lib/util/util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2001-2002
   6    Copyright (C) Simo Sorce 2001
   7    Copyright (C) Jim McDonough (jmcd@us.ibm.com)  2003.
   8    Copyright (C) James J Myers 2003
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/network.h"
  26 #include "system/filesys.h"
  27 #include "system/locale.h"
  28 #undef malloc
  29 #undef strcasecmp
  30 #undef strncasecmp
  31 #undef strdup
  32 #undef realloc
  33
  34 /**
  35  * @file
  36  * @brief Misc utility functions
  37  */
  38
  39 /**
  40  Find a suitable temporary directory. The result should be copied immediately
  41  as it may be overwritten by a subsequent call.
  42 **/
  43 _PUBLIC_ const char *tmpdir(void)
  44 {
  45         char *p;
  46         if ((p = getenv("TMPDIR")))
  47                 return p;
  48         return "/tmp";
  49 }
  50
  51
  52 /**
  53  Check if a file exists - call vfs_file_exist for samba files.
  54 **/
  55 _PUBLIC_ bool file_exist(const char *fname)
  56 {
  57         struct stat st;
  58
  59         if (stat(fname, &st) != 0) {
  60                 return false;
  61         }
  62
  63         return ((S_ISREG(st.st_mode)) || (S_ISFIFO(st.st_mode)));
  64 }
  65
  66 /**
  67  Check a files mod time.
  68 **/
  69
  70 _PUBLIC_ time_t file_modtime(const char *fname)
  71 {
  72         struct stat st;
  73
  74         if (stat(fname,&st) != 0)
  75                 return(0);
  76
  77         return(st.st_mtime);
  78 }
  79
  80 /**
  81  Check if a directory exists.
  82 **/
  83
  84 _PUBLIC_ bool directory_exist(const char *dname)
  85 {
  86         struct stat st;
  87         bool ret;
  88
  89         if (stat(dname,&st) != 0) {
  90                 return false;
  91         }
  92
  93         ret = S_ISDIR(st.st_mode);
  94         if(!ret)
  95                 errno = ENOTDIR;
  96         return ret;
  97 }
  98
  99 /**
 100  * Try to create the specified directory if it didn't exist.
 101  *
 102  * @retval true if the directory already existed and has the right permissions
 103  * or was successfully created.
 104  */
 105 _PUBLIC_ bool directory_create_or_exist(const char *dname, uid_t uid,
 106                                mode_t dir_perms)
 107 {
 108         mode_t old_umask;
 109         struct stat st;
 110
 111         old_umask = umask(0);
 112         if (lstat(dname, &st) == -1) {
 113                 if (errno == ENOENT) {
 114                         /* Create directory */
 115                         if (mkdir(dname, dir_perms) == -1) {
 116                                 DEBUG(0, ("error creating directory "
 117                                           "%s: %s\n", dname,
 118                                           strerror(errno)));
 119                                 umask(old_umask);
 120                                 return false;
 121                         }
 122                 } else {
 123                         DEBUG(0, ("lstat failed on directory %s: %s\n",
 124                                   dname, strerror(errno)));
 125                         umask(old_umask);
 126                         return false;
 127                 }
 128         } else {
 129                 /* Check ownership and permission on existing directory */
 130                 if (!S_ISDIR(st.st_mode)) {
 131                         DEBUG(0, ("directory %s isn't a directory\n",
 132                                 dname));
 133                         umask(old_umask);
 134                         return false;
 135                 }
 136                 if ((st.st_uid != uid) ||
 137                     ((st.st_mode & 0777) != dir_perms)) {
 138 #ifndef UID_WRAPPER_REPLACE
 139                         DEBUG(0, ("invalid permissions on directory "
 140                                   "%s\n", dname));
 141                         umask(old_umask);
 142                         return false;
 143 #endif
 144                 }
 145         }
 146         return true;
 147 }
 148
 149
 150 /**
 151  Sleep for a specified number of milliseconds.
 152 **/
 153
 154 _PUBLIC_ void msleep(unsigned int t)
 155 {
 156         struct timeval tval;
 157
 158         tval.tv_sec = t/1000;
 159         tval.tv_usec = 1000*(t%1000);
 160         /* this should be the real select - do NOT replace
 161            with sys_select() */
 162         select(0,NULL,NULL,NULL,&tval);
