1

/*

     2

 * copyright 2008 Edouard TISSERANT

     3

 * copyright 2011 Mario de Sousa (msousa@fe.up.pt)

     4

 *

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 * Offered to the public under the terms of the GNU Lesser General Public

     6

 * License as published by the Free Software Foundation; either version 2

     7

 * of the License, or (at your option) any later version.

     8

 *

     9

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

    10

 * WITHOUT ANY WARRANTY; without even the implied warranty of

    11

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser

    12

 * General Public License for more details.

    13

 *

    14

 * This code is made available on the understanding that it will not be

    15

 * used in safety-critical situations without a full and competent review.

    16

 */

    17

    18

/****

    19

 * IEC 61131-3 standard function library

    20

 */

    21

    22

/* NOTE: This file is full of (what may seem at first) very strange macros.

    23

 *       If you want to know what all these strange macros are doing,

    24

 *       just parse this file through a C preprocessor (e.g. cpp), 

    25

 *       and analyse the output!

    26

 *       $gcc -E iec_std_lib.h 

    27

 */

    28

    29

#ifndef _IEC_STD_LIB_H

    30

#define _IEC_STD_LIB_H

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    32

    33

#include <limits.h>

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#include <float.h>

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#include <math.h>

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#include <stdint.h>

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#include <ctype.h>

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    39

#include <stdio.h>

    40

#include <stdlib.h>

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#include <string.h>

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#include <stdarg.h>

    43

    44

#ifdef DEBUG_IEC

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#define DBG(...) printf(__VA_ARGS__);

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#define DBG_TYPE(TYPENAME, name) __print_##TYPENAME(name);

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#else

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#define DBG(...)

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#define DBG_TYPE(TYPENAME, name)

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#endif

    51

    52

/*

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 * Include type defs.

    54

 */

    55

#include "iec_types_all.h"

    56

    57

extern TIME __CURRENT_TIME;

    58

extern BOOL __DEBUG;

    59

    60

/* TODO

    61

typedef struct {

    62

    __strlen_t len;

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    u_int16_t body[STR_MAX_LEN];

    64

} WSTRING;

    65

*/

    66

/*

    67

# if __WORDSIZE == 64

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#define __32b_sufix

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#define __64b_sufix L

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#else

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#define __32b_sufix L

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#define __64b_sufix LL

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#endif

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*/

    75

    76

# if __WORDSIZE == 64

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#define __32b_sufix

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#define __64b_sufix L

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#else

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#define __32b_sufix L

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/* changed this from LL to L temporarily. It was causing a bug when compiling resulting code with gcc.

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 * I have other things to worry about at the moment.. 

    83

 */

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#define __64b_sufix L   

    85

#endif

    86

    87

    88

#define __lit(type,value,...) (type)value##__VA_ARGS__

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// Keep this macro expention step to let sfx(__VA_ARGS__) change into L or LL

    90

#define __literal(type,value,...) __lit(type,value,__VA_ARGS__)

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#define __BOOL_LITERAL(value) __literal(BOOL,value)

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#define __SINT_LITERAL(value) __literal(SINT,value)

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#define __INT_LITERAL(value) __literal(INT,value)

    95

#define __DINT_LITERAL(value) __literal(DINT,value,__32b_sufix)

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#define __LINT_LITERAL(value) __literal(LINT,value,__64b_sufix)

    97

#define __USINT_LITERAL(value) __literal(USINT,value)

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#define __UINT_LITERAL(value) __literal(UINT,value)

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#define __UDINT_LITERAL(value) __literal(UDINT,value,__32b_sufix)

   100

#define __ULINT_LITERAL(value) __literal(ULINT,value,__64b_sufix)

   101

#define __REAL_LITERAL(value) __literal(REAL,value,__32b_sufix)

   102

#define __LREAL_LITERAL(value) __literal(LREAL,value,__64b_sufix)

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#define __TIME_LITERAL(value) __literal(TIME,value)

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#define __DATE_LITERAL(value) __literal(DATE,value)

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#define __TOD_LITERAL(value) __literal(TOD,value)

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#define __DT_LITERAL(value) __literal(DT,value)

