dlls/msvcrt/math.c

   1 /*
   2  * msvcrt.dll math 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 #include "config.h"
  21
  22 #include <stdio.h>
  23 #define __USE_ISOC9X 1
  24 #define __USE_ISOC99 1
  25 #include <math.h>
  26 #ifdef HAVE_IEEEFP_H
  27 #include <ieeefp.h>
  28 #endif
  29
  30 #include "msvcrt.h"
  31
  32 #include "wine/debug.h"
  33
  34 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
  35
  36 #ifndef HAVE_FINITE
  37 #ifndef finite /* Could be a macro */
  38 #ifdef isfinite
  39 #define finite(x) isfinite(x)
  40 #else
  41 #define finite(x) (!isnan(x)) /* At least catch some cases */
  42 #endif
  43 #endif
  44 #endif
  45
  46 #ifndef signbit
  47 #define signbit(x) 0
  48 #endif
  49
  50 typedef int (*MSVCRT_matherr_func)(struct MSVCRT__exception *);
  51
  52 static MSVCRT_matherr_func MSVCRT_default_matherr_func = NULL;
  53
  54 /*********************************************************************
  55  *              MSVCRT_acos (MSVCRT.@)
  56  */
  57 double CDECL MSVCRT_acos( double x )
  58 {
  59   if (x < -1.0 || x > 1.0 || !finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
  60   /* glibc implements acos() as the FPU equivalent of atan2(sqrt(1 - x ^ 2), x).
  61    * asin() uses a similar construction. This is bad because as x gets nearer to
  62    * 1 the error in the expression "1 - x^2" can get relatively large due to
  63    * cancellation. The sqrt() makes things worse. A safer way to calculate
  64    * acos() is to use atan2(sqrt((1 - x) * (1 + x)), x). */
  65   return atan2(sqrt((1 - x) * (1 + x)), x);
  66 }
  67
  68 /*********************************************************************
  69  *              MSVCRT_asin (MSVCRT.@)
  70  */
  71 double CDECL MSVCRT_asin( double x )
  72 {
  73   if (x < -1.0 || x > 1.0 || !finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
  74   return atan2(x, sqrt((1 - x) * (1 + x)));
  75 }
  76
  77 /*********************************************************************
  78  *              MSVCRT_atan (MSVCRT.@)
  79  */
  80 double CDECL MSVCRT_atan( double x )
  81 {
  82   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
  83   return atan(x);
  84 }
  85
  86 /*********************************************************************
  87  *              MSVCRT_atan2 (MSVCRT.@)
  88  */
  89 double CDECL MSVCRT_atan2( double x, double y )
  90 {
  91   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
  92   return atan2(x,y);
  93 }
  94
  95 /*********************************************************************
  96  *              MSVCRT_cos (MSVCRT.@)
  97  */
  98 double CDECL MSVCRT_cos( double x )
  99 {
 100   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 101   return cos(x);
 102 }
 103
 104 /*********************************************************************
 105  *              MSVCRT_cosh (MSVCRT.@)
 106  */
 107 double CDECL MSVCRT_cosh( double x )
 108 {
 109   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 110   return cosh(x);
 111 }
 112
 113 /*********************************************************************
 114  *              MSVCRT_exp (MSVCRT.@)
 115  */
 116 double CDECL MSVCRT_exp( double x )
 117 {
 118   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 119   return exp(x);
 120 }
 121
 122 /*********************************************************************
 123  *              MSVCRT_fmod (MSVCRT.@)
 124  */
 125 double CDECL MSVCRT_fmod( double x, double y )
 126 {
 127   if (!finite(x) || !finite(y)) *MSVCRT__errno() = MSVCRT_EDOM;
 128   return fmod(x,y);
 129 }
 130
 131 /*********************************************************************
 132  *              MSVCRT_log (MSVCRT.@)
 133  */
 134 double CDECL MSVCRT_log( double x)
 135 {
 136   if (x < 0.0 || !finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 137   if (x == 0.0) *MSVCRT__errno() = MSVCRT_ERANGE;
 138   return log(x);
 139 }
 140
 141 /*********************************************************************
 142  *              MSVCRT_log10 (MSVCRT.@)
 143  */
 144 double CDECL MSVCRT_log10( double x )
 145 {
 146   if (x < 0.0 || !finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 147   if (x == 0.0) *MSVCRT__errno() = MSVCRT_ERANGE;
 148   return log10(x);
 149 }
 150
 151 /*********************************************************************
 152  *              MSVCRT_pow (MSVCRT.@)
 153  */
 154 double CDECL MSVCRT_pow( double x, double y )
