From 37c6b72103cc9d7965a669cdca01edae83f765e4 Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Thu, 21 Dec 2006 21:43:47 +0000
Subject: Split off IWAD-related code into separate d_iwad.c. On Windows,
 search the registry to automatically find the locations of installed IWADs.

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 791
---
 src/Makefile.am |   1 +
 src/d_iwad.c    | 622 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/d_iwad.h    |  36 ++++
 src/d_main.c    | 437 ++++-----------------------------------
 src/m_misc.c    |  19 ++
 src/m_misc.h    |   2 +
 6 files changed, 716 insertions(+), 401 deletions(-)
 create mode 100644 src/d_iwad.c
 create mode 100644 src/d_iwad.h

diff --git a/src/Makefile.am b/src/Makefile.am
index 6ffac860..d34a5b17 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -40,6 +40,7 @@ deh_weapon.c                               \
 d_englsh.h                                 \
 d_event.h                                  \
 d_items.c            d_items.h             \
+d_iwad.c             d_iwad.h              \
 d_main.c             d_main.h              \
 d_net.c              d_net.h               \
 doomdata.h                                 \
diff --git a/src/d_iwad.c b/src/d_iwad.c
new file mode 100644
index 00000000..96e0670c
--- /dev/null
+++ b/src/d_iwad.c
@@ -0,0 +1,622 @@
+// Emacs style mode select   -*- C++ -*- 
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 2006 Simon Howard
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+//
+// DESCRIPTION:
+//     Search for and locate an IWAD file, and initialise according
+//     to the IWAD type.
+//
+//-----------------------------------------------------------------------------
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+
+#include "deh_main.h"
+#include "doomdef.h"
+#include "doomstat.h"
+#include "i_system.h"
+#include "m_argv.h"
+#include "m_misc.h"
+#include "w_wad.h"
+#include "z_zone.h"
+
+// Array of locations to search for IWAD files
+
+#define MAX_IWAD_DIRS 32
+static char *iwad_dirs[MAX_IWAD_DIRS];
+static int num_iwad_dirs = 0;
+
+static void AddIWADDir(char *dir)
+{
+    iwad_dirs[num_iwad_dirs] = dir;
+    ++num_iwad_dirs;
+}
+
+// This is Windows-specific code that automatically finds the location
+// of installed IWAD files.  The registry is inspected to find special
+// keys installed by the Windows installers for various CD versions
+// of Doom.  From these keys we can deduce where to find an IWAD.
+
+#ifdef _WIN32
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+typedef struct 
+{
+    HKEY root;
+    char *path;
+    char *value;
+} registry_value_t;
+
+#define UNINSTALLER_STRING "\\uninstl.exe /S "
+
+// Keys installed by the various CD editions.  These are actually the 
+// commands to invoke the uninstaller and look like this:
+//
+// C:\Program Files\Path\uninstl.exe /S C:\Program Files\Path
+//
+// With some munging we can find where Doom was installed.
+
+static registry_value_t uninstall_values[] = 
+{
+    // Ultimate Doom, CD version (Depths of Doom trilogy)
+
+    {
+        HKEY_LOCAL_MACHINE, 
+        "Software\\Microsoft\\Windows\\CurrentVersion\\"
+            "Uninstall\\Ultimate Doom for Windows 95",
+        "UninstallString",
+    },
+
+    // Doom II, CD version (Depths of Doom trilogy)
+
