536 lines
12 KiB
C
536 lines
12 KiB
C
/* $Id$ */
|
||
/*
|
||
* Author: Julie Sander and Bob Dalesio
|
||
* Date: 07-27-87
|
||
*
|
||
* Experimental Physics and Industrial Control System (EPICS)
|
||
*
|
||
* Copyright 1991, the Regents of the University of California,
|
||
* and the University of Chicago Board of Governors.
|
||
*
|
||
* This software was produced under U.S. Government contracts:
|
||
* (W-7405-ENG-36) at the Los Alamos National Laboratory,
|
||
* and (W-31-109-ENG-38) at Argonne National Laboratory.
|
||
*
|
||
* Initial development by:
|
||
* The Controls and Automation Group (AT-8)
|
||
* Ground Test Accelerator
|
||
* Accelerator Technology Division
|
||
* Los Alamos National Laboratory
|
||
*
|
||
* Co-developed with
|
||
* The Controls and Computing Group
|
||
* Accelerator Systems Division
|
||
* Advanced Photon Source
|
||
* Argonne National Laboratory
|
||
*
|
||
* Modification Log:
|
||
* -----------------
|
||
* .01 5-18-88 lrd modified modulo and power to avoid math library
|
||
* .02 5-19-88 lrd modified absolute value to avoid math library
|
||
* defined unary math lib routines as doubles
|
||
* removed include math.h
|
||
* stopped loading dinglers math routines (ml)
|
||
* wrote a random number generator to return a
|
||
* double between 0 and 1
|
||
* .03 12-09-88 lrd fixed modulo not to perform zero division
|
||
* .04 12-12-88 lrd lock the record while processing
|
||
* .05 12-13-88 lrd made an alarm for math error
|
||
* .06 12-15-88 lrd Process the forward scan link
|
||
* .07 12-23-88 lrd Alarm on locked MAX_LOCKED times
|
||
* .08 01-11-89 lrd Add Right and Left Shift
|
||
* .09 02-01-89 lrd Add Trig functions
|
||
* .10 03-14-89 lrd fix true on C question mark operator
|
||
* .11 03-29-89 lrd make hardware errors MAJOR
|
||
* remove hw severity spec from database
|
||
* .12 04-06-89 lrd add monitor detection
|
||
* .13 05-03-89 lrd removed process mask from arg list
|
||
* .14 06-05-89 lrd check for negative square root
|
||
* .15 08-01-89 lrd full range of exponentiation using pow(x,y)
|
||
* .16 04-04-90 lrd fix post events for read and calc alarms
|
||
* fix neg base raised to integer exponent
|
||
* .17 04-06-90 lrd change conditional to check for 0 and non-zero
|
||
* instead of 0 and 1 (more 'C' like)
|
||
* .18 09-10-90 lrd add time stamps
|
||
* .19 11-26-90 lrd add bit not and relational not - fix RNDM
|
||
* .20 11-29-90 lrd conditionally process soft channels
|
||
* .21 12-14-90 lrd fixed post events for the variables
|
||
* .22 03-15-91 mrk moved code from calcRecord to here
|
||
* .23 08-01-91 rac don't use FETCH_G ... for V2
|
||
* .24 02-20-92 rcz fixed for vxWorks build
|
||
* .25 02-24-92 jba add EXP and fix for EXPON when *pstacktop is 0
|
||
* .26 02-28-92 jba added CEIL and FLOOR
|
||
* .27 03-06-92 jba added MAX and MIN binary functions
|
||
* .28 03-10-92 jba added multiple conditional expressions ?
|
||
* .29 04-01-92 jba allowed floating pt constants in expression
|
||
* .30 05-01-92 jba flt pt constant string replaced with double in postfix
|
||
* .31 08-21-92 jba ANSI c changes
|
||
* .32 12-11-92 mrk Removed include for stdioLib.h
|
||
* .33 08-04-93 mgb Removed V5/V4 and EPICS_V2 conditionals
|
||
* .34 05-11-94 jba Added support for CONST_PI, CONST_D2R, and CONST_R2D
|
||
* .34 08-18-94 jba Must skip over constant when looking for COND_END,COND_ELSE
|
||
* .35 10-07-94 mda change local random() to local_random() to
|
||
* avoid colliding with math library random()
|
||
|
||
$Log%
|
||
|
||
*/
|
||
|
||
/* This module contains the code for processing the arithmetic
|
||
* expressions defined in calculation records. postfix must be called
|
||
* to convert a valid infix expression to postfix. CalcPerform
|
||
* calculates the postfix expression.
