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, quoted;
 329     int xstdin, xlist, xpause, xtty;
 330     char *bp, *pp, *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     buflen = sizeof(buffer) - 1;
 359     bp[0] = bp[buflen] = '\0';
 360     quoted = 0;
 361
 362     /* Now parse display string */
 363     for ( ; *cp && buflen > 0; cp++) {
 364         if (*cp == '%') {
 365             pp = bp;
 366
 367             switch (*++cp) {
 368             case 'a':
 369                 /* insert parameters from Content-Type field */
 370             {
 371                 char **ap, **ep;
 372                 char *s = "";
 373
 374                 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
 375                     snprintf (bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
 376                     len = strlen (bp);
 377                     bp += len;
 378                     buflen -= len;
 379                     s = " ";
 380                 }
 381             }
 382             break;
 383
 384             case 'd':
 385                 /* insert content description */
 386                 if (ct->c_descr) {
 387                     char *s;
 388
 389                     s = trimcpy (ct->c_descr);
 390                     strncpy (bp, s, buflen);
 391                     free (s);
 392                 }
 393                 break;
 394
 395             case 'e':
 396                 /* exclusive execution */
 397                 xtty = 1;
 398                 break;
 399
 400             case 'F':
 401                 /* %e, %f, and stdin is terminal not content */
 402                 xstdin = 1;
 403                 xtty = 1;
 404                 /* and fall... */
 405
 406             case 'f':
 407                 /* insert filename containing content */
 408                 snprintf (bp, buflen, "%s", file);
 409                 break;
 410
 411             case 'p':
 412                 /* %l, and pause prior to displaying content */
 413                 xpause = pausesw;
 414                 /* and fall... */
 415
 416             case 'l':
 417                 /* display listing prior to displaying content */
 418                 xlist = !nolist;
 419                 break;
 420
 421             case 's':
 422                 /* insert subtype of content */
 423                 strncpy (bp, ci->ci_subtype, buflen);
 424                 break;
 425
 426             case '%':
 427                 /* insert character % */
 428                 goto raw;
 429
 430             default:
 431                 *bp++ = *--cp;
 432                 *bp = '\0';
 433                 buflen--;
 434                 continue;
 435             }
 436             len = strlen (bp);
 437             bp += len;
 438             buflen -= len;
 439
 440             /* Did we actually insert something? */
 441             if (bp != pp) {
 442                 /* Insert single quote if not inside quotes already */
 443                 if (!quoted && buflen) {
 444                     len = strlen (pp);
 445                     memmove (pp + 1, pp, len);
 446                     *pp++ = '\'';
 447                     buflen--;
 448                     bp++;
 449                 }
 450                 /* Escape existing quotes */
 451                 while ((pp = strchr (pp, '\'')) && buflen > 3) {
 452                     len = strlen (pp++);
 453                     memmove (pp + 3, pp, len);
 454                     *pp++ = '\\';
 455                     *pp++ = '\'';
 456                     *pp++ = '\'';
 457                     buflen -= 3;
 458                     bp += 3;
 459                 }
 460                 /* If pp is still set, that means we ran out of space. */
 461                 if (pp)
 462                     buflen = 0;
 463                 if (!quoted && buflen) {
 464                     *bp++ = '\'';
 465                     *bp = '\0';
 466                     buflen--;
 467                 }
 468             }
 469         } else {
 470 raw:
 471             *bp++ = *cp;
 472             *bp = '\0';
 473             buflen--;
 474
 475             if (*cp == '\'')
 476                 quoted = !quoted;
 477         }
 478     }
 479
 480     if (buflen <= 0 || (ct->c_termproc && buflen <= strlen(ct->c_termproc))) {
 481         /* content_error would provide a more useful error message
 482          * here, except that if we got overrun, it probably would
 483          * too.