+    {
+        HKEY_LOCAL_MACHINE, 
+        "Software\\Microsoft\\Windows\\CurrentVersion\\"
+            "Uninstall\\Doom II for Windows 95",
+        "UninstallString",
+    },
+
+    // Final Doom
+
+    {
+        HKEY_LOCAL_MACHINE, 
+        "Software\\Microsoft\\Windows\\CurrentVersion\\"
+            "Uninstall\\Final Doom for Windows 95",
+        "UninstallString",
+    },
+};
+
+// Value installed by the Collector's Edition when it is installed
+
+static registry_value_t collectors_edition_value =
+{
+    HKEY_LOCAL_MACHINE,
+    "Software\\Activision\\DOOM Collector's Edition\\v1.0",
+    "INSTALLPATH",
+};
+
+// Subdirectories of the above install path, where IWADs are installed.
+
+static char *collectors_edition_subdirs[] = 
+{
+    "Doom2",
+    "Final Doom",
+    "Ultimate Doom",
+};
+
+static char *GetRegistryString(registry_value_t *reg_val)
+{
+    HKEY key;
+    int len;
+    int valtype;
+    char *result;
+
+    // Open the key (directory where the value is stored)
+
+    if (RegOpenKeyEx(reg_val->root, reg_val->path, 0, KEY_READ, &key) 
+          != ERROR_SUCCESS)
+    {
+        return NULL;
+    }
+
+    // Find the type and length of the string
+
+    if (RegQueryValueEx(key, reg_val->value, NULL, &valtype, NULL, &len) 
+          != ERROR_SUCCESS)
+    {
+        return NULL;
+    }
+
+    // Only accept strings
+
+    if (valtype != REG_SZ)
+    {
+        return NULL;
+    }
+
+    // Allocate a buffer for the value and read the value
+
+    result = Z_Malloc(len, PU_STATIC, 0);
+
+    if (RegQueryValueEx(key, reg_val->value, NULL, &valtype, result, &len) 
+          != ERROR_SUCCESS)
+    {
+        Z_Free(result);
+        return NULL;
+    }
+
+    // Close the key
+        
+    RegCloseKey(key);
+
+    return result;
+}
+
+// Check for the uninstall strings from the CD versions
+
+static void CheckUninstallStrings(void)
+{
+    int i;
+
+    for (i=0; i<sizeof(uninstall_values) / sizeof(*uninstall_values); ++i)
+    {
+        char *val;
+        char *path;
+        char *unstr;
+
+        val = GetRegistryString(&uninstall_values[i]);
+
+        if (val == NULL)
+        {
+            continue;
+        }
+
+        unstr = strstr(val, UNINSTALLER_STRING);
+
+        if (unstr == NULL)
+        {
+            Z_Free(val);
+        }
+        else
+        {
+            path = unstr + strlen(UNINSTALLER_STRING);
+
+            AddIWADDir(path);
+        }
+    }
+}
+
+// Check for Doom: Collector's Edition
+
+static void CheckCollectorsEdition(void)
+{
+    char *install_path;
+    char *subpath;
+    int i;
+
+    install_path = GetRegistryString(&collectors_edition_value);
+
+    if (install_path == NULL)
+    {
+        return;
+    }
+
+    for (i=0; i<sizeof(collectors_edition_subdirs)
+                  / sizeof(*collectors_edition_subdirs); ++i)
+    {
+        subpath = Z_Malloc(strlen(install_path)
+                           + strlen(collectors_edition_subdirs[i])
+                           + 5,
+                           PU_STATIC, 0);
+
+        sprintf(subpath, "%s\\%s", install_path, collectors_edition_subdirs[i]);
+
+        AddIWADDir(subpath);
+    }
+
+    Z_Free(install_path);
+}
+
+#endif
+
+static struct 
+{
+    char *name;
+    GameMission_t mission;
+} iwads[] = {
+    {"doom2.wad",    doom2},
