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 (CDECL *MSVCRT_matherr_func)(struct MSVCRT__exception *);
  51
  52 static MSVCRT_matherr_func MSVCRT_default_matherr_func = NULL;
  53
  54 static BOOL sse2_supported;
  55 static BOOL sse2_enabled;
  56
  57 void msvcrt_init_math(void)
  58 {
  59     sse2_supported = sse2_enabled = IsProcessorFeaturePresent( PF_XMMI64_INSTRUCTIONS_AVAILABLE );
  60 }
  61
  62 /*********************************************************************
  63  *      _set_SSE2_enable (MSVCRT.@)
  64  */
  65 int CDECL MSVCRT__set_SSE2_enable(int flag)
  66 {
  67     sse2_enabled = flag && sse2_supported;
  68     return sse2_enabled;
  69 }
  70
  71 #ifdef __x86_64__
  72
  73 /*********************************************************************
  74  *      MSVCRT_acosf (MSVCRT.@)
  75  */
  76 float CDECL MSVCRT_acosf( float x )
  77 {
  78   if (x < -1.0 || x > 1.0 || !finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
  79   /* glibc implements acos() as the FPU equivalent of atan2(sqrt(1 - x ^ 2), x).
  80    * asin() uses a similar construction. This is bad because as x gets nearer to
  81    * 1 the error in the expression "1 - x^2" can get relatively large due to
  82    * cancellation. The sqrt() makes things worse. A safer way to calculate
  83    * acos() is to use atan2(sqrt((1 - x) * (1 + x)), x). */
  84   return atan2f(sqrtf((1 - x) * (1 + x)), x);
  85 }
  86
  87 /*********************************************************************
  88  *      MSVCRT_asinf (MSVCRT.@)
  89  */
  90 float CDECL MSVCRT_asinf( float x )
  91 {
  92   if (x < -1.0 || x > 1.0 || !finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
  93   return atan2f(x, sqrtf((1 - x) * (1 + x)));
  94 }
  95
  96 /*********************************************************************
  97  *      MSVCRT_atanf (MSVCRT.@)
  98  */
  99 float CDECL MSVCRT_atanf( float x )
 100 {
 101   if (!finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 102   return atanf(x);
 103 }
 104
 105 /*********************************************************************
 106  *              MSVCRT_atan2f (MSVCRT.@)
 107  */
 108 float CDECL MSVCRT_atan2f( float x, float y )
 109 {
 110   if (!finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 111   return atan2f(x,y);
 112 }
 113
 114 /*********************************************************************
 115  *      MSVCRT_cosf (MSVCRT.@)
 116  */
 117 float CDECL MSVCRT_cosf( float x )
 118 {
 119   if (!finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 120   return cosf(x);
 121 }
 122
 123 /*********************************************************************
 124  *      MSVCRT_coshf (MSVCRT.@)
 125  */
 126 float CDECL MSVCRT_coshf( float x )
 127 {
 128   if (!finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 129   return coshf(x);
 130 }
 131
 132 /*********************************************************************
 133  *      MSVCRT_expf (MSVCRT.@)
 134  */
 135 float CDECL MSVCRT_expf( float x )
 136 {
 137   if (!finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 138   return expf(x);
 139 }
 140
 141 /*********************************************************************
 142  *      MSVCRT_fmodf (MSVCRT.@)
 143  */
 144 float CDECL MSVCRT_fmodf( float x, float y )
 145 {
 146   if (!finitef(x) || !finitef(y)) *MSVCRT__errno() = MSVCRT_EDOM;
 147   return fmodf(x,y);
 148 }
 149
 150 /*********************************************************************
 151  *      MSVCRT_logf (MSVCRT.@)
 152  */
 153 float CDECL MSVCRT_logf( float x)
 154 {
 155   if (x < 0.0 || !finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 156   if (x == 0.0) *MSVCRT__errno() = MSVCRT_ERANGE;
 157   return logf(x);
 158 }
 159
 160 /*********************************************************************
 161  *      MSVCRT_log10f (MSVCRT.@)
 162  */
 163 float CDECL MSVCRT_log10f( float x )
 164 {
 165   if (x < 0.0 || !finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 166   if (x == 0.0) *MSVCRT__errno() = MSVCRT_ERANGE;
 167   return log10f(x);
 168 }
 169
 170 /*********************************************************************
 171  *      MSVCRT_powf (MSVCRT.@)
 172  */
 173 float CDECL MSVCRT_powf( float x, float y )
 174 {
 175   /* FIXME: If x < 0 and y is not integral, set EDOM */
 176   float z = powf(x,y);
 177   if (!finitef(z)) *MSVCRT__errno() = MSVCRT_EDOM;
 178   return z;
 179 }
 180
 181 /*********************************************************************
 182  *      MSVCRT_sinf (MSVCRT.@)
 183  */
 184 float CDECL MSVCRT_sinf( float x )
 185 {
 186   if (!finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 187   return sinf(x);
 188 }
 189
 190 /*********************************************************************
 191  *      MSVCRT_sinhf (MSVCRT.@)
 192  */
 193 float CDECL MSVCRT_sinhf( float x )
 194 {
 195   if (!finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 196   return sinhf(x);
 197 }
 198
 199 /*********************************************************************
 200  *      MSVCRT_sqrtf (MSVCRT.@)
 201  */
 202 float CDECL MSVCRT_sqrtf( float x )
 203 {
 204   if (x < 0.0 || !finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 205   return sqrtf(x);
 206 }
 207
 208 /*********************************************************************
 209  *      MSVCRT_tanf (MSVCRT.@)
 210  */
 211 float CDECL MSVCRT_tanf( float x )
 212 {
 213   if (!finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 214   return tanf(x);
 215 }
 216
 217 /*********************************************************************
 218  *      MSVCRT_tanhf (MSVCRT.@)
 219  */
 220 float CDECL MSVCRT_tanhf( float x )
 221 {
 222   if (!finitef(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 223   return tanhf(x);
 224 }
 225
 226 /*********************************************************************
 227  *      ceilf (MSVCRT.@)
 228  */
 229 float CDECL MSVCRT_ceilf( float x )
 230 {
 231   return ceilf(x);
 232 }
 233
 234 /*********************************************************************
 235  *      floorf (MSVCRT.@)
 236  */
 237 float CDECL MSVCRT_floorf( float x )
 238 {
 239   return floorf(x);
 240 }
 241
 242 /*********************************************************************
 243  *      frexpf (MSVCRT.@)
 244  */
 245 float CDECL MSVCRT_frexpf( float x, int *exp )
 246 {
 247   return frexpf( x, exp );
 248 }
 249
 250 /*********************************************************************
 251  *      _scalbf (MSVCRT.@)
 252  */
 253 float CDECL MSVCRT__scalbf(float num, MSVCRT_long power)
 254 {
 255   if (!finitef(num)) *MSVCRT__errno() = MSVCRT_EDOM;
 256   return ldexpf(num, power);
 257 }
 258
 259 /*********************************************************************
 260  *      modff (MSVCRT.@)
 261  */
 262 double CDECL MSVCRT_modff( float x, float *iptr )
 263 {
 264   return modff( x, iptr );
 265 }
 266
 267 #endif
 268
 269 /*********************************************************************
 270  *              MSVCRT_acos (MSVCRT.@)
 271  */
 272 double CDECL MSVCRT_acos( double x )
 273 {
 274   if (x < -1.0 || x > 1.0 || !finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 275   /* glibc implements acos() as the FPU equivalent of atan2(sqrt(1 - x ^ 2), x).