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#define __STRING_LITERAL(count,value) (STRING){count,value}

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#define __BYTE_LITERAL(value) __literal(BYTE,value)

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#define __WORD_LITERAL(value) __literal(WORD,value)

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#define __DWORD_LITERAL(value) __literal(DWORD,value,__32b_sufix)

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#define __LWORD_LITERAL(value) __literal(LWORD,value,__64b_sufix)

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   113

   114

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#define __INIT_REAL 0

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#define __INIT_LREAL 0

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#define __INIT_SINT 0

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#define __INIT_INT 0

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#define __INIT_DINT 0

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#define __INIT_LINT 0

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#define __INIT_USINT 0

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#define __INIT_UINT 0

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#define __INIT_UDINT 0

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#define __INIT_ULINT 0

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#define __INIT_TIME (TIME){0,0}

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#define __INIT_BOOL 0

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#define __INIT_BYTE 0

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#define __INIT_WORD 0

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#define __INIT_DWORD 0

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#define __INIT_LWORD 0

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#define __INIT_STRING (STRING){0,""}

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//#define __INIT_WSTRING

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#define __INIT_DATE (DATE){0,0}

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#define __INIT_TOD (TOD){0,0}

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#define __INIT_DT (DT){0,0}

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   137

typedef union __IL_DEFVAR_T {

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    BOOL    BOOLvar;

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   140

    SINT    SINTvar;

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    INT     INTvar;

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    DINT    DINTvar;

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    LINT    LINTvar;

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    USINT   USINTvar;

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    UINT    UINTvar;

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    UDINT   UDINTvar;

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    ULINT   ULINTvar;

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    BYTE    BYTEvar;

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    WORD    WORDvar;

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    DWORD   DWORDvar;

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    LWORD   LWORDvar;

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    REAL    REALvar;

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    LREAL   LREALvar;

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    TIME    TIMEvar;

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    TOD TODvar;

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    DT  DTvar;

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    DATE    DATEvar;

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} __IL_DEFVAR_T;

   163

   164

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

   166

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

   167

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

   168

/*****      Some helper functions...                              *****/

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/*****                     ...used later:                         *****/

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/*****    - when declaring the IEC 61131-3 standard functions     *****/

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/*****    - in the C source code itself in SFC and ST expressions *****/

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

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

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

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   177

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

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/* Notify IEC runtime error */

   179

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

   180

   181

/* function that generates an IEC runtime error */

   182

static inline void __iec_error(void) {

   183

  /* TODO... */

   184

  fprintf(stderr, "IEC 61131-3 runtime error.\n");

   185

  /*exit(1);*/

   186

}

   187

   188

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

   189

/* Time normalization function */

   190

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

   191

   192

static inline void __normalize_timespec (IEC_TIMESPEC *ts) {

   193

  if( ts->tv_nsec < -1000000000 || (( ts->tv_sec > 0 ) && ( ts->tv_nsec < 0 ))){

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    ts->tv_sec--;

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    ts->tv_nsec += 1000000000;

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  }

   197

  if( ts->tv_nsec > 1000000000 || (( ts->tv_sec < 0 ) && ( ts->tv_nsec > 0 ))){

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    ts->tv_sec++;

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    ts->tv_nsec -= 1000000000;

   200

  }

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}

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

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/* Time conversion to/from timespec functions */

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

   206

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static inline IEC_TIMESPEC __time_to_timespec(int sign, double mseconds, double seconds, double minutes, double hours, double days) {

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  IEC_TIMESPEC ts;

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   210

  /* sign is 1 for positive values, -1 for negative time... */

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  long double total_sec = ((days*24 + hours)*60 + minutes)*60 + seconds + mseconds/1e3;

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  if (sign >= 0) sign = 1; else sign = -1;

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  ts.tv_sec = sign * (long int)total_sec;

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  ts.tv_nsec = sign * (long int)((total_sec - ts.tv_sec)*1e9);

   215

   216

  return ts;

   217

}

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   219

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static inline IEC_TIMESPEC __tod_to_timespec(double seconds, double minutes, double hours) {

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  IEC_TIMESPEC ts;

   222

   223

  long double total_sec = (hours*60 + minutes)*60 + seconds;

