source3/lib/util_unistr.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Andrew Tridgell 1992-2001
   5    Copyright (C) Simo Sorce 2001
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 #ifndef MAXUNI
  25 #define MAXUNI 1024
  26 #endif
  27
  28 /* these 3 tables define the unicode case handling.  They are loaded
  29    at startup either via mmap() or read() from the lib directory */
  30 static smb_ucs2_t *upcase_table;
  31 static smb_ucs2_t *lowcase_table;
  32 static uint8 *valid_table;
  33
  34 /**
  35  * This table says which Unicode characters are valid dos
  36  * characters.
  37  *
  38  * Each value is just a single bit.
  39  **/
  40 static uint8 doschar_table[8192]; /* 65536 characters / 8 bits/byte */
  41
  42
  43 /**
  44  * Load or generate the case handling tables.
  45  *
  46  * The case tables are defined in UCS2 and don't depend on any
  47  * configured parameters, so they never need to be reloaded.
  48  **/
  49 void load_case_tables(void)
  50 {
  51         static int initialised;
  52         int i;
  53
  54         if (initialised) return;
  55         initialised = 1;
  56
  57         upcase_table = map_file(lib_path("upcase.dat"), 0x20000);
  58         lowcase_table = map_file(lib_path("lowcase.dat"), 0x20000);
  59
  60         /* we would like Samba to limp along even if these tables are
  61            not available */
  62         if (!upcase_table) {
  63                 DEBUG(1,("creating lame upcase table\n"));
  64                 upcase_table = malloc(0x20000);
  65                 for (i=0;i<0x10000;i++) {
  66                         smb_ucs2_t v;
  67                         SSVAL(&v, 0, i);
  68                         upcase_table[v] = i;
  69                 }
  70                 for (i=0;i<256;i++) {
  71                         smb_ucs2_t v;
  72                         SSVAL(&v, 0, UCS2_CHAR(i));
  73                         upcase_table[v] = UCS2_CHAR(islower(i)?toupper(i):i);
  74                 }
  75         }
  76
  77         if (!lowcase_table) {
  78                 DEBUG(1,("creating lame lowcase table\n"));
  79                 lowcase_table = malloc(0x20000);
  80                 for (i=0;i<0x10000;i++) {
  81                         smb_ucs2_t v;
  82                         SSVAL(&v, 0, i);
  83                         lowcase_table[v] = i;
  84                 }
  85                 for (i=0;i<256;i++) {
  86                         smb_ucs2_t v;
  87                         SSVAL(&v, 0, UCS2_CHAR(i));
  88                         lowcase_table[v] = UCS2_CHAR(isupper(i)?tolower(i):i);
  89                 }
  90         }
  91 }
  92
  93 /*
  94   see if a ucs2 character can be mapped correctly to a dos character
  95   and mapped back to the same character in ucs2
  96 */
  97 int check_dos_char(smb_ucs2_t c)
  98 {
  99         lazy_initialize_conv();
 100
 101         /* Find the right byte, and right bit within the byte; return
 102          * 1 or 0 */
 103         return (doschar_table[(c & 0xffff) / 8] & (1 << (c & 7))) != 0;
 104 }
 105
 106
 107 static int check_dos_char_slowly(smb_ucs2_t c)
 108 {
 109         char buf[10];
 110         smb_ucs2_t c2 = 0;
 111         int len1, len2;
 112         len1 = convert_string(CH_UCS2, CH_DOS, &c, 2, buf, sizeof(buf));
 113         if (len1 == 0) return 0;
 114         len2 = convert_string(CH_DOS, CH_UCS2, buf, len1, &c2, 2);
 115         if (len2 != 2) return 0;
 116         return (c == c2);
 117 }
 118
 119
 120 /**
 121  * Fill out doschar table the hard way, by examining each character
 122  **/
 123 void init_doschar_table(void)
 124 {
 125         int i, j, byteval;
 126
 127         /* For each byte of packed table */
 128
 129         for (i = 0; i <= 0xffff; i += 8) {
 130                 byteval = 0;
 131                 for (j = 0; j <= 7; j++) {
 132                         smb_ucs2_t c;
 133
 134                         c = i + j;
 135
 136                         if (check_dos_char_slowly(c))
 137                                 byteval |= 1 << j;
 138                 }
 139                 doschar_table[i/8] = byteval;
 140         }
 141 }
 142
 143
 144 /**
 145  * Load the valid character map table from <tt>valid.dat</tt> or
 146  * create from the configured codepage.