 276    * asin() uses a similar construction. This is bad because as x gets nearer to
 277    * 1 the error in the expression "1 - x^2" can get relatively large due to
 278    * cancellation. The sqrt() makes things worse. A safer way to calculate
 279    * acos() is to use atan2(sqrt((1 - x) * (1 + x)), x). */
 280   return atan2(sqrt((1 - x) * (1 + x)), x);
 281 }
 282
 283 /*********************************************************************
 284  *              MSVCRT_asin (MSVCRT.@)
 285  */
 286 double CDECL MSVCRT_asin( double x )
 287 {
 288   if (x < -1.0 || x > 1.0 || !finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 289   return atan2(x, sqrt((1 - x) * (1 + x)));
 290 }
 291
 292 /*********************************************************************
 293  *              MSVCRT_atan (MSVCRT.@)
 294  */
 295 double CDECL MSVCRT_atan( double x )
 296 {
 297   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 298   return atan(x);
 299 }
 300
 301 /*********************************************************************
 302  *              MSVCRT_atan2 (MSVCRT.@)
 303  */
 304 double CDECL MSVCRT_atan2( double x, double y )
 305 {
 306   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 307   return atan2(x,y);
 308 }
 309
 310 /*********************************************************************
 311  *              MSVCRT_cos (MSVCRT.@)
 312  */
 313 double CDECL MSVCRT_cos( double x )
 314 {
 315   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 316   return cos(x);
 317 }
 318
 319 /*********************************************************************
 320  *              MSVCRT_cosh (MSVCRT.@)
 321  */
 322 double CDECL MSVCRT_cosh( double x )
 323 {
 324   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 325   return cosh(x);
 326 }
 327
 328 /*********************************************************************
 329  *              MSVCRT_exp (MSVCRT.@)
 330  */
 331 double CDECL MSVCRT_exp( double x )
 332 {
 333   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 334   return exp(x);
 335 }
 336
 337 /*********************************************************************
 338  *              MSVCRT_fmod (MSVCRT.@)
 339  */
 340 double CDECL MSVCRT_fmod( double x, double y )
 341 {
 342   if (!finite(x) || !finite(y)) *MSVCRT__errno() = MSVCRT_EDOM;
 343   return fmod(x,y);
 344 }
 345
 346 /*********************************************************************
 347  *              MSVCRT_log (MSVCRT.@)
 348  */
 349 double CDECL MSVCRT_log( double x)
 350 {
 351   if (x < 0.0 || !finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 352   if (x == 0.0) *MSVCRT__errno() = MSVCRT_ERANGE;
 353   return log(x);
 354 }
 355
 356 /*********************************************************************
 357  *              MSVCRT_log10 (MSVCRT.@)
 358  */
 359 double CDECL MSVCRT_log10( double x )
 360 {
 361   if (x < 0.0 || !finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 362   if (x == 0.0) *MSVCRT__errno() = MSVCRT_ERANGE;
 363   return log10(x);
 364 }
 365
 366 /*********************************************************************
 367  *              MSVCRT_pow (MSVCRT.@)
 368  */
 369 double CDECL MSVCRT_pow( double x, double y )
 370 {
 371   /* FIXME: If x < 0 and y is not integral, set EDOM */
 372   double z = pow(x,y);
 373   if (!finite(z)) *MSVCRT__errno() = MSVCRT_EDOM;
 374   return z;
 375 }
 376
 377 /*********************************************************************
 378  *              MSVCRT_sin (MSVCRT.@)
 379  */
 380 double CDECL MSVCRT_sin( double x )
 381 {
 382   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 383   return sin(x);
 384 }
 385
 386 /*********************************************************************
 387  *              MSVCRT_sinh (MSVCRT.@)
 388  */
 389 double CDECL MSVCRT_sinh( double x )
 390 {
 391   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 392   return sinh(x);
 393 }
 394
 395 /*********************************************************************
 396  *              MSVCRT_sqrt (MSVCRT.@)
 397  */
 398 double CDECL MSVCRT_sqrt( double x )
 399 {
 400   if (x < 0.0 || !finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 401   return sqrt(x);
 402 }
 403
 404 /*********************************************************************
 405  *              MSVCRT_tan (MSVCRT.@)
 406  */
 407 double CDECL MSVCRT_tan( double x )
 408 {
 409   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 410   return tan(x);
 411 }
 412
 413 /*********************************************************************
 414  *              MSVCRT_tanh (MSVCRT.@)
 415  */
 416 double CDECL MSVCRT_tanh( double x )
 417 {
 418   if (!finite(x)) *MSVCRT__errno() = MSVCRT_EDOM;
 419   return tanh(x);
 420 }
 421
 422
 423 #if defined(__GNUC__) && defined(__i386__)
 424
 425 #define FPU_DOUBLE(var) double var; \
 426   __asm__ __volatile__( "fstpl %0;fwait" : "=m" (var) : )
 427 #define FPU_DOUBLES(var1,var2) double var1,var2; \
 428   __asm__ __volatile__( "fstpl %0;fwait" : "=m" (var2) : ); \
 429   __asm__ __volatile__( "fstpl %0;fwait" : "=m" (var1) : )
 430
 431 /*********************************************************************
 432  *              _CIacos (MSVCRT.@)
 433  */
 434 double CDECL _CIacos(void)
 435 {
 436   FPU_DOUBLE(x);
 437   return MSVCRT_acos(x);
 438 }
 439
 440 /*********************************************************************
 441  *              _CIasin (MSVCRT.@)
 442  */
 443 double CDECL _CIasin(void)
 444 {
 445   FPU_DOUBLE(x);
 446   return MSVCRT_asin(x);
 447 }
 448
 449 /*********************************************************************
 450  *              _CIatan (MSVCRT.@)
 451  */
 452 double CDECL _CIatan(void)
 453 {
 454   FPU_DOUBLE(x);
 455   return MSVCRT_atan(x);
 456 }
 457
 458 /*********************************************************************
 459  *              _CIatan2 (MSVCRT.@)
 460  */
 461 double CDECL _CIatan2(void)
 462 {
 463   FPU_DOUBLES(x,y);
 464   return MSVCRT_atan2(x,y);
 465 }
 466
 467 /*********************************************************************
 468  *              _CIcos (MSVCRT.@)
 469  */
 470 double CDECL _CIcos(void)
 471 {
 472   FPU_DOUBLE(x);
 473   return MSVCRT_cos(x);
 474 }
 475
 476 /*********************************************************************
 477  *              _CIcosh (MSVCRT.@)
 478  */
 479 double CDECL _CIcosh(void)