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  ts.tv_sec = (long int)total_sec;

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  ts.tv_nsec = (long int)((total_sec - ts.tv_sec)*1e9);

   226

   227

  return ts;

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}

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#define EPOCH_YEAR 1970

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#define SECONDS_PER_HOUR (60 * 60)

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#define SECONDS_PER_DAY (24 * SECONDS_PER_HOUR)

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#define __isleap(year) \

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  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))

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static const unsigned short int __mon_yday[2][13] =

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{

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  /* Normal years.  */

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  { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},

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  /* Leap years.  */

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  { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}

   241

};

   242

   243

typedef struct {

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	int tm_sec;			/* Seconds.	[0-60] (1 leap second) */

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	int tm_min;			/* Minutes.	[0-59] */

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	int tm_hour;		/* Hours.	[0-23] */

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	int tm_day;			/* Day.		[1-31] */

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	int tm_mon;			/* Month.	[0-11] */

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	int tm_year;		/* Year	*/

   250

} tm;

   251

   252

static inline tm convert_seconds_to_date_and_time(long int seconds) {

   253

  tm dt;

   254

  long int days, rem;

   255

  days = seconds / SECONDS_PER_DAY;

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  rem = seconds % SECONDS_PER_DAY;

   257

  if (rem < 0) {

   258

	  rem += SECONDS_PER_DAY;

   259

	  days--;

   260

  }

   261

   262

  // time of day

   263

  dt.tm_hour = rem / SECONDS_PER_HOUR;

   264

  rem %= SECONDS_PER_HOUR;

   265

  dt.tm_min = rem / 60;

   266

  dt.tm_sec = rem % 60;

   267

   268

  // date

   269

  dt.tm_year = EPOCH_YEAR;

   270

  while (days >= (rem = __isleap(dt.tm_year) ? 366 : 365)) {

   271

	  dt.tm_year++;

   272

	  days -= rem;

   273

  }

   274

  while (days < 0) {

   275

	  dt.tm_year--;

   276

	  days += __isleap(dt.tm_year) ? 366 : 365;

   277

  }

   278

  dt.tm_mon = 1;

   279

  while (days > __mon_yday[__isleap(dt.tm_year)][dt.tm_mon]) {

   280

	  dt.tm_mon += 1;

   281

  }

   282

  dt.tm_day = days - __mon_yday[__isleap(dt.tm_year)][dt.tm_mon - 1] + 1;

   283

   284

  return dt;

   285

}

   286

   287

static inline IEC_TIMESPEC __date_to_timespec(int day, int month, int year) {

   288

  IEC_TIMESPEC ts;

   289

  int a4, b4, a100, b100, a400, b400;

   290

  int yday;

   291

  int intervening_leap_days;

   292

   293

  if (month < 1 || month > 12)

   294

	 __iec_error();

   295

   296

  yday = __mon_yday[__isleap(year)][month - 1] + day;

   297

   298

  if (yday > __mon_yday[__isleap(year)][month])

   299

	  __iec_error();

   300

   301

  a4 = (year >> 2) - ! (year & 3);

   302

  b4 = (EPOCH_YEAR >> 2) - ! (EPOCH_YEAR & 3);

   303

  a100 = a4 / 25 - (a4 % 25 < 0);

   304

  b100 = b4 / 25 - (b4 % 25 < 0);

   305

  a400 = a100 >> 2;

   306

  b400 = b100 >> 2;

   307

  intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);

   308

   309

  ts.tv_sec = ((year - EPOCH_YEAR) * 365 + intervening_leap_days + yday - 1) * 24 * 60 * 60;

   310

  ts.tv_nsec = 0;

   311

   312

  return ts;

   313

}

   314

   315

static inline IEC_TIMESPEC __dt_to_timespec(double seconds, double minutes, double hours, int day, int month, int year) {

   316

  IEC_TIMESPEC ts_date = __date_to_timespec(day, month, year);

   317

  IEC_TIMESPEC ts = __tod_to_timespec(seconds, minutes, hours);

   318

   319

  ts.tv_sec += ts_date.tv_sec;

   320

   321

  return ts;

