Viewing file:  range.h (1.49 KB) -rw-r--r--
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#ifndef RANGE_H
/* Definitions of helper functions and macros to create expressions
in a specified range. Not all the symbols declared here are
defined. */
#define SIZE_MAX __SIZE_MAX__
#define DIFF_MAX __PTRDIFF_MAX__
#define DIFF_MIN (-DIFF_MAX - 1)
typedef __INT32_TYPE__ int32_t;
typedef __PTRDIFF_TYPE__ ptrdiff_t;
typedef __SIZE_TYPE__ size_t;
static inline ptrdiff_t signed_value (void)
{
extern volatile ptrdiff_t signed_value_source;
return signed_value_source;
}
static inline size_t unsigned_value (void)
{
extern volatile size_t unsigned_value_source;
return unsigned_value_source;
}
static inline ptrdiff_t signed_range (ptrdiff_t min, ptrdiff_t max)
{
ptrdiff_t val = signed_value ();
return val < min || max < val ? min : val;
}
static inline ptrdiff_t signed_anti_range (ptrdiff_t min, ptrdiff_t max)
{
ptrdiff_t val = signed_value ();
return min <= val && val <= max ? min == DIFF_MIN ? max + 1 : min - 1 : val;
}
static inline size_t unsigned_range (size_t min, size_t max)
{
size_t val = unsigned_value ();
return val < min || max < val ? min : val;
}
static inline size_t unsigned_anti_range (size_t min, size_t max)
{
size_t val = unsigned_value ();
return min <= val && val <= max ? min == 0 ? max + 1 : min - 1 : val;
}
#define SR(min, max) signed_range ((min), (max))
#define UR(min, max) unsigned_range ((min), (max))
#define SAR(min, max) signed_anti_range ((min), (max))
#define UAR(min, max) unsigned_anti_range ((min), (max))
#endif /* RANGE_H */
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