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#ifndef __UTIL_SPRINTF_H
#define __UTIL_SPRINTF_H
#include <stdarg.h>
#include <stdint.h>
#include <builtins.h>
class Console;
namespace Util
{
class ConsoleTraits
{
public:
enum trait { NONE, HEX, DEC, };
};
template <typename _T, ConsoleTraits::trait _S = ConsoleTraits::NONE>
class ConsoleDisplay
{
public:
template <typename _F>
ALWAYS_INLINE
static size_t display(_F& c, _T value) { return 0; };
};
template <ConsoleTraits::trait _S>
class ConsoleDisplay<char*, _S>
{
public:
template <typename _F>
ALWAYS_INLINE
static size_t display(_F& c, char* value)
{
size_t count = 0;
while(*value != '\0')
{
c(*value);
value++;
count++;
}
return count;
}
};
template <>
class ConsoleDisplay<char, ConsoleTraits::NONE>
{
public:
template <typename _F>
ALWAYS_INLINE
static size_t display(_F& c, char value)
{
c(value);
return 1;
}
};
template <typename _T>
class ConsoleDisplay<_T, ConsoleTraits::DEC>
{
public:
template <typename _F>
ALWAYS_INLINE
static size_t display(_F& c, _T value)
{
size_t count = 0;
if (value == 0)
{
c('0'); count++;
}
else if (value < 0)
{
c('-'); count++;
value *= -1;
count += subdisplay(c, value);
}
else
count += subdisplay(c, value);
return count;
}
template <typename _F>
static size_t subdisplay(_F& c, _T value)
{
size_t count = 0;
if (value != 0)
{
count += subdisplay(c, value / 10);
c('0' + (value % 10));
count++;
}
return count;
}
};
template<typename _T>
class ConsoleDisplay<_T, ConsoleTraits::HEX>
{
public:
template <typename _F>
ALWAYS_INLINE
static size_t display(_F& c, _T value)
{
size_t length = sizeof(_T) * 2;
subdisplay(c, value, length);
return length;
}
template <typename _F>
static void subdisplay(_F& c, _T value, size_t length)
{
if (length == 0) return;
subdisplay(c, value / 16, length-1);
char nibble = value % 16;
if (nibble >= 0x0a)
c('A' + (nibble - 0x0a));
else
c('0' + nibble);
}
};
template<typename _F>
size_t vasprintf(_F output_func, const char* fmt_str, va_list& args)
{
size_t count = 0;
bool format = false;
int size = 0;
while('\0' != *fmt_str)
{
if (('%' == *fmt_str) || (format))
switch (*fmt_str)
{
case '%':
{
if (format)
{
count +=
ConsoleDisplay<char>::display(output_func,
'%');
format = false;
}
else
{
format = true;
size = 2;
}
break;
}
case 'c':
{
format = false;
count += ConsoleDisplay<char>
::display(output_func, (char)va_arg(args,int));
break;
}
case 'h':
{
size--;
break;
}
case 'l':
{
size++;
break;
}
case 'z': // size_t or ssize_t
{
size = 4;
break;
}
case 'd': // decimal
{
format = false;
switch(size)
{
case 0:
count += ConsoleDisplay<char,
ConsoleTraits::DEC>
::display(output_func,
(char)va_arg(args,int));
break;
case 1:
count += ConsoleDisplay<short,
ConsoleTraits::DEC>
::display(output_func,
(short)va_arg(args,int));
break;
case 2:
count += ConsoleDisplay<int,
ConsoleTraits::DEC>
::display(output_func,
va_arg(args,int));
break;
case 3:
case 4:
count += ConsoleDisplay<long,
ConsoleTraits::DEC>
::display(output_func,
va_arg(args,long));
break;
}
break;
}
case 'u': // unsigned decimal
{
format = false;
switch(size)
{
case 0:
count += ConsoleDisplay<unsigned char,
ConsoleTraits::DEC>
::display(output_func,
(unsigned char)
va_arg(args,unsigned int));
break;
case 1:
count += ConsoleDisplay<unsigned short,
ConsoleTraits::DEC>
::display(output_func,
(unsigned short)
va_arg(args,unsigned int));
break;
case 2:
count += ConsoleDisplay<unsigned int,
ConsoleTraits::DEC>
::display(output_func,
va_arg(args,unsigned int));
break;
case 3:
case 4:
count += ConsoleDisplay<unsigned long,
ConsoleTraits::DEC>
::display(output_func,
va_arg(args,unsigned long));
break;
}
break;
}
case 'x': // unsigned hex
case 'X':
{
format = false;
switch(size)
{
case 0:
count += ConsoleDisplay<unsigned char,
ConsoleTraits::HEX>
::display(output_func,
(unsigned char)
va_arg(args,unsigned int));
break;
case 1:
count += ConsoleDisplay<unsigned short,
ConsoleTraits::HEX>
::display(output_func,
(unsigned short)
va_arg(args,unsigned int));
break;
case 2:
count += ConsoleDisplay<unsigned int,
ConsoleTraits::HEX>
::display(output_func,
va_arg(args,unsigned int));
break;
case 3:
case 4:
count += ConsoleDisplay<unsigned long,
ConsoleTraits::HEX>
::display(output_func,
va_arg(args,unsigned long));
break;
}
break;
}
case 's': // string
{
format = false;
count += ConsoleDisplay<char*>
::display(output_func,
(char*) va_arg(args,void*));
break;
}
case 'p': // pointer
{
format = false;
count += ConsoleDisplay<char>
::display(output_func,
'0');
count += ConsoleDisplay<char>
::display(output_func,
'x');
count += ConsoleDisplay<unsigned long,
ConsoleTraits::HEX>
::display(output_func,
va_arg(args,unsigned long));
break;
}
}
else
count += ConsoleDisplay<char>::display(output_func, *fmt_str);
fmt_str++;
}
return count;
}
};
#endif
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