dlls/msvcrt/misc.c

   1 /*
   2  * msvcrt.dll misc functions
   3  *
   4  * Copyright 2000 Jon Griffiths
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdlib.h>
  25
  26 #include "msvcrt.h"
  27 #include "wine/debug.h"
  28 #include "ntsecapi.h"
  29
  30 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
  31
  32 static unsigned int output_format;
  33
  34 /*********************************************************************
  35  *              _beep (MSVCRT.@)
  36  */
  37 void CDECL MSVCRT__beep( unsigned int freq, unsigned int duration)
  38 {
  39     TRACE(":Freq %d, Duration %d\n",freq,duration);
  40     Beep(freq, duration);
  41 }
  42
  43 /*********************************************************************
  44  *              srand (MSVCRT.@)
  45  */
  46 void CDECL MSVCRT_srand( unsigned int seed )
  47 {
  48     thread_data_t *data = msvcrt_get_thread_data();
  49     data->random_seed = seed;
  50 }
  51
  52 /*********************************************************************
  53  *              rand (MSVCRT.@)
  54  */
  55 int CDECL MSVCRT_rand(void)
  56 {
  57     thread_data_t *data = msvcrt_get_thread_data();
  58
  59     /* this is the algorithm used by MSVC, according to
  60      * http://en.wikipedia.org/wiki/List_of_pseudorandom_number_generators */
  61     data->random_seed = data->random_seed * 214013 + 2531011;
  62     return (data->random_seed >> 16) & MSVCRT_RAND_MAX;
  63 }
  64
  65 /*********************************************************************
  66  *              rand_s (MSVCRT.@)
  67  */
  68 int CDECL MSVCRT_rand_s(unsigned int *pval)
  69 {
  70     if (!pval || !RtlGenRandom(pval, sizeof(*pval)))
  71     {
  72         *MSVCRT__errno() = MSVCRT_EINVAL;
  73         return MSVCRT_EINVAL;
  74     }
  75     return 0;
  76 }
  77
  78 /*********************************************************************
  79  *              _sleep (MSVCRT.@)
  80  */
  81 void CDECL MSVCRT__sleep(MSVCRT_ulong timeout)
  82 {
  83   TRACE("_sleep for %d milliseconds\n",timeout);
  84   Sleep((timeout)?timeout:1);
  85 }
  86
  87 /*********************************************************************
  88  *              _lfind (MSVCRT.@)
  89  */
  90 void* CDECL _lfind(const void* match, const void* start,
  91                    unsigned int* array_size, unsigned int elem_size,
  92                    int (CDECL *cf)(const void*,const void*) )
  93 {
  94   unsigned int size = *array_size;
  95   if (size)
  96     do
  97     {
  98       if (cf(match, start) == 0)
  99         return (void *)start; /* found */
 100       start = (const char *)start + elem_size;
 101     } while (--size);
 102   return NULL;
 103 }
 104
 105 /*********************************************************************
 106  *              _lfind_s (MSVCRT.@)
 107  */
 108 void* CDECL _lfind_s(const void* match, const void* start,
 109                    unsigned int* array_size, unsigned int elem_size,
 110                    int (CDECL *cf)(void*,const void*,const void*),
 111                    void* context)
 112 {
 113   unsigned int size;
 114   if (!MSVCRT_CHECK_PMT(match != NULL)) return NULL;
 115   if (!MSVCRT_CHECK_PMT(array_size != NULL)) return NULL;
 116   if (!MSVCRT_CHECK_PMT(start != NULL || *array_size == 0)) return NULL;
 117   if (!MSVCRT_CHECK_PMT(cf != NULL)) return NULL;
 118   if (!MSVCRT_CHECK_PMT(elem_size != 0)) return NULL;
 119
 120   size = *array_size;
 121   if (size)
 122     do
 123     {
 124       if (cf(context, match, start) == 0)
 125         return (void *)start; /* found */
 126       start = (const char *)start + elem_size;
 127     } while (--size);
 128   return NULL;
 129 }
 130
 131 /*********************************************************************
 132  *              _lsearch (MSVCRT.@)
 133  */
 134 void* CDECL _lsearch(const void* match, void* start,
 135                      unsigned int* array_size, unsigned int elem_size,
 136                      int (CDECL *cf)(const void*,const void*) )
 137 {
 138   unsigned int size = *array_size;
 139   if (size)
 140     do
 141     {
 142       if (cf(match, start) == 0)
 143         return start; /* found */
 144       start = (char*)start + elem_size;
 145     } while (--size);
 146
 147   /* not found, add to end */
 148   memcpy(start, match, elem_size);
 149   array_size[0]++;
 150   return start;
 151 }
 152
