read(fd, readbuf, sizeof(readbuf))) > 0) {
 443             if ((ssize_t) fwrite(readbuf, 1, cc, stdout) < cc) {
 444                 advise ("putline", "fwrite");
 445             }
 446             lastchar = readbuf[cc - 1];
 447         }
 448
 449         if (cc < 0) {
 450             advise("read", "while reading text content");
 451             return NOTOK;
 452         }
 453
 454         /*
 455          * The MIME standards allow content to not have a trailing newline.
 456          * But because we are (presumably) sending this to stdout, include
 457          * a newline for text content if the final character was not a
 458          * newline.  Only do this for mhshow.
 459          */
 460
 461         if (strcmp(invo_name, "mhshow") == 0 && ct->c_type == CT_TEXT &&
 462             ct->c_subtype == TEXT_PLAIN && lastchar != '\n') {
 463             putchar('\n');
 464         }
 465
 466         fflush(stdout);
 467
 468         return OK;
 469     }
 470
 471     vec = argsplit(buffer, &file, &vecp);
 472     vec[vecp++] = NULL;
 473
 474     fflush (stdout);
 475
 476     child_id = fork();
 477     switch (child_id) {
 478         case NOTOK:
 479             advise ("fork", "unable to");
 480             (*ct->c_ceclosefnx) (ct);
 481             return NOTOK;
 482
 483         case OK:
 484             if (cracked) {
 485                 if (chdir (cracked) < 0) {
 486                     advise (cracked, "chdir");
 487                 }
 488             }
 489             if (!xstdin)
 490                 dup2 (fd, 0);
 491             close (fd);
 492             execvp (file, vec);
 493             fprintf (stderr, "unable to exec ");
 494             perror (buffer);
 495             _exit(1);
 496             /* NOTREACHED */
 497
 498         default: {
 499             int status;
 500             char *display_prog = vecp > 2  &&  vec[2][0] != '\0'
 501                 /* Copy the real display program name.  This relies on the
 502                    specific construction of vec[] by argsplit(). */
 503                 ?  vec[2]
 504                 :  NULL;
 505
 506             pidcheck ((status = pidXwait (child_id, display_prog)));
 507
 508             arglist_free(file, vec);
 509             if (fd != NOTOK)
 510                 (*ct->c_ceclosefnx) (ct);
 511             return alternate ? OK : status;
 512         }
 513     }
 514 }
 515
 516
 517 /*
 518  * show content of type "text"
 519  */
 520
 521 static int
 522 show_text (CT ct, int alternate, int concatsw, struct format *fmt)
 523 {
 524     char *cp, buffer[BUFSIZ];
 525     CI ci = &ct->c_ctinfo;
 526
 527     /* Check for invo_name-show-type[/subtype] */
 528     if ((cp = context_find_by_type ("show", ci->ci_type, ci->ci_subtype)))
 529         return show_content_aux (ct, alternate, cp, NULL, fmt);
 530
 531     /*
 532      * Use default method if content is text/plain, or if
 533      * if it is not a text part of a multipart/alternative
 534      */
 535     if (!alternate || ct->c_subtype == TEXT_PLAIN) {
 536         if (concatsw) {
 537             if (ct->c_termproc)
 538                 snprintf(buffer, sizeof(buffer), "%%lcat");
 539             else
 540                 snprintf(buffer, sizeof(buffer), "%%l");
 541         } else
 542             snprintf (buffer, sizeof(buffer), "%%l%s %%F", progsw ? progsw :
 543                       moreproc && *moreproc ? moreproc : DEFAULT_PAGER);
 544         cp = (ct->c_showproc = mh_xstrdup(buffer));
 545         return show_content_aux (ct, alternate, cp, NULL, fmt);
 546     }
 547
 548     return NOTOK;
 549 }
 550
 551
 552 /*
 553  * show message body of type "multipart"
 554  */
 555
 556 static int
 557 show_multi (CT ct, int alternate, int concatsw, int textonly, int inlineonly,
 558             struct format *fmt)
 559 {
 560     char *cp;
 561     CI ci = &ct->c_ctinfo;
 562
 563     /* Check for invo_name-show-type[/subtype] */
 564     if ((cp = context_find_by_type ("show", ci->ci_type, ci->ci_subtype)))
 565         return show_multi_aux (ct, alternate, cp, fmt);
 566
 567     if ((cp = ct->c_showproc)) {
 568         return show_multi_aux (ct, alternate, cp, fmt);
 569     }
 570
 571     /*
 572      * Use default method to display this multipart content.  Even
 573      * unknown types are displayable, since they're treated as mixed
 574      * per RFC 2046.
