citadel/modules/imap/imap_tools.c

   1 /*
   2  * $Id$
   3  *
   4  * Utility functions for the IMAP module.
   5  *
   6  * Copyright (c) 2001-2009 by the citadel.org team and others, except for
   7  * most of the UTF7 and UTF8 handling code which was lifted from Evolution.
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 3 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <stdio.h>
  27 #include <ctype.h>
  28 #include <string.h>
  29 #include <libcitadel.h>
  30 #include "citadel.h"
  31 #include "sysdep_decls.h"
  32 #include "room_ops.h"
  33 #include "internet_addressing.h"
  34 #include "imap_tools.h"
  35 #include "ctdl_module.h"
  36
  37 #ifndef HAVE_SNPRINTF
  38 #include "snprintf.h"
  39 #endif
  40
  41 /* String handling helpers */
  42
  43 /* This code uses some pretty nasty string manipulation. To make everything
  44  * manageable, we use this semi-high-level string manipulation API. Strings are
  45  * always \0-terminated, despite the fact that we keep track of the size.
  46  */
  47 struct string {
  48         char* buffer;
  49         int maxsize;
  50         int size;
  51 };
  52
  53 static void string_init(struct string* s, char* buf, int bufsize)
  54 {
  55         s->buffer = buf;
  56         s->maxsize = bufsize-1;
  57         s->size = strlen(buf);
  58 }
  59
  60 static char* string_end(struct string* s)
  61 {
  62         return s->buffer + s->size;
  63 }
  64
  65 /* Append a UTF8 string of a particular length (in bytes). -1 to autocalculate. */
  66
  67 static void string_append_sn(struct string* s, char* p, int len)
  68 {
  69         if (len == -1)
  70                 len = strlen(p);
  71         if ((s->size+len) > s->maxsize)
  72                 len = s->maxsize - s->size;
  73         memcpy(s->buffer + s->size, p, len);
  74         s->size += len;
  75         s->buffer[s->size] = '\0';
  76 }
  77
  78 /* As above, always autocalculate. */
  79
  80 #define string_append_s(s, p) string_append_sn((s), (p), -1)
  81
  82 /* Appends a UTF8 character --- which may make the size change by more than 1!
  83  * If the string overflows, the last character may become invalid. */
  84
  85 static void string_append_c(struct string* s, int c)
  86 {
  87         char buf[5];
  88         int len = 0;
  89
  90         /* Don't do anything if there's no room. */
  91
  92         if (s->size == s->maxsize)
  93                 return;
  94
  95         if (c <= 0x7F)
  96         {
  97                 /* This is the most common case, so we optimise it. */
  98
  99                 s->buffer[s->size++] = c;
 100                 s->buffer[s->size] = 0;
 101                 return;
 102         }
 103         else if (c <= 0x7FF)
 104         {
 105                 buf[0] = 0xC0 | (c >> 6);
 106                 buf[1] = 0x80 | (c & 0x3F);
 107                 len = 2;
 108         }
 109         else if (c <= 0xFFFF)
 110         {
 111                 buf[0] = 0xE0 | (c >> 12);
 112                 buf[1] = 0x80 | ((c >> 6) & 0x3f);
 113                 buf[2] = 0x80 | (c & 0x3f);
 114                 len = 3;
 115         }
 116         else
 117         {
 118                 buf[0] = 0xf0 | c >> 18;
 119                 buf[1] = 0x80 | ((c >> 12) & 0x3f);
 120                 buf[2] = 0x80 | ((c >> 6) & 0x3f);
 121                 buf[3] = 0x80 | (c & 0x3f);
 122                 len = 4;
 123         }
 124
 125         string_append_sn(s, buf, len);
 126 }
 127
 128 /* Reads a UTF8 character from a char*, advancing the pointer. */
 129
 130 int utf8_getc(char** ptr)
 131 {
 132         unsigned char* p = (unsigned char*) *ptr;
 133         unsigned char c, r;
 134         int v, m;
 135
 136         for (;;)
 137         {
 138                 r = *p++;
 139         loop:
 140                 if (r < 0x80)
 141                 {
 142                         *ptr = (char*) p;
 143                         v = r;
 144                         break;
 145                 }
 146                 else if (r < 0xf8)
 147                 {
 148                         /* valid start char? (max 4 octets) */
 149                         v = r;
 150                         m = 0x7f80;     /* used to mask out the length bits */
 151                         do {
 152                                 c = *p++;
 153                                 if ((c & 0xc0) != 0x80)
 154                                 {
 155                                         r = c;
 156                                         goto loop;
 157                                 }
 158                                 v = (v<<6) | (c & 0x3f);
 159                                 r<<=1;
 160                                 m<<=5;
 161                         } while (r & 0x40);
 162
 163                         *ptr = (char*)p;
 164
 165                         v &= ~m;
 166                         break;
 167                 }
 168         }
 169
 170         return v;
 171 }
 172
 173 /* IMAP name safety */
 174
 175 /* IMAP has certain special requirements in its character set, which means we
 176  * have to do a fair bit of work to convert Citadel's UTF8 strings to IMAP
 177  * strings. The next two routines (and their data tables) do that.
