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AK: Generalise 'PrintfImplementation'

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This makes PrintfImplementation usable with any sequence, provided that
a 'next element' function can be written for it.
Does not affect the behaviour of printf() and co.
This commit is contained in:
AnotherTest 2020-08-18 23:07:27 +04:30 • committed by Andreas Kling
parent b62043dbca
commit 72edb33670
Notes: sideshowbarker 2024-07-19 02:45:43 +09:00
2 changed files with 194 additions and 111 deletions
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301
AK/PrintfImplementation.h
View file

@ -32,6 +32,8 @@
#include <AK/Types.h>
#include <stdarg.h>
namespace PrintfImplementation {
static constexpr const char* printf_hex_digits_lower = "0123456789abcdef";
static constexpr const char* printf_hex_digits_upper = "0123456789ABCDEF";
@ -283,169 +285,240 @@ ALWAYS_INLINE int print_signed_number(PutChFunc putch, char*& bufptr, int number
return print_number(putch, bufptr, number, left_pad, zero_pad, field_width);
}
template<typename PutChFunc>
ALWAYS_INLINE int printf_internal(PutChFunc putch, char* buffer, const char*& fmt, va_list ap)
{
const char* p;
struct ModifierState {
bool left_pad { false };
bool zero_pad { false };
bool dot { false };
unsigned field_width { 0 };
bool has_fraction_length { false };
unsigned fraction_length { 6 };
unsigned long_qualifiers { 0 };
bool size_qualifier { false };
bool alternate_form { 0 };
bool always_sign { false };
};
template<typename PutChFunc, typename ArgumentListRefT, template<typename T, typename U = ArgumentListRefT> typename NextArgument>
struct PrintfImpl {
ALWAYS_INLINE PrintfImpl(PutChFunc& putch, char*& bufptr, const int& nwritten)
: m_bufptr(bufptr)
, m_nwritten(nwritten)
, m_putch(putch)
{
}
ALWAYS_INLINE int format_s(const ModifierState& state, ArgumentListRefT ap) const
{
const char* sp = NextArgument<const char*>()(ap);
if (!sp)
sp = "(null)";
return print_string(m_putch, m_bufptr, sp, strlen(sp), state.left_pad, state.field_width, state.dot);
}
ALWAYS_INLINE int format_d(const ModifierState& state, ArgumentListRefT ap) const
{
if (state.long_qualifiers >= 2)
return print_i64(m_putch, m_bufptr, NextArgument<i64>()(ap), state.left_pad, state.zero_pad, state.field_width);
return print_signed_number(m_putch, m_bufptr, NextArgument<int>()(ap), state.left_pad, state.zero_pad, state.field_width, state.always_sign);
}
ALWAYS_INLINE int format_i(const ModifierState& state, ArgumentListRefT ap) const
{
return format_d(state, ap);
}
ALWAYS_INLINE int format_u(const ModifierState& state, ArgumentListRefT ap) const
{
if (state.long_qualifiers >= 2)
return print_u64(m_putch, m_bufptr, NextArgument<u64>()(ap), state.left_pad, state.zero_pad, state.field_width);
return print_number(m_putch, m_bufptr, NextArgument<u32>()(ap), state.left_pad, state.zero_pad, state.field_width);
}
ALWAYS_INLINE int format_Q(const ModifierState& state, ArgumentListRefT ap) const
{
return print_u64(m_putch, m_bufptr, NextArgument<u64>()(ap), state.left_pad, state.zero_pad, state.field_width);
}
ALWAYS_INLINE int format_q(const ModifierState& state, ArgumentListRefT ap) const
{
return print_hex(m_putch, m_bufptr, NextArgument<u64>()(ap), false, false, state.left_pad, state.zero_pad, 16);
}
ALWAYS_INLINE int format_g(const ModifierState& state, ArgumentListRefT ap) const
{
return format_f(state, ap);
}
ALWAYS_INLINE int format_f(const ModifierState& state, ArgumentListRefT ap) const
{
return print_double(m_putch, m_bufptr, NextArgument<double>()(ap), state.left_pad, state.zero_pad, state.field_width, state.fraction_length);
}
ALWAYS_INLINE int format_o(const ModifierState& state, ArgumentListRefT ap) const
{
if (state.alternate_form)
m_putch(m_bufptr, '0');
return (state.alternate_form ? 1 : 0) + print_octal_number(m_putch, m_bufptr, NextArgument<u32>()(ap), state.left_pad, state.zero_pad, state.field_width);
}
ALWAYS_INLINE int format_x(const ModifierState& state, ArgumentListRefT ap) const
{
if (state.long_qualifiers >= 2)