 575      */
 576     return show_multi_internal (ct, alternate, concatsw, textonly,
 577                                 inlineonly, fmt);
 578 }
 579
 580
 581 /*
 582  * show message body of subtypes of multipart that
 583  * we understand directly (mixed, alternate, etc...)
 584  */
 585
 586 static int
 587 show_multi_internal (CT ct, int alternate, int concatsw, int textonly,
 588                      int inlineonly, struct format *fmt)
 589 {
 590     int alternating, nowalternate, result;
 591     struct multipart *m = (struct multipart *) ct->c_ctparams;
 592     struct part *part;
 593     bool request_matched;
 594     bool display_success;
 595     bool mult_alt_done;
 596     int ret;
 597     CT p;
 598
 599     alternating = 0;
 600     nowalternate = alternate;
 601
 602     if (ct->c_subtype == MULTI_ALTERNATE) {
 603         nowalternate = 1;
 604         alternating  = 1;
 605     }
 606
 607     /*
 608      * alternate   -> we are a part inside a multipart/alternative
 609      * alternating -> we are a multipart/alternative
 610      */
 611
 612     result = NOTOK;
 613     request_matched = false;
 614     display_success = false;
 615     mult_alt_done = false;
 616
 617     for (part = m->mp_parts; part; part = part->mp_next) {
 618         p = part->mp_part;
 619
 620         /* while looking for the right displayable alternative, we
 621          * use a looser search criterion than we do after finding it.
 622          * specifically, while still looking, part_ok() will match
 623          * "parent" parts (e.g.  "-part 2" where 2 is a high-level
 624          * multipart).  after finding it, we use part_exact() to only
 625          * choose a part that was requested explicitly.
 626          */
 627         if ((part_exact(p) && type_ok(p, 1)) ||
 628                 (!mult_alt_done && part_ok (p) && type_ok (p, 1))) {
 629
 630             int inneresult;
 631
 632             inneresult = show_switch (p, nowalternate, concatsw, textonly,
 633                                       inlineonly, fmt);
 634             switch (inneresult) {
 635                 case NOTOK:  /* hard display error */
 636                     request_matched = true;
 637                     if (alternate && !alternating) {
 638                         result = NOTOK;
 639                         goto out;
 640                     }
 641                     continue;
 642
 643                 case DONE:  /* found no match on content type */
 644                     continue;
 645
 646                 case OK:  /* display successful */
 647                     request_matched = true;
 648                     display_success = true;
 649                     result = OK;
 650
 651                     /* if we got success on a sub-part of
 652                      * multipart/alternative, we're done, unless
 653                      * there's a chance an explicit part should be
 654                      * matched later in the alternatives.  */
 655                     if (alternating) {
 656                         mult_alt_done = true;
 657                     } else if (alternate) {
 658                         alternate = nowalternate = 0;
 659                     }
 660                     continue;
 661             }
 662             break;
 663         }
 664     }
 665
 666     /* we're supposed to be displaying at least something from a
 667      * multipart/alternative.  if we've had parts to consider, and
 668      * we've had no success, then we should complain.  we shouldn't
 669      * complain if none of the parts matched any -part or -type option.
 670      */
 671     if (alternating && request_matched && !display_success) {
 672         /* if we're ourselves an alternate.  don't complain yet. */
 673         if (!alternate)
 674             content_error (NULL, ct, "don't know how to display any of the contents");
 675         result = NOTOK;
 676     }
 677
 678 out:
 679     /* if no parts matched what was requested, there can't have been
 680      * any display errors.  we report DONE rather than OK. */
 681     ret = request_matched ? result : DONE;
 682     return ret;
 683 }
 684
 685
 686 /*
 687  * Parse display string for multipart content
 688  * and use external program to display it.