 163 }
 164
 165 /**
 166  Get my own name, return in talloc'ed storage.
 167 **/
 168
 169 _PUBLIC_ char *get_myname(TALLOC_CTX *ctx)
 170 {
 171         char *p;
 172         char hostname[HOST_NAME_MAX];
 173
 174         /* get my host name */
 175         if (gethostname(hostname, sizeof(hostname)) == -1) {
 176                 DEBUG(0,("gethostname failed\n"));
 177                 return NULL;
 178         }
 179
 180         /* Ensure null termination. */
 181         hostname[sizeof(hostname)-1] = '\0';
 182
 183         /* split off any parts after an initial . */
 184         p = strchr_m(hostname, '.');
 185         if (p) {
 186                 *p = 0;
 187         }
 188
 189         return talloc_strdup(ctx, hostname);
 190 }
 191
 192 /**
 193  Check if a process exists. Does this work on all unixes?
 194 **/
 195
 196 _PUBLIC_ bool process_exists_by_pid(pid_t pid)
 197 {
 198         /* Doing kill with a non-positive pid causes messages to be
 199          * sent to places we don't want. */
 200         SMB_ASSERT(pid > 0);
 201         return(kill(pid,0) == 0 || errno != ESRCH);
 202 }
 203
 204 /**
 205  Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
 206  is dealt with in posix.c
 207 **/
 208
 209 _PUBLIC_ bool fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
 210 {
 211         struct flock lock;
 212         int ret;
 213
 214         DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
 215
 216         lock.l_type = type;
 217         lock.l_whence = SEEK_SET;
 218         lock.l_start = offset;
 219         lock.l_len = count;
 220         lock.l_pid = 0;
 221
 222         ret = fcntl(fd,op,&lock);
 223
 224         if (ret == -1 && errno != 0)
 225                 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
 226
 227         /* a lock query */
 228         if (op == F_GETLK) {
 229                 if ((ret != -1) &&
 230                                 (lock.l_type != F_UNLCK) &&
 231                                 (lock.l_pid != 0) &&
 232                                 (lock.l_pid != getpid())) {
 233                         DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
 234                         return true;
 235                 }
 236
 237                 /* it must be not locked or locked by me */
 238                 return false;
 239         }
 240
 241         /* a lock set or unset */
 242         if (ret == -1) {
 243                 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
 244                         (double)offset,(double)count,op,type,strerror(errno)));
 245                 return false;
 246         }
 247
 248         /* everything went OK */
 249         DEBUG(8,("fcntl_lock: Lock call successful\n"));
 250
 251         return true;
 252 }
 253
 254 void print_asc(int level, const uint8_t *buf,int len)
 255 {
 256         int i;
 257         for (i=0;i<len;i++)
 258                 DEBUGADD(level,("%c", isprint(buf[i])?buf[i]:'.'));
 259 }
 260
 261 /**
 262  * Write dump of binary data to the log file.
 263  *
 264  * The data is only written if the log level is at least level.
 265  */
 266 static void _dump_data(int level, const uint8_t *buf, int len,
 267                        bool omit_zero_bytes)
 268 {
 269         int i=0;
 270         static const uint8_t empty[16] = { 0, };
 271         bool skipped = false;
 272
 273         if (len<=0) return;
 274
 275         if (!DEBUGLVL(level)) return;
 276
 277         for (i=0;i<len;) {
 278
 279                 if (i%16 == 0) {
 280                         if ((omit_zero_bytes == true) &&
 281                             (i > 0) &&
 282                             (len > i+16) &&
 283                             (memcmp(&buf[i], &empty, 16) == 0))
 284                         {
 285                                 i +=16;
 286                                 continue;
 287                         }
 288
 289                         if (i<len)  {
 290                                 DEBUGADD(level,("[%04X] ",i));
 291                         }
 292                 }
 293
 294                 DEBUGADD(level,("%02X ",(int)buf[i]));
 295                 i++;
 296                 if (i%8 == 0) DEBUGADD(level,("  "));
 297                 if (i%16 == 0) {
 298
 299                         print_asc(level,&buf[i-16],8); DEBUGADD(level,(" "));
 300                         print_asc(level,&buf[i-8],8); DEBUGADD(level,("\n"));
 301
 302                         if ((omit_zero_bytes == true) &&
 303                             (len > i+16) &&
 304                             (memcmp(&buf[i], &empty, 16) == 0)) {
 305                                 if (!skipped) {
 306                                         DEBUGADD(level,("skipping zero buffer bytes\n"));
 307                                         skipped = true;
 308                                 }
 309                         }
 310                 }
 311         }
 312
 313         if (i%16) {
 314                 int n;
 315                 n = 16 - (i%16);
 316                 DEBUGADD(level,(" "));
 317                 if (n>8) DEBUGADD(level,(" "));
 318                 while (n--) DEBUGADD(level,("   "));
 319                 n = MIN(8,i%16);
 320                 print_asc(level,&buf[i-(i%16)],n); DEBUGADD(level,( " " ));
 321                 n = (i%16) - n;
 322                 if (n>0) print_asc(level,&buf[i-n],n);
 323                 DEBUGADD(level,("\n"));
 324         }
 325
 326 }
 327
 328 /**
 329  * Write dump of binary data to the log file.