return print_hex(m_putch, m_bufptr, NextArgument<u64>()(ap), false, state.alternate_form, state.left_pad, state.zero_pad, state.field_width);
return print_hex(m_putch, m_bufptr, NextArgument<u64>()(ap), false, state.alternate_form, state.left_pad, state.zero_pad, state.field_width);
}
ALWAYS_INLINE int format_X(const ModifierState& state, ArgumentListRefT ap) const
{
if (state.long_qualifiers >= 2)
return print_hex(m_putch, m_bufptr, NextArgument<u64>()(ap), true, state.alternate_form, state.left_pad, state.zero_pad, state.field_width);
return print_hex(m_putch, m_bufptr, NextArgument<u32>()(ap), true, state.alternate_form, state.left_pad, state.zero_pad, state.field_width);
}
ALWAYS_INLINE int format_n(const ModifierState&, ArgumentListRefT ap) const
{
*NextArgument<int*>()(ap) = m_nwritten;
return 0;
}
ALWAYS_INLINE int format_p(const ModifierState&, ArgumentListRefT ap) const
{
return print_hex(m_putch, m_bufptr, NextArgument<u32>()(ap), false, true, false, true, 8);
}
ALWAYS_INLINE int format_P(const ModifierState&, ArgumentListRefT ap) const
{
return print_hex(m_putch, m_bufptr, NextArgument<u32>()(ap), true, true, false, true, 8);
}
ALWAYS_INLINE int format_percent(const ModifierState&, ArgumentListRefT) const
{
m_putch(m_bufptr, '%');
return 1;
}
ALWAYS_INLINE int format_w(const ModifierState& state, ArgumentListRefT ap) const
{
return print_hex(m_putch, m_bufptr, NextArgument<int>()(ap), false, state.alternate_form, false, true, 4);
}
ALWAYS_INLINE int format_b(const ModifierState& state, ArgumentListRefT ap) const
{
return print_hex(m_putch, m_bufptr, NextArgument<int>()(ap), false, state.alternate_form, false, true, 2);
}
ALWAYS_INLINE int format_c(const ModifierState& state, ArgumentListRefT ap) const
{
char c = NextArgument<int>()(ap);
return print_string(m_putch, m_bufptr, &c, 1, state.left_pad, state.field_width, state.dot);
}
ALWAYS_INLINE int format_unrecognized(char format_op, const char* fmt, const ModifierState&, ArgumentListRefT) const
{
dbg() << "printf_internal: Unimplemented format specifier " << format_op << " (fmt: " << fmt << ")";
return 0;
}
protected:
char*& m_bufptr;
const int& m_nwritten;
PutChFunc& m_putch;
};
template<typename T, typename V>
struct VaArgNextArgument {
ALWAYS_INLINE T operator()(V ap) const
{
return va_arg(ap, T);
}
};
#define PRINTF_IMPL_DELEGATE_TO_IMPL(c) \
case* #c: \
ret += impl.format_##c(state, ap); \
break;
template<typename PutChFunc, template<typename T, typename U, template<typename X, typename Y> typename V> typename Impl = PrintfImpl, typename ArgumentListT = va_list, template<typename T, typename V = decltype(declval<ArgumentListT&>())> typename NextArgument = VaArgNextArgument>
ALWAYS_INLINE int printf_internal(PutChFunc putch, char* buffer, const char*& fmt, ArgumentListT ap)
{
int ret = 0;
char* bufptr = buffer;
for (p = fmt; *p; ++p) {
bool left_pad = false;
bool zero_pad = false;
bool dot = false;
unsigned field_width = 0;
bool has_fraction_length = false;
unsigned fraction_length = 6;
unsigned long_qualifiers = 0;
bool size_qualifier = false;
(void)size_qualifier;
bool alternate_form = 0;
bool always_sign = false;
Impl<PutChFunc, ArgumentListT&, NextArgument> impl { putch, bufptr, ret };
for (const char* p = fmt; *p; ++p) {
ModifierState state;
if (*p == '%' && *(p + 1)) {
one_more:
++p;
if (*p == '.') {
dot = true;
state.dot = true;
if (*(p + 1))
goto one_more;
}
if (*p == '-') {
left_pad = true;
state.left_pad = true;
if (*(p + 1))
goto one_more;
}
if (*p == '+') {
always_sign = true;
state.always_sign = true;
if (*(p + 1))
goto one_more;
}
if (!zero_pad && !field_width && *p == '0') {
zero_pad = true;
if (!state.zero_pad && !state.field_width && *p == '0') {
state.zero_pad = true;
if (*(p + 1))
goto one_more;
}
if (*p >= '0' && *p <= '9') {
if (!dot) {
field_width *= 10;
field_width += *p - '0';
if (!state.dot) {
state.field_width *= 10;
state.field_width += *p - '0';
if (*(p + 1))
goto one_more;
} else {
if (!has_fraction_length) {
has_fraction_length = true;
fraction_length = 0;
if (!state.has_fraction_length) {
state.has_fraction_length = true;
