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Annotation of OpenXM/src/kan96xx/gmp-2.0.2-ssh-2/mpf/iset.c, Revision 1.1.1.1

1.1       takayama    1: /* mpf_init_set -- Initialize a float and assign it from another float.
                      2:
                      3: Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
                      4:
                      5: This file is part of the GNU MP Library.
                      6:
                      7: The GNU MP Library is free software; you can redistribute it and/or modify
                      8: it under the terms of the GNU Library General Public License as published by
                      9: the Free Software Foundation; either version 2 of the License, or (at your
                     10: option) any later version.
                     11:
                     12: The GNU MP Library is distributed in the hope that it will be useful, but
                     13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
                     15: License for more details.
                     16:
                     17: You should have received a copy of the GNU Library General Public License
                     18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: MA 02111-1307, USA. */
                     21:
                     22: #include "gmp.h"
                     23: #include "gmp-impl.h"
                     24:
                     25: void
                     26: #if __STDC__
                     27: mpf_init_set (mpf_ptr r, mpf_srcptr s)
                     28: #else
                     29: mpf_init_set (r, s)
                     30:      mpf_ptr r;
                     31:      mpf_srcptr s;
                     32: #endif
                     33: {
                     34:   mp_ptr rp, sp;
                     35:   mp_size_t ssize, size;
                     36:   mp_size_t prec;
                     37:
                     38:   prec = __gmp_default_fp_limb_precision;
                     39:   r->_mp_d = (mp_ptr) (*_mp_allocate_func) ((prec + 1) * BYTES_PER_MP_LIMB);
                     40:   r->_mp_prec = prec;
                     41:
                     42:   prec++;              /* lie not to lose precision in assignment */
                     43:   ssize = s->_mp_size;
                     44:   size = ABS (ssize);
                     45:
                     46:   rp = r->_mp_d;
                     47:   sp = s->_mp_d;
                     48:
                     49:   if (size > prec)
                     50:     {
                     51:       sp += size - prec;
                     52:       size = prec;
                     53:     }
                     54:
                     55:   MPN_COPY (rp, sp, size);
                     56:
                     57:   r->_mp_exp = s->_mp_exp;
                     58:   r->_mp_size = ssize >= 0 ? size : -size;
                     59: }