www.pudn.com > snmp.rar > vbl.c

/*++ 
 
Copyright (c) 1992-1997  Microsoft Corporation 
 
Module Name: 
 
    vbl.c 
 
Abstract: 
 
    Contains routines to manipulate variable binding lists. 
 
        SnmpUtilVarBindListCpy 
        SnmpUtilVarBindListFree 
 
Environment: 
 
    User Mode - Win32 
 
Revision History: 
 
--*/ 
 
/////////////////////////////////////////////////////////////////////////////// 
//                                                                           // 
// Include files                                                             // 
//                                                                           // 
/////////////////////////////////////////////////////////////////////////////// 
 
#include  
#include  
 
 
/////////////////////////////////////////////////////////////////////////////// 
//                                                                           // 
// Public Procedures                                                         // 
//                                                                           // 
/////////////////////////////////////////////////////////////////////////////// 
 
SNMPAPI 
SNMP_FUNC_TYPE  
SnmpUtilVarBindListCpy( 
    SnmpVarBindList * pVblDst,  
    SnmpVarBindList * pVblSrc   
    ) 
 
/*++ 
 
Routine Description: 
 
    Copies a variable binding list. 
 
Arguments: 
 
    pVblDst - pointer to structure to receive VarBindList. 
 
    pVblSrc - pointer to VarBindList to copy. 
 
Return Values: 
 
    Returns SNMPAPI_NOERROR if successful.  
 
--*/ 
 
{ 
    UINT i; 
    SNMPAPI nResult = SNMPAPI_ERROR; 
 
    // validate pointer  
    if (pVblDst != NULL) { 
 
        // initialize 
        pVblDst->list = NULL; 
        pVblDst->len  = 0; 
 
        // check for varbinds     
        if ((pVblSrc != NULL) && 
            (pVblSrc->list != NULL) && 
            (pVblSrc->len != 0)) { 
 
            // attempt to allocate varbinds 
            pVblDst->list = SnmpUtilMemAlloc( 
                                pVblSrc->len * sizeof(SnmpVarBind) 
                                ); 
 
            // validate pointer 
            if (pVblDst->list != NULL) { 
 
                // loop through the varbinds 
                for (i = 0; i < pVblSrc->len; i++) { 
 
                    // copy individual varbind 
                    nResult = SnmpUtilVarBindCpy(    
                                    &pVblDst->list[i],  
                                    &pVblSrc->list[i] 
                                    ); 
 
                    // validate return code 
                    if (nResult == SNMPAPI_NOERROR) {             
 
                        // increment 
                        pVblDst->len++; // success... 
                         
                    } else { 
             
                        break; // failure...     
                    } 
                } 
             
            } else { 
             
                SNMPDBG(( 
                    SNMP_LOG_ERROR, 
                    "SNMP: API: could not allocate varbinds.\n" 
                    )); 
 
                SetLastError(SNMP_MEM_ALLOC_ERROR); 
            } 
 
        } else { 
 
            SNMPDBG(( 
                SNMP_LOG_WARNING, 
                "SNMP: API: copying null varbindlist.\n" 
                )); 
         
            nResult = SNMPAPI_NOERROR; // success.., 
        } 
 
    } else { 
 
        SNMPDBG(( 
            SNMP_LOG_ERROR, 
            "SNMP: API: null varbindlist pointer.\n" 
            )); 
     
        SetLastError(ERROR_INVALID_PARAMETER); 
    } 
 
    // make sure we cleanup     
    if (nResult == SNMPAPI_ERROR) { 
 
        // release new varbinds 
        SnmpUtilVarBindListFree(pVblDst); 
    } 
 
    return nResult; 
} 
 
 
VOID 
SNMP_FUNC_TYPE  
SnmpUtilVarBindListFree( 
    SnmpVarBindList * pVbl 
    ) 
 
/*++ 
 
Routine Description: 
 
    Frees memory associated with variable binding list. 
 
Arguments: 
 
    pVbl - pointer to VarBindList to free. 
 
Return Values: 
 
    None.  
 
--*/ 
 
{ 
    UINT i; 
 
    // loop throught varbinds 
    for (i = 0; i < pVbl->len; i++) { 
 
        // release individual varbind 
        SnmpUtilVarBindFree(&pVbl->list[i]); 
    } 
 
    // release actual list 
    SnmpUtilMemFree(pVbl->list); 
 
    // re-initialize 
    pVbl->list = NULL; 
    pVbl->len  = 0; 
}