Variable Reference (Scilab gateway)

How to get the address of an argument or a variable in a gateway.

Calling Sequence

Input argument profile:

SciErr getVarAddressFromPosition(void* _pvCtx, int _iVar, int** _piAddress)

Named variable profile:

SciErr getVarAddressFromName(void* _pvCtx, const char* _pstName, int** _piAddress)

Arguments

:_pvCtx Scilab environment pointer, pass in “pvApiCtx” provided by

api_scilab.h

: :_iVar Position of the argument in the function call. : :_pstName Scilab variable name. : :_piAddress Return address of the Scilab variable. : :SciErr Error structure where is stored errors messages history and

first error number.

:

Description

This function retrieves the address of an argument in a gateway.

Gateway Source

#include "api_scilab.h"
SciErr printf_info(int _iVar);

int common_function(char *fname,unsigned long fname_len)
{
    SciErr sciErr;
    int i;
    int *piAddr1    = NULL;
    int iBool       = 0;

    for(i = 0 ; i < nbInputArgument ; i++)
    {
        sciErr = printf_info(i + 1);
        if(sciErr.iErr)
        {
            printError(&sciErr, 0);
            break;
        }
        sciprint("\n\n");
    }

    //1 for true, 0 for false
    iBool = sciErr.iErr == 0 ? 1 : 0;

    sciErr = createMatrixOfBoolean(pvApiCtx, nbInputArgument + 1, 1, 1, &iBool);
    if(sciErr.iErr)
    {
        printError(&sciErr, 0);
        return 0;
    }

    //assign allocated variables to Lhs position
    AssignOutputVariable(1) = nbInputArgument + 1;
    return 0;
}
SciErr printf_info(int _iVar)
{
    SciErr sciErr;
    int* piAddr     = NULL;
    int iType       = 0;
    int iRows       = 0;
    int iCols       = 0;
    int iItem       = 0;
    int iComplex    = 0;

    sciErr = getVarAddressFromPosition(pvApiCtx, _iVar, &piAddr);
    if(sciErr.iErr)
    {
        return sciErr;
    }

    sciprint("Variable %d information:\n", _iVar);

    sciErr = getVarType(pvApiCtx, piAddr, &iType);
    if(sciErr.iErr)
    {
        return sciErr;
    }

    sciprint("\tType: ");
    switch(iType)
    {
        case sci_matrix :
            sciprint("double\n");
            break;
        case sci_poly :
            sciprint("polynomial\n");
            break;
        case sci_boolean :
            sciprint("boolean\n");
            break;
        case sci_sparse :
            sciprint("sparse\n");
            break;
        case sci_boolean_sparse :
            sciprint("boolean_sparse\n");
            break;
        case sci_ints :
        {
            char pstSigned[]    = "signed";
            char pstUnsigned[]  = "unsigned";
            char* pstSign       = pstSigned;
            int iPrec           = 0;

            sciErr = getMatrixOfIntegerPrecision(pvApiCtx, piAddr, &iPrec);
            if(sciErr.iErr)
            {
                return sciErr;
            }

            if(iPrec > 10)
            {
                pstSign = pstUnsigned;
            }

            sciprint("%s integer %d bits\n", pstSign, (iPrec % 10) * 8);
        }
        break;
        case sci_strings :
            sciprint("strings\n");
            break;
        case sci_list :
            sciprint("list\n");
            break;
        case sci_tlist :
            sciprint("tlist\n");
            break;
        case sci_mlist :
            sciprint("mlist\n");
            break;
        default :
            sciprint("Not manage by this function\n");
            return sciErr;
    }

    if(isVarComplex(pvApiCtx, piAddr))
    {
        sciprint("\tComplex: Yes\n");
    }

    sciprint("\tDimensions: ");
    if(isVarMatrixType(pvApiCtx, piAddr))
    {
        sciErr = getVarDimension(pvApiCtx, piAddr, &iRows, &iCols);
        if(sciErr.iErr)
        {
            return sciErr;
        }

        sciprint("%d x %d", iRows, iCols);
    }
    else
    {
        sciErr = getListItemNumber(pvApiCtx, piAddr, &iItem);
        if(sciErr.iErr)
        {
            return sciErr;
        }

        sciprint("%d", iItem);
    }
    return sciErr;
}

Scilab test script

l1 = [1,2*%i,3;%i,2,3*%i];
l2 = ["may","the";"puffin","be";"with","you"];
l3 = `int8`_([1,2,3]);
l4 = `uint16`_([1000,2000,3000]);
l5 = `list`_(l1,l2,l3);
l = `list`_(l1,l2,l3,l4,l5);
common_function(l(1:$))