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c3ae84bc2a
This adds macros for checked addition, subtraction, and multiplication with semantics similar to the builtins gcc and clang have had for years. Reviewed by: kib, emaste Differential Revision: https://reviews.freebsd.org/D41734 (cherry picked from commite6615b1034) include: Add tests for N2867. Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D41735 (cherry picked from commit4fbb9c43aa) less: We have <stdckdint.h> now. Reviewed by: delphij Differential Revision: https://reviews.freebsd.org/D41736 (cherry picked from commitcb8dd292c7) Approved by: re (gjb)
52 lines
982 B
C
52 lines
982 B
C
/*-
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* Copyright (c) 2023 Dag-Erling Smørgrav
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <limits.h>
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#include <stdckdint.h>
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#include <atf-c.h>
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ATF_TC_WITHOUT_HEAD(ckd_add);
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ATF_TC_BODY(ckd_add, tc)
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{
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int result;
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ATF_CHECK(!ckd_add(&result, INT_MAX, 0));
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ATF_CHECK_EQ(INT_MAX, result);
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ATF_CHECK(ckd_add(&result, INT_MAX, 1));
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ATF_CHECK_EQ(INT_MIN, result);
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}
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ATF_TC_WITHOUT_HEAD(ckd_sub);
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ATF_TC_BODY(ckd_sub, tc)
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{
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int result;
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ATF_CHECK(!ckd_sub(&result, INT_MIN, 0));
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ATF_CHECK_EQ(INT_MIN, result);
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ATF_CHECK(ckd_sub(&result, INT_MIN, 1));
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ATF_CHECK_EQ(INT_MAX, result);
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}
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ATF_TC_WITHOUT_HEAD(ckd_mul);
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ATF_TC_BODY(ckd_mul, tc)
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{
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int result;
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ATF_CHECK(!ckd_mul(&result, INT_MAX / 2, 2));
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ATF_CHECK_EQ(INT_MAX - 1, result);
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ATF_CHECK(ckd_mul(&result, INT_MAX / 2 + 1, 2));
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ATF_CHECK_EQ(INT_MIN, result);
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, ckd_add);
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ATF_TP_ADD_TC(tp, ckd_sub);
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ATF_TP_ADD_TC(tp, ckd_mul);
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return (atf_no_error());
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}
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