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 - 2016 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    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 = ((options & OPT_R_FLAG) || (fm & FEDIT_RDONLY)) ? 0 : MB_DELE;
 177    if ((i = _maildir_subdir(name, "cur", fm)) != 0)
 178       goto jleave;
 179    if ((i = _maildir_subdir(name, "new", fm)) != 0)
 180       goto jleave;
 181    _maildir_append(name, NULL, NULL);
 182
 183    srelax_hold();
 184    for (i = ((fm & FEDIT_NEWMAIL) ? omsgCount : 0); i < msgCount; ++i) {
 185       readin(name, message + i);
 186       srelax();
 187    }
 188    srelax_rele();
 189
 190    if (fm & FEDIT_NEWMAIL) {
 191       if (msgCount > omsgCount)
 192          qsort(&message[omsgCount], msgCount - omsgCount, sizeof *message,
 193             &mdcmp);
 194    } else if (msgCount)
 195       qsort(message, msgCount, sizeof *message, &mdcmp);
 196    i = msgCount;
 197 jleave:
 198    NYD_LEAVE;
 199    return i;
 200 }
 201
 202 static int
 203 mdcmp(void const *a, void const *b)
 204 {
 205    struct message const *mpa = a, *mpb = b;
 206    long i;
 207    NYD_ENTER;
 208
 209    if ((i = mpa->m_time - mpb->m_time) == 0)
 210       i = strcmp(mpa->m_maildir_file + 4, mpb->m_maildir_file + 4);
 211    NYD_LEAVE;
 212    return i;
 213 }
 214
 215 static int
 216 _maildir_subdir(char const *name, char const *sub, enum fedit_mode fm)
 217 {
 218    DIR *dirp;
 219    struct dirent *dp;
 220    int rv;
 221    NYD_ENTER;
 222
 223    if ((dirp = opendir(sub)) == NULL) {
 224       n_err(_("Cannot open directory %s\n"),
 225          n_shexp_quote_cp(savecatsep(name, '/', sub), FAL0));
 226       rv = -1;
 227       goto jleave;
 228    }
 229    if (access(sub, W_OK) == -1)
 230       mb.mb_perm = 0;
 231    while ((dp = readdir(dirp)) != NULL) {
 232       if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' ||
 233             (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
 234          continue;
 235       if (dp->d_name[0] == '.')
 236          continue;
 237       if (!(fm & FEDIT_NEWMAIL) || mdlook(dp->d_name, NULL) == NULL)
 238          _maildir_append(name, sub, dp->d_name);
 239    }
 240    closedir(dirp);
 241    rv = 0;
 242 jleave:
 243    NYD_LEAVE;
 244    return rv;
 245 }
 246
 247 static void
 248 _maildir_append(char const *name, char const *sub, char const *fn)
 249 {
 250    struct message *m;
 251    size_t sz, i;
 252    time_t t = 0;
 253    enum mflag f = MUSED | MNOFROM | MNEWEST;
 254    char const *cp;
 255    char *xp;
 256    NYD_ENTER;
 257    UNUSED(name);
 258
 259    if (fn != NULL && sub != NULL) {
 260       if (!strcmp(sub, "new"))
 261          f |= MNEW;
 262       t = strtol(fn, &xp, 10);
 263       if ((cp = strrchr(xp, ',')) != NULL && PTRCMP(cp, >, xp + 2) &&
 264             cp[-1] == '2' && cp[-2] == ':') {
 265          while (*++cp != '\0') {
 266             switch (*cp) {
 267             case 'F':
 268                f |= MFLAGGED;
 269                break;
 270             case 'R':
 271                f |= MANSWERED;
 272                break;
 273             case 'S':
 274                f |= MREAD;
 275                break;
 276             case 'T':
 277                f |= MDELETED;
 278                break;
 279             case 'D':
 280                f |= MDRAFT;
 281                break;
 282             }
 283          }
 284       }
 285    }
 286
 287    /* Ensure room (and a NULLified last entry) */
