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  1. /*
  2. (C) Copyright IBM Corp. 2009
  3.  
  4. All rights reserved.
  5.  
  6. Redistribution and use in source and binary forms, with or without
  7. modification, are permitted provided that the following conditions are met:
  8.  
  9. * Redistributions of source code must retain the above copyright notice,
  10. this list of conditions and the following disclaimer.
  11. * Redistributions in binary form must reproduce the above copyright
  12. notice, this list of conditions and the following disclaimer in the
  13. documentation and/or other materials provided with the distribution.
  14. * Neither the name of IBM nor the names of its contributors may be
  15. used to endorse or promote products derived from this software without
  16. specific prior written permission.
  17.  
  18. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19. AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20. IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21. ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22. LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23. CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24. SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25. INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26. CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27. ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28. POSSIBILITY OF SUCH DAMAGE.
  29. */
  30.  
  31. #include <stdlib.h>
  32. #include "local.h"
  33. #include "mprec.h"
  34. #undef FLT_ROUNDS
  35.  
  36. #ifdef _HAVE_LONG_DOUBLE
  37.  
  38. #if defined (__x86_64__) || defined (__i386__)
  39. static const int map[] = {
  40.         1,      /* round to nearest */
  41.         3,      /* round to zero */
  42.         2,      /* round to negative infinity */
  43.         0       /* round to positive infinity */
  44. };
  45.  
  46. int
  47. __flt_rounds(void)
  48. {
  49.         int x;
  50.  
  51.         /* Assume that the x87 and the SSE unit agree on the rounding mode. */
  52.         __asm("fnstcw %0" : "=m" (x));
  53.         return (map[(x >> 10) & 0x03]);
  54. }
  55. #define FLT_ROUNDS __flt_rounds()
  56. #else
  57. #define FLT_ROUNDS 0
  58. #endif
  59.  
  60. long double
  61. _strtold_r (struct _reent *ptr, const char *__restrict s00,
  62.             char **__restrict se)
  63. {
  64. #ifdef _LDBL_EQ_DBL
  65.   /* On platforms where long double is as wide as double.  */
  66.   return _strtod_r (ptr, s00, se);
  67. #else
  68.   long double result;
  69.  
  70.   _strtorx_r (ptr, s00, se, FLT_ROUNDS, &result);
  71.   return result;
  72. #endif
  73. }
  74.  
  75. long double
  76. strtold (const char *__restrict s00, char **__restrict se)
  77. {
  78.   return _strtold_r (_REENT, s00, se);
  79. }
  80.  
  81. #endif /* _HAVE_LONG_DOUBLE */
  82.  
  83.