The Tor Browser: widget/gtk/nsCUPSShim.cpp@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

     2 /* ex: set tabstop=8 softtabstop=4 shiftwidth=4 expandtab: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #include "nsDebug.h"

     8 #include "nsString.h"

     9 #include "nsCUPSShim.h"

    10 #include "mozilla/ArrayUtils.h"

    11 #include "prlink.h"

    14 // List of symbols to find in libcups. Must match symAddr[] defined in Init().

    15 // Making this an array of arrays instead of pointers allows storing the

    16 // whole thing in read-only memory.

    17 static const char gSymName[][sizeof("cupsPrintFile")] = {

    18     { "cupsAddOption" },

    19     { "cupsFreeDests" },

    20     { "cupsGetDest" },

    21     { "cupsGetDests" },

    22     { "cupsPrintFile" },

    23     { "cupsTempFd" },

    24 };

    25 static const int gSymNameCt = mozilla::ArrayLength(gSymName);

    28 bool

    29 nsCUPSShim::Init()

    30 {

    31     mCupsLib = PR_LoadLibrary("libcups.so.2");

    32     if (!mCupsLib)

    33         return false;

    35     // List of symbol pointers. Must match gSymName[] defined above.

    36     void **symAddr[] = {

    37         (void **)&mCupsAddOption,

    38         (void **)&mCupsFreeDests,

    39         (void **)&mCupsGetDest,

    40         (void **)&mCupsGetDests,

    41         (void **)&mCupsPrintFile,

    42         (void **)&mCupsTempFd,

    43     };

    45     for (int i = gSymNameCt; i--; ) {

    46         *(symAddr[i]) = PR_FindSymbol(mCupsLib, gSymName[i]);

    47         if (! *(symAddr[i])) {

    48 #ifdef DEBUG

    49             nsAutoCString msg(gSymName[i]);

    50             msg.Append(" not found in CUPS library");

    51             NS_WARNING(msg.get());

    52 #endif

    53             PR_UnloadLibrary(mCupsLib);

    54             mCupsLib = nullptr;

    55             return false;

    56         }

    57     }

    58     return true;

    59 }

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