git.marmaro.de Git - mmh/blob - uip/repl.c

   1 /*
   2 ** repl.c -- reply to a message
   3 **
   4 ** This code is Copyright (c) 2002, by the authors of nmh.  See the
   5 ** COPYRIGHT file in the root directory of the nmh distribution for
   6 ** complete copyright information.
   7 */
   8
   9 #include <h/mh.h>
  10 #include <h/utils.h>
  11 #include <h/addrsbr.h>
  12 #include <h/fmt_scan.h>
  13 #include <sys/file.h>  /* L_SET */
  14 #include <errno.h>
  15
  16
  17 static struct swit switches[] = {
  18 #define GROUPSW  0
  19         { "group", 0 },
  20 #define NGROUPSW  1
  21         { "nogroup", 0 },
  22 #define ANNOSW  2
  23         { "annotate", 0 },
  24 #define NANNOSW  3
  25         { "noannotate", 0 },
  26 #define CCSW  4
  27         { "cc all|to|cc|me", 0 },
  28 #define NCCSW  5
  29         { "nocc type", 0 },
  30 #define EDITRSW  6
  31         { "editor editor", 0 },
  32 #define FILTSW  7
  33         { "filter filterfile", 0 },
  34 #define NFILTSW  8
  35         { "nofilter", 0 },
  36 #define FORMSW  9
  37         { "form formfile", 0 },
  38 #define MIMESW  10
  39         { "mime", 0 },
  40 #define NMIMESW  11
  41         { "nomime", 0 },
  42 #define QURYSW  12
  43         { "query", 0 },
  44 #define NQURYSW  13
  45         { "noquery", 0 },
  46 #define WHATSW  14
  47         { "whatnowproc program", 0 },
  48 #define VERSIONSW  15
  49         { "version", 0 },
  50 #define HELPSW  16
  51         { "help", 0 },
  52 #define FILESW  17
  53         { "file file", 4 },  /* interface from msh */
  54 #ifdef MHE
  55 # define BILDSW  18
  56         { "build", 5 },  /* interface from mhe */
  57 #endif
  58         { NULL, 0 }
  59 };
  60
  61 static struct swit ccswitches[] = {
  62 #define CTOSW  0
  63         { "to", 0 },
  64 #define CCCSW  1
  65         { "cc", 0 },
  66 #define CMESW  2
  67         { "me", 0 },
  68 #define CALSW  3
  69         { "all", 0 },
  70         { NULL, 0 }
  71 };
  72
  73 /*
  74 ** Buffer size for content part of header fields.
  75 ** We want this to be large enough so that we don't
  76 ** do a lot of extra FLDPLUS calls on m_getfld but
  77 ** small enough so that we don't snarf the entire
  78 ** message body when we're not going to use any of it.
  79 */
  80 #define SBUFSIZ 256
  81
  82 static short ccto = -1;
  83 static short cccc = -1;
  84 static short ccme = -1;
  85 static short querysw = 0;
  86
  87 static short groupreply = 0;  /* Is this a group reply? */
  88
  89 static int mime = 0;  /* include original as MIME part */
  90 static char *form   = NULL;  /* form (components) file */
  91 static char *filter = NULL;  /* message filter file */
  92
  93 static int dftype=0;
  94
  95 static char *badaddrs = NULL;
  96 static char *dfhost = NULL;
  97
  98 static struct mailname mq;
  99
 100 static struct format *fmt;
 101
 102 static int ncomps = 0;  /* # of interesting components */
 103 static char **compbuffers = NULL;  /* buffers for component text */
 104 static struct comp **used_buf = NULL;  /* stack for comp that use buffers */
 105
 106 static int dat[5];  /* aux. data for format routine */
 107
 108 static char *addrcomps[] = {
 109         "from",
 110         "sender",
 111         "reply-to",
 112         "to",
 113         "cc",
 114         "bcc",
 115         "resent-from",
 116         "resent-sender",
 117         "resent-reply-to",
 118         "resent-to",
 119         "resent-cc",
 120         "resent-bcc",
 121         NULL
 122 };
 123
 124 /*
 125 ** static prototypes
 126 */
 127 static void docc(char *, int);
 128 static int insert(struct mailname *);
 129 static void replfilter(FILE *, FILE *, char *);
 130 static void replout(FILE *, char *, struct msgs *, int,
 131                 char *, char *);
 132
 133
 134 int
 135 main(int argc, char **argv)
 136 {
 137         int anot = 0;
 138         char *cp, *cwd, *maildir, *file = NULL;
 139         char *folder = NULL, *msg = NULL;
 140         char *ed = NULL, drft[BUFSIZ], buf[BUFSIZ];
 141         char **argp, **arguments;
 142         struct msgs *mp = NULL;
 143         FILE *in;
 144
 145 #ifdef MHE
 146         int buildsw = 0;
 147 #endif /* MHE */
 148
 149         filter = getcpy(etcpath(mhlreply));
 150
 151 #ifdef LOCALE
 152         setlocale(LC_ALL, "");
 153 #endif
 154         invo_name = mhbasename(argv[0]);
 155
 156         /* read user profile/context */
 157         context_read();
 158
 159         arguments = getarguments(invo_name, argc, argv, 1);
 160         argp = arguments;
 161
 162         while ((cp = *argp++)) {
 163                 if (*cp == '-') {
 164                         switch (smatch(++cp, switches)) {
 165                         case AMBIGSW:
 166                                 ambigsw(cp, switches);
 167                                 done(1);
 168                         case UNKWNSW:
 169                                 adios(NULL, "-%s unknown", cp);
 170
 171                         case HELPSW:
 172                                 snprintf(buf, sizeof(buf), "%s: [+folder] [msg] [switches]", invo_name);
 173                                 print_help(buf, switches, 1);
 174                                 done(0);
 175                         case VERSIONSW:
 176                                 print_version(invo_name);
 177                                 done(1);
 178