 147  *
 148  * This function is called whenever the configuration is reloaded.
 149  * However, the valid character table is not changed if it's loaded
 150  * from a file, because we can't unmap files.
 151  **/
 152 void init_valid_table(void)
 153 {
 154         static int mapped_file;
 155         int i;
 156         const char *allowed = ".!#$%&'()_-@^`~";
 157         uint8 *valid_file;
 158
 159         if (mapped_file) {
 160                 /* Can't unmap files, so stick with what we have */
 161                 return;
 162         }
 163
 164         valid_file = map_file(lib_path("valid.dat"), 0x10000);
 165         if (valid_file) {
 166                 valid_table = valid_file;
 167                 mapped_file = 1;
 168                 return;
 169         }
 170
 171         /* Otherwise, we're using a dynamically created valid_table.
 172          * It might need to be regenerated if the code page changed.
 173          * We know that we're not using a mapped file, so we can
 174          * free() the old one. */
 175         if (valid_table) free(valid_table);
 176
 177         DEBUG(2,("creating default valid table\n"));
 178         valid_table = malloc(0x10000);
 179         for (i=0;i<128;i++)
 180                 valid_table[i] = isalnum(i) || strchr(allowed,i);
 181
 182         for (;i<0x10000;i++) {
 183                 smb_ucs2_t c;
 184                 SSVAL(&c, 0, i);
 185                 valid_table[i] = check_dos_char(c);
 186         }
 187 }
 188
 189
 190
 191 /*******************************************************************
 192  Write a string in (little-endian) unicode format. src is in
 193  the current DOS codepage. len is the length in bytes of the
 194  string pointed to by dst.
 195
 196  if null_terminate is True then null terminate the packet (adds 2 bytes)
 197
 198  the return value is the length in bytes consumed by the string, including the
 199  null termination if applied
 200 ********************************************************************/
 201
 202 size_t dos_PutUniCode(char *dst,const char *src, ssize_t len, BOOL null_terminate)
 203 {
 204         return push_ucs2(NULL, dst, src, len,
 205                          STR_UNICODE|STR_NOALIGN | (null_terminate?STR_TERMINATE:0));
 206 }
 207
 208
 209 /*******************************************************************
 210  Skip past a unicode string, but not more than len. Always move
 211  past a terminating zero if found.
 212 ********************************************************************/
 213
 214 char *skip_unibuf(char *src, size_t len)
 215 {
 216     char *srcend = src + len;
 217
 218     while (src < srcend && SVAL(src,0))
 219         src += 2;
 220
 221     if(!SVAL(src,0))
 222         src += 2;
 223
 224     return src;
 225 }
 226
 227 /* Copy a string from little-endian or big-endian unicode source (depending
 228  * on flags) to internal samba format destination
 229  */
 230 int rpcstr_pull(char* dest, void *src, int dest_len, int src_len, int flags)
 231 {
 232         if (!src) return 0;
 233         if(dest_len==-1) dest_len=MAXUNI-3;
 234         return pull_ucs2(NULL, dest, src, dest_len, src_len, flags|STR_UNICODE|STR_NOALIGN);
 235 }
 236
 237 /* Copy a string from a unistr2 source to internal samba format
 238    destination.  Use this instead of direct calls to rpcstr_pull() to avoid
 239    having to determine whether the source string is null terminated. */
 240
 241 int rpcstr_pull_unistr2_fstring(char *dest, UNISTR2 *src)
 242 {
 243         return pull_ucs2(NULL, dest, src->buffer, sizeof(fstring),
 244                          src->uni_str_len * 2, 0);
 245 }
 246
 247 /* Converts a string from internal samba format to unicode
 248  */
 249 int rpcstr_push(void* dest, const char *src, int dest_len, int flags)
 250 {
 251         return push_ucs2(NULL, dest, src, dest_len, flags|STR_UNICODE|STR_NOALIGN);
 252 }
 253
 254 /*******************************************************************
 255  Return a DOS codepage version of a little-endian unicode string.
 256  len is the filename length (ignoring any terminating zero) in uin16
 257  units. Always null terminates.
