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

   1
   2 /*
   3  * mhshowsbr.c -- routines to display the contents of MIME messages
   4  *
   5  * $Id$
   6  */
   7
   8 #include <h/mh.h>
   9 #include <fcntl.h>
  10 #include <h/signals.h>
  11 #include <h/md5.h>
  12 #include <errno.h>
  13 #include <setjmp.h>
  14 #include <signal.h>
  15 #include <zotnet/mts/mts.h>
  16 #include <zotnet/tws/tws.h>
  17 #include <h/mime.h>
  18 #include <h/mhparse.h>
  19
  20 #ifdef HAVE_SYS_WAIT_H
  21 # include <sys/wait.h>
  22 #endif
  23
  24 /*
  25  * Just use sigjmp/longjmp on older machines that
  26  * don't have sigsetjmp/siglongjmp.
  27  */
  28 #ifndef HAVE_SIGSETJMP
  29 # define sigjmp_buf jmp_buf
  30 # define sigsetjmp(env,mask) setjmp(env)
  31 # define siglongjmp(env,val) longjmp(env,val)
  32 #endif
  33
  34 extern int errno;
  35 extern int debugsw;
  36
  37 int pausesw  = 1;
  38 int serialsw = 0;
  39 int nolist   = 0;
  40
  41 char *progsw = NULL;
  42
  43 /* flags for moreproc/header display */
  44 int nomore   = 0;
  45 char *formsw = NULL;
  46
  47 pid_t xpid = 0;
  48
  49 static sigjmp_buf intrenv;
  50
  51
  52 /* termsbr.c */
  53 int SOprintf (char *, ...);
  54
  55 /* mhparse.c */
  56 int pidcheck (int);
  57
  58 /* mhmisc.c */
  59 int part_ok (CT, int);
  60 int type_ok (CT, int);
  61 void content_error (char *, CT, char *, ...);
  62 void flush_errors (void);
  63
  64 /* mhlistsbr.c */
  65 int list_switch (CT, int, int, int, int);
  66 int list_content (CT, int, int, int, int);
  67
  68 /*
  69  * prototypes
  70  */
  71 void show_all_messages (CT *);
  72 int show_content_aux (CT, int, int, char *, char *);
  73
  74 /*
  75  * static prototypes
  76  */
  77 static void show_single_message (CT, char *);
  78 static void DisplayMsgHeader (CT, char *);
  79 static int show_switch (CT, int, int);
  80 static int show_content (CT, int, int);
  81 static int show_content_aux2 (CT, int, int, char *, char *, int, int, int, int, int);
  82 static int show_text (CT, int, int);
  83 static int show_multi (CT, int, int);
  84 static int show_multi_internal (CT, int, int);
  85 static int show_multi_aux (CT, int, int, char *);
  86 static int show_message_rfc822 (CT, int, int);
  87 static int show_partial (CT, int, int);
  88 static int show_external (CT, int, int);
  89 static RETSIGTYPE intrser (int);
  90
  91
  92 /*
  93  * Top level entry point to show/display a group of messages
  94  */
  95
  96 void
  97 show_all_messages (CT *cts)
  98 {
  99     CT ct, *ctp;
 100
 101     /*
 102      * If form is not specified, then get default form
 103      * for showing headers of MIME messages.
 104      */
 105     if (!formsw)
 106         formsw = getcpy (etcpath ("mhl.headers"));
 107
 108     /*
 109      * If form is "mhl.null", suppress display of header.
 110      */
 111     if (!strcmp (formsw, "mhl.null"))
 112         formsw = NULL;
 113
 114     for (ctp = cts; *ctp; ctp++) {
 115         ct = *ctp;
 116
 117         /* if top-level type is ok, then display message */
 118         if (type_ok (ct, 0))
 119             show_single_message (ct, formsw);
 120     }
 121 }
 122
 123
 124 /*
 125  * Entry point to show/display a single message
 126  */
 127
 128 static void
 129 show_single_message (CT ct, char *form)
 130 {
 131     sigset_t set, oset;
 132
 133 #ifdef WAITINT
 134     int status;
 135 #else
 136     union wait status;
 137 #endif
 138
 139     umask (ct->c_umask);
 140
 141     /*
 142      * If you have a format file, then display
 143      * the message headers.
