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67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/*
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* PROJECT: ReactOS Spooler Router
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* LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
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* PURPOSE: Functions related to Ports of the Print Monitors
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* COPYRIGHT: Copyright 2015-2017 Colin Finck (colin@reactos.org)
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*/
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#include "precomp.h"
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BOOL WINAPI
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EnumPortsW(PWSTR pName, DWORD Level, PBYTE pPorts, DWORD cbBuf, PDWORD pcbNeeded, PDWORD pcReturned)
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{
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BOOL bReturnValue = TRUE;
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DWORD cbCallBuffer;
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DWORD cbNeeded;
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DWORD dwReturned;
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PBYTE pCallBuffer;
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PSPOOLSS_PRINT_PROVIDER pPrintProvider;
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PLIST_ENTRY pEntry;
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// Sanity checks.
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if (cbBuf && !pPorts)
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{
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SetLastError(ERROR_INVALID_USER_BUFFER);
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return FALSE;
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}
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// Begin counting.
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*pcbNeeded = 0;
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*pcReturned = 0;
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// At the beginning, we have the full buffer available.
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cbCallBuffer = cbBuf;
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pCallBuffer = pPorts;
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// Loop through all Print Provider.
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for (pEntry = PrintProviderList.Flink; pEntry != &PrintProviderList; pEntry = pEntry->Flink)
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{
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pPrintProvider = CONTAINING_RECORD(pEntry, SPOOLSS_PRINT_PROVIDER, Entry);
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// Call the EnumPorts function of this Print Provider.
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cbNeeded = 0;
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dwReturned = 0;
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bReturnValue = pPrintProvider->PrintProvider.fpEnumPorts(pName, Level, pCallBuffer, cbCallBuffer, &cbNeeded, &dwReturned);
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// Add the returned counts to the total values.
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*pcbNeeded += cbNeeded;
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*pcReturned += dwReturned;
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// Reduce the available buffer size for the next call without risking an underflow.
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if (cbNeeded < cbCallBuffer)
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cbCallBuffer -= cbNeeded;
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else
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cbCallBuffer = 0;
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// Advance the buffer if the caller provided it.
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if (pCallBuffer)
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pCallBuffer += cbNeeded;
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// Check if we shall not ask other Print Providers.
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if (bReturnValue == ROUTER_STOP_ROUTING)
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break;
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}
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return bReturnValue;
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}
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