overflow.h File Reference

arithmetic overflow helpers More...

#include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

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Functions
static bool	sadd_overflow (int a, int b, int *res)
static bool	u64add_overflow (uint64_t a, uint64_t b, uint64_t *res)
static bool	u64mul_overflow (uint64_t a, uint64_t b, uint64_t *res)

Detailed Description

Replace this with stdckdint.h when moving to C23.

Definition in file overflow.h.

Function Documentation

sadd_overflow()

static bool sadd_overflow ( int  a, int  b, int *  res  )

inlinestatic

add two integers, checking for overflow

Parameters

a	Operand 1
b	Operand 2
res	[out] Result on success

Returns

True if overflow would occur

Definition at line 22 of file overflow.h.

References NULL.

Referenced by x_cutval().

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u64add_overflow()

static bool u64add_overflow ( uint64_t  a, uint64_t  b, uint64_t *  res  )

inlinestatic

add two 64-bit unsigned integers, checking for overflow

Parameters

a	Operand 1
b	Operand 2
res	[out] Result on success

Returns

True if overflow would occur

Definition at line 51 of file overflow.h.

References NULL.

Referenced by uadd().

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u64mul_overflow()

static bool u64mul_overflow ( uint64_t  a, uint64_t  b, uint64_t *  res  )

inlinestatic

multiply two 64-bit unsigned integers, checking for overflow

Parameters

a	Operand 1
b	Operand 2
res	[out] Result on success

Returns

True if overflow would occur

Definition at line 77 of file overflow.h.

References NULL.

Referenced by umul().

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