|
||
*
|
||
* Subroutines
|
||
*
|
||
* Public
|
||
*
|
||
* calcPerform perform the calculation
|
||
* args
|
||
* double *pargs address of arguments (12)
|
||
* double *presult address of result
|
||
* char *rpcl address of reverse polish buffer
|
||
* returns
|
||
* 0 fetched successfully
|
||
* -1 fetch failed
|
||
*
|
||
* Private routine for calcPerform
|
||
* local_random random number generator
|
||
* returns
|
||
* double value between 0.00 and 1.00
|
||
*/
|
||
|
||
#ifdef vxWorks
|
||
# include <vxWorks.h>
|
||
/*# include <varargs.h>*/
|
||
# include <fioLib.h>
|
||
#else
|
||
# include <stdio.h>
|
||
#endif
|
||
|
||
#include <string.h>
|
||
#include <dbDefs.h>
|
||
#include <post.h>
|
||
#include <math.h>
|
||
|
||
static double local_random();
|
||
|
||
#define NOT_SET 0
|
||
#define TRUE_COND 1
|
||
#define FALSE_COND 2
|
||
|
||
#ifndef PI
|
||
#define PI 3.141592654
|
||
#endif
|
||
|
||
long calcPerform(parg,presult,post)
|
||
double *parg;
|
||
double *presult;
|
||
char *post;
|
||
{
|
||
double *pstacktop; /* stack of values */
|
||
double stack[80];
|
||
short temp1;
|
||
short i;
|
||
double *top;
|
||
int itop; /* integer top value */
|
||
int inexttop; /* ineteger next to top value */
|
||
short cond_flag; /* conditional else flag */
|
||
short got_if;
|
||
|
||
/* initialize flag */
|
||
cond_flag = NOT_SET;
|
||
pstacktop = &stack[0];
|
||
|
||
/* DEBUG print statements
|
||
for (i=0;i<184;i++){
|
||
printf ("%d_",post[i]);
|
||
if ( post[i] == -1 ) break;
|
||
if ( post[i] == 71 ) i=i+8;
|
||
}
|
||
printf ("*FINISHED*\n");
|
||
*/
|
||
|
||
/* set post to postfix expression in calc structure */
|
||
top = pstacktop;
|
||
|
||
/* polish calculator loop */
|
||
while (*post != END_STACK){
|
||
|
||
switch (*post){
|
||
case FETCH_A:
|
||
++pstacktop;
|
||
*pstacktop = parg[0];
|
||
break;
|
||
|
||
case FETCH_B:
|
||
++pstacktop;
|
||
*pstacktop = parg[1];
|
||
break;
|
||
|
||
case FETCH_C:
|
||
++pstacktop;
|
||
*pstacktop = parg[2];
|
||
break;
|
||
|
||
case FETCH_D:
|
||
++pstacktop;
|
||
*pstacktop = parg[3];
|
||
break;
|
||
|
||
case FETCH_E:
|
||
++pstacktop;
|
||
*pstacktop = parg[4];
|
||
break;
|
||
|
||
case FETCH_F:
|
||
++pstacktop;
|
||
*pstacktop = parg[5];
|
||
break;
|
||
|
||
case FETCH_G:
|
||
++pstacktop;
|
||
*pstacktop = parg[6];
|
||
break;
|
||
|
||
case FETCH_H:
|
||
++pstacktop;
|
||
*pstacktop = parg[7];
|
||
break;
|
||
|
||
case FETCH_I:
|
||
++pstacktop;
|
||
*pstacktop = parg[8];
|
||
break;
|
||
|
||
case FETCH_J:
|
||
++pstacktop;
|
||
*pstacktop = parg[9];
|
||
break;
|
||
|
||
case FETCH_K:
|
||
++pstacktop;
|
||
*pstacktop = parg[10];
|
||
break;
|
||
|
||
case FETCH_L:
|
||
++pstacktop;
|
||
*pstacktop = parg[11];
|
||
break;
|
||
|
||
case CONST_PI:
|
||
++pstacktop;
|
||
*pstacktop = PI;
|
||
break;
|
||
|
||
case CONST_D2R:
|
||
++pstacktop;
|
||
*pstacktop = PI/180.;
|
||
break;
|
||
|
||
case CONST_R2D:
|
||
++pstacktop;
|
||
*pstacktop = 180./PI;
|
||
break;
|
||
|
||
case ADD:
|
||
--pstacktop;
|
||
*pstacktop = *pstacktop + *(pstacktop+1);
|
||
break;
|
||
|
||
case SUB:
|
||
--pstacktop;
|
||
*pstacktop = *pstacktop - *(pstacktop+1);
|
||
break;
|
||
|
||
case MULT:
|
||
--pstacktop;
|
||