 480 {
 481   FPU_DOUBLE(x);
 482   return MSVCRT_cosh(x);
 483 }
 484
 485 /*********************************************************************
 486  *              _CIexp (MSVCRT.@)
 487  */
 488 double CDECL _CIexp(void)
 489 {
 490   FPU_DOUBLE(x);
 491   return MSVCRT_exp(x);
 492 }
 493
 494 /*********************************************************************
 495  *              _CIfmod (MSVCRT.@)
 496  */
 497 double CDECL _CIfmod(void)
 498 {
 499   FPU_DOUBLES(x,y);
 500   return MSVCRT_fmod(x,y);
 501 }
 502
 503 /*********************************************************************
 504  *              _CIlog (MSVCRT.@)
 505  */
 506 double CDECL _CIlog(void)
 507 {
 508   FPU_DOUBLE(x);
 509   return MSVCRT_log(x);
 510 }
 511
 512 /*********************************************************************
 513  *              _CIlog10 (MSVCRT.@)
 514  */
 515 double CDECL _CIlog10(void)
 516 {
 517   FPU_DOUBLE(x);
 518   return MSVCRT_log10(x);
 519 }
 520
 521 /*********************************************************************
 522  *              _CIpow (MSVCRT.@)
 523  */
 524 double CDECL _CIpow(void)
 525 {
 526   FPU_DOUBLES(x,y);
 527   return MSVCRT_pow(x,y);
 528 }
 529
 530 /*********************************************************************
 531  *              _CIsin (MSVCRT.@)
 532  */
 533 double CDECL _CIsin(void)
 534 {
 535   FPU_DOUBLE(x);
 536   return MSVCRT_sin(x);
 537 }
 538
 539 /*********************************************************************
 540  *              _CIsinh (MSVCRT.@)
 541  */
 542 double CDECL _CIsinh(void)
 543 {
 544   FPU_DOUBLE(x);
 545   return MSVCRT_sinh(x);
 546 }
 547
 548 /*********************************************************************
 549  *              _CIsqrt (MSVCRT.@)
 550  */
 551 double CDECL _CIsqrt(void)
 552 {
 553   FPU_DOUBLE(x);
 554   return MSVCRT_sqrt(x);
 555 }
 556
 557 /*********************************************************************
 558  *              _CItan (MSVCRT.@)
 559  */
 560 double CDECL _CItan(void)
 561 {
 562   FPU_DOUBLE(x);
 563   return MSVCRT_tan(x);
 564 }
 565
 566 /*********************************************************************
 567  *              _CItanh (MSVCRT.@)
 568  */
 569 double CDECL _CItanh(void)
 570 {
 571   FPU_DOUBLE(x);
 572   return MSVCRT_tanh(x);
 573 }
 574
 575 #endif /* defined(__GNUC__) && defined(__i386__) */
 576
 577 /*********************************************************************
 578  *              _fpclass (MSVCRT.@)
 579  */
 580 int CDECL _fpclass(double num)
 581 {
 582 #if defined(HAVE_FPCLASS) || defined(fpclass)
 583   switch (fpclass( num ))
 584   {
 585 #ifdef FP_SNAN
 586   case FP_SNAN:  return MSVCRT__FPCLASS_SNAN;
 587 #endif
 588 #ifdef FP_QNAN
 589   case FP_QNAN:  return MSVCRT__FPCLASS_QNAN;
 590 #endif
 591 #ifdef FP_NINF
 592   case FP_NINF:  return MSVCRT__FPCLASS_NINF;
 593 #endif
 594 #ifdef FP_PINF
 595   case FP_PINF:  return MSVCRT__FPCLASS_PINF;
 596 #endif
 597 #ifdef FP_NDENORM
 598   case FP_NDENORM: return MSVCRT__FPCLASS_ND;
 599 #endif
 600 #ifdef FP_PDENORM
 601   case FP_PDENORM: return MSVCRT__FPCLASS_PD;
 602 #endif
 603 #ifdef FP_NZERO
 604   case FP_NZERO: return MSVCRT__FPCLASS_NZ;
 605 #endif
 606 #ifdef FP_PZERO
 607   case FP_PZERO: return MSVCRT__FPCLASS_PZ;
 608 #endif
 609 #ifdef FP_NNORM
 610   case FP_NNORM: return MSVCRT__FPCLASS_NN;
 611 #endif
 612 #ifdef FP_PNORM
 613   case FP_PNORM: return MSVCRT__FPCLASS_PN;
 614 #endif
 615   default: return MSVCRT__FPCLASS_PN;
 616   }
 617 #elif defined (fpclassify)
 618   switch (fpclassify( num ))
 619   {
 620   case FP_NAN: return MSVCRT__FPCLASS_QNAN;
 621   case FP_INFINITE: return signbit(num) ? MSVCRT__FPCLASS_NINF : MSVCRT__FPCLASS_PINF;
 622   case FP_SUBNORMAL: return signbit(num) ?MSVCRT__FPCLASS_ND : MSVCRT__FPCLASS_PD;
 623   case FP_ZERO: return signbit(num) ? MSVCRT__FPCLASS_NZ : MSVCRT__FPCLASS_PZ;
 624   }
 625   return signbit(num) ? MSVCRT__FPCLASS_NN : MSVCRT__FPCLASS_PN;
 626 #else
 627   if (!finite(num))
 628     return MSVCRT__FPCLASS_QNAN;
 629   return num == 0.0 ? MSVCRT__FPCLASS_PZ : (num < 0 ? MSVCRT__FPCLASS_NN : MSVCRT__FPCLASS_PN);
 630 #endif
 631 }
 632
 633 /*********************************************************************
 634  *              _rotl (MSVCRT.@)
 635  */
 636 unsigned int CDECL _rotl(unsigned int num, int shift)
 637 {
 638   shift &= 31;
 639   return (num << shift) | (num >> (32-shift));
 640 }
 641
 642 /*********************************************************************
 643  *              _logb (MSVCRT.@)
 644  */
 645 double CDECL _logb(double num)
 646 {
 647   if (!finite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
 648   return logb(num);
 649 }
 650
 651 /*********************************************************************
 652  *              _lrotl (MSVCRT.@)
 653  */
 654 MSVCRT_ulong CDECL MSVCRT__lrotl(MSVCRT_ulong num, int shift)
 655 {
 656   shift &= 0x1f;
 657   return (num << shift) | (num >> (32-shift));
 658 }
 659
 660 /*********************************************************************
 661  *              _lrotr (MSVCRT.@)
 662  */
 663 MSVCRT_ulong CDECL MSVCRT__lrotr(MSVCRT_ulong num, int shift)
 664 {
 665   shift &= 0x1f;
 666   return (num >> shift) | (num << (32-shift));
 667 }
 668
 669 /*********************************************************************
 670  *              _rotr (MSVCRT.@)
 671  */
 672 unsigned int CDECL _rotr(unsigned int num, int shift)
 673 {
 674     shift &= 0x1f;
 675     return (num >> shift) | (num << (32-shift));
 676 }
 677
 678 /*********************************************************************
 679  *              _scalb (MSVCRT.@)
 680  */
 681 double CDECL MSVCRT__scalb(double num, MSVCRT_long power)
 682 {
 683   if (!finite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
 684   return ldexp(num, power);
 685 }
 686
 687 /*********************************************************************
 688  *              _hypot (MSVCRT.@)
 689  */
 690 double CDECL _hypot(double x, double y)
 691 {
 692   /* FIXME: errno handling */
 693   return hypot( x, y );
 694 }
 695
 696 /*********************************************************************
 697  *      _hypotf (MSVCRT.@)
 698  */
 699 float CDECL _hypotf(float x, float y)
 700 {
 701   /* FIXME: errno handling */
 702   return hypotf( x, y );
 703 }
 704
