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/*
* lap.c
*
* Find least annihilating power of a mod m
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the MPI Arbitrary Precision Integer Arithmetic
* library.
*
* The Initial Developer of the Original Code is Michael J. Fromberger.
* Portions created by Michael J. Fromberger are
* Copyright (C) 1998, 1999, 2000 Michael J. Fromberger.
* All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the GPL.
*
* $Id$
*/
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include "mpi.h"
void sig_catch(int ign);
int g_quit = 0;
int main(int argc, char *argv[])
{
mp_int a, m, p, k;
if(argc < 3) {
fprintf(stderr, "Usage: %s <a> <m>\n", argv[0]);
return 1;
}
mp_init(&a);
mp_init(&m);
mp_init(&p);
mp_add_d(&p, 1, &p);
mp_read_radix(&a, argv[1], 10);
mp_read_radix(&m, argv[2], 10);
mp_init_copy(&k, &a);
signal(SIGINT, sig_catch);
signal(SIGHUP, sig_catch);
signal(SIGTERM, sig_catch);
while(mp_cmp(&p, &m) < 0) {
if(g_quit) {
int len;
char *buf;
len = mp_radix_size(&p, 10);
buf = malloc(len);
mp_toradix(&p, buf, 10);
fprintf(stderr, "Terminated at: %s\n", buf);
free(buf);
return 1;
}
if(mp_cmp_d(&k, 1) == 0) {
int len;
char *buf;
len = mp_radix_size(&p, 10);
buf = malloc(len);
mp_toradix(&p, buf, 10);
printf("%s\n", buf);
free(buf);
break;
}
mp_mulmod(&k, &a, &m, &k);
mp_add_d(&p, 1, &p);
}
if(mp_cmp(&p, &m) >= 0)
printf("No annihilating power.\n");
mp_clear(&p);
mp_clear(&m);
mp_clear(&a);
return 0;
}
void sig_catch(int ign)
{
g_quit = 1;
}
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