 689  */
 690
 691 static int
 692 show_multi_aux (CT ct, int alternate, char *cp, struct format *fmt)
 693 {
 694     /* xstdin is only used in the call to parse_display_string():
 695        its value is ignored in the function. */
 696     int xstdin = 0, xlist = 0;
 697     char *file = NULL, buffer[BUFSIZ];
 698     struct multipart *m = (struct multipart *) ct->c_ctparams;
 699     struct part *part;
 700     CT p;
 701
 702     for (part = m->mp_parts; part; part = part->mp_next) {
 703         p = part->mp_part;
 704
 705         if (!p->c_ceopenfnx) {
 706             if (!alternate)
 707                 content_error (NULL, p, "don't know how to decode content");
 708             return NOTOK;
 709         }
 710
 711         if (p->c_storage == NULL) {
 712             if ((*p->c_ceopenfnx) (p, &file) == NOTOK)
 713                 return NOTOK;
 714
 715             p->c_storage = mh_xstrdup(FENDNULL(file));
 716
 717             if (p->c_showproc && !strcmp (p->c_showproc, "true"))
 718                 return OK;
 719             (*p->c_ceclosefnx) (p);
 720         }
 721     }
 722
 723     if (parse_display_string (ct, cp, &xstdin, &xlist, file,
 724                               buffer, sizeof(buffer) - 1, 1)) {
 725         inform("Buffer overflow constructing show command, continuing...");
 726         return NOTOK;
 727     }
 728
 729     return show_content_aux2 (ct, alternate, NULL, buffer, NOTOK, xlist, 0, fmt);
 730 }
 731
 732
 733 /*
 734  * show content of type "message/rfc822"
 735  */
 736
 737 static int
 738 show_message_rfc822 (CT ct, int alternate, struct format *fmt)
 739 {
 740     char *cp;
 741     CI ci = &ct->c_ctinfo;
 742
 743     /* Check for invo_name-show-type[/subtype] */
 744     if ((cp = context_find_by_type ("show", ci->ci_type, ci->ci_subtype)))
 745         return show_content_aux (ct, alternate, cp, NULL, fmt);
 746
 747     if ((cp = ct->c_showproc))
 748         return show_content_aux (ct, alternate, cp, NULL, fmt);
 749
 750     /* default method for message/rfc822 */
 751     if (ct->c_subtype == MESSAGE_RFC822) {
 752         cp = (ct->c_showproc = mh_xstrdup("%pshow -file %F"));
 753         return show_content_aux (ct, alternate, cp, NULL, fmt);
 754     }
 755
 756     /* complain if we are not a part of a multipart/alternative */
 757     if (!alternate)
 758         content_error (NULL, ct, "don't know how to display content");
 759
 760     return NOTOK;
 761 }
 762
 763
 764 /*
 765  * Show content of type "message/partial".
 766  */
 767
 768 static int
 769 show_partial (CT ct, int alternate)
 770 {
 771     NMH_UNUSED (alternate);
 772
 773     content_error (NULL, ct,
 774         "in order to display this message, you must reassemble it");
 775     return NOTOK;
 776 }
 777
 778
 779 /*
 780  * Show content of type "message/external".
 781  *
 782  * THE ERROR CHECKING IN THIS ONE IS NOT DONE YET.
 783  */
 784
 785 static int
 786 show_external (CT ct, int alternate, int concatsw, int textonly, int inlineonly,
 787                struct format *fmt)
 788 {
 789     struct exbody *e = (struct exbody *) ct->c_ctparams;
 790     CT p = e->eb_content;
 791
 792     if (!type_ok (p, 0))
 793         return OK;
 794
 795     return show_switch (p, alternate, concatsw, textonly, inlineonly, fmt);
 796 }
 797
 798
 799 static int
 800 parse_display_string (CT ct, char *cp, int *xstdin, int *xlist,
 801                       char *file, char *buffer, size_t buflen,
 802                       int multipart)
 803 {
 804     int len;
 805     bool quoted = false;
 806     char *bp = buffer, *pp;
 807     CI ci = &ct->c_ctinfo;
 808
 809     bp[0] = bp[buflen] = '\0';
 810
 811     for ( ; *cp && buflen > 0; cp++) {
 812         if (*cp == '%') {
 813             pp = bp;
 814
 815             switch (*++cp) {
 816             case 'a':
 817                 /* insert parameters from Content-Type field */
 818             {
 819                 PM pm;
 820                 char *s = "";
 821
 822                 for (pm = ci->ci_first_pm; pm; pm = pm->pm_next) {
 823                     snprintf (bp, buflen, "%s%s=\"%s\"", s, pm->pm_name,
 824                               get_param_value(pm, '?'));
 825                     len = strlen (bp);
 826                     bp += len;
 827                     buflen -= len;
 828                     s = " ";
 829                 }
 830             }
 831             break;
 832
 833             case 'd':
 834                 /* insert content description */
 835                 if (ct->c_descr) {
 836                     char *s;
 837
 838                     s = trimcpy (ct->c_descr);
 839                     strncpy (bp, s, buflen);
 840                     free (s);
 841                 }
 842                 break;
 843
 844             case 'e':
 845                 /* no longer implemented */
 846                 break;
 847
 848             case 'F':
 849                 /* %f, and stdin is terminal not content */
 850                 *xstdin = 1;
 851                 /* FALLTHRU */
 852
 853             case 'f':
 854                 if (multipart) {
 855                     /* insert filename(s) containing content */
 856                     struct multipart *m = (struct multipart *) ct->c_ctparams;
 857                     struct part *part;
 858                     char *s = "";
 859                     CT p;
 860
 861                     for (part = m->mp_parts; part; part = part->mp_next) {
 862                         p = part->mp_part;
 863
 864                         snprintf (bp, buflen, "%s%s", s, p->c_storage);
 865                         len = strlen (bp);
 866                         bp += len;
 867                         buflen -= len;
 868                         s = " ";
 869                     }
 870                 } else {
 871                     /* insert filename containing content */
 872                     snprintf (bp, buflen, "%s", file);
 873
 874                     /*
 875                      * Old comments below are left here for posterity.
