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 - 2016 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_shell_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             if(folderp[i -1] != '/' && mailp[i] == '/') /* XXX DIRSEP magic */
 117                ++i;
 118             mailp += i;
 119             *dispp++ = '+';
 120          }
 121       }
 122    }
 123
 124    /* We want to see the name of the folder .. on the screen */
 125    i = strlen(mailp);
 126    if (i < sizeof(displayname) -1)
 127       memcpy(dispp, mailp, i +1);
 128    else {
 129       rv = FAL0;
 130       /* Avoid disrupting multibyte sequences (if possible) */
 131 #ifndef HAVE_C90AMEND1
 132       j = sizeof(displayname) / 3 - 1;
 133       i -= sizeof(displayname) - (1/* + */ + 3) - j;
 134 #else
 135       j = field_detect_clip(sizeof(displayname) / 3, mailp, i);
 136       i = j + __narrow_suffix(mailp + j, i - j,
 137          sizeof(displayname) - (1/* + */ + 3 + 1) - j);
 138 #endif
 139       snprintf(dispp, sizeof(displayname), "%.*s...%s",
 140          (int)j, mailp, mailp + i);
 141    }
 142    NYD_LEAVE;
 143    return rv;
 144 }
 145
 146 FL int
 147 setfile(char const *name, enum fedit_mode fm) /* TODO oh my god */
 148 {
 149    /* Note we don't 'userid(myname) != getuid()', preliminary steps are usually
 150     * necessary to make a mailbox accessible by a different user, and if that
 151     * has happened, let's just let the usual file perms decide */
 152    static int shudclob;
 153
 154    struct stat stb;
 155    size_t offset;
 156    char const *who;
 157    int rv, omsgCount = 0;
 158    FILE *ibuf = NULL, *lckfp = NULL;
 159    bool_t isdevnull = FAL0;
 160    NYD_ENTER;
 161
 162    pstate &= ~PS_SETFILE_OPENED;
 163
 164    /* C99 */{
 165       enum fexp_mode fexpm;
 166
 167       if((who = shortcut_expand(name)) != NULL){
 168          fexpm = FEXP_NSHORTCUT | FEXP_NSHELL;
 169          name = who;
 170       }else
 171          fexpm = FEXP_NSHELL;
 172
 173       if(name[0] == '%'){
 174          fm |= FEDIT_SYSBOX; /* TODO fexpand() needs to tell is-valid-user! */
 175          if(*(who = &name[1]) == ':')
 176             ++who;
 177          if(*who == '\0')
 178             who = myname;
 179       }else
 180          who = myname;
 181
 182       if ((name = fexpand(name, fexpm)) == NULL)
 183          goto jem1;
 184    }
 185
 186    /* For at least substdate() users */
 187    time_current_update(&time_current, FAL0);
 188
 189    switch (which_protocol(name)) {
 190    case PROTO_FILE:
 191       if (temporary_protocol_ext != NULL)
 192          name = savecat(name, temporary_protocol_ext);
 193       isdevnull = ((options & OPT_BATCH_FLAG) && !strcmp(name, "/dev/null"));
 194 #ifdef HAVE_REALPATH
 195       do { /* TODO we need objects, goes away then */
 196 # ifdef HAVE_REALPATH_NULL
 197          char *cp;
 198
 199          if ((cp = realpath(name, NULL)) != NULL) {
 200             name = savestr(cp);
 201             (free)(cp);
 202          }
 203 # else
 204          char cbuf[PATH_MAX];
 205
 206          if (realpath(name, cbuf) != NULL)
 207             name = savestr(cbuf);
 208 # endif
 209       } while (0);
 210 #endif
 211       rv = 1;
 212       break;
 213    case PROTO_MAILDIR:
 214       shudclob = 1;
 215       rv = maildir_setfile(name, fm);
 216       goto jleave;
 217 #ifdef HAVE_POP3
 218    case PROTO_POP3:
 219       shudclob = 1;
 220       rv = pop3_setfile(name, fm);
 221       goto jleave;
 222 #endif
 223    default:
 224       n_err(_("Cannot handle protocol: %s\n"), name);
 225       goto jem1;
 226    }
 227
 228    if ((ibuf = Zopen(name, "r")) == NULL) {
 229       if ((fm & FEDIT_SYSBOX) && errno == ENOENT) {
 230          if (strcmp(who, myname) && getpwnam(who) == NULL) {
 231             n_err(_("%s is not a user of this system\n"),
 232                n_shell_quote_cp(who, FAL0));
 233             goto jem2;
 234          }
 235          if (!(options & OPT_QUICKRUN_MASK) && ok_blook(bsdcompat))
 236             n_err(_("No mail for %s\n"), who);
 237          if (fm & FEDIT_NEWMAIL)
 238             goto jleave;
 239          if (ok_blook(emptystart)) {
 240             if (!(options & OPT_QUICKRUN_MASK) && !ok_blook(bsdcompat))
 241                n_perr(name, 0);
 242             /* We must avoid returning -1 and causing program exit */
 243             mb.mb_type = MB_VOID;
 244             rv = 1;
 245             goto jleave;
 246          }
 247          goto jem2;
 248       } else if (fm & FEDIT_NEWMAIL)
 249          goto jleave;
 250       n_perr(name, 0);
 251       goto jem1;
 252    }
 253
 254    if (fstat(fileno(ibuf), &stb) == -1) {
 255       if (fm & FEDIT_NEWMAIL)
 256          goto jleave;
 257       n_perr(_("fstat"), 0);
 258       goto jem1;
 259    }
 260
 261    if (S_ISREG(stb.st_mode) || isdevnull) {
 262       /* EMPTY */
 263    } else {
 264       if (fm & FEDIT_NEWMAIL)
 265          goto jleave;
 266       errno = S_ISDIR(stb.st_mode) ? EISDIR : EINVAL;
 267       n_perr(name, 0);
 268       goto jem1;
 269    }
 270
 271    /* Looks like all will be well.  We must now relinquish our hold on the
 272     * current set of stuff.  Must hold signals while we are reading the new
 273     * file, else we will ruin the message[] data structure */
 274
 275    hold_sigs(); /* TODO note on this one in quit.c:quit() */
 276    if (shudclob && !(fm & FEDIT_NEWMAIL) && !quit()) {
 277       rele_sigs();
 278       goto jem2;
 279    }
 280
 281 #ifdef HAVE_SOCKETS
 282    if (!(fm & FEDIT_NEWMAIL) && mb.mb_sock.s_fd >= 0)
 283       sclose(&mb.mb_sock); /* TODO sorry? VMAILFS->close(), thank you */
 284 #endif
 285
 286    /* TODO There is no intermediate VOID box we've switched to: name may
 287     * TODO point to the same box that we just have written, so any updates
 288     * TODO we won't see!  Reopen again in this case.  RACY! Goes with VOID! */
 289    /* TODO In addition: in case of compressed/hook boxes we lock a temporary! */
 290    /* TODO We may uselessly open twice but quit() doesn't say whether we were
 291     * TODO modified so we can't tell: Mailbox::is_modified() :-(( */
 292    if (/*shudclob && !(fm & FEDIT_NEWMAIL) &&*/ !strcmp(name, mailname)) {
 293       name = mailname;
 294       Fclose(ibuf);
 295
 296       if ((ibuf = Zopen(name, "r")) == NULL ||
 297             fstat(fileno(ibuf), &stb) == -1 ||
 298             (!S_ISREG(stb.st_mode) && !isdevnull)) {
 299          n_perr(name, 0);
 300          rele_sigs();
