maildir.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Maildir folder support. FIXME rewrite - why do we chdir(2)??
   3  *@ FIXME indeed - my S-Postman Python (!) is faster dealing with maildir!!
   4  *
   5  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   6  * Copyright (c) 2012 - 2017 Steffen (Daode) Nurpmeso <steffen@sdaoden.eu>.
   7  */
   8 /*
   9  * Copyright (c) 2004
  10  * Gunnar Ritter.  All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *    This product includes software developed by Gunnar Ritter
  23  *    and his contributors.
  24  * 4. Neither the name of Gunnar Ritter nor the names of his contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY GUNNAR RITTER AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL GUNNAR RITTER OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40 #undef n_FILE
  41 #define n_FILE maildir
  42
  43 #ifndef HAVE_AMALGAMATION
  44 # include "nail.h"
  45 #endif
  46
  47 #include <dirent.h>
  48
  49 struct mditem {
  50    struct message *md_data;
  51    unsigned       md_hash;
  52 };
  53
  54 static struct mditem *_maildir_table;
  55 static ui32_t        _maildir_prime;
  56 static sigjmp_buf    _maildir_jmp;
  57
  58 static void             __maildircatch(int s);
  59 static void             __maildircatch_hold(int s);
  60
  61 static unsigned a_maildir_hash(char const *cp);
  62
  63 /* Do some cleanup in the tmp/ subdir */
  64 static void             _cleantmp(void);
  65
  66 static int              _maildir_setfile1(char const *name, enum fedit_mode fm,
  67                            int omsgCount);
  68
  69 /* In combination with the names from mkname(), this comparison function
  70  * ensures that the order of messages in a maildir folder created by mailx
  71  * remains always the same. In effect, if a mbox folder is transferred to
  72  * a maildir folder by 'copy *', the message order wont' change */
  73 static int              mdcmp(void const *a, void const *b);
  74
  75 static int              _maildir_subdir(char const *name, char const *sub,
  76                            enum fedit_mode fm);
  77
  78 static void             _maildir_append(char const *name, char const *sub,
  79                            char const *fn);
  80
  81 static void             readin(char const *name, struct message *m);
  82
  83 static void             maildir_update(void);
  84
  85 static void             _maildir_move(struct message *m);
  86
  87 static char *           mkname(time_t t, enum mflag f, char const *pref);
  88
  89 static enum okay        maildir_append1(char const *name, FILE *fp, off_t off1,
  90                            long size, enum mflag flag);
  91
  92 static enum okay        trycreate(char const *name);
  93
  94 static enum okay        mkmaildir(char const *name);
  95
  96 static struct message * mdlook(char const *name, struct message *data);
  97
  98 static void             mktable(void);
  99
 100 static enum okay        subdir_remove(char const *name, char const *sub);
 101
 102 static void
 103 __maildircatch(int s)
 104 {
 105    NYD_X; /* Signal handler */
 106    siglongjmp(_maildir_jmp, s);
 107 }
 108
 109 static void
 110 __maildircatch_hold(int s)
 111 {
 112    NYD_X; /* Signal handler */
 113    n_UNUSED(s);
 114    /* TODO no STDIO in signal handler, no _() tr's -- pre-translate interrupt
 115     * TODO globally; */
 116    n_err_sighdl(_("\nImportant operation in progress: "
 117       "interrupt again to forcefully abort\n"));
 118    safe_signal(SIGINT, &__maildircatch);
 119 }
 120
 121 static unsigned
 122 a_maildir_hash(char const *cp) /* TODO obsolete that -> torek_hash */
 123 {
 124    unsigned h = 0, g;
 125    NYD_ENTER;
 126
 127    cp--;
 128    while (*++cp) {
 129       h = (h << 4 & 0xffffffff) + (*cp&0377);
 130       if ((g = h & 0xf0000000) != 0) {
 131          h = h ^ g >> 24;
 132          h = h ^ g;
 133       }
 134    }
 135    NYD_LEAVE;
 136    return h;
 137 }
 138
 139 static void
 140 _cleantmp(void)
 141 {
 142    char dep[PATH_MAX];
 143    struct stat st;
 144    time_t now;
 145    DIR *dirp;
 146    struct dirent *dp;
 147    NYD_ENTER;
 148
 149    if ((dirp = opendir("tmp")) == NULL)
 150       goto jleave;
 151
 152    now = n_time_epoch();
 153    while ((dp = readdir(dirp)) != NULL) {
 154       if (dp->d_name[0] == '.')