 484          */
 485         fprintf(stderr, "Buffer overflow constructing show command!\n");
 486         return NOTOK;
 487     }
 488
 489     /* use charset string to modify display method */
 490     if (ct->c_termproc) {
 491         char term[BUFSIZ];
 492
 493         strncpy (term, buffer, sizeof(term));
 494         snprintf (buffer, sizeof(buffer), ct->c_termproc, term);
 495     }
 496
 497 got_command:
 498     return show_content_aux2 (ct, serial, alternate, cracked, buffer,
 499                               fd, xlist, xpause, xstdin, xtty);
 500 }
 501
 502
 503 /*
 504  * Routine to actually display the content
 505  */
 506
 507 static int
 508 show_content_aux2 (CT ct, int serial, int alternate, char *cracked, char *buffer,
 509                    int fd, int xlist, int xpause, int xstdin, int xtty)
 510 {
 511     pid_t child_id;
 512     int i;
 513     char *vec[4], exec[BUFSIZ + sizeof "exec "];
 514
 515     if (debugsw || cracked) {
 516         fflush (stdout);
 517
 518         fprintf (stderr, "%s msg %s", cracked ? "storing" : "show",
 519                  ct->c_file);
 520         if (ct->c_partno)
 521             fprintf (stderr, " part %s", ct->c_partno);
 522         if (cracked)
 523             fprintf (stderr, " using command (cd %s; %s)\n", cracked, buffer);
 524         else
 525             fprintf (stderr, " using command %s\n", buffer);
 526     }
 527
 528     if (xpid < 0 || (xtty && xpid)) {
 529         if (xpid < 0)
 530             xpid = -xpid;
 531         pidcheck(pidwait (xpid, NOTOK));
 532         xpid = 0;
 533     }
 534
 535     if (xlist) {
 536         char prompt[BUFSIZ];
 537
 538         if (ct->c_type == CT_MULTIPART)
 539             list_content (ct, -1, 1, 0, 0);
 540         else
 541             list_switch (ct, -1, 1, 0, 0);
 542
 543         if (xpause && SOprintf ("Press <return> to show content..."))
 544             printf ("Press <return> to show content...");
 545
 546         if (xpause) {
 547             int intr;
 548             SIGNAL_HANDLER istat;
 549
 550             istat = SIGNAL (SIGINT, intrser);
 551             if ((intr = sigsetjmp (intrenv, 1)) == OK) {
 552                 fflush (stdout);
 553                 prompt[0] = 0;
 554                 read (fileno (stdout), prompt, sizeof(prompt));
 555             }
 556             SIGNAL (SIGINT, istat);
 557             if (intr != OK || prompt[0] == 'n') {
 558                 (*ct->c_ceclosefnx) (ct);
 559                 return (alternate ? DONE : NOTOK);
 560             }
 561             if (prompt[0] == 'q') done(OK);
 562         }
 563     }
 564
 565     snprintf (exec, sizeof(exec), "exec %s", buffer);
 566
 567     vec[0] = "/bin/sh";
 568     vec[1] = "-c";
 569     vec[2] = exec;
 570     vec[3] = NULL;
 571
 572     fflush (stdout);
 573
 574     for (i = 0; (child_id = vfork ()) == NOTOK && i < 5; i++)
 575         sleep (5);
 576     switch (child_id) {
 577         case NOTOK:
 578             advise ("fork", "unable to");
 579             (*ct->c_ceclosefnx) (ct);
 580             return NOTOK;
 581
 582         case OK:
 583             if (cracked)
 584                 chdir (cracked);
 585             if (!xstdin)
 586                 dup2 (fd, 0);
 587             close (fd);
