mirror of
https://github.com/matrix-construct/construct
synced 2024-11-29 18:22:50 +01:00
130 lines
4 KiB
C++
130 lines
4 KiB
C++
/**
|
|
* Copyright (C) 2016 Charybdis Development Team
|
|
* Copyright (C) 2016 Jason Volk
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice is present in all copies.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
|
|
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_FMT_H
|
|
|
|
namespace ircd {
|
|
namespace fmt {
|
|
|
|
IRCD_EXCEPTION(ircd::error, error);
|
|
IRCD_EXCEPTION(error, invalid_format);
|
|
IRCD_EXCEPTION(error, invalid_type);
|
|
IRCD_EXCEPTION(error, illegal);
|
|
|
|
//
|
|
// Module API
|
|
//
|
|
constexpr char SPECIFIER
|
|
{
|
|
'%'
|
|
};
|
|
|
|
constexpr char SPECIFIER_TERMINATOR
|
|
{
|
|
'$'
|
|
};
|
|
|
|
using arg = std::tuple<const void *, std::type_index>;
|
|
|
|
// Structural representation of a format specifier
|
|
struct spec
|
|
{
|
|
char sign {'+'};
|
|
ushort width {0};
|
|
string_view name;
|
|
|
|
spec() = default;
|
|
};
|
|
|
|
// A format specifier handler module.
|
|
// This allows a new "%foo" to be defined with custom handling.
|
|
class specifier
|
|
{
|
|
std::set<std::string> names;
|
|
|
|
public:
|
|
virtual bool operator()(char *&out, const size_t &max, const spec &, const arg &) const = 0;
|
|
|
|
specifier(const std::initializer_list<std::string> &names);
|
|
specifier(const std::string &name);
|
|
virtual ~specifier() noexcept;
|
|
};
|
|
|
|
const std::map<string_view, specifier *, std::less<>> &specifiers();
|
|
|
|
//
|
|
// User API
|
|
//
|
|
|
|
// * The arguments are not restricted by stdarg limitations. You can pass a real std::string.
|
|
// * The function participates in the custom protocol-safe ruleset.
|
|
class snprintf
|
|
{
|
|
const char *fstart; // Current running position in the fmtstr
|
|
const char *fstop; // Saved state from the last position
|
|
const char *fend; // past-the-end iterator of the fmtstr
|
|
const char *obeg; // Saved beginning of the output buffer
|
|
const char *oend; // past-the-end iterator of the output buffer
|
|
char *out; // Current running position of the output buffer
|
|
short idx; // Keeps count of the args for better err msgs
|
|
|
|
protected:
|
|
auto finished() const { return !fstart || fstop >= fend; }
|
|
auto remaining() const { return (oend - out) - 1; }
|
|
auto consumed() const { return size_t(out - obeg); }
|
|
auto &buffer() const { return obeg; }
|
|
|
|
void append(const char *const &begin, const char *const &end);
|
|
void argument(const arg &);
|
|
|
|
IRCD_OVERLOAD(internal)
|
|
snprintf(internal_t, char *const &, const size_t &, const char *const &, const va_rtti &);
|
|
|
|
public:
|
|
operator ssize_t() const { return consumed(); }
|
|
|
|
template<class... Args>
|
|
snprintf(char *const &buf,
|
|
const size_t &max,
|
|
const char *const &fmt,
|
|
Args&&... args)
|
|
:snprintf
|
|
{
|
|
internal, buf, max, fmt, va_rtti{std::forward<Args>(args)...}
|
|
}{}
|
|
};
|
|
|
|
struct vsnprintf
|
|
:snprintf
|
|
{
|
|
vsnprintf(char *const &buf,
|
|
const size_t &max,
|
|
const char *const &fmt,
|
|
const va_rtti &ap)
|
|
:snprintf
|
|
{
|
|
internal, buf, max, fmt, ap
|
|
}{}
|
|
};
|
|
|
|
} // namespace fmt
|
|
} // namespace ircd
|