 144      */
 145     if (form)
 146         DisplayMsgHeader(ct, form);
 147     else
 148         xpid = 0;
 149
 150     /* Show the body of the message */
 151     show_switch (ct, 1, 0);
 152
 153     if (ct->c_fp) {
 154         fclose (ct->c_fp);
 155         ct->c_fp = NULL;
 156     }
 157     if (ct->c_ceclosefnx)
 158         (*ct->c_ceclosefnx) (ct);
 159
 160     /* block a few signals */
 161     sigemptyset (&set);
 162     sigaddset (&set, SIGHUP);
 163     sigaddset (&set, SIGINT);
 164     sigaddset (&set, SIGQUIT);
 165     sigaddset (&set, SIGTERM);
 166     SIGPROCMASK (SIG_BLOCK, &set, &oset);
 167
 168     while (wait (&status) != NOTOK) {
 169 #ifdef WAITINT
 170         pidcheck (status);
 171 #else
 172         pidcheck (status.w_status);
 173 #endif
 174         continue;
 175     }
 176
 177     /* reset the signal mask */
 178     SIGPROCMASK (SIG_SETMASK, &oset, &set);
 179
 180     xpid = 0;
 181     flush_errors ();
 182 }
 183
 184
 185 /*
 186  * Use the mhlproc to show the header fields
 187  */
 188
 189 static void
 190 DisplayMsgHeader (CT ct, char *form)
 191 {
 192     pid_t child_id;
 193     int i, vecp;
 194     char *vec[8];
 195
 196     vecp = 0;
 197     vec[vecp++] = r1bindex (mhlproc, '/');
 198     vec[vecp++] = "-form";
 199     vec[vecp++] = form;
 200     vec[vecp++] = "-nobody";
 201     vec[vecp++] = ct->c_file;
 202
 203     /*
 204      * If we've specified -(no)moreproc,
 205      * then just pass that along.
 206      */
 207     if (nomore) {
 208         vec[vecp++] = "-nomoreproc";
 209     } else if (progsw) {
 210         vec[vecp++] = "-moreproc";
 211         vec[vecp++] = progsw;
 212     }
 213     vec[vecp] = NULL;
 214
 215     fflush (stdout);
 216
 217     for (i = 0; (child_id = vfork()) == NOTOK && i < 5; i++)
 218         sleep (5);
 219
 220     switch (child_id) {
 221     case NOTOK:
 222         adios ("fork", "unable to");
 223         /* NOTREACHED */
 224
 225     case OK:
 226         execvp (mhlproc, vec);
 227         fprintf (stderr, "unable to exec ");
 228         perror (mhlproc);
 229         _exit (-1);
 230         /* NOTREACHED */
 231
 232     default:
 233         xpid = -child_id;
 234         break;
 235     }
 236 }
 237
 238
 239 /*
 240  * Switching routine.  Call the correct routine
 241  * based on content type.
 242  */
 243
 244 static int
 245 show_switch (CT ct, int serial, int alternate)
 246 {
 247     switch (ct->c_type) {
 248         case CT_MULTIPART:
 249             return show_multi (ct, serial, alternate);
 250             break;
 251
 252         case CT_MESSAGE:
 253             switch (ct->c_subtype) {
 254                 case MESSAGE_PARTIAL:
 255                     return show_partial (ct, serial, alternate);
 256                     break;
 257
 258                 case MESSAGE_EXTERNAL:
 259                     return show_external (ct, serial, alternate);
 260                     break;
 261
 262                 case MESSAGE_RFC822:
 263                 default:
 264                     return show_message_rfc822 (ct, serial, alternate);
 265                     break;
 266             }
 267             break;
 268
 269         case CT_TEXT:
 270             return show_text (ct, serial, alternate);
 271             break;
 272
 273         case CT_AUDIO:
 274         case CT_IMAGE:
 275         case CT_VIDEO:
 276         case CT_APPLICATION:
 277             return show_content (ct, serial, alternate);
 278             break;
 279
 280         default:
 281             adios (NULL, "unknown content type %d", ct->c_type);
 282             break;
 283     }
 284
 285     return 0;   /* NOT REACHED */
 286 }
 287
 288
 289 /*
 290  * Generic method for displaying content
 291  */
 292
 293 static int
 294 show_content (CT ct, int serial, int alternate)
 295 {
 296     char *cp, buffer[BUFSIZ];
 297     CI ci = &ct->c_ctinfo;
 298
 299     /* Check for mhn-show-type/subtype */
 300     snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
 301                 invo_name, ci->ci_type, ci->ci_subtype);
 302     if ((cp = context_find (buffer)) && *cp != '\0')
 303         return show_content_aux (ct, serial, alternate, cp, NULL);
 304
 305     /* Check for mhn-show-type */
 306     snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
