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+/*
+ Name: findprime.c
+ Purpose: Find probable primes.
+ Author: M. J. Fromberger <http://spinning-yarns.org/michael/>
+ Info: $Id: findprime.c 635 2008-01-08 18:19:40Z sting $
+
+ Copyright (C) 2002-2008 Michael J. Fromberger, All Rights Reserved.
+
+ Notes:
+ Find the first prime number in sequence starting from the given value.
+ Demonstrates the use of mp_int_find_prime().
+
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+ */
+
+#include <stdio.h>
+
+#include "iprime.h"
+
+int main(int argc, char *argv[])
+{
+ char buf[4096];
+ mpz_t seed;
+ mp_result res;
+
+ if(argc < 2) {
+ fprintf(stderr, "Usage: %s <start-value>\n", argv[0]);
+ return 1;
+ }
+
+ mp_int_init(&seed);
+ if((res = mp_int_read_string(&seed, 10, argv[1])) != MP_OK) {
+ fprintf(stderr, "%s: error reading `%s': %d\n",
+ argv[0], argv[1], res);
+ return 2;
+ }
+
+ if(mp_int_compare_value(&seed, 131) <= 0) {
+ fprintf(stderr, "%s: please enter a start value > 131\n",
+ argv[0]);
+ return 1;
+ }
+
+ if((res = mp_int_find_prime(&seed)) != MP_TRUE) {
+ fprintf(stderr, "%s: error finding prime: %d\n",
+ argv[0], res);
+ return 2;
+ }
+
+ mp_int_to_string(&seed, 10, buf, sizeof(buf));
+ printf("=> %s\n", buf);
+
+ mp_int_clear(&seed);
+
+ return 0;
+}
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