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