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_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    NYD_LEAVE;
 141    return rv;
 142 }
 143
 144 FL int
 145 setfile(char const *name, enum fedit_mode fm) /* TODO oh my god */
 146 {
 147    /* Note we don't 'userid(myname) != getuid()', preliminary steps are usually
 148     * necessary to make a mailbox accessible by a different user, and if that
 149     * has happened, let's just let the usual file perms decide */
 150    static int shudclob;
 151
 152    struct stat stb;
 153    size_t offset;
 154    char const *who;
 155    int rv, omsgCount = 0;
 156    FILE *ibuf = NULL, *lckfp = NULL;
 157    bool_t isdevnull = FAL0;
 158    NYD_ENTER;
 159
 160    pstate &= ~PS_SETFILE_OPENED;
 161
 162    /* C99 */{
 163       enum fexp_mode fexpm;
 164
 165       if((who = shortcut_expand(name)) != NULL){
 166          fexpm = FEXP_NSHORTCUT | FEXP_NSHELL;
 167          name = who;
 168       }else
 169          fexpm = FEXP_NSHELL;
 170
 171       if(name[0] == '%'){
 172          fm |= FEDIT_SYSBOX; /* TODO fexpand() needs to tell is-valid-user! */
 173          if(*(who = &name[1]) == ':')
 174             ++who;
 175          if(*who == '\0')
 176             who = myname;
 177       }else
 178          who = myname;
 179
 180       if ((name = fexpand(name, fexpm)) == NULL)
 181          goto jem1;
 182    }
 183
 184    /* For at least substdate() users */
 185    time_current_update(&time_current, FAL0);
 186
 187    switch (which_protocol(name)) {
 188    case PROTO_FILE:
 189       if (temporary_protocol_ext != NULL)
 190          name = savecat(name, temporary_protocol_ext);
 191       isdevnull = ((options & OPT_BATCH_FLAG) && !strcmp(name, "/dev/null"));
 192 #ifdef HAVE_REALPATH
 193       do { /* TODO we need objects, goes away then */
 194 # ifdef HAVE_REALPATH_NULL
 195          char *cp;
 196
 197          if ((cp = realpath(name, NULL)) != NULL) {
 198             name = savestr(cp);
 199             (free)(cp);
 200          }
 201 # else
 202          char cbuf[PATH_MAX];
 203
 204          if (realpath(name, cbuf) != NULL)
 205             name = savestr(cbuf);
 206 # endif
 207       } while (0);
 208 #endif
 209       rv = 1;
 210       break;
 211    case PROTO_MAILDIR:
 212       shudclob = 1;
 213       rv = maildir_setfile(name, fm);
 214       goto jleave;
 215 #ifdef HAVE_POP3
 216    case PROTO_POP3:
 217       shudclob = 1;
 218       rv = pop3_setfile(name, fm);
 219       goto jleave;
 220 #endif
 221    default:
 222       n_err(_("Cannot handle protocol: %s\n"), name);
 223       goto jem1;
 224    }
 225
 226    if ((ibuf = Zopen(name, "r")) == NULL) {
 227       if ((fm & FEDIT_SYSBOX) && errno == ENOENT) {
 228          if (strcmp(who, myname) && getpwnam(who) == NULL) {
 229             n_err(_("%s is not a user of this system\n"),
 230                n_shexp_quote_cp(who, FAL0));
 231             goto jem2;
 232          }
 233          if (!(options & OPT_QUICKRUN_MASK) && ok_blook(bsdcompat))
 234             n_err(_("No mail for %s\n"), who);
 235       }
 236       if (fm & FEDIT_NEWMAIL)
 237          goto jleave;
 238
 239       mb.mb_type = MB_VOID;
 240       if (ok_blook(emptystart)) {
 241          if (!(options & OPT_QUICKRUN_MASK) && !ok_blook(bsdcompat))
 242             n_perr(name, 0);
 243          /* We must avoid returning -1 and causing program exit */
 244          rv = 1;
 245          goto jleave;
 246       }
 247       n_perr(name, 0);
 248       goto jem1;
 249    }
 250
 251    if (fstat(fileno(ibuf), &stb) == -1) {
 252       if (fm & FEDIT_NEWMAIL)
 253          goto jleave;
 254       n_perr(_("fstat"), 0);
 255       goto jem1;
 256    }