 330  *
 331  * The data is only written if the log level is at least level.
 332  */
 333 _PUBLIC_ void dump_data(int level, const uint8_t *buf, int len)
 334 {
 335         _dump_data(level, buf, len, false);
 336 }
 337
 338 /**
 339  * Write dump of binary data to the log file.
 340  *
 341  * The data is only written if the log level is at least level.
 342  * 16 zero bytes in a row are ommited
 343  */
 344 _PUBLIC_ void dump_data_skip_zeros(int level, const uint8_t *buf, int len)
 345 {
 346         _dump_data(level, buf, len, true);
 347 }
 348
 349
 350 /**
 351  malloc that aborts with smb_panic on fail or zero size.
 352 **/
 353
 354 _PUBLIC_ void *smb_xmalloc(size_t size)
 355 {
 356         void *p;
 357         if (size == 0)
 358                 smb_panic("smb_xmalloc: called with zero size.\n");
 359         if ((p = malloc(size)) == NULL)
 360                 smb_panic("smb_xmalloc: malloc fail.\n");
 361         return p;
 362 }
 363
 364 /**
 365  Memdup with smb_panic on fail.
 366 **/
 367
 368 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
 369 {
 370         void *p2;
 371         p2 = smb_xmalloc(size);
 372         memcpy(p2, p, size);
 373         return p2;
 374 }
 375
 376 /**
 377  strdup that aborts on malloc fail.
 378 **/
 379
 380 char *smb_xstrdup(const char *s)
 381 {
 382 #if defined(PARANOID_MALLOC_CHECKER)
 383 #ifdef strdup
 384 #undef strdup
 385 #endif
 386 #endif
 387
 388 #ifndef HAVE_STRDUP
 389 #define strdup rep_strdup
 390 #endif
 391
 392         char *s1 = strdup(s);
 393 #if defined(PARANOID_MALLOC_CHECKER)
 394 #ifdef strdup
 395 #undef strdup
 396 #endif
 397 #define strdup(s) __ERROR_DONT_USE_STRDUP_DIRECTLY
 398 #endif
 399         if (!s1) {
 400                 smb_panic("smb_xstrdup: malloc failed");
 401         }
 402         return s1;
 403
 404 }
 405
 406 /**
 407  strndup that aborts on malloc fail.
 408 **/
 409
 410 char *smb_xstrndup(const char *s, size_t n)
 411 {
 412 #if defined(PARANOID_MALLOC_CHECKER)
 413 #ifdef strndup
 414 #undef strndup
 415 #endif
 416 #endif
 417
 418 #if (defined(BROKEN_STRNDUP) || !defined(HAVE_STRNDUP))
 419 #undef HAVE_STRNDUP
 420 #define strndup rep_strndup
 421 #endif
 422
 423         char *s1 = strndup(s, n);
 424 #if defined(PARANOID_MALLOC_CHECKER)
 425 #ifdef strndup
 426 #undef strndup
 427 #endif
 428 #define strndup(s,n) __ERROR_DONT_USE_STRNDUP_DIRECTLY
 429 #endif
 430         if (!s1) {
 431                 smb_panic("smb_xstrndup: malloc failed");
 432         }
 433         return s1;
 434 }
 435
 436
 437
 438 /**
 439  Like strdup but for memory.
 440 **/
 441
 442 _PUBLIC_ void *memdup(const void *p, size_t size)
 443 {
 444         void *p2;
 445         if (size == 0)
 446                 return NULL;
 447         p2 = malloc(size);
 448         if (!p2)
 449                 return NULL;
 450         memcpy(p2, p, size);
 451         return p2;
 452 }
 453
 454 /**
 455  * Write a password to the log file.
