1/* mpi-cmp.c - MPI functions 2 * Copyright (C) 1998, 1999 Free Software Foundation, Inc. 3 * 4 * This file is part of GnuPG. 5 * 6 * GnuPG is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * GnuPG is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 19 */ 20 21#include "mpi-internal.h" 22 23int mpi_cmp_ui(MPI u, unsigned long v) 24{ 25 mpi_limb_t limb = v; 26 27 mpi_normalize(u); 28 if (!u->nlimbs && !limb) 29 return 0; 30 if (u->sign) 31 return -1; 32 if (u->nlimbs > 1) 33 return 1; 34 35 if (u->d[0] == limb) 36 return 0; 37 else if (u->d[0] > limb) 38 return 1; 39 else 40 return -1; 41} 42EXPORT_SYMBOL_GPL(mpi_cmp_ui); 43 44int mpi_cmp(MPI u, MPI v) 45{ 46 mpi_size_t usize, vsize; 47 int cmp; 48 49 mpi_normalize(u); 50 mpi_normalize(v); 51 usize = u->nlimbs; 52 vsize = v->nlimbs; 53 if (!u->sign && v->sign) 54 return 1; 55 if (u->sign && !v->sign) 56 return -1; 57 if (usize != vsize && !u->sign && !v->sign) 58 return usize - vsize; 59 if (usize != vsize && u->sign && v->sign) 60 return vsize - usize; 61 if (!usize) 62 return 0; 63 cmp = mpihelp_cmp(u->d, v->d, usize); 64 if (u->sign) 65 return -cmp; 66 return cmp; 67} 68EXPORT_SYMBOL_GPL(mpi_cmp); 69