 179                         case GROUPSW:
 180                                 groupreply++;
 181                                 continue;
 182                         case NGROUPSW:
 183                                 groupreply = 0;
 184                                 continue;
 185
 186                         case ANNOSW:
 187                                 anot++;
 188                                 continue;
 189                         case NANNOSW:
 190                                 anot = 0;
 191                                 continue;
 192
 193                         case CCSW:
 194                                 if (!(cp = *argp++) || *cp == '-')
 195                                         adios(NULL, "missing argument to %s",
 196                                                         argp[-2]);
 197                                 docc(cp, 1);
 198                                 continue;
 199                         case NCCSW:
 200                                 if (!(cp = *argp++) || *cp == '-')
 201                                         adios(NULL, "missing argument to %s",
 202                                                         argp[-2]);
 203                                 docc(cp, 0);
 204                                 continue;
 205
 206                         case EDITRSW:
 207                                 if (!(ed = *argp++) || *ed == '-')
 208                                         adios(NULL, "missing argument to %s",
 209                                                         argp[-2]);
 210                                 continue;
 211
 212                         case WHATSW:
 213                                 if (!(whatnowproc = *argp++) ||
 214                                                 *whatnowproc == '-')
 215                                         adios(NULL, "missing argument to %s",
 216                                                         argp[-2]);
 217                                 continue;
 218 #ifdef MHE
 219                         case BILDSW:
 220                                 buildsw++;  /* fall... */
 221                                 continue;
 222 #endif /* MHE */
 223
 224                         case FILESW:
 225                                 if (file)
 226                                         adios(NULL, "only one file at a time!");
 227                                 if (!(cp = *argp++) || *cp == '-')
 228                                         adios(NULL, "missing argument to %s",
 229                                                         argp[-2]);
 230                                 file = getcpy(expanddir(cp));
 231                                 continue;
 232                         case FORMSW:
 233                                 if (!(form = *argp++) || *form == '-')
 234                                         adios(NULL, "missing argument to %s",
 235                                                         argp[-2]);
 236                                 continue;
 237
 238                         case FILTSW:
 239                                 if (!(cp = *argp++) || *cp == '-')
 240                                         adios(NULL, "missing argument to %s",
 241                                                         argp[-2]);
 242                                 filter = getcpy(etcpath(cp));
 243                                 continue;
 244                         case NFILTSW:
 245                                 filter = NULL;
 246                                 continue;
 247
 248                         case MIMESW:
 249                                 mime++;
 250                                 continue;
 251                         case NMIMESW:
 252                                 mime = 0;
 253                                 continue;
 254
 255                         case QURYSW:
 256                                 querysw++;
 257                                 continue;
 258                         case NQURYSW:
 259                                 querysw = 0;
 260                                 continue;
 261
 262                         }
 263                 }
 264                 if (*cp == '+' || *cp == '@') {
 265                         if (folder)
 266                                 adios(NULL, "only one folder at a time!");
 267                         else
 268                                 folder = getcpy(expandfol(cp));
 269                 } else {
 270                         if (msg)
 271                                 adios(NULL, "only one message at a time!");
 272                         else
 273                                 msg = cp;
 274                 }
 275         }
 276
 277         if (ccto == -1)
 278                 ccto = groupreply;
 279         if (cccc == -1)
 280                 cccc = groupreply;
 281         if (ccme == -1)
 282                 ccme = groupreply;
 283
 284         cwd = getcpy(pwd());
 285
 286         if (file && (msg || folder))
 287                 adios(NULL, "can't mix files and folders/msgs");
 288
 289 #ifdef MHE
 290         strncpy(drft, buildsw ? toabsdir("reply")
 291                 : m_draft(seq_beyond), sizeof(drft));
 292 #else
 293         strncpy(drft, m_draft(seq_beyond), sizeof(drft));
 294 #endif /* MHE */
 295
 296         if (file) {
 297                 /*
 298                 ** We are replying to a file.
