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Scilab Help >> API Scilab > legacy > List manipulation > Pointer reading (Scilab gateway)

Pointer reading (Scilab gateway)

How to read pointer in a list.

Syntax

Input argument profile:

SciErr getPointerInList(void* _pvCtx, int* _piParent, int _iItemPos, void** _pvPtr)

Named variable profile:

SciErr readPointerInNamedList(void* _pvCtx, const char* _pstName, int* _piParent, int _iItemPos, void** _pvPtr)

Arguments

_pvCtx: Scilab environment pointer, pass in "pvApiCtx" provided by api_scilab.h.
_iVar: Position in the Scilab memory where you want to put the variable.
_pstName: Name of the variable for "named" functions.
_piParent: Address of the parent of the new item.
_iItemPos: Position of the new item in the list.
_pvPtr: Return pointer on data.
SciErr: Error structure where is stored errors messages history and first error number.

Description

This help describes how to read pointer in a list.

Gateway Source

#include "api_scilab.h"

static int iTab = 0;
void insert_indent(void)
{
	int i = 0;
	for(i = 0 ; i < iTab ; i++)
	{
		sciprint("\t");
	}
}

int get_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos);
int get_list_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos);
int get_double_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos);
int get_poly_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos);
int get_boolean_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos);
int get_sparse_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos);
int get_bsparse_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos);
int get_integer_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos);
int get_string_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos);
int get_pointer_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos);

int common_read(char *fname,void* pvApiCtx)
{
	SciErr sciErr;
	int iItem       = 0;
	int iRet        = 0;
	int *piAddr     = NULL;

	CheckInputArgument(pvApiCtx, 1, 1);

	sciErr = getVarAddressFromPosition(pvApiCtx, 1, &piAddr);
	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	get_info(1, NULL, piAddr, 0);
	AssignOutputVariable(pvApiCtx, 1) = 0;
	return 0;
}

int get_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos)
{
	SciErr sciErr;
	int iRet    = 0;
	int iType   = 0;

	sciErr = getVarType(pvApiCtx, _piAddr, &iType);
	switch(iType)
	{
	case sci_matrix :
		iRet = get_double_info(_iRhs, _piParent, _piAddr, _iItemPos);
		break;
	case sci_poly :
		iRet = get_poly_info(_iRhs, _piParent, _piAddr, _iItemPos);
		break;
	case sci_boolean :
		iRet = get_boolean_info(_iRhs, _piParent, _piAddr, _iItemPos);
		break;
	case sci_sparse :
		iRet = get_sparse_info(_iRhs, _piParent, _piAddr, _iItemPos);
		break;
	case sci_boolean_sparse :
		iRet = get_bsparse_info(_iRhs, _piParent, _piAddr, _iItemPos);
		break;
	case sci_ints :
		iRet = get_integer_info(_iRhs, _piParent, _piAddr, _iItemPos);
		break;
	case sci_strings :
		iRet = get_string_info(_iRhs, _piParent, _piAddr, _iItemPos);
		break;
	case sci_list :
		insert_indent();
		sciprint("List ");
		iRet = get_list_info(_iRhs, _piParent, _piAddr, _iItemPos);
		break;
	case sci_tlist :
		insert_indent();
		sciprint("TList ");
		iRet = get_list_info(_iRhs, _piParent, _piAddr, _iItemPos);
		break;
	case sci_mlist :
		insert_indent();
		sciprint("MList ");
		iRet = get_list_info(_iRhs, _piParent, _piAddr, _iItemPos);
		break;
	case sci_pointer :
		iRet = get_pointer_info(_iRhs, _piParent, _piAddr, _iItemPos);
		break;
	default :
		insert_indent();
		sciprint("Unknown type\n");
		return 1;
	}
	return iRet;
}

int get_list_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos)
{
	SciErr sciErr;
	int i;
	int iRet        = 0;
	int iItem       = 0;
	int* piChild    = NULL;

	sciErr = getListItemNumber(pvApiCtx, _piAddr, &iItem);
	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	sciprint("(%d)\n", iItem);
	for(i = 0 ; i < iItem ; i++)
	{
		sciErr = getListItemAddress(pvApiCtx, _piAddr, i + 1, &piChild);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		iTab++;
		iRet = get_info(_iRhs, _piAddr, piChild, i + 1);
		iTab--;
	}
	return 0;;
}

