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  *              _lsearch (MSVCRT.@)
 107  */
 108 void* CDECL _lsearch(const void* match, void* start,
 109                      unsigned int* array_size, unsigned int elem_size,
 110                      int (CDECL *cf)(const void*,const void*) )
 111 {
 112   unsigned int size = *array_size;
 113   if (size)
 114     do
 115     {
 116       if (cf(match, start) == 0)
 117         return start; /* found */
 118       start = (char*)start + elem_size;
 119     } while (--size);
 120
 121   /* not found, add to end */
 122   memcpy(start, match, elem_size);
 123   array_size[0]++;
 124   return start;
 125 }
 126
 127 /*********************************************************************
 128  *                  bsearch_s (msvcrt.@)
 129  */
 130 void* CDECL MSVCRT_bsearch_s(const void *key, const void *base,
 131                              MSVCRT_size_t nmemb, MSVCRT_size_t size,
 132                              int (__cdecl *compare)(void *, const void *, const void *), void *ctx)
 133 {
 134     ssize_t min = 0;
 135     ssize_t max = nmemb - 1;
 136
 137     if (!MSVCRT_CHECK_PMT(size != 0)) return NULL;
 138     if (!MSVCRT_CHECK_PMT(compare != NULL)) return NULL;
 139
 140     while (min <= max)
 141     {
 142         ssize_t cursor = min + (max - min) / 2;
 143         int ret = compare(ctx, key,(const char *)base+(cursor*size));
 144         if (!ret)
 145             return (char*)base+(cursor*size);
 146         if (ret < 0)
 147             max = cursor - 1;
 148         else
 149             min = cursor + 1;
 150     }
 151     return NULL;
 152 }
 153
 154 static int CDECL compare_wrapper(void *ctx, const void *e1, const void *e2)
 155 {
 156     int (__cdecl *compare)(const void *, const void *) = ctx;
 157     return compare(e1, e2);
 158 }
 159
 160 /*********************************************************************
 161  *                  bsearch (msvcrt.@)
 162  */
 163 void* CDECL MSVCRT_bsearch(const void *key, const void *base, MSVCRT_size_t nmemb,
 164         MSVCRT_size_t size, int (__cdecl *compar)(const void *, const void *))
 165 {
 166     return MSVCRT_bsearch_s(key, base, nmemb, size, compare_wrapper, compar);
 167 }
 168 /*********************************************************************
 169  *              _chkesp (MSVCRT.@)
 170  *
 171  * Trap to a debugger if the value of the stack pointer has changed.
 172  *
 173  * PARAMS
 174  *  None.
 175  *
 176  * RETURNS
 177  *  Does not return.
 178  *
 179  * NOTES
 180  *  This function is available for iX86 only.
 181  *
 182  *  When VC++ generates debug code, it stores the value of the stack pointer
 183  *  before calling any external function, and checks the value following
 184  *  the call. It then calls this function, which will trap if the values are
 185  *  not the same. Usually this means that the prototype used to call
 186  *  the function is incorrect.  It can also mean that the .spec entry has
 187  *  the wrong calling convention or parameters.
 188  */
 189 #ifdef __i386__
 190
 191 # ifdef __GNUC__
 192
 193 __ASM_GLOBAL_FUNC(_chkesp,
 194                   "jnz 1f\n\t"
 195                   "ret\n"
 196                   "1:\tpushl %ebp\n\t"
 197                   __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
 198                   __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
 199                   "movl %esp,%ebp\n\t"
 200                   __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
 201                   "subl $12,%esp\n\t"
 202                   "pushl %eax\n\t"
 203                   "pushl %ecx\n\t"
 204                   "pushl %edx\n\t"
 205                   "call " __ASM_NAME("MSVCRT_chkesp_fail") "\n\t"
 206                   "popl %edx\n\t"
 207                   "popl %ecx\n\t"
 208                   "popl %eax\n\t"
 209                   "leave\n\t"
 210                   __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