 299                 */
 300                 anot = 0;  /* we don't want to annotate a file */
 301         } else {
 302                 /*
 303                 ** We are replying to a message.
 304                 */
 305                 if (!msg)
 306                         msg = seq_cur;
 307                 if (!folder)
 308                         folder = getcurfol();
 309                 maildir = toabsdir(folder);
 310
 311                 if (chdir(maildir) == NOTOK)
 312                         adios(maildir, "unable to change directory to");
 313
 314                 /* read folder and create message structure */
 315                 if (!(mp = folder_read(folder)))
 316                         adios(NULL, "unable to read folder %s", folder);
 317
 318                 /* check for empty folder */
 319                 if (mp->nummsg == 0)
 320                         adios(NULL, "no messages in %s", folder);
 321
 322                 /* parse the message range/sequence/name and set SELECTED */
 323                 if (!m_convert(mp, msg))
 324                         done(1);
 325                 seq_setprev(mp);  /* set the previous-sequence */
 326
 327                 if (mp->numsel > 1)
 328                         adios(NULL, "only one message at a time!");
 329
 330                 context_replace(curfolder, folder); /* update current folder */
 331                 seq_setcur(mp, mp->lowsel);  /* update current message  */
 332                 seq_save(mp);  /* synchronize sequences   */
 333                 context_save();  /* save the context file   */
 334         }
 335
 336         msg = file ? file : getcpy(m_name(mp->lowsel));
 337
 338         if ((in = fopen(msg, "r")) == NULL)
 339                 adios(msg, "unable to open");
 340
 341         /* find form (components) file */
 342         if (!form) {
 343                 if (groupreply)
 344                         form = etcpath(replgroupcomps);
 345                 else
 346                         form = etcpath(replcomps);
 347         }
 348
 349         replout(in, drft, mp, mime, form, filter);
 350         fclose(in);
 351
 352         if (buildsw)
 353                 done(0);
 354         what_now(ed, NOUSE, drft, msg, 0, mp, anot ? "Replied" : NULL, cwd);
 355         done(1);
 356         return 1;
 357 }
 358
 359 static void
 360 docc(char *cp, int ccflag)
 361 {
 362         switch (smatch(cp, ccswitches)) {
 363         case AMBIGSW:
 364                 ambigsw(cp, ccswitches);
 365                 done(1);
 366         case UNKWNSW:
 367                 adios(NULL, "-%scc %s unknown", ccflag ? "" : "no", cp);
 368
 369         case CTOSW:
 370                 ccto = ccflag;
 371                 break;
 372
 373         case CCCSW:
 374                 cccc = ccflag;
 375                 break;
 376
 377         case CMESW:
 378                 ccme = ccflag;
 379                 break;
 380
 381         case CALSW:
 382                 ccto = cccc = ccme = ccflag;
 383                 break;
 384         }
 385 }
 386
 387
 388
 389
 390 static void
 391 replout(FILE *inb, char *drft, struct msgs *mp,
 392         int mime, char *form, char *filter)
 393 {
 394         register int state, i;
 395         register struct comp *cptr;
 396         register char *tmpbuf;
 397         register char **nxtbuf;
 398         register char **ap;
 399         register struct comp **savecomp;
 400         int char_read = 0, format_len, mask;
 401         char name[NAMESZ], *scanl;
 402         unsigned char *cp;
 403         FILE *out;
 404
 405         mask = umask(~m_gmprot());
 406         if ((out = fopen(drft, "w")) == NULL)
 407                 adios(drft, "unable to create");
 408
 409         umask(mask);
 410
 411         /* get new format string */
 412         cp = new_fs(form, NULL);
 413         format_len = strlen(cp);
 414
 415         /* compile format string */
 416         ncomps = fmt_compile(cp, &fmt) + 1;
 417
 418         if (!(nxtbuf = compbuffers = (char **)
 419                         calloc((size_t) ncomps, sizeof(char *))))
 420                 adios(NULL, "unable to allocate component buffers");
 421         if (!(savecomp = used_buf = (struct comp **)
 422                         calloc((size_t) (ncomps+1), sizeof(struct comp *))))
 423                 adios(NULL, "unable to allocate component buffer stack");
 424         savecomp += ncomps + 1;
 425         *--savecomp = NULL;  /* point at zero'd end minus 1 */
 426
 427         for (i = ncomps; i--; )
 428                 *nxtbuf++ = mh_xmalloc(SBUFSIZ);
 429
 430         nxtbuf = compbuffers;  /* point at start */
 431         tmpbuf = *nxtbuf++;
 432
