1 #ifndef SAFECAST_H
2 #define SAFECAST_H
3
4 #include <limits.h>
size2int_chk(size_t v)5 static inline int size2int_chk(size_t v)
6 {
7 if (v > INT_MAX)
8 abort();
9 return (int)(v);
10 }
11
size2int_sat(size_t v)12 static inline int size2int_sat(size_t v)
13 {
14 return (v > INT_MAX) ? INT_MAX : (int)v;
15 }
16
17 /* Compilers can emit warning about increased alignment requirements
18 * when casting pointers. The impact is tricky: on machines where
19 * alignment is just a performance issue (x86,x64,...) this might just
20 * cause a performance penalty. On others, an address error can occur
21 * and the process dies...
22 *
23 * Still, there are many cases where the pointer arithmetic and the
24 * buffer alignment make sure this does not happen. OTOH, the compiler
25 * doesn't know this and still emits warnings.
26 *
27 * The following cast macros are going through void pointers to tell
28 * the compiler that there is no alignment requirement to watch.
29 */
30 #define UA_PTR(ptype,pval) ((ptype *)(void*)(pval))
31 #define UAC_PTR(ptype,pval) ((const ptype *)(const void*)(pval))
32 #define UAV_PTR(ptype,pval) ((volatile ptype *)(volatile void*)(pval))
33
34 #endif
35