 153 /*********************************************************************
 154  *                  bsearch_s (msvcrt.@)
 155  */
 156 void* CDECL MSVCRT_bsearch_s(const void *key, const void *base,
 157                              MSVCRT_size_t nmemb, MSVCRT_size_t size,
 158                              int (__cdecl *compare)(void *, const void *, const void *), void *ctx)
 159 {
 160     ssize_t min = 0;
 161     ssize_t max = nmemb - 1;
 162
 163     if (!MSVCRT_CHECK_PMT(size != 0)) return NULL;
 164     if (!MSVCRT_CHECK_PMT(compare != NULL)) return NULL;
 165
 166     while (min <= max)
 167     {
 168         ssize_t cursor = min + (max - min) / 2;
 169         int ret = compare(ctx, key,(const char *)base+(cursor*size));
 170         if (!ret)
 171             return (char*)base+(cursor*size);
 172         if (ret < 0)
 173             max = cursor - 1;
 174         else
 175             min = cursor + 1;
 176     }
 177     return NULL;
 178 }
 179
 180 static int CDECL compare_wrapper(void *ctx, const void *e1, const void *e2)
 181 {
 182     int (__cdecl *compare)(const void *, const void *) = ctx;
 183     return compare(e1, e2);
 184 }
 185
 186 /*********************************************************************
 187  *                  bsearch (msvcrt.@)
 188  */
 189 void* CDECL MSVCRT_bsearch(const void *key, const void *base, MSVCRT_size_t nmemb,
 190         MSVCRT_size_t size, int (__cdecl *compar)(const void *, const void *))
 191 {
 192     return MSVCRT_bsearch_s(key, base, nmemb, size, compare_wrapper, compar);
 193 }
 194 /*********************************************************************
 195  *              _chkesp (MSVCRT.@)
 196  *
 197  * Trap to a debugger if the value of the stack pointer has changed.
 198  *
 199  * PARAMS
 200  *  None.
 201  *
 202  * RETURNS
 203  *  Does not return.
 204  *
 205  * NOTES
 206  *  This function is available for iX86 only.
 207  *
 208  *  When VC++ generates debug code, it stores the value of the stack pointer
 209  *  before calling any external function, and checks the value following
 210  *  the call. It then calls this function, which will trap if the values are
 211  *  not the same. Usually this means that the prototype used to call
 212  *  the function is incorrect.  It can also mean that the .spec entry has
 213  *  the wrong calling convention or parameters.
 214  */
 215 #ifdef __i386__
 216
 217 # ifdef __GNUC__
 218
 219 __ASM_GLOBAL_FUNC(_chkesp,
 220                   "jnz 1f\n\t"
 221                   "ret\n"
 222                   "1:\tpushl %ebp\n\t"
 223                   __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
 224                   __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
 225                   "movl %esp,%ebp\n\t"
 226                   __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
 227                   "subl $12,%esp\n\t"
 228                   "pushl %eax\n\t"
 229                   "pushl %ecx\n\t"
 230                   "pushl %edx\n\t"
 231                   "call " __ASM_NAME("MSVCRT_chkesp_fail") "\n\t"
 232                   "popl %edx\n\t"
 233                   "popl %ecx\n\t"
 234                   "popl %eax\n\t"
 235                   "leave\n\t"
 236                   __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
 237                   __ASM_CFI(".cfi_same_value %ebp\n\t")
 238                   "ret")
 239
 240 void CDECL DECLSPEC_HIDDEN MSVCRT_chkesp_fail(void)
 241 {
 242   ERR("Stack pointer incorrect after last function call - Bad prototype/spec entry?\n");
 243   DebugBreak();
 244 }
 245
 246 # else  /* __GNUC__ */
 247
 248 /**********************************************************************/
 249
 250 void CDECL _chkesp(void)
 251 {
 252 }
 253
 254 # endif  /* __GNUC__ */
 255
 256 #endif  /* __i386__ */
 257
 258 static inline void swap(char *l, char *r, MSVCRT_size_t size)
 259 {
 260     char tmp;
 261
 262     while(size--) {
 263         tmp = *l;
 264         *l++ = *r;
 265         *r++ = tmp;
 266     }
 267 }
 268
 269 static void small_sort(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
 270         int (CDECL *compar)(void *, const void *, const void *), void *context)
 271 {
 272     MSVCRT_size_t e, i;
 273     char *max, *p;
 274
 275     for(e=nmemb; e>1; e--) {
 276         max = base;
 277         for(i=1; i<e; i++) {
 278             p = (char*)base + i*size;
