mirror of
https://github.com/matrix-construct/construct
synced 2024-07-03 09:18:19 +02:00
120 lines
4 KiB
C++
120 lines
4 KiB
C++
/**
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* Copyright (C) 2016 Charybdis Development Team
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* Copyright (C) 2016 Jason Volk
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#define HAVE_IRCD_FMT_H
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#ifdef __cplusplus
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namespace ircd {
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namespace fmt {
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IRCD_EXCEPTION(ircd::error, error);
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IRCD_EXCEPTION(error, invalid_format);
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IRCD_EXCEPTION(error, invalid_type);
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IRCD_EXCEPTION(error, illegal);
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//
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// Module API
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//
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extern const char SPECIFIER;
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extern const char SPECIFIER_TERMINATOR;
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using ptrs = std::vector<const void *>;
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using types = std::vector<std::type_index>;
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using arg = std::tuple<const void *const &, const std::type_index &>;
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// Structural representation of a format specifier
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struct spec
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{
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char sign;
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int width;
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std::string name;
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spec();
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};
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// A format specifier handler module.
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// This allows a new "%foo" to be defined with custom handling.
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class specifier
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{
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std::vector<std::string> names;
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public:
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virtual bool operator()(char *&out, const size_t &max, const spec &, const arg &) const = 0;
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specifier(const std::initializer_list<std::string> &names);
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specifier(const std::string &name);
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virtual ~specifier() noexcept;
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};
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const std::map<std::string, specifier *> &specifiers();
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//
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// User API
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//
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// * The arguments are not restricted by stdarg limitations. You can pass a real std::string.
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// * The function participates in the custom protocol-safe ruleset.
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class snprintf
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{
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const char *fstart; // Current running position in the fmtstr
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const char *fstop; // Saved state from the last position
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const char *fend; // past-the-end iterator of the fmtstr
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const char *obeg; // Saved beginning of the output buffer
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const char *oend; // past-the-end iterator of the output buffer
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char *out; // Current running position of the output buffer
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short idx; // Keeps count of the args for better err msgs
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protected:
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auto finished() const { return !fstart || fstop >= fend; }
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auto remaining() const { return (oend - out) - 1; }
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auto consumed() const { return size_t(out - obeg); }
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auto &buffer() const { return obeg; }
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void append(const char *const &begin, const char *const &end);
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void argument(const arg &);
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IRCD_OVERLOAD(internal)
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snprintf(internal_t, char *const &, const size_t &, const char *const &, const ptrs &, const types &);
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public:
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operator ssize_t() const { return consumed(); }
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template<class... A>
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snprintf(char *const &buf, const size_t &max, const char *const &fmt, A&&... args);
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};
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template<class... Args>
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snprintf::snprintf(char *const &buf,
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const size_t &max,
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const char *const &fmt,
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Args&&... args)
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:snprintf
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{
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internal, buf, max, fmt, ptrs{std::addressof(args)...}, types{typeid(Args)...}
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}
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{
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}
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} // namespace fmt
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} // namespace ircd
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#endif // __cplusplus
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