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Annotation of OpenXM_contrib/gmp/mpf/random2.c, Revision 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: }