 288    ++msgCount;
 289    message_append(NULL);
 290    --msgCount;
 291
 292    if (fn == NULL || sub == NULL)
 293       goto jleave;
 294
 295    m = message + msgCount++;
 296    i = strlen(fn);
 297    m->m_maildir_file = smalloc((sz = strlen(sub)) + i + 1 +1);
 298    memcpy(m->m_maildir_file, sub, sz);
 299    m->m_maildir_file[sz] = '/';
 300    memcpy(m->m_maildir_file + sz + 1, fn, i +1);
 301    m->m_time = t;
 302    m->m_flag = f;
 303    m->m_maildir_hash = ~a_maildir_hash(fn);
 304 jleave:
 305    NYD_LEAVE;
 306    return;
 307 }
 308
 309 static void
 310 readin(char const *name, struct message *m)
 311 {
 312    char *buf;
 313    size_t bufsize, buflen, cnt;
 314    long size = 0, lines = 0;
 315    off_t offset;
 316    FILE *fp;
 317    int emptyline = 0;
 318    NYD_ENTER;
 319
 320    if ((fp = Fopen(m->m_maildir_file, "r")) == NULL) {
 321       n_err(_("Cannot read %s for message %lu\n"),
 322          n_shexp_quote_cp(savecatsep(name, '/', m->m_maildir_file), FAL0),
 323          (ul_i)PTR2SIZE(m - message + 1));
 324       m->m_flag |= MHIDDEN;
 325       goto jleave;
 326    }
 327
 328    cnt = fsize(fp);
 329    fseek(mb.mb_otf, 0L, SEEK_END);
 330    offset = ftell(mb.mb_otf);
 331    buf = smalloc(bufsize = LINESIZE);
 332    buflen = 0;
 333    while (fgetline(&buf, &bufsize, &cnt, &buflen, fp, 1) != NULL) {
 334       /* Since we simply copy over data without doing any transfer
 335        * encoding reclassification/adjustment we *have* to perform
 336        * RFC 4155 compliant From_ quoting here */
 337       if (emptyline && is_head(buf, buflen, FAL0)) {
 338          putc('>', mb.mb_otf);
 339          ++size;
 340       }
 341       size += fwrite(buf, 1, buflen, mb.mb_otf);/*XXX err hdling*/
 342       emptyline = (*buf == '\n');
 343       ++lines;
 344    }
 345    free(buf);
 346    if (!emptyline) {
 347       putc('\n', mb.mb_otf);
 348       ++lines;
 349       ++size;
 350    }
 351
 352    Fclose(fp);
 353    fflush(mb.mb_otf);
 354    m->m_size = m->m_xsize = size;
 355    m->m_lines = m->m_xlines = lines;
 356    m->m_block = mailx_blockof(offset);
 357    m->m_offset = mailx_offsetof(offset);
 358    substdate(m);
 359 jleave:
 360    NYD_LEAVE;
 361 }
 362
 363 static void
 364 maildir_update(void)
 365 {
 366    struct message *m;
 367    int dodel, c, gotcha = 0, held = 0, modflags = 0;
 368    NYD_ENTER;
 369
 370    if (mb.mb_perm == 0)
 371       goto jfree;
 372
 373    if (!(pstate & PS_EDIT)) {
 374       holdbits();
 375       for (m = message, c = 0; PTRCMP(m, <, message + msgCount); ++m) {
 376          if (m->m_flag & MBOX)
 377             c++;
 378       }
 379       if (c > 0)
 380          if (makembox() == STOP)
 381             goto jbypass;
 382    }
 383    for (m = message, gotcha = 0, held = 0; PTRCMP(m, <, message + msgCount);
 384          ++m) {
 385       if (pstate & PS_EDIT)
 386          dodel = m->m_flag & MDELETED;
 387       else
 388          dodel = !((m->m_flag & MPRESERVE) || !(m->m_flag & MTOUCH));
 389       if (dodel) {
 390          if (unlink(m->m_maildir_file) < 0)
 391             n_err(_("Cannot delete file %s for message %lu\n"),
 392                n_shexp_quote_cp(savecatsep(mailname, '/', m->m_maildir_file),
 393                   FAL0), (ul_i)PTR2SIZE(m - message + 1));
 394          else
 395             ++gotcha;
 396       } else {
 397          if ((m->m_flag & (MREAD | MSTATUS)) == (MREAD | MSTATUS) ||