int get_double_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos)
{
	SciErr sciErr;
	int iRows           = 0;
	int iCols           = 0;
	double* pdblReal    = NULL;
	double* pdblImg     = NULL;

	if(_iItemPos == 0)
	{//not in list
		if(isVarComplex(pvApiCtx, _piAddr))
		{
			sciErr = getComplexMatrixOfDouble(pvApiCtx, _piAddr, &iRows, &iCols, &pdblReal, &pdblImg);
		}
		else
		{
			sciErr = getMatrixOfDouble(pvApiCtx, _piAddr, &iRows, &iCols, &pdblReal);
		}
	}
	else
	{
		if(isVarComplex(pvApiCtx, _piAddr))
		{
			sciErr = getComplexMatrixOfDoubleInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, &pdblReal, &pdblImg);
		}
		else
		{
			sciErr = getMatrixOfDoubleInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, &pdblReal);
		}
	}

	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	insert_indent();
	sciprint("Double (%d x %d)\n", iRows, iCols);
	return 0;;
}

int get_poly_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos)
{
	SciErr sciErr;
	int i;
	int iLen            = 0;
	int iRows           = 0;
	int iCols           = 0;
	char pstVar[16];
	int* piCoeff        = NULL;
	double** pdblReal   = NULL;
	double** pdblImg    = NULL;

	sciErr = getPolyVariableName(pvApiCtx, _piAddr, pstVar, &iLen);
	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	if(_iItemPos == 0)
	{//not in list
		sciErr = getMatrixOfPoly(pvApiCtx, _piAddr, &iRows, &iCols, NULL, NULL);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		piCoeff     = (int*)malloc(sizeof(int) * iRows * iCols);
		sciErr = getMatrixOfPoly(pvApiCtx, _piAddr, &iRows, &iCols, piCoeff, NULL);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		pdblReal    = (double**)malloc(sizeof(double*) * iRows * iCols);
		pdblImg     = (double**)malloc(sizeof(double*) * iRows * iCols);

		for(i = 0 ; i < iRows * iCols ; i++)
		{
			pdblReal[i] = (double*)malloc(sizeof(double) * piCoeff[i]);
			pdblImg[i]  = (double*)malloc(sizeof(double) * piCoeff[i]);
		}

		if(isVarComplex(pvApiCtx, _piAddr))
		{
			sciErr = getComplexMatrixOfPoly(pvApiCtx, _piAddr, &iRows, &iCols, piCoeff, pdblReal, pdblImg);
			if(sciErr.iErr)
			{
				printError(&sciErr, 0);
				return 0;
			}
		}
		else
		{
			sciErr = getMatrixOfPoly(pvApiCtx, _piAddr, &iRows, &iCols, piCoeff, pdblReal);
			if(sciErr.iErr)
			{
				printError(&sciErr, 0);
				return 0;
			}
		}
	}
	else
	{
		sciErr = getMatrixOfPolyInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, NULL, NULL);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		piCoeff = (int*)malloc(sizeof(int) * iRows * iCols);

		sciErr = getMatrixOfPolyInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, piCoeff, NULL);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		pdblReal    = (double**)malloc(sizeof(double*) * iRows * iCols);
		pdblImg     = (double**)malloc(sizeof(double*) * iRows * iCols);

		for(i = 0 ; i < iRows * iCols ; i++)
		{
			pdblReal[i] = (double*)malloc(sizeof(double) * piCoeff[i]);
			pdblImg[i]  = (double*)malloc(sizeof(double) * piCoeff[i]);
		}

		if(isVarComplex(pvApiCtx, _piAddr))
		{
			sciErr = getComplexMatrixOfPolyInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, piCoeff, pdblReal, pdblImg);
		}
		else
		{
			sciErr = getMatrixOfPolyInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, piCoeff, pdblReal);
		}
	}

	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	insert_indent();
	sciprint("Poly  (%d x %d), varname : \'%s\'\n", iRows, iCols, pstVar);

	for(i = 0 ; i < iRows * iCols ; i++)
	{
		free(pdblReal[i]);
		free(pdblImg[i]);
	}

	free(pdblReal);
	free(pdblImg);
	free(piCoeff);
	return 0;;
}
int get_boolean_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos)
{
	SciErr sciErr;
	int iRows       = 0;
	int iCols       = 0;
	int* piBool     = NULL;

	if(_iItemPos == 0)
	{
		sciErr = getMatrixOfBoolean(pvApiCtx, _piAddr, &iRows, &iCols, &piBool);
	}
	else
	{
		sciErr = getMatrixOfBooleanInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, &piBool);
	}