 705 /*********************************************************************
 706  *              ceil (MSVCRT.@)
 707  */
 708 double CDECL MSVCRT_ceil( double x )
 709 {
 710   return ceil(x);
 711 }
 712
 713 /*********************************************************************
 714  *              floor (MSVCRT.@)
 715  */
 716 double CDECL MSVCRT_floor( double x )
 717 {
 718   return floor(x);
 719 }
 720
 721 /*********************************************************************
 722  *              fabs (MSVCRT.@)
 723  */
 724 double CDECL MSVCRT_fabs( double x )
 725 {
 726   return fabs(x);
 727 }
 728
 729 /*********************************************************************
 730  *              frexp (MSVCRT.@)
 731  */
 732 double CDECL MSVCRT_frexp( double x, int *exp )
 733 {
 734   return frexp( x, exp );
 735 }
 736
 737 /*********************************************************************
 738  *              modf (MSVCRT.@)
 739  */
 740 double CDECL MSVCRT_modf( double x, double *iptr )
 741 {
 742   return modf( x, iptr );
 743 }
 744
 745 /*********************************************************************
 746  *              _matherr (MSVCRT.@)
 747  */
 748 int CDECL MSVCRT__matherr(struct MSVCRT__exception *e)
 749 {
 750   if (e)
 751     TRACE("(%p = %d, %s, %g %g %g)\n",e, e->type, e->name, e->arg1, e->arg2,
 752           e->retval);
 753   else
 754     TRACE("(null)\n");
 755   if (MSVCRT_default_matherr_func)
 756     return MSVCRT_default_matherr_func(e);
 757   ERR(":Unhandled math error!\n");
 758   return 0;
 759 }
 760
 761 /*********************************************************************
 762  *              __setusermatherr (MSVCRT.@)
 763  */
 764 void CDECL MSVCRT___setusermatherr(MSVCRT_matherr_func func)
 765 {
 766   MSVCRT_default_matherr_func = func;
 767   TRACE(":new matherr handler %p\n", func);
 768 }
 769
 770 /**********************************************************************
 771  *              _statusfp (MSVCRT.@)
 772  */
 773 unsigned int CDECL _statusfp(void)
 774 {
 775    unsigned int retVal = 0;
 776 #if defined(__GNUC__) && defined(__i386__)
 777   unsigned int fpword;
 778
 779   __asm__ __volatile__( "fstsw %0" : "=m" (fpword) : );
 780   if (fpword & 0x1)  retVal |= MSVCRT__SW_INVALID;
 781   if (fpword & 0x2)  retVal |= MSVCRT__SW_DENORMAL;
 782   if (fpword & 0x4)  retVal |= MSVCRT__SW_ZERODIVIDE;
 783   if (fpword & 0x8)  retVal |= MSVCRT__SW_OVERFLOW;
 784   if (fpword & 0x10) retVal |= MSVCRT__SW_UNDERFLOW;
 785   if (fpword & 0x20) retVal |= MSVCRT__SW_INEXACT;
 786 #else
 787   FIXME(":Not implemented!\n");
 788 #endif
 789   return retVal;
 790 }
 791
 792 /*********************************************************************
 793  *              _clearfp (MSVCRT.@)
 794  */
 795 unsigned int CDECL _clearfp(void)
 796 {
 797   unsigned int retVal = _statusfp();
 798 #if defined(__GNUC__) && defined(__i386__)
 799   __asm__ __volatile__( "fnclex" );
 800 #else
 801   FIXME(":Not Implemented\n");
 802 #endif
 803   return retVal;
 804 }
 805
 806 /*********************************************************************
 807  *              __fpecode (MSVCRT.@)
 808  */
 809 int * CDECL __fpecode(void)
 810 {
 811     return &msvcrt_get_thread_data()->fpecode;
 812 }
 813
 814 /*********************************************************************
 815  *              ldexp (MSVCRT.@)
 816  */
 817 double CDECL MSVCRT_ldexp(double num, MSVCRT_long exp)
 818 {
 819   double z = ldexp(num,exp);
 820
 821   if (!finite(z))
 822     *MSVCRT__errno() = MSVCRT_ERANGE;
 823   else if (z == 0 && signbit(z))
 824     z = 0.0; /* Convert -0 -> +0 */
 825   return z;
 826 }
 827
 828 /*********************************************************************
 829  *              _cabs (MSVCRT.@)
 830  */
 831 double CDECL MSVCRT__cabs(struct MSVCRT__complex num)
 832 {
 833   return sqrt(num.x * num.x + num.y * num.y);
 834 }
 835
 836 /*********************************************************************
 837  *              _chgsign (MSVCRT.@)
 838  */
 839 double CDECL _chgsign(double num)
 840 {
 841   /* FIXME: +-infinity,Nan not tested */
 842   return -num;
 843 }
 844
 845 /*********************************************************************
 846  *              __control87_2 (MSVCRT.@)
 847  *
 848  * Not exported by native msvcrt, added in msvcr80.
 849  */
 850 #if defined(__i386__) || defined(__x86_64__)
 851 int CDECL __control87_2( unsigned int newval, unsigned int mask,
 852                          unsigned int *x86_cw, unsigned int *sse2_cw )
 853 {
 854 #ifdef __GNUC__
 855     unsigned long fpword;
 856     unsigned int flags;
 857
 858     if (x86_cw)
 859     {
 860         __asm__ __volatile__( "fstcw %0" : "=m" (fpword) );
 861
 862         /* Convert into mask constants */
 863         flags = 0;
 864         if (fpword & 0x1)  flags |= MSVCRT__EM_INVALID;
 865         if (fpword & 0x2)  flags |= MSVCRT__EM_DENORMAL;
 866         if (fpword & 0x4)  flags |= MSVCRT__EM_ZERODIVIDE;
 867         if (fpword & 0x8)  flags |= MSVCRT__EM_OVERFLOW;
 868         if (fpword & 0x10) flags |= MSVCRT__EM_UNDERFLOW;
 869         if (fpword & 0x20) flags |= MSVCRT__EM_INEXACT;
 870         switch (fpword & 0xc00)
 871         {
 872         case 0xc00: flags |= MSVCRT__RC_UP|MSVCRT__RC_DOWN; break;
 873         case 0x800: flags |= MSVCRT__RC_UP; break;
 874         case 0x400: flags |= MSVCRT__RC_DOWN; break;
 875         }
 876         switch (fpword & 0x300)
 877         {
 878         case 0x0:   flags |= MSVCRT__PC_24; break;
 879         case 0x200: flags |= MSVCRT__PC_53; break;
 880         case 0x300: flags |= MSVCRT__PC_64; break;
 881         }
 882         if (fpword & 0x1000) flags |= MSVCRT__IC_AFFINE;
 883
 884         TRACE( "x86 flags=%08x newval=%08x mask=%08x\n", flags, newval, mask );
 885         if (mask)
 886         {
 887             flags = (flags & ~mask) | (newval & mask);
 888
 889             /* Convert (masked) value back to fp word */
 890             fpword = 0;
 891             if (flags & MSVCRT__EM_INVALID)    fpword |= 0x1;
 892             if (flags & MSVCRT__EM_DENORMAL)   fpword |= 0x2;
 893             if (flags & MSVCRT__EM_ZERODIVIDE) fpword |= 0x4;
 894             if (flags & MSVCRT__EM_OVERFLOW)   fpword |= 0x8;
 895             if (flags & MSVCRT__EM_UNDERFLOW)  fpword |= 0x10;
 896             if (flags & MSVCRT__EM_INEXACT)    fpword |= 0x20;