 398                (m->m_flag & (MNEW | MBOXED | MSAVED | MSTATUS | MFLAG |
 399                MUNFLAG | MANSWER | MUNANSWER | MDRAFT | MUNDRAFT))) {
 400             _maildir_move(m);
 401             ++modflags;
 402          }
 403          ++held;
 404       }
 405    }
 406 jbypass:
 407    if ((gotcha || modflags) && (pstate & PS_EDIT)) {
 408       printf(_("%s "), n_shexp_quote_cp(displayname, FAL0));
 409       printf((ok_blook(bsdcompat) || ok_blook(bsdmsgs))
 410          ? _("complete\n") : _("updated.\n"));
 411    } else if (held && !(pstate & PS_EDIT) && mb.mb_perm != 0) {
 412       if (held == 1)
 413          printf(_("Held 1 message in %s\n"), displayname);
 414       else
 415          printf(_("Held %d messages in %s\n"), held, displayname);
 416    }
 417    fflush(stdout);
 418 jfree:
 419    for (m = message; PTRCMP(m, <, message + msgCount); ++m)
 420       free(m->m_maildir_file);
 421    NYD_LEAVE;
 422 }
 423
 424 static void
 425 _maildir_move(struct message *m)
 426 {
 427    char *fn, *new;
 428    NYD_ENTER;
 429
 430    fn = mkname(0, m->m_flag, m->m_maildir_file + 4);
 431    new = savecat("cur/", fn);
 432    if (!strcmp(m->m_maildir_file, new))
 433       goto jleave;
 434    if (link(m->m_maildir_file, new) == -1) {
 435       n_err(_("Cannot link %s to %s: message %lu not touched\n"),
 436          n_shexp_quote_cp(savecatsep(mailname, '/', m->m_maildir_file), FAL0),
 437          n_shexp_quote_cp(savecatsep(mailname, '/', new), FAL0),
 438          (ul_i)PTR2SIZE(m - message + 1));
 439       goto jleave;
 440    }
 441    if (unlink(m->m_maildir_file) == -1)
 442       n_err(_("Cannot unlink %s\n"),
 443          n_shexp_quote_cp(savecatsep(mailname, '/', m->m_maildir_file), FAL0));
 444 jleave:
 445    NYD_LEAVE;
 446 }
 447
 448 static char *
 449 mkname(time_t t, enum mflag f, char const *pref)
 450 {
 451    static unsigned long cnt;
 452    static pid_t mypid; /* XXX This should possibly be global, somehow */
 453    static char *node;
 454
 455    char *cp;
 456    int size, n, i;
 457    NYD_ENTER;
 458
 459    if (pref == NULL) {
 460       if (mypid == 0)
 461          mypid = getpid();
 462       if (node == NULL) {
 463          cp = nodename(0);
 464          n = size = 0;
 465          do {
 466             if (UICMP(32, n, <, size + 8))
 467                node = srealloc(node, size += 20);
 468             switch (*cp) {
 469             case '/':
 470                node[n++] = '\\', node[n++] = '0',
 471                node[n++] = '5', node[n++] = '7';
 472                break;
 473             case ':':
 474                node[n++] = '\\', node[n++] = '0',
 475                node[n++] = '7', node[n++] = '2';
 476                break;
 477             default:
 478                node[n++] = *cp;
 479             }
 480          } while (*cp++ != '\0');
 481       }
 482       size = 60 + strlen(node);
 483       cp = salloc(size);
 484       n = snprintf(cp, size, "%lu.%06lu_%06lu.%s:2,",
 485             (ul_i)t, (ul_i)mypid, ++cnt, node);
 486    } else {
 487       size = (n = strlen(pref)) + 13;
 488       cp = salloc(size);
 489       memcpy(cp, pref, n +1);
 490       for (i = n; i > 3; --i)
 491          if (cp[i - 1] == ',' && cp[i - 2] == '2' && cp[i - 3] == ':') {
 492             n = i;
 493             break;
 494          }
 495       if (i <= 3) {
 496          memcpy(cp + n, ":2,", 3 +1);
 497          n += 3;
 498       }
