folder.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Folder (mailbox) initialization, newmail announcement and related.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 - 2017 Steffen (Daode) Nurpmeso <steffen@sdaoden.eu>.
   6  */
   7 /*
   8  * Copyright (c) 1980, 1993
   9  *      The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #undef n_FILE
  36 #define n_FILE folder
  37
  38 #ifndef HAVE_AMALGAMATION
  39 # include "nail.h"
  40 #endif
  41
  42 #include <pwd.h>
  43
  44 /* Update mailname (if name != NULL) and displayname, return whether displayname
  45  * was large enough to swallow mailname */
  46 static bool_t  _update_mailname(char const *name);
  47 #ifdef HAVE_C90AMEND1 /* TODO unite __narrow_suffix() into one fun! */
  48 SINLINE size_t __narrow_suffix(char const *cp, size_t cpl, size_t maxl);
  49 #endif
  50
  51 #ifdef HAVE_C90AMEND1
  52 SINLINE size_t
  53 __narrow_suffix(char const *cp, size_t cpl, size_t maxl)
  54 {
  55    int err;
  56    size_t i, ok;
  57    NYD_ENTER;
  58
  59    for (err = ok = i = 0; cpl > maxl || err;) {
  60       int ml = mblen(cp, cpl);
  61       if (ml < 0) { /* XXX _narrow_suffix(): mblen() error; action? */
  62          (void)mblen(NULL, 0);
  63          err = 1;
  64          ml = 1;
  65       } else {
  66          if (!err)
  67             ok = i;
  68          err = 0;
  69          if (ml == 0)
  70             break;
  71       }
  72       cp += ml;
  73       i += ml;
  74       cpl -= ml;
  75    }
  76    NYD_LEAVE;
  77    return ok;
  78 }
  79 #endif /* HAVE_C90AMEND1 */
  80
  81 static bool_t
  82 _update_mailname(char const *name)
  83 {
  84    char *mailp, *dispp;
  85    size_t i, j;
  86    bool_t rv = TRU1;
  87    NYD_ENTER;
  88
  89    /* Don't realpath(3) if it's only an update request */
  90    if (name != NULL) {
  91 #ifdef HAVE_REALPATH
  92       enum protocol p = which_protocol(name);
  93
  94       if (p == PROTO_FILE || p == PROTO_MAILDIR) {
  95          if (realpath(name, mailname) == NULL && errno != ENOENT) {
  96             n_err(_("Can't canonicalize %s\n"), n_shexp_quote_cp(name, FAL0));
  97             rv = FAL0;
  98             goto jdocopy;
  99          }
 100       } else
 101 jdocopy:
 102 #endif
 103          n_strscpy(mailname, name, sizeof(mailname));
 104    }
 105
 106    mailp = mailname;
 107    dispp = displayname;
 108
 109    /* Don't display an absolute path but "+FOLDER" if under *folder* */
 110    /* C99 */{
 111       char const *folderp;
 112
 113       if(*(folderp = folder_query()) != '\0'){
 114          i = strlen(folderp);
 115          if(!strncmp(folderp, mailp, i)){
 116             mailp += i;
 117             *dispp++ = '+';
 118          }
 119       }
 120    }
 121
 122    /* We want to see the name of the folder .. on the screen */
 123    i = strlen(mailp);
 124    if (i < sizeof(displayname) -1)
 125       memcpy(dispp, mailp, i +1);
 126    else {
 127       rv = FAL0;
 128       /* Avoid disrupting multibyte sequences (if possible) */
 129 #ifndef HAVE_C90AMEND1
 130       j = sizeof(displayname) / 3 - 1;
 131       i -= sizeof(displayname) - (1/* + */ + 3) - j;
 132 #else
 133       j = field_detect_clip(sizeof(displayname) / 3, mailp, i);
 134       i = j + __narrow_suffix(mailp + j, i - j,
 135          sizeof(displayname) - (1/* + */ + 3 + 1) - j);
 136 #endif
 137       snprintf(dispp, sizeof(displayname), "%.*s...%s",
 138          (int)j, mailp, mailp + i);
 139    }
 140
 141    /* C99 */{
 142       bool_t reset = !(pstate & PS_ROOT);
 143
 144       pstate |= PS_ROOT;
 145       ok_vset(_mailbox_resolved, mailname);
