RetroZilla/xpinstall/cleanup/InstallCleanupUnix.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Don Bragg <dbragg@netscape.com>
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#include "InstallCleanup.h"
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>

//----------------------------------------------------------------------------
// Native Unix file deletion function
//----------------------------------------------------------------------------
int NativeDeleteFile(const char* aFileToDelete)
{
    struct stat fileStack;
    if (stat(aFileToDelete, &fileStack) != 0)
    {
      return DONE;// No file to delete, do nothing.
    }
    else 
    {
        if(unlink(aFileToDelete) != 0)
          return TRY_LATER;
    }
    return DONE;
}

//----------------------------------------------------------------------------
// Native Unix file replacement function
//----------------------------------------------------------------------------
int NativeReplaceFile(const char* replacementFile, const char* doomedFile )
{
    struct stat fileStack;

    // replacement file must exist, doomed file doesn't have to
    if (stat(replacementFile, &fileStack) != 0)
        return DONE;

    // don't have to do anything if the files are the same
    if (strcmp(replacementFile, doomedFile) == 0)
        return DONE;

    if (unlink(doomedFile) != 0)
    {
        if (stat(doomedFile, &fileStack) == 0)    
            return TRY_LATER;
    }
    else
    {
      // doomedFile is gone move new file into place
      if (rename(replacementFile, doomedFile) != 0)
          return TRY_LATER; // this shouldn't happen
    }

    return DONE;
}

int main(int argc,char* argv[])
{
    HREG reg;
    int status = DONE;
    struct stat fileStack;

    if ( REGERR_OK == NR_StartupRegistry())
    {
        char regFilePath[256];
        strcpy(regFilePath, argv[0]);
        strcat(regFilePath, ".dat");
        if ( stat(regFilePath, &fileStack) != 0)
            regFilePath[0] =  '\0';
        if ( REGERR_OK == NR_RegOpen(regFilePath, &reg) )
        {
            do {
                status = PerformScheduledTasks(reg);
                if (status != DONE)
                   sleep(1);
            } while (status == TRY_LATER);
            NR_RegClose(&reg);
        }
        NR_ShutdownRegistry();
        unlink(regFilePath);
    }
    return(0);
}