 155          continue;
 156       sstpcpy(sstpcpy(dep, "tmp/"), dp->d_name);
 157       if (stat(dep, &st) == -1)
 158          continue;
 159       if (st.st_atime + 36*3600 < now)
 160          unlink(dep);
 161    }
 162    closedir(dirp);
 163 jleave:
 164    NYD_LEAVE;
 165 }
 166
 167 static int
 168 _maildir_setfile1(char const *name, enum fedit_mode fm, int omsgCount)
 169 {
 170    int i;
 171    NYD_ENTER;
 172
 173    if (!(fm & FEDIT_NEWMAIL))
 174       _cleantmp();
 175
 176    mb.mb_perm = ((n_poption & n_PO_R_FLAG) || (fm & FEDIT_RDONLY))
 177          ? 0 : MB_DELE;
 178    if ((i = _maildir_subdir(name, "cur", fm)) != 0)
 179       goto jleave;
 180    if ((i = _maildir_subdir(name, "new", fm)) != 0)
 181       goto jleave;
 182    _maildir_append(name, NULL, NULL);
 183
 184    srelax_hold();
 185    for (i = ((fm & FEDIT_NEWMAIL) ? omsgCount : 0); i < msgCount; ++i) {
 186       readin(name, message + i);
 187       srelax();
 188    }
 189    srelax_rele();
 190
 191    if (fm & FEDIT_NEWMAIL) {
 192       if (msgCount > omsgCount)
 193          qsort(&message[omsgCount], msgCount - omsgCount, sizeof *message,
 194             &mdcmp);
 195    } else if (msgCount)
 196       qsort(message, msgCount, sizeof *message, &mdcmp);
 197    i = msgCount;
 198 jleave:
 199    NYD_LEAVE;
 200    return i;
 201 }
 202
 203 static int
 204 mdcmp(void const *a, void const *b)
 205 {
 206    struct message const *mpa = a, *mpb = b;
 207    long i;
 208    NYD_ENTER;
 209
 210    if ((i = mpa->m_time - mpb->m_time) == 0)
 211       i = strcmp(mpa->m_maildir_file + 4, mpb->m_maildir_file + 4);
 212    NYD_LEAVE;
 213    return i;
 214 }
 215
 216 static int
 217 _maildir_subdir(char const *name, char const *sub, enum fedit_mode fm)
 218 {
 219    DIR *dirp;
 220    struct dirent *dp;
 221    int rv;
 222    NYD_ENTER;
 223
 224    if ((dirp = opendir(sub)) == NULL) {
 225       n_err(_("Cannot open directory %s\n"),
 226          n_shexp_quote_cp(savecatsep(name, '/', sub), FAL0));
 227       rv = -1;
 228       goto jleave;
 229    }
 230    if (access(sub, W_OK) == -1)
 231       mb.mb_perm = 0;
 232    while ((dp = readdir(dirp)) != NULL) {
 233       if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' ||
 234             (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
 235          continue;
 236       if (dp->d_name[0] == '.')
 237          continue;
 238       if (!(fm & FEDIT_NEWMAIL) || mdlook(dp->d_name, NULL) == NULL)
 239          _maildir_append(name, sub, dp->d_name);
 240    }
 241    closedir(dirp);
 242    rv = 0;
 243 jleave:
 244    NYD_LEAVE;
 245    return rv;
 246 }
 247
 248 static void
 249 _maildir_append(char const *name, char const *sub, char const *fn)
 250 {
 251    struct message *m;
 252    size_t sz, i;
 253    time_t t = 0;
 254    enum mflag f = MUSED | MNOFROM | MNEWEST;
 255    char const *cp;
 256    char *xp;
 257    NYD_ENTER;
 258    n_UNUSED(name);
 259
 260    if (fn != NULL && sub != NULL) {
 261       if (!strcmp(sub, "new"))
 262          f |= MNEW;
 263       t = strtol(fn, &xp, 10);
 264       if ((cp = strrchr(xp, ',')) != NULL && PTRCMP(cp, >, xp + 2) &&
 265             cp[-1] == '2' && cp[-2] == ':') {
 266          while (*++cp != '\0') {
 267             switch (*cp) {
 268             case 'F':
 269                f |= MFLAGGED;