   322

}

   323

   324

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

   325

/* Time operations */

   326

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

   327

   328

#define __time_cmp(t1, t2) (t2.tv_sec == t1.tv_sec ? t1.tv_nsec - t2.tv_nsec : t1.tv_sec - t2.tv_sec)

   329

   330

static inline TIME __time_add(TIME IN1, TIME IN2){

   331

  TIME res ={IN1.tv_sec + IN2.tv_sec,

   332

             IN1.tv_nsec + IN2.tv_nsec };

   333

  __normalize_timespec(&res);

   334

  return res;

   335

}

   336

static inline TIME __time_sub(TIME IN1, TIME IN2){

   337

  TIME res ={IN1.tv_sec - IN2.tv_sec,

   338

             IN1.tv_nsec - IN2.tv_nsec };

   339

  __normalize_timespec(&res);

   340

  return res;

   341

}

   342

static inline TIME __time_mul(TIME IN1, LREAL IN2){

   343

  LREAL s_f = IN1.tv_sec * IN2;

   344

  time_t s = (time_t)s_f;

   345

  div_t ns = div((int)((LREAL)IN1.tv_nsec * IN2), 1000000000);

   346

  TIME res = {(long)s + ns.quot,

   347

		      (long)ns.rem + (s_f - s) * 1000000000 };

   348

  __normalize_timespec(&res);

   349

  return res;

   350

}

   351

static inline TIME __time_div(TIME IN1, LREAL IN2){

   352

  LREAL s_f = IN1.tv_sec / IN2;

   353

  time_t s = (time_t)s_f;

   354

  TIME res = {(long)s,

   355

              (long)(IN1.tv_nsec / IN2 + (s_f - s) * 1000000000) };

   356

  __normalize_timespec(&res);

   357

  return res;

   358

}

   359

   360

   361

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

   362

/* Convertions */

   363

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

   364

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

   365

    /*  REAL_TO_INT  */

   366

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

   367

static inline LINT __real_round(LREAL IN) {

   368

	return fmod(IN, 1) == 0 ? ((LINT)IN / 2) * 2 : (LINT)IN;

   369

}

   370

static inline LINT __preal_to_sint(LREAL IN) {

   371

   return IN >= 0 ? __real_round(IN + 0.5) : __real_round(IN - 0.5);

   372

}

   373

static inline LINT __preal_to_uint(LREAL IN) {

   374

   return IN >= 0 ? __real_round(IN + 0.5) : 0;

   375

}

   376

static inline LINT __real_to_sint(LREAL IN)  {return (LINT)__preal_to_sint(IN);}

   377

static inline LWORD __real_to_bit(LREAL IN)  {return (LWORD)__preal_to_uint(IN);}

   378

static inline ULINT __real_to_uint(LREAL IN) {return (ULINT)__preal_to_uint(IN);}

   379

   380

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

   381

    /*  TO_STRING  */

   382

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

   383

static inline STRING __bool_to_string(BOOL IN) {

   384

    if(IN) return (STRING){4, "TRUE"};

   385

    return (STRING){5,"FALSE"};

   386

}

   387

static inline STRING __bit_to_string(LWORD IN) {

   388

    STRING res;

   389

    res = __INIT_STRING;

   390

    res.len = snprintf((char*)res.body, STR_MAX_LEN, "16#%llx",(long long unsigned int)IN);

   391

    if(res.len > STR_MAX_LEN) res.len = STR_MAX_LEN;

   392

    return res;

   393

}

   394

static inline STRING __real_to_string(LREAL IN) {

   395

    STRING res;

   396

    res = __INIT_STRING;

   397

    res.len = snprintf((char*)res.body, STR_MAX_LEN, "%.10g", IN);

   398

    if(res.len > STR_MAX_LEN) res.len = STR_MAX_LEN;

   399

    return res;

   400

}

   401

static inline STRING __sint_to_string(LINT IN) {

   402

    STRING res;

   403

    res = __INIT_STRING;

   404

    res.len = snprintf((char*)res.body, STR_MAX_LEN, "%lld", (long long int)IN);

   405

    if(res.len > STR_MAX_LEN) res.len = STR_MAX_LEN;

   406

    return res;