 257
 258    if (S_ISREG(stb.st_mode) || isdevnull) {
 259       /* EMPTY */
 260    } else {
 261       if (fm & FEDIT_NEWMAIL)
 262          goto jleave;
 263       errno = S_ISDIR(stb.st_mode) ? EISDIR : EINVAL;
 264       n_perr(name, 0);
 265       goto jem1;
 266    }
 267
 268    /* Looks like all will be well.  We must now relinquish our hold on the
 269     * current set of stuff.  Must hold signals while we are reading the new
 270     * file, else we will ruin the message[] data structure */
 271
 272    hold_sigs(); /* TODO note on this one in quit.c:quit() */
 273    if (shudclob && !(fm & FEDIT_NEWMAIL) && !quit()) {
 274       rele_sigs();
 275       goto jem2;
 276    }
 277
 278 #ifdef HAVE_SOCKETS
 279    if (!(fm & FEDIT_NEWMAIL) && mb.mb_sock.s_fd >= 0)
 280       sclose(&mb.mb_sock); /* TODO sorry? VMAILFS->close(), thank you */
 281 #endif
 282
 283    /* TODO There is no intermediate VOID box we've switched to: name may
 284     * TODO point to the same box that we just have written, so any updates
 285     * TODO we won't see!  Reopen again in this case.  RACY! Goes with VOID! */
 286    /* TODO In addition: in case of compressed/hook boxes we lock a temporary! */
 287    /* TODO We may uselessly open twice but quit() doesn't say whether we were
 288     * TODO modified so we can't tell: Mailbox::is_modified() :-(( */
 289    if (/*shudclob && !(fm & FEDIT_NEWMAIL) &&*/ !strcmp(name, mailname)) {
 290       name = mailname;
 291       Fclose(ibuf);
 292
 293       if ((ibuf = Zopen(name, "r")) == NULL ||
 294             fstat(fileno(ibuf), &stb) == -1 ||
 295             (!S_ISREG(stb.st_mode) && !isdevnull)) {
 296          n_perr(name, 0);
 297          rele_sigs();
 298          goto jem2;
 299       }
 300    }
 301
 302    /* Copy the messages into /tmp and set pointers */
 303    if (!(fm & FEDIT_NEWMAIL)) {
 304       if (isdevnull) {
 305          mb.mb_type = MB_VOID;
 306          mb.mb_perm = 0;
 307       } else {
 308          mb.mb_type = MB_FILE;
 309          mb.mb_perm = (((options & OPT_R_FLAG) || (fm & FEDIT_RDONLY) ||
 310                access(name, W_OK) < 0) ? 0 : MB_DELE | MB_EDIT);
 311          if (shudclob) {
 312             if (mb.mb_itf) {
 313                fclose(mb.mb_itf);
 314                mb.mb_itf = NULL;
 315             }
 316             if (mb.mb_otf) {
 317                fclose(mb.mb_otf);
 318                mb.mb_otf = NULL;
 319             }
 320          }
 321       }
 322       shudclob = 1;
 323       if (fm & FEDIT_SYSBOX)
 324          pstate &= ~PS_EDIT;
 325       else
 326          pstate |= PS_EDIT;
 327       initbox(name);
 328       offset = 0;
 329    } else {
 330       fseek(mb.mb_otf, 0L, SEEK_END);
 331       /* TODO Doing this without holding a lock is.. And not err checking.. */
 332       fseek(ibuf, mailsize, SEEK_SET);
 333       offset = mailsize;
 334       omsgCount = msgCount;
 335    }
 336
 337    if (isdevnull)
 338       lckfp = (FILE*)-1;
 339    else if (!(pstate & PS_EDIT))
 340       lckfp = n_dotlock(name, fileno(ibuf), FLT_READ, offset,0,
 341             (fm & FEDIT_NEWMAIL ? 0 : UIZ_MAX));
 342    else if (n_file_lock(fileno(ibuf), FLT_READ, offset,0,
 343          (fm & FEDIT_NEWMAIL ? 0 : UIZ_MAX)))
 344       lckfp = (FILE*)-1;
 345
 346    if (lckfp == NULL) {
 347       if (!(fm & FEDIT_NEWMAIL)) {
 348          char const *emsg = (pstate & PS_EDIT)
 349                ? N_("Unable to lock mailbox, aborting operation")
 350                : N_("Unable to (dot) lock mailbox, aborting operation");
 351          n_perr(V_(emsg), 0);
 352       }
 353       rele_sigs();
 354       if (!(fm & FEDIT_NEWMAIL))
 355          goto jem1;
 356       goto jleave;