 307     if ((cp = context_find (buffer)) && *cp != '\0')
 308         return show_content_aux (ct, serial, alternate, cp, NULL);
 309
 310     if ((cp = ct->c_showproc))
 311         return show_content_aux (ct, serial, alternate, cp, NULL);
 312
 313     /* complain if we are not a part of a multipart/alternative */
 314     if (!alternate)
 315         content_error (NULL, ct, "don't know how to display content");
 316
 317     return NOTOK;
 318 }
 319
 320
 321 /*
 322  * Parse the display string for displaying generic content
 323  */
 324
 325 int
 326 show_content_aux (CT ct, int serial, int alternate, char *cp, char *cracked)
 327 {
 328     int fd, len, buflen;
 329     int xstdin, xlist, xpause, xtty;
 330     char *bp, *file, buffer[BUFSIZ];
 331     CI ci = &ct->c_ctinfo;
 332
 333     if (!ct->c_ceopenfnx) {
 334         if (!alternate)
 335             content_error (NULL, ct, "don't know how to decode content");
 336
 337         return NOTOK;
 338     }
 339
 340     file = NULL;
 341     if ((fd = (*ct->c_ceopenfnx) (ct, &file)) == NOTOK)
 342         return NOTOK;
 343     if (ct->c_showproc && !strcmp (ct->c_showproc, "true"))
 344         return (alternate ? DONE : OK);
 345
 346     xlist  = 0;
 347     xpause = 0;
 348     xstdin = 0;
 349     xtty   = 0;
 350
 351     if (cracked) {
 352         strncpy (buffer, cp, sizeof(buffer));
 353         goto got_command;
 354     }
 355
 356     /* get buffer ready to go */
 357     bp = buffer;
 358     bp[0] = '\0';
 359     buflen = sizeof(buffer);
 360
 361     /* Now parse display string */
 362     for ( ; *cp; cp++) {
 363         if (*cp == '%') {
 364             switch (*++cp) {
 365             case 'a':
 366                 /* insert parameters from Content-Type field */
 367             {
 368                 char **ap, **ep;
 369                 char *s = "";
 370
 371                 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
 372                     snprintf (bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
 373                     len = strlen (bp);
 374                     bp += len;
 375                     buflen -= len;
 376                     s = " ";
 377                 }
 378             }
 379             break;
 380
 381             case 'd':
 382                 /* insert content description */
 383                 if (ct->c_descr) {
 384                     char *s;
 385
 386                     s = trimcpy (ct->c_descr);
 387                     strncpy (bp, s, buflen);
 388                     free (s);
 389                 }
 390                 break;
 391
 392             case 'e':
 393                 /* exclusive execution */
 394                 xtty = 1;
 395                 break;
 396
 397             case 'F':
 398                 /* %e, %f, and stdin is terminal not content */
 399                 xstdin = 1;
 400                 xtty = 1;
 401                 /* and fall... */
 402
 403             case 'f':
 404                 /* insert filename containing content */
 405                 snprintf (bp, buflen, "%s", file);
 406                 break;
 407
 408             case 'p':
 409                 /* %l, and pause prior to displaying content */
 410                 xpause = pausesw;
 411                 /* and fall... */
 412
 413             case 'l':
 414                 /* display listing prior to displaying content */
 415                 xlist = !nolist;
 416                 break;
 417
 418             case 's':
 419                 /* insert subtype of content */
 420                 strncpy (bp, ci->ci_subtype, buflen);
 421                 break;
 422
 423             case '%':
 424                 /* insert character % */
 425                 goto raw;
 426
 427             default:
 428                 *bp++ = *--cp;
 429                 *bp = '\0';
 430                 buflen--;
 431                 continue;
 432             }
 433             len = strlen (bp);
 434             bp += len;
 435             buflen -= len;
 436         } else {
 437 raw:
 438         *bp++ = *cp;
 439         *bp = '\0';
 440         buflen--;
 441         }
 442     }
 443
 444     /* use charset string to modify display method */
 445     if (ct->c_termproc) {
 446         char term[BUFSIZ];
 447
 448         strncpy (term, buffer, sizeof(term));
