dlls/ntdll/string.c

   1 /*
   2  * NTDLL string functions
   3  *
   4  * Copyright 2000 Alexandre Julliard
   5  * Copyright 2000 Jon Griffiths
   6  * Copyright 2003 Thomas Mertes
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <ctype.h>
  27 #include <stdarg.h>
  28 #include <stdlib.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <search.h>
  32
  33 #include "windef.h"
  34 #include "winternl.h"
  35
  36
  37 /*********************************************************************
  38  *                  memchr   (NTDLL.@)
  39  */
  40 void * __cdecl NTDLL_memchr( const void *ptr, int c, size_t n )
  41 {
  42     return memchr( ptr, c, n );
  43 }
  44
  45
  46 /*********************************************************************
  47  *                  memcmp   (NTDLL.@)
  48  */
  49 int __cdecl NTDLL_memcmp( const void *ptr1, const void *ptr2, size_t n )
  50 {
  51     return memcmp( ptr1, ptr2, n );
  52 }
  53
  54
  55 /*********************************************************************
  56  *                  memcpy   (NTDLL.@)
  57  *
  58  * NOTES
  59  *  Behaves like memmove.
  60  */
  61 void * __cdecl NTDLL_memcpy( void *dst, const void *src, size_t n )
  62 {
  63     return memmove( dst, src, n );
  64 }
  65
  66
  67 /*********************************************************************
  68  *                  memmove   (NTDLL.@)
  69  */
  70 void * __cdecl NTDLL_memmove( void *dst, const void *src, size_t n )
  71 {
  72     return memmove( dst, src, n );
  73 }
  74
  75
  76 /*********************************************************************
  77  *                  memset   (NTDLL.@)
  78  */
  79 void * __cdecl NTDLL_memset( void *dst, int c, size_t n )
  80 {
  81     return memset( dst, c, n );
  82 }
  83
  84
  85 /*********************************************************************
  86  *                  bsearch   (NTDLL.@)
  87  */
  88 void * __cdecl NTDLL_bsearch( const void *key, const void *base, size_t nmemb,
  89                               size_t size, int (*compar)(const void *, const void *) )
  90 {
  91     return bsearch( key, base, nmemb, size, compar );
  92 }
  93
  94
  95 /*********************************************************************
  96  *                  qsort   (NTDLL.@)
  97  */
  98 void __cdecl NTDLL_qsort( void *base, size_t nmemb, size_t size,
  99                           int(*compar)(const void *, const void *) )
 100 {
 101     qsort( base, nmemb, size, compar );
 102 }
 103
 104
 105 /*********************************************************************
 106  *                  _lfind   (NTDLL.@)
 107  */
 108 void * __cdecl _lfind( const void *key, const void *base, unsigned int *nmemb,
 109                        size_t size, int(*compar)(const void *, const void *) )
 110 {
 111     size_t n = *nmemb;
 112     return lfind( key, base, &n, size, compar );
 113 }
 114
 115
 116 /*********************************************************************
 117  *                  strcat   (NTDLL.@)
 118  */
 119 char * __cdecl NTDLL_strcat( char *dst, const char *src )
 120 {
 121     return strcat( dst, src );
 122 }
 123
 124
 125 /*********************************************************************
 126  *                  strchr   (NTDLL.@)
 127  */
 128 char * __cdecl NTDLL_strchr( const char *str, int c )
 129 {
 130     return strchr( str, c );
 131 }
 132
 133
 134 /*********************************************************************
 135  *                  strcmp   (NTDLL.@)
 136  */
 137 int __cdecl NTDLL_strcmp( const char *str1, const char *str2 )
 138 {
 139     return strcmp( str1, str2 );
 140 }
 141
 142
 143 /*********************************************************************
 144  *                  strcpy   (NTDLL.@)
 145  */
 146 char * __cdecl NTDLL_strcpy( char *dst, const char *src )
 147 {
 148     return strcpy( dst, src );
 149 }
 150
 151
 152 /*********************************************************************
 153  *                  strcspn   (NTDLL.@)
 154  */
 155 size_t __cdecl NTDLL_strcspn( const char *str, const char *reject )
 156 {
 157     return strcspn( str, reject );
 158 }
 159
 160
 161 /*********************************************************************
