DBFReadAttribute()

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

static

Definition at line 961 of file dbfopen.c.

References DBFLoadRecord(), malloc(), and SHPAPI_CALL.

Referenced by DBFReadDoubleAttribute(), and DBFReadIntegerAttribute().

{
    unsigned char       *pabyRec;
    void        *pReturnField = NULL;

/* -------------------------------------------------------------------- */
/*      Verify selection.                                               */
/* -------------------------------------------------------------------- */
    if( hEntity < 0 || hEntity >= psDBF->nRecords )
        return( NULL );

    if( iField < 0 || iField >= psDBF->nFields )
        return( NULL );

/* -------------------------------------------------------------------- */
/*      Have we read the record?                                        */
/* -------------------------------------------------------------------- */
    if( !DBFLoadRecord( psDBF, hEntity ) )
        return NULL;

    pabyRec = (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 == NULL )
            psDBF->pszWorkField = (char *) malloc(psDBF->nWorkFieldLength);
        else
            psDBF->pszWorkField = (char *) realloc(psDBF->pszWorkField,
                                                   psDBF->nWorkFieldLength);
    }

/* -------------------------------------------------------------------- */
/*      Extract the requested field.                                    */
/* -------------------------------------------------------------------- */
    strncpy( psDBF->pszWorkField,
             ((const char *) pabyRec) + psDBF->panFieldOffset[iField],
             psDBF->panFieldSize[iField] );
    psDBF->pszWorkField[psDBF->panFieldSize[iField]] = '\0';

    pReturnField = psDBF->pszWorkField;

/* -------------------------------------------------------------------- */
/*      Decode the field.                                               */
/* -------------------------------------------------------------------- */
    if( chReqType == 'N' )
    {
        psDBF->dfDoubleField = psDBF->sHooks.Atof(psDBF->pszWorkField);

        pReturnField = &(psDBF->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 );
}

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