 211                   __ASM_CFI(".cfi_same_value %ebp\n\t")
 212                   "ret")
 213
 214 void CDECL MSVCRT_chkesp_fail(void)
 215 {
 216   ERR("Stack pointer incorrect after last function call - Bad prototype/spec entry?\n");
 217   DebugBreak();
 218 }
 219
 220 # else  /* __GNUC__ */
 221
 222 /**********************************************************************/
 223
 224 void CDECL _chkesp(void)
 225 {
 226 }
 227
 228 # endif  /* __GNUC__ */
 229
 230 #endif  /* __i386__ */
 231
 232 static inline void swap(char *l, char *r, MSVCRT_size_t size)
 233 {
 234     char tmp;
 235
 236     while(size--) {
 237         tmp = *l;
 238         *l++ = *r;
 239         *r++ = tmp;
 240     }
 241 }
 242
 243 static void small_sort(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
 244         int (CDECL *compar)(void *, const void *, const void *), void *context)
 245 {
 246     MSVCRT_size_t e, i;
 247     char *max, *p;
 248
 249     for(e=nmemb; e>1; e--) {
 250         max = base;
 251         for(i=1; i<e; i++) {
 252             p = (char*)base + i*size;
 253             if(compar(context, p, max) > 0)
 254                 max = p;
 255         }
 256
 257         if(p != max)
 258             swap(p, max, size);
 259     }
 260 }
 261
 262 static void quick_sort(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
 263         int (CDECL *compar)(void *, const void *, const void *), void *context)
 264 {
 265     MSVCRT_size_t stack_lo[8*sizeof(MSVCRT_size_t)], stack_hi[8*sizeof(MSVCRT_size_t)];
 266     MSVCRT_size_t beg, end, lo, hi, med;
 267     int stack_pos;
 268
 269     stack_pos = 0;
 270     stack_lo[stack_pos] = 0;
 271     stack_hi[stack_pos] = nmemb-1;
 272
 273 #define X(i) ((char*)base+size*(i))
 274     while(stack_pos >= 0) {
 275         beg = stack_lo[stack_pos];
 276         end = stack_hi[stack_pos--];
 277
 278         if(end-beg < 8) {
 279             small_sort(X(beg), end-beg+1, size, compar, context);
 280             continue;
 281         }
 282
 283         lo = beg;
 284         hi = end;
 285         med = lo + (hi-lo+1)/2;
 286         if(compar(context, X(lo), X(med)) > 0)
 287             swap(X(lo), X(med), size);
 288         if(compar(context, X(lo), X(hi)) > 0)
 289             swap(X(lo), X(hi), size);
 290         if(compar(context, X(med), X(hi)) > 0)
 291             swap(X(med), X(hi), size);
 292
 293         lo++;
 294         hi--;
 295         while(1) {
 296             while(lo <= hi) {
 297                 if(lo!=med && compar(context, X(lo), X(med))>0)
 298                     break;
 299                 lo++;
 300             }
 301
 302             while(med != hi) {
 303                 if(compar(context, X(hi), X(med)) <= 0)
 304                     break;
 305                 hi--;
 306             }
 307
 308             if(hi < lo)
 309                 break;
 310
 311             swap(X(lo), X(hi), size);
 312             if(hi == med)
 313                 med = lo;
 314             lo++;
 315             hi--;
 316         }
 317
 318         while(hi > beg) {
 319             if(hi!=med && compar(context, X(hi), X(med))!=0)
 320                 break;
 321             hi--;
 322         }
 323
 324         if(hi-beg >= end-lo) {
 325             stack_lo[++stack_pos] = beg;
 326             stack_hi[stack_pos] = hi;
 327             stack_lo[++stack_pos] = lo;
 328             stack_hi[stack_pos] = end;
 329         }else {
 330             stack_lo[++stack_pos] = lo;
 331             stack_hi[stack_pos] = end;
 332             stack_lo[++stack_pos] = beg;
 333             stack_hi[stack_pos] = hi;
 334         }
 335     }
 336 #undef X
 337 }
 338
 339 /*********************************************************************
 340  * qsort_s (MSVCRT.@)
 341  *
 342  * This function is trying to sort data doing identical comparisons
 343  * as native does. There are still cases where it behaves differently.
