#include	"sersendf.h"

/** \file sersendf.c
	\brief Simplified printf implementation
*/

#include	<stdarg.h>

#include	"serial.h"
#include	"sermsg.h"


/** \brief Simplified printf
	\param format pointer to output format specifier string stored in FLASH.
	\param ... output data

	Implements only a tiny subset of printf's format specifiers :-

	%[ls][udcx%]

	l - following data is (32 bits)\n
	s - following data is short (8 bits)\n
	none - following data is 16 bits.

	u - unsigned int\n
	d - signed int\n
	q - signed int with decimal before the third digit from the right\n
	c - character\n
	x - hex\n
	% - send a literal % character

	Example:

	\code sersendf_P(PSTR("X:%ld Y:%ld temp:%u.%d flags:%sx Q%su/%su%c\n"), target.X, target.Y, current_temp >> 2, (current_temp & 3) * 25, dda.allflags, mb_head, mb_tail, (queue_full()?'F':(queue_empty()?'E':' '))) \endcode
*/

/**
  va_arg() takes "fully promoted types" only, see example in Linux' va_arg
  man page. This covers platforms >= 16 bits and arguments up to 32 bits.
  64 bit arguments on a 32 bit platform will produce a severe warning.
*/
#if __SIZEOF_INT__ == 2
  #define GET_ARG(T) (va_arg(args, T))
#elif __SIZEOF_INT__ >= 4
  #define GET_ARG(T) ((T)va_arg(args, int))
#endif

void sersendf_P(PGM_P format_P, ...) {
	va_list args;
	va_start(args, format_P);

	uint16_t i = 0;
	uint8_t c = 1, j = 0;
	while ((c = pgm_read_byte(&format_P[i++]))) {
		if (j) {
			switch(c) {
				case 's':
					j = 1;
					break;
				case 'l':
					j = 4;
					break;
				case 'u':
          if (j == 1)
            serwrite_uint8((uint8_t)GET_ARG(uint16_t));
          else if (j == 2)
            serwrite_uint16((uint16_t)GET_ARG(uint16_t));
					else
            serwrite_uint32(GET_ARG(uint32_t));
					j = 0;
					break;
				case 'd':
          if (j == 1)
            serwrite_int8((int8_t)GET_ARG(int16_t));
          else if (j == 2)
            serwrite_int16((uint16_t)GET_ARG(int16_t));
					else
            serwrite_int32(GET_ARG(int32_t));
					j = 0;
					break;
				case 'c':
          serial_writechar((uint8_t)GET_ARG(uint16_t));
					j = 0;
					break;
				case 'x':
					serial_writestr_P(PSTR("0x"));
          if (j == 1)
            serwrite_hex8((uint8_t)GET_ARG(uint16_t));
          else if (j == 2)
            serwrite_hex16((uint16_t)GET_ARG(uint16_t));
					else
            serwrite_hex32(GET_ARG(uint32_t));
					j = 0;
					break;
/*				case 'p':
          serwrite_hex16(GET_ARG(uint16_t));*/
				case 'q':
          serwrite_int32_vf(GET_ARG(uint32_t), 3);
					j = 0;
					break;
				default:
					serial_writechar(c);
					j = 0;
					break;
			}
		}
		else {
			if (c == '%') {
				j = 2;
			}
			else {
				serial_writechar(c);
			}
		}
	}
	va_end(args);
}