diff options
Diffstat (limited to 'include/ruby/backward/2/limits.h')
| -rw-r--r-- | include/ruby/backward/2/limits.h | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/include/ruby/backward/2/limits.h b/include/ruby/backward/2/limits.h new file mode 100644 index 0000000000..28eb1596a9 --- /dev/null +++ b/include/ruby/backward/2/limits.h @@ -0,0 +1,96 @@ +/** \noop-*-C++-*-vi:ft=cpp + * @file + * @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 `RUBY3` or `ruby3` 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/3/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 |