 456  *
 457  * @note Only actually does something if DEBUG_PASSWORD was defined during
 458  * compile-time.
 459  */
 460 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
 461 {
 462 #ifdef DEBUG_PASSWORD
 463         DEBUG(11, ("%s", msg));
 464         if (data != NULL && len > 0)
 465         {
 466                 dump_data(11, data, len);
 467         }
 468 #endif
 469 }
 470
 471
 472 /**
 473  * see if a range of memory is all zero. A NULL pointer is considered
 474  * to be all zero
 475  */
 476 _PUBLIC_ bool all_zero(const uint8_t *ptr, size_t size)
 477 {
 478         int i;
 479         if (!ptr) return true;
 480         for (i=0;i<size;i++) {
 481                 if (ptr[i]) return false;
 482         }
 483         return true;
 484 }
 485
 486 /**
 487   realloc an array, checking for integer overflow in the array size
 488 */
 489 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count, bool free_on_fail)
 490 {
 491 #define MAX_MALLOC_SIZE 0x7fffffff
 492         if (count == 0 ||
 493             count >= MAX_MALLOC_SIZE/el_size) {
 494                 if (free_on_fail)
 495                         SAFE_FREE(ptr);
 496                 return NULL;
 497         }
 498         if (!ptr) {
 499                 return malloc(el_size * count);
 500         }
 501         return realloc(ptr, el_size * count);
 502 }
 503
 504 /****************************************************************************
 505  Type-safe malloc.
 506 ****************************************************************************/
 507
 508 void *malloc_array(size_t el_size, unsigned int count)
 509 {
 510         return realloc_array(NULL, el_size, count, false);
 511 }
 512
 513 /**
 514  Trim the specified elements off the front and back of a string.
 515 **/
 516 _PUBLIC_ bool trim_string(char *s, const char *front, const char *back)
 517 {
 518         bool ret = false;
 519         size_t front_len;
 520         size_t back_len;
 521         size_t len;
 522
 523         /* Ignore null or empty strings. */
 524         if (!s || (s[0] == '\0'))
 525                 return false;
 526
 527         front_len       = front? strlen(front) : 0;
 528         back_len        = back? strlen(back) : 0;
 529
 530         len = strlen(s);
 531
 532         if (front_len) {
 533                 while (len && strncmp(s, front, front_len)==0) {
 534                         /* Must use memmove here as src & dest can
 535                          * easily overlap. Found by valgrind. JRA. */
 536                         memmove(s, s+front_len, (len-front_len)+1);
 537                         len -= front_len;
 538                         ret=true;
 539                 }
 540         }
 541
 542         if (back_len) {
 543                 while ((len >= back_len) && strncmp(s+len-back_len,back,back_len)==0) {
 544                         s[len-back_len]='\0';
 545                         len -= back_len;
 546                         ret=true;
 547                 }
 548         }
 549         return ret;
 550 }
 551
 552 /**
 553  Find the number of 'c' chars in a string
 554 **/
 555 _PUBLIC_ _PURE_ size_t count_chars(const char *s, char c)
 556 {
 557         size_t count = 0;
 558
 559         while (*s) {
 560                 if (*s == c) count++;
 561                 s ++;
 562         }
 563
 564         return count;
 565 }
 566
 567 /**
 568  Routine to get hex characters and turn them into a 16 byte array.
 569  the array can be variable length, and any non-hex-numeric
 570  characters are skipped.  "0xnn" or "0Xnn" is specially catered
 571  for.
 572
 573  valid examples: "0A5D15"; "0x15, 0x49, 0xa2"; "59\ta9\te3\n"
 574
 575
 576 **/
 577 _PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len)
 578 {
 579         size_t i;
 580         size_t num_chars = 0;
 581         uint8_t   lonybble, hinybble;
 582         const char     *hexchars = "0123456789ABCDEF";
 583         char           *p1 = NULL, *p2 = NULL;
 584
 585         for (i = 0; i < strhex_len && strhex[i] != 0; i++) {
 586                 if (strncasecmp(hexchars, "0x", 2) == 0) {
 587                         i++; /* skip two chars */
 588                         continue;
 589                 }
 590
 591                 if (!(p1 = strchr(hexchars, toupper((unsigned char)strhex[i]))))
 592                         break;
 593
 594                 i++; /* next hex digit */
 595
 596                 if (!(p2 = strchr(hexchars, toupper((unsigned char)strhex[i]))))
 597                         break;
 598
 599                 /* get the two nybbles */
 600                 hinybble = PTR_DIFF(p1, hexchars);
 601                 lonybble = PTR_DIFF(p2, hexchars);
 602
 603                 if (num_chars >= p_len) {
 604                         break;
 605                 }
 606
 607                 p[num_chars] = (hinybble << 4) | lonybble;
 608                 num_chars++;
 609
 610                 p1 = NULL;
 611                 p2 = NULL;
 612         }
 613         return num_chars;
 614 }
 615
 616 /**
 617  * Parse a hex string and return a data blob.