 146       ok_vset(_mailbox_display, displayname);
 147       if(reset)
 148          pstate &= ~PS_ROOT;
 149    }
 150    NYD_LEAVE;
 151    return rv;
 152 }
 153
 154 FL int
 155 setfile(char const *name, enum fedit_mode fm) /* TODO oh my god */
 156 {
 157    static int shudclob;
 158
 159    struct stat stb;
 160    size_t offset;
 161    char const *who;
 162    int rv, omsgCount = 0;
 163    FILE *ibuf = NULL, *lckfp = NULL;
 164    bool_t isdevnull = FAL0;
 165    NYD_ENTER;
 166
 167    pstate &= ~PS_SETFILE_OPENED;
 168
 169    /* C99 */{
 170       enum fexp_mode fexpm;
 171
 172       if((who = shortcut_expand(name)) != NULL){
 173          fexpm = FEXP_NSHORTCUT | FEXP_NSHELL;
 174          name = who;
 175       }else
 176          fexpm = FEXP_NSHELL;
 177
 178       if(name[0] == '%'){
 179          fm |= FEDIT_SYSBOX; /* TODO fexpand() needs to tell is-valid-user! */
 180          if(*(who = &name[1]) == ':')
 181             ++who;
 182          if(*who == '\0')
 183             goto jlogname;
 184       }else
 185 jlogname:
 186          who = ok_vlook(LOGNAME);
 187
 188       if ((name = fexpand(name, fexpm)) == NULL)
 189          goto jem1;
 190    }
 191
 192    /* For at least substdate() users */
 193    time_current_update(&time_current, FAL0);
 194
 195    switch (which_protocol(name)) {
 196    case PROTO_FILE:
 197       if (temporary_protocol_ext != NULL)
 198          name = savecat(name, temporary_protocol_ext);
 199       isdevnull = ((options & OPT_BATCH_FLAG) && !strcmp(name, "/dev/null"));
 200 #ifdef HAVE_REALPATH
 201       do { /* TODO we need objects, goes away then */
 202 # ifdef HAVE_REALPATH_NULL
 203          char *cp;
 204
 205          if ((cp = realpath(name, NULL)) != NULL) {
 206             name = savestr(cp);
 207             (free)(cp);
 208          }
 209 # else
 210          char cbuf[PATH_MAX];
 211
 212          if (realpath(name, cbuf) != NULL)
 213             name = savestr(cbuf);
 214 # endif
 215       } while (0);
 216 #endif
 217       rv = 1;
 218       break;
 219    case PROTO_MAILDIR:
 220       shudclob = 1;
 221       rv = maildir_setfile(name, fm);
 222       goto jleave;
 223 #ifdef HAVE_POP3
 224    case PROTO_POP3:
 225       shudclob = 1;
 226       rv = pop3_setfile(name, fm);
 227       goto jleave;
 228 #endif
 229    default:
 230       n_err(_("Cannot handle protocol: %s\n"), name);
 231       goto jem1;
 232    }
 233
 234    if ((ibuf = Zopen(name, "r")) == NULL) {
 235       int e = errno;
 236
 237       if ((fm & FEDIT_SYSBOX) && e == ENOENT) {
 238          if (strcmp(who, ok_vlook(LOGNAME)) && getpwnam(who) == NULL) {
 239             n_err(_("%s is not a user of this system\n"),
 240                n_shexp_quote_cp(who, FAL0));
 241             goto jem2;
 242          }
 243          if (!(options & OPT_QUICKRUN_MASK) && ok_blook(bsdcompat))
 244             n_err(_("No mail for %s\n"), who);
 245       }
 246       if (fm & FEDIT_NEWMAIL)
 247          goto jleave;
 248
 249       mb.mb_type = MB_VOID;
 250       if (ok_blook(emptystart)) {
 251          if (!(options & OPT_QUICKRUN_MASK) && !ok_blook(bsdcompat))
 252             n_perr(name, e);
 253          /* We must avoid returning -1 and causing program exit */
 254          rv = 1;
 255          goto jleave;
 256       }
 257       n_perr(name, e);
 258       goto jem1;
 259    }
 260
 261    if (fstat(fileno(ibuf), &stb) == -1) {
 262       if (fm & FEDIT_NEWMAIL)
 263          goto jleave;
 264       n_perr(_("fstat"), 0);
 265       goto jem1;
 266    }
 267
 268    if (S_ISREG(stb.st_mode) || isdevnull) {