 897             switch (flags & MSVCRT__MCW_RC)
 898             {
 899             case MSVCRT__RC_UP|MSVCRT__RC_DOWN: fpword |= 0xc00; break;
 900             case MSVCRT__RC_UP:                 fpword |= 0x800; break;
 901             case MSVCRT__RC_DOWN:               fpword |= 0x400; break;
 902             }
 903             switch (flags & MSVCRT__MCW_PC)
 904             {
 905             case MSVCRT__PC_64: fpword |= 0x300; break;
 906             case MSVCRT__PC_53: fpword |= 0x200; break;
 907             case MSVCRT__PC_24: fpword |= 0x0; break;
 908             }
 909             if (flags & MSVCRT__IC_AFFINE) fpword |= 0x1000;
 910
 911             __asm__ __volatile__( "fldcw %0" : : "m" (fpword) );
 912         }
 913         *x86_cw = flags;
 914     }
 915
 916     if (!sse2_cw) return 1;
 917
 918     if (sse2_supported)
 919     {
 920         __asm__ __volatile__( "stmxcsr %0" : "=m" (fpword) );
 921
 922         /* Convert into mask constants */
 923         flags = 0;
 924         if (fpword & 0x80)   flags |= MSVCRT__EM_INVALID;
 925         if (fpword & 0x100)  flags |= MSVCRT__EM_DENORMAL;
 926         if (fpword & 0x200)  flags |= MSVCRT__EM_ZERODIVIDE;
 927         if (fpword & 0x400)  flags |= MSVCRT__EM_OVERFLOW;
 928         if (fpword & 0x800)  flags |= MSVCRT__EM_UNDERFLOW;
 929         if (fpword & 0x1000) flags |= MSVCRT__EM_INEXACT;
 930         switch (fpword & 0x6000)
 931         {
 932         case 0x6000: flags |= MSVCRT__RC_UP|MSVCRT__RC_DOWN; break;
 933         case 0x4000: flags |= MSVCRT__RC_UP; break;
 934         case 0x2000: flags |= MSVCRT__RC_DOWN; break;
 935         }
 936         switch (fpword & 0x8040)
 937         {
 938         case 0x0040: flags |= MSVCRT__DN_FLUSH_OPERANDS_SAVE_RESULTS; break;
 939         case 0x8000: flags |= MSVCRT__DN_SAVE_OPERANDS_FLUSH_RESULTS; break;
 940         case 0x8040: flags |= MSVCRT__DN_FLUSH; break;
 941         }
 942
 943         TRACE( "sse2 flags=%08x newval=%08x mask=%08x\n", flags, newval, mask );
 944         if (mask)
 945         {
 946             flags = (flags & ~mask) | (newval & mask);
 947
 948             /* Convert (masked) value back to fp word */
 949             fpword = 0;
 950             if (flags & MSVCRT__EM_INVALID)    fpword |= 0x80;
 951             if (flags & MSVCRT__EM_DENORMAL)   fpword |= 0x100;
 952             if (flags & MSVCRT__EM_ZERODIVIDE) fpword |= 0x200;
 953             if (flags & MSVCRT__EM_OVERFLOW)   fpword |= 0x400;
 954             if (flags & MSVCRT__EM_UNDERFLOW)  fpword |= 0x800;
 955             if (flags & MSVCRT__EM_INEXACT)    fpword |= 0x1000;
 956             switch (flags & MSVCRT__MCW_RC)
 957             {
 958             case MSVCRT__RC_UP|MSVCRT__RC_DOWN: fpword |= 0x6000; break;
 959             case MSVCRT__RC_UP:                 fpword |= 0x4000; break;
 960             case MSVCRT__RC_DOWN:               fpword |= 0x2000; break;
 961             }
 962             switch (flags & MSVCRT__MCW_DN)
 963             {
 964             case MSVCRT__DN_FLUSH_OPERANDS_SAVE_RESULTS: fpword |= 0x0040; break;
 965             case MSVCRT__DN_SAVE_OPERANDS_FLUSH_RESULTS: fpword |= 0x8000; break;
 966             case MSVCRT__DN_FLUSH:                       fpword |= 0x8040; break;
 967             }
 968             __asm__ __volatile__( "ldmxcsr %0" : : "m" (fpword) );
 969         }
 970         *sse2_cw = flags;
 971     }
 972     else *sse2_cw = 0;
 973
 974     return 1;
 975 #else
 976     FIXME( "not implemented\n" );
 977     return 0;
 978 #endif
 979 }
 980 #endif
 981
 982 /*********************************************************************
 983  *              _control87 (MSVCRT.@)
 984  */
 985 unsigned int CDECL _control87(unsigned int newval, unsigned int mask)
 986 {
 987 #if defined(__i386__) || defined(__x86_64__)
 988     unsigned int x86_cw, sse2_cw;
 989
 990     __control87_2( newval, mask, &x86_cw, &sse2_cw );
 991
 992     if ((x86_cw ^ sse2_cw) & (MSVCRT__MCW_EM | MSVCRT__MCW_RC)) x86_cw |= MSVCRT__EM_AMBIGUOUS;
 993     return x86_cw;
 994 #else
 995     FIXME( "not implemented\n" );
 996     return 0;
 997 #endif
 998 }
 999
1000 /*********************************************************************
1001  *              _controlfp (MSVCRT.@)
1002  */
1003 unsigned int CDECL _controlfp(unsigned int newval, unsigned int mask)
1004 {
1005   return _control87( newval, mask & ~MSVCRT__EM_DENORMAL );
1006 }
1007
1008 /*********************************************************************
1009  *              _controlfp_s (MSVCRT.@)
1010  */
1011 int CDECL _controlfp_s(unsigned int *cur, unsigned int newval, unsigned int mask)
1012 {
1013     static const unsigned int all_flags = (MSVCRT__MCW_EM | MSVCRT__MCW_IC | MSVCRT__MCW_RC |
1014                                            MSVCRT__MCW_PC | MSVCRT__MCW_DN);
1015     unsigned int val;
1016
1017     if (!MSVCRT_CHECK_PMT( !(newval & mask & ~all_flags) ))
1018     {
1019         if (cur) *cur = _controlfp( 0, 0 );  /* retrieve it anyway */
1020         *MSVCRT__errno() = MSVCRT_EINVAL;
1021         return MSVCRT_EINVAL;
1022     }
1023     val = _controlfp( newval, mask );
1024     if (cur) *cur = val;
1025     return 0;
1026 }
1027
1028 /*********************************************************************
1029  *              _copysign (MSVCRT.@)
1030  */
1031 double CDECL _copysign(double num, double sign)
1032 {
1033   /* FIXME: Behaviour for Nan/Inf? */
1034   if (sign < 0.0)
1035     return num < 0.0 ? num : -num;
1036   return num < 0.0 ? -num : num;
1037 }
1038
1039 /*********************************************************************
1040  *              _finite (MSVCRT.@)
1041  */
1042 int CDECL _finite(double num)
1043 {
1044   return (finite(num)?1:0); /* See comment for _isnan() */
1045 }
1046
1047 /*********************************************************************
1048  *              _fpreset (MSVCRT.@)
1049  */
1050 void CDECL _fpreset(void)
1051 {
1052 #if defined(__GNUC__) && defined(__i386__)
1053   __asm__ __volatile__( "fninit" );
1054 #else
1055   FIXME(":Not Implemented!\n");
1056 #endif
1057 }
1058
1059 /*********************************************************************
1060  *              _isnan (MSVCRT.@)
1061  */
1062 INT CDECL _isnan(double num)
1063 {
1064   /* Some implementations return -1 for true(glibc), msvcrt/crtdll return 1.