 499    }
 500    if (n < size - 7) {
 501       if (f & MDRAFTED)
 502          cp[n++] = 'D';
 503       if (f & MFLAGGED)
 504          cp[n++] = 'F';
 505       if (f & MANSWERED)
 506          cp[n++] = 'R';
 507       if (f & MREAD)
 508          cp[n++] = 'S';
 509       if (f & MDELETED)
 510          cp[n++] = 'T';
 511       cp[n] = '\0';
 512    }
 513    NYD_LEAVE;
 514    return cp;
 515 }
 516
 517 static enum okay
 518 maildir_append1(char const *name, FILE *fp, off_t off1, long size,
 519    enum mflag flag)
 520 {
 521    char buf[4096], *fn, *tfn, *nfn;
 522    struct stat st;
 523    FILE *op;
 524    time_t now;
 525    size_t nlen, flen, n;
 526    enum okay rv = STOP;
 527    NYD_ENTER;
 528
 529    nlen = strlen(name);
 530
 531    /* Create a unique temporary file */
 532    for (nfn = (char*)0xA /* XXX no magic */;; n_msleep(500, FAL0)) {
 533       now = n_time_epoch();
 534       flen = strlen(fn = mkname(now, flag, NULL));
 535       tfn = salloc(n = nlen + flen + 6);
 536       snprintf(tfn, n, "%s/tmp/%s", name, fn);
 537
 538       /* Use "wx" for O_EXCL XXX stat(2) rather redundant; coverity:TOCTOU */
 539       if ((!stat(tfn, &st) || errno == ENOENT) &&
 540             (op = Fopen(tfn, "wx")) != NULL)
 541          break;
 542
 543       nfn = (char*)(PTR2SIZE(nfn) - 1);
 544       if (nfn == NULL) {
 545          n_err(_("Can't create an unique file name in %s\n"),
 546             n_shexp_quote_cp(savecat(name, "/tmp"), FAL0));
 547          goto jleave;
 548       }
 549    }
 550
 551    if (fseek(fp, off1, SEEK_SET) == -1)
 552       goto jtmperr;
 553    while (size > 0) {
 554       size_t z = UICMP(z, size, >, sizeof buf) ? sizeof buf : (size_t)size;
 555
 556       if (z != (n = fread(buf, 1, z, fp)) || n != fwrite(buf, 1, n, op)) {
 557 jtmperr:
 558          n_err(_("Error writing to %s\n"), n_shexp_quote_cp(tfn, FAL0));
 559          Fclose(op);
 560          goto jerr;
 561       }
 562       size -= n;
 563    }
 564    Fclose(op);
 565
 566    nfn = salloc(n = nlen + flen + 6);
 567    snprintf(nfn, n, "%s/new/%s", name, fn);
 568    if (link(tfn, nfn) == -1) {
 569       n_err(_("Cannot link %s to %s\n"), n_shexp_quote_cp(tfn, FAL0),
 570          n_shexp_quote_cp(nfn, FAL0));
 571       goto jerr;
 572    }
 573    rv = OKAY;
 574 jerr:
 575    if (unlink(tfn) == -1)
 576       n_err(_("Cannot unlink %s\n"), n_shexp_quote_cp(tfn, FAL0));
 577 jleave:
 578    NYD_LEAVE;
 579    return rv;
 580 }
 581
 582 static enum okay
 583 trycreate(char const *name)
 584 {
 585    struct stat st;
 586    enum okay rv = STOP;
 587    NYD_ENTER;
 588
 589    if (!stat(name, &st)) {
 590       if (!S_ISDIR(st.st_mode)) {
 591          n_err(_("%s is not a directory\n"), n_shexp_quote_cp(name, FAL0));
 592          goto jleave;
 593       }
 594    } else if (!n_path_mkdir(name)) {
 595       n_err(_("Cannot create directory %s\n"), n_shexp_quote_cp(name, FAL0));
 596       goto jleave;
 597    }
 598    rv = OKAY;
 599 jleave:
 600    NYD_LEAVE;
 601    return rv;
 602 }
 603
 604 static enum okay
 605 mkmaildir(char const *name) /* TODO proper cleanup on error; use path[] loop */
 606 {
 607    char *np;
 608    size_t sz;
 609    enum okay rv = STOP;
 610    NYD_ENTER;
 611
 612    if (trycreate(name) == OKAY) {
 613       np = ac_alloc((sz = strlen(name)) + 4 +1);
 614       memcpy(np, name, sz);
 615       memcpy(np + sz, "/tmp", 4 +1);
 616       if (trycreate(np) == OKAY) {