 357    }
 358
 359    mailsize = fsize(ibuf);
 360
 361    /* TODO This is too simple minded?  We should regenerate an index file
 362     * TODO to be able to truly tell whether *anything* has changed! */
 363    if ((fm & FEDIT_NEWMAIL) && UICMP(z, mailsize, <=, offset)) {
 364       rele_sigs();
 365       goto jleave;
 366    }
 367    setptr(ibuf, offset);
 368    setmsize(msgCount);
 369    if ((fm & FEDIT_NEWMAIL) && mb.mb_sorted) {
 370       mb.mb_threaded = 0;
 371       c_sort((void*)-1);
 372    }
 373
 374    Fclose(ibuf);
 375    ibuf = NULL;
 376    if (lckfp != NULL && lckfp != (FILE*)-1) {
 377       Pclose(lckfp, FAL0);
 378       /*lckfp = NULL;*/
 379    }
 380    rele_sigs();
 381
 382    if (!(fm & FEDIT_NEWMAIL)) {
 383       pstate &= ~PS_SAW_COMMAND;
 384       pstate |= PS_SETFILE_OPENED;
 385    }
 386
 387    if ((options & OPT_EXISTONLY) && !(options & OPT_HEADERLIST)) {
 388       rv = (msgCount == 0);
 389       goto jleave;
 390    }
 391
 392    if ((!(pstate & PS_EDIT) || (fm & FEDIT_NEWMAIL)) && msgCount == 0) {
 393       if (!(fm & FEDIT_NEWMAIL)) {
 394          if (!ok_blook(emptystart))
 395             n_err(_("No mail for %s\n"), who);
 396       }
 397       goto jleave;
 398    }
 399
 400    if (fm & FEDIT_NEWMAIL)
 401       newmailinfo(omsgCount);
 402
 403    rv = 0;
 404 jleave:
 405    if (ibuf != NULL) {
 406       Fclose(ibuf);
 407       if (lckfp != NULL && lckfp != (FILE*)-1)
 408          Pclose(lckfp, FAL0);
 409    }
 410    NYD_LEAVE;
 411    return rv;
 412 jem2:
 413    mb.mb_type = MB_VOID;
 414 jem1:
 415    rv = -1;
 416    goto jleave;
 417 }
 418
 419 FL int
 420 newmailinfo(int omsgCount)
 421 {
 422    int mdot, i;
 423    NYD_ENTER;
 424
 425    for (i = 0; i < omsgCount; ++i)
 426       message[i].m_flag &= ~MNEWEST;
 427
 428    if (msgCount > omsgCount) {
 429       for (i = omsgCount; i < msgCount; ++i)
 430          message[i].m_flag |= MNEWEST;
 431       printf(_("New mail has arrived.\n"));
 432       if ((i = msgCount - omsgCount) == 1)
 433          printf(_("Loaded 1 new message.\n"));
 434       else
 435          printf(_("Loaded %d new messages.\n"), i);
 436    } else
 437       printf(_("Loaded %d messages.\n"), msgCount);
 438
 439    check_folder_hook(TRU1);
 440
 441    mdot = getmdot(1);
 442
 443    if (ok_blook(header))
 444       print_headers(omsgCount + 1, msgCount, FAL0);
 445    NYD_LEAVE;
 446    return mdot;
 447 }
 448
 449 FL void
 450 setmsize(int sz)
 451 {
 452    NYD_ENTER;
 453    if (n_msgvec != NULL)
 454       free(n_msgvec);
 455    n_msgvec = scalloc(sz + 1, sizeof *n_msgvec);
 456    NYD_LEAVE;
 457 }
 458
 459 FL void
 460 print_header_summary(char const *Larg)
 461 {
 462    size_t bot, top, i, j;
 463    NYD_ENTER;
 464
 465    if (Larg != NULL) {
 466       /* Avoid any messages XXX add a make_mua_silent() and use it? */
 467       if ((options & (OPT_VERB | OPT_EXISTONLY)) == OPT_EXISTONLY) {
 468          freopen("/dev/null", "w", stdout);
 469          freopen("/dev/null", "w", stderr);
 470       }
 471       assert(n_msgvec != NULL);
 472       i = (getmsglist(/*TODO make arg const */UNCONST(Larg), n_msgvec, 0) <= 0);
 473       if (options & OPT_EXISTONLY) {
 474          exit_status = (int)i;
 475          goto jleave;
 476       }
 477       if (i)
 478          goto jleave;
 479       for (bot = msgCount, top = 0, i = 0; (j = n_msgvec[i]) != 0; ++i) {
 480          if (bot > j)
 481             bot = j;
 482          if (top < j)
 483             top = j;
 484       }
 485    } else
 486       bot = 1, top = msgCount;
 487    print_headers(bot, top, (Larg != NULL)); /* TODO should take iterator!! */
 488 jleave:
 489    NYD_LEAVE;