 588             execvp ("/bin/sh", vec);
 589             fprintf (stderr, "unable to exec ");
 590             perror ("/bin/sh");
 591             _exit (-1);
 592             /* NOTREACHED */
 593
 594         default:
 595             if (!serial) {
 596                 ct->c_pid = child_id;
 597                 if (xtty)
 598                     xpid = child_id;
 599             } else {
 600                 pidcheck (pidXwait (child_id, NULL));
 601             }
 602
 603             if (fd != NOTOK)
 604                 (*ct->c_ceclosefnx) (ct);
 605             return (alternate ? DONE : OK);
 606     }
 607 }
 608
 609
 610 /*
 611  * show content of type "text"
 612  */
 613
 614 static int
 615 show_text (CT ct, int serial, int alternate)
 616 {
 617     char *cp, buffer[BUFSIZ];
 618     CI ci = &ct->c_ctinfo;
 619
 620     /* Check for mhn-show-type/subtype */
 621     snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
 622                 invo_name, ci->ci_type, ci->ci_subtype);
 623     if ((cp = context_find (buffer)) && *cp != '\0')
 624         return show_content_aux (ct, serial, alternate, cp, NULL);
 625
 626     /* Check for mhn-show-type */
 627     snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
 628     if ((cp = context_find (buffer)) && *cp != '\0')
 629         return show_content_aux (ct, serial, alternate, cp, NULL);
 630
 631     /*
 632      * Use default method if content is text/plain, or if
 633      * if it is not a text part of a multipart/alternative
 634      */
 635     if (!alternate || ct->c_subtype == TEXT_PLAIN) {
 636         snprintf (buffer, sizeof(buffer), "%%p%s '%%F'", progsw ? progsw :
 637                 moreproc && *moreproc ? moreproc : "more");
 638         cp = (ct->c_showproc = add (buffer, NULL));
 639         return show_content_aux (ct, serial, alternate, cp, NULL);
 640     }
 641
 642     return NOTOK;
 643 }
 644
 645
 646 /*
 647  * show message body of type "multipart"
 648  */
 649
 650 static int
 651 show_multi (CT ct, int serial, int alternate)
 652 {
 653     char *cp, buffer[BUFSIZ];
 654     CI ci = &ct->c_ctinfo;
 655
 656     /* Check for mhn-show-type/subtype */
 657     snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
 658                 invo_name, ci->ci_type, ci->ci_subtype);
 659     if ((cp = context_find (buffer)) && *cp != '\0')
 660         return show_multi_aux (ct, serial, alternate, cp);
 661
 662     /* Check for mhn-show-type */
 663     snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
 664     if ((cp = context_find (buffer)) && *cp != '\0')
 665         return show_multi_aux (ct, serial, alternate, cp);
 666
 667     if ((cp = ct->c_showproc))
 668         return show_multi_aux (ct, serial, alternate, cp);
 669
 670     /*
 671      * Use default method to display this multipart content
 672      * if it is not a (nested) part of a multipart/alternative,
 673      * or if it is one of the known subtypes of multipart.
 674      */
 675     if (!alternate || ct->c_subtype != MULTI_UNKNOWN)
 676         return show_multi_internal (ct, serial, alternate);
 677
 678     return NOTOK;
 679 }
 680
 681
 682 /*
 683  * show message body of subtypes of multipart that
 684  * we understand directly (mixed, alternate, etc...)