 617          memcpy(np + sz, "/new", 4 +1);
 618          if (trycreate(np) == OKAY) {
 619             memcpy(np + sz, "/cur", 4 +1);
 620             rv = trycreate(np);
 621          }
 622       }
 623       ac_free(np);
 624    }
 625    NYD_LEAVE;
 626    return rv;
 627 }
 628
 629 static struct message *
 630 mdlook(char const *name, struct message *data)
 631 {
 632    struct mditem *md;
 633    ui32_t c, h, n = 0;
 634    NYD_ENTER;
 635
 636    if (data && data->m_maildir_hash)
 637       h = ~data->m_maildir_hash;
 638    else
 639       h = a_maildir_hash(name);
 640    h %= _maildir_prime;
 641    c = h;
 642    md = _maildir_table + c;
 643
 644    while (md->md_data != NULL) {
 645       if (!strcmp(md->md_data->m_maildir_file + 4, name))
 646          break;
 647       c += (n & 1) ? -((n+1)/2) * ((n+1)/2) : ((n+1)/2) * ((n+1)/2);
 648       n++;
 649       while (c >= _maildir_prime)
 650          c -= _maildir_prime;
 651       md = _maildir_table + c;
 652    }
 653    if (data != NULL && md->md_data == NULL)
 654       md->md_data = data;
 655    NYD_LEAVE;
 656    return md->md_data;
 657 }
 658
 659 static void
 660 mktable(void)
 661 {
 662    struct message *mp;
 663    size_t i;
 664    NYD_ENTER;
 665
 666    _maildir_prime = nextprime(msgCount);
 667    _maildir_table = scalloc(_maildir_prime, sizeof *_maildir_table);
 668    for (mp = message, i = msgCount; i-- != 0; ++mp)
 669       mdlook(mp->m_maildir_file + 4, mp);
 670    NYD_LEAVE;
 671 }
 672
 673 static enum okay
 674 subdir_remove(char const *name, char const *sub)
 675 {
 676    char *path;
 677    int pathsize, pathend, namelen, sublen, n;
 678    DIR *dirp;
 679    struct dirent *dp;
 680    enum okay rv = STOP;
 681    NYD_ENTER;
 682
 683    namelen = strlen(name);
 684    sublen = strlen(sub);
 685    path = smalloc(pathsize = namelen + sublen + 30 +1);
 686    memcpy(path, name, namelen);
 687    path[namelen] = '/';
 688    memcpy(path + namelen + 1, sub, sublen);
 689    path[namelen + sublen + 1] = '/';
 690    path[pathend = namelen + sublen + 2] = '\0';
 691
 692    if ((dirp = opendir(path)) == NULL) {
 693       n_perr(path, 0);
 694       goto jleave;
 695    }
 696    while ((dp = readdir(dirp)) != NULL) {
 697       if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' ||
 698             (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
 699          continue;
 700       if (dp->d_name[0] == '.')
 701          continue;
 702       n = strlen(dp->d_name);
 703       if (UICMP(32, pathend + n +1, >, pathsize))
 704          path = srealloc(path, pathsize = pathend + n + 30);
 705       memcpy(path + pathend, dp->d_name, n +1);
 706       if (unlink(path) == -1) {
 707          n_perr(path, 0);
 708          closedir(dirp);
 709          goto jleave;
 710       }
 711    }
 712    closedir(dirp);
 713
 714    path[pathend] = '\0';
 715    if (rmdir(path) == -1) {
 716       n_perr(path, 0);
 717       goto jleave;
 718    }
 719    rv = OKAY;
 720 jleave:
 721    free(path);
 722    NYD_LEAVE;
 723    return rv;
 724 }
 725
 726 FL int
 727 maildir_setfile(char const * volatile name, enum fedit_mode fm)
 728 {
 729    sighandler_type volatile saveint;
 730    struct cw cw;
 731    int omsgCount;
 732    int volatile i = -1;
 733    NYD_ENTER;
 734
 735    omsgCount = msgCount;
 736    if (cwget(&cw) == STOP) {
 737       n_alert(_("Cannot open current directory"));
 738       goto jleave;
 739    }
 740