 269       /* EMPTY */
 270    } else {
 271       if (fm & FEDIT_NEWMAIL)
 272          goto jleave;
 273       errno = S_ISDIR(stb.st_mode) ? EISDIR : EINVAL;
 274       n_perr(name, 0);
 275       goto jem1;
 276    }
 277
 278    if (shudclob && !(fm & FEDIT_NEWMAIL) && !quit(FAL0))
 279       goto jem2;
 280
 281    hold_sigs();
 282
 283 #ifdef HAVE_SOCKETS
 284    if (!(fm & FEDIT_NEWMAIL) && mb.mb_sock.s_fd >= 0)
 285       sclose(&mb.mb_sock); /* TODO sorry? VMAILFS->close(), thank you */
 286 #endif
 287
 288    /* TODO There is no intermediate VOID box we've switched to: name may
 289     * TODO point to the same box that we just have written, so any updates
 290     * TODO we won't see!  Reopen again in this case.  RACY! Goes with VOID! */
 291    /* TODO In addition: in case of compressed/hook boxes we lock a temporary! */
 292    /* TODO We may uselessly open twice but quit() doesn't say whether we were
 293     * TODO modified so we can't tell: Mailbox::is_modified() :-(( */
 294    if (/*shudclob && !(fm & FEDIT_NEWMAIL) &&*/ !strcmp(name, mailname)) {
 295       name = mailname;
 296       Fclose(ibuf);
 297
 298       if ((ibuf = Zopen(name, "r")) == NULL ||
 299             fstat(fileno(ibuf), &stb) == -1 ||
 300             (!S_ISREG(stb.st_mode) && !isdevnull)) {
 301          n_perr(name, 0);
 302          rele_sigs();
 303          goto jem2;
 304       }
 305    }
 306
 307    /* Copy the messages into /tmp and set pointers */
 308    if (!(fm & FEDIT_NEWMAIL)) {
 309       if (isdevnull) {
 310          mb.mb_type = MB_VOID;
 311          mb.mb_perm = 0;
 312       } else {
 313          mb.mb_type = MB_FILE;
 314          mb.mb_perm = (((options & OPT_R_FLAG) || (fm & FEDIT_RDONLY) ||
 315                access(name, W_OK) < 0) ? 0 : MB_DELE | MB_EDIT);
 316          if (shudclob) {
 317             if (mb.mb_itf) {
 318                fclose(mb.mb_itf);
 319                mb.mb_itf = NULL;
 320             }
 321             if (mb.mb_otf) {
 322                fclose(mb.mb_otf);
 323                mb.mb_otf = NULL;
 324             }
 325          }
 326       }
 327       shudclob = 1;
 328       if (fm & FEDIT_SYSBOX)
 329          pstate &= ~PS_EDIT;
 330       else
 331          pstate |= PS_EDIT;
 332       initbox(name);
 333       offset = 0;
 334    } else {
 335       fseek(mb.mb_otf, 0L, SEEK_END);
 336       /* TODO Doing this without holding a lock is.. And not err checking.. */
 337       fseek(ibuf, mailsize, SEEK_SET);
 338       offset = mailsize;
 339       omsgCount = msgCount;
 340    }
 341
 342    if (isdevnull)
 343       lckfp = (FILE*)-1;
 344    else if (!(pstate & PS_EDIT))
 345       lckfp = n_dotlock(name, fileno(ibuf), FLT_READ, offset,0,
 346             (fm & FEDIT_NEWMAIL ? 0 : UIZ_MAX));
 347    else if (n_file_lock(fileno(ibuf), FLT_READ, offset,0,
 348          (fm & FEDIT_NEWMAIL ? 0 : UIZ_MAX)))
 349       lckfp = (FILE*)-1;
 350
 351    if (lckfp == NULL) {
 352       if (!(fm & FEDIT_NEWMAIL)) {
 353          char const *emsg = (pstate & PS_EDIT)
 354                ? N_("Unable to lock mailbox, aborting operation")
 355                : N_("Unable to (dot) lock mailbox, aborting operation");
 356          n_perr(V_(emsg), 0);
 357       }
 358       rele_sigs();
 359       if (!(fm & FEDIT_NEWMAIL))
 360          goto jem1;
 361       goto jleave;
 362    }
 363
 364    mailsize = fsize(ibuf);
 365
 366    /* TODO This is too simple minded?  We should regenerate an index file
 367     * TODO to be able to truly tell whether *anything* has changed! */
 368    if ((fm & FEDIT_NEWMAIL) && UICMP(z, mailsize, <=, offset)) {
