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Annotation of OpenXM_contrib/gmp/mpf/random2.c, Revision 1.1.1.1

1.1       maekawa     1: /* mpf_random2 -- Generate a positive random mpf_t of specified size, with
                      2:    long runs of consecutive ones and zeros in the binary representation.
                      3:    Intended for testing of other MP routines.
                      4:
                      5: Copyright (C) 1995, 1996 Free Software Foundation, Inc.
                      6:
                      7: This file is part of the GNU MP Library.
                      8:
                      9: The GNU MP Library is free software; you can redistribute it and/or modify
                     10: it under the terms of the GNU Library General Public License as published by
                     11: the Free Software Foundation; either version 2 of the License, or (at your
                     12: option) any later version.
                     13:
                     14: The GNU MP Library is distributed in the hope that it will be useful, but
                     15: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     16: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
                     17: License for more details.
                     18:
                     19: You should have received a copy of the GNU Library General Public License
                     20: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     21: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     22: MA 02111-1307, USA. */
                     23:
                     24: #include "gmp.h"
                     25: #include "gmp-impl.h"
                     26:
                     27: #if defined (__hpux) || defined (alpha__)  || defined (__svr4__) || defined (__SVR4)
                     28: /* HPUX lacks random().  DEC OSF/1 1.2 random() returns a double.  */
                     29: long mrand48 ();
                     30: static inline long
                     31: random ()
                     32: {
                     33:   return mrand48 ();
                     34: }
                     35: #else
                     36: long random ();
                     37: #endif
                     38:
                     39: void
                     40: #if __STDC__
                     41: mpf_random2 (mpf_ptr x, mp_size_t size, mp_exp_t exp)
                     42: #else
                     43: mpf_random2 (x, size, exp)
                     44:      mpf_ptr x;
                     45:      mp_size_t size;
                     46:      mp_exp_t exp;
                     47: #endif
                     48: {
                     49:   mp_size_t asize;
                     50:   mp_size_t prec = x->_mp_prec;
                     51:
                     52:   asize = ABS (size);
                     53:   if (asize != 0)
                     54:     {
                     55:       if (asize > prec + 1)
                     56:        asize = prec + 1;
                     57:
                     58:       mpn_random2 (x->_mp_d, asize);
                     59:     }
                     60:
                     61:   if (exp != 0)
                     62:     exp = random () % (2 * exp) - exp;
                     63:   x->_mp_exp = asize == 0 ? 0 : exp;
                     64:   x->_mp_size = size < 0 ? -asize : asize;
                     65: }