 301          goto jem2;
 302       }
 303    }
 304
 305    /* Copy the messages into /tmp and set pointers */
 306    if (!(fm & FEDIT_NEWMAIL)) {
 307       if (isdevnull) {
 308          mb.mb_type = MB_VOID;
 309          mb.mb_perm = 0;
 310       } else {
 311          mb.mb_type = MB_FILE;
 312          mb.mb_perm = (((options & OPT_R_FLAG) || (fm & FEDIT_RDONLY) ||
 313                access(name, W_OK) < 0) ? 0 : MB_DELE | MB_EDIT);
 314          if (shudclob) {
 315             if (mb.mb_itf) {
 316                fclose(mb.mb_itf);
 317                mb.mb_itf = NULL;
 318             }
 319             if (mb.mb_otf) {
 320                fclose(mb.mb_otf);
 321                mb.mb_otf = NULL;
 322             }
 323          }
 324       }
 325       shudclob = 1;
 326       if (fm & FEDIT_SYSBOX)
 327          pstate &= ~PS_EDIT;
 328       else
 329          pstate |= PS_EDIT;
 330       initbox(name);
 331       offset = 0;
 332    } else {
 333       fseek(mb.mb_otf, 0L, SEEK_END);
 334       /* TODO Doing this without holding a lock is.. And not err checking.. */
 335       fseek(ibuf, mailsize, SEEK_SET);
 336       offset = mailsize;
 337       omsgCount = msgCount;
 338    }
 339
 340    if (isdevnull)
 341       lckfp = (FILE*)-1;
 342    else if (!(pstate & PS_EDIT))
 343       lckfp = n_dotlock(name, fileno(ibuf), FLT_READ, offset,0,
 344             (fm & FEDIT_NEWMAIL ? 0 : UIZ_MAX));
 345    else if (n_file_lock(fileno(ibuf), FLT_READ, offset,0,
 346          (fm & FEDIT_NEWMAIL ? 0 : UIZ_MAX)))
 347       lckfp = (FILE*)-1;
 348
 349    if (lckfp == NULL) {
 350       if (!(fm & FEDIT_NEWMAIL)) {
 351          char const *emsg = (pstate & PS_EDIT)
 352                ? N_("Unable to lock mailbox, aborting operation")
 353                : N_("Unable to (dot) lock mailbox, aborting operation");
 354          n_perr(V_(emsg), 0);
 355       }
 356       rele_sigs();
 357       if (!(fm & FEDIT_NEWMAIL))
 358          goto jem1;
 359       goto jleave;
 360    }
 361
 362    mailsize = fsize(ibuf);
 363
 364    /* TODO This is too simple minded?  We should regenerate an index file
 365     * TODO to be able to truly tell whether *anything* has changed! */
 366    if ((fm & FEDIT_NEWMAIL) && UICMP(z, mailsize, <=, offset)) {
 367       rele_sigs();
 368       goto jleave;
 369    }
 370    setptr(ibuf, offset);
 371    setmsize(msgCount);
 372    if ((fm & FEDIT_NEWMAIL) && mb.mb_sorted) {
 373       mb.mb_threaded = 0;
 374       c_sort((void*)-1);
 375    }
 376
 377    Fclose(ibuf);
 378    ibuf = NULL;
 379    if (lckfp != NULL && lckfp != (FILE*)-1) {
 380       Pclose(lckfp, FAL0);
 381       /*lckfp = NULL;*/
 382    }
 383    rele_sigs();
 384
 385    if (!(fm & FEDIT_NEWMAIL)) {
 386       pstate &= ~PS_SAW_COMMAND;
 387       pstate |= PS_SETFILE_OPENED;
 388    }
 389
 390    if ((options & OPT_EXISTONLY) && !(options & OPT_HEADERLIST)) {
 391       rv = (msgCount == 0);
 392       goto jleave;
 393    }
 394
 395    if ((!(pstate & PS_EDIT) || (fm & FEDIT_NEWMAIL)) && msgCount == 0) {
 396       if (!(fm & FEDIT_NEWMAIL)) {
 397          if (!ok_blook(emptystart))
 398             n_err(_("No mail for %s\n"), who);
 399       }
 400       goto jleave;
 401    }
 402
 403    if (fm & FEDIT_NEWMAIL)