 490 }
 491
 492 FL void
 493 announce(int printheaders)
 494 {
 495    int vec[2], mdot;
 496    NYD_ENTER;
 497
 498    mdot = newfileinfo();
 499    vec[0] = mdot;
 500    vec[1] = 0;
 501    dot = message + mdot - 1;
 502    if (printheaders && msgCount > 0 && ok_blook(header)) {
 503       print_header_group(vec); /* XXX errors? */
 504    }
 505    NYD_LEAVE;
 506 }
 507
 508 FL int
 509 newfileinfo(void)
 510 {
 511    struct message *mp;
 512    int u, n, mdot, d, s, hidden, moved;
 513    NYD_ENTER;
 514
 515    if (mb.mb_type == MB_VOID) {
 516       mdot = 1;
 517       goto jleave;
 518    }
 519
 520    mdot = getmdot(0);
 521    s = d = hidden = moved =0;
 522    for (mp = message, n = 0, u = 0; PTRCMP(mp, <, message + msgCount); ++mp) {
 523       if (mp->m_flag & MNEW)
 524          ++n;
 525       if ((mp->m_flag & MREAD) == 0)
 526          ++u;
 527       if ((mp->m_flag & (MDELETED | MSAVED)) == (MDELETED | MSAVED))
 528          ++moved;
 529       if ((mp->m_flag & (MDELETED | MSAVED)) == MDELETED)
 530          ++d;
 531       if ((mp->m_flag & (MDELETED | MSAVED)) == MSAVED)
 532          ++s;
 533       if (mp->m_flag & MHIDDEN)
 534          ++hidden;
 535    }
 536
 537    /* If displayname gets truncated the user effectively has no option to see
 538     * the full pathname of the mailbox, so print it at least for '? fi' */
 539    printf(_("%s: "), n_shexp_quote_cp(
 540       (_update_mailname(NULL) ? displayname : mailname), FAL0));
 541    if (msgCount == 1)
 542       printf(_("1 message"));
 543    else
 544       printf(_("%d messages"), msgCount);
 545    if (n > 0)
 546       printf(_(" %d new"), n);
 547    if (u-n > 0)
 548       printf(_(" %d unread"), u);
 549    if (d > 0)
 550       printf(_(" %d deleted"), d);
 551    if (s > 0)
 552       printf(_(" %d saved"), s);
 553    if (moved > 0)
 554       printf(_(" %d moved"), moved);
 555    if (hidden > 0)
 556       printf(_(" %d hidden"), hidden);
 557    else if (mb.mb_perm == 0)
 558       printf(_(" [Read only]"));
 559    printf("\n");
 560 jleave:
 561    NYD_LEAVE;
 562    return mdot;
 563 }
 564
 565 FL int
 566 getmdot(int nmail)
 567 {
 568    struct message *mp;
 569    char *cp;
 570    int mdot;
 571    enum mflag avoid = MHIDDEN | MDELETED;
 572    NYD_ENTER;
 573
 574    if (!nmail) {
 575       if (ok_blook(autothread)) {
 576          OBSOLETE(_("please use *autosort=thread* instead of *autothread*"));
 577          c_thread(NULL);
 578       } else if ((cp = ok_vlook(autosort)) != NULL) {
 579          if (mb.mb_sorted != NULL)
 580             free(mb.mb_sorted);
 581          mb.mb_sorted = sstrdup(cp);
 582          c_sort(NULL);
 583       }
 584    }
 585    if (mb.mb_type == MB_VOID) {
 586       mdot = 1;
 587       goto jleave;
 588    }
 589
 590    if (nmail)
 591       for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 592          if ((mp->m_flag & (MNEWEST | avoid)) == MNEWEST)
 593             break;
 594
 595    if (!nmail || PTRCMP(mp, >=, message + msgCount)) {
 596       if (mb.mb_threaded) {
 597          for (mp = threadroot; mp != NULL; mp = next_in_thread(mp))
 598             if ((mp->m_flag & (MNEW | avoid)) == MNEW)
 599                break;
 600       } else {
 601          for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 602             if ((mp->m_flag & (MNEW | avoid)) == MNEW)
 603                break;
 604       }
 605    }
 606
 607    if ((mb.mb_threaded ? (mp == NULL) : PTRCMP(mp, >=, message + msgCount))) {
 608       if (mb.mb_threaded) {
 609          for (mp = threadroot; mp != NULL; mp = next_in_thread(mp))
 610             if (mp->m_flag & MFLAGGED)
 611                break;
 612       } else {
