/*

	Copyright 2001, 2002 Georges Menie (www.menie.org)

	stdarg version contributed by Christian Ettinger



    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU Lesser General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    (at your option) any later version.



    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU Lesser General Public License for more details.



    You should have received a copy of the GNU Lesser General Public License

    along with this program; if not, write to the Free Software

    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/



/*

	putchar is the only external dependency for this file,

	if you have a working putchar, leave it commented out.

	If not, uncomment the define below and

	replace outbyte(c) by your own function call.



*/

#include "FreeRTOS.h"

#include <stdarg.h>

#include <stdint.h>



static void printchar(char **str, int c)

{

	if (str) {

		**str = (char)c;

		++(*str);

	}

	else

	{

		/* Output char here. */

	}

}



#define PAD_RIGHT 1

#define PAD_ZERO 2



static int prints(char **out, const char *string, int width, int pad)

{

	register int pc = 0, padchar = ' ';



	if (width > 0) {

		register int len = 0;

		register const char *ptr;

		for (ptr = string; *ptr; ++ptr) ++len;

		if (len >= width) width = 0;

		else width -= len;

		if (pad & PAD_ZERO) padchar = '0';

	}

	if (!(pad & PAD_RIGHT)) {

		for ( ; width > 0; --width) {

			printchar (out, padchar);

			++pc;

		}

	}

	for ( ; *string ; ++string) {

		printchar (out, *string);

		++pc;

	}

	for ( ; width > 0; --width) {

		printchar (out, padchar);

		++pc;

	}



	return pc;

}



/* the following should be enough for 32 bit int */

#define PRINT_BUF_LEN 12



static int printi(char **out, int i, int b, int sg, int width, int pad, int letbase)

{

	char print_buf[PRINT_BUF_LEN];

	register char *s;

	register int t, neg = 0, pc = 0;

	register unsigned int u = (unsigned int)i;



	if (i == 0) {

		print_buf[0] = '0';

		print_buf[1] = '\0';

		return prints (out, print_buf, width, pad);

	}



	if (sg && b == 10 && i < 0) {

		neg = 1;

		u = (unsigned int)-i;

	}



	s = print_buf + PRINT_BUF_LEN-1;

	*s = '\0';



	while (u) {

		t = (unsigned int)u % b;

		if( t >= 10 )

			t += letbase - '0' - 10;

		*--s = (char)(t + '0');

		u /= b;

	}



	if (neg) {

		if( width && (pad & PAD_ZERO) ) {

			printchar (out, '-');

			++pc;

			--width;

		}

		else {

			*--s = '-';

		}

	}



	return pc + prints (out, s, width, pad);

}



static int print( char **out, const char *format, va_list args )

{

	register int width, pad;

	register int pc = 0;

	char scr[2];



	for (; *format != 0; ++format) {

		if (*format == '%') {

			++format;

			width = pad = 0;

			if (*format == '\0') break;

			if (*format == '%') goto out;

			if (*format == '-') {

				++format;

				pad = PAD_RIGHT;

			}

			while (*format == '0') {

				++format;

				pad |= PAD_ZERO;

			}

			for ( ; *format >= '0' && *format <= '9'; ++format) {

				width *= 10;

				width += *format - '0';

			}

			if( *format == 's' ) {

				register char *s = (char *)va_arg( args, int );

				pc += prints (out, s?s:"(null)", width, pad);

				continue;

			}

			if( *format == 'd' || *format == 'i' ) {

				pc += printi (out, va_arg( args, int ), 10, 1, width, pad, 'a');

				continue;

			}

			if( *format == 'x' ) {

				pc += printi (out, va_arg( args, int ), 16, 0, width, pad, 'a');

				continue;

			}

			if( *format == 'X' ) {

				pc += printi (out, va_arg( args, int ), 16, 0, width, pad, 'A');

				continue;

			}

			if( *format == 'u' ) {

				pc += printi (out, va_arg( args, int ), 10, 0, width, pad, 'a');

				continue;

			}

			if( *format == 'c' ) {

				/* char are converted to int then pushed on the stack */

				scr[0] = (char)va_arg( args, int );

				scr[1] = '\0';

				pc += prints (out, scr, width, pad);

				continue;

			}

		}

		else {

		out:

			printchar (out, *format);

			++pc;

		}

	}

	if (out) **out = '\0';

	va_end( args );

	return pc;

}



int printf(const char *format, ...)

{

	va_list args;



	va_start( args, format );

	return print( 0, format, args );

}



int sprintf(char *out, const char *format, ...)

{

	va_list args;



	va_start( args, format );

	return print( &out, format, args );

}





int snprintf( char *buf, unsigned int count, const char *format, ... )

{

	va_list args;



	( void ) count;



	va_start( args, format );

	return print( &buf, format, args );

}



#ifdef TEST_PRINTF

int main(void)

{

	char *ptr = "Hello world!";

	char *np = 0;

	int i = 5;

	unsigned int bs = sizeof(int)*8;

	int mi;

	char buf[80];



	mi = (1 << (bs-1)) + 1;

	printf("%s\n", ptr);

	printf("printf test\n");

	printf("%s is null pointer\n", np);

	printf("%d = 5\n", i);

	printf("%d = - max int\n", mi);

	printf("char %c = 'a'\n", 'a');

	printf("hex %x = ff\n", 0xff);

	printf("hex %02x = 00\n", 0);

	printf("signed %d = unsigned %u = hex %x\n", -3, -3, -3);

	printf("%d %s(s)%", 0, "message");

	printf("\n");

	printf("%d %s(s) with %%\n", 0, "message");

	sprintf(buf, "justif: \"%-10s\"\n", "left"); printf("%s", buf);

	sprintf(buf, "justif: \"%10s\"\n", "right"); printf("%s", buf);

	sprintf(buf, " 3: %04d zero padded\n", 3); printf("%s", buf);

	sprintf(buf, " 3: %-4d left justif.\n", 3); printf("%s", buf);

	sprintf(buf, " 3: %4d right justif.\n", 3); printf("%s", buf);

	sprintf(buf, "-3: %04d zero padded\n", -3); printf("%s", buf);

	sprintf(buf, "-3: %-4d left justif.\n", -3); printf("%s", buf);

	sprintf(buf, "-3: %4d right justif.\n", -3); printf("%s", buf);



	return 0;

}



/*

 * if you compile this file with

 *   gcc -Wall $(YOUR_C_OPTIONS) -DTEST_PRINTF -c printf.c

 * you will get a normal warning:

 *   printf.c:214: warning: spurious trailing `%' in format

 * this line is testing an invalid % at the end of the format string.

 *

 * this should display (on 32bit int machine) :

 *

 * Hello world!

 * printf test

 * (null) is null pointer

 * 5 = 5

 * -2147483647 = - max int

 * char a = 'a'

 * hex ff = ff

 * hex 00 = 00

 * signed -3 = unsigned 4294967293 = hex fffffffd

 * 0 message(s)

 * 0 message(s) with %

 * justif: "left      "

 * justif: "     right"

 *  3: 0003 zero padded

 *  3: 3    left justif.

 *  3:    3 right justif.

 * -3: -003 zero padded

 * -3: -3   left justif.

 * -3:   -3 right justif.

 */



#endif





/* To keep linker happy. */

int	write( int i, char* c, int n)

{

	(void)i;

	(void)n;

	(void)c;

	return 0;

}