+    {"plutonia.wad", pack_plut},
+    {"tnt.wad",      pack_tnt},
+    {"doom.wad",     doom},
+    {"doom1.wad",    doom},
+};
+
+// Search a directory to try to find an IWAD
+// Returns the location of the IWAD if found, otherwise NULL.
+
+static char *SearchDirectoryForIWAD(char *dir)
+{
+    size_t i;
+
+    for (i=0; i<sizeof(iwads) / sizeof(*iwads); ++i) 
+    {
+        char *filename; 
+        char *iwadname;
+
+        iwadname = DEH_String(iwads[i].name);
+        
+        filename = Z_Malloc(strlen(dir) + strlen(iwadname) + 3, PU_STATIC, 0);
+
+        sprintf(filename, "%s/%s", dir, iwadname);
+
+        if (M_FileExists(filename))
+        {
+            gamemission = iwads[i].mission;
+            return filename;
+        }
+
+        Z_Free(filename);
+    }
+
+    return NULL;
+}
+
+// When given an IWAD with the '-iwad' parameter,
+// attempt to identify it by its name.
+
+static void IdentifyIWADByName(char *name)
+{
+    size_t i;
+
+    gamemission = none;
+    
+    for (i=0; i<sizeof(iwads) / sizeof(*iwads); ++i)
+    {
+        char *iwadname;
+
+        iwadname = DEH_String(iwads[i].name);
+
+        if (strlen(name) < strlen(iwadname))
+            continue;
+
+        // Check if it ends in this IWAD name.
+
+        if (!strcasecmp(name + strlen(name) - strlen(iwadname), 
+                        iwadname))
+        {
+            gamemission = iwads[i].mission;
+            break;
+        }
+    }
+}
+
+//
+// Build a list of IWAD files
+//
+
+static void BuildIWADDirList(void)
+{
+    char *doomwaddir;
+
+    // Check the DOOMWADDIR environment variable.
+
+    doomwaddir = getenv("DOOMWADDIR");
+
+    if (doomwaddir != NULL)
+    {
+        AddIWADDir(doomwaddir);
+    }
+
+    // Look in the current directory.  Doom always does this.
+
+    AddIWADDir(".");
+
+#ifdef _WIN32
+
+    // Search the registry and find where IWADs have been installed.
+
+    CheckUninstallStrings();
+    CheckCollectorsEdition();
+
+#else
+
+    // Standard places where IWAD files are installed under Unix.
+
+    AddIWADDir("/usr/share/games/doom");
+    AddIWADDir("/usr/local/share/games/doom");
+
+#endif
+}
+
+//
+// FindIWAD
+// Checks availability of IWAD files by name,
+// to determine whether registered/commercial features
+// should be executed (notably loading PWADs).
+//
+
+char *D_FindIWAD(void)
+{
+    char *result;
+    int iwadparm;
+    int i;
+
+    iwadparm = M_CheckParm("-iwad");
+
+    if (iwadparm)
+    {
+        result = myargv[iwadparm + 1];
+        IdentifyIWADByName(result);
+    }
+    else
+    {
+        // Build a list of locations to look for an IWAD
+
+        BuildIWADDirList();
+
+        // Search through the list and look for an IWAD
+
+        result = NULL;
+
+        for (i=0; result == NULL && i<num_iwad_dirs; ++i)
+        {
+            result = SearchDirectoryForIWAD(iwad_dirs[i]);
+        }
+    }
+
+    return result;
+}
+
+// 
+// SetSaveGameDir
+//
+// Chooses the directory used to store saved games.
+//
+
+void D_SetSaveGameDir(void)
+{
+    size_t i;
+
+    if (!strcmp(configdir, ""))
+    {
+        // Use the current directory, just like configdir.
+
+        savegamedir = strdup("");
+    }
+    else
+    {
+        // Directory for savegames
+
+        savegamedir = Z_Malloc(strlen(configdir) + 30, PU_STATIC, 0);