1065    * Do the same, as the result may be used in calculations
1066    */
1067   return isnan(num) ? 1 : 0;
1068 }
1069
1070 /*********************************************************************
1071  *              _j0 (MSVCRT.@)
1072  */
1073 double CDECL _j0(double num)
1074 {
1075   /* FIXME: errno handling */
1076   return j0(num);
1077 }
1078
1079 /*********************************************************************
1080  *              _j1 (MSVCRT.@)
1081  */
1082 double CDECL _j1(double num)
1083 {
1084   /* FIXME: errno handling */
1085   return j1(num);
1086 }
1087
1088 /*********************************************************************
1089  *              jn (MSVCRT.@)
1090  */
1091 double CDECL _jn(int n, double num)
1092 {
1093   /* FIXME: errno handling */
1094   return jn(n, num);
1095 }
1096
1097 /*********************************************************************
1098  *              _y0 (MSVCRT.@)
1099  */
1100 double CDECL _y0(double num)
1101 {
1102   double retval;
1103   if (!finite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
1104   retval  = y0(num);
1105   if (_fpclass(retval) == MSVCRT__FPCLASS_NINF)
1106   {
1107     *MSVCRT__errno() = MSVCRT_EDOM;
1108     retval = sqrt(-1);
1109   }
1110   return retval;
1111 }
1112
1113 /*********************************************************************
1114  *              _y1 (MSVCRT.@)
1115  */
1116 double CDECL _y1(double num)
1117 {
1118   double retval;
1119   if (!finite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
1120   retval  = y1(num);
1121   if (_fpclass(retval) == MSVCRT__FPCLASS_NINF)
1122   {
1123     *MSVCRT__errno() = MSVCRT_EDOM;
1124     retval = sqrt(-1);
1125   }
1126   return retval;
1127 }
1128
1129 /*********************************************************************
1130  *              _yn (MSVCRT.@)
1131  */
1132 double CDECL _yn(int order, double num)
1133 {
1134   double retval;
1135   if (!finite(num)) *MSVCRT__errno() = MSVCRT_EDOM;
1136   retval  = yn(order,num);
1137   if (_fpclass(retval) == MSVCRT__FPCLASS_NINF)
1138   {
1139     *MSVCRT__errno() = MSVCRT_EDOM;
1140     retval = sqrt(-1);
1141   }
1142   return retval;
1143 }
1144
1145 /*********************************************************************
1146  *              _nextafter (MSVCRT.@)
1147  */
1148 double CDECL _nextafter(double num, double next)
1149 {
1150   double retval;
1151   if (!finite(num) || !finite(next)) *MSVCRT__errno() = MSVCRT_EDOM;
1152   retval = nextafter(num,next);
1153   return retval;
1154 }
1155
1156 /*********************************************************************
1157  *              _ecvt (MSVCRT.@)
1158  */
1159 char * CDECL _ecvt( double number, int ndigits, int *decpt, int *sign )
1160 {
1161     int prec, len;
1162     thread_data_t *data = msvcrt_get_thread_data();
1163     /* FIXME: check better for overflow (native supports over 300 chars's) */
1164     ndigits = min( ndigits, 80 - 7); /* 7 : space for dec point, 1 for "e",
1165                                       * 4 for exponent and one for
1166                                       * terminating '\0' */
1167     if (!data->efcvt_buffer)
1168         data->efcvt_buffer = MSVCRT_malloc( 80 ); /* ought to be enough */
1169
1170     if( number < 0) {
1171         *sign = TRUE;
1172         number = -number;
1173     } else
1174         *sign = FALSE;
1175     /* handle cases with zero ndigits or less */
1176     prec = ndigits;
1177     if( prec < 1) prec = 2;
1178     len = snprintf(data->efcvt_buffer, 80, "%.*le", prec - 1, number);
1179     /* take the decimal "point away */
1180     if( prec != 1)
1181         memmove( data->efcvt_buffer + 1, data->efcvt_buffer + 2, len - 1 );
1182     /* take the exponential "e" out */
1183     data->efcvt_buffer[ prec] = '\0';
1184     /* read the exponent */
1185     sscanf( data->efcvt_buffer + prec + 1, "%d", decpt);
1186     (*decpt)++;
1187     /* adjust for some border cases */
1188     if( data->efcvt_buffer[0] == '0')/* value is zero */
1189         *decpt = 0;
1190     /* handle cases with zero ndigits or less */
1191     if( ndigits < 1){
1192         if( data->efcvt_buffer[ 0] >= '5')
1193             (*decpt)++;
1194         data->efcvt_buffer[ 0] = '\0';
1195     }
1196     TRACE("out=\"%s\"\n",data->efcvt_buffer);
1197     return data->efcvt_buffer;
1198 }
1199
1200 /*********************************************************************
1201  *              _ecvt_s (MSVCRT.@)
1202  */
1203 int CDECL _ecvt_s( char *buffer, MSVCRT_size_t length, double number, int ndigits, int *decpt, int *sign )
1204 {
1205     int prec, len;
1206     char *result;
1207     const char infret[] = "1#INF";
1208
1209     if(!MSVCRT_CHECK_PMT(buffer != NULL) || !MSVCRT_CHECK_PMT(decpt != NULL) || !MSVCRT_CHECK_PMT(sign != NULL))
1210     {
1211         *MSVCRT__errno() = MSVCRT_EINVAL;
1212         return MSVCRT_EINVAL;
1213     }
1214     if(!MSVCRT_CHECK_PMT(length > 2) || !MSVCRT_CHECK_PMT(ndigits < (int)length - 1))
1215     {
1216         *MSVCRT__errno() = MSVCRT_ERANGE;
1217         return MSVCRT_ERANGE;
1218     }
1219
1220     /* special case - inf */
1221     if(number == HUGE_VAL || number == -HUGE_VAL)
1222     {
1223         memset(buffer, '0', ndigits);
1224         memcpy(buffer, infret, min(ndigits, sizeof(infret) - 1 ) );
1225         buffer[ndigits] = '\0';
1226         (*decpt) = 1;
1227         if(number == -HUGE_VAL)
1228             (*sign) = 1;
1229         else
1230             (*sign) = 0;
1231         return 0;
1232     }
1233     result = (char*)MSVCRT_malloc(max(ndigits + 7, 7));
1234
1235     if( number < 0) {
1236         *sign = TRUE;
1237         number = -number;
1238     } else
1239         *sign = FALSE;
1240     /* handle cases with zero ndigits or less */
1241     prec = ndigits;
1242     if( prec < 1) prec = 2;
1243     len = snprintf(result, 80, "%.*le", prec - 1, number);
1244     /* take the decimal "point away */
1245     if( prec != 1)
1246         memmove( result + 1, result + 2, len - 1 );
1247     /* take the exponential "e" out */
1248     result[ prec] = '\0';
1249     /* read the exponent */
1250     sscanf( result + prec + 1, "%d", decpt);
1251     (*decpt)++;
1252     /* adjust for some border cases */
1253     if( result[0] == '0')/* value is zero */
1254         *decpt = 0;
