src/include/stddef.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef STDDEF_H
   4 #define STDDEF_H
   5
   6 #include <commonlib/helpers.h>
   7
   8 typedef __PTRDIFF_TYPE__ ptrdiff_t;
   9 typedef __SIZE_TYPE__ size_t;
  10 #define SIZE_MAX __SIZE_MAX__
  11 /* There is a GCC macro for a size_t type, but not
  12  * for a ssize_t type. Below construct tricks GCC
  13  * into making __SIZE_TYPE__ signed.
  14  */
  15 #define unsigned signed
  16 typedef __SIZE_TYPE__ ssize_t;
  17 #undef unsigned
  18
  19 typedef __WCHAR_TYPE__ wchar_t;
  20 typedef __WINT_TYPE__ wint_t;
  21
  22 #if __STDC_VERSION__ >= 202300L
  23 #define NULL nullptr
  24 #else
  25 #define nullptr ((void *)0)
  26 #define NULL ((void *)0)
  27 #endif
  28
  29 /* The devicetree data structures are only mutable in ramstage. All other
  30    stages have a constant devicetree. */
  31 #if !ENV_PAYLOAD_LOADER
  32 #define DEVTREE_EARLY 1
  33 #else
  34 #define DEVTREE_EARLY 0
  35 #endif
  36
  37 #if DEVTREE_EARLY
  38 #define DEVTREE_CONST const
  39 #else
  40 #define DEVTREE_CONST
  41 #endif
  42
  43 /* Provide a pointer to address 0 that thwarts any "accessing this is
  44  * undefined behaviour and do whatever" trickery in compilers.
  45  * Use when you _really_ need to read32(zeroptr) (ie. read address 0).
  46  */
  47 extern char zeroptr[];
  48
  49 #endif /* STDDEF_H */