 270                break;
 271             case 'R':
 272                f |= MANSWERED;
 273                break;
 274             case 'S':
 275                f |= MREAD;
 276                break;
 277             case 'T':
 278                f |= MDELETED;
 279                break;
 280             case 'D':
 281                f |= MDRAFT;
 282                break;
 283             }
 284          }
 285       }
 286    }
 287
 288    /* Ensure room (and a NULLified last entry) */
 289    ++msgCount;
 290    message_append(NULL);
 291    --msgCount;
 292
 293    if (fn == NULL || sub == NULL)
 294       goto jleave;
 295
 296    m = message + msgCount++;
 297    i = strlen(fn);
 298    m->m_maildir_file = smalloc((sz = strlen(sub)) + i + 1 +1);
 299    memcpy(m->m_maildir_file, sub, sz);
 300    m->m_maildir_file[sz] = '/';
 301    memcpy(m->m_maildir_file + sz + 1, fn, i +1);
 302    m->m_time = t;
 303    m->m_flag = f;
 304    m->m_maildir_hash = ~a_maildir_hash(fn);
 305 jleave:
 306    NYD_LEAVE;
 307    return;
 308 }
 309
 310 static void
 311 readin(char const *name, struct message *m)
 312 {
 313    char *buf;
 314    size_t bufsize, buflen, cnt;
 315    long size = 0, lines = 0;
 316    off_t offset;
 317    FILE *fp;
 318    int emptyline = 0;
 319    NYD_ENTER;
 320
 321    if ((fp = Fopen(m->m_maildir_file, "r")) == NULL) {
 322       n_err(_("Cannot read %s for message %lu\n"),
 323          n_shexp_quote_cp(savecatsep(name, '/', m->m_maildir_file), FAL0),
 324          (ul_i)PTR2SIZE(m - message + 1));
 325       m->m_flag |= MHIDDEN;
 326       goto jleave;
 327    }
 328
 329    cnt = fsize(fp);
 330    fseek(mb.mb_otf, 0L, SEEK_END);
 331    offset = ftell(mb.mb_otf);
 332    buf = smalloc(bufsize = LINESIZE);
 333    buflen = 0;
 334    while (fgetline(&buf, &bufsize, &cnt, &buflen, fp, 1) != NULL) {
 335       /* Since we simply copy over data without doing any transfer
 336        * encoding reclassification/adjustment we *have* to perform
 337        * RFC 4155 compliant From_ quoting here */
 338       if (emptyline && is_head(buf, buflen, FAL0)) {
 339          putc('>', mb.mb_otf);
 340          ++size;
 341       }
 342       size += fwrite(buf, 1, buflen, mb.mb_otf);/*XXX err hdling*/
 343       emptyline = (*buf == '\n');
 344       ++lines;
 345    }
 346    free(buf);
 347    if (!emptyline) {
 348       putc('\n', mb.mb_otf);
 349       ++lines;
 350       ++size;
 351    }
 352
 353    Fclose(fp);
 354    fflush(mb.mb_otf);
 355    m->m_size = m->m_xsize = size;
 356    m->m_lines = m->m_xlines = lines;
 357    m->m_block = mailx_blockof(offset);
 358    m->m_offset = mailx_offsetof(offset);
 359    substdate(m);
 360 jleave:
 361    NYD_LEAVE;
 362 }
 363
 364 static void
 365 maildir_update(void)
 366 {
 367    struct message *m;
 368    int dodel, c, gotcha = 0, held = 0, modflags = 0;
 369    NYD_ENTER;
 370
 371    if (mb.mb_perm == 0)
 372       goto jfree;
 373
 374    if (!(n_pstate & n_PS_EDIT)) {
 375       holdbits();
 376       for (m = message, c = 0; PTRCMP(m, <, message + msgCount); ++m) {
 377          if (m->m_flag & MBOX)
 378             c++;
 379       }
 380       if (c > 0)
 381          if (makembox() == STOP)
 382             goto jbypass;
 383    }
 384    for (m = message, gotcha = 0, held = 0; PTRCMP(m, <, message + msgCount);