 155 {
 156   /* FIXME: If x < 0 and y is not integral, set EDOM */
 157   double z = pow(x,y);
 158   if (!finite(z)) *MSVCRT__errno() = MSVCRT_EDOM;
 159   return z;
 160 }
 161
 162 /*********************************************************************
 163  *              MSVCRT_sin (MSVCRT.@)
 164  */
 165 double CDECL MSVCRT_sin( double x )
 166 {
 167   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 168   return sin(x);
 169 }
 170
 171 /*********************************************************************
 172  *              MSVCRT_sinh (MSVCRT.@)
 173  */
 174 double CDECL MSVCRT_sinh( double x )
 175 {
 176   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 177   return sinh(x);
 178 }
 179
 180 /*********************************************************************
 181  *              MSVCRT_sqrt (MSVCRT.@)
 182  */
 183 double CDECL MSVCRT_sqrt( double x )
 184 {
 185   if (x < 0.0 || !finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 186   return sqrt(x);
 187 }
 188
 189 /*********************************************************************
 190  *              MSVCRT_tan (MSVCRT.@)
 191  */
 192 double CDECL MSVCRT_tan( double x )
 193 {
 194   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 195   return tan(x);
 196 }
 197
 198 /*********************************************************************
 199  *              MSVCRT_tanh (MSVCRT.@)
 200  */
 201 double CDECL MSVCRT_tanh( double x )
 202 {
 203   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 204   return tanh(x);
 205 }
 206
 207
 208 #if defined(__GNUC__) && defined(__i386__)
 209
 210 #define FPU_DOUBLE(var) double var; \
 211   __asm__ __volatile__( "fstpl %0;fwait" : "=m" (var) : )
 212 #define FPU_DOUBLES(var1,var2) double var1,var2; \
 213   __asm__ __volatile__( "fstpl %0;fwait" : "=m" (var2) : ); \
 214   __asm__ __volatile__( "fstpl %0;fwait" : "=m" (var1) : )
 215
 216 /*********************************************************************
 217  *              _CIacos (MSVCRT.@)
 218  */
 219 double CDECL _CIacos(void)
 220 {
 221   FPU_DOUBLE(x);
 222   return MSVCRT_acos(x);
 223 }
 224
 225 /*********************************************************************
 226  *              _CIasin (MSVCRT.@)
 227  */
 228 double CDECL _CIasin(void)
 229 {
 230   FPU_DOUBLE(x);
 231   return MSVCRT_asin(x);
 232 }
 233
 234 /*********************************************************************
 235  *              _CIatan (MSVCRT.@)
 236  */
 237 double CDECL _CIatan(void)
 238 {
 239   FPU_DOUBLE(x);
 240   return MSVCRT_atan(x);
 241 }
 242
 243 /*********************************************************************
 244  *              _CIatan2 (MSVCRT.@)
 245  */
 246 double CDECL _CIatan2(void)
 247 {
 248   FPU_DOUBLES(x,y);
 249   return MSVCRT_atan2(x,y);
 250 }
 251
 252 /*********************************************************************
 253  *              _CIcos (MSVCRT.@)
 254  */
 255 double CDECL _CIcos(void)
 256 {
 257   FPU_DOUBLE(x);
 258   return MSVCRT_cos(x);
 259 }
 260
 261 /*********************************************************************
 262  *              _CIcosh (MSVCRT.@)
 263  */
 264 double CDECL _CIcosh(void)
 265 {
 266   FPU_DOUBLE(x);
 267   return MSVCRT_cosh(x);
 268 }
 269
 270 /*********************************************************************
 271  *              _CIexp (MSVCRT.@)
 272  */
 273 double CDECL _CIexp(void)
 274 {
 275   FPU_DOUBLE(x);
 276   return MSVCRT_exp(x);
 277 }
 278
 279 /*********************************************************************
 280  *              _CIfmod (MSVCRT.@)
 281  */
 282 double CDECL _CIfmod(void)
 283 {
 284   FPU_DOUBLES(x,y);
 285   return MSVCRT_fmod(x,y);
 286 }
 287
 288 /*********************************************************************
 289  *              _CIlog (MSVCRT.@)
 290  */
 291 double CDECL _CIlog(void)
 292 {
 293   FPU_DOUBLE(x);
 294   return MSVCRT_log(x);
 295 }
 296
 297 /*********************************************************************
 298  *              _CIlog10 (MSVCRT.@)
 299  */
 300 double CDECL _CIlog10(void)
 301 {
 302   FPU_DOUBLE(x);
 303   return MSVCRT_log10(x);
 304 }
 305
 306 /*********************************************************************
 307  *              _CIpow (MSVCRT.@)
 308  */
 309 double CDECL _CIpow(void)
 310 {
 311   FPU_DOUBLES(x,y);
 312   return MSVCRT_pow(x,y);
 313 }
 314
 315 /*********************************************************************
