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/******************************************************************************

 * Standard Library                                                           *

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

 * Copyright (C)2011  Mathias Hörtnagl <mathias.hoertnagl@gmail.com>          *

 *                                                                            *

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

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

 * the Free Software Foundation, either version 3 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 General Public License for more details.                               *

 *                                                                            *

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

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.      *

 ******************************************************************************/

#include "stddef.h"

#ifndef _STDLIB_H

#define _STDLIB_H

/******************************************************************************

 * Timer                                                                      *

 ******************************************************************************/

 /* Porgammable Intervall Timer control loaction. */

#define PIT_ADDRESS ((volatile uint *) 0xfffff000)

/* Time periods in seconds and milliseconds respectivly.

   NOTE: No hardware implementation of multiplication available! */

#define sec(x)    ( 50000000*x )

#define msec(x)   ( 50000*x )

/******************************************************************************

 * RS-232                                                                     *

 ******************************************************************************/

/* RS-232 Receiver Address. */

#define RS232_ADDRESS  ((volatile uint *) 0xffff4000)

/* Poll for valid received serial data. */

#define RS232_RCV_POLL ((ushort) 0x8000)

/* 10 times x. */

#define x10(x) ( (x << 3) + (x << 1) )

/******************************************************************************

 * Timer                                                                      *

 ******************************************************************************/

/* Resets the counter. If you call reset before the counter has finished, it

   returns the count progress. */

extern uint pit_reset();

/* Set the PIT limit and start counting. */

extern void pit_run(uint cycles);

/******************************************************************************

 * RS-232                                                                     *

 ******************************************************************************/

 /* Wait for one byte of data. Return n reception. */

extern uchar rs232_receive();

/* Send one byte of data. */

extern void rs232_transmit(uchar chr);

/******************************************************************************

 * Memory Operations                                                          *

 ******************************************************************************/

extern void memcpy(const void *src, void *dst, uint len);

extern void memset(const void *ptr, int val, uint len);

extern int memcmp(const void *src, void *dst, uint len);

/******************************************************************************

 * String Operations                                                          *

 ******************************************************************************/

/* Returns the length of a string */

extern uint strlen(const uchar *str);

/* Copys a string at location src to location dst. */

extern void strcpy(const uchar *src, uchar *dst);

// KMP algo

// char *strstr(const char *str, const char *pat);

/* Returns a pointer to the leftmost occurence of character chr in

   string str or NULL, if not found. */

extern uchar *strchr(const uchar *str, const uchar chr);

/******************************************************************************

 * Number/String Conversion                                                   *

 ******************************************************************************/

/* Convert a string containing a decimal number into a number. */

extern int atoi(const uchar *str);

//extern char* itoa(int num, char *str);

/* Returns a binary representation of an integer <num>. The buffer <str> must be

   at least 35 byte wide to hold the char sequence of the form '0bn...n\0'. */

extern uchar* itob(int num, uchar *str);

/* Returns a hexadecimal representation of an integer <num>. The buffer <str>

   must be at least 11 byte wide to hold the char sequence of the form

   '0xn...n\0'. */

extern uchar* itox(int num, uchar *str);

/******************************************************************************

 * Nathematics                                                                *

 ******************************************************************************/

/* Xorshift RNGs, George Marsaglia

   http://www.jstatsoft.org/v08/i14/paper */

extern uint rand();

/* Radix-4 Booth Multiplication Algorithm */

extern int mul(short a, short b);

extern short div(int a, int b);

// extern void *malloc(uint size);

// extern void *calloc(uint num, uint size);

// extern void free(void *ptr);

#endif