freertos/Demo/arch/clib.c

/*
    FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
    All rights reserved

    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    This file is part of the FreeRTOS distribution and was contributed
    to the project by Technolution B.V. (www.technolution.nl,
    freertos-riscv@technolution.eu) under the terms of the FreeRTOS
    contributors license.

    FreeRTOS is free software; you can redistribute it and/or modify it under
    the terms of the GNU General Public License (version 2) as published by the
    Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.

    ***************************************************************************
    >>!   NOTE: The modification to the GPL is included to allow you to     !<<
    >>!   distribute a combined work that includes FreeRTOS without being   !<<
    >>!   obliged to provide the source code for proprietary components     !<<
    >>!   outside of the FreeRTOS kernel.                                   !<<
    ***************************************************************************

    FreeRTOS 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.  Full license text is available on the following
    link: http://www.freertos.org/a00114.html

    ***************************************************************************
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    ***************************************************************************

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    1 tab == 4 spaces!
*/

#include <stdarg.h>
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <limits.h>
#include "clib.h""
#define TEST_COM_BASE ((volatile uint32_t*)(0xF00FFF00))
#define EXIT(code) TEST_COM_BASE[8] = code
#define static_assert(cond) switch(0) { case 0: case !!(long)(cond): ; }

/* Writes char to frontend. */
#undef putchar
int putchar(int ch)
{
	// static char buf[64] __attribute__((aligned(64)));
	// static int buflen = 0;

	// buf[buflen++] = ch;

	// if (ch == '\n' || buflen == sizeof(buf)) {
	// 	char* bufPtr = buf;
	// 	while(buflen != 0){
	// 		TEST_COM_BASE[0] = *(bufPtr++);  //TODO !!!!
	// 		buflen--;
	// 	}
	// }

	// return 0;
}
/*-----------------------------------------------------------*/

/* Writes number to putchar. */
static inline void printnum(void (*putch)(int, void**), void **putdat,
		unsigned long long num, unsigned base, int width, int padc)
{
	unsigned digs[sizeof(num) * CHAR_BIT];
	int pos = 0;

	for(;;) {
		digs[pos++] = num % base;
		if (num < base)
			break;
		num /= base;
	}

	while (width-- > pos){
		putch(padc, putdat);
	}

	while (pos-- > 0){
		putch(digs[pos] + (digs[pos] >= 10 ? 'a' - 10 : '0'), putdat);
	}
}
/*-----------------------------------------------------------*/

/* Returns unsigned integer from argument list. */
static unsigned long long getuint(va_list *ap, int lflag)
{
	if (lflag >= 2) {
		return va_arg(*ap, unsigned long long);
	} else if (lflag) {
		return va_arg(*ap, unsigned long);
	} else {
		return va_arg(*ap, unsigned int);
	}
}
/*-----------------------------------------------------------*/

/* Returns signed integer from argument list. */
static long long getint(va_list *ap, int lflag)
{
	if (lflag >= 2) {
			return va_arg(*ap, long long);
	} else if (lflag) {
			return va_arg(*ap, long);
	} else {
			return va_arg(*ap, int);
	}
}
/*-----------------------------------------------------------*/

/* Format and print a string. */
static void vFormatPrintString(void (*putch)(int, void**), void **putdat,
			const char *fmt, va_list ap)
{
	register const char* p;
	const char* last_fmt;
	register int ch;
	unsigned long long num;
	int base, lflag, width, precision;
	char padc;

	while (1) {
		while ((ch = *(unsigned char *) fmt) != '%') {
			if (ch == '\0')
				return;
			fmt++;
			putch(ch, putdat);
		}
		fmt++;

		// Process a %-escape sequence
		last_fmt = fmt;
		padc = ' ';
		width = -1;
		precision = -1;
		lflag = 0;
		reswitch: switch (ch = *(unsigned char *) fmt++) {

			/* flag to pad on the right */
			case '-':
				padc = '-';
				goto reswitch;

				/* flag to pad with 0's instead of spaces */
			case '0':
				padc = '0';
				goto reswitch;

				/* width field */
			case '1':
			case '2':
			case '3':
			case '4':
			case '5':
			case '6':
			case '7':
			case '8':
			case '9':
				for (precision = 0;; ++fmt) {
					precision = precision * 10 + ch - '0';
					ch = *fmt;
					if (ch < '0' || ch > '9')
						break;
				}
				goto process_precision;

			case '*':
				precision = va_arg(ap, int);
				goto process_precision;

			case '.':
				if (width < 0)
					width = 0;
				goto reswitch;

			case '#':
				goto reswitch;

				process_precision: if (width < 0)
					width = precision, precision = -1;
				goto reswitch;

				/* long flag (doubled for long long) */
			case 'l':
				lflag++;
				goto reswitch;

				/* character */
			case 'c':
				putch(va_arg(ap, int), putdat);
				break;

				/* string */
			case 's':
				if ((p = va_arg(ap, char *)) == NULL)
					p = "(null)";
				if (width > 0 && padc != '-')
					for (width -= strnlen(p, precision); width > 0; width--)
						putch(padc, putdat);
				for (; (ch = *p) != '\0' && (precision < 0 || --precision >= 0); width--) {
					putch(ch, putdat);
					p++;
				}
				for (; width > 0; width--)
					putch(' ', putdat);
				break;

				/* (signed) decimal */
			case 'd':
				num = getint(&ap, lflag);
				if ((long long) num < 0) {
					putch('-', putdat);
					num = -(long long) num;
				}
				base = 10;
				goto signed_number;

				/* unsigned decimal */
			case 'u':
				base = 10;
				goto unsigned_number;

				/* (unsigned) octal */
			case 'o':
				base = 8;
				goto unsigned_number;

				/* pointer */
			case 'p':
				static_assert(sizeof(long) == sizeof(void*))
				;
				lflag = 1;
				putch('0', putdat);
				putch('x', putdat);
				/* no break, fall through to hexidecimal */
				/* (unsigned) hexadecimal */
			case 'x':
				base = 16;
				unsigned_number: num = getuint(&ap, lflag);
				signed_number: printnum(putch, putdat, num, base, width, padc);
				break;

				/* escaped '%' character */
			case '%':
				putch(ch, putdat);
				break;

				/* unrecognized escape sequence */
			default:
				putch('%', putdat);
				fmt = last_fmt;
				break;
		}
	}
}
/*-----------------------------------------------------------*/

/* Cause normal process termination  */
void exit(int code)
{
	EXIT(code);
	//TODO syscall(SYS_exit, code, 0, 0);
	for(;;) { }
}
/*-----------------------------------------------------------*/

/* formatted output conversion to frontend */
int printf(const char* fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);

	vFormatPrintString((void*) putchar, 0, fmt, ap);

	va_end(ap);
	return 0; // incorrect return value, but who cares, anyway?
}
/*-----------------------------------------------------------*/

/* formatted output conversion to string */
int sprintf(char* str, const char* fmt, ...)
{
	va_list ap;
	char* str0 = str;
	va_start(ap, fmt);

	void sprintf_putch(int ch, void** data) {
		char** pstr = (char**) data;
		**pstr = ch;
		(*pstr)++;
	}

	vFormatPrintString(sprintf_putch, (void**) &str, fmt, ap);
	*str = 0;

	va_end(ap);
	return str - str0;
}
/*-----------------------------------------------------------*/