1255     /* handle cases with zero ndigits or less */
1256     if( ndigits < 1){
1257         if( result[ 0] >= '5')
1258             (*decpt)++;
1259         result[ 0] = '\0';
1260     }
1261     memcpy( buffer, result, max(ndigits + 1, 1) );
1262     MSVCRT_free( result );
1263     return 0;
1264 }
1265
1266 /***********************************************************************
1267  *              _fcvt  (MSVCRT.@)
1268  */
1269 char * CDECL _fcvt( double number, int ndigits, int *decpt, int *sign )
1270 {
1271     thread_data_t *data = msvcrt_get_thread_data();
1272     int stop, dec1, dec2;
1273     char *ptr1, *ptr2, *first;
1274     char buf[80]; /* ought to be enough */
1275
1276     if (!data->efcvt_buffer)
1277         data->efcvt_buffer = MSVCRT_malloc( 80 ); /* ought to be enough */
1278
1279     if (number < 0)
1280     {
1281         *sign = 1;
1282         number = -number;
1283     } else *sign = 0;
1284
1285     snprintf(buf, 80, "%.*f", ndigits < 0 ? 0 : ndigits, number);
1286     ptr1 = buf;
1287     ptr2 = data->efcvt_buffer;
1288     first = NULL;
1289     dec1 = 0;
1290     dec2 = 0;
1291
1292     /* For numbers below the requested resolution, work out where
1293        the decimal point will be rather than finding it in the string */
1294     if (number < 1.0 && number > 0.0) {
1295         dec2 = log10(number + 1e-10);
1296         if (-dec2 <= ndigits) dec2 = 0;
1297     }
1298
1299     /* If requested digits is zero or less, we will need to truncate
1300      * the returned string */
1301     if (ndigits < 1) {
1302         stop = strlen(buf) + ndigits;
1303     } else {
1304         stop = strlen(buf);
1305     }
1306
1307     while (*ptr1 == '0') ptr1++; /* Skip leading zeroes */
1308     while (*ptr1 != '\0' && *ptr1 != '.') {
1309         if (!first) first = ptr2;
1310         if ((ptr1 - buf) < stop) {
1311             *ptr2++ = *ptr1++;
1312         } else {
1313             ptr1++;
1314         }
1315         dec1++;
1316     }
1317
1318     if (ndigits > 0) {
1319         ptr1++;
1320         if (!first) {
1321             while (*ptr1 == '0') { /* Process leading zeroes */
1322                 *ptr2++ = *ptr1++;
1323                 dec1--;
1324             }
1325         }
1326         while (*ptr1 != '\0') {
1327             if (!first) first = ptr2;
1328             *ptr2++ = *ptr1++;
1329         }
1330     }
1331
1332     *ptr2 = '\0';
1333
1334     /* We never found a non-zero digit, then our number is either
1335      * smaller than the requested precision, or 0.0 */
1336     if (!first) {
1337         if (number > 0.0) {
1338             first = ptr2;
1339         } else {
1340             first = data->efcvt_buffer;
1341             dec1 = 0;
1342         }
1343     }
1344
1345     *decpt = dec2 ? dec2 : dec1;
1346     return first;
1347 }
1348
1349 /***********************************************************************
1350  *              _gcvt  (MSVCRT.@)
1351  */
1352 char * CDECL _gcvt( double number, int ndigit, char *buff )
1353 {
1354     if(!buff) {
1355         *MSVCRT__errno() = MSVCRT_EINVAL;
1356         return NULL;
1357     }
1358
1359     if(ndigit < 0) {
1360         *MSVCRT__errno() = MSVCRT_ERANGE;
1361         return NULL;
1362     }
1363
1364     MSVCRT_sprintf(buff, "%.*g", ndigit, number);
1365     return buff;
1366 }
1367
1368 /***********************************************************************
1369  *              _gcvt_s  (MSVCRT.@)
1370  */
1371 int CDECL _gcvt_s(char *buff, MSVCRT_size_t size, double number, int digits)
1372 {
1373     int len;
1374
1375     if(!buff) {
1376         *MSVCRT__errno() = MSVCRT_EINVAL;
1377         return MSVCRT_EINVAL;
1378     }
1379
1380     if( digits<0 || digits>=size) {
1381         if(size)
1382             buff[0] = '\0';
1383
1384         *MSVCRT__errno() = MSVCRT_ERANGE;
1385         return MSVCRT_ERANGE;
1386     }
1387
1388     len = MSVCRT__scprintf("%.*g", digits, number);
1389     if(len > size) {
1390         buff[0] = '\0';
1391         *MSVCRT__errno() = MSVCRT_ERANGE;
1392         return MSVCRT_ERANGE;
1393     }
1394
1395     MSVCRT_sprintf(buff, "%.*g", digits, number);
1396     return 0;
1397 }
1398
1399 #include <stdlib.h> /* div_t, ldiv_t */
1400
1401 /*********************************************************************
1402  *              div (MSVCRT.@)
1403  * VERSION
1404  *      [i386] Windows binary compatible - returns the struct in eax/edx.
1405  */
1406 #ifdef __i386__
1407 unsigned __int64 CDECL MSVCRT_div(int num, int denom)
1408 {
1409   div_t dt = div(num,denom);
1410   return ((unsigned __int64)dt.rem << 32) | (unsigned int)dt.quot;
1411 }
1412 #else
1413 /*********************************************************************
1414  *              div (MSVCRT.@)
1415  * VERSION
1416  *      [!i386] Non-x86 can't run win32 apps so we don't need binary compatibility
1417  */
1418 MSVCRT_div_t CDECL MSVCRT_div(int num, int denom)
1419 {
1420   div_t dt = div(num,denom);
1421   MSVCRT_div_t     ret;
1422   ret.quot = dt.quot;
1423   ret.rem = dt.rem;
1424
1425   return ret;
1426
1427 }
1428 #endif /* ifdef __i386__ */
1429
1430
1431 /*********************************************************************
1432  *              ldiv (MSVCRT.@)
1433  * VERSION
1434  *      [i386] Windows binary compatible - returns the struct in eax/edx.
1435  */
1436 #ifdef __i386__
1437 unsigned __int64 CDECL MSVCRT_ldiv(MSVCRT_long num, MSVCRT_long denom)
1438 {
1439   ldiv_t ldt = ldiv(num,denom);
1440   return ((unsigned __int64)ldt.rem << 32) | (MSVCRT_ulong)ldt.quot;
1441 }
1442 #else
1443 /*********************************************************************
1444  *              ldiv (MSVCRT.@)
1445  * VERSION
1446  *      [!i386] Non-x86 can't run win32 apps so we don't need binary compatibility
1447  */
1448 MSVCRT_ldiv_t CDECL MSVCRT_ldiv(MSVCRT_long num, MSVCRT_long denom)
1449 {
1450   ldiv_t result = ldiv(num,denom);
1451
1452   MSVCRT_ldiv_t ret;
1453   ret.quot = result.quot;
1454   ret.rem = result.rem;
1455
1456   return ret;
1457 }
1458 #endif /* ifdef __i386__ */
1459
1460 #ifdef __i386__
1461
1462 /*********************************************************************
1463  *              _adjust_fdiv (MSVCRT.@)
1464  * Used by the MSVC compiler to work around the Pentium FDIV bug.