 876                      * This was/is tricky.
 877                      */
 878                     /* since we've quoted the file argument, set things up
 879                      * to look past it, to avoid problems with the quoting
 880                      * logic below.  (I know, I should figure out what's
 881                      * broken with the quoting logic, but..)
 882                      */
 883                     /*
 884                      * Here's the email that submitted the patch with
 885                      * the comment above:
 886                      *   https://www.mail-archive.com/nmh-workers@mhost.com/
 887                      *     msg00288.html
 888                      * I can't tell from that exactly what was broken,
 889                      * beyond misquoting of the filename.  The profile
 890                      * had appearances of %F both with and without quotes.
 891                      * The unquoted ones should have been quoted by the
 892                      * code below.
 893                      * The fix was to always quote the filename.  But
 894                      * that broke '%F' because it expanded to ''filename''.
 895                      */
 896                     /*
 897                      * Old comments above are left here for posterity.
 898                      * The quoting below should work properly now.
 899                      */
 900                 }
 901                 break;
 902
 903             case 'p':
 904                 /* No longer supported */
 905                 /* FALLTHRU */
 906
 907             case 'l':
 908                 /* display listing prior to displaying content */
 909                 *xlist = !nolist;
 910                 break;
 911
 912             case 's':
 913                 /* insert subtype of content */
 914                 strncpy (bp, ci->ci_subtype, buflen);
 915                 break;
 916
 917             case '%':
 918                 /* insert character % */
 919                 goto raw;
 920
 921             case '{' : {
 922                 const char *closing_brace = strchr(cp, '}');
 923
 924                 if (closing_brace) {
 925                     const size_t param_len = closing_brace - cp - 1;
 926                     char *param = mh_xmalloc(param_len + 1);
 927                     char *value;
 928
 929                     (void) strncpy(param, cp + 1, param_len);
 930                     param[param_len] = '\0';
 931                     value = get_param(ci->ci_first_pm, param, '?', 0);
 932                     free(param);
 933
 934                     cp += param_len + 1; /* Skip both braces, too. */
 935
 936                     if (value) {
 937                         /* %{param} is set in the Content-Type header.
 938                            After the break below, quote it if necessary. */
 939                         (void) strncpy(bp, value, buflen);
 940                         free(value);
 941                     } else {
 942                         /* %{param} not found, so skip it completely.  cp
 943                            was advanced above. */
 944                         continue;
 945                     }
 946                 } else {
 947                     /* This will get confused if there are multiple %{}'s,
 948                        but its real purpose is to avoid doing bad things
 949                        above if a closing brace wasn't found. */
 950                     inform("no closing brace for display string escape %s, continuing...",
 951                              cp);
 952                 }
 953                 break;
 954             }
 955
 956             default:
 957                 *bp++ = *--cp;
 958                 *bp = '\0';
 959                 buflen--;
 960                 continue;
 961             }
 962             len = strlen (bp);
 963             bp += len;
 964             buflen -= len;
 965             *bp = '\0';
 966
 967             /* Did we actually insert something? */
 968             if (bp != pp) {
 969                 /* Insert single quote if not inside quotes already */
 970                 if (!quoted && buflen) {
 971                     len = strlen (pp);
 972                     memmove (pp + 1, pp, len+1);
 973                     *pp++ = '\'';
 974                     buflen--;
 975                     bp++;
 976                     quoted = true;
 977                 }
 978                 /* Escape existing quotes */
 979                 while ((pp = strchr (pp, '\'')) && buflen > 3) {
 980                     len = strlen (pp++);
 981                     if (quoted) {
 982                         /* Quoted.  Let this quote close that quoting.