 385          ++m) {
 386       if (n_pstate & n_PS_EDIT)
 387          dodel = m->m_flag & MDELETED;
 388       else
 389          dodel = !((m->m_flag & MPRESERVE) || !(m->m_flag & MTOUCH));
 390       if (dodel) {
 391          if (unlink(m->m_maildir_file) < 0)
 392             n_err(_("Cannot delete file %s for message %lu\n"),
 393                n_shexp_quote_cp(savecatsep(mailname, '/', m->m_maildir_file),
 394                   FAL0), (ul_i)PTR2SIZE(m - message + 1));
 395          else
 396             ++gotcha;
 397       } else {
 398          if ((m->m_flag & (MREAD | MSTATUS)) == (MREAD | MSTATUS) ||
 399                (m->m_flag & (MNEW | MBOXED | MSAVED | MSTATUS | MFLAG |
 400                MUNFLAG | MANSWER | MUNANSWER | MDRAFT | MUNDRAFT))) {
 401             _maildir_move(m);
 402             ++modflags;
 403          }
 404          ++held;
 405       }
 406    }
 407 jbypass:
 408    if ((gotcha || modflags) && (n_pstate & n_PS_EDIT)) {
 409       fprintf(n_stdout, "%s %s\n",
 410          n_shexp_quote_cp(displayname, FAL0),
 411          ((ok_blook(bsdcompat) || ok_blook(bsdmsgs))
 412           ? _("complete") : _("updated.")));
 413    } else if (held && !(n_pstate & n_PS_EDIT) && mb.mb_perm != 0) {
 414       if (held == 1)
 415          fprintf(n_stdout, _("Held 1 message in %s\n"), displayname);
 416       else
 417          fprintf(n_stdout, _("Held %d messages in %s\n"), held, displayname);
 418    }
 419    fflush(n_stdout);
 420 jfree:
 421    for (m = message; PTRCMP(m, <, message + msgCount); ++m)
 422       free(m->m_maildir_file);
 423    NYD_LEAVE;
 424 }
 425
 426 static void
 427 _maildir_move(struct message *m)
 428 {
 429    char *fn, *new;
 430    NYD_ENTER;
 431
 432    fn = mkname(0, m->m_flag, m->m_maildir_file + 4);
 433    new = savecat("cur/", fn);
 434    if (!strcmp(m->m_maildir_file, new))
 435       goto jleave;
 436    if (link(m->m_maildir_file, new) == -1) {
 437       n_err(_("Cannot link %s to %s: message %lu not touched\n"),
 438          n_shexp_quote_cp(savecatsep(mailname, '/', m->m_maildir_file), FAL0),
 439          n_shexp_quote_cp(savecatsep(mailname, '/', new), FAL0),
 440          (ul_i)PTR2SIZE(m - message + 1));
 441       goto jleave;
 442    }
 443    if (unlink(m->m_maildir_file) == -1)
 444       n_err(_("Cannot unlink %s\n"),
 445          n_shexp_quote_cp(savecatsep(mailname, '/', m->m_maildir_file), FAL0));
 446 jleave:
 447    NYD_LEAVE;
 448 }
 449
 450 static char *
 451 mkname(time_t t, enum mflag f, char const *pref)
 452 {
 453    static unsigned long cnt;
 454    static pid_t mypid; /* XXX This should possibly be global, somehow */
 455    static char *node;
 456
 457    char *cp;
 458    int size, n, i;
 459    NYD_ENTER;
 460
 461    if (pref == NULL) {
 462       if (mypid == 0)
 463          mypid = getpid();
 464       if (node == NULL) {
 465          cp = nodename(0);
 466          n = size = 0;
 467          do {
 468             if (UICMP(32, n, <, size + 8))
 469                node = srealloc(node, size += 20);
 470             switch (*cp) {
 471             case '/':
 472                node[n++] = '\\', node[n++] = '0',
 473                node[n++] = '5', node[n++] = '7';
 474                break;
 475             case ':':
 476                node[n++] = '\\', node[n++] = '0',
