LibStringFormat.hpp

//------------------------------------------------------------------------------
//This file is part of embKernel. 
//See license.txt for the full license governing this code.
//------------------------------------------------------------------------------

#ifndef LIB_STRING_FORMAT_HPP_
#define LIB_STRING_FORMAT_HPP_

#include <stdarg.h>


class LibStringFormat {
private:
    typedef union {
        struct {
            int leftJustify :1;
            int forceSign :1;
            int forceSpace :1;
            int sharp :1;
            int leftPadWith0 :1;
            //Internals
            int isNegative :1;
            int isLowerCase :1;
        } bits;
        int value;
    } FLAGS;

    enum {
        LENGTH_HALF,
        LENGTH_LONG,
        LENGTH_DOUBLE
    };

    typedef struct {
        FLAGS flags;
        int width;
        int precision;
        int length;
        unsigned int base;
    } FORMAT_PARAMETERS;

    static const char HEX_CHARS_LOWER_CASE[];
    static const char HEX_CHARS_UPPER_CASE[];

public:
    static int printf(class LibStreamOut& stream, const char* format, ...) __attribute__ ((format (printf, 2, 3)));
    static int vprintf(class LibStreamOut& stream, const char* format, va_list args);

private:
    static const char* parseFlags(const char* format, FLAGS& flags);
    static const char* parseWidth(const char* format, int& width);
    static const char* parsePrecision(const char* format, int& precision);
    static const char* parseLength(const char* format, int& length);

    static int writeChar(class LibStreamOut& stream, const char c, const FORMAT_PARAMETERS& parameters);
    static int writeNaturalNumber(class LibStreamOut& stream, unsigned int value, const FORMAT_PARAMETERS& parameters);
    static int writeFloat(class LibStreamOut& stream, double value, FORMAT_PARAMETERS& parameters);
    static int writeString(class LibStreamOut& stream, const char* string, const FORMAT_PARAMETERS& parameters);
    static int writePad(class LibStreamOut& stream, const char c, int& size);
};

#endif /* LIB_STRING_FORMAT_HPP_ */