 258  Hack alert: uses fixed buffer(s).
 259 ********************************************************************/
 260 char *dos_unistrn2(const uint16 *src, int len)
 261 {
 262         static char lbufs[8][MAXUNI];
 263         static int nexti;
 264         char *lbuf = lbufs[nexti];
 265         nexti = (nexti+1)%8;
 266         pull_ucs2(NULL, lbuf, src, MAXUNI-3, len*2, STR_NOALIGN);
 267         return lbuf;
 268 }
 269
 270 /*******************************************************************
 271  Convert a (little-endian) UNISTR2 structure to an ASCII string
 272 ********************************************************************/
 273 void unistr2_to_ascii(char *dest, const UNISTR2 *str, size_t maxlen)
 274 {
 275         if (str == NULL) {
 276                 *dest='\0';
 277                 return;
 278         }
 279         pull_ucs2(NULL, dest, str->buffer, maxlen, str->uni_str_len*2, STR_NOALIGN);
 280 }
 281
 282 /*******************************************************************
 283 give a static string for displaying a UNISTR2
 284 ********************************************************************/
 285 const char *unistr2_static(const UNISTR2 *str)
 286 {
 287         static pstring ret;
 288         unistr2_to_ascii(ret, str, sizeof(ret));
 289         return ret;
 290 }
 291
 292
 293 /*******************************************************************
 294  duplicate a UNISTR2 string into a null terminated char*
 295  using a talloc context
 296 ********************************************************************/
 297 char *unistr2_tdup(TALLOC_CTX *ctx, const UNISTR2 *str)
 298 {
 299         char *s;
 300         int maxlen = (str->uni_str_len+1)*4;
 301         if (!str->buffer) return NULL;
 302         s = (char *)talloc(ctx, maxlen); /* convervative */
 303         if (!s) return NULL;
 304         pull_ucs2(NULL, s, str->buffer, maxlen, str->uni_str_len*2,
 305                   STR_NOALIGN);
 306         return s;
 307 }
 308
 309
 310 /*******************************************************************
 311 Return a number stored in a buffer
 312 ********************************************************************/
 313
 314 uint32 buffer2_to_uint32(BUFFER2 *str)
 315 {
 316         if (str->buf_len == 4)
 317                 return IVAL(str->buffer, 0);
 318         else
 319                 return 0;
 320 }
 321
 322 /*******************************************************************
 323  Convert a wchar to upper case.
 324 ********************************************************************/
 325
 326 smb_ucs2_t toupper_w(smb_ucs2_t val)
 327 {
 328         return upcase_table[SVAL(&val,0)];
 329 }
 330
 331 /*******************************************************************
 332  Convert a wchar to lower case.
 333 ********************************************************************/
 334
 335 smb_ucs2_t tolower_w( smb_ucs2_t val )
 336 {
 337         return lowcase_table[SVAL(&val,0)];
 338
 339 }
 340
 341 /*******************************************************************
 342 determine if a character is lowercase
 343 ********************************************************************/
 344 BOOL islower_w(smb_ucs2_t c)
 345 {
 346         return upcase_table[SVAL(&c,0)] != c;
 347 }
 348
 349 /*******************************************************************
 350 determine if a character is uppercase
 351 ********************************************************************/
 352 BOOL isupper_w(smb_ucs2_t c)
 353 {
 354         return lowcase_table[SVAL(&c,0)] != c;
 355 }
 356
 357
 358 /*******************************************************************
 359 determine if a character is valid in a 8.3 name
 360 ********************************************************************/
 361 BOOL isvalid83_w(smb_ucs2_t c)
 362 {
 363         return valid_table[SVAL(&c,0)] != 0;
 364 }
 365
 366 /*******************************************************************
 367  Count the number of characters in a smb_ucs2_t string.
 368 ********************************************************************/
 369 size_t strlen_w(const smb_ucs2_t *src)
 370 {
 371         size_t len;
 372
 373         for(len = 0; *src++; len++) ;
 374
 375         return len;