 316  *              _CIsin (MSVCRT.@)
 317  */
 318 double CDECL _CIsin(void)
 319 {
 320   FPU_DOUBLE(x);
 321   return MSVCRT_sin(x);
 322 }
 323
 324 /*********************************************************************
 325  *              _CIsinh (MSVCRT.@)
 326  */
 327 double CDECL _CIsinh(void)
 328 {
 329   FPU_DOUBLE(x);
 330   return MSVCRT_sinh(x);
 331 }
 332
 333 /*********************************************************************
 334  *              _CIsqrt (MSVCRT.@)
 335  */
 336 double CDECL _CIsqrt(void)
 337 {
 338   FPU_DOUBLE(x);
 339   return MSVCRT_sqrt(x);
 340 }
 341
 342 /*********************************************************************
 343  *              _CItan (MSVCRT.@)
 344  */
 345 double CDECL _CItan(void)
 346 {
 347   FPU_DOUBLE(x);
 348   return MSVCRT_tan(x);
 349 }
 350
 351 /*********************************************************************
 352  *              _CItanh (MSVCRT.@)
 353  */
 354 double CDECL _CItanh(void)
 355 {
 356   FPU_DOUBLE(x);
 357   return MSVCRT_tanh(x);
 358 }
 359
 360 #endif /* defined(__GNUC__) && defined(__i386__) */
 361
 362 /*********************************************************************
 363  *              _fpclass (MSVCRT.@)
 364  */
 365 int CDECL _fpclass(double num)
 366 {
 367 #if defined(HAVE_FPCLASS) || defined(fpclass)
 368   switch (fpclass( num ))
 369   {
 370 #ifdef FP_SNAN
 371   case FP_SNAN:  return MSVCRT__FPCLASS_SNAN;
 372 #endif
 373 #ifdef FP_QNAN
 374   case FP_QNAN:  return MSVCRT__FPCLASS_QNAN;
 375 #endif
 376 #ifdef FP_NINF
 377   case FP_NINF:  return MSVCRT__FPCLASS_NINF;
 378 #endif
 379 #ifdef FP_PINF
 380   case FP_PINF:  return MSVCRT__FPCLASS_PINF;
 381 #endif
 382 #ifdef FP_NDENORM
 383   case FP_NDENORM: return MSVCRT__FPCLASS_ND;
 384 #endif
 385 #ifdef FP_PDENORM
 386   case FP_PDENORM: return MSVCRT__FPCLASS_PD;
 387 #endif
 388 #ifdef FP_NZERO
 389   case FP_NZERO: return MSVCRT__FPCLASS_NZ;
 390 #endif
 391 #ifdef FP_PZERO
 392   case FP_PZERO: return MSVCRT__FPCLASS_PZ;
 393 #endif
 394 #ifdef FP_NNORM
 395   case FP_NNORM: return MSVCRT__FPCLASS_NN;
 396 #endif
 397 #ifdef FP_PNORM
 398   case FP_PNORM: return MSVCRT__FPCLASS_PN;
 399 #endif
 400   default: return MSVCRT__FPCLASS_PN;
 401   }
 402 #elif defined (fpclassify)
 403   switch (fpclassify( num ))
 404   {
 405   case FP_NAN: return MSVCRT__FPCLASS_QNAN;
 406   case FP_INFINITE: return signbit(num) ? MSVCRT__FPCLASS_NINF : MSVCRT__FPCLASS_PINF;
 407   case FP_SUBNORMAL: return signbit(num) ?MSVCRT__FPCLASS_ND : MSVCRT__FPCLASS_PD;
 408   case FP_ZERO: return signbit(num) ? MSVCRT__FPCLASS_NZ : MSVCRT__FPCLASS_PZ;
 409   }
 410   return signbit(num) ? MSVCRT__FPCLASS_NN : MSVCRT__FPCLASS_PN;
 411 #else
 412   if (!finite(num))
 413     return MSVCRT__FPCLASS_QNAN;
 414   return num == 0.0 ? MSVCRT__FPCLASS_PZ : (num < 0 ? MSVCRT__FPCLASS_NN : MSVCRT__FPCLASS_PN);
 415 #endif
 416 }
 417
 418 /*********************************************************************
 419  *              _rotl (MSVCRT.@)
 420  */
 421 unsigned int CDECL _rotl(unsigned int num, int shift)
 422 {
 423   shift &= 31;
 424   return (num << shift) | (num >> (32-shift));
 425 }
 426
 427 /*********************************************************************
 428  *              _logb (MSVCRT.@)
 429  */
 430 double CDECL _logb(double num)
 431 {
 432   if (!finite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
 433   return logb(num);
 434 }
 435
 436 /*********************************************************************
 437  *              _lrotl (MSVCRT.@)
 438  */
 439 MSVCRT_ulong CDECL _lrotl(MSVCRT_ulong num, int shift)
 440 {
 441   shift &= 0x1f;
 442   return (num << shift) | (num >> (32-shift));
 443 }
 444
 445 /*********************************************************************
 446  *              _lrotr (MSVCRT.@)
 447  */
 448 MSVCRT_ulong CDECL _lrotr(MSVCRT_ulong num, int shift)
 449 {
 450   shift &= 0x1f;
 451   return (num >> shift) | (num << (32-shift));
 452 }
 453
 454 /*********************************************************************
 455  *              _rotr (MSVCRT.@)
 456  */
 457 unsigned int CDECL _rotr(unsigned int num, int shift)
 458 {
 459     shift &= 0x1f;
 460     return (num >> shift) | (num << (32-shift));
 461 }
 462
 463 /*********************************************************************
 464  *              _scalb (MSVCRT.@)
 465  */