 178  */
 179
 180 static char *utf7_alphabet =
 181         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
 182
 183 static unsigned char utf7_rank[256] = {
 184         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 185         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 186         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x3E,0x3F,0xFF,0xFF,0xFF,
 187         0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 188         0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,
 189         0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF,
 190         0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,
 191         0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,0x31,0x32,0x33,0xFF,0xFF,0xFF,0xFF,0xFF,
 192         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 193         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 194         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 195         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 196         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 197         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 198         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 199         0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 200 };
 201
 202 /* Base64 helpers. */
 203
 204 static void utf7_closeb64(struct string* out, int v, int i)
 205 {
 206         int x;
 207
 208         if (i > 0)
 209         {
 210                 x = (v << (6-i)) & 0x3F;
 211                 string_append_c(out, utf7_alphabet[x]);
 212         }
 213         string_append_c(out, '-');
 214 }
 215
 216 /* Convert from a Citadel name to an IMAP-safe name. Returns the end
 217  * of the destination.
 218  */
 219 static char* toimap(char* destp, char* destend, char* src)
 220 {
 221         struct string dest;
 222         int state = 0;
 223         int v = 0;
 224         int i = 0;
 225
 226         *destp = 0;
 227         string_init(&dest, destp, destend-destp);
 228         /* CtdlLogPrintf(CTDL_DEBUG, "toimap %s\r\n", src); */
 229
 230         for (;;)
 231         {
 232                 int c = utf8_getc(&src);
 233                 if (c == '\0')
 234                         break;
 235
 236                 if (c >= 0x20 && c <= 0x7e)
 237                 {
 238                         if (state == 1)
 239                         {
 240                                 utf7_closeb64(&dest, v, i);
 241                                 state = 0;
 242                                 i = 0;
 243                         }
 244
 245                         switch (c)
 246                         {
 247                                 case '&':
 248                                         string_append_sn(&dest, "&-", 2);
 249                                         break;
 250
 251                                 case '/':
 252                                         /* Citadel extension: / becomes |, because /
 253                                          * isn't valid as part of an IMAP name. */
 254
 255                                         c = '|';
 256                                         goto defaultcase;
 257
 258                                 case '\\':
 259                                         /* Citadel extension: backslashes mark folder
 260                                          * seperators in the IMAP subfolder emulation
 261                                          * hack. We turn them into / characters,
 262                                          * *except* if it's the last character in the
 263                                          * string. */
 264
 265                                         if (*src != '\0')
 266                                                 c = '/';
 267                                         /* fall through */
 268
 269                                 default:
 270                                 defaultcase:
 271                                         string_append_c(&dest, c);
 272                         }
 273                 }
 274                 else
 275                 {
 276                         if (state == 0)
 277                         {
 278                                 string_append_c(&dest, '&');
 279                                 state = 1;
 280                         }
 281                         v = (v << 16) | c;
 282                         i += 16;
 283                         while (i >= 6)
 284                         {
 285                                 int x = (v >> (i-6)) & 0x3f;
 286                                 string_append_c(&dest, utf7_alphabet[x]);
 287                                 i -= 6;
 288                         }
 289                 }
 290         }
 291
 292         if (state == 1)
 293                 utf7_closeb64(&dest, v, i);
 294         /* CtdlLogPrintf(CTDL_DEBUG, "    -> %s\r\n", destp); */
 295         return string_end(&dest);
 296 }
 297
 298 /* Convert from an IMAP-safe name back into a Citadel name. Returns the end of the destination. */
 299
 300 static int cfrommap(int c);
 301 static char* fromimap(char* destp, char* destend, char* src)
 302 {
 303         struct string dest;
 304         unsigned char *p = (unsigned char*) src;
 305         int v = 0;
 306         int i = 0;
 307         int state = 0;
 308         int c;
 309
 310         *destp = 0;
 311         string_init(&dest, destp, destend-destp);
 312         /* CtdlLogPrintf(CTDL_DEBUG, "fromimap %s\r\n", src); */
 313
 314         do {
 315                 c = *p++;
 316                 switch (state)
 317                 {
 318                         case 0:
 319                                 /* US-ASCII characters. */
 320
 321                                 if (c == '&')
 322                                         state = 1;
 323                                 else
