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Import gnulib's xalloc_oversized macro

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Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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Daniel P. Berrange
2013-11-12 18:21:49 +00:00
parent 5b5437349a
commit c856b7c623
2 changed files with 16 additions and 0 deletions
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15
libvirt-utils.h
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@ -28,4 +28,19 @@
# define MIN(a,b) (((a) < (b)) ? (a) : (b))
# endif
/* Return 1 if an array of N objects, each of size S, cannot exist due
to size arithmetic overflow. S must be positive and N must be
nonnegative. This is a macro, not a function, so that it
works correctly even when SIZE_MAX < N.
By gnulib convention, SIZE_MAX represents overflow in size
calculations, so the conservative dividend to use here is
SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
However, malloc (SIZE_MAX) fails on all known hosts where
sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
exactly-SIZE_MAX allocations on such hosts; this avoids a test and
branch when S is known to be 1. */
# define xalloc_oversized(n, s) \
((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
#endif /* __LIBVIRT_UTILS_H__ */