3311ff84ea
ntp 4.2.8p5 Reviewed by: cy, roberto Relnotes: yes Differential Revision: https://reviews.freebsd.org/D4828
35 lines
1.0 KiB
C
35 lines
1.0 KiB
C
#ifndef SAFECAST_H
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#define SAFECAST_H
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#include <limits.h>
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static inline int size2int_chk(size_t v)
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{
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if (v > INT_MAX)
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abort();
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return (int)(v);
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}
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static inline int size2int_sat(size_t v)
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{
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return (v > INT_MAX) ? INT_MAX : (int)v;
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}
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/* Compilers can emit warning about increased alignment requirements
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* when casting pointers. The impact is tricky: on machines where
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* alignment is just a performance issue (x86,x64,...) this might just
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* cause a performance penalty. On others, an address error can occur
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* and the process dies...
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*
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* Still, there are many cases where the pointer arithmetic and the
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* buffer alignment make sure this does not happen. OTOH, the compiler
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* doesn't know this and still emits warnings.
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*
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* The following cast macros are going through void pointers to tell
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* the compiler that there is no alignment requirement to watch.
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*/
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#define UA_PTR(ptype,pval) ((ptype *)(void*)(pval))
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#define UAC_PTR(ptype,pval) ((const ptype *)(const void*)(pval))
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#define UAV_PTR(ptype,pval) ((volatile ptype *)(volatile void*)(pval))
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#endif
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