 324                                         string_append_c(&dest, cfrommap(c));
 325                                 break;
 326
 327                         case 1:
 328                                 if (c == '-')
 329                                 {
 330                                         string_append_c(&dest, '&');
 331                                         state = 0;
 332                                 }
 333                                 else if (utf7_rank[c] != 0xff)
 334                                 {
 335                                         v = utf7_rank[c];
 336                                         i = 6;
 337                                         state = 2;
 338                                 }
 339                                 else
 340                                 {
 341                                         /* invalid char */
 342                                         string_append_sn(&dest, "&-", 2);
 343                                         state = 0;
 344                                 }
 345                                 break;
 346
 347                         case 2:
 348                                 if (c == '-')
 349                                         state = 0;
 350                                 else if (utf7_rank[c] != 0xFF)
 351                                 {
 352                                         v = (v<<6) | utf7_rank[c];
 353                                         i += 6;
 354                                         if (i >= 16)
 355                                         {
 356                                                 int x = (v >> (i-16)) & 0xFFFF;
 357                                                 string_append_c(&dest, cfrommap(x));
 358                                                 i -= 16;
 359                                         }
 360                                 }
 361                                 else
 362                                 {
 363                                         string_append_c(&dest, cfrommap(c));
 364                                         state = 0;
 365                                 }
 366                                 break;
 367                         }
 368         } while (c != '\0');
 369
 370         /* CtdlLogPrintf(CTDL_DEBUG, "      -> %s\r\n", destp); */
 371         return string_end(&dest);
 372 }
 373
 374 /* Undoes the special character conversion. */
 375
 376 static int cfrommap(int c)
 377 {
 378         switch (c)
 379         {
 380                 case '|':       return '/';
 381                 case '/':       return '\\';
 382         }
 383         return c;
 384 }
 385
 386 /* Output a string to the IMAP client, either as a literal or quoted.
 387  * (We do a literal if it has any double-quotes or backslashes.) */
 388
 389 void imap_strout(char *buf)
 390 {
 391         int i;
 392         int is_literal = 0;
 393         long len;
 394
 395         if (buf == NULL) {      /* yeah, we handle this */
 396                 cprintf("NIL");
 397                 return;
 398         }
 399
 400         len = strlen(buf);
 401         for (i = 0; i < len; ++i) {
 402                 if ((buf[i] == '\"') || (buf[i] == '\\'))
 403                         is_literal = 1;
 404         }
 405
 406         if (is_literal) {
 407                 cprintf("{%ld}\r\n%s", len, buf);
 408         } else {
 409                 cprintf("\"%s\"", buf);
 410         }
 411 }
 412
 413 /* Break a command down into tokens, unquoting any escaped characters. */
 414
 415 int imap_parameterize(char** args, char* in)
 416 {
 417         char* out = in;
 418         int num = 0;
 419
 420         for (;;)
 421         {
 422                 /* Skip whitespace. */
 423
 424                 while (isspace(*in))
 425                         in++;
 426                 if (*in == 0)
 427                         break;
 428
 429                 /* Found the start of a token. */
 430
 431                 args[num++] = out;
 432
 433                 /* Read in the token. */
 434
 435                 for (;;)
 436                 {
 437                         int c = *in++;
 438                         if (isspace(c))
 439                                 break;
 440
 441                         if (c == '\"')
 442                         {
 443                                 /* Found a quoted section. */
 444
 445                                 for (;;)
 446                                 {
 447                                         c = *in++;
 448                                         if (c == '\"')
 449                                                 break;
 450                                         else if (c == '\\')
 451                                                 c = *in++;
 452
 453                                         *out++ = c;
 454                                         if (c == 0)
 455                                                 return num;
 456                                 }
 457                         }
 458                         else if (c == '\\')
 459                         {
 460                                 c = *in++;
 461                                 *out++ = c;
 462                         }
 463                         else
 464                                 *out++ = c;
 465
 466                         if (c == 0)
 467                                 return num;
 468                 }
 469                 *out++ = '\0';
 470         }
 471
 472         return num;
 473 }
 474
 475 /* Convert a struct ctdlroom to an IMAP-compatible mailbox name. */
 476
 477 void imap_mailboxname(char *buf, int bufsize, struct ctdlroom *qrbuf)
 478 {
 479         char* bufend = buf+bufsize;
 480         struct floor *fl;
 481         char* p = buf;
 482
 483         /* For mailboxes, just do it straight.