+        sprintf(savegamedir, "%ssavegames", configdir);
+
+        M_MakeDirectory(savegamedir);
+
+        // Find what subdirectory to use for savegames
+        //
+        // They should be stored in something like
+        //    ~/.chocolate-doom/savegames/doom.wad/
+        //
+        // The directory depends on the IWAD, so that savegames for
+        // different IWADs are kept separate.
+        //
+        // Note that we match on gamemission rather than on IWAD name.
+        // This ensures that doom1.wad and doom.wad saves are stored
+        // in the same place.
+
+        for (i=0; i<sizeof(iwads) / sizeof(*iwads); ++i)
+        {
+            if (gamemission == iwads[i].mission)
+            {
+                strcat(savegamedir, "/");
+                strcat(savegamedir, iwads[i].name);
+                strcat(savegamedir, "/");
+                M_MakeDirectory(savegamedir);
+                break;
+            }
+        }
+    }
+}
+
+// Strings for dehacked replacements of the startup banner
+//
+// These are from the original source: some of them are perhaps
+// not used in any dehacked patches
+
+static char *banners[] = 
+{
+    // doom1.wad
+    "                            "
+    "DOOM Shareware Startup v%i.%i"
+    "                           ",
+    // doom.wad
+    "                            "
+    "DOOM Registered Startup v%i.%i"
+    "                           ",
+    // Registered DOOM uses this
+    "                          "
+    "DOOM System Startup v%i.%i"
+    "                          ",
+    // doom.wad (Ultimate DOOM)
+    "                         "
+    "The Ultimate DOOM Startup v%i.%i"
+    "                        ",
+    // doom2.wad
+    "                         "
+    "DOOM 2: Hell on Earth v%i.%i"
+    "                           ",
+    // tnt.wad
+    "                     "
+    "DOOM 2: TNT - Evilution v%i.%i"
+    "                           ",
+    // plutonia.wad
+    "                   "
+    "DOOM 2: Plutonia Experiment v%i.%i"
+    "                           ",
+};
+
+//
+// Get game name: if the startup banner has been replaced, use that.
+// Otherwise, use the name given
+// 
+
+static char *GetGameName(char *gamename)
+{
+    size_t i;
+    char *deh_sub;
+    
+    for (i=0; i<sizeof(banners) / sizeof(*banners); ++i)
+    {
+        // Has the banner been replaced?
+
+        deh_sub = DEH_String(banners[i]);
+        
+        if (deh_sub != banners[i])
+        {
+            // Has been replaced
+            // We need to expand via printf to include the Doom version 
+            // number
+            // We also need to cut off spaces to get the basic name
+
+            gamename = Z_Malloc(strlen(deh_sub) + 10, PU_STATIC, 0);
+            sprintf(gamename, deh_sub, DOOM_VERSION / 100, DOOM_VERSION % 100);
+
+            while (gamename[0] != '\0' && isspace(gamename[0]))
+                strcpy(gamename, gamename+1);
+
+            while (gamename[0] != '\0' && isspace(gamename[strlen(gamename)-1]))
+                gamename[strlen(gamename) - 1] = '\0';
+            
+            return gamename;
+        }
+    }
+
+    return gamename;
+}
+
+
+//
+// Find out what version of Doom is playing.
+//
+
+void D_IdentifyVersion(void)
+{
