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#ifndef UTIL_H
#define UTIL_H
#include <stdarg.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdbool.h>
#if defined(__GNUC__) || defined(__clang__)
# define NORETURN __attribute__((__noreturn__))
#else
# define NORETURN
#endif
#if defined(__GNUC__)
# define UNUSED __attribute__((__unused__))
#else
# define UNUSED
#endif
#define N_ENTRIES(x) (sizeof(x) / sizeof(*x))
#define member_size(type, member) sizeof(((type *)(0))->member)
#define TYPEOF(x) __typeof__(x)
#define PACKED __attribute__((__packed__))
#if defined(__GNUC__)
# define FALLTHROUGH __attribute__ ((fallthrough))
#else
# define FALLTHROUGH
#endif
NORETURN void die(const char *format, ...) __attribute__((format (printf, 1, 2)));
NORETURN void die_errno(const char *format, ...) __attribute__((format (printf, 1, 2)));
void err(const char * format, ...) __attribute__((format (printf, 1, 2)));
void err_errno(const char * format, ...) __attribute__((format (printf, 1, 2)));
#define XREALLOC_ARRAY(x, alloc) ((x) = xrealloc((x), (alloc) * sizeof(*(x))))
#define ALLOC_ARRAY(x, n) (malloc((n) * sizeof(*x)))
#define ALIGN_ADDR_MASK(addr, mask) \
((addr + ((mask) - 1)) & ~((mask) - 1))
#define ALIGN_ADDR_16(addr) ALIGN_ADDR_MASK(addr, 0x10)
#define ALIGN_ADDR_32(addr) ALIGN_ADDR_MASK(addr, 0x20)
#define ALIGN_ADDR_64(addr) ALIGN_ADDR_MASK(addr, 0x40)
#define ALIGN_ADDR(addr, bytes) ALIGN_ADDR_MASK(addr, (8ULL*(bytes)))
// Scaling: 0, 24, 66, 140, 269, 495, 890
#define ALLOC_NC(x) (((x)+14)*7/4)
#define AM_RESIZE_ALLOC(buf, sz, cap, item_sz, alloc_nc) \
do { \
TYPEOF(sz) _sz = (sz); \
if((cap) < _sz) { \
void * nb; \
TYPEOF(cap) nc; \
if(_sz < alloc_nc((cap))) { \
nc = alloc_nc((cap)); \
} else { \
nc = _sz; \
} \
nb = realloc((buf), (item_sz) * nc); \
if(nb) { \
(cap) = nc; \
(buf) = nb; \
} else { \
free((buf)); \
(buf) = NULL; \
} \
} \
} while(0)
#define AM_RESIZE(buf, sz, cap) \
AM_RESIZE_ALLOC(buf, sz, cap, sizeof(*buf), ALLOC_NC)
#endif
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