 404       newmailinfo(omsgCount);
 405
 406    rv = 0;
 407 jleave:
 408    if (ibuf != NULL) {
 409       Fclose(ibuf);
 410       if (lckfp != NULL && lckfp != (FILE*)-1)
 411          Pclose(lckfp, FAL0);
 412    }
 413    NYD_LEAVE;
 414    return rv;
 415 jem2:
 416    mb.mb_type = MB_VOID;
 417 jem1:
 418    rv = -1;
 419    goto jleave;
 420 }
 421
 422 FL int
 423 newmailinfo(int omsgCount)
 424 {
 425    int mdot, i;
 426    NYD_ENTER;
 427
 428    for (i = 0; i < omsgCount; ++i)
 429       message[i].m_flag &= ~MNEWEST;
 430
 431    if (msgCount > omsgCount) {
 432       for (i = omsgCount; i < msgCount; ++i)
 433          message[i].m_flag |= MNEWEST;
 434       printf(_("New mail has arrived.\n"));
 435       if ((i = msgCount - omsgCount) == 1)
 436          printf(_("Loaded 1 new message.\n"));
 437       else
 438          printf(_("Loaded %d new messages.\n"), i);
 439    } else
 440       printf(_("Loaded %d messages.\n"), msgCount);
 441
 442    check_folder_hook(TRU1);
 443
 444    mdot = getmdot(1);
 445
 446    if (ok_blook(header))
 447       print_headers(omsgCount + 1, msgCount, FAL0);
 448    NYD_LEAVE;
 449    return mdot;
 450 }
 451
 452 FL void
 453 setmsize(int sz)
 454 {
 455    NYD_ENTER;
 456    if (n_msgvec != NULL)
 457       free(n_msgvec);
 458    n_msgvec = scalloc(sz + 1, sizeof *n_msgvec);
 459    NYD_LEAVE;
 460 }
 461
 462 FL void
 463 print_header_summary(char const *Larg)
 464 {
 465    size_t bot, top, i, j;
 466    NYD_ENTER;
 467
 468    if (Larg != NULL) {
 469       /* Avoid any messages XXX add a make_mua_silent() and use it? */
 470       if ((options & (OPT_VERB | OPT_EXISTONLY)) == OPT_EXISTONLY) {
 471          freopen("/dev/null", "w", stdout);
 472          freopen("/dev/null", "w", stderr);
 473       }
 474       assert(n_msgvec != NULL);
 475       i = (getmsglist(/*TODO make arg const */UNCONST(Larg), n_msgvec, 0) <= 0);
 476       if (options & OPT_EXISTONLY) {
 477          exit_status = (int)i;
 478          goto jleave;
 479       }
 480       if (i)
 481          goto jleave;
 482       for (bot = msgCount, top = 0, i = 0; (j = n_msgvec[i]) != 0; ++i) {
 483          if (bot > j)
 484             bot = j;
 485          if (top < j)
 486             top = j;
 487       }
 488    } else
 489       bot = 1, top = msgCount;
 490    print_headers(bot, top, (Larg != NULL)); /* TODO should take iterator!! */
 491 jleave:
 492    NYD_LEAVE;
 493 }
 494
 495 FL void
 496 announce(int printheaders)
 497 {
 498    int vec[2], mdot;
 499    NYD_ENTER;
 500
 501    mdot = newfileinfo();
 502    vec[0] = mdot;
 503    vec[1] = 0;
 504    dot = message + mdot - 1;
 505    if (printheaders && msgCount > 0 && ok_blook(header)) {
 506       print_header_group(vec); /* XXX errors? */
 507    }
 508    NYD_LEAVE;
 509 }
 510
 511 FL int
 512 newfileinfo(void)
 513 {
 514    struct message *mp;
 515    int u, n, mdot, d, s, hidden, moved;
 516    NYD_ENTER;
 517
 518    if (mb.mb_type == MB_VOID) {
 519       mdot = 1;
 520       goto jleave;
 521    }
 522
 523    mdot = getmdot(0);
 524    s = d = hidden = moved =0;
 525    for (mp = message, n = 0, u = 0; PTRCMP(mp, <, message + msgCount); ++mp) {
 526       if (mp->m_flag & MNEW)
 527          ++n;
 528       if ((mp->m_flag & MREAD) == 0)