 369       rele_sigs();
 370       goto jleave;
 371    }
 372    setptr(ibuf, offset);
 373    setmsize(msgCount);
 374    if ((fm & FEDIT_NEWMAIL) && mb.mb_sorted) {
 375       mb.mb_threaded = 0;
 376       c_sort((void*)-1);
 377    }
 378
 379    Fclose(ibuf);
 380    ibuf = NULL;
 381    if (lckfp != NULL && lckfp != (FILE*)-1) {
 382       Pclose(lckfp, FAL0);
 383       /*lckfp = NULL;*/
 384    }
 385
 386    if (!(fm & FEDIT_NEWMAIL)) {
 387       pstate &= ~PS_SAW_COMMAND;
 388       pstate |= PS_SETFILE_OPENED;
 389    }
 390
 391    rele_sigs();
 392
 393    if ((options & OPT_EXISTONLY) && !(options & OPT_HEADERLIST)) {
 394       rv = (msgCount == 0);
 395       goto jleave;
 396    }
 397
 398    if ((!(pstate & PS_EDIT) || (fm & FEDIT_NEWMAIL)) && msgCount == 0) {
 399       if (!(fm & FEDIT_NEWMAIL)) {
 400          if (!ok_blook(emptystart))
 401             n_err(_("No mail for %s\n"), who);
 402       }
 403       goto jleave;
 404    }
 405
 406    if (fm & FEDIT_NEWMAIL)
 407       newmailinfo(omsgCount);
 408
 409    rv = 0;
 410 jleave:
 411    if (ibuf != NULL) {
 412       Fclose(ibuf);
 413       if (lckfp != NULL && lckfp != (FILE*)-1)
 414          Pclose(lckfp, FAL0);
 415    }
 416    NYD_LEAVE;
 417    return rv;
 418 jem2:
 419    mb.mb_type = MB_VOID;
 420 jem1:
 421    rv = -1;
 422    goto jleave;
 423 }
 424
 425 FL int
 426 newmailinfo(int omsgCount)
 427 {
 428    int mdot, i;
 429    NYD_ENTER;
 430
 431    for (i = 0; i < omsgCount; ++i)
 432       message[i].m_flag &= ~MNEWEST;
 433
 434    if (msgCount > omsgCount) {
 435       for (i = omsgCount; i < msgCount; ++i)
 436          message[i].m_flag |= MNEWEST;
 437       printf(_("New mail has arrived.\n"));
 438       if ((i = msgCount - omsgCount) == 1)
 439          printf(_("Loaded 1 new message.\n"));
 440       else
 441          printf(_("Loaded %d new messages.\n"), i);
 442    } else
 443       printf(_("Loaded %d messages.\n"), msgCount);
 444
 445    check_folder_hook(TRU1);
 446
 447    mdot = getmdot(1);
 448
 449    if (ok_blook(header))
 450       print_headers(omsgCount + 1, msgCount, FAL0);
 451    NYD_LEAVE;
 452    return mdot;
 453 }
 454
 455 FL void
 456 setmsize(int sz)
 457 {
 458    NYD_ENTER;
 459    if (n_msgvec != NULL)
 460       free(n_msgvec);
 461    n_msgvec = scalloc(sz + 1, sizeof *n_msgvec);
 462    NYD_LEAVE;
 463 }
 464
 465 FL void
 466 print_header_summary(char const *Larg)
 467 {
 468    size_t bot, top, i, j;
 469    NYD_ENTER;
 470
 471    if (Larg != NULL) {
 472       /* Avoid any messages XXX add a make_mua_silent() and use it? */
 473       if ((options & (OPT_VERB | OPT_EXISTONLY)) == OPT_EXISTONLY) {
 474          freopen("/dev/null", "w", stdout);
 475          freopen("/dev/null", "w", stderr);
 476       }
 477       assert(n_msgvec != NULL);
 478       i = (getmsglist(/*TODO make const */n_UNCONST(Larg), n_msgvec, 0) <= 0);
 479       if (options & OPT_EXISTONLY) {
 480          exit_status = (int)i;
 481          goto jleave;
 482       }
 483       if (i)
 484          goto jleave;
 485       for (bot = msgCount, top = 0, i = 0; (j = n_msgvec[i]) != 0; ++i) {
 486          if (bot > j)
 487             bot = j;
 488          if (top < j)
 489             top = j;
 490       }
 491    } else
 492       bot = 1, top = msgCount;
 493    print_headers(bot, top, (Larg != NULL)); /* TODO should take iterator!! */
 494 jleave:
 495    NYD_LEAVE;
 496 }
 497
 498 FL void
 499 announce(int printheaders)
 500 {
 501    int vec[2], mdot;
 502    NYD_ENTER;
 503
 504    mdot = newfileinfo();
 505    vec[0] = mdot;