 618  */
 619 _PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex)
 620 {
 621         DATA_BLOB ret_blob = data_blob_talloc(mem_ctx, NULL, strlen(strhex)/2+1);
 622
 623         ret_blob.length = strhex_to_str((char *)ret_blob.data, ret_blob.length,
 624                                         strhex,
 625                                         strlen(strhex));
 626
 627         return ret_blob;
 628 }
 629
 630
 631 /**
 632  * Routine to print a buffer as HEX digits, into an allocated string.
 633  */
 634 _PUBLIC_ void hex_encode(const unsigned char *buff_in, size_t len, char **out_hex_buffer)
 635 {
 636         int i;
 637         char *hex_buffer;
 638
 639         *out_hex_buffer = malloc_array_p(char, (len*2)+1);
 640         hex_buffer = *out_hex_buffer;
 641
 642         for (i = 0; i < len; i++)
 643                 slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
 644 }
 645
 646 /**
 647  * talloc version of hex_encode()
 648  */
 649 _PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len)
 650 {
 651         int i;
 652         char *hex_buffer;
 653
 654         hex_buffer = talloc_array(mem_ctx, char, (len*2)+1);
 655         if (!hex_buffer) {
 656                 return NULL;
 657         }
 658
 659         for (i = 0; i < len; i++)
 660                 slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
 661
 662         talloc_set_name_const(hex_buffer, hex_buffer);
 663         return hex_buffer;
 664 }
 665
 666 /**
 667  Unescape a URL encoded string, in place.
 668 **/
 669
 670 _PUBLIC_ void rfc1738_unescape(char *buf)
 671 {
 672         char *p=buf;
 673
 674         while ((p=strchr(p,'+')))
 675                 *p = ' ';
 676
 677         p = buf;
 678
 679         while (p && *p && (p=strchr(p,'%'))) {
 680                 int c1 = p[1];
 681                 int c2 = p[2];
 682
 683                 if (c1 >= '0' && c1 <= '9')
 684                         c1 = c1 - '0';
 685                 else if (c1 >= 'A' && c1 <= 'F')
 686                         c1 = 10 + c1 - 'A';
 687                 else if (c1 >= 'a' && c1 <= 'f')
 688                         c1 = 10 + c1 - 'a';
 689                 else {p++; continue;}
 690
 691                 if (c2 >= '0' && c2 <= '9')
 692                         c2 = c2 - '0';
 693                 else if (c2 >= 'A' && c2 <= 'F')
 694                         c2 = 10 + c2 - 'A';
 695                 else if (c2 >= 'a' && c2 <= 'f')
 696                         c2 = 10 + c2 - 'a';
 697                 else {p++; continue;}
 698
 699                 *p = (c1<<4) | c2;
 700
 701                 memmove(p+1, p+3, strlen(p+3)+1);
 702                 p++;
 703         }
 704 }
 705
 706 /**
 707   varient of strcmp() that handles NULL ptrs
 708 **/
 709 _PUBLIC_ int strcmp_safe(const char *s1, const char *s2)
 710 {
 711         if (s1 == s2) {
 712                 return 0;
 713         }
 714         if (s1 == NULL || s2 == NULL) {
 715                 return s1?-1:1;
 716         }
 717         return strcmp(s1, s2);
 718 }
 719
 720
 721 /**
 722 return the number of bytes occupied by a buffer in ASCII format
 723 the result includes the null termination
 724 limited by 'n' bytes
 725 **/
 726 _PUBLIC_ size_t ascii_len_n(const char *src, size_t n)
 727 {
 728         size_t len;
 729
 730         len = strnlen(src, n);
 731         if (len+1 <= n) {
 732                 len += 1;
 733         }
 734
 735         return len;
 736 }
 737
 738 /**
 739  Set a boolean variable from the text value stored in the passed string.
 740  Returns true in success, false if the passed string does not correctly
 741  represent a boolean.