+    // gamemission is set up by the D_FindIWAD function.  But if 
+    // we specify '-iwad', we have to identify using 
+    // IdentifyIWADByName.  However, if the iwad does not match
+    // any known IWAD name, we may have a dilemma.  Try to 
+    // identify by its contents.
+
+    if (gamemission == none)
+    {
+        unsigned int i;
+
+        for (i=0; i<numlumps; ++i)
+        {
+            if (!strncasecmp(lumpinfo[i].name, "MAP01", 8))
+            {
+                gamemission = doom2;
+                break;
+            } 
+            else if (!strncasecmp(lumpinfo[i].name, "E1M1", 8))
+            {
+                gamemission = doom;
+                break;
+            }
+        }
+
+        if (gamemission == none)
+        {
+            // Still no idea.  I don't think this is going to work.
+
+            I_Error("Unknown or invalid IWAD file.");
+        }
+    }
+
+    // Make sure gamemode is set up correctly
+
+    if (gamemission == doom)
+    {
+        // Doom 1.  But which version?
+
+        if (W_CheckNumForName("E4M1") > 0)
+        {
+            // Ultimate Doom
+
+            gamemode = retail;
+        } 
+        else if (W_CheckNumForName("E3M1") > 0)
+        {
+            gamemode = registered;
+        }
+        else
+        {
+            gamemode = shareware;
+        }
+    }
+    else
+    {
+        // Doom 2 of some kind.
+
+        gamemode = commercial;
+    }
+}
+
+// Set the gamedescription string
+
+void D_SetGameDescription(void)
+{
+    gamedescription = "Unknown";
+
+    if (gamemission == doom)
+    {
+        // Doom 1.  But which version?
+
+        if (gamemode == retail)
+        {
+            // Ultimate Doom
+
+            gamedescription = GetGameName("The Ultimate DOOM");
+        } 
+        else if (gamemode == registered)
+        {
+            gamedescription = GetGameName("DOOM Registered");
+        }
+        else if (gamemode == shareware)
+        {
+            gamedescription = GetGameName("DOOM Shareware");
+        }
+    }
+    else
+    {
+        // Doom 2 of some kind.  But which mission?
+
+        if (gamemission == doom2)
+            gamedescription = GetGameName("DOOM 2: Hell on Earth");
+        else if (gamemission == pack_plut)
+            gamedescription = GetGameName("DOOM 2: Plutonia Experiment"); 
+        else if (gamemission == pack_tnt)
+            gamedescription = GetGameName("DOOM 2: TNT - Evilution");
+    }
+}
+
diff --git a/src/d_iwad.h b/src/d_iwad.h
new file mode 100644
index 00000000..404d7efb
--- /dev/null
+++ b/src/d_iwad.h
@@ -0,0 +1,36 @@
+// Emacs style mode select   -*- C++ -*- 
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 2006 Simon Howard
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+//
+// DESCRIPTION:
+//     Find IWAD and initialise according to IWAD type.
+//
+//-----------------------------------------------------------------------------
+
+
+#ifndef __D_IWAD__
+#define __D_IWAD__
+
+char *D_FindIWAD(void);
+void D_SetSaveGameDir(void);
+void D_IdentifyVersion(void);
+void D_SetGameDescription(void);
+
+#endif
+
diff --git a/src/d_main.c b/src/d_main.c
index f77c55cf..a8c46a95 100644
--- a/src/d_main.c
+++ b/src/d_main.c
@@ -28,11 +28,6 @@
 //-----------------------------------------------------------------------------
 
