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ircd::fmt: Add hex uppercase specifier.

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This commit is contained in:
Jason Volk 2019-05-01 17:38:11 -07:00
parent 1a266a0651
commit 643bb62c6e
1 changed files with 97 additions and 0 deletions
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97
ircd/fmt.cc
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@ -33,6 +33,7 @@ __attribute__((visibility("hidden")))
struct signed_specifier extern const signed_specifier;
struct unsigned_specifier extern const unsigned_specifier;
struct float_specifier extern const float_specifier;
struct hex_uppercase_specifier extern const hex_uppercase_specifier;
struct hex_lowercase_specifier extern const hex_lowercase_specifier;
struct pointer_specifier extern const pointer_specifier;
struct string_specifier extern const string_specifier;
@ -257,6 +258,31 @@ const ircd::fmt::hex_lowercase_specifier
decltype(ircd::fmt::hex_lowercase_specifier::types)
ircd::fmt::hex_lowercase_specifier::types;
struct ircd::fmt::hex_uppercase_specifier
:specifier
{
static const std::tuple
<
bool,
char, unsigned char,
short, unsigned short,
int, unsigned int,
long, unsigned long,
long long, unsigned long long
>
types;
bool operator()(char *&out, const size_t &max, const spec &, const arg &val) const override;
using specifier::specifier;
}
const ircd::fmt::hex_uppercase_specifier
{
{ "X"s, "lX"s }
};
decltype(ircd::fmt::hex_uppercase_specifier::types)
ircd::fmt::hex_uppercase_specifier::types;
decltype(ircd::fmt::unsigned_specifier::types)
ircd::fmt::unsigned_specifier::types;
@ -863,6 +889,77 @@ const
});
}
bool
ircd::fmt::hex_uppercase_specifier::operator()(char *&out,
const size_t &max,
const spec &spec,
const arg &val)
const
{
static const auto throw_illegal([]
{
throw illegal("Failed to print hexadecimal value");
});
const auto closure([&](const ulong &integer)
{
using karma::maxwidth;
struct generator
:karma::grammar<char *, ulong()>
{
karma::rule<char *, ulong()> rule
{
karma::upper[karma::hex]
,"unsigned uppercase hexadecimal"
};
_r1_type width;
_r2_type pad;
karma::rule<char *, ulong(ushort, char)> aligned_left
{
karma::left_align(width, pad)[rule]
,"left aligned"
};
karma::rule<char *, ulong(ushort, char)> aligned_right
{
karma::right_align(width, pad)[rule]
,"right aligned"
};
karma::rule<char *, ulong(ushort, char)> aligned_center
{
karma::center(width, pad)[rule]
,"center aligned"
};
generator(): generator::base_type{rule} {}
}
static const generator;
const auto &mw(maxwidth(max));
static const auto &ep(eps[throw_illegal]);
if(!spec.width)
return karma::generate(out, mw[generator] | ep, integer);
if(spec.sign == '-')
{
const auto &g(generator.aligned_left(spec.width, spec.pad));
return karma::generate(out, mw[g] | ep, integer);
}
const auto &g(generator.aligned_right(spec.width, spec.pad));
return karma::generate(out, mw[g] | ep, integer);
});
return !until(types, [&](auto type)
{
return !visit_type<decltype(type)>(val, closure);
});
}
//TODO: note long double is narrowed to double for now otherwise
//TODO: valgrind loops somewhere in here and eats all the system's RAM.
bool