*pstacktop = *pstacktop * *(pstacktop+1);
|
||
break;
|
||
|
||
case DIV:
|
||
--pstacktop;
|
||
if (*(pstacktop+1) == 0) /* can't divide by zero */
|
||
return(-1);
|
||
*pstacktop = *pstacktop / *(pstacktop+1);
|
||
break;
|
||
|
||
case COND_IF:
|
||
/* if false condition then skip true expression */
|
||
if (*pstacktop == 0.0) {
|
||
/* skip to matching COND_ELSE */
|
||
for (got_if=1; got_if>0 && *(post+1) != END_STACK; ++post) {
|
||
if (*(post+1) == CONSTANT ) post+=8;
|
||
else if (*(post+1) == COND_IF ) got_if++;
|
||
else if (*(post+1) == COND_ELSE) got_if--;
|
||
}
|
||
}
|
||
/* remove condition from stack top */
|
||
--pstacktop;
|
||
break;
|
||
|
||
case COND_ELSE:
|
||
/* result, true condition is on stack so skip false condition */
|
||
/* skip to matching COND_END */
|
||
for (got_if=1; got_if>0 && *(post+1) != END_STACK; ++post) {
|
||
if (*(post+1) == CONSTANT ) post+=8;
|
||
else if (*(post+1) == COND_IF ) got_if++;
|
||
else if (*(post+1) == COND_END) got_if--;
|
||
}
|
||
break;
|
||
|
||
case COND_END:
|
||
break;
|
||
|
||
case ABS_VAL:
|
||
if (*pstacktop < 0) *pstacktop = -*pstacktop;
|
||
break;
|
||
|
||
case UNARY_NEG:
|
||
*pstacktop = -1* (*pstacktop);
|
||
break;
|
||
|
||
case SQU_RT:
|
||
if (*pstacktop < 0) return(-1); /* undefined */
|
||
*pstacktop = sqrt(*pstacktop);
|
||
break;
|
||
|
||
case EXP:
|
||
*pstacktop = exp(*pstacktop);
|
||
break;
|
||
|
||
case LOG_10:
|
||
*pstacktop = log10(*pstacktop);
|
||
break;
|
||
|
||
case LOG_E:
|
||
*pstacktop = log(*pstacktop);
|
||
break;
|
||
|
||
case RANDOM:
|
||
++pstacktop;
|
||
*pstacktop = local_random();
|
||
break;
|
||
|
||
case EXPON:
|
||
--pstacktop;
|
||
if (*pstacktop == 0) break;
|
||
if (*pstacktop < 0){
|
||
temp1 = (int) *(pstacktop+1);
|
||
/* is exponent an integer */
|
||
if ((*(pstacktop+1) - (double)temp1) != 0) return (-1);
|
||
*pstacktop = exp(*(pstacktop+1) * log(-*pstacktop));
|
||
/* is value negative */
|
||
if ((temp1 % 2) > 0) *pstacktop = -*pstacktop;
|
||
}else{
|
||
*pstacktop = exp(*(pstacktop+1) * log(*pstacktop));
|
||
}
|
||
break;
|
||
|
||
case MODULO:
|
||
--pstacktop;
|
||
itop = (int)*pstacktop;
|
||
inexttop = (int)*(pstacktop+1);
|
||
if (inexttop == 0)
|
||
return(-1);
|
||
i = itop % inexttop;
|
||
*pstacktop = i;
|
||
break;
|
||
|
||
case REL_OR:
|
||
--pstacktop;
|
||
*pstacktop = (*pstacktop || *(pstacktop+1));
|
||
break;
|
||
|
||
case REL_AND:
|
||
--pstacktop;
|
||
*pstacktop = (*pstacktop && *(pstacktop+1));
|
||
break;
|
||
|
||
case BIT_OR:
|
||
/* force double values into integers and or them */
|
||
itop = (int)*pstacktop;
|
||
inexttop = (int)*(pstacktop-1);
|
||
--pstacktop;
|
||
*pstacktop = (inexttop | itop);
|
||
break;
|
||
|
||
case BIT_AND:
|
||
/* force double values into integers and and them */
|
||
itop = (int)*pstacktop;
|
||
inexttop = (int)*(pstacktop-1);
|
||
--pstacktop;
|
||
*pstacktop = (inexttop & itop);
|
||
break;
|
||
|
||
case BIT_EXCL_OR:
|
||
/*force double values to integers to exclusive or them*/
|
||
itop = (int)*pstacktop;
|
||
inexttop = (int)*(pstacktop-1);
|
||
--pstacktop;
|
||
*pstacktop = (inexttop ^ itop);
|
||
break;
|
||
|
||
case GR_OR_EQ:
|
||
--pstacktop;
|
||
*pstacktop = *pstacktop >= *(pstacktop+1);
|
||
break;
|