 685  */
 686
 687 static int
 688 show_multi_internal (CT ct, int serial, int alternate)
 689 {
 690     int alternating, nowalternate, nowserial, result;
 691     struct multipart *m = (struct multipart *) ct->c_ctparams;
 692     struct part *part;
 693     CT p;
 694     sigset_t set, oset;
 695
 696     alternating = 0;
 697     nowalternate = alternate;
 698
 699     if (ct->c_subtype == MULTI_PARALLEL) {
 700         nowserial = serialsw;
 701     } else if (ct->c_subtype == MULTI_ALTERNATE) {
 702         nowalternate = 1;
 703         alternating  = 1;
 704         nowserial = serial;
 705     } else {
 706         /*
 707          * multipart/mixed
 708          * mutlipart/digest
 709          * unknown subtypes of multipart (treat as mixed per rfc2046)
 710          */
 711         nowserial = serial;
 712     }
 713
 714     /* block a few signals */
 715     if (!nowserial) {
 716         sigemptyset (&set);
 717         sigaddset (&set, SIGHUP);
 718         sigaddset (&set, SIGINT);
 719         sigaddset (&set, SIGQUIT);
 720         sigaddset (&set, SIGTERM);
 721         SIGPROCMASK (SIG_BLOCK, &set, &oset);
 722     }
 723
 724 /*
 725  * alternate   -> we are a part inside an multipart/alternative
 726  * alternating -> we are a multipart/alternative
 727  */
 728
 729     result = alternate ? NOTOK : OK;
 730
 731     for (part = m->mp_parts; part; part = part->mp_next) {
 732         p = part->mp_part;
 733
 734         if (part_ok (p, 0) && type_ok (p, 0)) {
 735             int inneresult;
 736
 737             inneresult = show_switch (p, nowserial, nowalternate);
 738             switch (inneresult) {
 739                 case NOTOK:
 740                     if (alternate && !alternating) {
 741                         result = NOTOK;
 742                         goto out;
 743                     }
 744                     continue;
 745
 746                 case OK:
 747                 case DONE:
 748                     if (alternating) {
 749                         result = DONE;
 750                         break;
 751                     }
 752                     if (alternate) {
 753                         alternate = nowalternate = 0;
 754                         if (result == NOTOK)
 755                             result = inneresult;
 756                     }
 757                     continue;
 758             }
 759             break;
 760         }
 761     }
 762
 763     if (alternating && !part) {
 764         if (!alternate)
 765             content_error (NULL, ct, "don't know how to display any of the contents");
 766         result = NOTOK;
 767         goto out;
 768     }
 769
 770     if (serial && !nowserial) {
 771         pid_t pid;
 772         int kids;
 773 #ifdef WAITINT
 774         int status;
 775 #else
 776         union wait status;
 777 #endif
 778
 779         kids = 0;
 780         for (part = m->mp_parts; part; part = part->mp_next) {
 781             p = part->mp_part;
 782
 783             if (p->c_pid > OK) {
 784                 if (kill (p->c_pid, 0) == NOTOK)
 785                     p->c_pid = 0;
 786                 else
 787                     kids++;
 788             }
 789         }
 790
 791         while (kids > 0 && (pid = wait (&status)) != NOTOK) {
 792 #ifdef WAITINT
 793             pidcheck (status);
 794 #else
 795             pidcheck (status.w_status);
 796 #endif
 797
 798             for (part = m->mp_parts; part; part = part->mp_next) {
 799                 p = part->mp_part;
 800
 801                 if (xpid == pid)
 802                     xpid = 0;
 803                 if (p->c_pid == pid) {
 804                     p->c_pid = 0;
 805                     kids--;
 806                     break;
 807                 }
 808             }
 809         }
 810     }
 811
 812 out:
 813     if (!nowserial) {
 814         /* reset the signal mask */
 815         SIGPROCMASK (SIG_SETMASK, &oset, &set);
 816     }
 817
 818     return result;
 819 }
 820
 821
 822 /*
 823  * Parse display string for multipart content
 824  * and use external program to display it.
