Return to set_f.c CVS log

Up to [local] / OpenXM_contrib / gmp / mpz

Annotation of OpenXM_contrib/gmp/mpz/set_f.c, Revision 1.1.1.1

1.1       maekawa     1: /* mpz_set_f (dest_integer, src_float) -- Assign DEST_INTEGER from SRC_FLOAT.
                      2:
                      3: Copyright (C) 1996 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: mpz_set_f (mpz_ptr w, mpf_srcptr u)
                     28: #else
                     29: mpz_set_f (w, u)
                     30:      mpz_ptr w;
                     31:      mpf_srcptr u;
                     32: #endif
                     33: {
                     34:   mp_ptr wp, up;
                     35:   mp_size_t usize, size;
                     36:   mp_exp_t exp;
                     37:
                     38:   usize = SIZ (u);
                     39:   size = ABS (usize);
                     40:   exp = EXP (u);
                     41:
                     42:   if (w->_mp_alloc < exp)
                     43:     _mpz_realloc (w, exp);
                     44:
                     45:   wp = w->_mp_d;
                     46:   up = u->_mp_d;
                     47:
                     48:   if (exp <= 0)
                     49:     {
                     50:       SIZ (w) = 0;
                     51:       return;
                     52:     }
                     53:   if (exp < size)
                     54:     {
                     55:       MPN_COPY (wp, up + size - exp, exp);
                     56:     }
                     57:   else
                     58:     {
                     59:       MPN_ZERO (wp, exp - size);
                     60:       MPN_COPY (wp + exp - size, up, size);
                     61:     }
                     62:
                     63:   w->_mp_size = usize >= 0 ? exp : -exp;
                     64: }