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#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 */