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ircd: Add pretty IEC unit printing utils.
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2 changed files with 39 additions and 0 deletions
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@ -36,6 +36,9 @@ namespace ircd
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const_buffer a2u(const mutable_buffer &out, const const_buffer &in);
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string_view u2a(const mutable_buffer &out, const const_buffer &in);
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std::string u2a(const const_buffer &in);
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string_view pretty_iec_unit(const mutable_buffer &out, const uint64_t &value);
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std::string pretty_iec_unit(const uint64_t &value);
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}
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namespace ircd
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@ -22,6 +22,42 @@
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// misc util
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//
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std::string
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ircd::pretty_iec_unit(const uint64_t &value)
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{
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return util::string(32, [&value]
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(const mutable_buffer &out)
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{
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return pretty_iec_unit(out, value);
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});
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}
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ircd::string_view
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ircd::pretty_iec_unit(const mutable_buffer &out,
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const uint64_t &value)
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try
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{
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auto pos(0);
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auto v(value);
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for(; v > 1024; v /= 1024, ++pos);
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static const std::array<string_view, 7> unit
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{
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"B", " KiB", "MiB", "GiB", "TiB", "PiB", "EiB"
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};
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return fmt::sprintf
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{
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out, "%lu %s", v, unit.at(pos)
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};
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}
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catch(const std::out_of_range &e)
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{
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return fmt::sprintf
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{
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out, "%lu B", value
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};
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}
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std::string
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ircd::u2a(const const_buffer &in)
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{
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