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halloc: Cast the offsetof macro to ptrdiff_t before negating

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This gets rid of the warning
"C4146: unary minus applied to unsigned type, result still unsigned"
with visual c++.

Change-Id: I6eb24da983136d798221db4d3a5f50dc2857a03b
This commit is contained in:
Martin Storsjo 2013-05-19 12:54:23 +03:00
parent ec34afd1b0
commit bf8c620778
1 changed files with 1 additions and 1 deletions
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2
nestegg/halloc/src/macros.h
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@ -20,7 +20,7 @@
/*
restore pointer to the structure by a pointer to its field
*/
#define structof(p,t,f) ((t*)(- offsetof(t,f) + (char*)(p)))
#define structof(p,t,f) ((t*)(- (ptrdiff_t) offsetof(t,f) + (char*)(p)))
/*
* redefine for the target compiler