 529          ++u;
 530       if ((mp->m_flag & (MDELETED | MSAVED)) == (MDELETED | MSAVED))
 531          ++moved;
 532       if ((mp->m_flag & (MDELETED | MSAVED)) == MDELETED)
 533          ++d;
 534       if ((mp->m_flag & (MDELETED | MSAVED)) == MSAVED)
 535          ++s;
 536       if (mp->m_flag & MHIDDEN)
 537          ++hidden;
 538    }
 539
 540    /* If displayname gets truncated the user effectively has no option to see
 541     * the full pathname of the mailbox, so print it at least for '? fi' */
 542    printf(_("%s: "), n_shell_quote_cp(
 543       (_update_mailname(NULL) ? displayname : mailname), FAL0));
 544    if (msgCount == 1)
 545       printf(_("1 message"));
 546    else
 547       printf(_("%d messages"), msgCount);
 548    if (n > 0)
 549       printf(_(" %d new"), n);
 550    if (u-n > 0)
 551       printf(_(" %d unread"), u);
 552    if (d > 0)
 553       printf(_(" %d deleted"), d);
 554    if (s > 0)
 555       printf(_(" %d saved"), s);
 556    if (moved > 0)
 557       printf(_(" %d moved"), moved);
 558    if (hidden > 0)
 559       printf(_(" %d hidden"), hidden);
 560    else if (mb.mb_perm == 0)
 561       printf(_(" [Read only]"));
 562    printf("\n");
 563 jleave:
 564    NYD_LEAVE;
 565    return mdot;
 566 }
 567
 568 FL int
 569 getmdot(int nmail)
 570 {
 571    struct message *mp;
 572    char *cp;
 573    int mdot;
 574    enum mflag avoid = MHIDDEN | MDELETED;
 575    NYD_ENTER;
 576
 577    if (!nmail) {
 578       if (ok_blook(autothread)) {
 579          OBSOLETE(_("please use *autosort=thread* instead of *autothread*"));
 580          c_thread(NULL);
 581       } else if ((cp = ok_vlook(autosort)) != NULL) {
 582          if (mb.mb_sorted != NULL)
 583             free(mb.mb_sorted);
 584          mb.mb_sorted = sstrdup(cp);
 585          c_sort(NULL);
 586       }
 587    }
 588    if (mb.mb_type == MB_VOID) {
 589       mdot = 1;
 590       goto jleave;
 591    }
 592
 593    if (nmail)
 594       for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 595          if ((mp->m_flag & (MNEWEST | avoid)) == MNEWEST)
 596             break;
 597
 598    if (!nmail || PTRCMP(mp, >=, message + msgCount)) {
 599       if (mb.mb_threaded) {
 600          for (mp = threadroot; mp != NULL; mp = next_in_thread(mp))
 601             if ((mp->m_flag & (MNEW | avoid)) == MNEW)
 602                break;
 603       } else {
 604          for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 605             if ((mp->m_flag & (MNEW | avoid)) == MNEW)
 606                break;
 607       }
 608    }
 609
 610    if ((mb.mb_threaded ? (mp == NULL) : PTRCMP(mp, >=, message + msgCount))) {
 611       if (mb.mb_threaded) {
 612          for (mp = threadroot; mp != NULL; mp = next_in_thread(mp))
 613             if (mp->m_flag & MFLAGGED)
 614                break;
 615       } else {
 616          for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 617             if (mp->m_flag & MFLAGGED)
 618                break;
 619       }
 620    }
 621
 622    if ((mb.mb_threaded ? (mp == NULL) : PTRCMP(mp, >=, message + msgCount))) {
 623       if (mb.mb_threaded) {
 624          for (mp = threadroot; mp != NULL; mp = next_in_thread(mp))
 625             if (!(mp->m_flag & (MREAD | avoid)))
