int at_or_default(const int *a, size_t n, long i, int fallback)

int safe_div(int a, int b, int *out)

size_t count_steps(unsigned int start)

char *build_path(const char *dir, const char *name)

char *build_label(const char *name, int id)

int copy_frame(char *dst, size_t cap, const char *src, size_t announced)