 484          * Do the Cyrus-compatible thing: all private folders are
 485          * subfolders of INBOX. */
 486
 487         if (qrbuf->QRflags & QR_MAILBOX)
 488         {
 489                 if (strcasecmp(qrbuf->QRname+11, MAILROOM) == 0)
 490                         p = toimap(p, bufend, "INBOX");
 491                 else
 492                 {
 493                         p = toimap(p, bufend, "INBOX");
 494                         if (p < bufend)
 495                                 *p++ = '/';
 496                         p = toimap(p, bufend, qrbuf->QRname+11);
 497                 }
 498         }
 499         else
 500         {
 501                 /* Otherwise, prefix the floor name as a "public folders" moniker. */
 502
 503                 fl = cgetfloor(qrbuf->QRfloor);
 504                 p = toimap(p, bufend, fl->f_name);
 505                 if (p < bufend)
 506                         *p++ = '/';
 507                 p = toimap(p, bufend, qrbuf->QRname);
 508         }
 509 }
 510
 511 /*
 512  * Convert an inputted folder name to our best guess as to what an equivalent
 513  * room name should be.
 514  *
 515  * If an error occurs, it returns -1.  Otherwise...
 516  *
 517  * The lower eight bits of the return value are the floor number on which the
 518  * room most likely resides.   The upper eight bits may contain flags,
 519  * including IR_MAILBOX if we're dealing with a personal room.
 520  *
 521  */
 522
 523 int imap_roomname(char *rbuf, int bufsize, char *foldername)
 524 {
 525         int levels;
 526         char floorname[256];
 527         char roomname[ROOMNAMELEN];
 528         int i;
 529         struct floor *fl;
 530         int ret = (-1);
 531
 532         if (foldername == NULL)
 533                 return(-1);
 534
 535         /* Unmunge the entire string into the output buffer. */
 536
 537         fromimap(rbuf, rbuf+bufsize, foldername);
 538
 539         /* Is this an IMAP inbox? */
 540
 541         if (strncasecmp(rbuf, "INBOX", 5) == 0)
 542         {
 543                 if (rbuf[5] == 0)
 544                 {
 545                         /* It's the system inbox. */
 546
 547                         safestrncpy(rbuf, MAILROOM, bufsize);
 548                         ret = (0 | IR_MAILBOX);
 549                         goto exit;
 550                 }
 551                 else if (rbuf[5] == FDELIM)
 552                 {
 553                         /* It's another personal mail folder. */
 554
 555                         safestrncpy(rbuf, rbuf+6, bufsize);
 556                         ret = (0 | IR_MAILBOX);
 557                         goto exit;
 558                 }
 559
 560                 /* If we get here, the folder just happens to start with INBOX
 561                  * --- fall through. */
 562         }
 563
 564         /* Is this a multi-level room name? */
 565
 566         levels = num_tokens(rbuf, FDELIM);
 567         if (levels > 1)
 568         {
 569                 /* Extract the main room name. */
 570
 571                 extract_token(floorname, rbuf, 0, FDELIM, sizeof floorname);
 572                 strcpy(roomname, &rbuf[strlen(floorname)+1]);
 573
 574                 /* Try and find it on any floor. */
 575
 576                 for (i = 0; i < MAXFLOORS; ++i)
 577                 {
 578                         fl = cgetfloor(i);
 579                         if (fl->f_flags & F_INUSE)
 580                         {
 581                                 if (strcasecmp(floorname, fl->f_name) == 0)
 582                                 {
 583                                         /* Got it! */
 584
 585                                         safestrncpy(rbuf, roomname, bufsize);
 586                                         ret = i;
 587                                         goto exit;
 588                                 }
 589                         }
 590                 }
 591         }
 592
 593         /* Meh. It's either not a multi-level room name, or else we
 594          * couldn't find it.