 279             if(compar(context, p, max) > 0)
 280                 max = p;
 281         }
 282
 283         if(p != max)
 284             swap(p, max, size);
 285     }
 286 }
 287
 288 static void quick_sort(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
 289         int (CDECL *compar)(void *, const void *, const void *), void *context)
 290 {
 291     MSVCRT_size_t stack_lo[8*sizeof(MSVCRT_size_t)], stack_hi[8*sizeof(MSVCRT_size_t)];
 292     MSVCRT_size_t beg, end, lo, hi, med;
 293     int stack_pos;
 294
 295     stack_pos = 0;
 296     stack_lo[stack_pos] = 0;
 297     stack_hi[stack_pos] = nmemb-1;
 298
 299 #define X(i) ((char*)base+size*(i))
 300     while(stack_pos >= 0) {
 301         beg = stack_lo[stack_pos];
 302         end = stack_hi[stack_pos--];
 303
 304         if(end-beg < 8) {
 305             small_sort(X(beg), end-beg+1, size, compar, context);
 306             continue;
 307         }
 308
 309         lo = beg;
 310         hi = end;
 311         med = lo + (hi-lo+1)/2;
 312         if(compar(context, X(lo), X(med)) > 0)
 313             swap(X(lo), X(med), size);
 314         if(compar(context, X(lo), X(hi)) > 0)
 315             swap(X(lo), X(hi), size);
 316         if(compar(context, X(med), X(hi)) > 0)
 317             swap(X(med), X(hi), size);
 318
 319         lo++;
 320         hi--;
 321         while(1) {
 322             while(lo <= hi) {
 323                 if(lo!=med && compar(context, X(lo), X(med))>0)
 324                     break;
 325                 lo++;
 326             }
 327
 328             while(med != hi) {
 329                 if(compar(context, X(hi), X(med)) <= 0)
 330                     break;
 331                 hi--;
 332             }
 333
 334             if(hi < lo)
 335                 break;
 336
 337             swap(X(lo), X(hi), size);
 338             if(hi == med)
 339                 med = lo;
 340             lo++;
 341             hi--;
 342         }
 343
 344         while(hi > beg) {
 345             if(hi!=med && compar(context, X(hi), X(med))!=0)
 346                 break;
 347             hi--;
 348         }
 349
 350         if(hi-beg >= end-lo) {
 351             stack_lo[++stack_pos] = beg;
 352             stack_hi[stack_pos] = hi;
 353             stack_lo[++stack_pos] = lo;
 354             stack_hi[stack_pos] = end;
 355         }else {
 356             stack_lo[++stack_pos] = lo;
 357             stack_hi[stack_pos] = end;
 358             stack_lo[++stack_pos] = beg;
 359             stack_hi[stack_pos] = hi;
 360         }
 361     }
 362 #undef X
 363 }
 364
 365 /*********************************************************************
 366  * qsort_s (MSVCRT.@)
 367  *
 368  * This function is trying to sort data doing identical comparisons
 369  * as native does. There are still cases where it behaves differently.
 370  */
 371 void CDECL MSVCRT_qsort_s(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
 372     int (CDECL *compar)(void *, const void *, const void *), void *context)
 373 {
 374     const MSVCRT_size_t total_size = nmemb*size;
 375
 376     if (!MSVCRT_CHECK_PMT(base != NULL || (base == NULL && nmemb == 0))) return;
 377     if (!MSVCRT_CHECK_PMT(size > 0)) return;
 378     if (!MSVCRT_CHECK_PMT(compar != NULL)) return;
 379     if (total_size / size != nmemb) return;
 380
 381     if (nmemb < 2) return;
 382
 383     quick_sort(base, nmemb, size, compar, context);
 384 }
 385
 386 /*********************************************************************
 387  * qsort (MSVCRT.@)
 388  */
 389 void CDECL MSVCRT_qsort(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
 390         int (CDECL *compar)(const void*, const void*))
 391 {
 392     MSVCRT_qsort_s(base, nmemb, size, compare_wrapper, compar);
 393 }
 394
 395 /*********************************************************************
 396  * _get_output_format (MSVCRT.@)
 397  */
 398 unsigned int CDECL MSVCRT__get_output_format(void)
 399 {
 400    return output_format;
 401 }
 402
 403 /*********************************************************************
 404  * _set_output_format (MSVCRT.@)
 405  */
 406 unsigned int CDECL MSVCRT__set_output_format(unsigned int new_output_format)
 407 {
 408     unsigned int ret = output_format;
 409
 410     if(!MSVCRT_CHECK_PMT(new_output_format==0 || new_output_format==MSVCRT__TWO_DIGIT_EXPONENT))
 411         return ret;
 412
 413     output_format = new_output_format;
