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

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 * 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

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 * 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), 

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 *       and analyse the output!

    26

 *       $gcc -E iec_std_lib.h 

    27

 */

    28

    29

#ifndef _IEC_STD_LIB_H

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#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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#include <stdio.h>

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#include <stdlib.h>

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#include <string.h>

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#include <stdarg.h>

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    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

 */

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#include "iec_types_all.h"

    56

    57

extern TIME __CURRENT_TIME;

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extern BOOL __DEBUG;

    59

    60

/* TODO

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typedef struct {

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    __strlen_t len;

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    u_int16_t body[STR_MAX_LEN];

    64

} WSTRING;

    65

*/

    66

/*

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# 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

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# 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   

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#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

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#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)

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

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

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#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)

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

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

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#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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typedef union __IL_DEFVAR_T {

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    BOOL    BOOLvar;

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    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;

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

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

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

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

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/* Notify IEC runtime error */

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

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/* function that generates an IEC runtime error */

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static inline void __iec_error(void) {

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  /* TODO... */

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

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  /*exit(1);*/

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}

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

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/* Time normalization function */

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

   168

   169

static inline void __normalize_timespec (IEC_TIMESPEC *ts) {

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  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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  }

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  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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  }

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}

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

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/* Time conversion to/from timespec functions */

   182

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

   183

/* NOTE: The following function was turned into a macro, so it could be used to initialize the initial value of TIME variables.

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 *       Since each macro parameter is evaluated several times, the macro may result in multiple function invocations if an expression

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 *       containing a function invocation is passed as a parameter. However, currently matiec only uses this conversion macro with 

   186

 *       constant literals, so it is safe to change it into a macro.

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 */

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/* NOTE: I (Mario - msousa@fe.up.pt) believe that the following function contains a bug when handling negative times.

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 *       The equivalent macro has this bug fixed.

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 *       e.g.;

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 *          T#3.8s

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 *       using the function, will result in a timespec of 3.8s !!!: 

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 *          tv_sec  =  4               <-----  1 *  3.8           is rounded up when converting a double to an int!

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 *          tv_nsec = -200 000 000     <-----  1 * (3.8 - 4)*1e9

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 * 

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 *         -T#3.8s

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 *       using the function, will result in a timespec of -11.8s !!!: 

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 *          tv_sec  = -4                 <-----  -1 *  3.8 is rounded down when converting a double to an int!

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 *          tv_nsec = -7 800 000 000     <-----  -1 * (3.8 - -4)*1e9

   200

 */

   201

/* NOTE: Due to the fact that the C compiler may round a tv_sec number away from zero, 

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 *       the following macro may result in a timespec that is not normalized, i.e. with a tv_sec > 0, and a tv_nsec < 0 !!!!

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 *       This is due to the rounding that C compiler applies when converting a (long double) to a (long int).

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 *       To produce normalized timespec's we need to use floor(), but we cannot call any library functions since we want this macro to be 

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 *       useable as a variable initializer.

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 *       VAR x : TIME = T#3.5h; END_VAR --->  IEC_TIME x = __time_to_timespec(1, 0, 0, 0, 3.5, 0);

   207

 */

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/*

   209

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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   212

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

   213

  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;

   216

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

   217

   218

  return ts;

   219

}

   220

*/

   221

/* NOTE: Unfortunately older versions of ANSI C (e.g. C99) do not allow explicit identification of elements in initializers

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 *         e.g.  {tv_sec = 1, tv_nsec = 300}

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 *       They are therefore commented out. This however means that any change to the definition of IEC_TIMESPEC may require this

   224

 *       macro to be updated too!

   225

 */

   226

#define __time_to_timespec(sign,mseconds,seconds,minutes,hours,days) \

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          ((IEC_TIMESPEC){\

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              /*tv_sec  =*/ ((long int)   (((sign>=0)?1:-1)*((((long double)days*24 + (long double)hours)*60 + (long double)minutes)*60 + (long double)seconds + (long double)mseconds/1e3))), \

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              /*tv_nsec =*/ ((long int)(( \

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                            ((long double)(((sign>=0)?1:-1)*((((long double)days*24 + (long double)hours)*60 + (long double)minutes)*60 + (long double)seconds + (long double)mseconds/1e3))) - \

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                            ((long int)   (((sign>=0)?1:-1)*((((long double)days*24 + (long double)hours)*60 + (long double)minutes)*60 + (long double)seconds + (long double)mseconds/1e3)))   \

   232

                            )*1e9))\

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        })

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   235

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   237

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/* NOTE: The following function was turned into a macro, so it could be used to initialize the initial value of TOD (TIME_OF_DAY) variables */

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/* NOTE: many (but not all) of the same comments made regarding __time_to_timespec() are also valid here, so go and read those comments too!

   240

/*

   241

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

   242

  IEC_TIMESPEC ts;

   243

   244

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

   245

  ts.tv_sec = (long int)total_sec;

   246

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

   247

   248

  return ts;

   249

}

   250

*/

   251

#define __tod_to_timespec(seconds,minutes,hours) \

   252

          ((IEC_TIMESPEC){\

   253

              /*tv_sec  =*/ ((long int)   ((((long double)hours)*60 + (long double)minutes)*60 + (long double)seconds)), \

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              /*tv_nsec =*/ ((long int)(( \

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                            ((long double)((((long double)hours)*60 + (long double)minutes)*60 + (long double)seconds)) - \

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                            ((long int)   ((((long double)hours)*60 + (long double)minutes)*60 + (long double)seconds))   \

   257

                            )*1e9))\

   258

        })

   259

   260

   261

#define EPOCH_YEAR 1970

   262

#define SECONDS_PER_MINUTE 60

   263

#define SECONDS_PER_HOUR (60 * SECONDS_PER_MINUTE)