 506    vec[1] = 0;
 507    dot = message + mdot - 1;
 508    if (printheaders && msgCount > 0 && ok_blook(header)) {
 509       print_header_group(vec); /* XXX errors? */
 510    }
 511    NYD_LEAVE;
 512 }
 513
 514 FL int
 515 newfileinfo(void)
 516 {
 517    struct message *mp;
 518    int u, n, mdot, d, s, hidden, moved;
 519    NYD_ENTER;
 520
 521    if (mb.mb_type == MB_VOID) {
 522       mdot = 1;
 523       goto jleave;
 524    }
 525
 526    mdot = getmdot(0);
 527    s = d = hidden = moved =0;
 528    for (mp = message, n = 0, u = 0; PTRCMP(mp, <, message + msgCount); ++mp) {
 529       if (mp->m_flag & MNEW)
 530          ++n;
 531       if ((mp->m_flag & MREAD) == 0)
 532          ++u;
 533       if ((mp->m_flag & (MDELETED | MSAVED)) == (MDELETED | MSAVED))
 534          ++moved;
 535       if ((mp->m_flag & (MDELETED | MSAVED)) == MDELETED)
 536          ++d;
 537       if ((mp->m_flag & (MDELETED | MSAVED)) == MSAVED)
 538          ++s;
 539       if (mp->m_flag & MHIDDEN)
 540          ++hidden;
 541    }
 542
 543    /* If displayname gets truncated the user effectively has no option to see
 544     * the full pathname of the mailbox, so print it at least for '? fi' */
 545    printf(_("%s: "), n_shexp_quote_cp(
 546       (_update_mailname(NULL) ? displayname : mailname), FAL0));
 547    if (msgCount == 1)
 548       printf(_("1 message"));
 549    else
 550       printf(_("%d messages"), msgCount);
 551    if (n > 0)
 552       printf(_(" %d new"), n);
 553    if (u-n > 0)
 554       printf(_(" %d unread"), u);
 555    if (d > 0)
 556       printf(_(" %d deleted"), d);
 557    if (s > 0)
 558       printf(_(" %d saved"), s);
 559    if (moved > 0)
 560       printf(_(" %d moved"), moved);
 561    if (hidden > 0)
 562       printf(_(" %d hidden"), hidden);
 563    else if (mb.mb_perm == 0)
 564       printf(_(" [Read only]"));
 565    printf("\n");
 566 jleave:
 567    NYD_LEAVE;
 568    return mdot;
 569 }
 570
 571 FL int
 572 getmdot(int nmail)
 573 {
 574    struct message *mp;
 575    char *cp;
 576    int mdot;
 577    enum mflag avoid = MHIDDEN | MDELETED;
 578    NYD_ENTER;
 579
 580    if (!nmail) {
 581       if (ok_blook(autothread)) {
 582          OBSOLETE(_("please use *autosort=thread* instead of *autothread*"));
 583          c_thread(NULL);
 584       } else if ((cp = ok_vlook(autosort)) != NULL) {
 585          if (mb.mb_sorted != NULL)
 586             free(mb.mb_sorted);
 587          mb.mb_sorted = sstrdup(cp);
 588          c_sort(NULL);
 589       }
 590    }
 591    if (mb.mb_type == MB_VOID) {
 592       mdot = 1;
 593       goto jleave;
 594    }
 595
 596    if (nmail)
 597       for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 598          if ((mp->m_flag & (MNEWEST | avoid)) == MNEWEST)
 599             break;
 600
 601    if (!nmail || PTRCMP(mp, >=, message + msgCount)) {
 602       if (mb.mb_threaded) {
 603          for (mp = threadroot; mp != NULL; mp = next_in_thread(mp))
 604             if ((mp->m_flag & (MNEW | avoid)) == MNEW)
 605                break;
 606       } else {
 607          for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 608             if ((mp->m_flag & (MNEW | avoid)) == MNEW)
 609                break;
 610       }
 611    }
 612
 613    if ((mb.mb_threaded ? (mp == NULL) : PTRCMP(mp, >=, message + msgCount))) {
 614       if (mb.mb_threaded) {
 615          for (mp = threadroot; mp != NULL; mp = next_in_thread(mp))
 616             if (mp->m_flag & MFLAGGED)
 617                break;
 618       } else {
 619          for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 620             if (mp->m_flag & MFLAGGED)