 983                            Insert an escaped quote to replace it and
 984                            another quote to reopen quoting, which will be
 985                            closed below. */
 986                         memmove (pp + 2, pp, len);
 987                         *pp++ = '\\';
 988                         *pp++ = '\'';
 989                         buflen -= 2;
 990                         bp += 2;
 991                         quoted = false;
 992                     } else {
 993                         /* Not quoted.  This should not be reached with
 994                            the current code, but handle the condition
 995                            in case the code changes.  Just escape the
 996                            quote. */
 997                         memmove (pp, pp-1, len+1);
 998                         *(pp++-1) = '\\';
 999                         buflen--;
1000                         bp++;
1001                     }
1002                 }
1003                 /* If pp is still set, that means we ran out of space. */
1004                 if (pp)
1005                     buflen = 0;
1006                 /* Close quoting. */
1007                 if (quoted && buflen) {
1008                     /* See if we need to close the quote by looking
1009                        for an odd number of unescaped close quotes in
1010                        the remainder of the display string. */
1011                     int found_quote = 0, escaped = 0;
1012                     char *c;
1013
1014                     for (c = cp+1; *c; ++c) {
1015                         if (*c == '\\') {
1016                             escaped = ! escaped;
1017                         } else {
1018                             if (escaped) {
1019                                 escaped = 0;
1020                             } else {
1021                                 if (*c == '\'') {
1022                                     found_quote = ! found_quote;
1023                                 }
1024                             }
1025                         }
1026                     }
1027                     if (! found_quote) {
1028                         *bp++ = '\'';
1029                         buflen--;
1030                         quoted = false;
1031                     }
1032                 }
1033             }
1034         } else {
1035 raw:
1036             *bp++ = *cp;
1037             buflen--;
1038
1039             if (*cp == '\'')
1040                 quoted = !quoted;
1041         }
1042
1043         *bp = '\0';
1044     }
1045
1046     if (buflen <= 0 ||
1047         (ct->c_termproc && buflen <= strlen(ct->c_termproc))) {
1048         /* content_error would provide a more useful error message
1049          * here, except that if we got overrun, it probably would
1050          * too.
1051          */
1052         return NOTOK;
1053     }
1054
1055     /* use charset string to modify display method */
1056     if (ct->c_termproc) {
1057         char term[BUFSIZ];
1058
1059         strncpy (term, buffer, sizeof(term));
1060         snprintf (buffer, buflen, ct->c_termproc, term);
1061     }
1062
1063     return OK;
1064 }
1065
1066
1067 int
1068 convert_charset (CT ct, char *dest_charset, int *message_mods)
1069 {
1070     char *src_charset = content_charset (ct);
1071     int status = OK;
1072
1073     if (strcasecmp (src_charset, dest_charset)) {
1074 #ifdef HAVE_ICONV
1075         iconv_t conv_desc = NULL;
1076         char *dest;
1077         int fd = -1;
1078         char **file = NULL;
1079         FILE **fp = NULL;
1080         size_t begin;
1081         size_t end;
1082         bool opened_input_file = false;
1083         char src_buffer[BUFSIZ];
1084         size_t dest_buffer_size = BUFSIZ;
1085         char *dest_buffer = mh_xmalloc(dest_buffer_size);
1086         HF hf;
1087         char *tempfile;
1088         int fromutf8 = !strcasecmp(src_charset, "UTF-8");
1089
1090         if ((conv_desc = iconv_open (dest_charset, src_charset)) ==
1091             (iconv_t) -1) {
1092             inform("Can't convert %s to %s", src_charset, dest_charset);
1093             free (src_charset);
1094             return NOTOK;
1095         }
1096
1097         if ((tempfile = m_mktemp2 (NULL, invo_name, &fd, NULL)) == NULL) {
1098             die("unable to create temporary file in %s",
1099                    get_temp_dir());
1100         }
1101         dest = mh_xstrdup(tempfile);
1102
1103         if (ct->c_cefile.ce_file) {
1104             file = &ct->c_cefile.ce_file;
1105             fp = &ct->c_cefile.ce_fp;
1106             begin = end = 0;
1107         } else if (ct->c_file) {
1108             file = &ct->c_file;
1109             fp = &ct->c_fp;
1110             begin = (size_t) ct->c_begin;
1111             end = (size_t) ct->c_end;
1112         } /* else no input file: shouldn't happen */
1113
1114         if (file  &&  *file  &&  fp) {
1115             if (! *fp) {
1116                 if ((*fp = fopen (*file, "r")) == NULL) {
1117                     advise (*file, "unable to open for reading");
1118                     status = NOTOK;
1119                 } else {
1120                     opened_input_file = true;
1121                 }
1122             }
1123         }
1124
1125         if (fp  &&  *fp) {
1126             size_t inbytes;
1127             size_t bytes_to_read =
1128                 end > 0 && end > begin  ?  end - begin  :  sizeof src_buffer;
1129
1130             fseeko (*fp, begin, SEEK_SET);
1131             while ((inbytes = fread (src_buffer, 1,
1132                                      min (bytes_to_read, sizeof src_buffer),
1133                                      *fp)) > 0) {
1134                 ICONV_CONST char *ib = src_buffer;
1135                 char *ob = dest_buffer;
1136                 size_t outbytes = dest_buffer_size;
1137                 size_t outbytes_before = outbytes;
1138
1139                 if (end > 0) bytes_to_read -= inbytes;
1140
1141 iconv_start:
1142                 if (iconv (conv_desc, &ib, &inbytes, &ob, &outbytes) ==
1143                     (size_t) -1) {
1144                     if (errno == E2BIG) {
1145                         /*
1146                          * Bump up the buffer by at least a factor of 2
1147                          * over what we need.