 162  *                  strlen   (NTDLL.@)
 163  */
 164 size_t __cdecl NTDLL_strlen( const char *str )
 165 {
 166     return strlen( str );
 167 }
 168
 169
 170 /*********************************************************************
 171  *                  strncat   (NTDLL.@)
 172  */
 173 char * __cdecl NTDLL_strncat( char *dst, const char *src, size_t len )
 174 {
 175     return strncat( dst, src, len );
 176 }
 177
 178
 179 /*********************************************************************
 180  *                  strncmp   (NTDLL.@)
 181  */
 182 int __cdecl NTDLL_strncmp( const char *str1, const char *str2, size_t len )
 183 {
 184     return strncmp( str1, str2, len );
 185 }
 186
 187
 188 /*********************************************************************
 189  *                  strncpy   (NTDLL.@)
 190  */
 191 char * __cdecl NTDLL_strncpy( char *dst, const char *src, size_t len )
 192 {
 193     return strncpy( dst, src, len );
 194 }
 195
 196
 197 /*********************************************************************
 198  *                  strpbrk   (NTDLL.@)
 199  */
 200 char * __cdecl NTDLL_strpbrk( const char *str, const char *accept )
 201 {
 202     return strpbrk( str, accept );
 203 }
 204
 205
 206 /*********************************************************************
 207  *                  strrchr   (NTDLL.@)
 208  */
 209 char * __cdecl NTDLL_strrchr( const char *str, int c )
 210 {
 211     return strrchr( str, c );
 212 }
 213
 214
 215 /*********************************************************************
 216  *                  strspn   (NTDLL.@)
 217  */
 218 size_t __cdecl NTDLL_strspn( const char *str, const char *accept )
 219 {
 220     return strspn( str, accept );
 221 }
 222
 223
 224 /*********************************************************************
 225  *                  strstr   (NTDLL.@)
 226  */
 227 char * __cdecl NTDLL_strstr( const char *haystack, const char *needle )
 228 {
 229     return strstr( haystack, needle );
 230 }
 231
 232
 233 /*********************************************************************
 234  *                  _memccpy   (NTDLL.@)
 235  */
 236 void * __cdecl _memccpy( void *dst, const void *src, int c, size_t n )
 237 {
 238     return memccpy( dst, src, c, n );
 239 }
 240
 241
 242 /*********************************************************************
 243  *                  _memicmp   (NTDLL.@)
 244  *
 245  * Compare two blocks of memory as strings, ignoring case.
 246  *
 247  * PARAMS
 248  *  s1  [I] First string to compare to s2
 249  *  s2  [I] Second string to compare to s1
 250  *  len [I] Number of bytes to compare
 251  *
 252  * RETURNS
 253  *  An integer less than, equal to, or greater than zero indicating that
 254  *  s1 is less than, equal to or greater than s2 respectively.
 255  *
 256  * NOTES
 257  *  Any Nul characters in s1 or s2 are ignored. This function always
 258  *  compares up to len bytes or the first place where s1 and s2 differ.
 259  */
 260 INT __cdecl _memicmp( LPCSTR s1, LPCSTR s2, DWORD len )
 261 {
 262     int ret = 0;
 263     while (len--)
 264     {
 265         if ((ret = tolower(*s1) - tolower(*s2))) break;
 266         s1++;
 267         s2++;
 268     }
 269     return ret;
 270 }
 271
 272
 273 /*********************************************************************
 274  *                  _stricmp   (NTDLL.@)
 275  *                  _strcmpi   (NTDLL.@)
 276  */
 277 int __cdecl _stricmp( LPCSTR str1, LPCSTR str2 )
 278 {
 279     return strcasecmp( str1, str2 );
 280 }
 281
 282
 283 /*********************************************************************
 284  *                  _strnicmp   (NTDLL.@)
 285  */
 286 int __cdecl _strnicmp( LPCSTR str1, LPCSTR str2, size_t n )
 287 {
 288     return strncasecmp( str1, str2, n );
 289 }
 290
 291
 292 /*********************************************************************
 293  *                  _strupr   (NTDLL.@)
 294  *
 295  * Convert a string to upper case.
 296  *
 297  * PARAMS
 298  *  str [I/O] String to convert
 299  *
 300  * RETURNS
 301  *  str. There is no error return, if str is NULL or invalid, this
 302  *  function will crash.