 621                break;
 622       }
 623    }
 624
 625    if ((mb.mb_threaded ? (mp == NULL) : PTRCMP(mp, >=, message + msgCount))) {
 626       if (mb.mb_threaded) {
 627          for (mp = threadroot; mp != NULL; mp = next_in_thread(mp))
 628             if (!(mp->m_flag & (MREAD | avoid)))
 629                break;
 630       } else {
 631          for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 632             if (!(mp->m_flag & (MREAD | avoid)))
 633                break;
 634       }
 635    }
 636
 637    if (nmail &&
 638          (mb.mb_threaded ? (mp != NULL) : PTRCMP(mp, <, message + msgCount)))
 639       mdot = (int)PTR2SIZE(mp - message + 1);
 640    else if (ok_blook(showlast)) {
 641       if (mb.mb_threaded) {
 642          for (mp = this_in_thread(threadroot, -1); mp;
 643                mp = prev_in_thread(mp))
 644             if (!(mp->m_flag & avoid))
 645                break;
 646          mdot = (mp != NULL) ? (int)PTR2SIZE(mp - message + 1) : msgCount;
 647       } else {
 648          for (mp = message + msgCount - 1; mp >= message; --mp)
 649             if (!(mp->m_flag & avoid))
 650                break;
 651          mdot = (mp >= message) ? (int)PTR2SIZE(mp - message + 1) : msgCount;
 652       }
 653    } else if (!nmail &&
 654          (mb.mb_threaded ? (mp != NULL) : PTRCMP(mp, <, message + msgCount)))
 655       mdot = (int)PTR2SIZE(mp - message + 1);
 656    else if (mb.mb_threaded) {
 657       for (mp = threadroot; mp; mp = next_in_thread(mp))
 658          if (!(mp->m_flag & avoid))
 659             break;
 660       mdot = (mp != NULL) ? (int)PTR2SIZE(mp - message + 1) : 1;
 661    } else {
 662       for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 663          if (!(mp->m_flag & avoid))
 664             break;
 665       mdot = PTRCMP(mp, <, message + msgCount)
 666             ? (int)PTR2SIZE(mp - message + 1) : 1;
 667    }
 668 jleave:
 669    NYD_LEAVE;
 670    return mdot;
 671 }
 672
 673 FL void
 674 initbox(char const *name)
 675 {
 676    char *tempMesg;
 677    NYD_ENTER;
 678
 679    if (mb.mb_type != MB_VOID)
 680       n_strscpy(prevfile, mailname, PATH_MAX);
 681
 682    /* TODO name always NE mailname (but goes away for objects anyway)
 683     * TODO Well, not true no more except that in parens */
 684    _update_mailname((name != mailname) ? name : NULL);
 685
 686    if ((mb.mb_otf = Ftmp(&tempMesg, "tmpmbox", OF_WRONLY | OF_HOLDSIGS)) ==
 687          NULL) {
 688       n_perr(_("temporary mail message file"), 0);
 689       exit(EXIT_ERR);
 690    }
 691    if ((mb.mb_itf = safe_fopen(tempMesg, "r", NULL)) == NULL) {
 692       n_perr(_("temporary mail message file"), 0);
 693       exit(EXIT_ERR);
 694    }
 695    Ftmp_release(&tempMesg);
 696
 697    message_reset();
 698    mb.mb_threaded = 0;
 699    if (mb.mb_sorted != NULL) {
 700       free(mb.mb_sorted);
 701       mb.mb_sorted = NULL;
 702    }
 703    dot = prevdot = threadroot = NULL;
 704    pstate &= ~PS_DID_PRINT_DOT;
 705    NYD_LEAVE;
 706 }
 707
 708 FL char const *
 709 folder_query(void){
 710    struct n_string s, *sp = &s;
 711    char *cp;
 712    char const *rv;
 713    bool_t err;
 714    NYD_ENTER;
 715
 716    sp = n_string_creat_auto(sp);
 717
 718    /* *folder* is linked with *_folder_resolved*: we only use the latter */
 719    for(err = FAL0;;){
 720       if((rv = ok_vlook(_folder_resolved)) != NULL)
 721          break;
 722
 723       /* POSIX says:
 724        *    If directory does not start with a <slash> ('/'), the contents
 725        *    of HOME shall be prefixed to it.