 449         snprintf (buffer, sizeof(buffer), ct->c_termproc, term);
 450     }
 451
 452 got_command:
 453     return show_content_aux2 (ct, serial, alternate, cracked, buffer,
 454                               fd, xlist, xpause, xstdin, xtty);
 455 }
 456
 457
 458 /*
 459  * Routine to actually display the content
 460  */
 461
 462 static int
 463 show_content_aux2 (CT ct, int serial, int alternate, char *cracked, char *buffer,
 464                    int fd, int xlist, int xpause, int xstdin, int xtty)
 465 {
 466     pid_t child_id;
 467     int i;
 468     char *vec[4], exec[BUFSIZ + sizeof "exec "];
 469
 470     if (debugsw || cracked) {
 471         fflush (stdout);
 472
 473         fprintf (stderr, "%s msg %s", cracked ? "storing" : "show",
 474                  ct->c_file);
 475         if (ct->c_partno)
 476             fprintf (stderr, " part %s", ct->c_partno);
 477         if (cracked)
 478             fprintf (stderr, " using command (cd %s; %s)\n", cracked, buffer);
 479         else
 480             fprintf (stderr, " using command %s\n", buffer);
 481     }
 482
 483     if (xpid < 0 || (xtty && xpid)) {
 484         if (xpid < 0)
 485             xpid = -xpid;
 486         pidcheck(pidwait (xpid, NOTOK));
 487         xpid = 0;
 488     }
 489
 490     if (xlist) {
 491         char prompt[BUFSIZ];
 492
 493         if (ct->c_type == CT_MULTIPART)
 494             list_content (ct, -1, 1, 0, 0);
 495         else
 496             list_switch (ct, -1, 1, 0, 0);
 497
 498         if (xpause && SOprintf ("Press <return> to show content..."))
 499             printf ("Press <return> to show content...");
 500
 501         if (xpause) {
 502             int intr;
 503             SIGNAL_HANDLER istat;
 504
 505             istat = SIGNAL (SIGINT, intrser);
 506             if ((intr = sigsetjmp (intrenv, 1)) == OK) {
 507                 fflush (stdout);
 508                 prompt[0] = 0;
 509                 read (fileno (stdout), prompt, sizeof(prompt));
 510             }
 511             SIGNAL (SIGINT, istat);
 512             if (intr != OK) {
 513                 (*ct->c_ceclosefnx) (ct);
 514                 return (alternate ? DONE : NOTOK);
 515             }
 516         }
 517     }
 518
 519     snprintf (exec, sizeof(exec), "exec %s", buffer);
 520
 521     vec[0] = "/bin/sh";
 522     vec[1] = "-c";
 523     vec[2] = exec;
 524     vec[3] = NULL;
 525
 526     fflush (stdout);
 527
 528     for (i = 0; (child_id = vfork ()) == NOTOK && i < 5; i++)
 529         sleep (5);
 530     switch (child_id) {
 531         case NOTOK:
 532             advise ("fork", "unable to");
 533             (*ct->c_ceclosefnx) (ct);
 534             return NOTOK;
 535
 536         case OK:
 537             if (cracked)
 538                 chdir (cracked);
 539             if (!xstdin)
 540                 dup2 (fd, 0);
 541             close (fd);
 542             execvp ("/bin/sh", vec);
 543             fprintf (stderr, "unable to exec ");
 544             perror ("/bin/sh");
 545             _exit (-1);
 546             /* NOTREACHED */
 547
 548         default:
 549             if (!serial) {
 550                 ct->c_pid = child_id;
 551                 if (xtty)
 552                     xpid = child_id;
 553             } else {
 554                 pidcheck (pidXwait (child_id, NULL));
 555             }
 556
 557             if (fd != NOTOK)
 558                 (*ct->c_ceclosefnx) (ct);
 559             return (alternate ? DONE : OK);
 560     }
 561 }
 562
 563
 564 /*
 565  * show content of type "text"
 566  */
 567
 568 static int
 569 show_text (CT ct, int serial, int alternate)
 570 {
 571     char *cp, buffer[BUFSIZ];
 572     CI ci = &ct->c_ctinfo;
 573
 574     /* Check for mhn-show-type/subtype */
 575     snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
 576                 invo_name, ci->ci_type, ci->ci_subtype);
 577     if ((cp = context_find (buffer)) && *cp != '\0')
 578         return show_content_aux (ct, serial, alternate, cp, NULL);
 579
 580     /* Check for mhn-show-type */
 581     snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
 582     if ((cp = context_find (buffer)) && *cp != '\0')
 583         return show_content_aux (ct, serial, alternate, cp, NULL);
 584
 585     /*
 586      * Use default method if content is text/plain, or if
