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internal: Add helper macro for checking multiply and add overflows

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The macro does the two checks together so that it's obvious what we're
checking as doing it in place is really unpleasant.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
This commit is contained in:
Peter Krempa 2024-09-09 16:46:07 +02:00 committed by Pavel Hrdina
parent 3c5839973f
commit 23cb613606
1 changed files with 11 additions and 0 deletions
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11
src/internal.h
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@ -43,6 +43,17 @@
#define VIR_INT_MULTIPLY_OVERFLOW(a,b) (G_UNLIKELY ((b) > 0 && (a) > G_MAXINT / (b)))
/**
* VIR_MULTIPLY_ADD_IS_OVERFLOW:
* @limit: maximum value of data type
* @value: current value
* @multiply: number @value is going to be multiplied by
* @add: number that will be added to @value after multiplication
*/
#define VIR_MULTIPLY_ADD_IS_OVERFLOW(limit, value, multiply, add) \
(G_UNLIKELY(((multiply) > 0 && (value) > (limit) / (multiply)) || \
((limit) - ((value) * (multiply)) < (add))))
/* The library itself is allowed to use deprecated functions /
* variables, so effectively undefine the deprecated attribute
* which would otherwise be defined in libvirt.h.