 825  */
 826
 827 static int
 828 show_multi_aux (CT ct, int serial, int alternate, char *cp)
 829 {
 830     int len, buflen, quoted;
 831     int xlist, xpause, xtty;
 832     char *bp, *pp, *file, buffer[BUFSIZ];
 833     struct multipart *m = (struct multipart *) ct->c_ctparams;
 834     struct part *part;
 835     CI ci = &ct->c_ctinfo;
 836     CT p;
 837
 838     for (part = m->mp_parts; part; part = part->mp_next) {
 839         p = part->mp_part;
 840
 841         if (!p->c_ceopenfnx) {
 842             if (!alternate)
 843                 content_error (NULL, p, "don't know how to decode content");
 844             return NOTOK;
 845         }
 846
 847         if (p->c_storage == NULL) {
 848             file = NULL;
 849             if ((*p->c_ceopenfnx) (p, &file) == NOTOK)
 850                 return NOTOK;
 851
 852             /* I'm not sure if this is necessary? */
 853             p->c_storage = add (file, NULL);
 854
 855             if (p->c_showproc && !strcmp (p->c_showproc, "true"))
 856                 return (alternate ? DONE : OK);
 857             (*p->c_ceclosefnx) (p);
 858         }
 859     }
 860
 861     xlist     = 0;
 862     xpause    = 0;
 863     xtty      = 0;
 864
 865     /* get buffer ready to go */
 866     bp = buffer;
 867     buflen = sizeof(buffer) - 1;
 868     bp[0] = bp[buflen] = '\0';
 869     quoted = 0;
 870
 871     /* Now parse display string */
 872     for ( ; *cp; cp++) {
 873         if (*cp == '%') {
 874             switch (*++cp) {
 875             case 'a':
 876                 /* insert parameters from Content-Type field */
 877             {
 878                 char **ap, **ep;
 879                 char *s = "";
 880
 881                 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
 882                     snprintf (bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
 883                     len = strlen (bp);
 884                     bp += len;
 885                     buflen -= len;
 886                     s = " ";
 887                 }
 888             }
 889             break;
 890
 891             case 'd':
 892                 /* insert content description */
 893                 if (ct->c_descr) {
 894                     char *s;
 895
 896                     s = trimcpy (ct->c_descr);
 897                     strncpy (bp, s, buflen);
 898                     free (s);
 899                 }
 900                 break;
 901
 902             case 'e':
 903                 /* exclusive execution */
 904                 xtty = 1;
 905                 break;
 906
 907             case 'F':
 908                 /* %e and %f */
 909                 xtty = 1;
 910                 /* and fall... */
 911
 912             case 'f':
 913                 /* insert filename(s) containing content */
 914             {
 915                 char *s = "";
 916
 917                 for (part = m->mp_parts; part; part = part->mp_next) {
 918                     p = part->mp_part;
 919
 920                     snprintf (bp, buflen, "%s'%s'", s, p->c_storage);
 921                     len = strlen (bp);
 922                     bp += len;
 923                     buflen -= len;
 924                     s = " ";
 925                 }
 926             }
 927             break;
 928
 929             case 'p':
 930                 /* %l, and pause prior to displaying content */
 931                 xpause = pausesw;
 932                 /* and fall... */
 933
 934             case 'l':
 935                 /* display listing prior to displaying content */
 936                 xlist = !nolist;
 937                 break;
 938
 939             case 's':
 940                 /* insert subtype of content */
 941                 strncpy (bp, ci->ci_subtype, buflen);
 942                 break;
 943
 944             case '%':
 945                 /* insert character % */
 946                 goto raw;
 947
 948             default:
 949                 *bp++ = *--cp;
 950                 *bp = '\0';
 951                 buflen--;
 952                 continue;
 953             }
 954             len = strlen (bp);
 955             bp += len;
 956             buflen -= len;
 957
 958             /* Did we actually insert something? */
 959             if (bp != pp) {
 960                 /* Insert single quote if not inside quotes already */
 961                 if (!quoted && buflen) {
 962                     len = strlen (pp);
 963                     memmove (pp + 1, pp, len);
 964                     *pp++ = '\'';
 965                     buflen--;
 966                     bp++;
 967                 }
 968                 /* Escape existing quotes */
 969                 while ((pp = strchr (pp, '\'')) && buflen > 3) {
 970                     len = strlen (pp++);
 971                     memmove (pp + 3, pp, len);
 972                     *pp++ = '\\';
 973                     *pp++ = '\'';
 974                     *pp++ = '\'';
 975                     buflen -= 3;
 976                     bp += 3;
 977                 }
 978                 /* If pp is still set, that means we ran out of space. */
 979                 if (pp)
 980                     buflen = 0;
 981                 if (!quoted && buflen) {
 982                     *bp++ = '\'';
 983                     *bp = '\0';
 984                     buflen--;
 985                 }
 986             }
 987         } else {
 988 raw:
 989             *bp++ = *cp;
 990             *bp = '\0';
 991             buflen--;
 992
 993             if (*cp == '\'')
 994                 quoted = !quoted;
 995         }
 996     }
 997
 998     if (buflen <= 0 || (ct->c_termproc && buflen <= strlen(ct->c_termproc))) {
 999         /* content_error would provide a more useful error message
1000          * here, except that if we got overrun, it probably would
1001          * too.
