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ircd::fmt: Add lowercase hex specifier.

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This commit is contained in:
Jason Volk 2017-04-06 18:34:44 -07:00
parent 39ab4d1c68
commit cd7d86b699
1 changed files with 63 additions and 0 deletions
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63
ircd/fmt.cc
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@ -178,6 +178,31 @@ const unsigned_specifier
{ "u"s, "lu"s, "zu"s }
};
struct hex_lowercase_specifier
:specifier
{
static const std::tuple
<
bool,
char, unsigned char,
short, unsigned short,
int, unsigned int,
long, unsigned long
>
types;
bool operator()(char *&out, const size_t &max, const spec &, const arg &val) const override;
using specifier::specifier;
}
const hex_lowercase_specifier
{
{ "x"s, "lx"s }
};
decltype(hex_lowercase_specifier::types)
hex_lowercase_specifier::types
{};
decltype(unsigned_specifier::types)
unsigned_specifier::types
{};
@ -573,6 +598,44 @@ const
});
}
bool
fmt::hex_lowercase_specifier::operator()(char *&out,
const size_t &max,
const spec &s,
const arg &val)
const
{
static const auto throw_illegal([]
{
throw illegal("Failed to print hexadecimal value");
});
const auto closure([&](const uint &integer)
{
using karma::maxwidth;
struct generator
:karma::grammar<char *, uint()>
{
karma::rule<char *, uint()> rule
{
karma::lower[karma::hex]
,"unsigned lowercase hexadecimal"
};
generator(): generator::base_type{rule} {}
}
static const generator;
return karma::generate(out, maxwidth(max)[generator] | eps[throw_illegal], integer);
});
return !until(types, [&](auto type)
{
return !visit_type<decltype(type)>(val, closure);
});
}
bool
fmt::float_specifier::operator()(char *&out,
const size_t &max,