 742 **/
 743
 744 _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean)
 745 {
 746         if (strwicmp(boolean_string, "yes") == 0 ||
 747             strwicmp(boolean_string, "true") == 0 ||
 748             strwicmp(boolean_string, "on") == 0 ||
 749             strwicmp(boolean_string, "1") == 0) {
 750                 *boolean = true;
 751                 return true;
 752         } else if (strwicmp(boolean_string, "no") == 0 ||
 753                    strwicmp(boolean_string, "false") == 0 ||
 754                    strwicmp(boolean_string, "off") == 0 ||
 755                    strwicmp(boolean_string, "0") == 0) {
 756                 *boolean = false;
 757                 return true;
 758         }
 759         return false;
 760 }
 761
 762 /**
 763 return the number of bytes occupied by a buffer in CH_UTF16 format
 764 the result includes the null termination
 765 **/
 766 _PUBLIC_ size_t utf16_len(const void *buf)
 767 {
 768         size_t len;
 769
 770         for (len = 0; SVAL(buf,len); len += 2) ;
 771
 772         return len + 2;
 773 }
 774
 775 /**
 776 return the number of bytes occupied by a buffer in CH_UTF16 format
 777 the result includes the null termination
 778 limited by 'n' bytes
 779 **/
 780 _PUBLIC_ size_t utf16_len_n(const void *src, size_t n)
 781 {
 782         size_t len;
 783
 784         for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ;
 785
 786         if (len+2 <= n) {
 787                 len += 2;
 788         }
 789
 790         return len;
 791 }
 792
 793 /**
 794  * @file
 795  * @brief String utilities.
 796  **/
 797
 798 static bool next_token_internal_talloc(TALLOC_CTX *ctx,
 799                                 const char **ptr,
 800                                 char **pp_buff,
 801                                 const char *sep,
 802                                 bool ltrim)
 803 {
 804         char *s;
 805         char *saved_s;
 806         char *pbuf;
 807         bool quoted;
 808         size_t len=1;
 809
 810         *pp_buff = NULL;
 811         if (!ptr) {
 812                 return(false);
 813         }
 814
 815         s = (char *)*ptr;
 816
 817         /* default to simple separators */
 818         if (!sep) {
 819                 sep = " \t\n\r";
 820         }
 821
 822         /* find the first non sep char, if left-trimming is requested */
 823         if (ltrim) {
 824                 while (*s && strchr_m(sep,*s)) {
 825                         s++;
 826                 }
 827         }
 828
 829         /* nothing left? */
 830         if (!*s) {
 831                 return false;
 832         }
 833
 834         /* When restarting we need to go from here. */
 835         saved_s = s;
 836
 837         /* Work out the length needed. */
 838         for (quoted = false; *s &&
 839                         (quoted || !strchr_m(sep,*s)); s++) {
 840                 if (*s == '\"') {
 841                         quoted = !quoted;
 842                 } else {
 843                         len++;
 844                 }
 845         }
 846
 847         /* We started with len = 1 so we have space for the nul. */
 848         *pp_buff = talloc_array(ctx, char, len);
 849         if (!*pp_buff) {
 850                 return false;
 851         }
 852
 853         /* copy over the token */
 854         pbuf = *pp_buff;
 855         s = saved_s;
 856         for (quoted = false; *s &&
 857                         (quoted || !strchr_m(sep,*s)); s++) {
 858                 if ( *s == '\"' ) {
 859                         quoted = !quoted;
 860                 } else {
 861                         *pbuf++ = *s;
 862                 }
 863         }
 864
 865         *ptr = (*s) ? s+1 : s;
 866         *pbuf = 0;
 867
 868         return true;
 869 }
 870
 871 bool next_token_talloc(TALLOC_CTX *ctx,
 872                         const char **ptr,
 873                         char **pp_buff,
 874                         const char *sep)
 875 {
 876         return next_token_internal_talloc(ctx, ptr, pp_buff, sep, true);
 877 }
 878
 879 /*
 880  * Get the next token from a string, return false if none found.  Handles
 881  * double-quotes.  This version does not trim leading separator characters
 882  * before looking for a token.
 883  */
 884
 885 bool next_token_no_ltrim_talloc(TALLOC_CTX *ctx,
 886                         const char **ptr,
 887                         char **pp_buff,
 888                         const char *sep)
 889 {
 890         return next_token_internal_talloc(ctx, ptr, pp_buff, sep, false);
 891 }
 892
 893