 587      * if it is not a text part of a multipart/alternative
 588      */
 589     if (!alternate || ct->c_subtype == TEXT_PLAIN) {
 590         snprintf (buffer, sizeof(buffer), "%%p%s '%%F'", progsw ? progsw :
 591                 moreproc && *moreproc ? moreproc : "more");
 592         cp = (ct->c_showproc = add (buffer, NULL));
 593         return show_content_aux (ct, serial, alternate, cp, NULL);
 594     }
 595
 596     return NOTOK;
 597 }
 598
 599
 600 /*
 601  * show message body of type "multipart"
 602  */
 603
 604 static int
 605 show_multi (CT ct, int serial, int alternate)
 606 {
 607     char *cp, buffer[BUFSIZ];
 608     CI ci = &ct->c_ctinfo;
 609
 610     /* Check for mhn-show-type/subtype */
 611     snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
 612                 invo_name, ci->ci_type, ci->ci_subtype);
 613     if ((cp = context_find (buffer)) && *cp != '\0')
 614         return show_multi_aux (ct, serial, alternate, cp);
 615
 616     /* Check for mhn-show-type */
 617     snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
 618     if ((cp = context_find (buffer)) && *cp != '\0')
 619         return show_multi_aux (ct, serial, alternate, cp);
 620
 621     if ((cp = ct->c_showproc))
 622         return show_multi_aux (ct, serial, alternate, cp);
 623
 624     /*
 625      * Use default method to display this multipart content
 626      * if it is not a (nested) part of a multipart/alternative,
 627      * or if it is one of the known subtypes of multipart.
 628      */
 629     if (!alternate || ct->c_subtype != MULTI_UNKNOWN)
 630         return show_multi_internal (ct, serial, alternate);
 631
 632     return NOTOK;
 633 }
 634
 635
 636 /*
 637  * show message body of subtypes of multipart that
 638  * we understand directly (mixed, alternate, etc...)
 639  */
 640
 641 static int
 642 show_multi_internal (CT ct, int serial, int alternate)
 643 {
 644     int alternating, nowalternate, nowserial, result;
 645     struct multipart *m = (struct multipart *) ct->c_ctparams;
 646     struct part *part;
 647     CT p;
 648     sigset_t set, oset;
 649
 650     alternating = 0;
 651     nowalternate = alternate;
 652
 653     if (ct->c_subtype == MULTI_PARALLEL) {
 654         nowserial = serialsw;
 655     } else if (ct->c_subtype == MULTI_ALTERNATE) {
 656         nowalternate = 1;
 657         alternating  = 1;
 658         nowserial = serial;
 659     } else {
 660         /*
 661          * multipart/mixed
 662          * mutlipart/digest
 663          * unknown subtypes of multipart (treat as mixed per rfc2046)
 664          */
 665         nowserial = serial;
 666     }
 667
 668     /* block a few signals */
 669     if (!nowserial) {
 670         sigemptyset (&set);
 671         sigaddset (&set, SIGHUP);
 672         sigaddset (&set, SIGINT);
 673         sigaddset (&set, SIGQUIT);
 674         sigaddset (&set, SIGTERM);
 675         SIGPROCMASK (SIG_BLOCK, &set, &oset);
 676     }
 677
 678 /*
 679  * alternate   -> we are a part inside an multipart/alternative
 680  * alternating -> we are a multipart/alternative
 681  */
 682
 683     result = alternate ? NOTOK : OK;
 684
 685     for (part = m->mp_parts; part; part = part->mp_next) {
 686         p = part->mp_part;
 687
 688         if (part_ok (p, 0) && type_ok (p, 0)) {
 689             int inneresult;
 690
 691             inneresult = show_switch (p, nowserial, nowalternate);
 692             switch (inneresult) {
 693                 case NOTOK:
 694                     if (alternate && !alternating) {
 695                         result = NOTOK;
 696                         goto out;
 697                     }
 698                     continue;
 699
 700                 case OK:
 701                 case DONE:
 702                     if (alternating) {
 703                         result = DONE;
 704                         break;
 705                     }
 706                     if (alternate) {
 707                         alternate = nowalternate = 0;
 708                         if (result == NOTOK)
 709                             result = inneresult;
 710                     }
 711                     continue;
 712             }
 713             break;
 714         }
 715     }
 716
 717     if (alternating && !part) {
 718         if (!alternate)