 466 double CDECL _scalb(double num, MSVCRT_long power)
 467 {
 468   /* Note - Can't forward directly as libc expects y as double */
 469   double dblpower = (double)power;
 470   if (!finite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
 471   return scalb(num, dblpower);
 472 }
 473
 474 /*********************************************************************
 475  *              _hypot (MSVCRT.@)
 476  */
 477 double CDECL _hypot(double x, double y)
 478 {
 479   /* FIXME: errno handling */
 480   return hypot( x, y );
 481 }
 482
 483 /*********************************************************************
 484  *              ceil (MSVCRT.@)
 485  */
 486 double CDECL MSVCRT_ceil( double x )
 487 {
 488   return ceil(x);
 489 }
 490
 491 /*********************************************************************
 492  *              floor (MSVCRT.@)
 493  */
 494 double CDECL MSVCRT_floor( double x )
 495 {
 496   return floor(x);
 497 }
 498
 499 /*********************************************************************
 500  *              fabs (MSVCRT.@)
 501  */
 502 double CDECL MSVCRT_fabs( double x )
 503 {
 504   return fabs(x);
 505 }
 506
 507 /*********************************************************************
 508  *              frexp (MSVCRT.@)
 509  */
 510 double CDECL MSVCRT_frexp( double x, int *exp )
 511 {
 512   return frexp( x, exp );
 513 }
 514
 515 /*********************************************************************
 516  *              modf (MSVCRT.@)
 517  */
 518 double CDECL MSVCRT_modf( double x, double *iptr )
 519 {
 520   return modf( x, iptr );
 521 }
 522
 523 /*********************************************************************
 524  *              _matherr (MSVCRT.@)
 525  */
 526 int CDECL MSVCRT__matherr(struct MSVCRT__exception *e)
 527 {
 528   if (e)
 529     TRACE("(%p = %d, %s, %g %g %g)\n",e, e->type, e->name, e->arg1, e->arg2,
 530           e->retval);
 531   else
 532     TRACE("(null)\n");
 533   if (MSVCRT_default_matherr_func)
 534     return MSVCRT_default_matherr_func(e);
 535   ERR(":Unhandled math error!\n");
 536   return 0;
 537 }
 538
 539 /*********************************************************************
 540  *              __setusermatherr (MSVCRT.@)
 541  */
 542 void CDECL MSVCRT___setusermatherr(MSVCRT_matherr_func func)
 543 {
 544   MSVCRT_default_matherr_func = func;
 545   TRACE(":new matherr handler %p\n", func);
 546 }
 547
 548 /**********************************************************************
 549  *              _statusfp (MSVCRT.@)
 550  */
 551 unsigned int CDECL _statusfp(void)
 552 {
 553    unsigned int retVal = 0;
 554 #if defined(__GNUC__) && defined(__i386__)
 555   unsigned int fpword;
 556
 557   __asm__ __volatile__( "fstsw %0" : "=m" (fpword) : );
 558   if (fpword & 0x1)  retVal |= MSVCRT__SW_INVALID;
 559   if (fpword & 0x2)  retVal |= MSVCRT__SW_DENORMAL;
 560   if (fpword & 0x4)  retVal |= MSVCRT__SW_ZERODIVIDE;
 561   if (fpword & 0x8)  retVal |= MSVCRT__SW_OVERFLOW;
 562   if (fpword & 0x10) retVal |= MSVCRT__SW_UNDERFLOW;
 563   if (fpword & 0x20) retVal |= MSVCRT__SW_INEXACT;
 564 #else
 565   FIXME(":Not implemented!\n");
 566 #endif
 567   return retVal;
 568 }
 569
 570 /*********************************************************************
 571  *              _clearfp (MSVCRT.@)
 572  */
 573 unsigned int CDECL _clearfp(void)
 574 {
 575   unsigned int retVal = _statusfp();
 576 #if defined(__GNUC__) && defined(__i386__)
 577   __asm__ __volatile__( "fnclex" );
 578 #else
 579   FIXME(":Not Implemented\n");
 580 #endif
 581   return retVal;
 582 }
 583
 584 /*********************************************************************
 585  *              __fpecode (MSVCRT.@)
 586  */
 587 int * CDECL __fpecode(void)
 588 {
 589     return &msvcrt_get_thread_data()->fpecode;
 590 }
 591
 592 /*********************************************************************
 593  *              ldexp (MSVCRT.@)
 594  */
 595 double CDECL MSVCRT_ldexp(double num, MSVCRT_long exp)
 596 {
 597   double z = ldexp(num,exp);
 598
 599   if (!finite(z))
 600     *MSVCRT__errno() = MSVCRT_ERANGE;
 601   else if (z == 0 && signbit(z))
 602     z = 0.0; /* Convert -0 -> +0 */
 603   return z;
 604 }
 605
 606 /*********************************************************************
 607  *              _cabs (MSVCRT.@)
 608  */
 609 double CDECL MSVCRT__cabs(struct MSVCRT__complex num)
 610 {
 611   return sqrt(num.x * num.x + num.y * num.y);
 612 }