 433         for (ap = addrcomps; *ap; ap++) {
 434                 FINDCOMP(cptr, *ap);
 435                 if (cptr)
 436                         cptr->c_type |= CT_ADDR;
 437         }
 438
 439         /*
 440         ** ignore any components killed by command line switches
 441         */
 442         if (!ccto) {
 443                 FINDCOMP(cptr, "to");
 444                 if (cptr)
 445                         cptr->c_name = "";
 446         }
 447         if (!cccc) {
 448                 FINDCOMP(cptr, "cc");
 449                 if (cptr)
 450                         cptr->c_name = "";
 451         }
 452         if ((cp = getenv("USER"))) {
 453                 FINDCOMP(cptr, "user");
 454                 if (cptr)
 455                         cptr->c_text = getcpy(cp);
 456         }
 457         if (!ccme)
 458                 ismymbox(NULL);
 459
 460         /*
 461         ** pick any interesting stuff out of msg "inb"
 462         */
 463         for (state = FLD;;) {
 464                 state = m_getfld(state, name, tmpbuf, SBUFSIZ, inb);
 465                 switch (state) {
 466                 case FLD:
 467                 case FLDPLUS:
 468                         /*
 469                         ** if we're interested in this component, save
 470                         ** a pointer to the component text, then start
 471                         ** using our next free buffer as the component
 472                         ** temp buffer (buffer switching saves an extra
 473                         ** copy of the component text).
 474                         */
 475                         if ((cptr = wantcomp[CHASH(name)]))
 476                                 do {
 477                                         if (!mh_strcasecmp(name, cptr->c_name)) {
 478                                                 char_read += msg_count;
 479                                                 if (! cptr->c_text) {
 480                                                         i = strlen(cptr->c_text = tmpbuf) - 1;
 481                                                         if (tmpbuf[i] == '\n')
 482                                                                 tmpbuf[i] = '\0';
 483                                                         *--savecomp = cptr;
 484                                                         tmpbuf = *nxtbuf++;
 485                                                 } else {
 486                                                         i = strlen(cp = cptr->c_text) - 1;
 487                                                         if (cp[i] == '\n') {
 488                                                                 if (cptr->c_type & CT_ADDR) {
 489                                                                         cp[i] = '\0';
 490                                                                         cp = add(",\n\t", cp);
 491                                                                 } else {
 492                                                                         cp = add("\t", cp);
 493                                                                 }
 494                                                         }
 495                                                         cptr->c_text = add(tmpbuf, cp);
 496                                                 }
 497                                                 while (state == FLDPLUS) {
 498                                                         state = m_getfld(state, name, tmpbuf,
 499                                                                                           SBUFSIZ, inb);
 500                                                         cptr->c_text = add(tmpbuf, cptr->c_text);
 501                                                         char_read += msg_count;
 502                                                 }
 503                                                 break;
 504                                         }
 505                                 } while ((cptr = cptr->c_next));
 506
 507                         while (state == FLDPLUS)
 508                                 state = m_getfld(state, name, tmpbuf,
 509                                                 SBUFSIZ, inb);
 510                         break;
 511
 512                 case LENERR:
 513                 case FMTERR:
 514                 case BODY:
 515                 case FILEEOF:
 516                         goto finished;
 517
 518                 default:
 519                         adios(NULL, "m_getfld() returned %d", state);
 520                 }
 521         }
 522
 523         /*
 524         ** format and output the header lines.
