mirror of
https://github.com/rn10950/RetroZilla.git
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89 lines
1.5 KiB
C
89 lines
1.5 KiB
C
/*
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* lap.c
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*
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* Find least annihilating power of a mod m
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include "mpi.h"
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void sig_catch(int ign);
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int g_quit = 0;
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int main(int argc, char *argv[])
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{
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mp_int a, m, p, k;
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if(argc < 3) {
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fprintf(stderr, "Usage: %s <a> <m>\n", argv[0]);
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return 1;
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}
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mp_init(&a);
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mp_init(&m);
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mp_init(&p);
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mp_add_d(&p, 1, &p);
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mp_read_radix(&a, argv[1], 10);
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mp_read_radix(&m, argv[2], 10);
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mp_init_copy(&k, &a);
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signal(SIGINT, sig_catch);
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#ifndef __OS2__
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signal(SIGHUP, sig_catch);
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#endif
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signal(SIGTERM, sig_catch);
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while(mp_cmp(&p, &m) < 0) {
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if(g_quit) {
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int len;
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char *buf;
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len = mp_radix_size(&p, 10);
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buf = malloc(len);
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mp_toradix(&p, buf, 10);
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fprintf(stderr, "Terminated at: %s\n", buf);
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free(buf);
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return 1;
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}
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if(mp_cmp_d(&k, 1) == 0) {
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int len;
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char *buf;
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len = mp_radix_size(&p, 10);
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buf = malloc(len);
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mp_toradix(&p, buf, 10);
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printf("%s\n", buf);
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free(buf);
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break;
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}
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mp_mulmod(&k, &a, &m, &k);
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mp_add_d(&p, 1, &p);
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}
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if(mp_cmp(&p, &m) >= 0)
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printf("No annihilating power.\n");
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mp_clear(&p);
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mp_clear(&m);
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mp_clear(&a);
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return 0;
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}
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void sig_catch(int ign)
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{
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g_quit = 1;
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}
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