state.fraction_length = 0;
}
fraction_length *= 10;
fraction_length += *p - '0';
state.fraction_length *= 10;
state.fraction_length += *p - '0';
if (*(p + 1))
goto one_more;
}
}
if (*p == '*') {
field_width = va_arg(ap, int);
state.field_width = NextArgument<int>()(ap);
if (*(p + 1))
goto one_more;
}
if (*p == 'l') {
++long_qualifiers;
++state.long_qualifiers;
if (*(p + 1))
goto one_more;
}
if (*p == 'z') {
size_qualifier = true;
state.size_qualifier = true;
if (*(p + 1))
goto one_more;
}
if (*p == '#') {
alternate_form = true;
state.alternate_form = true;
if (*(p + 1))
goto one_more;
}
switch (*p) {
case 's': {
const char* sp = va_arg(ap, const char*);
if (!sp)
sp = "(null)";
ret += print_string(putch, bufptr, sp, strlen(sp), left_pad, field_width, dot);
} break;
case 'd':
case 'i':
if (long_qualifiers >= 2)
ret += print_i64(putch, bufptr, va_arg(ap, i64), left_pad, zero_pad, field_width);
else
ret += print_signed_number(putch, bufptr, va_arg(ap, int), left_pad, zero_pad, field_width, always_sign);
break;
case 'u':
if (long_qualifiers >= 2)
ret += print_u64(putch, bufptr, va_arg(ap, u64), left_pad, zero_pad, field_width);
else
ret += print_number(putch, bufptr, va_arg(ap, u32), left_pad, zero_pad, field_width);
break;
case 'Q':
ret += print_u64(putch, bufptr, va_arg(ap, u64), left_pad, zero_pad, field_width);
break;
case 'q':
ret += print_hex(putch, bufptr, va_arg(ap, u64), false, false, left_pad, zero_pad, 16);
break;
#if !defined(KERNEL)
case 'g':
case 'f':
ret += print_double(putch, bufptr, va_arg(ap, double), left_pad, zero_pad, field_width, fraction_length);
break;
#endif
case 'o':
if (alternate_form) {
putch(bufptr, '0');
++ret;
}
ret += print_octal_number(putch, bufptr, va_arg(ap, u32), left_pad, zero_pad, field_width);
break;
case 'X':
case 'x':
if (long_qualifiers >= 2)
ret += print_hex(putch, bufptr, va_arg(ap, u64), *p == 'X', alternate_form, left_pad, zero_pad, field_width);
else
ret += print_hex(putch, bufptr, va_arg(ap, u32), *p == 'X', alternate_form, left_pad, zero_pad, field_width);
break;
case 'w':
ret += print_hex(putch, bufptr, va_arg(ap, int), false, alternate_form, false, true, 4);
break;
case 'b':
ret += print_hex(putch, bufptr, va_arg(ap, int), false, alternate_form, false, true, 2);
break;
case 'c': {
char c = va_arg(ap, int);
ret += print_string(putch, bufptr, &c, 1, left_pad, field_width, dot);
} break;
case '%':
putch(bufptr, '%');
++ret;
break;
case 'P':
case 'p':
ret += print_hex(putch, bufptr, va_arg(ap, u32), *p == 'P', true, false, true, 8);
break;
case 'n':
*va_arg(ap, int*) = ret;
ret += impl.format_percent(state, ap);
break;
PRINTF_IMPL_DELEGATE_TO_IMPL(P);
PRINTF_IMPL_DELEGATE_TO_IMPL(Q);
PRINTF_IMPL_DELEGATE_TO_IMPL(X);
PRINTF_IMPL_DELEGATE_TO_IMPL(b);
PRINTF_IMPL_DELEGATE_TO_IMPL(c);
PRINTF_IMPL_DELEGATE_TO_IMPL(d);
#ifndef KERNEL
PRINTF_IMPL_DELEGATE_TO_IMPL(f);
PRINTF_IMPL_DELEGATE_TO_IMPL(g);
#endif
PRINTF_IMPL_DELEGATE_TO_IMPL(i);
PRINTF_IMPL_DELEGATE_TO_IMPL(n);
PRINTF_IMPL_DELEGATE_TO_IMPL(o);
PRINTF_IMPL_DELEGATE_TO_IMPL(p);
PRINTF_IMPL_DELEGATE_TO_IMPL(q);
PRINTF_IMPL_DELEGATE_TO_IMPL(s);
PRINTF_IMPL_DELEGATE_TO_IMPL(u);
PRINTF_IMPL_DELEGATE_TO_IMPL(w);
PRINTF_IMPL_DELEGATE_TO_IMPL(x);
default:
dbg() << "printf_internal: Unimplemented format specifier " << *p << " (fmt: " << fmt << ")";
ret += impl.format_unrecognized(*p, fmt, state, ap);
break;
}
} else {
putch(bufptr, *p);
@ -454,3 +527,9 @@ ALWAYS_INLINE int printf_internal(PutChFunc putch, char* buffer, const char*& fm
}
return ret;
}
#undef PRINTF_IMPL_DELEGATE_TO_IMPL
}
using PrintfImplementation::printf_internal;

4
AK/StdLibExtras.h
View file

@ -40,6 +40,9 @@ inline constexpr unsigned round_up_to_power_of_two(unsigned value, unsigned powe
namespace AK {
template<typename T>
auto declval() -> T;
template<typename T, typename SizeType = decltype(sizeof(T)), SizeType N>
constexpr SizeType array_size(T (&)[N])
{
@ -498,6 +501,7 @@ using AK::array_size;
using AK::ceil_div;
using AK::clamp;
using AK::Conditional;
using AK::declval;
using AK::exchange;
using AK::forward;
using AK::IsBaseOf;