 613
 614 /*********************************************************************
 615  *              _chgsign (MSVCRT.@)
 616  */
 617 double CDECL _chgsign(double num)
 618 {
 619   /* FIXME: +-infinity,Nan not tested */
 620   return -num;
 621 }
 622
 623 /*********************************************************************
 624  *              _control87 (MSVCRT.@)
 625  */
 626 unsigned int CDECL _control87(unsigned int newval, unsigned int mask)
 627 {
 628 #if defined(__GNUC__) && defined(__i386__)
 629   unsigned int fpword = 0;
 630   unsigned int flags = 0;
 631
 632   TRACE("(%08x, %08x): Called\n", newval, mask);
 633
 634   /* Get fp control word */
 635   __asm__ __volatile__( "fstcw %0" : "=m" (fpword) : );
 636
 637   TRACE("Control word before : %08x\n", fpword);
 638
 639   /* Convert into mask constants */
 640   if (fpword & 0x1)  flags |= MSVCRT__EM_INVALID;
 641   if (fpword & 0x2)  flags |= MSVCRT__EM_DENORMAL;
 642   if (fpword & 0x4)  flags |= MSVCRT__EM_ZERODIVIDE;
 643   if (fpword & 0x8)  flags |= MSVCRT__EM_OVERFLOW;
 644   if (fpword & 0x10) flags |= MSVCRT__EM_UNDERFLOW;
 645   if (fpword & 0x20) flags |= MSVCRT__EM_INEXACT;
 646   switch(fpword & 0xC00) {
 647   case 0xC00: flags |= MSVCRT__RC_UP|MSVCRT__RC_DOWN; break;
 648   case 0x800: flags |= MSVCRT__RC_UP; break;
 649   case 0x400: flags |= MSVCRT__RC_DOWN; break;
 650   }
 651   switch(fpword & 0x300) {
 652   case 0x0:   flags |= MSVCRT__PC_24; break;
 653   case 0x200: flags |= MSVCRT__PC_53; break;
 654   case 0x300: flags |= MSVCRT__PC_64; break;
 655   }
 656   if (fpword & 0x1000) flags |= MSVCRT__IC_AFFINE;
 657
 658   /* Mask with parameters */
 659   flags = (flags & ~mask) | (newval & mask);
 660
 661   /* Convert (masked) value back to fp word */
 662   fpword = 0;
 663   if (flags & MSVCRT__EM_INVALID)    fpword |= 0x1;
 664   if (flags & MSVCRT__EM_DENORMAL)   fpword |= 0x2;
 665   if (flags & MSVCRT__EM_ZERODIVIDE) fpword |= 0x4;
 666   if (flags & MSVCRT__EM_OVERFLOW)   fpword |= 0x8;
 667   if (flags & MSVCRT__EM_UNDERFLOW)  fpword |= 0x10;
 668   if (flags & MSVCRT__EM_INEXACT)    fpword |= 0x20;
 669   switch(flags & (MSVCRT__RC_UP | MSVCRT__RC_DOWN)) {
 670   case MSVCRT__RC_UP|MSVCRT__RC_DOWN: fpword |= 0xC00; break;
 671   case MSVCRT__RC_UP:          fpword |= 0x800; break;
 672   case MSVCRT__RC_DOWN:        fpword |= 0x400; break;
 673   }
 674   switch (flags & (MSVCRT__PC_24 | MSVCRT__PC_53)) {
 675   case MSVCRT__PC_64: fpword |= 0x300; break;
 676   case MSVCRT__PC_53: fpword |= 0x200; break;
 677   case MSVCRT__PC_24: fpword |= 0x0; break;
 678   }
 679   if (flags & MSVCRT__IC_AFFINE) fpword |= 0x1000;
 680
 681   TRACE("Control word after  : %08x\n", fpword);
 682
 683   /* Put fp control word */
 684   __asm__ __volatile__( "fldcw %0" : : "m" (fpword) );
 685
 686   return flags;
 687 #else
 688   FIXME(":Not Implemented!\n");
 689   return 0;
 690 #endif
 691 }
 692
 693 /*********************************************************************
 694  *              _controlfp (MSVCRT.@)
 695  */
 696 unsigned int CDECL _controlfp(unsigned int newval, unsigned int mask)
 697 {
 698 #ifdef __i386__
 699   return _control87( newval, mask & ~MSVCRT__EM_DENORMAL );
 700 #else
 701   FIXME(":Not Implemented!\n");
 702   return 0;
 703 #endif
 704 }
 705
 706 /*********************************************************************
 707  *              _copysign (MSVCRT.@)
 708  */
 709 double CDECL _copysign(double num, double sign)
 710 {
 711   /* FIXME: Behaviour for Nan/Inf? */
 712   if (sign < 0.0)
 713     return num < 0.0 ? num : -num;
 714   return num < 0.0 ? -num : num;
 715 }
 716
 717 /*********************************************************************
 718  *              _finite (MSVCRT.@)
 719  */
 720 int CDECL _finite(double num)
 721 {
 722   return (finite(num)?1:0); /* See comment for _isnan() */
 723 }
 724
 725 /*********************************************************************
 726  *              _fpreset (MSVCRT.@)
 727  */
 728 void CDECL _fpreset(void)
 729 {
 730 #if defined(__GNUC__) && defined(__i386__)
 731   __asm__ __volatile__( "fninit" );
 732 #else
 733   FIXME(":Not Implemented!\n");
 734 #endif
 735 }
 736
 737 /*********************************************************************
 738  *              _isnan (MSVCRT.@)
 739  */
 740 INT CDECL _isnan(double num)
 741 {
 742   /* Some implementations return -1 for true(glibc), msvcrt/crtdll return 1.