 719             content_error (NULL, ct, "don't know how to display any of the contents");
 720         result = NOTOK;
 721         goto out;
 722     }
 723
 724     if (serial && !nowserial) {
 725         pid_t pid;
 726         int kids;
 727 #ifdef WAITINT
 728         int status;
 729 #else
 730         union wait status;
 731 #endif
 732
 733         kids = 0;
 734         for (part = m->mp_parts; part; part = part->mp_next) {
 735             p = part->mp_part;
 736
 737             if (p->c_pid > OK)
 738                 if (kill (p->c_pid, 0) == NOTOK)
 739                     p->c_pid = 0;
 740                 else
 741                     kids++;
 742         }
 743
 744         while (kids > 0 && (pid = wait (&status)) != NOTOK) {
 745 #ifdef WAITINT
 746             pidcheck (status);
 747 #else
 748             pidcheck (status.w_status);
 749 #endif
 750
 751             for (part = m->mp_parts; part; part = part->mp_next) {
 752                 p = part->mp_part;
 753
 754                 if (xpid == pid)
 755                     xpid = 0;
 756                 if (p->c_pid == pid) {
 757                     p->c_pid = 0;
 758                     kids--;
 759                     break;
 760                 }
 761             }
 762         }
 763     }
 764
 765 out:
 766     if (!nowserial) {
 767         /* reset the signal mask */
 768         SIGPROCMASK (SIG_SETMASK, &oset, &set);
 769     }
 770
 771     return result;
 772 }
 773
 774
 775 /*
 776  * Parse display string for multipart content
 777  * and use external program to display it.
 778  */
 779
 780 static int
 781 show_multi_aux (CT ct, int serial, int alternate, char *cp)
 782 {
 783     int len, buflen;
 784     int xlist, xpause, xtty;
 785     char *bp, *file, buffer[BUFSIZ];
 786     struct multipart *m = (struct multipart *) ct->c_ctparams;
 787     struct part *part;
 788     CI ci = &ct->c_ctinfo;
 789     CT p;
 790
 791     for (part = m->mp_parts; part; part = part->mp_next) {
 792         p = part->mp_part;
 793
 794         if (!p->c_ceopenfnx) {
 795             if (!alternate)
 796                 content_error (NULL, p, "don't know how to decode content");
 797             return NOTOK;
 798         }
 799
 800         if (p->c_storage == NULL) {
 801             file = NULL;
 802             if ((*p->c_ceopenfnx) (p, &file) == NOTOK)
 803                 return NOTOK;
 804
 805             /* I'm not sure if this is necessary? */
 806             p->c_storage = add (file, NULL);
 807
 808             if (p->c_showproc && !strcmp (p->c_showproc, "true"))
 809                 return (alternate ? DONE : OK);
 810             (*p->c_ceclosefnx) (p);
 811         }
 812     }
 813
 814     xlist     = 0;
 815     xpause    = 0;
 816     xtty      = 0;
 817
 818     /* get buffer ready to go */
 819     bp = buffer;
 820     bp[0] = '\0';
 821     buflen = sizeof(buffer);
 822
 823     /* Now parse display string */
 824     for ( ; *cp; cp++) {
 825         if (*cp == '%') {
 826             switch (*++cp) {
 827             case 'a':
 828                 /* insert parameters from Content-Type field */
 829             {
 830                 char **ap, **ep;
 831                 char *s = "";
 832
 833                 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
 834                     snprintf (bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
 835                     len = strlen (bp);
 836                     bp += len;
 837                     buflen -= len;
 838                     s = " ";
 839                 }
 840             }
 841             break;
 842
 843             case 'd':
 844                 /* insert content description */
 845                 if (ct->c_descr) {
 846                     char *s;
 847
 848                     s = trimcpy (ct->c_descr);
 849                     strncpy (bp, s, buflen);
 850                     free (s);
 851                 }
 852                 break;
 853
 854             case 'e':
 855                 /* exclusive execution */
 856                 xtty = 1;
 857                 break;
 858
 859             case 'F':
 860                 /* %e and %f */
 861                 xtty = 1;
 862                 /* and fall... */
 863
 864             case 'f':
 865                 /* insert filename(s) containing content */