	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	insert_indent();
	sciprint("Boolean (%d x %d)\n", iRows, iCols);
	return 0;
}
int get_sparse_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos)
{
	SciErr sciErr;
	int iRows           = 0;
	int iCols           = 0;
	int iItem           = 0;
	int* piNbRow        = NULL;
	int* piColPos       = NULL;
	double* pdblReal    = NULL;
	double* pdblImg     = NULL;

	if(_iItemPos == 0)
	{//Not in list
		if(isVarComplex(pvApiCtx, _piAddr))
		{
			sciErr = getComplexSparseMatrix(pvApiCtx, _piAddr, &iRows, &iCols, &iItem, &piNbRow, &piColPos, &pdblReal, &pdblImg);
		}
		else
		{
			sciErr = getSparseMatrix(pvApiCtx, _piAddr, &iRows, &iCols, &iItem, &piNbRow, &piColPos, &pdblReal);
		}
	}
	else
	{
		if(isVarComplex(pvApiCtx, _piAddr))
		{
			sciErr = getComplexSparseMatrixInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, &iItem, &piNbRow, &piColPos, &pdblReal, &pdblImg);
		}
		else
		{
			sciErr = getSparseMatrixInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, &iItem, &piNbRow, &piColPos, &pdblReal);
		}
	}

	insert_indent();
	sciprint("Sparse (%d x %d), Item(s) : %d \n", iRows, iCols, iItem);
	return 0;;
}

int get_bsparse_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos)
{
	SciErr sciErr;
	int iRows       = 0;
	int iCols       = 0;
	int iItem       = 0;
	int* piNbRow    = NULL;
	int* piColPos   = NULL;

	if(_iItemPos == 0)
	{//Not in list
		sciErr = getBooleanSparseMatrix(pvApiCtx, _piAddr, &iRows, &iCols, &iItem, &piNbRow, &piColPos);
	}
	else
	{
		sciErr = getBooleanSparseMatrixInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, &iItem, &piNbRow, &piColPos);
	}

	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	insert_indent();
	sciprint("Boolean Sparse (%d x %d), Item(s) : %d \n", iRows, iCols, iItem);
	return 0;;
}
int get_integer_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos)
{
	SciErr sciErr;
	int iPrec               = 0;
	int iRows               = 0;
	int iCols               = 0;
	char* pcData            = NULL;
	short* psData           = NULL;
	int* piData             = NULL;
	unsigned char* pucData  = NULL;
	unsigned short* pusData = NULL;
	unsigned int* puiData   = NULL;

	if(_iItemPos == 0)
	{//Not in list
		sciErr = getMatrixOfIntegerPrecision(pvApiCtx, _piAddr, &iPrec);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		switch(iPrec)
		{
		case SCI_INT8 :
			sciErr = getMatrixOfInteger8(pvApiCtx, _piAddr, &iRows, &iCols, &pcData);
			break;
		case SCI_INT16 :
			sciErr = getMatrixOfInteger16(pvApiCtx, _piAddr, &iRows, &iCols, &psData);
			break;
		case SCI_INT32 :
			sciErr = getMatrixOfInteger32(pvApiCtx, _piAddr, &iRows, &iCols, &piData);
			break;
		case SCI_UINT8 :
			sciErr = getMatrixOfUnsignedInteger8(pvApiCtx, _piAddr, &iRows, &iCols, &pucData);
			break;
		case SCI_UINT16 :
			sciErr = getMatrixOfUnsignedInteger16(pvApiCtx, _piAddr, &iRows, &iCols, &pusData);
			break;
		case SCI_UINT32 :
			sciErr = getMatrixOfUnsignedInteger32(pvApiCtx, _piAddr, &iRows, &iCols, &puiData);
			break;
		default :
			return 1;
		}
	}
	else
	{
		sciErr = getMatrixOfIntegerPrecision(pvApiCtx, _piAddr, &iPrec);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		switch(iPrec)
		{
		case SCI_INT8 :
			sciErr = getMatrixOfInteger8InList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, &pcData);
			break;
		case SCI_INT16 :
			sciErr = getMatrixOfInteger16InList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, &psData);
			break;
		case SCI_INT32 :
			sciErr = getMatrixOfInteger32InList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, &piData);
			break;
		case SCI_UINT8 :
			sciErr = getMatrixOfUnsignedInteger8InList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, &pucData);
			break;
		case SCI_UINT16 :
			sciErr = getMatrixOfUnsignedInteger16InList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, &pusData);
			break;
		case SCI_UINT32 :
			sciErr = getMatrixOfUnsignedInteger32InList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, &puiData);
			break;
		default :
			return 1;
		}
	}