 344  */
 345 void CDECL MSVCRT_qsort_s(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
 346     int (CDECL *compar)(void *, const void *, const void *), void *context)
 347 {
 348     const MSVCRT_size_t total_size = nmemb*size;
 349
 350     if (!MSVCRT_CHECK_PMT(base != NULL || (base == NULL && nmemb == 0))) return;
 351     if (!MSVCRT_CHECK_PMT(size > 0)) return;
 352     if (!MSVCRT_CHECK_PMT(compar != NULL)) return;
 353     if (total_size / size != nmemb) return;
 354
 355     if (nmemb < 2) return;
 356
 357     quick_sort(base, nmemb, size, compar, context);
 358 }
 359
 360 /*********************************************************************
 361  * qsort (MSVCRT.@)
 362  */
 363 void CDECL MSVCRT_qsort(void *base, MSVCRT_size_t nmemb, MSVCRT_size_t size,
 364         int (CDECL *compar)(const void*, const void*))
 365 {
 366     MSVCRT_qsort_s(base, nmemb, size, compare_wrapper, compar);
 367 }
 368
 369 /*********************************************************************
 370  * _get_output_format (MSVCRT.@)
 371  */
 372 unsigned int CDECL MSVCRT__get_output_format(void)
 373 {
 374    return output_format;
 375 }
 376
 377 /*********************************************************************
 378  * _set_output_format (MSVCRT.@)
 379  */
 380 unsigned int CDECL _set_output_format(unsigned int new_output_format)
 381 {
 382     unsigned int ret = output_format;
 383
 384     if(!MSVCRT_CHECK_PMT(new_output_format==0 || new_output_format==MSVCRT__TWO_DIGIT_EXPONENT))
 385         return ret;
 386
 387     output_format = new_output_format;
 388     return ret;
 389 }
 390
 391 /*********************************************************************
 392  * _resetstkoflw (MSVCRT.@)
 393  */
 394 int CDECL MSVCRT__resetstkoflw(void)
 395 {
 396     int stack_addr;
 397     DWORD oldprot;
 398
 399     /* causes stack fault that updates NtCurrentTeb()->Tib.StackLimit */
 400     return VirtualProtect(&stack_addr, 1, PAGE_GUARD|PAGE_READWRITE, &oldprot);
 401 }
 402
 403 /*********************************************************************
 404  *  _decode_pointer (MSVCR90.@)
 405  */
 406 void * CDECL MSVCRT_decode_pointer(void * ptr)
 407 {
 408     return DecodePointer(ptr);
 409 }
 410
 411 /*********************************************************************
 412  *  _encode_pointer (MSVCR90.@)
 413  */
 414 void * CDECL MSVCRT_encode_pointer(void * ptr)
 415 {
 416     return EncodePointer(ptr);
 417 }
 418
 419 /*********************************************************************
 420  *  _encoded_null (MSVCR100.@)
 421  */
 422 void * CDECL _encoded_null(void)
 423 {
 424     TRACE("\n");
 425
 426     return EncodePointer(NULL);
 427 }
 428
 429 /*********************************************************************
 430  * _CRT_RTC_INIT (MSVCR100.@)
 431  */
 432 void* CDECL _CRT_RTC_INIT(void *unk1, void *unk2, int unk3, int unk4, int unk5)
 433 {
 434     TRACE("%p %p %x %x %x\n", unk1, unk2, unk3, unk4, unk5);
 435     return NULL;
 436 }
 437
 438 /*********************************************************************
 439  * _CRT_RTC_INITW (MSVCR100.@)
 440  */
 441 void* CDECL _CRT_RTC_INITW(void *unk1, void *unk2, int unk3, int unk4, int unk5)
 442 {
 443     TRACE("%p %p %x %x %x\n", unk1, unk2, unk3, unk4, unk5);
 444     return NULL;
 445 }
 446
 447 /*********************************************************************
 448  * _byteswap_ushort (MSVCR100.@)
 449  */
 450 unsigned short CDECL _byteswap_ushort(unsigned short s)
 451 {
 452     return (s<<8) + (s>>8);
 453 }
 454
 455 /*********************************************************************
 456  * _byteswap_ulong (MSVCR100.@)
 457  */
 458 ULONG CDECL MSVCRT__byteswap_ulong(ULONG l)
 459 {
 460     return (l<<24) + ((l<<8)&0xFF0000) + ((l>>8)&0xFF00) + (l>>24);
 461 }
 462
 463 /*********************************************************************
 464  * _byteswap_uint64 (MSVCR100.@)
 465  */
 466 unsigned __int64 CDECL _byteswap_uint64(unsigned __int64 i)
 467 {
 468     return (i<<56) + ((i&0xFF00)<<40) + ((i&0xFF0000)<<24) + ((i&0xFF000000)<<8) +
 469         ((i>>8)&0xFF000000) + ((i>>24)&0xFF0000) + ((i>>40)&0xFF00) + (i>>56);
 470 }
 471
 472 /*********************************************************************
 473  *  __crtGetShowWindowMode (MSVCR110.@)
 474  */
 475 int CDECL MSVCR110__crtGetShowWindowMode(void)
 476 {
 477     STARTUPINFOW si;
 478
 479     GetStartupInfoW(&si);
 480     TRACE("window=%d\n", si.wShowWindow);
 481     return si.wShowWindow;
 482 }
 483
 484 /*********************************************************************
 485  *  __crtInitializeCriticalSectionEx (MSVCR110.@)
 486  */
 487 BOOL CDECL MSVCR110__crtInitializeCriticalSectionEx(
 488         CRITICAL_SECTION *cs, DWORD spin_count, DWORD flags)
 489 {
 490     TRACE("(%p %x %x)\n", cs, spin_count, flags);
 491     return InitializeCriticalSectionEx(cs, spin_count, flags);
 492 }