 741    if (!(fm & FEDIT_NEWMAIL) && !quit())
 742       goto jleave;
 743
 744    saveint = safe_signal(SIGINT, SIG_IGN);
 745
 746    if (!(fm & FEDIT_NEWMAIL)) {
 747       if (fm & FEDIT_SYSBOX)
 748          pstate &= ~PS_EDIT;
 749       else
 750          pstate |= PS_EDIT;
 751       if (mb.mb_itf) {
 752          fclose(mb.mb_itf);
 753          mb.mb_itf = NULL;
 754       }
 755       if (mb.mb_otf) {
 756          fclose(mb.mb_otf);
 757          mb.mb_otf = NULL;
 758       }
 759       initbox(name);
 760       mb.mb_type = MB_MAILDIR;
 761    }
 762
 763    if (chdir(name) < 0) {
 764       n_err(_("Cannot change directory to %s\n"), n_shexp_quote_cp(name, FAL0));
 765       mb.mb_type = MB_VOID;
 766       *mailname = '\0';
 767       msgCount = 0;
 768       cwrelse(&cw);
 769       safe_signal(SIGINT, saveint);
 770       goto jleave;
 771    }
 772
 773    _maildir_table = NULL;
 774    if (sigsetjmp(_maildir_jmp, 1) == 0) {
 775       if (fm & FEDIT_NEWMAIL)
 776          mktable();
 777       if (saveint != SIG_IGN)
 778          safe_signal(SIGINT, &__maildircatch);
 779       i = _maildir_setfile1(name, fm, omsgCount);
 780    }
 781    if ((fm & FEDIT_NEWMAIL) && _maildir_table != NULL)
 782       free(_maildir_table);
 783
 784    safe_signal(SIGINT, saveint);
 785
 786    if (i < 0) {
 787       mb.mb_type = MB_VOID;
 788       *mailname = '\0';
 789       msgCount = 0;
 790    }
 791
 792    if (cwret(&cw) == STOP)
 793       n_panic(_("Cannot change back to current directory"));
 794    cwrelse(&cw);
 795
 796    setmsize(msgCount);
 797    if ((fm & FEDIT_NEWMAIL) && mb.mb_sorted && msgCount > omsgCount) {
 798       mb.mb_threaded = 0;
 799       c_sort((void*)-1);
 800    }
 801
 802    if (!(fm & FEDIT_NEWMAIL)) {
 803       pstate &= ~PS_SAW_COMMAND;
 804       pstate |= PS_SETFILE_OPENED;
 805    }
 806
 807    if ((options & OPT_EXISTONLY) && !(options & OPT_HEADERLIST)) {
 808       i = (msgCount == 0);
 809       goto jleave;
 810    }
 811
 812    if (!(fm & FEDIT_NEWMAIL) && (fm & FEDIT_SYSBOX) && msgCount == 0) {
 813       if (mb.mb_type == MB_MAILDIR /* XXX ?? */ && !ok_blook(emptystart))
 814          n_err(_("No mail at %s\n"), n_shexp_quote_cp(name, FAL0));
 815       i = 1;
 816       goto jleave;
 817    }
 818
 819    if ((fm & FEDIT_NEWMAIL) && msgCount > omsgCount)
 820       newmailinfo(omsgCount);
 821    i = 0;
 822 jleave:
 823    NYD_LEAVE;
 824    return i;
 825 }
 826
 827 FL bool_t
 828 maildir_quit(void)
 829 {
 830    sighandler_type saveint;
 831    struct cw cw;
 832    bool_t rv;
 833    NYD_ENTER;
 834
 835    rv = FAL0;
 836
 837    if (cwget(&cw) == STOP) {
 838       n_alert(_("Cannot open current directory"));
 839       goto jleave;
 840    }
 841
 842    saveint = safe_signal(SIGINT, SIG_IGN);
 843
 844    if (chdir(mailname) == -1) {
 845       n_err(_("Cannot change directory to %s\n"),
 846          n_shexp_quote_cp(mailname, FAL0));
 847       cwrelse(&cw);
 848       safe_signal(SIGINT, saveint);
 849       goto jleave;
 850    }
 851
 852    if (sigsetjmp(_maildir_jmp, 1) == 0) {
 853       if (saveint != SIG_IGN)
 854          safe_signal(SIGINT, &__maildircatch_hold);
 855       maildir_update();
 856    }
 857
 858    safe_signal(SIGINT, saveint);
 859
 860    if (cwret(&cw) == STOP)
 861       n_panic(_("Cannot change back to current directory"));
 862    cwrelse(&cw);
 863    rv = TRU1;
 864 jleave:
 865    NYD_LEAVE;
 866    return rv;
 867 }