1002          */
1003         fprintf(stderr, "Buffer overflow constructing show command!\n");
1004         return NOTOK;
1005     }
1006
1007     /* use charset string to modify display method */
1008     if (ct->c_termproc) {
1009         char term[BUFSIZ];
1010
1011         strncpy (term, buffer, sizeof(term));
1012         snprintf (buffer, sizeof(buffer), ct->c_termproc, term);
1013     }
1014
1015     return show_content_aux2 (ct, serial, alternate, NULL, buffer,
1016                               NOTOK, xlist, xpause, 0, xtty);
1017 }
1018
1019
1020 /*
1021  * show content of type "message/rfc822"
1022  */
1023
1024 static int
1025 show_message_rfc822 (CT ct, int serial, int alternate)
1026 {
1027     char *cp, buffer[BUFSIZ];
1028     CI ci = &ct->c_ctinfo;
1029
1030     /* Check for mhn-show-type/subtype */
1031     snprintf (buffer, sizeof(buffer), "%s-show-%s/%s",
1032                 invo_name, ci->ci_type, ci->ci_subtype);
1033     if ((cp = context_find (buffer)) && *cp != '\0')
1034         return show_content_aux (ct, serial, alternate, cp, NULL);
1035
1036     /* Check for mhn-show-type */
1037     snprintf (buffer, sizeof(buffer), "%s-show-%s", invo_name, ci->ci_type);
1038     if ((cp = context_find (buffer)) && *cp != '\0')
1039         return show_content_aux (ct, serial, alternate, cp, NULL);
1040
1041     if ((cp = ct->c_showproc))
1042         return show_content_aux (ct, serial, alternate, cp, NULL);
1043
1044     /* default method for message/rfc822 */
1045     if (ct->c_subtype == MESSAGE_RFC822) {
1046         cp = (ct->c_showproc = add ("%pshow -file '%F'", NULL));
1047         return show_content_aux (ct, serial, alternate, cp, NULL);
1048     }
1049
1050     /* complain if we are not a part of a multipart/alternative */
1051     if (!alternate)
1052         content_error (NULL, ct, "don't know how to display content");
1053
1054     return NOTOK;
1055 }
1056
1057
1058 /*
1059  * Show content of type "message/partial".
1060  */
1061
1062 static int
1063 show_partial (CT ct, int serial, int alternate)
1064 {
1065     content_error (NULL, ct,
1066         "in order to display this message, you must reassemble it");
1067     return NOTOK;
1068 }
1069
1070
1071 /*
1072  * Show content of type "message/external".
1073  *
1074  * THE ERROR CHECKING IN THIS ONE IS NOT DONE YET.
1075  */
1076
1077 static int
1078 show_external (CT ct, int serial, int alternate)
1079 {
1080     struct exbody *e = (struct exbody *) ct->c_ctparams;
1081     CT p = e->eb_content;
1082
1083     if (!type_ok (p, 0))
1084         return OK;
1085
1086     return show_switch (p, serial, alternate);
1087
1088 #if 0
1089     content_error (NULL, p, "don't know how to display content");
1090     return NOTOK;
1091 #endif
1092 }
1093
1094
1095 static RETSIGTYPE
1096 intrser (int i)
1097 {
1098 #ifndef RELIABLE_SIGNALS
1099     SIGNAL (SIGINT, intrser);
1100 #endif
1101
1102     putchar ('\n');
1103     siglongjmp (intrenv, DONE);
1104 }