/* * PROJECT: ReactOS Local Spooler * LICENSE: GNU LGPL v2.1 or any later version as published by the Free Software Foundation * PURPOSE: Functions related to Ports of the Print Monitors * COPYRIGHT: Copyright 2015 Colin Finck */ #include "precomp.h" BOOL WINAPI LocalEnumPorts(PWSTR pName, DWORD Level, PBYTE pPorts, DWORD cbBuf, PDWORD pcbNeeded, PDWORD pcReturned) { BOOL bReturnValue; DWORD cbCallBuffer; DWORD cbNeeded; DWORD dwReturned; PBYTE pCallBuffer; PLOCAL_PRINT_MONITOR pPrintMonitor; PLIST_ENTRY pEntry; // Sanity checks. if ((cbBuf && !pPorts) || !pcbNeeded || !pcReturned) { SetLastError(ERROR_INVALID_PARAMETER); return FALSE; } // Begin counting. *pcbNeeded = 0; *pcReturned = 0; // At the beginning, we have the full buffer available. cbCallBuffer = cbBuf; pCallBuffer = pPorts; // Loop through all Print Monitors. for (pEntry = PrintMonitorList.Flink; pEntry != &PrintMonitorList; pEntry = pEntry->Flink) { pPrintMonitor = CONTAINING_RECORD(pEntry, LOCAL_PRINT_MONITOR, Entry); // Call the EnumPorts function of this Print Monitor. if (pPrintMonitor->bIsLevel2) bReturnValue = ((PMONITOR2)pPrintMonitor->pMonitor)->pfnEnumPorts(pPrintMonitor->hMonitor, pName, Level, pCallBuffer, cbCallBuffer, &cbNeeded, &dwReturned); else bReturnValue = ((LPMONITOREX)pPrintMonitor->pMonitor)->Monitor.pfnEnumPorts(pName, Level, pCallBuffer, cbCallBuffer, &cbNeeded, &dwReturned); // Add the returned counts to the total values. *pcbNeeded += cbNeeded; *pcReturned += dwReturned; // Reduce the available buffer size for the next call without risking an underflow. if (cbNeeded < cbCallBuffer) cbCallBuffer -= cbNeeded; else cbCallBuffer = 0; // Advance the buffer if the caller provided it. if (pCallBuffer) pCallBuffer += cbNeeded; } return bReturnValue; }