 626                break;
 627       } else {
 628          for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 629             if (!(mp->m_flag & (MREAD | avoid)))
 630                break;
 631       }
 632    }
 633
 634    if (nmail &&
 635          (mb.mb_threaded ? (mp != NULL) : PTRCMP(mp, <, message + msgCount)))
 636       mdot = (int)PTR2SIZE(mp - message + 1);
 637    else if (ok_blook(showlast)) {
 638       if (mb.mb_threaded) {
 639          for (mp = this_in_thread(threadroot, -1); mp;
 640                mp = prev_in_thread(mp))
 641             if (!(mp->m_flag & avoid))
 642                break;
 643          mdot = (mp != NULL) ? (int)PTR2SIZE(mp - message + 1) : msgCount;
 644       } else {
 645          for (mp = message + msgCount - 1; mp >= message; --mp)
 646             if (!(mp->m_flag & avoid))
 647                break;
 648          mdot = (mp >= message) ? (int)PTR2SIZE(mp - message + 1) : msgCount;
 649       }
 650    } else if (!nmail &&
 651          (mb.mb_threaded ? (mp != NULL) : PTRCMP(mp, <, message + msgCount)))
 652       mdot = (int)PTR2SIZE(mp - message + 1);
 653    else if (mb.mb_threaded) {
 654       for (mp = threadroot; mp; mp = next_in_thread(mp))
 655          if (!(mp->m_flag & avoid))
 656             break;
 657       mdot = (mp != NULL) ? (int)PTR2SIZE(mp - message + 1) : 1;
 658    } else {
 659       for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 660          if (!(mp->m_flag & avoid))
 661             break;
 662       mdot = PTRCMP(mp, <, message + msgCount)
 663             ? (int)PTR2SIZE(mp - message + 1) : 1;
 664    }
 665 jleave:
 666    NYD_LEAVE;
 667    return mdot;
 668 }
 669
 670 FL void
 671 initbox(char const *name)
 672 {
 673    char *tempMesg;
 674    NYD_ENTER;
 675
 676    if (mb.mb_type != MB_VOID)
 677       n_strscpy(prevfile, mailname, PATH_MAX);
 678
 679    /* TODO name always NE mailname (but goes away for objects anyway)
 680     * TODO Well, not true no more except that in parens */
 681    _update_mailname((name != mailname) ? name : NULL);
 682
 683    if ((mb.mb_otf = Ftmp(&tempMesg, "tmpmbox", OF_WRONLY | OF_HOLDSIGS)) ==
 684          NULL) {
 685       n_perr(_("temporary mail message file"), 0);
 686       exit(EXIT_ERR);
 687    }
 688    if ((mb.mb_itf = safe_fopen(tempMesg, "r", NULL)) == NULL) {
 689       n_perr(_("temporary mail message file"), 0);
 690       exit(EXIT_ERR);
 691    }
 692    Ftmp_release(&tempMesg);
 693
 694    message_reset();
 695    mb.mb_threaded = 0;
 696    if (mb.mb_sorted != NULL) {
 697       free(mb.mb_sorted);
 698       mb.mb_sorted = NULL;
 699    }
 700    dot = prevdot = threadroot = NULL;
 701    pstate &= ~PS_DID_PRINT_DOT;
 702    NYD_LEAVE;
 703 }
 704
 705 FL char const *
 706 folder_query(void){
 707    struct n_string s, *sp = &s;
 708    char *cp;
 709    char const *rv;
 710    bool_t err;
 711    NYD_ENTER;
 712
 713    /* *folder* is linked with *_folder_resolved*: we only use the latter */
 714    for(err = FAL0;;){
 715       if((rv = ok_vlook(_folder_resolved)) != NULL)
 716          break;
 717
 718       /* POSIX says:
 719        *    If directory does not start with a <slash> ('/'), the contents
 720        *    of HOME shall be prefixed to it.