 303  */
 304 LPSTR __cdecl _strupr( LPSTR str )
 305 {
 306     LPSTR ret = str;
 307     for ( ; *str; str++) *str = toupper(*str);
 308     return ret;
 309 }
 310
 311
 312 /*********************************************************************
 313  *                  _strlwr   (NTDLL.@)
 314  *
 315  * Convert a string to lowercase
 316  *
 317  * PARAMS
 318  *  str [I/O] String to convert
 319  *
 320  * RETURNS
 321  *  str. There is no error return, if str is NULL or invalid, this
 322  *  function will crash.
 323  */
 324 LPSTR __cdecl _strlwr( LPSTR str )
 325 {
 326     LPSTR ret = str;
 327     for ( ; *str; str++) *str = tolower(*str);
 328     return ret;
 329 }
 330
 331
 332 /*********************************************************************
 333  *                  tolower   (NTDLL.@)
 334  */
 335 int __cdecl NTDLL_tolower( int c )
 336 {
 337     return tolower( c );
 338 }
 339
 340
 341 /*********************************************************************
 342  *                  toupper   (NTDLL.@)
 343  */
 344 int __cdecl NTDLL_toupper( int c )
 345 {
 346     return toupper( c );
 347 }
 348
 349
 350 /*********************************************************************
 351  *                  isalnum   (NTDLL.@)
 352  */
 353 int __cdecl NTDLL_isalnum( int c )
 354 {
 355     return isalnum( c );
 356 }
 357
 358
 359 /*********************************************************************
 360  *                  isalpha   (NTDLL.@)
 361  */
 362 int __cdecl NTDLL_isalpha( int c )
 363 {
 364     return isalpha( c );
 365 }
 366
 367
 368 /*********************************************************************
 369  *                  iscntrl   (NTDLL.@)
 370  */
 371 int __cdecl NTDLL_iscntrl( int c )
 372 {
 373     return iscntrl( c );
 374 }
 375
 376
 377 /*********************************************************************
 378  *                  isdigit   (NTDLL.@)
 379  */
 380 int __cdecl NTDLL_isdigit( int c )
 381 {
 382     return isdigit( c );
 383 }
 384
 385
 386 /*********************************************************************
 387  *                  isgraph   (NTDLL.@)
 388  */
 389 int __cdecl NTDLL_isgraph( int c )
 390 {
 391     return isgraph( c );
 392 }
 393
 394
 395 /*********************************************************************
 396  *                  islower   (NTDLL.@)
 397  */
 398 int __cdecl NTDLL_islower( int c )
 399 {
 400     return islower( c );
 401 }
 402
 403
 404 /*********************************************************************
 405  *                  isprint   (NTDLL.@)
 406  */
 407 int __cdecl NTDLL_isprint( int c )
 408 {
 409     return isprint( c );
 410 }
 411
 412
 413 /*********************************************************************
 414  *                  ispunct   (NTDLL.@)
 415  */
 416 int __cdecl NTDLL_ispunct( int c )
 417 {
 418     return ispunct( c );
 419 }
 420
 421
 422 /*********************************************************************
 423  *                  isspace   (NTDLL.@)
 424  */
 425 int __cdecl NTDLL_isspace( int c )
 426 {
 427     return isspace( c );
 428 }
 429
 430
 431 /*********************************************************************
 432  *                  isupper   (NTDLL.@)
 433  */
 434 int __cdecl NTDLL_isupper( int c )
 435 {
 436     return isupper( c );
 437 }
 438
 439
 440 /*********************************************************************
 441  *                  isxdigit   (NTDLL.@)
 442  */
 443 int __cdecl NTDLL_isxdigit( int c )
 444 {
 445     return isxdigit( c );
 446 }
 447
 448
 449 /*********************************************************************
 450  *                  strtol   (NTDLL.@)
 451  */
 452 long __cdecl NTDLL_strtol( const char *nptr, char **endptr, int base )
 453 {
 454     return strtol( nptr, endptr, base );
 455 }
 456
 457
 458 /*********************************************************************
 459  *                  strtoul   (NTDLL.@)
 460  */
 461 unsigned long __cdecl NTDLL_strtoul( const char *nptr, char **endptr, int base )
 462 {
 463     return strtoul( nptr, endptr, base );
 464 }
 465
 466
 467 /*********************************************************************
 468  *                  atoi   (NTDLL.@)
 469  */
 470 int __cdecl NTDLL_atoi( const char *nptr )
 471 {
 472     return atoi( nptr );
 473 }
 474
 475
 476 /*********************************************************************
 477  *                  atol   (NTDLL.@)
 478  */
 479 long __cdecl NTDLL_atol( const char *nptr )
 480 {
 481     return atol( nptr );
 482 }
 483
 484
 485 /*********************************************************************
 486  *      _ultoa   (NTDLL.@)
 487  *
 488  * Convert an unsigned long integer to a string.
