зеркало из https://github.com/mozilla/gecko-dev.git
60 строки
1.7 KiB
C++
60 строки
1.7 KiB
C++
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ex: set tabstop=8 softtabstop=4 shiftwidth=4 expandtab: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsDebug.h"
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#include "nsString.h"
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#include "nsCUPSShim.h"
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#include "mozilla/ArrayUtils.h"
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#include "prlink.h"
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// List of symbols to find in libcups. Must match symAddr[] defined in Init().
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// Making this an array of arrays instead of pointers allows storing the
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// whole thing in read-only memory.
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static const char gSymName[][sizeof("cupsPrintFile")] = {
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{ "cupsAddOption" },
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{ "cupsFreeDests" },
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{ "cupsGetDest" },
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{ "cupsGetDests" },
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{ "cupsPrintFile" },
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{ "cupsTempFd" },
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};
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static const int gSymNameCt = mozilla::ArrayLength(gSymName);
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bool
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nsCUPSShim::Init()
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{
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mCupsLib = PR_LoadLibrary("libcups.so.2");
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if (!mCupsLib)
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return false;
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// List of symbol pointers. Must match gSymName[] defined above.
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void **symAddr[] = {
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(void **)&mCupsAddOption,
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(void **)&mCupsFreeDests,
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(void **)&mCupsGetDest,
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(void **)&mCupsGetDests,
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(void **)&mCupsPrintFile,
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(void **)&mCupsTempFd,
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};
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for (int i = gSymNameCt; i--; ) {
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*(symAddr[i]) = PR_FindSymbol(mCupsLib, gSymName[i]);
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if (! *(symAddr[i])) {
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#ifdef DEBUG
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nsAutoCString msg(gSymName[i]);
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msg.Append(" not found in CUPS library");
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NS_WARNING(msg.get());
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#endif
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PR_UnloadLibrary(mCupsLib);
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mCupsLib = nullptr;
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return false;
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}
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}
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return true;
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}
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