 595          */
 596         ret = (0 | IR_MAILBOX);
 597
 598 exit:
 599         CtdlLogPrintf(CTDL_DEBUG, "(That translates to \"%s\")\n", rbuf);
 600         return(ret);
 601 }
 602
 603 /*
 604  * Output a struct internet_address_list in the form an IMAP client wants
 605  */
 606 void imap_ial_out(struct internet_address_list *ialist)
 607 {
 608         struct internet_address_list *iptr;
 609
 610         if (ialist == NULL) {
 611                 cprintf("NIL");
 612                 return;
 613         }
 614         cprintf("(");
 615
 616         for (iptr = ialist; iptr != NULL; iptr = iptr->next) {
 617                 cprintf("(");
 618                 imap_strout(iptr->ial_name);
 619                 cprintf(" NIL ");
 620                 imap_strout(iptr->ial_user);
 621                 cprintf(" ");
 622                 imap_strout(iptr->ial_node);
 623                 cprintf(")");
 624         }
 625
 626         cprintf(")");
 627 }
 628
 629
 630
 631 /*
 632  * Determine whether the supplied string is a valid message set.
 633  * If the string contains only numbers, colons, commas, and asterisks,
 634  * return 1 for a valid message set.  If any other character is found,
 635  * return 0.
 636  */
 637 int imap_is_message_set(char *buf)
 638 {
 639         int i;
 640
 641         if (buf == NULL)
 642                 return (0);     /* stupidity checks */
 643         if (IsEmptyStr(buf))
 644                 return (0);
 645
 646         if (!strcasecmp(buf, "ALL"))
 647                 return (1);     /* macro?  why?  */
 648
 649         for (i = 0; buf[i]; ++i) {      /* now start the scan */
 650                 if (
 651                            (!isdigit(buf[i]))
 652                            && (buf[i] != ':')
 653                            && (buf[i] != ',')
 654                            && (buf[i] != '*')
 655                     )
 656                         return (0);
 657         }
 658
 659         return (1);             /* looks like we're good */
 660 }
 661
 662
 663 /*
 664  * imap_match.c, based on wildmat.c from INN
 665  * hacked for Citadel/IMAP by Daniel Malament
 666  */
 667
 668 /* note: not all return statements use these; don't change them */
 669 #define WILDMAT_TRUE    1
 670 #define WILDMAT_FALSE   0
 671 #define WILDMAT_ABORT   -1
 672 #define WILDMAT_DELIM   '/'
 673
 674 /*
 675  * Match text and p, return TRUE, FALSE, or ABORT.
 676  */
 677 static int do_imap_match(const char *supplied_text, const char *supplied_p)
 678 {
 679         int matched, i;
 680         char lcase_text[SIZ], lcase_p[SIZ];
 681         char *text = lcase_text;
 682         char *p = lcase_p;
 683
 684         /* Copy both strings and lowercase them, in order to
 685          * make this entire operation case-insensitive.
 686          */
 687         for (i=0; i<=strlen(supplied_text); ++i)
 688                 lcase_text[i] = tolower(supplied_text[i]);
 689         for (i=0; i<=strlen(supplied_p); ++i)
 690                 p[i] = tolower(supplied_p[i]);
 691
 692         /* Start matching */
 693         for (; *p; text++, p++) {
 694                 if ((*text == '\0') && (*p != '*') && (*p != '%')) {
 695                         return WILDMAT_ABORT;
 696                 }
 697                 switch (*p) {
 698                 default:
 699                         if (*text != *p) {
 700                                 return WILDMAT_FALSE;
 701                         }
 702                         continue;
 703                 case '*':
 704 star:
 705                         while (++p, ((*p == '*') || (*p == '%'))) {
 706                                 /* Consecutive stars or %'s act
 707                                  * just like one star.
