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

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

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

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

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

#include "nsDebug.h"

#include "nsString.h"

#include "nsCUPSShim.h"

#include "mozilla/ArrayUtils.h"

#include "prlink.h"

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

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

// whole thing in read-only memory.

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

    { "cupsAddOption" },

    { "cupsFreeDests" },

    { "cupsGetDest" },

    { "cupsGetDests" },

    { "cupsPrintFile" },

    { "cupsTempFd" },

};

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

bool

nsCUPSShim::Init()

{

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

    if (!mCupsLib)

        return false;

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

    void **symAddr[] = {

        (void **)&mCupsAddOption,

        (void **)&mCupsFreeDests,

        (void **)&mCupsGetDest,

        (void **)&mCupsGetDests,

        (void **)&mCupsPrintFile,

        (void **)&mCupsTempFd,

    };

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

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

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

#ifdef DEBUG

            nsAutoCString msg(gSymName[i]);

            msg.AppendLiteral(" not found in CUPS library");

            NS_WARNING(msg.get());

#endif

            PR_UnloadLibrary(mCupsLib);

            mCupsLib = nullptr;

            return false;

        }

    }

    return true;

}