 525         */
 526 finished:
 527
 528         /*
 529         ** if there's a "Subject" component, strip any "Re:"s off it
 530         */
 531         FINDCOMP(cptr, "subject")
 532         if (cptr && (cp = cptr->c_text)) {
 533                 register char *sp = cp;
 534
 535                 for (;;) {
 536                         while (isspace(*cp))
 537                                 cp++;
 538                         if(uprf(cp, "re:"))
 539                                 cp += 3;
 540                         else
 541                                 break;
 542                         sp = cp;
 543                 }
 544                 if (sp != cptr->c_text) {
 545                         cp = cptr->c_text;
 546                         cptr->c_text = getcpy(sp);
 547                         free(cp);
 548                 }
 549         }
 550         i = format_len + char_read + 256;
 551         scanl = mh_xmalloc((size_t) i + 2);
 552         dat[0] = 0;
 553         dat[1] = 0;
 554         dat[2] = 0;
 555         dat[3] = OUTPUTLINELEN;
 556         dat[4] = 0;
 557         fmt_scan(fmt, scanl, i, dat);
 558         fputs(scanl, out);
 559         if (badaddrs) {
 560                 fputs("\nrepl: bad addresses:\n", out);
 561                 fputs( badaddrs, out);
 562         }
 563
 564         /* Check if we should filter the message */
 565         if (filter) {
 566                 fflush(out);
 567                 if (ferror(out))
 568                         adios(drft, "error writing");
 569
 570                 replfilter(inb, out, filter);
 571         }
 572
 573         fflush(out);
 574         if (ferror(out))
 575                 adios(drft, "error writing");
 576         fclose(out);
 577
 578         if (mime && mp) {
 579                 /* add an attachment header */
 580                 char buffer[BUFSIZ];
 581
 582                 snprintf(buffer, sizeof buffer, "anno -append -nodate '%s' "
 583                                 "-comp '%s' -text '+%s %s'",
 584                                 drft,
 585                                 attach_hdr, mp->foldpath, m_name(mp->lowsel));
 586                 if (system(buffer) != 0) {
 587                         advise(NULL, "unable to add attachment header");
 588                 }
 589         }
 590
 591         /* return dynamically allocated buffers */
 592         free(scanl);
 593         for (nxtbuf = compbuffers, i = ncomps; (cptr = *savecomp++);
 594                         nxtbuf++, i--)
 595                 free(cptr->c_text);  /* if not nxtbuf, nxtbuf already freed */
 596         while ( i-- > 0)
 597                 free(*nxtbuf++);  /* free unused nxtbufs */
 598         free((char *) compbuffers);
 599         free((char *) used_buf);
 600 }
 601
 602 static char *buf;  /* our current working buffer */
 603 static char *bufend;  /* end of working buffer */
 604 static char *last_dst;  /* buf ptr at end of last call */
 605 static unsigned int bufsiz=0;  /* current size of buf */
 606
 607 #define BUFINCR 512  /* how much to expand buf when if fills */
 608
 609 #define CPY(s) { cp = (s); while ((*dst++ = *cp++)) ; --dst; }
 610
 611 /*
 612 ** check if there's enough room in buf for str.
 613 ** add more mem if needed
 614 */
 615 #define CHECKMEM(str) \
 616         if ((len = strlen(str)) >= bufend - dst) {\
 617                 int i = dst - buf;\
 618                 int n = last_dst - buf;\
 619                 bufsiz += ((dst + len - bufend) / BUFINCR + 1) * BUFINCR;\
 620                 buf = mh_xrealloc(buf, bufsiz);\
 621                 dst = buf + i;\
 622                 last_dst = buf + n;\
 623                 bufend = buf + bufsiz;\
 624         }
 625
 626
 627 /*
 628 ** fmt_scan will call this routine if the user includes the function
 629 ** "(formataddr {component})" in a format string.  "orig" is the
 630 ** original contents of the string register.  "str" is the address
 631 ** string to be formatted and concatenated onto orig.  This routine
 632 ** returns a pointer to the concatenated address string.
 633 **
 634 ** We try to not do a lot of malloc/copy/free's (which is why we
 635 ** don't call "getcpy") but still place no upper limit on the
 636 ** length of the result string.
 637 **
 638 ** This routine is an override for the equally named one in sbr/fmt_addr.c.
 639 ** Don't delete it!