 489  *
 490  * RETURNS
 491  *  str.
 492  *
 493  * NOTES
 494  *  - Converts value to a Nul terminated string which is copied to str.
 495  *  - The maximum length of the copied str is 33 bytes.
 496  *  - Does not check if radix is in the range of 2 to 36.
 497  *  - If str is NULL it crashes, as the native function does.
 498  */
 499 char * __cdecl _ultoa(
 500     unsigned long value, /* [I] Value to be converted */
 501     char *str,           /* [O] Destination for the converted value */
 502     int radix)           /* [I] Number base for conversion */
 503 {
 504     char buffer[33];
 505     char *pos;
 506     int digit;
 507
 508     pos = &buffer[32];
 509     *pos = '\0';
 510
 511     do {
 512         digit = value % radix;
 513         value = value / radix;
 514         if (digit < 10) {
 515             *--pos = '0' + digit;
 516         } else {
 517             *--pos = 'a' + digit - 10;
 518         } /* if */
 519     } while (value != 0L);
 520
 521     memcpy(str, pos, &buffer[32] - pos + 1);
 522     return str;
 523 }
 524
 525
 526 /*********************************************************************
 527  *      _ltoa   (NTDLL.@)
 528  *
 529  * Convert a long integer to a string.
 530  *
 531  * RETURNS
 532  *  str.
 533  *
 534  * NOTES
 535  *  - Converts value to a Nul terminated string which is copied to str.
 536  *  - The maximum length of the copied str is 33 bytes. If radix
 537  *  is 10 and value is negative, the value is converted with sign.
 538  *  - Does not check if radix is in the range of 2 to 36.
 539  *  - If str is NULL it crashes, as the native function does.
 540  */
 541 char * __cdecl _ltoa(
 542     long value, /* [I] Value to be converted */
 543     char *str,  /* [O] Destination for the converted value */
 544     int radix)  /* [I] Number base for conversion */
 545 {
 546     unsigned long val;
 547     int negative;
 548     char buffer[33];
 549     char *pos;
 550     int digit;
 551
 552     if (value < 0 && radix == 10) {
 553         negative = 1;
 554         val = -value;
 555     } else {
 556         negative = 0;
 557         val = value;
 558     } /* if */
 559
 560     pos = &buffer[32];
 561     *pos = '\0';
 562
 563     do {
 564         digit = val % radix;
 565         val = val / radix;
 566         if (digit < 10) {
 567             *--pos = '0' + digit;
 568         } else {
 569             *--pos = 'a' + digit - 10;
 570         } /* if */
 571     } while (val != 0L);
 572
 573     if (negative) {
 574         *--pos = '-';
 575     } /* if */
 576
 577     memcpy(str, pos, &buffer[32] - pos + 1);
 578     return str;
 579 }
 580
 581
 582 /*********************************************************************
 583  *      _itoa    (NTDLL.@)
 584  *
 585  * Converts an integer to a string.
 586  *
 587  * RETURNS
 588  *  str.
 589  *
 590  * NOTES
 591  *  - Converts value to a '\0' terminated string which is copied to str.
 592  *  - The maximum length of the copied str is 33 bytes. If radix
 593  *  is 10 and value is negative, the value is converted with sign.
 594  *  - Does not check if radix is in the range of 2 to 36.
 595  *  - If str is NULL it crashes, as the native function does.
 596  */
 597 char * __cdecl _itoa(
 598     int value, /* [I] Value to be converted */
 599     char *str, /* [O] Destination for the converted value */
 600     int radix) /* [I] Number base for conversion */
 601 {
 602     return _ltoa(value, str, radix);
 603 }
 604
 605
 606 /*********************************************************************
 607  *      _ui64toa   (NTDLL.@)
 608  *
 609  * Converts a large unsigned integer to a string.
