1 /* mpz_set_f (dest_integer, src_float) -- Assign DEST_INTEGER from SRC_FLOAT. 2 3 Copyright 1996, 2001 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 Lesser General Public License as published by 9 the Free Software Foundation; either version 3 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 Lesser General Public 15 License for more details. 16 17 You should have received a copy of the GNU Lesser General Public License 18 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ 19 20 #include "gmp.h" 21 #include "gmp-impl.h" 22 23 24 void 25 mpz_set_f (mpz_ptr w, mpf_srcptr u) 26 { 27 mp_ptr wp, up; 28 mp_size_t size; 29 mp_exp_t exp; 30 31 /* abs(u)<1 truncates to zero */ 32 exp = EXP (u); 33 if (exp <= 0) 34 { 35 SIZ(w) = 0; 36 return; 37 } 38 39 MPZ_REALLOC (w, exp); 40 wp = PTR(w); 41 up = PTR(u); 42 43 size = SIZ (u); 44 SIZ(w) = (size >= 0 ? exp : -exp); 45 size = ABS (size); 46 47 if (exp > size) 48 { 49 /* pad with low zeros to get a total "exp" many limbs */ 50 mp_size_t zeros = exp - size; 51 MPN_ZERO (wp, zeros); 52 wp += zeros; 53 } 54 else 55 { 56 /* exp<=size, trucate to the high "exp" many limbs */ 57 up += (size - exp); 58 size = exp; 59 } 60 61 MPN_COPY (wp, up, size); 62 } 63