 708                                  */
 709                                 continue;
 710                         }
 711                         if (*p == '\0') {
 712                                 /* Trailing star matches everything. */
 713                                 return WILDMAT_TRUE;
 714                         }
 715                         while (*text) {
 716                                 if ((matched = do_imap_match(text++, p))
 717                                    != WILDMAT_FALSE) {
 718                                         return matched;
 719                                 }
 720                         }
 721                         return WILDMAT_ABORT;
 722                 case '%':
 723                         while (++p, ((*p == '*') || (*p == '%'))) {
 724                                 /* Consecutive %'s act just like one, but even
 725                                  * a single star makes the sequence act like
 726                                  * one star, instead.
 727                                  */
 728                                 if (*p == '*') {
 729                                         goto star;
 730                                 }
 731                                 continue;
 732                         }
 733                         if (*p == '\0') {
 734                                 /*
 735                                  * Trailing % matches everything
 736                                  * without a delimiter.
 737                                  */
 738                                 while (*text) {
 739                                         if (*text == WILDMAT_DELIM) {
 740                                                 return WILDMAT_FALSE;
 741                                         }
 742                                         text++;
 743                                 }
 744                                 return WILDMAT_TRUE;
 745                         }
 746                         while (*text && (*(text - 1) != WILDMAT_DELIM)) {
 747                                 if ((matched = do_imap_match(text++, p))
 748                                    != WILDMAT_FALSE) {
 749                                         return matched;
 750                                 }
 751                         }
 752                         return WILDMAT_ABORT;
 753                 }
 754         }
 755
 756         return (*text == '\0');
 757 }
 758
 759
 760
 761 /*
 762  * Support function for mailbox pattern name matching in LIST and LSUB
 763  * Returns nonzero if the supplied mailbox name matches the supplied pattern.
 764  */
 765 int imap_mailbox_matches_pattern(char *pattern, char *mailboxname)
 766 {
 767         /* handle just-star case quickly */
 768         if ((pattern[0] == '*') && (pattern[1] == '\0')) {
 769                 return WILDMAT_TRUE;
 770         }
 771         return (do_imap_match(mailboxname, pattern) == WILDMAT_TRUE);
 772 }
 773
 774
 775
 776 /*
 777  * Compare an IMAP date string (date only, no time) to the date found in
 778  * a Unix timestamp.
 779  */
 780 int imap_datecmp(char *datestr, time_t msgtime) {
 781         char daystr[256];
 782         char monthstr[256];
 783         char yearstr[256];
 784         int i;
 785         int day, month, year;
 786         int msgday, msgmonth, msgyear;
 787         struct tm msgtm;
 788
 789         char *imap_datecmp_ascmonths[12] = {
 790                 "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
 791         };
 792
 793         if (datestr == NULL) return(0);
 794
 795         /* Expecting a date in the form dd-Mmm-yyyy */
 796         extract_token(daystr, datestr, 0, '-', sizeof daystr);
 797         extract_token(monthstr, datestr, 1, '-', sizeof monthstr);
 798         extract_token(yearstr, datestr, 2, '-', sizeof yearstr);
 799
 800         day = atoi(daystr);
 801         year = atoi(yearstr);
 802         month = 0;
 803         for (i=0; i<12; ++i) {
 804                 if (!strcasecmp(monthstr, imap_datecmp_ascmonths[i])) {
 805                         month = i;
 806                 }
 807         }
 808
 809         /* Extract day/month/year from message timestamp */
 810         localtime_r(&msgtime, &msgtm);
 811         msgday = msgtm.tm_mday;
 812         msgmonth = msgtm.tm_mon;
 813         msgyear = msgtm.tm_year + 1900;
 814
 815         /* Now start comparing */
 816
 817         if (year < msgyear) return(+1);
 818         if (year > msgyear) return(-1);
 819
 820         if (month < msgmonth) return(+1);
 821         if (month > msgmonth) return(-1);
 822
 823         if (day < msgday) return(+1);
 824         if (day > msgday) return(-1);
 825
 826         return(0);
 827 }
 828