 613          for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 614             if (mp->m_flag & MFLAGGED)
 615                break;
 616       }
 617    }
 618
 619    if ((mb.mb_threaded ? (mp == NULL) : PTRCMP(mp, >=, message + msgCount))) {
 620       if (mb.mb_threaded) {
 621          for (mp = threadroot; mp != NULL; mp = next_in_thread(mp))
 622             if (!(mp->m_flag & (MREAD | avoid)))
 623                break;
 624       } else {
 625          for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 626             if (!(mp->m_flag & (MREAD | avoid)))
 627                break;
 628       }
 629    }
 630
 631    if (nmail &&
 632          (mb.mb_threaded ? (mp != NULL) : PTRCMP(mp, <, message + msgCount)))
 633       mdot = (int)PTR2SIZE(mp - message + 1);
 634    else if (ok_blook(showlast)) {
 635       if (mb.mb_threaded) {
 636          for (mp = this_in_thread(threadroot, -1); mp;
 637                mp = prev_in_thread(mp))
 638             if (!(mp->m_flag & avoid))
 639                break;
 640          mdot = (mp != NULL) ? (int)PTR2SIZE(mp - message + 1) : msgCount;
 641       } else {
 642          for (mp = message + msgCount - 1; mp >= message; --mp)
 643             if (!(mp->m_flag & avoid))
 644                break;
 645          mdot = (mp >= message) ? (int)PTR2SIZE(mp - message + 1) : msgCount;
 646       }
 647    } else if (!nmail &&
 648          (mb.mb_threaded ? (mp != NULL) : PTRCMP(mp, <, message + msgCount)))
 649       mdot = (int)PTR2SIZE(mp - message + 1);
 650    else if (mb.mb_threaded) {
 651       for (mp = threadroot; mp; mp = next_in_thread(mp))
 652          if (!(mp->m_flag & avoid))
 653             break;
 654       mdot = (mp != NULL) ? (int)PTR2SIZE(mp - message + 1) : 1;
 655    } else {
 656       for (mp = message; PTRCMP(mp, <, message + msgCount); ++mp)
 657          if (!(mp->m_flag & avoid))
 658             break;
 659       mdot = PTRCMP(mp, <, message + msgCount)
 660             ? (int)PTR2SIZE(mp - message + 1) : 1;
 661    }
 662 jleave:
 663    NYD_LEAVE;
 664    return mdot;
 665 }
 666
 667 FL void
 668 initbox(char const *name)
 669 {
 670    char *tempMesg;
 671    NYD_ENTER;
 672
 673    if (mb.mb_type != MB_VOID)
 674       n_strscpy(prevfile, mailname, PATH_MAX);
 675
 676    /* TODO name always NE mailname (but goes away for objects anyway)
 677     * TODO Well, not true no more except that in parens */
 678    _update_mailname((name != mailname) ? name : NULL);
 679
 680    if ((mb.mb_otf = Ftmp(&tempMesg, "tmpmbox", OF_WRONLY | OF_HOLDSIGS)) ==
 681          NULL) {
 682       n_perr(_("temporary mail message file"), 0);
 683       exit(EXIT_ERR);
 684    }
 685    if ((mb.mb_itf = safe_fopen(tempMesg, "r", NULL)) == NULL) {
 686       n_perr(_("temporary mail message file"), 0);
 687       exit(EXIT_ERR);
 688    }
 689    Ftmp_release(&tempMesg);
 690
 691    message_reset();
 692    mb.mb_threaded = 0;
 693    if (mb.mb_sorted != NULL) {
 694       free(mb.mb_sorted);
 695       mb.mb_sorted = NULL;
 696    }
 697    dot = prevdot = threadroot = NULL;
 698    pstate &= ~PS_DID_PRINT_DOT;
 699    NYD_LEAVE;
 700 }
 701
 702 FL char const *
 703 folder_query(void){
 704    struct n_string s, *sp = &s;
 705    char *cp;
 706    char const *rv;
 707    bool_t err;
 708    NYD_ENTER;
 709
 710    sp = n_string_creat_auto(sp);
 711
 712    /* *folder* is linked with *_folder_resolved*: we only use the latter */
 713    for(err = FAL0;;){
 714       if((rv = ok_vlook(_folder_resolved)) != NULL)
 715          break;
 716
 717       /* POSIX says:
 718        *    If directory does not start with a <slash> ('/'), the contents
 719        *    of HOME shall be prefixed to it.
