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0f9cf6d4d0
For instane CHAR_BIT is an ANSI C macro which should be documented in other places than Ruby (and the definition in this file must work exactly identical to that of standard one). [ci skip]
99 lines
3 KiB
C++
99 lines
3 KiB
C++
#ifndef RUBY_BACKWARD2_LIMITS_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RUBY_BACKWARD2_LIMITS_H
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/**
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
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* implementation details. Don't take them as canon. They could
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* rapidly appear then vanish. The name (path) of this header file
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* is also an implementation detail. Do not expect it to persist
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* at the place it is now. Developers are free to move it anywhere
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* anytime at will.
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* @note To ruby-core: remember that this header can be possibly
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* recursively included from extension libraries written in C++.
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* Do not expect for instance `__VA_ARGS__` is always available.
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* We assume C99 for ruby itself but we don't assume languages of
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* extension libraries. They could be written in C++98.
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* @brief Historical shim for `<limits.h>`.
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*
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* The macros in this header file are obsolescent. Does anyone really need our
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* own definition of `CHAR_BIT` today?
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*/
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#include "ruby/internal/config.h"
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#ifdef HAVE_LIMITS_H
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# include <limits.h>
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#endif
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#include "ruby/backward/2/long_long.h"
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#ifndef LONG_MAX
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# /* assuming 32bit(2's complement) long */
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# define LONG_MAX 2147483647L
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#endif
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#ifndef LONG_MIN
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# define LONG_MIN (-LONG_MAX-1)
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#endif
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#ifndef CHAR_BIT
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# define CHAR_BIT 8
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#endif
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#ifdef LLONG_MAX
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# /* Take that. */
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#elif defined(LONG_LONG_MAX)
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# define LLONG_MAX LONG_LONG_MAX
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#elif defined(_I64_MAX)
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# define LLONG_MAX _I64_MAX
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#else
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# /* assuming 64bit(2's complement) long long */
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# define LLONG_MAX 9223372036854775807LL
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#endif
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#ifdef LLONG_MIN
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# /* Take that. */
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#elif defined(LONG_LONG_MIN)
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# define LLONG_MIN LONG_LONG_MIN
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#elif defined(_I64_MAX)
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# define LLONG_MIN _I64_MIN
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#else
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# define LLONG_MIN (-LLONG_MAX-1)
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#endif
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#ifdef SIZE_MAX
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# /* Take that. */
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#elif SIZEOF_SIZE_T == SIZEOF_LONG_LONG
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# define SIZE_MAX ULLONG_MAX
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# define SIZE_MIN ULLONG_MIN
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#elif SIZEOF_SIZE_T == SIZEOF_LONG
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# define SIZE_MAX ULONG_MAX
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# define SIZE_MIN ULONG_MIN
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#elif SIZEOF_SIZE_T == SIZEOF_INT
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# define SIZE_MAX UINT_MAX
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# define SIZE_MIN UINT_MIN
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#else
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# define SIZE_MAX USHRT_MAX
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# define SIZE_MIN USHRT_MIN
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#endif
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#ifdef SSIZE_MAX
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# /* Take that. */
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#elif SIZEOF_SIZE_T == SIZEOF_LONG_LONG
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# define SSIZE_MAX LLONG_MAX
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# define SSIZE_MIN LLONG_MIN
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#elif SIZEOF_SIZE_T == SIZEOF_LONG
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# define SSIZE_MAX LONG_MAX
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# define SSIZE_MIN LONG_MIN
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#elif SIZEOF_SIZE_T == SIZEOF_INT
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# define SSIZE_MAX INT_MAX
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# define SSIZE_MIN INT_MIN
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#else
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# define SSIZE_MAX SHRT_MAX
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# define SSIZE_MIN SHRT_MIN
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#endif
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#endif /* RUBY_BACKWARD2_LIMITS_H */
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