 743    * Do the same, as the result may be used in calculations
 744    */
 745   return isnan(num) ? 1 : 0;
 746 }
 747
 748 /*********************************************************************
 749  *              _j0 (MSVCRT.@)
 750  */
 751 double CDECL _j0(double num)
 752 {
 753   /* FIXME: errno handling */
 754   return j0(num);
 755 }
 756
 757 /*********************************************************************
 758  *              _j1 (MSVCRT.@)
 759  */
 760 double CDECL _j1(double num)
 761 {
 762   /* FIXME: errno handling */
 763   return j1(num);
 764 }
 765
 766 /*********************************************************************
 767  *              jn (MSVCRT.@)
 768  */
 769 double CDECL _jn(int n, double num)
 770 {
 771   /* FIXME: errno handling */
 772   return jn(n, num);
 773 }
 774
 775 /*********************************************************************
 776  *              _y0 (MSVCRT.@)
 777  */
 778 double CDECL _y0(double num)
 779 {
 780   double retval;
 781   if (!finite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
 782   retval  = y0(num);
 783   if (_fpclass(retval) == MSVCRT__FPCLASS_NINF)
 784   {
 785     *MSVCRT__errno() = MSVCRT_EDOM;
 786     retval = sqrt(-1);
 787   }
 788   return retval;
 789 }
 790
 791 /*********************************************************************
 792  *              _y1 (MSVCRT.@)
 793  */
 794 double CDECL _y1(double num)
 795 {
 796   double retval;
 797   if (!finite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
 798   retval  = y1(num);
 799   if (_fpclass(retval) == MSVCRT__FPCLASS_NINF)
 800   {
 801     *MSVCRT__errno() = MSVCRT_EDOM;
 802     retval = sqrt(-1);
 803   }
 804   return retval;
 805 }
 806
 807 /*********************************************************************
 808  *              _yn (MSVCRT.@)
 809  */
 810 double CDECL _yn(int order, double num)
 811 {
 812   double retval;
 813   if (!finite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
 814   retval  = yn(order,num);
 815   if (_fpclass(retval) == MSVCRT__FPCLASS_NINF)
 816   {
 817     *MSVCRT__errno() = MSVCRT_EDOM;
 818     retval = sqrt(-1);
 819   }
 820   return retval;
 821 }
 822
 823 /*********************************************************************
 824  *              _nextafter (MSVCRT.@)
 825  */
 826 double CDECL _nextafter(double num, double next)
 827 {
 828   double retval;
 829   if (!finite(num) || !finite(next)) *MSVCRT__errno() = MSVCRT_EDOM;
 830   retval = nextafter(num,next);
 831   return retval;
 832 }
 833
 834 /*********************************************************************
 835  *              _ecvt (MSVCRT.@)
 836  */
 837 char * CDECL _ecvt( double number, int ndigits, int *decpt, int *sign )
 838 {
 839     int prec, len;
 840     thread_data_t *data = msvcrt_get_thread_data();
 841     /* FIXME: check better for overflow (native supports over 300 chars's) */
 842     ndigits = min( ndigits, 80 - 7); /* 7 : space for dec point, 1 for "e",
 843                                       * 4 for exponent and one for
 844                                       * terminating '\0' */
 845     if (!data->efcvt_buffer)
 846         data->efcvt_buffer = MSVCRT_malloc( 80 ); /* ought to be enough */
 847
 848     if( number < 0) {
 849         *sign = TRUE;
 850         number = -number;
 851     } else
 852         *sign = FALSE;
 853     /* handle cases with zero ndigits or less */
 854     prec = ndigits;
 855     if( prec < 1) prec = 2;
 856     len = snprintf(data->efcvt_buffer, 80, "%.*le", prec - 1, number);
 857     /* take the decimal "point away */
 858     if( prec != 1)
 859         memmove( data->efcvt_buffer + 1, data->efcvt_buffer + 2, len - 1 );
 860     /* take the exponential "e" out */
 861     data->efcvt_buffer[ prec] = '\0';
 862     /* read the exponent */
 863     sscanf( data->efcvt_buffer + prec + 1, "%d", decpt);
 864     (*decpt)++;
 865     /* adjust for some border cases */
 866     if( data->efcvt_buffer[0] == '0')/* value is zero */
 867         *decpt = 0;
 868     /* handle cases with zero ndigits or less */
 869     if( ndigits < 1){
 870         if( data->efcvt_buffer[ 0] >= '5')
 871             (*decpt)++;
 872         data->efcvt_buffer[ 0] = '\0';
 873     }
 874     TRACE("out=\"%s\"\n",data->efcvt_buffer);
 875     return data->efcvt_buffer;
 876 }
 877
 878 /***********************************************************************
 879  *              _fcvt  (MSVCRT.@)
 880  */
 881 char * CDECL _fcvt( double number, int ndigits, int *decpt, int *sign )
 882 {
 883     thread_data_t *data = msvcrt_get_thread_data();
 884     int stop, dec1, dec2;
 885     char *ptr1, *ptr2, *first;
 886     char buf[80]; /* ought to be enough */
 887
 888     if (!data->efcvt_buffer)
 889         data->efcvt_buffer = MSVCRT_malloc( 80 ); /* ought to be enough */
 890
 891     if (number < 0)
 892     {
 893         *sign = 1;
 894         number = -number;
 895     } else *sign = 0;
 896
 897     snprintf(buf, 80, "%.*f", ndigits < 0 ? 0 : ndigits, number);
 898     ptr1 = buf;
 899     ptr2 = data->efcvt_buffer;
 900     first = NULL;
 901     dec1 = 0;
 902     dec2 = 0;
 903
 904     /* For numbers below the requested resolution, work out where
 905        the decimal point will be rather than finding it in the string */
 906     if (number < 1.0 && number > 0.0) {
 907         dec2 = log10(number + 1e-10);
 908         if (-dec2 <= ndigits) dec2 = 0;
 909     }
 910
 911     /* If requested digits is zero or less, we will need to truncate
 912      * the returned string */
 913     if (ndigits < 1) {
 914         stop = strlen(buf) + ndigits;
 915     } else {
 916         stop = strlen(buf);
 917     }
 918
 919     while (*ptr1 == '0') ptr1++; /* Skip leading zeroes */
 920     while (*ptr1 != '\0' && *ptr1 != '.') {
 921         if (!first) first = ptr2;
 922         if ((ptr1 - buf) < stop) {
 923             *ptr2++ = *ptr1++;
 924         } else {
 925             ptr1++;
 926         }
 927         dec1++;
 928     }
 929
 930     if (ndigits > 0) {
 931         ptr1++;
 932         if (!first) {
 933             while (*ptr1 == '0') { /* Process leading zeroes */
 934                 *ptr2++ = *ptr1++;
 935                 dec1--;
 936             }
 937         }
 938         while (*ptr1 != '\0') {
 939             if (!first) first = ptr2;
 940             *ptr2++ = *ptr1++;
 941         }
 942     }
 943
 944     *ptr2 = '\0';
 945
 946     /* We never found a non-zero digit, then our number is either
 947      * smaller than the requested precision, or 0.0 */
 948     if (!first) {
 949         if (number > 0.0) {
 950             first = ptr2;
 951         } else {
 952             first = data->efcvt_buffer;
 953             dec1 = 0;
 954         }
 955     }
 956
 957     *decpt = dec2 ? dec2 : dec1;
 958     return first;
 959 }
 960
 961 /***********************************************************************
 962  *              _gcvt  (MSVCRT.@)
 963  *
 964  * FIXME: uses both E and F.
