1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
|
//------------------------------------------------------------------------------
// GB_size_t_multiply: multiply two size_t and guard against overflow
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// c = a*b but check for overflow
#ifndef GB_SIZE_T_MULTIPLY_H
#define GB_SIZE_T_MULTIPLY_H
GB_STATIC_INLINE bool GB_size_t_multiply // true if ok, false if overflow
(
size_t *c, // c = a*b, or zero if overflow occurs
const size_t a,
const size_t b
)
{
uint64_t x ;
bool ok = GB_uint64_multiply (&x, (uint64_t) a, (uint64_t) b) ;
(*c) = (ok && x <= SIZE_MAX) ? ((size_t) x) : 0 ;
return (ok) ;
}
#endif
|