 
-
-#define	BGCOLOR		7
-#define	FGCOLOR		8
-
-
 #include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -47,6 +42,7 @@
 #include "doomfeatures.h"
 #include "sounds.h"
 
+#include "d_iwad.h"
 
 #include "z_zone.h"
 #include "w_wad.h"
@@ -595,345 +591,6 @@ static boolean D_AddFile(char *filename)
     return handle != NULL;
 }
 
-
-// Check if a file exists
-
-static int FileExists(char *filename)
-{
-    FILE *fstream;
-
-    fstream = fopen(filename, "r");
-
-    if (fstream != NULL)
-    {
-        fclose(fstream);
-        return 1;
-    }
-    else
-    {
-        return 0;
-    }
-}
-
-struct 
-{
-    char *name;
-    GameMission_t mission;
-} iwads[] = {
-    {"doom2.wad",    doom2},
-    {"plutonia.wad", pack_plut},
-    {"tnt.wad",      pack_tnt},
-    {"doom.wad",     doom},
-    {"doom1.wad",    doom},
-};
-
-// Search a directory to try to find an IWAD
-// Returns the location of the IWAD if found, otherwise NULL.
-
-static char *SearchDirectoryForIWAD(char *dir)
-{
-    size_t i;
-
-    for (i=0; i<sizeof(iwads) / sizeof(*iwads); ++i) 
-    {
-        char *filename; 
-	char *iwadname;
-
-	iwadname = DEH_String(iwads[i].name);
-	
-	filename = malloc(strlen(dir) + strlen(iwadname) + 3);
-
-        sprintf(filename, "%s/%s", dir, iwadname);
-
-        if (FileExists(filename))
-        {
-            iwadfile = filename;
-            gamemission = iwads[i].mission;
-            return filename;
-        }
-
-        free(filename);
-    }
-
-    return NULL;
-}
-
-// When given an IWAD with the '-iwad' parameter,
-// attempt to identify it by its name.
-
-static void IdentifyIWADByName(char *name)
-{
-    size_t i;
-
-    gamemission = none;
-    
-    for (i=0; i<sizeof(iwads) / sizeof(*iwads); ++i)
-    {
-	char *iwadname;
-
-	iwadname = DEH_String(iwads[i].name);
-
-        if (strlen(name) < strlen(iwadname))
-            continue;
-
-        // Check if it ends in this IWAD name.
-
-        if (!strcasecmp(name + strlen(name) - strlen(iwadname), 
-                        iwadname))
-        {
-            gamemission = iwads[i].mission;
-            break;
-        }
-    }
-}
-
-//
-// FindIWAD
-// Checks availability of IWAD files by name,
-// to determine whether registered/commercial features
-// should be executed (notably loading PWADs).
-//
-
-static void FindIWAD (void)
-{
-    char *doomwaddir;
-    char *result;
-    int iwadparm;
-
-    result = 0;
-    doomwaddir = getenv("DOOMWADDIR");
-    iwadparm = M_CheckParm("-iwad");
-
-    if (iwadparm)
-    {
-        iwadfile = myargv[iwadparm + 1];
-        result = iwadfile;
-        IdentifyIWADByName(iwadfile);
-    }
-    else if (doomwaddir != NULL)
-    {
-        result = SearchDirectoryForIWAD(doomwaddir);
-    }
-
-    if (result == NULL)
-        result = SearchDirectoryForIWAD(".");
-    if (result == NULL)
-        result = SearchDirectoryForIWAD("/usr/share/games/doom");
-    if (result == NULL)
-        result = SearchDirectoryForIWAD("/usr/local/share/games/doom");
-
-    if (result == NULL)
-    {
-        I_Error("Game mode indeterminate.  No IWAD file was found.  Try\n"
-                "specifying one with the '-iwad' command line parameter.\n");
-    }
-}
-
-// Strings for dehacked replacements of the startup banner
-//
-// These are from the original source: some of them are perhaps
-// not used in any dehacked patches
-
-static char *banners[] = 
-{
-    // doom1.wad
-    "                            "
-    "DOOM Shareware Startup v%i.%i"
-    "                           ",
-    // doom.wad
-    "                            "
-    "DOOM Registered Startup v%i.%i"
-    "                           ",
-    // Registered DOOM uses this
-    "                          "
-    "DOOM System Startup v%i.%i"
-    "                          ",
-    // doom.wad (Ultimate DOOM)
-    "                         "
-    "The Ultimate DOOM Startup v%i.%i"
-    "                        ",
-    // doom2.wad
-    "                         "
-    "DOOM 2: Hell on Earth v%i.%i"
-    "                           ",
-    // tnt.wad
-    "                     "
-    "DOOM 2: TNT - Evilution v%i.%i"
-    "                           ",
-    // plutonia.wad
-    "                   "
-    "DOOM 2: Plutonia Experiment v%i.%i"
-    "                           ",
-};
-
-// Copyright message banners
-// Some dehacked mods replace these.  These are only displayed if they are 
-// replaced by dehacked.
-
-static char *copyright_banners[] =
-{
-    "===========================================================================\n"
