citadel/modules/imap/imap_tools.c

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