 965  */
 966 char * CDECL _gcvt( double number, int ndigit, char *buff )
 967 {
 968     sprintf(buff, "%.*E", ndigit, number);
 969     return buff;
 970 }
 971
 972 #include <stdlib.h> /* div_t, ldiv_t */
 973
 974 /*********************************************************************
 975  *              div (MSVCRT.@)
 976  * VERSION
 977  *      [i386] Windows binary compatible - returns the struct in eax/edx.
 978  */
 979 #ifdef __i386__
 980 unsigned __int64 CDECL MSVCRT_div(int num, int denom)
 981 {
 982   div_t dt = div(num,denom);
 983   return ((unsigned __int64)dt.rem << 32) | (unsigned int)dt.quot;
 984 }
 985 #else
 986 /*********************************************************************
 987  *              div (MSVCRT.@)
 988  * VERSION
 989  *      [!i386] Non-x86 can't run win32 apps so we don't need binary compatibility
 990  */
 991 MSVCRT_div_t CDECL MSVCRT_div(int num, int denom)
 992 {
 993   div_t dt = div(num,denom);
 994   MSVCRT_div_t     ret;
 995   ret.quot = dt.quot;
 996   ret.rem = dt.rem;
 997
 998   return ret;
 999
1000 }
1001 #endif /* ifdef __i386__ */
1002
1003
1004 /*********************************************************************
1005  *              ldiv (MSVCRT.@)
1006  * VERSION
1007  *      [i386] Windows binary compatible - returns the struct in eax/edx.
1008  */
1009 #ifdef __i386__
1010 unsigned __int64 CDECL MSVCRT_ldiv(MSVCRT_long num, MSVCRT_long denom)
1011 {
1012   ldiv_t ldt = ldiv(num,denom);
1013   return ((unsigned __int64)ldt.rem << 32) | (MSVCRT_ulong)ldt.quot;
1014 }
1015 #else
1016 /*********************************************************************
1017  *              ldiv (MSVCRT.@)
1018  * VERSION
1019  *      [!i386] Non-x86 can't run win32 apps so we don't need binary compatibility
1020  */
1021 MSVCRT_ldiv_t CDECL MSVCRT_ldiv(MSVCRT_long num, MSVCRT_long denom)
1022 {
1023   ldiv_t result = ldiv(num,denom);
1024
1025   MSVCRT_ldiv_t ret;
1026   ret.quot = result.quot;
1027   ret.rem = result.rem;
1028
1029   return ret;
1030 }
1031 #endif /* ifdef __i386__ */
1032
1033 #ifdef __i386__
1034
1035 /*********************************************************************
1036  *              _adjust_fdiv (MSVCRT.@)
1037  * Used by the MSVC compiler to work around the Pentium FDIV bug.
1038  */
1039 int MSVCRT__adjust_fdiv = 0;
1040
1041 /***********************************************************************
1042  *              _adj_fdiv_m16i (MSVCRT.@)
1043  *
1044  * NOTE
1045  *    I _think_ this function is intended to work around the Pentium
1046  *    fdiv bug.
1047  */
1048 void __stdcall _adj_fdiv_m16i( short arg )
1049 {
1050   TRACE("(): stub\n");
1051 }
1052
1053 /***********************************************************************
1054  *              _adj_fdiv_m32 (MSVCRT.@)
1055  *
1056  * NOTE
1057  *    I _think_ this function is intended to work around the Pentium
1058  *    fdiv bug.
1059  */
1060 void __stdcall _adj_fdiv_m32( unsigned int arg )
1061 {
1062   TRACE("(): stub\n");
1063 }
1064
1065 /***********************************************************************
1066  *              _adj_fdiv_m32i (MSVCRT.@)
1067  *
1068  * NOTE
1069  *    I _think_ this function is intended to work around the Pentium
1070  *    fdiv bug.
1071  */
1072 void __stdcall _adj_fdiv_m32i( int arg )
1073 {
1074   TRACE("(): stub\n");
1075 }
1076
1077 /***********************************************************************
1078  *              _adj_fdiv_m64 (MSVCRT.@)
1079  *
1080  * NOTE
1081  *    I _think_ this function is intended to work around the Pentium
1082  *    fdiv bug.