   407

}

   408

static inline STRING __uint_to_string(ULINT IN) {

   409

    STRING res;

   410

    res = __INIT_STRING;

   411

    res.len = snprintf((char*)res.body, STR_MAX_LEN, "%llu", (long long unsigned int)IN);

   412

    if(res.len > STR_MAX_LEN) res.len = STR_MAX_LEN;

   413

    return res;

   414

}

   415

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

   416

    /* FROM_STRING */

   417

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

   418

static inline BOOL __string_to_bool(STRING IN) {

   419

    int i;

   420

    if (IN.len == 1) return !memcmp(&IN.body,"1", IN.len);

   421

    for (i = 0; i < IN.len; i++) IN.body[i] = toupper(IN.body[i]);

   422

    return IN.len == 4 ? !memcmp(&IN.body,"TRUE", IN.len) : 0;

   423

}

   424

   425

static inline LINT __pstring_to_sint(STRING* IN) {

   426

    LINT res = 0;

   427

    __strlen_t l;

   428

    unsigned int shift = 0;

   429

   430

    if(IN->body[0]=='2' && IN->body[1]=='#'){

   431

        /* 2#0101_1010_1011_1111 */

   432

        for(l = IN->len - 1; l >= 2 && shift < 64; l--)

   433

        {

   434

            char c = IN->body[l];

   435

            if( c >= '0' && c <= '1'){

   436

                res |= ( c - '0') << shift;

   437

                shift += 1;

   438

            }

   439

        }

   440

    }else if(IN->body[0]=='8' && IN->body[1]=='#'){

   441

        /* 8#1234_5665_4321 */

   442

        for(l = IN->len - 1; l >= 2 && shift < 64; l--)

   443

        {

   444

            char c = IN->body[l];

   445

            if( c >= '0' && c <= '7'){

   446

                res |= ( c - '0') << shift;

   447

                shift += 3;

   448

            }

   449

        }

   450

    }else if(IN->body[0]=='1' && IN->body[1]=='6' && IN->body[2]=='#'){

   451

        /* 16#1234_5678_9abc_DEFG */

   452

        for(l = IN->len - 1; l >= 3 && shift < 64; l--)

   453

        {

   454

            char c = IN->body[l];

   455

            if( c >= '0' && c <= '9'){

   456

                res |= (LWORD)( c - '0') << shift;

   457

                shift += 4;

   458

            }else if( c >= 'a' && c <= 'f'){

   459

                res |= (LWORD)( c - 'a' + 10 ) << shift;

   460

                shift += 4;

   461

            }else if( c >= 'A' && c <= 'F'){

   462

                res |= (LWORD)( c - 'A' + 10 ) << shift;

   463

                shift += 4;

   464

            }

   465

        }

   466

    }else{

   467

        /* -123456789 */

   468

        LINT fac = IN->body[0] == '-' ? -1 : 1;

   469

        for(l = IN->len - 1; l >= 0 && shift < 20; l--)

   470

        {

   471

            char c = IN->body[l];

   472

            if( c >= '0' && c <= '9'){

   473

                res += ( c - '0') * fac;

   474

                fac *= 10;

   475

                shift += 1;

   476

            }else if( c >= '.' ){ /* reset value */

   477

                res = 0;

   478

                fac = IN->body[0] == '-' ? -1 : 1;

   479

                shift = 0;

   480

            }

   481

        }

   482

    }

   483

    return res;

   484

}

   485

   486

static inline LINT  __string_to_sint(STRING IN) {return (LINT)__pstring_to_sint(&IN);}

   487

static inline LWORD __string_to_bit (STRING IN) {return (LWORD)__pstring_to_sint(&IN);}

   488

static inline ULINT __string_to_uint(STRING IN) {return (ULINT)__pstring_to_sint(&IN);}

   489

static inline LREAL __string_to_real(STRING IN) {

   490

    __strlen_t l;

   491

    l = IN.len;

   492

    /* search the dot */

   493

    while(--l > 0 && IN.body[l] != '.');

   494

    if(l != 0){

   495

        return atof((const char *)&IN.body);

   496

    }else{

   497

        return (LREAL)__pstring_to_sint(&IN);

   498

    }

   499

}

   500