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author | Werner Koch <[email protected]> | 1997-11-18 14:06:00 +0000 |
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committer | Werner Koch <[email protected]> | 1997-11-18 14:06:00 +0000 |
commit | 5393dd53c5e06f0458949217317601b2eaed8350 (patch) | |
tree | c4b8d021851c32a611165c5fc215ad88604b5a94 /mpi/mpih-cmp.c | |
parent | New repository initialized by cvs2svn. (diff) | |
download | gnupg-5393dd53c5e06f0458949217317601b2eaed8350.tar.gz gnupg-5393dd53c5e06f0458949217317601b2eaed8350.zip |
initially checkin
Diffstat (limited to 'mpi/mpih-cmp.c')
-rw-r--r-- | mpi/mpih-cmp.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/mpi/mpih-cmp.c b/mpi/mpih-cmp.c new file mode 100644 index 000000000..821c0ce8c --- /dev/null +++ b/mpi/mpih-cmp.c @@ -0,0 +1,53 @@ +/* mpihelp-sub.c - MPI helper functions + * Copyright (c) 1997 by Werner Koch (dd9jn) + * + * This file is part of G10. + * + * G10 is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * G10 is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + */ + +#include <config.h> +#include <stdio.h> +#include <stdlib.h> + +#include "mpi-internal.h" + +/**************** + * Compare OP1_PTR/OP1_SIZE with OP2_PTR/OP2_SIZE. + * There are no restrictions on the relative sizes of + * the two arguments. + * Return 1 if OP1 > OP2, 0 if they are equal, and -1 if OP1 < OP2. + */ +int +mpihelp_cmp( mpi_ptr_t op1_ptr, mpi_ptr_t op2_ptr, mpi_size_t size ) +{ + mpi_size_t i; + mpi_limb_t op1_word, op2_word; + + for( i = size - 1; i >= 0 ; i--) { + op1_word = op1_ptr[i]; + op2_word = op2_ptr[i]; + if( op1_word != op2_word ) + goto diff; + } + return 0; + + diff: + /* This can *not* be simplified to + * op2_word - op2_word + * since that expression might give signed overflow. */ + return (op1_word > op2_word) ? 1 : -1; +} + |