 610  *
 611  * RETURNS
 612  *  str.
 613  *
 614  * NOTES
 615  *  - Converts value to a '\0' terminated string which is copied to str.
 616  *  - The maximum length of the copied str is 65 bytes.
 617  *  - Does not check if radix is in the range of 2 to 36.
 618  *  - If str is NULL it crashes, as the native function does.
 619  */
 620 char * __cdecl _ui64toa(
 621     ULONGLONG value, /* [I] Value to be converted */
 622     char *str,       /* [O] Destination for the converted value */
 623     int radix)       /* [I] Number base for conversion */
 624 {
 625     char buffer[65];
 626     char *pos;
 627     int digit;
 628
 629     pos = &buffer[64];
 630     *pos = '\0';
 631
 632     do {
 633         digit = value % radix;
 634         value = value / radix;
 635         if (digit < 10) {
 636             *--pos = '0' + digit;
 637         } else {
 638             *--pos = 'a' + digit - 10;
 639         } /* if */
 640     } while (value != 0L);
 641
 642     memcpy(str, pos, &buffer[64] - pos + 1);
 643     return str;
 644 }
 645
 646
 647 /*********************************************************************
 648  *      _i64toa   (NTDLL.@)
 649  *
 650  * Converts a large integer to a string.
 651  *
 652  * RETURNS
 653  *  str.
 654  *
 655  * NOTES
 656  *  - Converts value to a Nul terminated string which is copied to str.
 657  *  - The maximum length of the copied str is 65 bytes. If radix
 658  *  is 10 and value is negative, the value is converted with sign.
 659  *  - Does not check if radix is in the range of 2 to 36.
 660  *  - If str is NULL it crashes, as the native function does.
 661  *
 662  * DIFFERENCES
 663  * - The native DLL converts negative values (for base 10) wrong:
 664  *|                     -1 is converted to -18446744073709551615
 665  *|                     -2 is converted to -18446744073709551614
 666  *|   -9223372036854775807 is converted to  -9223372036854775809
 667  *|   -9223372036854775808 is converted to  -9223372036854775808
 668  *   The native msvcrt _i64toa function and our ntdll _i64toa function
 669  *   do not have this bug.
 670  */
 671 char * __cdecl _i64toa(
 672     LONGLONG value, /* [I] Value to be converted */
 673     char *str,      /* [O] Destination for the converted value */
 674     int radix)      /* [I] Number base for conversion */
 675 {
 676     ULONGLONG val;
 677     int negative;
 678     char buffer[65];
 679     char *pos;
 680     int digit;
 681
 682     if (value < 0 && radix == 10) {
 683         negative = 1;
 684         val = -value;
 685     } else {
 686         negative = 0;
 687         val = value;
 688     } /* if */
 689
 690     pos = &buffer[64];
 691     *pos = '\0';
 692
 693     do {
 694         digit = val % radix;
 695         val = val / radix;
 696         if (digit < 10) {
 697             *--pos = '0' + digit;
 698         } else {
 699             *--pos = 'a' + digit - 10;
 700         } /* if */
 701     } while (val != 0L);
 702
 703     if (negative) {
 704         *--pos = '-';
 705     } /* if */
 706
 707     memcpy(str, pos, &buffer[64] - pos + 1);
 708     return str;
 709 }
 710
 711
 712 /*********************************************************************
 713  *      _atoi64   (NTDLL.@)
 714  *
 715  * Convert a string to a large integer.
 716  *
 717  * PARAMS
 718  *  str [I] String to be converted
 719  *
 720  * RETURNS
 721  *  Success: The integer value represented by str.
 722  *  Failure: 0. Note that this cannot be distinguished from a successful
 723  *           return, if the string contains "0".
 724  *
 725  * NOTES
 726  *  - Accepts: {whitespace} [+|-] {digits}
 727  *  - No check is made for value overflow, only the lower 64 bits are assigned.
 728  *  - If str is NULL it crashes, as the native function does.
