Viewing file:  limits.h (2.99 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
#ifndef RUBY_BACKWARD2_LIMITS_H /*-*-C++-*-vi:se ft=cpp:*/
#define RUBY_BACKWARD2_LIMITS_H
/**
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
* implementation details. Don't take them as canon. They could
* rapidly appear then vanish. The name (path) of this header file
* is also an implementation detail. Do not expect it to persist
* at the place it is now. Developers are free to move it anywhere
* anytime at will.
* @note To ruby-core: remember that this header can be possibly
* recursively included from extension libraries written in C++.
* Do not expect for instance `__VA_ARGS__` is always available.
* We assume C99 for ruby itself but we don't assume languages of
* extension libraries. They could be written in C++98.
* @brief Historical shim for `<limits.h>`.
*
* The macros in this header file are obsolescent. Does anyone really need our
* own definition of `CHAR_BIT` today?
*/
#include "ruby/internal/config.h"
#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
#include "ruby/backward/2/long_long.h"
#ifndef LONG_MAX
# /* assuming 32bit(2's complement) long */
# define LONG_MAX 2147483647L
#endif
#ifndef LONG_MIN
# define LONG_MIN (-LONG_MAX-1)
#endif
#ifndef CHAR_BIT
# define CHAR_BIT 8
#endif
#ifdef LLONG_MAX
# /* Take that. */
#elif defined(LONG_LONG_MAX)
# define LLONG_MAX LONG_LONG_MAX
#elif defined(_I64_MAX)
# define LLONG_MAX _I64_MAX
#else
# /* assuming 64bit(2's complement) long long */
# define LLONG_MAX 9223372036854775807LL
#endif
#ifdef LLONG_MIN
# /* Take that. */
#elif defined(LONG_LONG_MIN)
# define LLONG_MIN LONG_LONG_MIN
#elif defined(_I64_MAX)
# define LLONG_MIN _I64_MIN
#else
# define LLONG_MIN (-LLONG_MAX-1)
#endif
#ifdef SIZE_MAX
# /* Take that. */
#elif SIZEOF_SIZE_T == SIZEOF_LONG_LONG
# define SIZE_MAX ULLONG_MAX
# define SIZE_MIN ULLONG_MIN
#elif SIZEOF_SIZE_T == SIZEOF_LONG
# define SIZE_MAX ULONG_MAX
# define SIZE_MIN ULONG_MIN
#elif SIZEOF_SIZE_T == SIZEOF_INT
# define SIZE_MAX UINT_MAX
# define SIZE_MIN UINT_MIN
#else
# define SIZE_MAX USHRT_MAX
# define SIZE_MIN USHRT_MIN
#endif
#ifdef SSIZE_MAX
# /* Take that. */
#elif SIZEOF_SIZE_T == SIZEOF_LONG_LONG
# define SSIZE_MAX LLONG_MAX
# define SSIZE_MIN LLONG_MIN
#elif SIZEOF_SIZE_T == SIZEOF_LONG
# define SSIZE_MAX LONG_MAX
# define SSIZE_MIN LONG_MIN
#elif SIZEOF_SIZE_T == SIZEOF_INT
# define SSIZE_MAX INT_MAX
# define SSIZE_MIN INT_MIN
#else
# define SSIZE_MAX SHRT_MAX
# define SSIZE_MIN SHRT_MIN
#endif
#endif /* RUBY_BACKWARD2_LIMITS_H */
|