 640 */
 641 char *
 642 formataddr(char *orig, char *str)
 643 {
 644         register int len;
 645         char baddr[BUFSIZ], error[BUFSIZ];
 646         register int isgroup;
 647         register char *dst;
 648         register char *cp;
 649         register char *sp;
 650         register struct mailname *mp = NULL;
 651
 652         /* if we don't have a buffer yet, get one */
 653         if (bufsiz == 0) {
 654                 buf = mh_xmalloc(BUFINCR);
 655                 last_dst = buf;  /* XXX */
 656                 bufsiz = BUFINCR - 6;  /* leave some slop */
 657                 bufend = buf + bufsiz;
 658         }
 659         /*
 660         ** If "orig" points to our buffer we can just pick up where we
 661         ** left off.  Otherwise we have to copy orig into our buffer.
 662         */
 663         if (orig == buf)
 664                 dst = last_dst;
 665         else if (!orig || !*orig) {
 666                 dst = buf;
 667                 *dst = '\0';
 668         } else {
 669                 dst = last_dst;  /* XXX */
 670                 CHECKMEM(orig);
 671                 CPY(orig);
 672         }
 673
 674         /* concatenate all the new addresses onto 'buf' */
 675         for (isgroup = 0; (cp = getname(str)); ) {
 676                 if ((mp = getm(cp, dfhost, dftype, AD_NAME, error)) == NULL) {
 677                         snprintf(baddr, sizeof(baddr), "\t%s -- %s\n",
 678                                         cp, error);
 679                         badaddrs = add(baddr, badaddrs);
 680                         continue;
 681                 }
 682                 if (isgroup && (mp->m_gname || !mp->m_ingrp)) {
 683                         *dst++ = ';';
 684                         isgroup = 0;
 685                 }
 686                 if (insert(mp)) {
 687                         /* if we get here we're going to add an address */
 688                         if (dst != buf) {
 689                                 *dst++ = ',';
 690                                 *dst++ = ' ';
 691                         }
 692                         if (mp->m_gname) {
 693                                 CHECKMEM(mp->m_gname);
 694                                 CPY(mp->m_gname);
 695                                 isgroup++;
 696                         }
 697                         sp = adrformat(mp);
 698                         CHECKMEM(sp);
 699                         CPY(sp);
 700                 }
 701         }
 702
 703         if (isgroup)
 704                 *dst++ = ';';
 705
 706         *dst = '\0';
 707         last_dst = dst;
 708         return (buf);
 709 }
 710
 711
 712 static int
 713 insert(struct mailname *np)
 714 {
 715         char buffer[BUFSIZ];
 716         register struct mailname *mp;
 717
 718         if (np->m_mbox == NULL)
 719                 return 0;
 720
 721         for (mp = &mq; mp->m_next; mp = mp->m_next) {
 722                 if (!mh_strcasecmp(np->m_host, mp->m_next->m_host) &&
 723                                 !mh_strcasecmp(np->m_mbox, mp->m_next->m_mbox))
 724                         return 0;
 725         }
 726         if (!ccme && ismymbox(np))
 727                 return 0;
 728
 729         if (querysw) {
 730                 snprintf(buffer, sizeof(buffer), "Reply to %s? ",
 731                                 adrformat(np));
 732                 if (!gans(buffer, anoyes))
 733                         return 0;
 734         }
 735         mp->m_next = np;
 736         return 1;
 737 }
 738
 739
 740 /*
 741 ** Call mhl
 742 **
 743 ** This function expects that argument out has been fflushed by the caller.
 744 */
 745 static void
 746 replfilter(FILE *in, FILE *out, char *filter)
 747 {
 748         int pid, n;
 749         char *errstr;
 750
 751         if (filter == NULL)
 752                 return;
 753
 754         if (access(filter, R_OK) == NOTOK)
 755                 adios(filter, "unable to read");
 756
 757         rewind(in);
 758         lseek(fileno(in), (off_t) 0, SEEK_SET);
 759
 760         switch (pid = fork()) {
 761         case NOTOK:
 762                 adios("fork", "unable to");
 763
 764         case OK:
 765                 dup2(fileno(in), fileno(stdin));
 766                 dup2(fileno(out), fileno(stdout));
 767                 for (n=3; n<OPEN_MAX; n++) {
 768                         close(n);
 769                 }
 770
 771                 execlp("mhl", "mhl", "-form", filter, NULL);
 772                 errstr = strerror(errno);
 773                 write(2, "unable to exec mhl: ", 20);
 774                 write(2, errstr, strlen(errstr));
 775                 write(2, "\n", 1);
 776                 _exit(-1);
 777
 778         default:
 779                 if (pidXwait(pid, "mhl"))
 780                         done(1);
 781                 fseek(out, 0L, SEEK_END);
 782                 break;
 783         }
 784 }