 376 }
 377
 378 /*******************************************************************
 379  Count up to max number of characters in a smb_ucs2_t string.
 380 ********************************************************************/
 381 size_t strnlen_w(const smb_ucs2_t *src, size_t max)
 382 {
 383         size_t len;
 384
 385         for(len = 0; *src++ && (len < max); len++) ;
 386
 387         return len;
 388 }
 389
 390 /*******************************************************************
 391 wide strchr()
 392 ********************************************************************/
 393 smb_ucs2_t *strchr_w(const smb_ucs2_t *s, smb_ucs2_t c)
 394 {
 395         while (*s != 0) {
 396                 if (c == *s) return (smb_ucs2_t *)s;
 397                 s++;
 398         }
 399         if (c == *s) return (smb_ucs2_t *)s;
 400
 401         return NULL;
 402 }
 403
 404 smb_ucs2_t *strchr_wa(const smb_ucs2_t *s, char c)
 405 {
 406         return strchr_w(s, UCS2_CHAR(c));
 407 }
 408
 409 smb_ucs2_t *strrchr_w(const smb_ucs2_t *s, smb_ucs2_t c)
 410 {
 411         const smb_ucs2_t *p = s;
 412         int len = strlen_w(s);
 413         if (len == 0) return NULL;
 414         p += (len - 1);
 415         do {
 416                 if (c == *p) return (smb_ucs2_t *)p;
 417         } while (p-- != s);
 418         return NULL;
 419 }
 420
 421 /*******************************************************************
 422 wide strstr()
 423 ********************************************************************/
 424 smb_ucs2_t *strstr_w(const smb_ucs2_t *s, const smb_ucs2_t *ins)
 425 {
 426         smb_ucs2_t *r;
 427         size_t slen, inslen;
 428
 429         if (!s || !*s || !ins || !*ins) return NULL;
 430         slen = strlen_w(s);
 431         inslen = strlen_w(ins);
 432         r = (smb_ucs2_t *)s;
 433         while ((r = strchr_w(r, *ins))) {
 434                 if (strncmp_w(r, ins, inslen) == 0) return r;
 435                 r++;
 436         }
 437         return NULL;
 438 }
 439
 440 /*******************************************************************
 441  Convert a string to lower case.
 442  return True if any char is converted
 443 ********************************************************************/
 444 BOOL strlower_w(smb_ucs2_t *s)
 445 {
 446         BOOL ret = False;
 447         while (*s) {
 448                 smb_ucs2_t v = tolower_w(*s);
 449                 if (v != *s) {
 450                         *s = v;
 451                         ret = True;
 452                 }
 453                 s++;
 454         }
 455         return ret;
 456 }
 457
 458 /*******************************************************************
 459  Convert a string to upper case.
 460  return True if any char is converted
 461 ********************************************************************/
 462 BOOL strupper_w(smb_ucs2_t *s)
 463 {
 464         BOOL ret = False;
 465         while (*s) {
 466                 smb_ucs2_t v = toupper_w(*s);
 467                 if (v != *s) {
 468                         *s = v;
 469                         ret = True;
 470                 }
 471                 s++;
 472         }
 473         return ret;
 474 }
 475
 476 /*******************************************************************
 477   convert a string to "normal" form
 478 ********************************************************************/
 479 void strnorm_w(smb_ucs2_t *s)
 480 {
 481   extern int case_default;
 482   if (case_default == CASE_UPPER)
 483     strupper_w(s);
 484   else
 485     strlower_w(s);
 486 }
 487
 488 int strcmp_w(const smb_ucs2_t *a, const smb_ucs2_t *b)
 489 {
 490         while (*b && *a == *b) { a++; b++; }
 491         return (*a - *b);
 492         /* warning: if *a != *b and both are not 0 we retrun a random
 493                 greater or lesser than 0 number not realted to which
 494                 string is longer */
 495 }
 496
 497 int strncmp_w(const smb_ucs2_t *a, const smb_ucs2_t *b, size_t len)
 498 {
 499         size_t n = 0;
 500         while ((n < len) && *b && *a == *b) { a++; b++; n++;}
 501         return (len - n)?(*a - *b):0;
 502 }
 503
 504 /*******************************************************************
 505 case insensitive string comparison
 506 ********************************************************************/
 507 int strcasecmp_w(const smb_ucs2_t *a, const smb_ucs2_t *b)
 508 {
 509         while (*b && toupper_w(*a) == toupper_w(*b)) { a++; b++; }
 510         return (tolower_w(*a) - tolower_w(*b));
 511 }
 512
 513 /*******************************************************************
 514 case insensitive string comparison, lenght limited
 515 ********************************************************************/
 516 int strncasecmp_w(const smb_ucs2_t *a, const smb_ucs2_t *b, size_t len)
 517 {
 518         size_t n = 0;
 519         while ((n < len) && *b && (toupper_w(*a) == toupper_w(*b))) { a++; b++; n++; }
 520         return (len - n)?(tolower_w(*a) - tolower_w(*b)):0;
 521 }
 522
 523 /*******************************************************************
 524   compare 2 strings
 525 ********************************************************************/
 526 BOOL strequal_w(const smb_ucs2_t *s1, const smb_ucs2_t *s2)
 527 {
 528         if (s1 == s2) return(True);
 529         if (!s1 || !s2) return(False);
 530
 531         return(strcasecmp_w(s1,s2)==0);
 532 }
 533
 534 /*******************************************************************
 535   compare 2 strings up to and including the nth char.