1465  */
1466 int MSVCRT__adjust_fdiv = 0;
1467
1468 /***********************************************************************
1469  *              _adj_fdiv_m16i (MSVCRT.@)
1470  *
1471  * NOTE
1472  *    I _think_ this function is intended to work around the Pentium
1473  *    fdiv bug.
1474  */
1475 void __stdcall _adj_fdiv_m16i( short arg )
1476 {
1477   TRACE("(): stub\n");
1478 }
1479
1480 /***********************************************************************
1481  *              _adj_fdiv_m32 (MSVCRT.@)
1482  *
1483  * NOTE
1484  *    I _think_ this function is intended to work around the Pentium
1485  *    fdiv bug.
1486  */
1487 void __stdcall _adj_fdiv_m32( unsigned int arg )
1488 {
1489   TRACE("(): stub\n");
1490 }
1491
1492 /***********************************************************************
1493  *              _adj_fdiv_m32i (MSVCRT.@)
1494  *
1495  * NOTE
1496  *    I _think_ this function is intended to work around the Pentium
1497  *    fdiv bug.
1498  */
1499 void __stdcall _adj_fdiv_m32i( int arg )
1500 {
1501   TRACE("(): stub\n");
1502 }
1503
1504 /***********************************************************************
1505  *              _adj_fdiv_m64 (MSVCRT.@)
1506  *
1507  * NOTE
1508  *    I _think_ this function is intended to work around the Pentium
1509  *    fdiv bug.
1510  */
1511 void __stdcall _adj_fdiv_m64( unsigned __int64 arg )
1512 {
1513   TRACE("(): stub\n");
1514 }
1515
1516 /***********************************************************************
1517  *              _adj_fdiv_r (MSVCRT.@)
1518  * FIXME
1519  *    This function is likely to have the wrong number of arguments.
1520  *
1521  * NOTE
1522  *    I _think_ this function is intended to work around the Pentium
1523  *    fdiv bug.
1524  */
1525 void _adj_fdiv_r(void)
1526 {
1527   TRACE("(): stub\n");
1528 }
1529
1530 /***********************************************************************
1531  *              _adj_fdivr_m16i (MSVCRT.@)
1532  *
1533  * NOTE
1534  *    I _think_ this function is intended to work around the Pentium
1535  *    fdiv bug.
1536  */
1537 void __stdcall _adj_fdivr_m16i( short arg )
1538 {
1539   TRACE("(): stub\n");
1540 }
1541
1542 /***********************************************************************
1543  *              _adj_fdivr_m32 (MSVCRT.@)
1544  *
1545  * NOTE
1546  *    I _think_ this function is intended to work around the Pentium
1547  *    fdiv bug.
1548  */
1549 void __stdcall _adj_fdivr_m32( unsigned int arg )
1550 {
1551   TRACE("(): stub\n");
1552 }
1553
1554 /***********************************************************************
1555  *              _adj_fdivr_m32i (MSVCRT.@)
1556  *
1557  * NOTE
1558  *    I _think_ this function is intended to work around the Pentium
1559  *    fdiv bug.
1560  */
1561 void __stdcall _adj_fdivr_m32i( int arg )
1562 {
1563   TRACE("(): stub\n");
1564 }
1565
1566 /***********************************************************************
1567  *              _adj_fdivr_m64 (MSVCRT.@)
1568  *
1569  * NOTE
1570  *    I _think_ this function is intended to work around the Pentium
1571  *    fdiv bug.
1572  */
1573 void __stdcall _adj_fdivr_m64( unsigned __int64 arg )
1574 {
1575   TRACE("(): stub\n");
1576 }
1577
1578 /***********************************************************************
1579  *              _adj_fpatan (MSVCRT.@)
1580  * FIXME
1581  *    This function is likely to have the wrong number of arguments.
1582  *
1583  * NOTE
1584  *    I _think_ this function is intended to work around the Pentium
1585  *    fdiv bug.
1586  */
1587 void _adj_fpatan(void)
1588 {
1589   TRACE("(): stub\n");
1590 }
1591
1592 /***********************************************************************
1593  *              _adj_fprem (MSVCRT.@)
1594  * FIXME
1595  *    This function is likely to have the wrong number of arguments.
1596  *
1597  * NOTE
1598  *    I _think_ this function is intended to work around the Pentium
1599  *    fdiv bug.
1600  */
1601 void _adj_fprem(void)
1602 {
1603   TRACE("(): stub\n");
1604 }
1605
1606 /***********************************************************************
1607  *              _adj_fprem1 (MSVCRT.@)
1608  * FIXME
1609  *    This function is likely to have the wrong number of arguments.
1610  *
1611  * NOTE
1612  *    I _think_ this function is intended to work around the Pentium
1613  *    fdiv bug.
1614  */
1615 void _adj_fprem1(void)
1616 {
1617   TRACE("(): stub\n");
1618 }
1619
1620 /***********************************************************************
1621  *              _adj_fptan (MSVCRT.@)
1622  * FIXME
1623  *    This function is likely to have the wrong number of arguments.
1624  *
1625  * NOTE
1626  *    I _think_ this function is intended to work around the Pentium
1627  *    fdiv bug.
1628  */
1629 void _adj_fptan(void)
1630 {
1631   TRACE("(): stub\n");
1632 }
1633
1634 /***********************************************************************
1635  *              _safe_fdiv (MSVCRT.@)
1636  * FIXME
1637  *    This function is likely to have the wrong number of arguments.
1638  *
1639  * NOTE
1640  *    I _think_ this function is intended to work around the Pentium
1641  *    fdiv bug.
1642  */
1643 void _safe_fdiv(void)
1644 {
1645   TRACE("(): stub\n");
1646 }
1647
1648 /***********************************************************************
1649  *              _safe_fdivr (MSVCRT.@)
1650  * FIXME
1651  *    This function is likely to have the wrong number of arguments.
1652  *
1653  * NOTE
1654  *    I _think_ this function is intended to work around the Pentium
1655  *    fdiv bug.
1656  */
1657 void _safe_fdivr(void)
1658 {
1659   TRACE("(): stub\n");
1660 }
1661
1662 /***********************************************************************
1663  *              _safe_fprem (MSVCRT.@)
1664  * FIXME
1665  *    This function is likely to have the wrong number of arguments.
1666  *
1667  * NOTE
1668  *    I _think_ this function is intended to work around the Pentium
1669  *    fdiv bug.
1670  */
1671 void _safe_fprem(void)
1672 {
1673   TRACE("(): stub\n");
1674 }
1675
1676 /***********************************************************************
1677  *              _safe_fprem1 (MSVCRT.@)
1678  *
1679  * FIXME
1680  *    This function is likely to have the wrong number of arguments.
1681  *
1682  * NOTE
1683  *    I _think_ this function is intended to work around the Pentium
1684  *    fdiv bug.
1685  */
1686 void _safe_fprem1(void)
1687 {
1688   TRACE("(): stub\n");
1689 }
1690
1691 #endif  /* __i386__ */