1148                          */
1149                         size_t bumpup = inbytes * 2, ob_off = ob - dest_buffer;
1150                         dest_buffer_size += bumpup;
1151                         dest_buffer = mh_xrealloc(dest_buffer,
1152                                                   dest_buffer_size);
1153                         ob = dest_buffer + ob_off;
1154                         outbytes += bumpup;
1155                         outbytes_before += bumpup;
1156                         goto iconv_start;
1157                     }
1158                     if (errno == EINVAL) {
1159                         /* middle of multi-byte sequence */
1160                         if (write (fd, dest_buffer, outbytes_before - outbytes) < 0) {
1161                             advise (dest, "write");
1162                         }
1163                         fseeko (*fp, -inbytes, SEEK_CUR);
1164                         if (end > 0) bytes_to_read += inbytes;
1165                         /* inform("convert_charset: EINVAL"); */
1166                         continue;
1167                     }
1168                     if (errno == EILSEQ) {
1169                         /* invalid multi-byte sequence */
1170                         if (fromutf8) {
1171                             for (++ib, --inbytes;
1172                                  inbytes > 0 &&
1173                                         (((unsigned char) *ib) & 0xc0) == 0x80;
1174                                  ++ib, --inbytes)
1175                                 continue;
1176                         } else {
1177                             ib++; inbytes--; /* skip it */
1178                         }
1179                         (*ob++) = '?'; outbytes --;
1180                         /* inform("convert_charset: EILSEQ"); */
1181                         goto iconv_start;
1182                     }
1183                     inform("convert_charset: errno = %d", errno);
1184                     status = NOTOK;
1185                     break;
1186                 }
1187
1188                 if (write (fd, dest_buffer, outbytes_before - outbytes) < 0) {
1189                     advise (dest, "write");
1190                 }
1191             }
1192
1193             if (opened_input_file) {
1194                 fclose (*fp);
1195                 *fp = NULL;
1196             }
1197         }
1198
1199         iconv_close (conv_desc);
1200         close (fd);
1201
1202         if (status == OK) {
1203             /* Replace the decoded file with the converted one. */
1204             if (ct->c_cefile.ce_file) {
1205                 if (ct->c_cefile.ce_unlink) {
1206                     (void) m_unlink (ct->c_cefile.ce_file);
1207                 }
1208                 free (ct->c_cefile.ce_file);
1209             }
1210             ct->c_cefile.ce_file = dest;
1211             ct->c_cefile.ce_unlink = 1;
1212
1213             ++*message_mods;
1214
1215             /* Update ct->c_ctline. */
1216             if (ct->c_ctline) {
1217                 char *ctline = concat(" ", ct->c_ctinfo.ci_type, "/",
1218                                       ct->c_ctinfo.ci_subtype, NULL);
1219                 char *outline;
1220
1221                 replace_param(&ct->c_ctinfo.ci_first_pm,
1222                               &ct->c_ctinfo.ci_last_pm, "charset",
1223                               dest_charset, 0);
1224                 outline = output_params(LEN(TYPE_FIELD) + 1 + strlen(ctline),
1225                                         ct->c_ctinfo.ci_first_pm, NULL, 0);
1226                 if (outline) {
1227                     ctline = add(outline, ctline);
1228                     free(outline);
1229                 }
1230
1231                 free (ct->c_ctline);
1232                 ct->c_ctline = ctline;
1233             } /* else no CT line, which is odd */
1234
1235             /* Update Content-Type header field. */
1236             for (hf = ct->c_first_hf; hf; hf = hf->next) {
1237                 if (! strcasecmp (TYPE_FIELD, hf->name)) {
1238                     char *ctline = concat (ct->c_ctline, "\n", NULL);
1239
1240                     free (hf->value);
1241                     hf->value = ctline;
1242                     break;
1243                 }
1244             }
1245         } else {
1246             (void) m_unlink (dest);
1247         }
1248         free(dest_buffer);
1249 #else  /* ! HAVE_ICONV */
1250         NMH_UNUSED (message_mods);
1251
1252         inform("Can't convert %s to %s without iconv", src_charset,
1253                 dest_charset);
1254         errno = ENOSYS;
1255         status = NOTOK;
1256 #endif /* ! HAVE_ICONV */
1257     }
1258
1259     free (src_charset);
1260     return status;
1261 }
1262
1263
1264 static int
1265 convert_content_charset (CT ct, char **file)
1266 {
1267     int status = OK;
1268
1269 #ifdef HAVE_ICONV
1270     /* Using current locale, see if the content needs to be converted. */
1271
1272     /* content_charset() cannot return NULL. */
1273     char *src_charset = content_charset (ct);
1274
1275     if (! check_charset (src_charset, strlen (src_charset))) {
1276         int unused = 0;
1277
1278         char *dest_charset = getcpy (get_charset ());
1279
1280         if (convert_charset (ct, dest_charset, &unused) == 0) {
1281             *file = ct->c_cefile.ce_file;
1282         } else {
1283             status = NOTOK;
1284         }
1285
1286         free (dest_charset);
1287     }
1288     free (src_charset);
1289 #else  /* ! HAVE_ICONV */
1290     NMH_UNUSED (ct);
1291     NMH_UNUSED (file);
1292 #endif /* ! HAVE_ICONV */
1293
1294     return status;
1295 }
1296
1297 /*
1298  * Compile our format string and save any parameters we care about.
