libgcobol/cobol-endian.h

/*
 * Copyright (c) 2021-2026 Symas Corporation
 *
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 * modification, are permitted provided that the following conditions are
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 *   notice, this list of conditions and the following disclaimer.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 */

#ifndef COBOL_ENDIAN_H
#define COBOL_ENDIAN_H

/*
   COBOL_TARGET_BIG_ENDIAN answers:
     "Should this code treat COBOL target storage as big-endian?"

   In the compiler front end, that means the GCC target.
   In libgcobol, that means the actual runtime machine/library build.
*/

#if defined(IN_GCC_FRONTEND)

/* Front-end / compiler build.  This is compiler run time,
   but target endianness. */

static inline bool
cobol_target_big_endian()
  {
  return BYTES_BIG_ENDIAN;
  }

#else

/* Runtime library build.  This is target-program run time,
   so it must be decided from the runtime library's build config. */

#if defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
# define COBOL_BIG_ENDIAN 1
# define COBOL_LITTLE_ENDIAN 0
#elif defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define COBOL_BIG_ENDIAN 0
# define COBOL_LITTLE_ENDIAN 1

#elif defined(__BIG_ENDIAN__) || defined(_BIG_ENDIAN)
# define COBOL_BIG_ENDIAN 1
# define COBOL_LITTLE_ENDIAN 0
#elif defined(__LITTLE_ENDIAN__) || defined(_LITTLE_ENDIAN)
# define COBOL_BIG_ENDIAN 0
# define COBOL_LITTLE_ENDIAN 1

#endif

static inline bool
cobol_target_big_endian()
  {
  return COBOL_BIG_ENDIAN != 0;
  }

static inline bool
cobol_target_little_endian()
  {
  return COBOL_BIG_ENDIAN == 0;
  }


#endif

#endif /* COBOL_ENDIAN_H */