-    "ATTENTION:  This version of DOOM has been modified.  If you would like to\n"
-    "get a copy of the original game, call 1-800-IDGAMES or see the readme file.\n"
-    "        You will not receive technical support for modified games.\n"
-    "                      press enter to continue\n"
-    "===========================================================================\n",
-
-    "===========================================================================\n"
-    "                 Commercial product - do not distribute!\n"
-    "         Please report software piracy to the SPA: 1-800-388-PIR8\n"
-    "===========================================================================\n",
-
-    "===========================================================================\n"
-    "                                Shareware!\n"
-    "===========================================================================\n"
-};
-
-//
-// Get game name: if the startup banner has been replaced, use that.
-// Otherwise, use the name given
-// 
-
-static char *GetGameName(char *gamename)
-{
-    size_t i;
-    char *deh_sub;
-    
-    for (i=0; i<sizeof(banners) / sizeof(*banners); ++i)
-    {
-        // Has the banner been replaced?
-
-        deh_sub = DEH_String(banners[i]);
-        
-        if (deh_sub != banners[i])
-        {
-            // Has been replaced
-            // We need to expand via printf to include the Doom version 
-            // number
-            // We also need to cut off spaces to get the basic name
-
-            gamename = Z_Malloc(strlen(deh_sub) + 10, PU_STATIC, 0);
-            sprintf(gamename, deh_sub, DOOM_VERSION / 100, DOOM_VERSION % 100);
-
-            while (gamename[0] != '\0' && isspace(gamename[0]))
-                strcpy(gamename, gamename+1);
-
-            while (gamename[0] != '\0' && isspace(gamename[strlen(gamename)-1]))
-                gamename[strlen(gamename) - 1] = '\0';
-            
-            return gamename;
-        }
-    }
-
-    return gamename;
-}
-
-
-//
-// Find out what version of Doom is playing.
-//
-
-static void IdentifyVersion(void)
-{
-    // gamemission is set up by the FindIWAD function.  But if 
-    // we specify '-iwad', we have to identify using 
-    // IdentifyIWADByName.  However, if the iwad does not match
-    // any known IWAD name, we may have a dilemma.  Try to 
-    // identify by its contents.
-
-    if (gamemission == none)
-    {
-        unsigned int i;
-
-        for (i=0; i<numlumps; ++i)
-        {
-            if (!strncasecmp(lumpinfo[i].name, "MAP01", 8))
-            {
-                gamemission = doom2;
-                break;
-            } 
-            else if (!strncasecmp(lumpinfo[i].name, "E1M1", 8))
-            {
-                gamemission = doom;
-                break;
-            }
-        }
-
-        if (gamemission == none)
-        {
-            // Still no idea.  I don't think this is going to work.
-
-            I_Error("Unknown or invalid IWAD file.");
-        }
-    }
-
-    // Make sure gamemode is set up correctly
-
-    if (gamemission == doom)
-    {
-        // Doom 1.  But which version?
-
-        if (W_CheckNumForName("E4M1") > 0)
-        {
-            // Ultimate Doom
-
-            gamemode = retail;
-        } 
-        else if (W_CheckNumForName("E3M1") > 0)
-        {
-            gamemode = registered;
-        }
-        else
-        {
-            gamemode = shareware;
-        }
-    }
-    else
-    {
-        // Doom 2 of some kind.
-
-        gamemode = commercial;
-    }
-}
-
-// Set the gamedescription string
-
-static void SetGameDescription(void)
-{
-    gamedescription = "Unknown";
-
-    if (gamemission == doom)
-    {
-        // Doom 1.  But which version?
-
-        if (gamemode == retail)
-        {
-            // Ultimate Doom
-
-            gamedescription = GetGameName("The Ultimate DOOM");
-        } 
-        else if (gamemode == registered)
-        {
-            gamedescription = GetGameName("DOOM Registered");
-        }
-        else if (gamemode == shareware)
-        {
-            gamedescription = GetGameName("DOOM Shareware");
-        }
-    }
-    else
-    {
-        // Doom 2 of some kind.  But which mission?
-
-        if (gamemission == doom2)
-            gamedescription = GetGameName("DOOM 2: Hell on Earth");
-        else if (gamemission == pack_plut)
-            gamedescription = GetGameName("DOOM 2: Plutonia Experiment"); 
-        else if (gamemission == pack_tnt)
-            gamedescription = GetGameName("DOOM 2: TNT - Evilution");
-    }
-}
-
 #define MAXARGVS        100
 	