 536   ******************************************************************/
 537 BOOL strnequal_w(const smb_ucs2_t *s1,const smb_ucs2_t *s2,size_t n)
 538 {
 539   if (s1 == s2) return(True);
 540   if (!s1 || !s2 || !n) return(False);
 541
 542   return(strncasecmp_w(s1,s2,n)==0);
 543 }
 544
 545 /*******************************************************************
 546 duplicate string
 547 ********************************************************************/
 548 smb_ucs2_t *strdup_w(const smb_ucs2_t *src)
 549 {
 550         return strndup_w(src, 0);
 551 }
 552
 553 /* if len == 0 then duplicate the whole string */
 554 smb_ucs2_t *strndup_w(const smb_ucs2_t *src, size_t len)
 555 {
 556         smb_ucs2_t *dest;
 557
 558         if (!len) len = strlen_w(src);
 559         dest = (smb_ucs2_t *)malloc((len + 1) * sizeof(smb_ucs2_t));
 560         if (!dest) {
 561                 DEBUG(0,("strdup_w: out of memory!\n"));
 562                 return NULL;
 563         }
 564
 565         memcpy(dest, src, len * sizeof(smb_ucs2_t));
 566         dest[len] = 0;
 567
 568         return dest;
 569 }
 570
 571 /*******************************************************************
 572 copy a string with max len
 573 ********************************************************************/
 574
 575 smb_ucs2_t *strncpy_w(smb_ucs2_t *dest, const smb_ucs2_t *src, const size_t max)
 576 {
 577         size_t len;
 578
 579         if (!dest || !src) return NULL;
 580
 581         for (len = 0; (src[len] != 0) && (len < max); len++)
 582                 dest[len] = src[len];
 583         while (len < max)
 584                 dest[len++] = 0;
 585
 586         return dest;
 587 }
 588
 589
 590 /*******************************************************************
 591 append a string of len bytes and add a terminator
 592 ********************************************************************/
 593
 594 smb_ucs2_t *strncat_w(smb_ucs2_t *dest, const smb_ucs2_t *src, const size_t max)
 595 {
 596         size_t start;
 597         size_t len;
 598
 599         if (!dest || !src) return NULL;
 600
 601         start = strlen_w(dest);
 602         len = strnlen_w(src, max);
 603
 604         memcpy(&dest[start], src, len*sizeof(smb_ucs2_t));
 605         dest[start+len] = 0;
 606
 607         return dest;
 608 }
 609
 610 smb_ucs2_t *strcat_w(smb_ucs2_t *dest, const smb_ucs2_t *src)
 611 {
 612         size_t start;
 613         size_t len;
 614
 615         if (!dest || !src) return NULL;
 616
 617         start = strlen_w(dest);
 618         len = strlen_w(src);
 619
 620         memcpy(&dest[start], src, len*sizeof(smb_ucs2_t));
 621         dest[start+len] = 0;
 622
 623         return dest;
 624 }
 625
 626
 627 /*******************************************************************
 628 replace any occurence of oldc with newc in unicode string
 629 ********************************************************************/
 630
 631 void string_replace_w(smb_ucs2_t *s, smb_ucs2_t oldc, smb_ucs2_t newc)
 632 {
 633         for(;*s;s++) {
 634                 if(*s==oldc) *s=newc;
 635         }
 636 }
 637
 638 /*******************************************************************
 639 trim unicode string
 640 ********************************************************************/
 641
 642 BOOL trim_string_w(smb_ucs2_t *s, const smb_ucs2_t *front,
 643                                   const smb_ucs2_t *back)
 644 {
 645         BOOL ret = False;
 646         size_t len, front_len, back_len;
 647
 648         if (!s || !*s) return False;
 649
 650         len = strlen_w(s);
 651
 652         if (front && *front) {
 653                 front_len = strlen_w(front);
 654                 while (len && strncmp_w(s, front, front_len) == 0) {