||
|
||
case GR_THAN:
|
||
--pstacktop;
|
||
*pstacktop = *pstacktop > *(pstacktop+1);
|
||
break;
|
||
|
||
case LESS_OR_EQ:
|
||
--pstacktop;
|
||
*pstacktop = *pstacktop <= *(pstacktop+1);
|
||
break;
|
||
|
||
case LESS_THAN:
|
||
--pstacktop;
|
||
*pstacktop = *pstacktop < *(pstacktop+1);
|
||
break;
|
||
|
||
case NOT_EQ:
|
||
--pstacktop;
|
||
*pstacktop = *pstacktop != *(pstacktop+1);
|
||
break;
|
||
|
||
case EQUAL:
|
||
--pstacktop;
|
||
*pstacktop = (*pstacktop == *(pstacktop+1));
|
||
break;
|
||
|
||
case RIGHT_SHIFT:
|
||
itop = (int)*pstacktop;
|
||
inexttop = (int)*(pstacktop-1);
|
||
--pstacktop;
|
||
*pstacktop = (inexttop >> itop);
|
||
break;
|
||
|
||
case LEFT_SHIFT:
|
||
itop = (int)*pstacktop;
|
||
inexttop = (int)*(pstacktop-1);
|
||
--pstacktop;
|
||
*pstacktop = (inexttop << itop);
|
||
break;
|
||
|
||
case MAX:
|
||
--pstacktop;
|
||
if (*pstacktop < *(pstacktop+1))
|
||
*pstacktop = *(pstacktop+1);
|
||
break;
|
||
|
||
case MIN:
|
||
--pstacktop;
|
||
if (*pstacktop > *(pstacktop+1))
|
||
*pstacktop = *(pstacktop+1);
|
||
break;
|
||
|
||
|
||
case ACOS:
|
||
*pstacktop = acos(*pstacktop);
|
||
break;
|
||
|
||
case ASIN:
|
||
*pstacktop = asin(*pstacktop);
|
||
break;
|
||
|
||
case ATAN:
|
||
*pstacktop = atan(*pstacktop);
|
||
break;
|
||
|
||
case COS:
|
||
*pstacktop = cos(*pstacktop);
|
||
break;
|
||
|
||
case SIN:
|
||
*pstacktop = sin(*pstacktop);
|
||
break;
|
||
|
||
case TAN:
|
||
*pstacktop = tan(*pstacktop);
|
||
break;
|
||
|
||
case COSH:
|
||
*pstacktop = cosh(*pstacktop);
|
||
break;
|
||
|
||
case SINH:
|
||
*pstacktop = sinh(*pstacktop);
|
||
break;
|
||
|
||
case TANH:
|
||
*pstacktop = tanh(*pstacktop);
|
||
break;
|
||
|
||
case CEIL:
|
||
*pstacktop = ceil(*pstacktop);
|
||
break;
|
||
|
||
case FLOOR:
|
||
*pstacktop = floor(*pstacktop);
|
||
break;
|
||
|
||
case REL_NOT:
|
||
*pstacktop = ((*pstacktop)?0:1);
|
||
break;
|
||
|
||
case BIT_NOT:
|
||
itop = (int)*pstacktop;
|
||
*pstacktop = ~itop;
|
||
break;
|
||
|
||
case CONSTANT:
|
||
++pstacktop;
|
||
++post;
|
||
if ( post == NULL ) {
|
||
++post;
|
||
printf("%.7s bad constant in expression\n",*post);
|
||
break;
|
||
}
|
||
memcpy((void *)pstacktop,post,8);
|
||
post+=7;
|
||
break;
|
||
default:
|
||
printf("%d bad expression element\n",*post);
|
||
break;
|
||
}
|
||
|
||
/* move ahead in postfix expression */
|
||
++post;
|
||
}
|
||
|
||
/* if everything is peachy,the stack should end at its first position */
|
||
if (++top == pstacktop)
|
||
*presult = *pstacktop;
|
||
else
|
||
return(-1);
|
||
return(0);
|
||
}
|
||
|
||
|
||
/*
|
||
* RAND
|
||
*
|
||
* generates a random number between 0 and 1 using the
|
||
* seed = (multy * seed) + addy Random Number Generator by Knuth
|
||
* SemiNumerical Algorithms
|
||
* Chapter 1
|
||
* randy = seed / 65535.0 To normalize the number between 0 - 1
|
||
*/
|
||
static unsigned short seed = 0xa3bf;
|
||
static unsigned short multy = 191 * 8 + 5; /* 191 % 8 == 5 */
|
||
static unsigned short addy = 0x3141;
|
||
static double local_random()
|
||
{
|
||
double randy;
|
||
|
||
/* random number */
|
||
seed = (seed * multy) + addy;
|
||
randy = (float) seed / 65535.0;
|
||
|
||
/* between 0 - 1 */
|
||
return(randy);
|
||
}
|