nodemcu-firmware/app/libc/c_stddef.h

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#ifndef __c_stddef_h
#define __c_stddef_h
typedef signed int ptrdiff_t;
#if !defined(offsetof)
#define offsetof(s, m) (size_t)&(((s *)0)->m)
#endif
#if !defined(__size_t)
#define __size_t 1
typedef unsigned int size_t; /* others (e.g. <stdio.h>) also define */
/* the unsigned integral type of the result of the sizeof operator. */
#endif
#undef NULL /* others (e.g. <stdio.h>) also define */
#define NULL 0
/* null pointer constant. */
#endif
/* end of c_stddef.h */