DBFReadAttribute()

static void* DBFReadAttribute ( DBFHandle  psDBF, int  hEntity, int  iField, char  chReqType  )

static

Definition at line 1017 of file dbfopen.c.

{
    unsigned char       *pabyRec;
    void        *pReturnField = SHPLIB_NULLPTR;
 
/* -------------------------------------------------------------------- */
/*      Verify selection.                                               */
/* -------------------------------------------------------------------- */
    if( hEntity < 0 || hEntity >= psDBF->nRecords )
        return SHPLIB_NULLPTR;
 
    if( iField < 0 || iField >= psDBF->nFields )
        return SHPLIB_NULLPTR;
 
/* -------------------------------------------------------------------- */
/*      Have we read the record?                                        */
/* -------------------------------------------------------------------- */
    if( !DBFLoadRecord( psDBF, hEntity ) )
        return SHPLIB_NULLPTR;
 
    pabyRec = REINTERPRET_CAST(unsigned char *, psDBF->pszCurrentRecord);
 
/* -------------------------------------------------------------------- */
/*      Ensure we have room to extract the target field.                */
/* -------------------------------------------------------------------- */
    if( psDBF->panFieldSize[iField] >= psDBF->nWorkFieldLength )
    {
        psDBF->nWorkFieldLength = psDBF->panFieldSize[iField] + 100;
        if( psDBF->pszWorkField == SHPLIB_NULLPTR )
            psDBF->pszWorkField = STATIC_CAST(char *, malloc(psDBF->nWorkFieldLength));
        else
            psDBF->pszWorkField = STATIC_CAST(char *, realloc(psDBF->pszWorkField,
                                                   psDBF->nWorkFieldLength));
    }
 
/* -------------------------------------------------------------------- */
/*      Extract the requested field.                                    */
/* -------------------------------------------------------------------- */
    memcpy( psDBF->pszWorkField,
             REINTERPRET_CAST(const char *, pabyRec) + psDBF->panFieldOffset[iField],
             psDBF->panFieldSize[iField] );
    psDBF->pszWorkField[psDBF->panFieldSize[iField]] = '\0';
 
    pReturnField = psDBF->pszWorkField;
 
/* -------------------------------------------------------------------- */
/*      Decode the field.                                               */
/* -------------------------------------------------------------------- */
    if( chReqType == 'I' )
    {
        psDBF->fieldValue.nIntField = atoi(psDBF->pszWorkField);
 
        pReturnField = &(psDBF->fieldValue.nIntField);
    }
    else if( chReqType == 'N' )
    {
        psDBF->fieldValue.dfDoubleField = psDBF->sHooks.Atof(psDBF->pszWorkField);
 
        pReturnField = &(psDBF->fieldValue.dfDoubleField);
    }
 
/* -------------------------------------------------------------------- */
/*      Should we trim white space off the string attribute value?      */
/* -------------------------------------------------------------------- */
#ifdef TRIM_DBF_WHITESPACE
    else
    {
        char    *pchSrc, *pchDst;
 
        pchDst = pchSrc = psDBF->pszWorkField;
        while( *pchSrc == ' ' )
            pchSrc++;
 
        while( *pchSrc != '\0' )
            *(pchDst++) = *(pchSrc++);
        *pchDst = '\0';
 
        while( pchDst != psDBF->pszWorkField && *(--pchDst) == ' ' )
            *pchDst = '\0';
    }
#endif
 
    return pReturnField;
}

References SAHooks::Atof, DBFLoadRecord(), DBFInfo::dfDoubleField, DBFInfo::fieldValue, malloc(), DBFInfo::nFields, DBFInfo::nIntField, DBFInfo::nRecords, DBFInfo::nWorkFieldLength, DBFInfo::panFieldOffset, DBFInfo::panFieldSize, DBFInfo::pszCurrentRecord, DBFInfo::pszWorkField, REINTERPRET_CAST, DBFInfo::sHooks, SHPLIB_NULLPTR, and STATIC_CAST.

Referenced by DBFReadDoubleAttribute(), DBFReadIntegerAttribute(), DBFReadLogicalAttribute(), and DBFReadStringAttribute().

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