 655                         memmove(s, (s + front_len), (len - front_len + 1) * sizeof(smb_ucs2_t));
 656                         len -= front_len;
 657                         ret = True;
 658                 }
 659         }
 660
 661         if (back && *back) {
 662                 back_len = strlen_w(back);
 663                 while (len && strncmp_w((s + (len - back_len)), back, back_len) == 0) {
 664                         s[len - back_len] = 0;
 665                         len -= back_len;
 666                         ret = True;
 667                 }
 668         }
 669
 670         return ret;
 671 }
 672
 673 /*
 674   The *_wa() functions take a combination of 7 bit ascii
 675   and wide characters They are used so that you can use string
 676   functions combining C string constants with ucs2 strings
 677
 678   The char* arguments must NOT be multibyte - to be completely sure
 679   of this only pass string constants */
 680
 681
 682 void pstrcpy_wa(smb_ucs2_t *dest, const char *src)
 683 {
 684         int i;
 685         for (i=0;i<PSTRING_LEN;i++) {
 686                 dest[i] = UCS2_CHAR(src[i]);
 687                 if (src[i] == 0) return;
 688         }
 689 }
 690
 691 int strcmp_wa(const smb_ucs2_t *a, const char *b)
 692 {
 693         while (*b && *a == UCS2_CHAR(*b)) { a++; b++; }
 694         return (*a - UCS2_CHAR(*b));
 695 }
 696
 697 int strncmp_wa(const smb_ucs2_t *a, const char *b, size_t len)
 698 {
 699         size_t n = 0;
 700         while ((n < len) && *b && *a == UCS2_CHAR(*b)) { a++; b++; n++;}
 701         return (len - n)?(*a - UCS2_CHAR(*b)):0;
 702 }
 703
 704 smb_ucs2_t *strpbrk_wa(const smb_ucs2_t *s, const char *p)
 705 {
 706         while (*s != 0) {
 707                 int i;
 708                 for (i=0; p[i] && *s != UCS2_CHAR(p[i]); i++)
 709                         ;
 710                 if (p[i]) return (smb_ucs2_t *)s;
 711                 s++;
 712         }
 713         return NULL;
 714 }
 715
 716 smb_ucs2_t *strstr_wa(const smb_ucs2_t *s, const char *ins)
 717 {
 718         smb_ucs2_t *r;
 719         size_t slen, inslen;
 720
 721         if (!s || !*s || !ins || !*ins) return NULL;
 722         slen = strlen_w(s);
 723         inslen = strlen(ins);
 724         r = (smb_ucs2_t *)s;
 725         while ((r = strchr_w(r, UCS2_CHAR(*ins)))) {
 726                 if (strncmp_wa(r, ins, inslen) == 0) return r;
 727                 r++;
 728         }
 729         return NULL;
 730 }
 731
 732 /*******************************************************************
 733 copy a string with max len
 734 ********************************************************************/
 735
 736 smb_ucs2_t *strncpy_wa(smb_ucs2_t *dest, const char *src, const size_t max)
 737 {
 738         smb_ucs2_t *ucs2_src;
 739
 740         if (!dest || !src) return NULL;
 741         if (!(ucs2_src = acnv_uxu2(src)))
 742                 return NULL;
 743
 744         strncpy_w(dest, ucs2_src, max);
 745         SAFE_FREE(ucs2_src);
 746         return dest;
 747 }
 748
 749 /*******************************************************************
 750 convert and duplicate an ascii string
 751 ********************************************************************/
 752 smb_ucs2_t *strdup_wa(const char *src)
 753 {
 754         return strndup_wa(src, 0);
 755 }
 756
 757 /* if len == 0 then duplicate the whole string */
 758 smb_ucs2_t *strndup_wa(const char *src, size_t len)
 759 {
 760         smb_ucs2_t *dest, *s;
 761
 762         s = acnv_dosu2(src);
 763         if (!len) len = strlen_w(s);
 764         dest = (smb_ucs2_t *)malloc((len + 1) * sizeof(smb_ucs2_t));
 765         if (!dest) {
 766                 DEBUG(0,("strdup_w: out of memory!\n"));
 767                 SAFE_FREE(s);
 768                 return NULL;
 769         }
 770
