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#ifndef CXXSTDIO_HPP
#define CXXSTDIO_HPP
// cxxstdio.hpp - pass C++ types through scanf/printf
//
// Copyright © 2011-2013 Ben Longbons <b.r.longbons@gmail.com>
//
// This file is part of The Mana World (Athena server)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "sanity.hpp"
#include <cstdarg>
#include <cstdio>
#include "const_array.hpp"
#include "utils2.hpp"
namespace cxxstdio
{
// other implementations of do_vprint or do_vscan are injected by ADL.
inline __attribute__((format(printf, 2, 0)))
int do_vprint(FILE *out, const char *fmt, va_list ap)
{
return vfprintf(out, fmt, ap);
}
inline __attribute__((format(scanf, 2, 0)))
int do_vscan(FILE *in, const char *fmt, va_list ap)
{
return vfscanf(in, fmt, ap);
}
#if 0
inline __attribute__((format(scanf, 2, 0)))
int do_vscan(const char *in, const char *fmt, va_list ap)
{
return vsscanf(in, fmt, ap);
}
#else
inline
int do_vscan(const char *, const char *, va_list) = delete;
#endif
template<class T>
inline __attribute__((format(printf, 2, 3)))
int do_print(T&& t, const char *fmt, ...) throw()
{
int rv;
va_list ap;
va_start(ap, fmt);
rv = do_vprint(std::forward<T>(t), fmt, ap);
va_end(ap);
return rv;
}
template<class T>
inline __attribute__((format(scanf, 2, 3)))
int do_scan(T&& t, const char *fmt, ...) throw()
{
int rv;
va_list ap;
va_start(ap, fmt);
rv = do_vscan(std::forward<T>(t), fmt, ap);
va_end(ap);
return rv;
}
template<class T, typename=typename std::enable_if<!std::is_class<T>::value>::type>
typename remove_enum<T>::type decay_for_printf(T v)
{
typedef typename remove_enum<T>::type repr_type;
return repr_type(v);
}
template<class T, typename=decltype(decay_for_printf(std::declval<T&&>()))>
T&& convert_for_printf(T&& v)
{
return std::forward<T>(v);
}
template<class T, typename = typename std::enable_if<!std::is_enum<T>::value>::type>
T& convert_for_scanf(T& v)
{
return v;
}
#if 0
template<class E>
constexpr
E get_enum_min_value(decltype(E::min_value))
{
return E::min_value;
}
template<class E>
constexpr
E get_enum_min_value(E def)
{
return def;
}
template<class E>
constexpr
E get_enum_max_value(decltype(E::max_value))
{
return E::max_value;
}
template<class E>
constexpr
E get_enum_max_value(E def)
{
return def;
}
#else
template<class E>
constexpr
E get_enum_min_value(E)
{
return E::min_value;
}
template<class E>
constexpr
E get_enum_max_value(E)
{
return E::max_value;
}
#endif
template<class E>
class EnumConverter
{
E& out;
typedef typename underlying_type<E>::type U;
#if 0
constexpr static
U min_value = U(get_enum_min_value<E>(E(std::numeric_limits<U>::min())));
constexpr static
U max_value = U(get_enum_max_value<E>(E(std::numeric_limits<U>::max())));
#else
constexpr static
U min_value = U(get_enum_min_value(E()));
constexpr static
U max_value = U(get_enum_max_value(E()));
#endif
U mid;
public:
EnumConverter(E& e)
: out(e), mid(0)
{}
~EnumConverter()
{
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wtype-limits"
if (min_value <= mid && mid <= max_value)
#pragma GCC diagnostic pop
out = E(mid);
}
U *operator &()
{
return ∣
}
};
template<class T, typename = typename std::enable_if<std::is_enum<T>::value>::type>
EnumConverter<T> convert_for_scanf(T& v)
{
return v;
}
template<class Format>
class PrintFormatter
{
public:
template<class T, class... A>
static
int print(T&& t, A&&... a)
{
constexpr static
const char *print_format = Format::print_format();
return do_print(std::forward<T>(t), print_format,
decay_for_printf(convert_for_printf(std::forward<A>(a)))...);
}
};
template<class Format>
class ScanFormatter
{
public:
template<class T, class... A>
static
int scan(T&& t, A&&... a)
{
constexpr static
const char *scan_format = Format::scan_format();
return do_scan(std::forward<T>(t), scan_format,
&convert_for_scanf(*a)...);
}
};
#define XPRINTF(out, fmt, ...) \
([&]() -> int \
{ \
struct format_impl \
{ \
constexpr static \
const char *print_format() { return fmt; } \
}; \
return cxxstdio::PrintFormatter<format_impl>::print(out, ## __VA_ARGS__); \
}())
#define XSCANF(out, fmt, ...) \
([&]() -> int \
{ \
struct format_impl \
{ \
constexpr static \
const char *scan_format() { return fmt; } \
}; \
return cxxstdio::ScanFormatter<format_impl>::scan(out, ## __VA_ARGS__); \
}())
#define FPRINTF(file, fmt, ...) XPRINTF(no_cast<FILE *>(file), fmt, ## __VA_ARGS__)
#define FSCANF(file, fmt, ...) XSCANF(no_cast<FILE *>(file), fmt, ## __VA_ARGS__)
#define PRINTF(fmt, ...) FPRINTF(stdout, fmt, ## __VA_ARGS__)
#define SPRINTF(str, fmt, ...) XPRINTF(base_cast<FString&>(str), fmt, ## __VA_ARGS__)
#define SNPRINTF(str, n, fmt, ...) XPRINTF(base_cast<VString<n-1>&>(str), fmt, ## __VA_ARGS__)
#define SCANF(fmt, ...) FSCANF(stdin, fmt, ## __VA_ARGS__)
#define SSCANF(str, fmt, ...) XSCANF(/*ZString or compatible*/str, fmt, ## __VA_ARGS__)
#define STRPRINTF(fmt, ...) \
([&]() -> FString \
{ \
FString _out_impl; \
SPRINTF(_out_impl, fmt, ## __VA_ARGS__);\
return _out_impl; \
}())
#define STRNPRINTF(n, fmt, ...) \
([&]() -> VString<n - 1> \
{ \
VString<n - 1> _out_impl; \
SNPRINTF(_out_impl, n, fmt, ## __VA_ARGS__);\
return _out_impl; \
}())
} // namespace cxxstdio
#endif // CXXSTDIO_HPP
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