   264

#define SECONDS_PER_DAY (24 * SECONDS_PER_HOUR)

   265

#define __isleap(year) \

   266

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

   267

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

   268

{

   269

  /* Normal years.  */

   270

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

   271

  /* Leap years.  */

   272

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

   273

};

   274

   275

typedef struct {

   276

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

   277

	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] */

   280

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

   281

	int tm_year;			/* Year	*/

   282

} tm;

   283

   284

static inline tm convert_seconds_to_date_and_time(long int seconds) {

   285

  tm dt;

   286

  long int days, rem;

   287

  days = seconds / SECONDS_PER_DAY;

   288

  rem = seconds % SECONDS_PER_DAY;

   289

  if (rem < 0) {

   290

	  rem += SECONDS_PER_DAY;

   291

	  days--;

   292

  }

   293

   294

  // time of day

   295

  dt.tm_hour = rem / SECONDS_PER_HOUR;

   296

  rem %= SECONDS_PER_HOUR;

   297

  dt.tm_min = rem / 60;

   298

  dt.tm_sec = rem % 60;

   299

   300

  // date

   301

  dt.tm_year = EPOCH_YEAR;

   302

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

   303

	  dt.tm_year++;

   304

	  days -= rem;

   305

  }

   306

  while (days < 0) {

   307

	  dt.tm_year--;

   308

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

   309

  }

   310

  dt.tm_mon = 1;

   311

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

   312

	  dt.tm_mon += 1;

   313

  }

   314

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

   315

   316

  return dt;

   317

}

   318

   319

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

   320

  IEC_TIMESPEC ts;

   321

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

   322

  int yday;

   323

  int intervening_leap_days;

   324

   325

  if (month < 1 || month > 12)

   326

	 __iec_error();

   327

   328

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

   329

   330

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

   331

	  __iec_error();

   332

   333

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

   334

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

   335

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

   336

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

   337

  a400 = a100 >> 2;

   338

  b400 = b100 >> 2;

   339

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

   340

   341

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

   342

  ts.tv_nsec = 0;

   343

   344

  return ts;

   345

}

   346

   347

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

   348

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

   349

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

   350

   351

  ts.tv_sec += ts_date.tv_sec;

   352

   353

  return ts;

   354

}

   355

   356

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

   357

/* Time operations */

   358

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

   359

   360

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

   361

   362

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

   363

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

   364

             IN1.tv_nsec + IN2.tv_nsec };

   365

  __normalize_timespec(&res);

   366

  return res;

   367

}

   368

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

   369

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

   370

             IN1.tv_nsec - IN2.tv_nsec };

   371

  __normalize_timespec(&res);

   372

  return res;

   373

}

   374

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

   375

  LREAL s_f = IN1.tv_sec * IN2;

   376

  time_t s = (time_t)s_f;

   377

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

   378

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

   379

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

   380

  __normalize_timespec(&res);

   381

  return res;

   382

}

   383

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

   384

  LREAL s_f = IN1.tv_sec / IN2;

   385

  time_t s = (time_t)s_f;

   386

  TIME res = {(long)s,

   387

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

   388

  __normalize_timespec(&res);

   389

  return res;

   390

}

   391

   392

   393

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

   394

/* Convertions */

   395

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

   396

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

   397

    /*  REAL_TO_INT  */

   398

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

   399

static inline LINT __real_round(LREAL IN) {

   400

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

   401

}

   402

static inline LINT __preal_to_sint(LREAL IN) {

   403

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

   404

}

   405

static inline LINT __preal_to_uint(LREAL IN) {

   406

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

   407

}

   408

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

   409

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

   410

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

   411

   412

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

   413

    /*  TO_STRING  */

   414

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

   415

static inline STRING __bool_to_string(BOOL IN) {

   416

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

   417

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

   418

}

   419

static inline STRING __bit_to_string(LWORD IN) {

   420

    STRING res;

   421

    res = __INIT_STRING;

   422

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

   423

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

   424

    return res;

   425

}

   426

static inline STRING __real_to_string(LREAL IN) {

   427

    STRING res;

   428

    res = __INIT_STRING;

   429

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

   430

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

   431

    return res;

   432

}

   433

static inline STRING __sint_to_string(LINT IN) {

   434

    STRING res;

   435

    res = __INIT_STRING;

   436

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

   437

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

   438

    return res;

   439

}

   440

static inline STRING __uint_to_string(ULINT IN) {

   441

    STRING res;

   442

    res = __INIT_STRING;

   443

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

   444

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

   445

    return res;

   446

}

   447

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

   448

    /* FROM_STRING */

   449

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

   450

static inline BOOL __string_to_bool(STRING IN) {

   451

    int i;

   452

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

   453

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

   454

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

   455

}

   456

   457

static inline LINT __pstring_to_sint(STRING* IN) {

   458

    LINT res = 0;

   459

    __strlen_t l;

   460

    unsigned int shift = 0;

   461

   462

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

   463

        /* 2#0101_1010_1011_1111 */

   464

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

   465

        {

   466

            char c = IN->body[l];

   467

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

   468

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

   469

                shift += 1;

   470

            }

   471

        }

   472

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

   473

        /* 8#1234_5665_4321 */

   474

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

   475

        {

   476

            char c = IN->body[l];

   477

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

   478

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

   479

                shift += 3;

   480

            }

   481

        }

   482

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

   483

        /* 16#1234_5678_9abc_DEFG */

   484

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

   485

        {

   486

            char c = IN->body[l];

   487

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

   488

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

   489

                shift += 4;

   490

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

   491

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

   492

                shift += 4;

   493

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

   494

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

   495

                shift += 4;

   496

            }

   497

        }

   498

    }else{