 868
 869 FL enum okay
 870 maildir_append(char const *name, FILE *fp, long offset)
 871 {
 872    char *buf, *bp, *lp;
 873    size_t bufsize, buflen, cnt;
 874    off_t off1 = -1, offs;
 875    long size;
 876    int flag;
 877    enum {_NONE = 0, _INHEAD = 1<<0, _NLSEP = 1<<1} state;
 878    enum okay rv;
 879    NYD_ENTER;
 880
 881    if ((rv = mkmaildir(name)) != OKAY)
 882       goto jleave;
 883
 884    buf = smalloc(bufsize = LINESIZE); /* TODO line pool; signals */
 885    buflen = 0;
 886    cnt = fsize(fp);
 887    offs = offset /* BSD will move due to O_APPEND! ftell(fp) */;
 888    size = 0;
 889
 890    srelax_hold();
 891    for (flag = MNEW, state = _NLSEP;;) {
 892       bp = fgetline(&buf, &bufsize, &cnt, &buflen, fp, 1);
 893
 894       if (bp == NULL ||
 895             ((state & (_INHEAD | _NLSEP)) == _NLSEP &&
 896              is_head(buf, buflen, FAL0))) {
 897          if (off1 != (off_t)-1) {
 898             if ((rv = maildir_append1(name, fp, off1, size, flag)) == STOP)
 899                goto jfree;
 900             srelax();
 901             if (fseek(fp, offs + buflen, SEEK_SET) == -1) {
 902                rv = STOP;
 903                goto jfree;
 904             }
 905          }
 906          off1 = offs + buflen;
 907          size = 0;
 908          state = _INHEAD;
 909          flag = MNEW;
 910
 911          if (bp == NULL)
 912             break;
 913       } else
 914          size += buflen;
 915       offs += buflen;
 916
 917       state &= ~_NLSEP;
 918       if (buf[0] == '\n') {
 919          state &= ~_INHEAD;
 920          state |= _NLSEP;
 921       } else if (state & _INHEAD) {
 922          if (!ascncasecmp(buf, "status", 6)) {
 923             lp = buf + 6;
 924             while (whitechar(*lp))
 925                ++lp;
 926             if (*lp == ':')
 927                while (*++lp != '\0')
 928                   switch (*lp) {
 929                   case 'R':
 930                      flag |= MREAD;
 931                      break;
 932                   case 'O':
 933                      flag &= ~MNEW;
 934                      break;
 935                   }
 936          } else if (!ascncasecmp(buf, "x-status", 8)) {
 937             lp = buf + 8;
 938             while (whitechar(*lp))
 939                ++lp;
 940             if (*lp == ':') {
 941                while (*++lp != '\0')
 942                   switch (*lp) {
 943                   case 'F':
 944                      flag |= MFLAGGED;
 945                      break;
 946                   case 'A':
 947                      flag |= MANSWERED;
 948                      break;
 949                   case 'T':
 950                      flag |= MDRAFTED;
 951                      break;
 952                   }
 953             }
 954          }
 955       }
 956    }
 957    assert(rv == OKAY);
 958 jfree:
 959    srelax_rele();
 960    free(buf);
 961 jleave:
 962    NYD_LEAVE;
 963    return rv;
 964 }
 965
 966 FL enum okay
 967 maildir_remove(char const *name)
 968 {
 969    enum okay rv = STOP;
 970    NYD_ENTER;
 971
 972    if (subdir_remove(name, "tmp") == STOP ||
 973          subdir_remove(name, "new") == STOP ||
 974          subdir_remove(name, "cur") == STOP)
 975       goto jleave;
 976    if (rmdir(name) == -1) {
 977       n_perr(name, 0);
 978       goto jleave;
 979    }
 980    rv = OKAY;
 981 jleave:
 982    NYD_LEAVE;
 983    return rv;
 984 }
 985
 986 /* s-it-mode */