	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	insert_indent();

	if(iPrec > 10)
	{
		sciprint("Unsigned ");
	}

	sciprint("Integer %d bits (%d x %d)\n", (iPrec % 10) * 8, iRows, iCols);
	return 0;;
}
int get_string_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos)
{
	SciErr sciErr;
	int i;
	int iRows       = 0;
	int iCols       = 0;
	int* piLen      = NULL;
	char **pstData  = NULL;

	if(_iItemPos == 0)
	{//Not in list
		sciErr = getMatrixOfString(pvApiCtx, _piAddr, &iRows, &iCols, NULL, NULL);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		piLen = (int*)malloc(sizeof(int) * iRows * iCols);
		sciErr = getMatrixOfString(pvApiCtx, _piAddr, &iRows, &iCols, piLen, NULL);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		pstData = (char**)malloc(sizeof(char*) * iRows * iCols);

		for(i = 0 ; i < iRows * iCols ; i++)
		{
			pstData[i] = (char*)malloc(sizeof(char) * (piLen[i] + 1));//+ 1 for null termination
		}

		sciErr = getMatrixOfString(pvApiCtx, _piAddr, &iRows, &iCols, piLen, pstData);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}
	}
	else
	{
		sciErr = getMatrixOfStringInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, NULL, NULL);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		piLen = (int*)malloc(sizeof(int) * iRows * iCols);

		sciErr = getMatrixOfStringInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, piLen, NULL);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		pstData = (char**)malloc(sizeof(char*) * iRows * iCols);

		for(i = 0 ; i < iRows * iCols ; i++)
		{
			pstData[i] = (char*)malloc(sizeof(char) * (piLen[i] + 1));//+ 1 for null termination
		}

		sciErr = getMatrixOfStringInList(pvApiCtx, _piParent, _iItemPos, &iRows, &iCols, piLen, pstData);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}
	}
	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	insert_indent();
	sciprint("Strings (%d x %d)\n", iRows, iCols);
	return 0;;
}
int get_pointer_info(int _iRhs, int* _piParent, int *_piAddr, int _iItemPos)
{
	SciErr sciErr;
	void* pvPtr     = NULL;

	if(_iItemPos == 0)
	{
		sciErr = getPointer(pvApiCtx, _piAddr, &pvPtr);
	}
	else
	{
		sciErr = getPointerInList(pvApiCtx, _piParent, _iItemPos, &pvPtr);
	}

	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	insert_indent();
	sciprint("Pointer : 0x%08X\n", pvPtr);
	return 0;
}

Scilab test script

function read_all()
d = [1,2,3;4,5,6;7,8,9];common_read(d);
s=poly(0,"x");p=1+s+2*s^2;p = [(p * 2),(p * s + 3);(p * 2 * s ** 2 - 6),(12 - 4 * p * (- s) ** 2)];common_read(p);
b = [%t,%f;%t,%f;%f,%t];common_read(b);
sp=sparse([2,-1,0,0,0;-1,2,-1,0,0;0,-1,2,-1,0;0,0,-1,2,-1;0,0,0,-1,2]);common_read(sp);
bsp=sparse([1,2;4,5;3,10],[%t,%t,%t]);common_read(bsp);
i8 = int8([1,2,3]);common_read(i8);
ui32 = uint32([3;2;1]);common_read(ui32);
str = ["may", "the", "puffin"; "be", "with","you"];common_read(str);
if with_module('umfpack') then
    Cp = taucs_chfact(sp);
    l = list(list(d, p, list(b, sp)), list(i8, bsp), list(ui32, str), Cp);
else
    l = list(list(d, p, list(b, sp)), list(i8, bsp), list(ui32, str));
end
common_read(l)
endfunction
read_all;

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Copyright (c) 2011-2017 (Scilab Enterprises)
Copyright (c) 1989-2012 (INRIA)
Copyright (c) 1989-2007 (ENPC)
with contributors

Last updated:
Thu Feb 14 14:57:46 CET 2019