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bnoordhuis/uint64_add(.c

Created July 19, 2011 14:05
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uint64_add(.c
#include <stdint.h>
#include <limits.h>
uint64_t uint64_add(uint64_t a, uint64_t b, int* overflow) {
uint64_t c;
if (UINT64_MAX - a >= b) {
*overflow = 0;
return a + b;
}
c = a + b;
*overflow = 1 + (c > a);
return c;
}
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