 static void LoadResponseFile(int argv_index)
@@ -1107,6 +764,29 @@ void PrintBanner(char *msg)
     puts(msg);
 }
 
+// Copyright message banners
+// Some dehacked mods replace these.  These are only displayed if they are 
+// replaced by dehacked.
+
+static char *copyright_banners[] =
+{
+    "===========================================================================\n"
+    "ATTENTION:  This version of DOOM has been modified.  If you would like to\n"
+    "get a copy of the original game, call 1-800-IDGAMES or see the readme file.\n"
+    "        You will not receive technical support for modified games.\n"
+    "                      press enter to continue\n"
+    "===========================================================================\n",
+
+    "===========================================================================\n"
+    "                 Commercial product - do not distribute!\n"
+    "         Please report software piracy to the SPA: 1-800-388-PIR8\n"
+    "===========================================================================\n",
+
+    "===========================================================================\n"
+    "                                Shareware!\n"
+    "===========================================================================\n"
+};
+
 // Prints a message only if it has been modified by dehacked.
 
 void PrintDehackedBanners(void)
@@ -1134,57 +814,6 @@ void PrintDehackedBanners(void)
     }
 }
 
-// 
-// SetSaveGameDir
-//
-// Chooses the directory used to store saved games.
-//
-
-static void SetSaveGameDir(void)
-{
-    size_t i;
-
-    if (!strcmp(configdir, ""))
-    {
-        // Use the current directory, just like configdir.
-
-        savegamedir = strdup("");
-    }
-    else
-    {
-        // Directory for savegames
-
-        savegamedir = malloc(strlen(configdir) + 30);
-        sprintf(savegamedir, "%ssavegames", configdir);
-
-        M_MakeDirectory(savegamedir);
-
-        // Find what subdirectory to use for savegames
-        //
-        // They should be stored in something like
-        //    ~/.chocolate-doom/savegames/doom.wad/
-        //
-        // The directory depends on the IWAD, so that savegames for
-        // different IWADs are kept separate.
-        //
-        // Note that we match on gamemission rather than on IWAD name.
-        // This ensures that doom1.wad and doom.wad saves are stored
-        // in the same place.
-
-        for (i=0; i<sizeof(iwads) / sizeof(*iwads); ++i)
-        {
-            if (gamemission == iwads[i].mission)
-            {
-                strcat(savegamedir, "/");
-                strcat(savegamedir, iwads[i].name);
-                strcat(savegamedir, "/");
-                M_MakeDirectory(savegamedir);
-                break;
-            }
-        }
-    }
-}
-
 static struct 
 {
     char *description;
@@ -1327,14 +956,20 @@ void D_DoomMain (void)
     if (M_CheckParm("-search"))
         NET_LANQuery();
             
-
-
 #ifdef FEATURE_DEHACKED
     printf("DEH_Init: Init Dehacked support.\n");
     DEH_Init();
 #endif
 
-    FindIWAD ();
+    iwadfile = D_FindIWAD();
+
+    // None found?
+
+    if (iwadfile == NULL)
+    {
+        I_Error("Game mode indeterminate.  No IWAD file was found.  Try\n"
+                "specifying one with the '-iwad' command line parameter.\n");
+    }
 	
     setbuf (stdout, NULL);
     modifiedgame = false;
@@ -1545,10 +1180,10 @@ void D_DoomMain (void)
 
     W_GenerateHashTable();
     
-    IdentifyVersion();
+    D_IdentifyVersion();
     InitGameVersion();
-    SetGameDescription();
-    SetSaveGameDir();
+    D_SetGameDescription();
+    D_SetSaveGameDir();
 
     // Check for -file in shareware
     if (modifiedgame)
diff --git a/src/m_misc.c b/src/m_misc.c
index 5930140c..42736371 100644
--- a/src/m_misc.c
+++ b/src/m_misc.c
@@ -122,6 +122,25 @@ void M_MakeDirectory(char *path)
 #endif
 }
 
+// Check if a file exists
+
+boolean M_FileExists(char *filename)
+{
+    FILE *fstream;
+
+    fstream = fopen(filename, "r");
+
+    if (fstream != NULL)
+    {
+        fclose(fstream);
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
 
 
 
diff --git a/src/m_misc.h b/src/m_misc.h
index 2258ec78..41ba96ae 100644
--- a/src/m_misc.h
+++ b/src/m_misc.h
@@ -57,6 +57,8 @@ void M_SetConfigDir(void);
 
 void M_MakeDirectory(char *dir);
 
+boolean M_FileExists(char *file);
+
 
 int
 M_DrawText
-- 
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