 771         memcpy(dest, src, len * sizeof(smb_ucs2_t));
 772         dest[len] = 0;
 773
 774         SAFE_FREE(s);
 775         return dest;
 776 }
 777
 778 /*******************************************************************
 779 append a string of len bytes and add a terminator
 780 ********************************************************************/
 781
 782 smb_ucs2_t *strncat_wa(smb_ucs2_t *dest, const char *src, const size_t max)
 783 {
 784         smb_ucs2_t *ucs2_src;
 785
 786         if (!dest || !src) return NULL;
 787         if (!(ucs2_src = acnv_uxu2(src)))
 788                 return NULL;
 789
 790         strncat_w(dest, ucs2_src, max);
 791         SAFE_FREE(ucs2_src);
 792         return dest;
 793 }
 794
 795 smb_ucs2_t *strcat_wa(smb_ucs2_t *dest, const char *src)
 796 {
 797         smb_ucs2_t *ucs2_src;
 798
 799         if (!dest || !src) return NULL;
 800         if (!(ucs2_src = acnv_uxu2(src)))
 801                 return NULL;
 802
 803         strcat_w(dest, ucs2_src);
 804         SAFE_FREE(ucs2_src);
 805         return dest;
 806 }
 807
 808 BOOL trim_string_wa(smb_ucs2_t *s, const char *front,
 809                                   const char *back)
 810 {
 811         wpstring f, b;
 812
 813         if (front) push_ucs2(NULL, f, front, sizeof(wpstring) - 1, STR_TERMINATE);
 814         else *f = 0;
 815         if (back) push_ucs2(NULL, b, back, sizeof(wpstring) - 1, STR_TERMINATE);
 816         else *b = 0;
 817         return trim_string_w(s, f, b);
 818 }
 819
 820 /*******************************************************************
 821  returns the length in number of wide characters
 822  ******************************************************************/
 823 int unistrlen(uint16 *s)
 824 {
 825         int len;
 826
 827         if (!s)
 828                 return -1;
 829
 830         for (len=0; *s; s++,len++);
 831
 832         return len;
 833 }
 834
 835 /*******************************************************************
 836  Strcpy for unicode strings.  returns length (in num of wide chars)
 837 ********************************************************************/
 838
 839 int unistrcpy(uint16 *dst, uint16 *src)
 840 {
 841         int num_wchars = 0;
 842
 843         while (*src) {
 844                 *dst++ = *src++;
 845                 num_wchars++;
 846         }
 847         *dst = 0;
 848
 849         return num_wchars;
 850 }
 851
 852 /**
 853  * Samba ucs2 type to UNISTR2 conversion
 854  *
 855  * @param ctx Talloc context to create the dst strcture (if null) and the
 856  *            contents of the unicode string.
 857  * @param dst UNISTR2 destination. If equals null, then it's allocated.
 858  * @param src smb_ucs2_t source.
 859  * @param max_len maximum number of unicode characters to copy. If equals
 860  *        null, then null-termination of src is taken
 861  *
 862  * @return copied UNISTR2 destination
 863  **/
 864 UNISTR2* ucs2_to_unistr2(TALLOC_CTX *ctx, UNISTR2* dst, smb_ucs2_t* src)
 865 {
 866         size_t len;
 867
 868         if (!src) return NULL;
 869         len = strlen_w(src);
 870
 871         /* allocate UNISTR2 destination if not given */
 872         if (!dst) {
 873                 dst = (UNISTR2*) talloc(ctx, sizeof(UNISTR2));
 874                 if (!dst) return NULL;
 875         }
 876         if (!dst->buffer) {
 877                 dst->buffer = (uint16*) talloc(ctx, sizeof(uint16) * (len + 1));
 878                 if (!dst->buffer) return NULL;
 879         }
 880
 881         /* set UNISTR2 parameters */
 882         dst->uni_max_len = len + 1;
 883         dst->undoc = 0;
 884         dst->uni_str_len = len;
 885
 886         /* copy the actual unicode string */
 887         strncpy_w(dst->buffer, src, dst->uni_max_len);
 888
 889         return dst;
 890 };
 891