 729  */
 730 LONGLONG __cdecl _atoi64( char *str )
 731 {
 732     ULONGLONG RunningTotal = 0;
 733     char bMinus = 0;
 734
 735     while (*str == ' ' || (*str >= '\011' && *str <= '\015')) {
 736         str++;
 737     } /* while */
 738
 739     if (*str == '+') {
 740         str++;
 741     } else if (*str == '-') {
 742         bMinus = 1;
 743         str++;
 744     } /* if */
 745
 746     while (*str >= '0' && *str <= '9') {
 747         RunningTotal = RunningTotal * 10 + *str - '0';
 748         str++;
 749     } /* while */
 750
 751     return bMinus ? -RunningTotal : RunningTotal;
 752 }
 753
 754
 755 /*********************************************************************
 756  *                  sprintf   (NTDLL.@)
 757  */
 758 int __cdecl NTDLL_sprintf( char *str, const char *format, ... )
 759 {
 760     int ret;
 761     va_list valist;
 762     va_start( valist, format );
 763     ret = vsprintf( str, format, valist );
 764     va_end( valist );
 765     return ret;
 766 }
 767
 768
 769 /*********************************************************************
 770  *                  vsprintf   (NTDLL.@)
 771  */
 772 int __cdecl NTDLL_vsprintf( char *str, const char *format, va_list args )
 773 {
 774     return vsprintf( str, format, args );
 775 }
 776
 777
 778 /*********************************************************************
 779  *                  _snprintf   (NTDLL.@)
 780  */
 781 int __cdecl _snprintf( char *str, size_t len, const char *format, ... )
 782 {
 783     int ret;
 784     va_list valist;
 785     va_start( valist, format );
 786     ret = vsnprintf( str, len, format, valist );
 787     va_end( valist );
 788     return ret;
 789 }
 790
 791
 792 /*********************************************************************
 793  *                  _vsnprintf   (NTDLL.@)
 794  */
 795 int __cdecl _vsnprintf( char *str, size_t len, const char *format, va_list args )
 796 {
 797     return vsnprintf( str, len, format, args );
 798 }
 799
 800
 801 /*********************************************************************
 802  *                  sscanf   (NTDLL.@)
 803  */
 804 int __cdecl NTDLL_sscanf( const char *str, const char *format, ... )
 805 {
 806     int ret;
 807     va_list valist;
 808     va_start( valist, format );
 809     ret = vsscanf( str, format, valist );
 810     va_end( valist );
 811     return ret;
 812 }
 813
 814
 815 /*********************************************************************
 816  *              _splitpath (NTDLL.@)
 817  *
 818  * Split a path into its component pieces.
 819  *
 820  * PARAMS
 821  *  inpath [I] Path to split
 822  *  drv    [O] Destination for drive component (e.g. "A:"). Must be at least 3 characters.
 823  *  dir    [O] Destination for directory component. Should be at least MAX_PATH characters.
 824  *  fname  [O] Destination for File name component. Should be at least MAX_PATH characters.
 825  *  ext    [O] Destination for file extension component. Should be at least MAX_PATH characters.
 826  *
 827  * RETURNS
 828  *  Nothing.
 829  */
 830 void __cdecl _splitpath(const char* inpath, char * drv, char * dir,
 831                         char* fname, char * ext )
 832 {
 833     const char *p, *end;
 834
 835     if (inpath[0] && inpath[1] == ':')
 836     {
 837         if (drv)
 838         {
 839             drv[0] = inpath[0];
 840             drv[1] = inpath[1];
 841             drv[2] = 0;
 842         }
 843         inpath += 2;
 844     }
 845     else if (drv) drv[0] = 0;
 846
 847     /* look for end of directory part */
 848     end = NULL;
 849     for (p = inpath; *p; p++) if (*p == '/' || *p == '\\') end = p + 1;
 850
 851     if (end)  /* got a directory */
 852     {
 853         if (dir)
 854         {
 855             memcpy( dir, inpath, end - inpath );
 856             dir[end - inpath] = 0;
 857         }
 858         inpath = end;
 859     }
 860     else if (dir) dir[0] = 0;
 861
 862     /* look for extension: what's after the last dot */
 863     end = NULL;
 864     for (p = inpath; *p; p++) if (*p == '.') end = p;
 865
 866     if (!end) end = p; /* there's no extension */
 867
 868     if (fname)
 869     {
 870         memcpy( fname, inpath, end - inpath );
 871         fname[end - inpath] = 0;
 872     }
 873     if (ext) strcpy( ext, end );
 874 }