michael@0: /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* ex: set tabstop=8 softtabstop=4 shiftwidth=4 expandtab: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "nsDebug.h"
michael@0: #include "nsString.h"
michael@0: #include "nsCUPSShim.h"
michael@0: #include "mozilla/ArrayUtils.h"
michael@0: #include "prlink.h"
michael@0: 
michael@0: 
michael@0: // List of symbols to find in libcups. Must match symAddr[] defined in Init().
michael@0: // Making this an array of arrays instead of pointers allows storing the
michael@0: // whole thing in read-only memory.
michael@0: static const char gSymName[][sizeof("cupsPrintFile")] = {
michael@0:     { "cupsAddOption" },
michael@0:     { "cupsFreeDests" },
michael@0:     { "cupsGetDest" },
michael@0:     { "cupsGetDests" },
michael@0:     { "cupsPrintFile" },
michael@0:     { "cupsTempFd" },
michael@0: };
michael@0: static const int gSymNameCt = mozilla::ArrayLength(gSymName);
michael@0: 
michael@0: 
michael@0: bool
michael@0: nsCUPSShim::Init()
michael@0: {
michael@0:     mCupsLib = PR_LoadLibrary("libcups.so.2");
michael@0:     if (!mCupsLib)
michael@0:         return false;
michael@0: 
michael@0:     // List of symbol pointers. Must match gSymName[] defined above.
michael@0:     void **symAddr[] = {
michael@0:         (void **)&mCupsAddOption,
michael@0:         (void **)&mCupsFreeDests,
michael@0:         (void **)&mCupsGetDest,
michael@0:         (void **)&mCupsGetDests,
michael@0:         (void **)&mCupsPrintFile,
michael@0:         (void **)&mCupsTempFd,
michael@0:     };
michael@0: 
michael@0:     for (int i = gSymNameCt; i--; ) {
michael@0:         *(symAddr[i]) = PR_FindSymbol(mCupsLib, gSymName[i]);
michael@0:         if (! *(symAddr[i])) {
michael@0: #ifdef DEBUG
michael@0:             nsAutoCString msg(gSymName[i]);
michael@0:             msg.Append(" not found in CUPS library");
michael@0:             NS_WARNING(msg.get());
michael@0: #endif
michael@0:             PR_UnloadLibrary(mCupsLib);
michael@0:             mCupsLib = nullptr;
michael@0:             return false;
michael@0:         }
michael@0:     }
michael@0:     return true;
michael@0: }