1299  */
1300
1301 #define DEFAULT_HEADER "[ Message %{folder}%<{folder}:%>%(msg) ]"
1302 #define DEFAULT_MARKER "[ part %{part} - %{content-type} - " \
1303                        "%<{description}%{description}" \
1304                          "%?{cdispo-filename}%{cdispo-filename}" \
1305                          "%|%{ctype-name}%>  " \
1306                        "%(kilo(size))B %<(unseen)\\(suppressed\\)%> ]"
1307
1308 static struct format *
1309 compile_header(char *form)
1310 {
1311     struct format *fmt;
1312     char *fmtstring;
1313     struct comp *comp = NULL;
1314     unsigned int bucket;
1315
1316     fmtstring = new_fs(form, NULL, DEFAULT_HEADER);
1317
1318     (void) fmt_compile(fmtstring, &fmt, 1);
1319     free_fs();
1320
1321     while ((comp = fmt_nextcomp(comp, &bucket)) != NULL) {
1322         if (strcasecmp(comp->c_name, "folder") == 0) {
1323             folder_comp = comp;
1324         }
1325     }
1326
1327     return fmt;
1328 }
1329
1330 static struct format *
1331 compile_marker(char *form)
1332 {
1333     struct format *fmt;
1334     char *fmtstring;
1335     struct comp *comp = NULL;
1336     unsigned int bucket;
1337     struct param_comp_list *pc_entry;
1338
1339     fmtstring = new_fs(form, NULL, DEFAULT_MARKER);
1340
1341     (void) fmt_compile(fmtstring, &fmt, 1);
1342     free_fs();
1343
1344     /*
1345      * Things we care about:
1346      *
1347      * part             - Part name (e.g., 1.1)
1348      * content-type     - Content-Type
1349      * description      - Content-Description
1350      * disposition      - Content-Disposition (inline, attachment)
1351      * ctype-<param>    - Content-Type parameter
1352      * cdispo-<param>   - Content-Disposition parameter
1353      */
1354
1355     while ((comp = fmt_nextcomp(comp, &bucket)) != NULL) {
1356         if (strcasecmp(comp->c_name, "part") == 0) {
1357             part_comp = comp;
1358         } else if (strcasecmp(comp->c_name, "content-type") == 0) {
1359             ctype_comp = comp;
1360         } else if (strcasecmp(comp->c_name, "description") == 0) {
1361             description_comp = comp;
1362         } else if (strcasecmp(comp->c_name, "disposition") == 0) {
1363             dispo_comp = comp;
1364         } else if (strncasecmp(comp->c_name, "ctype-", 6) == 0 &&
1365                    strlen(comp->c_name) > 6) {
1366             NEW(pc_entry);
1367             pc_entry->param = mh_xstrdup(comp->c_name + 6);
1368             pc_entry->comp = comp;
1369             pc_entry->next = ctype_pc_list;
1370             ctype_pc_list = pc_entry;
1371         } else if (strncasecmp(comp->c_name, "cdispo-", 7) == 0 &&
1372                    strlen(comp->c_name) > 7) {
1373             NEW(pc_entry);
1374             pc_entry->param = mh_xstrdup(comp->c_name + 7);
1375             pc_entry->comp = comp;
1376             pc_entry->next = dispo_pc_list;
1377             dispo_pc_list = pc_entry;
1378         }
1379     }
1380
1381     return fmt;
1382 }
1383
1384 /*
1385  * Output on stdout an appropriate marker for this content, using mh-format
1386  */
1387
1388 static void
1389 output_header(CT ct, struct format *fmt)
1390 {
1391     charstring_t outbuf = charstring_create (BUFSIZ);
1392     int dat[5] = { 0 };
1393     char *endp;
1394     int message = 0;
1395
1396     if (folder_comp)
1397         folder_comp->c_text = getcpy(folder);
1398
1399     if (ct->c_file && *ct->c_file) {
1400         message = strtol(ct->c_file, &endp, 10);
1401         if (*endp) message = 0;
1402         dat[0] = message;
1403     }
1404
1405     /* it would be nice to populate dat[2], for %(size) here,
1406      * but it's not available.  it might also be nice to know
1407      * if the message originally had any mime parts or not -- but
1408      * there's also no record of that.  (except for MIME-version:)
1409      */
1410
1411     fmt_scan(fmt, outbuf, BUFSIZ, dat, NULL);
1412
1413     fputs(charstring_buffer (outbuf), stdout);
1414     charstring_free (outbuf);
1415
1416     fmt_freecomptext();
1417 }
1418
1419 static void
1420 output_marker(CT ct, struct format *fmt, int hidden)
1421 {
1422     charstring_t outbuf = charstring_create (BUFSIZ);
1423     struct param_comp_list *pcentry;
1424     int partsize;
1425     int message = 0;
1426     char *endp;
1427     int dat[5] = { 0 };
1428
1429     /*
1430      * Grab any items we care about.