 414     return ret;
 415 }
 416
 417 /*********************************************************************
 418  * _resetstkoflw (MSVCRT.@)
 419  */
 420 int CDECL MSVCRT__resetstkoflw(void)
 421 {
 422     int stack_addr;
 423     DWORD oldprot;
 424
 425     /* causes stack fault that updates NtCurrentTeb()->Tib.StackLimit */
 426     return VirtualProtect(&stack_addr, 1, PAGE_GUARD|PAGE_READWRITE, &oldprot);
 427 }
 428
 429 /*********************************************************************
 430  *  _decode_pointer (MSVCR90.@)
 431  */
 432 void * CDECL MSVCRT_decode_pointer(void * ptr)
 433 {
 434     return DecodePointer(ptr);
 435 }
 436
 437 /*********************************************************************
 438  *  _encode_pointer (MSVCR90.@)
 439  */
 440 void * CDECL MSVCRT_encode_pointer(void * ptr)
 441 {
 442     return EncodePointer(ptr);
 443 }
 444
 445 /*********************************************************************
 446  *  _encoded_null (MSVCR100.@)
 447  */
 448 void * CDECL _encoded_null(void)
 449 {
 450     TRACE("\n");
 451
 452     return EncodePointer(NULL);
 453 }
 454
 455 /*********************************************************************
 456  * _CRT_RTC_INIT (MSVCR100.@)
 457  */
 458 void* CDECL _CRT_RTC_INIT(void *unk1, void *unk2, int unk3, int unk4, int unk5)
 459 {
 460     TRACE("%p %p %x %x %x\n", unk1, unk2, unk3, unk4, unk5);
 461     return NULL;
 462 }
 463
 464 /*********************************************************************
 465  * _CRT_RTC_INITW (MSVCR100.@)
 466  */
 467 void* CDECL _CRT_RTC_INITW(void *unk1, void *unk2, int unk3, int unk4, int unk5)
 468 {
 469     TRACE("%p %p %x %x %x\n", unk1, unk2, unk3, unk4, unk5);
 470     return NULL;
 471 }
 472
 473 /*********************************************************************
 474  * _byteswap_ushort (MSVCR100.@)
 475  */
 476 unsigned short CDECL _byteswap_ushort(unsigned short s)
 477 {
 478     return (s<<8) + (s>>8);
 479 }
 480
 481 /*********************************************************************
 482  * _byteswap_ulong (MSVCR100.@)
 483  */
 484 ULONG CDECL MSVCRT__byteswap_ulong(ULONG l)
 485 {
 486     return (l<<24) + ((l<<8)&0xFF0000) + ((l>>8)&0xFF00) + (l>>24);
 487 }
 488
 489 /*********************************************************************
 490  * _byteswap_uint64 (MSVCR100.@)
 491  */
 492 unsigned __int64 CDECL _byteswap_uint64(unsigned __int64 i)
 493 {
 494     return (i<<56) + ((i&0xFF00)<<40) + ((i&0xFF0000)<<24) + ((i&0xFF000000)<<8) +
 495         ((i>>8)&0xFF000000) + ((i>>24)&0xFF0000) + ((i>>40)&0xFF00) + (i>>56);
 496 }
 497
 498 /*********************************************************************
 499  *  __crtGetShowWindowMode (MSVCR110.@)
 500  */
 501 int CDECL MSVCR110__crtGetShowWindowMode(void)
 502 {
 503     STARTUPINFOW si;
 504
 505     GetStartupInfoW(&si);
 506     TRACE("window=%d\n", si.wShowWindow);
 507     return si.wShowWindow;
 508 }
 509
 510 /*********************************************************************
 511  *  __crtInitializeCriticalSectionEx (MSVCR110.@)
 512  */
 513 BOOL CDECL MSVCR110__crtInitializeCriticalSectionEx(
 514         CRITICAL_SECTION *cs, DWORD spin_count, DWORD flags)
 515 {
 516     TRACE("(%p %x %x)\n", cs, spin_count, flags);
 517     return InitializeCriticalSectionEx(cs, spin_count, flags);
 518 }
 519
 520 /*********************************************************************
 521  * _vacopy (MSVCR120.@)
 522  */
 523 void CDECL MSVCR120__vacopy(__ms_va_list *dest, __ms_va_list src)
 524 {
 525     __ms_va_copy(*dest, src);
 526 }
 527
 528 /*********************************************************************
 529  * _crt_debugger_hook (MSVCR80.@)
 530  */
 531 void CDECL MSVCRT__crt_debugger_hook(int reserved)
 532 {
 533     WARN("(%x)\n", reserved);
 534 }
 535
 536 /*********************************************************************
 537  *  __crtUnhandledException (MSVCR110.@)
 538  */
 539 LONG CDECL MSVCRT__crtUnhandledException(EXCEPTION_POINTERS *ep)
 540 {
 541     TRACE("(%p)\n", ep);
 542     SetUnhandledExceptionFilter(NULL);
 543     return UnhandledExceptionFilter(ep);
 544 }
 545
 546 /*********************************************************************
 547  *              __crtSleep (MSVCR120.@)
 548  */
 549 void CDECL MSVCRT__crtSleep(DWORD timeout)
 550 {
 551   TRACE("(%u)\n", timeout);
 552   Sleep(timeout);
 553 }