 477                node[n++] = '7', node[n++] = '2';
 478                break;
 479             default:
 480                node[n++] = *cp;
 481             }
 482          } while (*cp++ != '\0');
 483       }
 484       size = 60 + strlen(node);
 485       cp = salloc(size);
 486       n = snprintf(cp, size, "%lu.%06lu_%06lu.%s:2,",
 487             (ul_i)t, (ul_i)mypid, ++cnt, node);
 488    } else {
 489       size = (n = strlen(pref)) + 13;
 490       cp = salloc(size);
 491       memcpy(cp, pref, n +1);
 492       for (i = n; i > 3; --i)
 493          if (cp[i - 1] == ',' && cp[i - 2] == '2' && cp[i - 3] == ':') {
 494             n = i;
 495             break;
 496          }
 497       if (i <= 3) {
 498          memcpy(cp + n, ":2,", 3 +1);
 499          n += 3;
 500       }
 501    }
 502    if (n < size - 7) {
 503       if (f & MDRAFTED)
 504          cp[n++] = 'D';
 505       if (f & MFLAGGED)
 506          cp[n++] = 'F';
 507       if (f & MANSWERED)
 508          cp[n++] = 'R';
 509       if (f & MREAD)
 510          cp[n++] = 'S';
 511       if (f & MDELETED)
 512          cp[n++] = 'T';
 513       cp[n] = '\0';
 514    }
 515    NYD_LEAVE;
 516    return cp;
 517 }
 518
 519 static enum okay
 520 maildir_append1(char const *name, FILE *fp, off_t off1, long size,
 521    enum mflag flag)
 522 {
 523    char buf[4096], *fn, *tfn, *nfn;
 524    struct stat st;
 525    FILE *op;
 526    time_t now;
 527    size_t nlen, flen, n;
 528    enum okay rv = STOP;
 529    NYD_ENTER;
 530
 531    nlen = strlen(name);
 532
 533    /* Create a unique temporary file */
 534    for (nfn = (char*)0xA /* XXX no magic */;; n_msleep(500, FAL0)) {
 535       now = n_time_epoch();
 536       flen = strlen(fn = mkname(now, flag, NULL));
 537       tfn = salloc(n = nlen + flen + 6);
 538       snprintf(tfn, n, "%s/tmp/%s", name, fn);
 539
 540       /* Use "wx" for O_EXCL XXX stat(2) rather redundant; coverity:TOCTOU */
 541       if ((!stat(tfn, &st) || errno == ENOENT) &&
 542             (op = Fopen(tfn, "wx")) != NULL)
 543          break;
 544
 545       nfn = (char*)(PTR2SIZE(nfn) - 1);
 546       if (nfn == NULL) {
 547          n_err(_("Can't create an unique file name in %s\n"),
 548             n_shexp_quote_cp(savecat(name, "/tmp"), FAL0));
 549          goto jleave;
 550       }
 551    }
 552
 553    if (fseek(fp, off1, SEEK_SET) == -1)
 554       goto jtmperr;
 555    while (size > 0) {
 556       size_t z = UICMP(z, size, >, sizeof buf) ? sizeof buf : (size_t)size;
 557
 558       if (z != (n = fread(buf, 1, z, fp)) || n != fwrite(buf, 1, n, op)) {
 559 jtmperr:
 560          n_err(_("Error writing to %s\n"), n_shexp_quote_cp(tfn, FAL0));
 561          Fclose(op);
 562          goto jerr;
 563       }
 564       size -= n;
 565    }
 566    Fclose(op);
 567
 568    nfn = salloc(n = nlen + flen + 6);
 569    snprintf(nfn, n, "%s/new/%s", name, fn);
 570    if (link(tfn, nfn) == -1) {
 571       n_err(_("Cannot link %s to %s\n"), n_shexp_quote_cp(tfn, FAL0),
 572          n_shexp_quote_cp(nfn, FAL0));
 573       goto jerr;
 574    }
 575    rv = OKAY;
 576 jerr:
 577    if (unlink(tfn) == -1)
 578       n_err(_("Cannot unlink %s\n"), n_shexp_quote_cp(tfn, FAL0));
 579 jleave:
 580    NYD_LEAVE;
 581    return rv;
 582 }
 583
 584 static enum okay
 585 trycreate(char const *name)
 586 {
 587    struct stat st;
