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ircd::fmt: Add the %p format specifier for pointer types.

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This commit is contained in:
Jason Volk 2017-03-17 21:03:15 -07:00
parent 3c38aeb96e
commit d3e5cb7f73
1 changed files with 45 additions and 0 deletions
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45
ircd/fmt.cc
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@ -189,6 +189,17 @@ const char_specifier
"c"s
};
struct pointer_specifier
:specifier
{
bool operator()(char *&out, const size_t &max, const spec &, const arg &val) const override;
using specifier::specifier;
}
const pointer_specifier
{
"p"s
};
} // namespace fmt
} // namespace ircd
@ -335,6 +346,40 @@ catch(const illegal &e)
e.what());
}
bool
fmt::pointer_specifier::operator()(char *&out,
const size_t &max,
const spec &,
const arg &val)
const
{
using karma::ulong_;
using karma::eps;
using karma::maxwidth;
static const auto throw_illegal([]
{
throw illegal("Not a pointer");
});
struct generator
:karma::grammar<char *, uintptr_t()>
{
karma::rule<char *, uintptr_t()> pointer_hex
{
lit("0x") << karma::hex
};
generator(): generator::base_type{pointer_hex} {}
}
static const generator;
const auto &ptr(get<0>(val));
const auto &type(get<1>(val));
const void *const p(*reinterpret_cast<const void *const *>(ptr));
return karma::generate(out, maxwidth(max)[generator] | eps[throw_illegal], uintptr_t(p));
}
bool
fmt::char_specifier::operator()(char *&out,
const size_t &max,