1083  */
1084 void __stdcall _adj_fdiv_m64( unsigned __int64 arg )
1085 {
1086   TRACE("(): stub\n");
1087 }
1088
1089 /***********************************************************************
1090  *              _adj_fdiv_r (MSVCRT.@)
1091  * FIXME
1092  *    This function is likely to have the wrong number of arguments.
1093  *
1094  * NOTE
1095  *    I _think_ this function is intended to work around the Pentium
1096  *    fdiv bug.
1097  */
1098 void _adj_fdiv_r(void)
1099 {
1100   TRACE("(): stub\n");
1101 }
1102
1103 /***********************************************************************
1104  *              _adj_fdivr_m16i (MSVCRT.@)
1105  *
1106  * NOTE
1107  *    I _think_ this function is intended to work around the Pentium
1108  *    fdiv bug.
1109  */
1110 void __stdcall _adj_fdivr_m16i( short arg )
1111 {
1112   TRACE("(): stub\n");
1113 }
1114
1115 /***********************************************************************
1116  *              _adj_fdivr_m32 (MSVCRT.@)
1117  *
1118  * NOTE
1119  *    I _think_ this function is intended to work around the Pentium
1120  *    fdiv bug.
1121  */
1122 void __stdcall _adj_fdivr_m32( unsigned int arg )
1123 {
1124   TRACE("(): stub\n");
1125 }
1126
1127 /***********************************************************************
1128  *              _adj_fdivr_m32i (MSVCRT.@)
1129  *
1130  * NOTE
1131  *    I _think_ this function is intended to work around the Pentium
1132  *    fdiv bug.
1133  */
1134 void __stdcall _adj_fdivr_m32i( int arg )
1135 {
1136   TRACE("(): stub\n");
1137 }
1138
1139 /***********************************************************************
1140  *              _adj_fdivr_m64 (MSVCRT.@)
1141  *
1142  * NOTE
1143  *    I _think_ this function is intended to work around the Pentium
1144  *    fdiv bug.
1145  */
1146 void __stdcall _adj_fdivr_m64( unsigned __int64 arg )
1147 {
1148   TRACE("(): stub\n");
1149 }
1150
1151 /***********************************************************************
1152  *              _adj_fpatan (MSVCRT.@)
1153  * FIXME
1154  *    This function is likely to have the wrong number of arguments.
1155  *
1156  * NOTE
1157  *    I _think_ this function is intended to work around the Pentium
1158  *    fdiv bug.
1159  */
1160 void _adj_fpatan(void)
1161 {
1162   TRACE("(): stub\n");
1163 }
1164
1165 /***********************************************************************
1166  *              _adj_fprem (MSVCRT.@)
1167  * FIXME
1168  *    This function is likely to have the wrong number of arguments.
1169  *
1170  * NOTE
1171  *    I _think_ this function is intended to work around the Pentium
1172  *    fdiv bug.
1173  */
1174 void _adj_fprem(void)
1175 {
1176   TRACE("(): stub\n");
1177 }
1178
1179 /***********************************************************************
1180  *              _adj_fprem1 (MSVCRT.@)
1181  * FIXME
1182  *    This function is likely to have the wrong number of arguments.
1183  *
1184  * NOTE
1185  *    I _think_ this function is intended to work around the Pentium
1186  *    fdiv bug.
1187  */
1188 void _adj_fprem1(void)
1189 {
1190   TRACE("(): stub\n");
1191 }
1192
1193 /***********************************************************************
1194  *              _adj_fptan (MSVCRT.@)
1195  * FIXME
1196  *    This function is likely to have the wrong number of arguments.
1197  *
1198  * NOTE
1199  *    I _think_ this function is intended to work around the Pentium
1200  *    fdiv bug.
1201  */
1202 void _adj_fptan(void)
1203 {
1204   TRACE("(): stub\n");
1205 }
1206
1207 /***********************************************************************
1208  *              _safe_fdiv (MSVCRT.@)
1209  * FIXME
1210  *    This function is likely to have the wrong number of arguments.
1211  *
1212  * NOTE
1213  *    I _think_ this function is intended to work around the Pentium
1214  *    fdiv bug.
1215  */
1216 void _safe_fdiv(void)
1217 {
1218   TRACE("(): stub\n");
1219 }
1220
1221 /***********************************************************************
1222  *              _safe_fdivr (MSVCRT.@)
1223  * FIXME
1224  *    This function is likely to have the wrong number of arguments.
1225  *
1226  * NOTE
1227  *    I _think_ this function is intended to work around the Pentium
1228  *    fdiv bug.
1229  */
1230 void _safe_fdivr(void)
1231 {
1232   TRACE("(): stub\n");
1233 }
1234
1235 /***********************************************************************
1236  *              _safe_fprem (MSVCRT.@)
1237  * FIXME
1238  *    This function is likely to have the wrong number of arguments.
1239  *
1240  * NOTE
1241  *    I _think_ this function is intended to work around the Pentium
1242  *    fdiv bug.
1243  */
1244 void _safe_fprem(void)
1245 {
1246   TRACE("(): stub\n");
1247 }
1248
1249 /***********************************************************************
1250  *              _safe_fprem1 (MSVCRT.@)
1251  *
1252  * FIXME
1253  *    This function is likely to have the wrong number of arguments.
1254  *
1255  * NOTE
1256  *    I _think_ this function is intended to work around the Pentium
1257  *    fdiv bug.
1258  */
1259 void _safe_fprem1(void)
1260 {
1261   TRACE("(): stub\n");
1262 }
1263
1264 #endif  /* __i386__ */