 588    enum okay rv = STOP;
 589    NYD_ENTER;
 590
 591    if (!stat(name, &st)) {
 592       if (!S_ISDIR(st.st_mode)) {
 593          n_err(_("%s is not a directory\n"), n_shexp_quote_cp(name, FAL0));
 594          goto jleave;
 595       }
 596    } else if (!n_path_mkdir(name)) {
 597       n_err(_("Cannot create directory %s\n"), n_shexp_quote_cp(name, FAL0));
 598       goto jleave;
 599    }
 600    rv = OKAY;
 601 jleave:
 602    NYD_LEAVE;
 603    return rv;
 604 }
 605
 606 static enum okay
 607 mkmaildir(char const *name) /* TODO proper cleanup on error; use path[] loop */
 608 {
 609    char *np;
 610    size_t sz;
 611    enum okay rv = STOP;
 612    NYD_ENTER;
 613
 614    if (trycreate(name) == OKAY) {
 615       np = ac_alloc((sz = strlen(name)) + 4 +1);
 616       memcpy(np, name, sz);
 617       memcpy(np + sz, "/tmp", 4 +1);
 618       if (trycreate(np) == OKAY) {
 619          memcpy(np + sz, "/new", 4 +1);
 620          if (trycreate(np) == OKAY) {
 621             memcpy(np + sz, "/cur", 4 +1);
 622             rv = trycreate(np);
 623          }
 624       }
 625       ac_free(np);
 626    }
 627    NYD_LEAVE;
 628    return rv;
 629 }
 630
 631 static struct message *
 632 mdlook(char const *name, struct message *data)
 633 {
 634    struct mditem *md;
 635    ui32_t c, h, n = 0;
 636    NYD_ENTER;
 637
 638    if (data && data->m_maildir_hash)
 639       h = ~data->m_maildir_hash;
 640    else
 641       h = a_maildir_hash(name);
 642    h %= _maildir_prime;
 643    c = h;
 644    md = _maildir_table + c;
 645
 646    while (md->md_data != NULL) {
 647       if (!strcmp(md->md_data->m_maildir_file + 4, name))
 648          break;
 649       c += (n & 1) ? -((n+1)/2) * ((n+1)/2) : ((n+1)/2) * ((n+1)/2);
 650       n++;
 651       while (c >= _maildir_prime)
 652          c -= _maildir_prime;
 653       md = _maildir_table + c;
 654    }
 655    if (data != NULL && md->md_data == NULL)
 656       md->md_data = data;
 657    NYD_LEAVE;
 658    return md->md_data;
 659 }
 660
 661 static void
 662 mktable(void)
 663 {
 664    struct message *mp;
 665    size_t i;
 666    NYD_ENTER;
 667
 668    _maildir_prime = nextprime(msgCount);
 669    _maildir_table = scalloc(_maildir_prime, sizeof *_maildir_table);
 670    for (mp = message, i = msgCount; i-- != 0; ++mp)
 671       mdlook(mp->m_maildir_file + 4, mp);
 672    NYD_LEAVE;
 673 }
 674
 675 static enum okay
 676 subdir_remove(char const *name, char const *sub)
 677 {
 678    char *path;
 679    int pathsize, pathend, namelen, sublen, n;
 680    DIR *dirp;
 681    struct dirent *dp;
 682    enum okay rv = STOP;
 683    NYD_ENTER;
 684
 685    namelen = strlen(name);
 686    sublen = strlen(sub);
 687    path = smalloc(pathsize = namelen + sublen + 30 +1);
 688    memcpy(path, name, namelen);
 689    path[namelen] = '/';
 690    memcpy(path + namelen + 1, sub, sublen);
 691    path[namelen + sublen + 1] = '/';
 692    path[pathend = namelen + sublen + 2] = '\0';
 693
 694    if ((dirp = opendir(path)) == NULL) {
 695       n_perr(path, 0);
 696       goto jleave;
 697    }
 698    while ((dp = readdir(dirp)) != NULL) {
 699       if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' ||
 700             (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
 701          continue;
 702       if (dp->d_name[0] == '.')
