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 23 int mpi_cmp_ui(MPI u, unsigned long v) 24 { 25 mpi_limb_t limb = v; 26 27 mpi_normalize(u); 28 if (u->nlimbs == 0) { 29 if (v == 0) 30 return 0; 31 else 32 return -1; 33 } 34 if (u->sign) 35 return -1; 36 if (u->nlimbs > 1) 37 return 1; 38 39 if (u->d[0] == limb) 40 return 0; 41 else if (u->d[0] > limb) 42 return 1; 43 else 44 return -1; 45 } 46 EXPORT_SYMBOL_GPL(mpi_cmp_ui); 47 48 int mpi_cmp(MPI u, MPI v) 49 { 50 mpi_size_t usize, vsize; 51 int cmp; 52 53 mpi_normalize(u); 54 mpi_normalize(v); 55 usize = u->nlimbs; 56 vsize = v->nlimbs; 57 if (!u->sign && v->sign) 58 return 1; 59 if (u->sign && !v->sign) 60 return -1; 61 if (usize != vsize && !u->sign && !v->sign) 62 return usize - vsize; 63 if (usize != vsize && u->sign && v->sign) 64 return vsize - usize; 65 if (!usize) 66 return 0; 67 cmp = mpihelp_cmp(u->d, v->d, usize); 68 if (u->sign) 69 return -cmp; 70 return cmp; 71 } 72 EXPORT_SYMBOL_GPL(mpi_cmp); 73