 726        * And:
 727        *    If folder is unset or set to null, [.] filenames beginning with
 728        *    '+' shall refer to files in the current directory.
 729        * We may have the result already */
 730       rv = n_empty;
 731       err = FAL0;
 732
 733       if((cp = ok_vlook(folder)) == NULL)
 734          goto jset;
 735
 736       /* Expand the *folder*; skip %: prefix for simplicity of use */
 737       if(cp[0] == '%' && cp[1] == ':')
 738          cp += 2;
 739       if((err = (cp = fexpand(cp, FEXP_NSPECIAL | FEXP_NFOLDER | FEXP_NSHELL)
 740             ) == NULL) || *cp == '\0')
 741          goto jset;
 742
 743       switch(which_protocol(cp)){
 744       case PROTO_POP3:
 745          n_err(_("*folder* can't be set to a flat, readonly POP3 account\n"));
 746          err = TRU1;
 747          goto jset;
 748       default:
 749          /* Further expansion desired */
 750          break;
 751       }
 752
 753       /* Prefix HOME as necessary */
 754       if(*cp != '/'){ /* XXX path_is_absolute() */
 755          size_t l1, l2;
 756          char const *home;
 757
 758          home = ok_vlook(HOME);
 759          l1 = strlen(home);
 760          l2 = strlen(cp);
 761
 762          sp = n_string_reserve(sp, l1 + 1 + l2 +1);
 763          sp = n_string_push_buf(sp, home, l1);
 764          sp = n_string_push_c(sp, '/');
 765          sp = n_string_push_buf(sp, cp, l2);
 766          cp = n_string_cp(sp);
 767          sp = n_string_drop_ownership(sp);
 768       }
 769
 770       rv = cp;
 771
 772       /* TODO Since our visual mailname is resolved via realpath(3) if available
 773        * TODO to avoid that we loose track of our currently open folder in case
 774        * TODO we chdir away, but still checks the leading path portion against
 775        * TODO folder_query() to be able to abbreviate to the +FOLDER syntax if
 776        * TODO possible, we need to realpath(3) the folder, too */
 777 #ifdef HAVE_REALPATH
 778       assert(sp->s_len == 0 && sp->s_dat == NULL);
 779 # ifndef HAVE_REALPATH_NULL
 780       sp = n_string_reserve(sp, PATH_MAX +1);
 781 # endif
 782
 783       if((sp->s_dat = realpath(cp, sp->s_dat)) != NULL){
 784 # ifdef HAVE_REALPATH_NULL
 785          n_string_cp(sp = n_string_assign_cp(sp, cp = sp->s_dat));
 786          (free)(cp);
 787 # endif
 788          rv = sp->s_dat;
 789       }else if(errno == ENOENT)
 790          rv = cp;
 791       else{
 792          n_err(_("Can't canonicalize *folder*: %s\n"),
 793             n_shexp_quote_cp(cp, FAL0));
 794          err = TRU1;
 795          rv = n_empty;
 796       }
 797       sp = n_string_drop_ownership(sp);
 798 #endif /* HAVE_REALPATH */
 799
 800       /* Always append a solidus to our result path upon success */
 801       if(!err){
 802          size_t i;
 803
 804          if(rv[(i = strlen(rv)) - 1] != '/'){
 805             sp = n_string_reserve(sp, i + 1 +1);
 806             sp = n_string_push_buf(sp, rv, i);
 807             sp = n_string_push_c(sp, '/');
 808             rv = n_string_cp(sp);
 809             sp = n_string_drop_ownership(sp);
 810          }
 811       }
 812
 813 jset:
 814       /* C99 */{
 815          bool_t reset = !(pstate & PS_ROOT);
 816
 817          pstate |= PS_ROOT;
 818          ok_vset(_folder_resolved, rv);
 819          if(reset)
 820             pstate &= ~PS_ROOT;
 821       }
 822    }
 823
 824    if(err){
 825       n_err(_("*folder* is not resolvable, using CWD\n"));
 826       assert(rv != NULL && *rv == '\0');
 827    }
 828    NYD_LEAVE;
 829    return rv;
 830 }
 831
 832 /* s-it-mode */