 866             {
 867                 char *s = "";
 868
 869                 for (part = m->mp_parts; part; part = part->mp_next) {
 870                     p = part->mp_part;
 871
 872                     snprintf (bp, buflen, "%s'%s'", s, p->c_storage);
 873                     len = strlen (bp);
 874                     bp += len;
 875                     buflen -= len;
 876                     s = " ";
 877                 }
 878             }
 879             break;
 880
 881             case 'p':
 882                 /* %l, and pause prior to displaying content */
 883                 xpause = pausesw;
 884                 /* and fall... */
 885
 886             case 'l':
 887                 /* display listing prior to displaying content */
 888                 xlist = !nolist;
 889                 break;
 890
 891             case 's':
 892                 /* insert subtype of content */
 893                 strncpy (bp, ci->ci_subtype, buflen);
 894                 break;
 895
 896             case '%':
 897                 /* insert character % */
 898                 goto raw;
 899
 900             default:
 901                 *bp++ = *--cp;
 902                 *bp = '\0';
 903                 buflen--;
 904                 continue;
 905             }
 906             len = strlen (bp);
 907             bp += len;
 908             buflen -= len;
 909         } else {
 910 raw:
 911         *bp++ = *cp;
 912         *bp = '\0';
 913         buflen--;
 914         }
 915     }
 916
 917     /* use charset string to modify display method */
 918     if (ct->c_termproc) {
 919         char term[BUFSIZ];
 920
 921         strncpy (term, buffer, sizeof(term));
 922         snprintf (buffer, sizeof(buffer), ct->c_termproc, term);
 923     }
 924
 925     return show_content_aux2 (ct, serial, alternate, NULL, buffer,
 926                               NOTOK, xlist, xpause, 0, xtty);
 927 }
 928
 929
 930 /*
 931  * show content of type "message/rfc822"
 932  */
 933
 934 static int
 935 show_message_rfc822 (CT ct, int serial, int alternate)
 936 {
 937     char *cp, buffer[BUFSIZ];
 938     CI ci = &ct->c_ctinfo;
 939
 940     /* Check for mhn-show-type/subtype */
 941     snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
 942                 invo_name, ci->ci_type, ci->ci_subtype);
 943     if ((cp = context_find (buffer)) && *cp != '\0')
 944         return show_content_aux (ct, serial, alternate, cp, NULL);
 945
 946     /* Check for mhn-show-type */
 947     snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
 948     if ((cp = context_find (buffer)) && *cp != '\0')
 949         return show_content_aux (ct, serial, alternate, cp, NULL);
 950
 951     if ((cp = ct->c_showproc))
 952         return show_content_aux (ct, serial, alternate, cp, NULL);
 953
 954     /* default method for message/rfc822 */
 955     if (ct->c_subtype == MESSAGE_RFC822) {
 956         cp = (ct->c_showproc = add ("%pshow -file '%F'", NULL));
 957         return show_content_aux (ct, serial, alternate, cp, NULL);
 958     }
 959
 960     /* complain if we are not a part of a multipart/alternative */
 961     if (!alternate)
 962         content_error (NULL, ct, "don't know how to display content");
 963
 964     return NOTOK;
 965 }
 966
 967
 968 /*
 969  * Show content of type "message/partial".
 970  */
 971
 972 static int
 973 show_partial (CT ct, int serial, int alternate)
 974 {
 975     content_error (NULL, ct,
 976         "in order to display this message, you must reassemble it");
 977     return NOTOK;
 978 }
 979
 980
 981 /*
 982  * Show content of type "message/external".
 983  *
 984  * THE ERROR CHECKING IN THIS ONE IS NOT DONE YET.
 985  */
 986
 987 static int
 988 show_external (CT ct, int serial, int alternate)
 989 {
 990     struct exbody *e = (struct exbody *) ct->c_ctparams;
 991     CT p = e->eb_content;
 992
 993     if (!type_ok (p, 0))
 994         return OK;
 995
 996     return show_switch (p, serial, alternate);
 997
 998 #if 0
 999     content_error (NULL, p, "don't know how to display content");
1000     return NOTOK;
1001 #endif
1002 }
1003
1004
1005 static RETSIGTYPE
1006 intrser (int i)
1007 {
1008 #ifndef RELIABLE_SIGNALS
1009     SIGNAL (SIGINT, intrser);
1010 #endif
1011
1012     putchar ('\n');
1013     siglongjmp (intrenv, DONE);
1014 }