NAME

KS_i32_add_overflow, KS_i32_sub_overflow, KS_i32_mul_overflow, KS_i64_add_overflow, KS_i64_sub_overflow, KS_i64_mul_overflow, KS_u32_add_overflow, KS_u32_sub_overflow, KS_u32_mul_overflow, KS_u64_add_overflow, KS_u64_sub_overflow, KS_u64_mul_overflow, KS_size_add_overflow, KS_size_sub_overflow, KS_size_mul_overflow — overflow safe arithmetic functions

SYNOPSIS

#include <libks/arithmetic.h>

int
KS_i32_add_overflow(int32_t a, int32_t b, int32_t *c);

int
KS_i32_sub_overflow(int32_t a, int32_t b, int32_t *c);

int
KS_i32_mul_overflow(int32_t a, int32_t b, int32_t *c);

int
KS_i64_add_overflow(int64_t a, int64_t b, int64_t *c);

int
KS_i64_sub_overflow(int64_t a, int64_t b, int64_t *c);

int
KS_i64_mul_overflow(int64_t a, int64_t b, int64_t *c);

int
KS_u32_add_overflow(uint32_t a, uint32_t b, uint32_t *c);

int
KS_u32_sub_overflow(uint32_t a, uint32_t b, uint32_t *c);

int
KS_u32_mul_overflow(uint32_t a, uint32_t b, uint32_t *c);

int
KS_u64_add_overflow(uint64_t a, uint64_t b, uint64_t *c);

int
KS_u64_sub_overflow(uint64_t a, uint64_t b, uint64_t *c);

int
KS_u64_mul_overflow(uint64_t a, uint64_t b, uint64_t *c);

int
KS_size_add_overflow(size_t a, size_t b, size_t *c);

int
KS_size_sub_overflow(size_t a, size_t b, size_t *c);

int
KS_size_mul_overflow(size_t a, size_t b, size_t *c);

DESCRIPTION

The arithmetic functions allow performing basic arithmetic operations and detect whether such operations would overflow.

The KS_i32_add_overflow(), KS_i64_add_overflow(), KS_u32_add_overflow(), KS_u64_add_overflow(), and KS_size_add_overflow() functions adds b to a and stores the resulting sum in c.

The KS_i32_sub_overflow(), KS_i64_sub_overflow(), KS_u32_sub_overflow(), KS_u64_sub_overflow() and KS_size_sub_overflow() functions subtracts b from a and stores the resulting sum in c.

The KS_i32_mul_overflow(), KS_i64_mul_overflow(), KS_u32_mul_overflow(), KS_u64_mul_overflow() and KS_size_mul_overflow() functions multiplies a and b and stores the resulting product in c.

RETURN VALUES

All functions returns non-zero if the corresponding arithmetic operation would overflow and zero otherwise.

AUTHORS

Anton Lindqvist <anton@basename.se>