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/*
IGraph library.
Copyright (C) 2021 The igraph development team <igraph@igraph.org>
This program 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.
This program 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, see <https://www.gnu.org/licenses/>.
*/
#include <igraph.h>
#include "math/safe_intop.h"
#define EXPECT_SUCC(expr) IGRAPH_ASSERT((expr) == IGRAPH_SUCCESS)
#define EXPECT_FAIL(expr) IGRAPH_ASSERT((expr) != IGRAPH_SUCCESS)
int main(void) {
igraph_integer_t res;
igraph_set_error_handler(igraph_error_handler_printignore);
/* Addition */
EXPECT_SUCC(igraph_i_safe_add(1, 2, &res));
EXPECT_SUCC(igraph_i_safe_add(-123, 42, &res));
EXPECT_SUCC(igraph_i_safe_add(-5, -137, &res));
EXPECT_SUCC(igraph_i_safe_add(IGRAPH_INTEGER_MAX-1, 1, &res));
EXPECT_SUCC(igraph_i_safe_add(IGRAPH_INTEGER_MIN+1, -1, &res));
EXPECT_SUCC(igraph_i_safe_add(IGRAPH_INTEGER_MIN, IGRAPH_INTEGER_MAX, &res));
EXPECT_SUCC(igraph_i_safe_add(IGRAPH_INTEGER_MAX/2, IGRAPH_INTEGER_MAX/2, &res));
EXPECT_FAIL(igraph_i_safe_add(IGRAPH_INTEGER_MAX, IGRAPH_INTEGER_MAX, &res));
EXPECT_FAIL(igraph_i_safe_add(IGRAPH_INTEGER_MAX, 1, &res));
EXPECT_FAIL(igraph_i_safe_add(IGRAPH_INTEGER_MIN, -1, &res));
EXPECT_FAIL(igraph_i_safe_add(IGRAPH_INTEGER_MAX/2 + 2, IGRAPH_INTEGER_MAX/2, &res));
/* Multiplication */
EXPECT_SUCC(igraph_i_safe_mult(3, 4, &res));
EXPECT_SUCC(igraph_i_safe_mult(-35, 14, &res));
EXPECT_SUCC(igraph_i_safe_mult(-5, -9, &res));
EXPECT_SUCC(igraph_i_safe_mult(IGRAPH_INTEGER_MAX, 1, &res));
EXPECT_SUCC(igraph_i_safe_mult(1, IGRAPH_INTEGER_MAX, &res));
EXPECT_SUCC(igraph_i_safe_mult(2, IGRAPH_INTEGER_MAX/2, &res));
EXPECT_SUCC(igraph_i_safe_mult(2, IGRAPH_INTEGER_MIN/2, &res));
EXPECT_FAIL(igraph_i_safe_mult(2, IGRAPH_INTEGER_MAX, &res));
EXPECT_FAIL(igraph_i_safe_mult(2, IGRAPH_INTEGER_MIN, &res));
EXPECT_FAIL(igraph_i_safe_mult(IGRAPH_INTEGER_MAX, IGRAPH_INTEGER_MAX, &res));
EXPECT_FAIL(igraph_i_safe_mult(IGRAPH_INTEGER_MAX, IGRAPH_INTEGER_MIN, &res));
EXPECT_FAIL(igraph_i_safe_mult(IGRAPH_INTEGER_MAX/2, 3, &res));
EXPECT_FAIL(igraph_i_safe_mult(IGRAPH_INTEGER_MIN/2, 3, &res));
EXPECT_FAIL(igraph_i_safe_mult(IGRAPH_INTEGER_MAX/2, -3, &res));
EXPECT_FAIL(igraph_i_safe_mult(IGRAPH_INTEGER_MIN/2, -3, &res));
/* The following tests assume that, mathematically, INTEGER_MIN = -INTEGER_MAX - 1 */
EXPECT_SUCC(igraph_i_safe_mult(IGRAPH_INTEGER_MAX, -1, &res));
EXPECT_SUCC(igraph_i_safe_mult(-1, IGRAPH_INTEGER_MAX, &res));
EXPECT_FAIL(igraph_i_safe_mult(-1, IGRAPH_INTEGER_MIN, &res));
EXPECT_FAIL(igraph_i_safe_mult(IGRAPH_INTEGER_MIN, -1, &res));
return 0;
}
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