 703          continue;
 704       n = strlen(dp->d_name);
 705       if (UICMP(32, pathend + n +1, >, pathsize))
 706          path = srealloc(path, pathsize = pathend + n + 30);
 707       memcpy(path + pathend, dp->d_name, n +1);
 708       if (unlink(path) == -1) {
 709          n_perr(path, 0);
 710          closedir(dirp);
 711          goto jleave;
 712       }
 713    }
 714    closedir(dirp);
 715
 716    path[pathend] = '\0';
 717    if (rmdir(path) == -1) {
 718       n_perr(path, 0);
 719       goto jleave;
 720    }
 721    rv = OKAY;
 722 jleave:
 723    free(path);
 724    NYD_LEAVE;
 725    return rv;
 726 }
 727
 728 FL int
 729 maildir_setfile(char const * volatile name, enum fedit_mode fm)
 730 {
 731    sighandler_type volatile saveint;
 732    struct cw cw;
 733    int omsgCount;
 734    int volatile i = -1;
 735    NYD_ENTER;
 736
 737    omsgCount = msgCount;
 738    if (cwget(&cw) == STOP) {
 739       n_alert(_("Cannot open current directory"));
 740       goto jleave;
 741    }
 742
 743    if (!(fm & FEDIT_NEWMAIL) && !quit(FAL0))
 744       goto jleave;
 745
 746    saveint = safe_signal(SIGINT, SIG_IGN);
 747
 748    if (!(fm & FEDIT_NEWMAIL)) {
 749       if (fm & FEDIT_SYSBOX)
 750          n_pstate &= ~n_PS_EDIT;
 751       else
 752          n_pstate |= n_PS_EDIT;
 753       if (mb.mb_itf) {
 754          fclose(mb.mb_itf);
 755          mb.mb_itf = NULL;
 756       }
 757       if (mb.mb_otf) {
 758          fclose(mb.mb_otf);
 759          mb.mb_otf = NULL;
 760       }
 761       initbox(name);
 762       mb.mb_type = MB_MAILDIR;
 763    }
 764
 765    if (chdir(name) < 0) {
 766       n_err(_("Cannot change directory to %s\n"), n_shexp_quote_cp(name, FAL0));
 767       mb.mb_type = MB_VOID;
 768       *mailname = '\0';
 769       msgCount = 0;
 770       cwrelse(&cw);
 771       safe_signal(SIGINT, saveint);
 772       goto jleave;
 773    }
 774
 775    _maildir_table = NULL;
 776    if (sigsetjmp(_maildir_jmp, 1) == 0) {
 777       if (fm & FEDIT_NEWMAIL)
 778          mktable();
 779       if (saveint != SIG_IGN)
 780          safe_signal(SIGINT, &__maildircatch);
 781       i = _maildir_setfile1(name, fm, omsgCount);
 782    }
 783    if ((fm & FEDIT_NEWMAIL) && _maildir_table != NULL)
 784       free(_maildir_table);
 785
 786    safe_signal(SIGINT, saveint);
 787
 788    if (i < 0) {
 789       mb.mb_type = MB_VOID;
 790       *mailname = '\0';
 791       msgCount = 0;
 792    }
 793
 794    if (cwret(&cw) == STOP)
 795       n_panic(_("Cannot change back to current directory"));
 796    cwrelse(&cw);
 797
 798    setmsize(msgCount);
 799    if ((fm & FEDIT_NEWMAIL) && mb.mb_sorted && msgCount > omsgCount) {
 800       mb.mb_threaded = 0;
 801       c_sort((void*)-1);
 802    }
 803
 804    if (!(fm & FEDIT_NEWMAIL)) {
 805       n_pstate &= ~n_PS_SAW_COMMAND;
 806       n_pstate |= n_PS_SETFILE_OPENED;
 807    }
 808
 809    if ((n_poption & n_PO_EXISTONLY) && !(n_poption & n_PO_HEADERLIST)) {
 810       i = (msgCount == 0);
 811       goto jleave;
 812    }
 813
 814    if (!(fm & FEDIT_NEWMAIL) && (fm & FEDIT_SYSBOX) && msgCount == 0) {
 815       if (mb.mb_type == MB_MAILDIR /* XXX ?? */ && !ok_blook(emptystart))
 816          n_err(_("No mail at %s\n"), n_shexp_quote_cp(name, FAL0));
 817       i = 1;
 818       goto jleave;
 819    }
 820
 821    if ((fm & FEDIT_NEWMAIL) && msgCount > omsgCount)
 822       newmailinfo(omsgCount);
 823    i = 0;
 824 jleave:
 825    NYD_LEAVE;
 826    return i;
 827 }
 828
 829 FL bool_t
 830 maildir_quit(bool_t hold_sigs_on)
 831 {
 832    sighandler_type saveint;
 833    struct cw cw;
 834    bool_t rv;
 835    NYD_ENTER;
 836
 837    if(hold_sigs_on)
 838       rele_sigs();
 839
 840    rv = FAL0;
 841
 842    if (cwget(&cw) == STOP) {
 843       n_alert(_("Cannot open current directory"));
 844       goto jleave;
 845    }
 846
 847    saveint = safe_signal(SIGINT, SIG_IGN);
 848
 849    if (chdir(mailname) == -1) {
 850       n_err(_("Cannot change directory to %s\n"),
 851          n_shexp_quote_cp(mailname, FAL0));