1431      */
1432
1433     if (ctype_comp && ct->c_ctinfo.ci_type) {
1434         ctype_comp->c_text = concat(ct->c_ctinfo.ci_type, "/",
1435                                     ct->c_ctinfo.ci_subtype, NULL);
1436     }
1437
1438     if (part_comp && ct->c_partno) {
1439         part_comp->c_text = mh_xstrdup(ct->c_partno);
1440     }
1441
1442     if (description_comp && ct->c_descr) {
1443         description_comp->c_text = mh_xstrdup(ct->c_descr);
1444     }
1445
1446     if (dispo_comp && ct->c_dispo_type) {
1447         dispo_comp->c_text = mh_xstrdup(ct->c_dispo_type);
1448     }
1449
1450     for (pcentry = ctype_pc_list; pcentry != NULL; pcentry = pcentry->next) {
1451         pcentry->comp->c_text = get_param(ct->c_ctinfo.ci_first_pm,
1452                                           pcentry->param, '?', 0);
1453     }
1454
1455     for (pcentry = dispo_pc_list; pcentry != NULL; pcentry = pcentry->next) {
1456         pcentry->comp->c_text = get_param(ct->c_dispo_first,
1457                                           pcentry->param, '?', 0);
1458     }
1459
1460     if (ct->c_cesizefnx)
1461         partsize = (*ct->c_cesizefnx) (ct);
1462     else
1463         partsize = ct->c_end - ct->c_begin;
1464
1465     if (ct->c_file && *ct->c_file) {
1466         message = strtol(ct->c_file, &endp, 10);
1467         if (*endp) message = 0;
1468         dat[0] = message;
1469     }
1470     dat[2] = partsize;
1471
1472     /* make the part's hidden aspect available by overloading the
1473      * %(unseen) function.  make the part's size available via %(size).
1474      * see comments in h/fmt_scan.h.
1475      */
1476     dat[4] = hidden;
1477
1478     fmt_scan(fmt, outbuf, BUFSIZ, dat, NULL);
1479
1480     fputs(charstring_buffer (outbuf), stdout);
1481     charstring_free (outbuf);
1482
1483     fmt_freecomptext();
1484 }
1485
1486 /*
1487  * Reset (and free) any of the saved marker text
1488  */
1489
1490 static void
1491 free_markercomps(void)
1492 {
1493     struct param_comp_list *pc_entry, *pc2;
1494
1495     folder_comp = NULL;
1496     part_comp = NULL;
1497     ctype_comp = NULL;
1498     description_comp = NULL;
1499     dispo_comp = NULL;
1500
1501     for (pc_entry = ctype_pc_list; pc_entry != NULL; ) {
1502         free(pc_entry->param);
1503         pc2 = pc_entry->next;
1504         free(pc_entry);
1505         pc_entry = pc2;
1506     }
1507
1508     for (pc_entry = dispo_pc_list; pc_entry != NULL; ) {
1509         free(pc_entry->param);
1510         pc2 = pc_entry->next;
1511         free(pc_entry);
1512         pc_entry = pc2;
1513     }
1514 }
1515
1516 /*
1517  * Exit if the display process returned with a nonzero exit code, or terminated
1518  * with a SIGQUIT signal.
1519  */
1520
1521 static int
1522 pidcheck (int status)
1523 {
1524     if ((status & 0xff00) == 0xff00 || (status & 0x007f) != SIGQUIT)
1525         return status;
1526
1527     fflush (stdout);
1528     fflush (stderr);
1529     done (1);
1530     return 1;
1531 }