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struct list {
struct list *prev, *next;
};
struct array {
void *val;
size_t len, cap;
};
extern char *argv0;
#define LEN(a) (sizeof(a) / sizeof((a)[0]))
#define ALIGNUP(x, n) (((x) + (n) - 1) & ~((n) - 1))
void warn(const char *, ...);
_Noreturn void fatal(const char *fmt, ...);
void *reallocarray(void *, size_t, size_t);
void *xreallocarray(void *, size_t, size_t);
void *xmalloc(size_t);
char *progname(char *, char *);
void listinsert(struct list *, struct list *);
void listinsertlist(struct list *, struct list *);
void listremove(struct list *);
#define listelement(list, type, member) (type *)((char *)list - offsetof(type, member))
void *arrayadd(struct array *, size_t);
void arrayaddptr(struct array *, void *);
void arrayaddbuf(struct array *, const void *, size_t);
#define arrayforeach(a, m) for (m = (a)->val; m != (void *)((char *)(a)->val + (a)->len); ++m)
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