 720        * And:
 721        *    If folder is unset or set to null, [.] filenames beginning with
 722        *    '+' shall refer to files in the current directory.
 723        * We may have the result already */
 724       rv = "";
 725       err = FAL0;
 726
 727       if((cp = ok_vlook(folder)) == NULL)
 728          goto jset;
 729
 730       /* Expand the *folder*; skip %: prefix for simplicity of use */
 731       if(cp[0] == '%' && cp[1] == ':')
 732          cp += 2;
 733       if((err = (cp = fexpand(cp, FEXP_NSPECIAL | FEXP_NFOLDER | FEXP_NSHELL)
 734             ) == 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 != '/'){ /* XXX path_is_absolute() */
 749          size_t l1, l2;
 750          char const *home;
 751
 752          home = ok_vlook(HOME);
 753          l1 = strlen(home);
 754          l2 = strlen(cp);
 755
 756          sp = n_string_reserve(sp, l1 + 1 + l2 +1);
 757          sp = n_string_push_buf(sp, home, l1);
 758          sp = n_string_push_c(sp, '/');
 759          sp = n_string_push_buf(sp, cp, l2);
 760          cp = n_string_cp(sp);
 761          sp = n_string_drop_ownership(sp);
 762       }
 763
 764       rv = cp;
 765
 766       /* TODO Since our visual mailname is resolved via realpath(3) if available
 767        * TODO to avoid that we loose track of our currently open folder in case
 768        * TODO we chdir away, but still checks the leading path portion against
 769        * TODO folder_query() to be able to abbreviate to the +FOLDER syntax if
 770        * TODO possible, we need to realpath(3) the folder, too */
 771 #ifdef HAVE_REALPATH
 772       assert(sp->s_len == 0 && sp->s_dat == NULL);
 773 # ifndef HAVE_REALPATH_NULL
 774       sp = n_string_reserve(sp, PATH_MAX +1);
 775 # endif
 776
 777       if((sp->s_dat = realpath(cp, sp->s_dat)) != NULL){
 778 # ifdef HAVE_REALPATH_NULL
 779          n_string_cp(sp = n_string_assign_cp(sp, 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_shexp_quote_cp(cp, FAL0));
 788          err = TRU1;
 789          rv = "";
 790       }
 791       sp = n_string_drop_ownership(sp);
 792 #endif /* HAVE_REALPATH */
 793
 794       /* Always append a solidus to our result path upon success */
 795       if(!err){
 796          size_t i;
 797
 798          if(rv[(i = strlen(rv)) - 1] != '/'){
 799             sp = n_string_reserve(sp, i + 1 +1);
 800             sp = n_string_push_buf(sp, rv, i);
 801             sp = n_string_push_c(sp, '/');
 802             rv = n_string_cp(sp);
 803             sp = n_string_drop_ownership(sp);
 804          }
 805       }
 806
 807 jset:
 808       /* C99 */{
 809          bool_t reset = !(pstate & PS_ROOT);
 810
 811          pstate |= PS_ROOT;
 812          ok_vset(_folder_resolved, rv);
 813          if(reset)
 814             pstate &= ~PS_ROOT;
 815       }
 816    }
 817
 818    if(err){
 819       n_err(_("*folder* is not resolvable, using CWD\n"));
 820       assert(rv != NULL && *rv == '\0');
 821    }
 822    NYD_LEAVE;
 823    return rv;
 824 }
 825
 826 /* s-it-mode */