 721        * And:
 722        *    If folder is unset or set to null, [.] filenames beginning with
 723        *    '+' shall refer to files in the current directory.
 724        * We may have the result already */
 725       rv = "";
 726       err = FAL0;
 727
 728       if((cp = ok_vlook(folder)) == NULL)
 729          goto jset;
 730
 731       /* Expand the *folder*; skip %: prefix for simplicity of use */
 732       if(cp[0] == '%' && cp[1] == ':')
 733          cp += 2;
 734       if((err = (cp = fexpand(cp, FEXP_NSHELL)) == NULL) || *cp == '\0')
 735          goto jset;
 736
 737       switch(which_protocol(cp)){
 738       case PROTO_POP3:
 739          n_err(_("*folder* can't be set to a flat, readonly POP3 account\n"));
 740          err = TRU1;
 741          goto jset;
 742       default:
 743          /* Further expansion desired */
 744          break;
 745       }
 746
 747       /* Prefix HOME as necessary */
 748       if(*cp != '/'){
 749          char const *home = ok_vlook(HOME);
 750          size_t l1 = strlen(home), l2 = strlen(cp);
 751
 752          sp = n_string_creat_auto(sp);
 753          sp = n_string_reserve(sp, l1 + 1 + l2 +1);
 754          sp = n_string_push_buf(sp, home, l1);
 755          sp = n_string_push_c(sp, '/');
 756          sp = n_string_push_buf(sp, cp, l2);
 757          cp = n_string_cp(sp);
 758       }
 759
 760       rv = cp;
 761
 762       /* TODO Since our visual mailname is resolved via realpath(3) if available
 763        * TODO to avoid that we loose track of our currently open folder in case
 764        * TODO we chdir away, but still checks the leading path portion against
 765        * TODO fold_query() to be able to abbreviate to the +FOLDER syntax if
 766        * TODO possible, we need to realpath(3) the folder, too */
 767 #ifdef HAVE_REALPATH
 768       /* C99 */{
 769 # ifndef HAVE_REALPATH_NULL
 770          if(cp == sp->s_dat)
 771             sp = n_string_drop_ownership(sp);
 772          sp = n_string_reserve(sp, PATH_MAX +1);
 773 # else
 774          sp->s_dat = NULL;
 775 # endif
 776
 777          if((sp->s_dat = realpath(cp, sp->s_dat)) != NULL){
 778 # ifdef HAVE_REALPATH_NULL
 779             sp->s_dat = savestr(cp = sp->s_dat);
 780             (free)(cp);
 781 # endif
 782             rv = sp->s_dat;
 783          }else if(errno == ENOENT)
 784             rv = cp;
 785          else{
 786             n_err(_("Can't canonicalize *folder*: %s\n"),
 787                n_shell_quote_cp(cp, FAL0));
 788             err = TRU1;
 789             rv = "";
 790          }
 791       }
 792 #endif /* HAVE_REALPATH */
 793
 794 jset:
 795       /* C99 */{
 796          bool_t reset = !(pstate & PS_ROOT);
 797
 798          pstate |= PS_ROOT;
 799          ok_vset(_folder_resolved, rv);
 800          if(reset)
 801             pstate &= ~PS_ROOT;
 802       }
 803    }
 804
 805    if(err){
 806       n_err(_("*folder* is not resolvable, using CWD\n"));
 807       assert(rv != NULL && *rv == '\0');
 808    }
 809    NYD_LEAVE;
 810    return rv;
 811 }
 812
 813 /* s-it-mode */