 852       cwrelse(&cw);
 853       safe_signal(SIGINT, saveint);
 854       goto jleave;
 855    }
 856
 857    if (sigsetjmp(_maildir_jmp, 1) == 0) {
 858       if (saveint != SIG_IGN)
 859          safe_signal(SIGINT, &__maildircatch_hold);
 860       maildir_update();
 861    }
 862
 863    safe_signal(SIGINT, saveint);
 864
 865    if (cwret(&cw) == STOP)
 866       n_panic(_("Cannot change back to current directory"));
 867    cwrelse(&cw);
 868    rv = TRU1;
 869 jleave:
 870    if(hold_sigs_on)
 871       hold_sigs();
 872    NYD_LEAVE;
 873    return rv;
 874 }
 875
 876 FL enum okay
 877 maildir_append(char const *name, FILE *fp, long offset)
 878 {
 879    char *buf, *bp, *lp;
 880    size_t bufsize, buflen, cnt;
 881    off_t off1 = -1, offs;
 882    long size;
 883    int flag;
 884    enum {_NONE = 0, _INHEAD = 1<<0, _NLSEP = 1<<1} state;
 885    enum okay rv;
 886    NYD_ENTER;
 887
 888    if ((rv = mkmaildir(name)) != OKAY)
 889       goto jleave;
 890
 891    buf = smalloc(bufsize = LINESIZE); /* TODO line pool; signals */
 892    buflen = 0;
 893    cnt = fsize(fp);
 894    offs = offset /* BSD will move due to O_APPEND! ftell(fp) */;
 895    size = 0;
 896
 897    srelax_hold();
 898    for (flag = MNEW, state = _NLSEP;;) {
 899       bp = fgetline(&buf, &bufsize, &cnt, &buflen, fp, 1);
 900
 901       if (bp == NULL ||
 902             ((state & (_INHEAD | _NLSEP)) == _NLSEP &&
 903              is_head(buf, buflen, FAL0))) {
 904          if (off1 != (off_t)-1) {
 905             if ((rv = maildir_append1(name, fp, off1, size, flag)) == STOP)
 906                goto jfree;
 907             srelax();
 908             if (fseek(fp, offs + buflen, SEEK_SET) == -1) {
 909                rv = STOP;
 910                goto jfree;
 911             }
 912          }
 913          off1 = offs + buflen;
 914          size = 0;
 915          state = _INHEAD;
 916          flag = MNEW;
 917
 918          if (bp == NULL)
 919             break;
 920       } else
 921          size += buflen;
 922       offs += buflen;
 923
 924       state &= ~_NLSEP;
 925       if (buf[0] == '\n') {
 926          state &= ~_INHEAD;
 927          state |= _NLSEP;
 928       } else if (state & _INHEAD) {
 929          if (!ascncasecmp(buf, "status", 6)) {
 930             lp = buf + 6;
 931             while (whitechar(*lp))
 932                ++lp;
 933             if (*lp == ':')
 934                while (*++lp != '\0')
 935                   switch (*lp) {
 936                   case 'R':
 937                      flag |= MREAD;
 938                      break;
 939                   case 'O':
 940                      flag &= ~MNEW;
 941                      break;
 942                   }
 943          } else if (!ascncasecmp(buf, "x-status", 8)) {
 944             lp = buf + 8;
 945             while (whitechar(*lp))
 946                ++lp;
 947             if (*lp == ':') {
 948                while (*++lp != '\0')
 949                   switch (*lp) {
 950                   case 'F':
 951                      flag |= MFLAGGED;
 952                      break;
 953                   case 'A':
 954                      flag |= MANSWERED;
 955                      break;
 956                   case 'T':
 957                      flag |= MDRAFTED;
 958                      break;
 959                   }
 960             }
 961          }
 962       }
 963    }
 964    assert(rv == OKAY);
 965 jfree:
 966    srelax_rele();
 967    free(buf);
 968 jleave:
 969    NYD_LEAVE;
 970    return rv;
 971 }
 972
 973 FL enum okay
 974 maildir_remove(char const *name)
 975 {
 976    enum okay rv = STOP;
 977    NYD_ENTER;
 978
 979    if (subdir_remove(name, "tmp") == STOP ||
 980          subdir_remove(name, "new") == STOP ||
 981          subdir_remove(name, "cur") == STOP)
 982       goto jleave;
 983    if (rmdir(name) == -1) {
 984       n_perr(name, 0);
 985       goto jleave;
 986    }
 987    rv = OKAY;
 988 jleave:
 989    NYD_LEAVE;
 990    return rv;
 991 }
 992
 993 /* s-it-mode */