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Merge pull request #1019 from turol/const

Fix some const correctness issues in doom-specific code

--- a/src/doom/d_main.c

+++ b/src/doom/d_main.c

@@ -331,7 +331,7 @@

 static void EnableLoadingDisk(void)

 {

-    char *disk_lump_name;

+    const char *disk_lump_name;

     if (show_diskicon)

     {

@@ -483,7 +483,7 @@

 //

 int             demosequence;

 int             pagetic;

-char                    *pagename;

+const char                    *pagename;

 //

@@ -669,7 +669,7 @@

 static char *GetGameName(char *gamename)

 {

     size_t i;

-    char *deh_sub;

+    const char *deh_sub;

     for (i=0; i<arrlen(banners); ++i)

     {

@@ -927,7 +927,7 @@

     for (i=0; i<arrlen(copyright_banners); ++i)

     {

-        char *deh_s;

+        const char *deh_s;

         deh_s = DEH_String(copyright_banners[i]);

--- a/src/doom/d_player.h

+++ b/src/doom/d_player.h

@@ -132,7 +132,7 @@

     int			secretcount;

     // Hint messages.

-    char*		message;	

+    const char		*message;

     // For screen flashing (red or bright).

     int			damagecount;

--- a/src/doom/g_game.c

+++ b/src/doom/g_game.c

@@ -2113,9 +2113,9 @@

 // G_PlayDemo 

 //

-char*	defdemoname; 

+static const char *defdemoname;

-void G_DeferedPlayDemo (char* name) 

+void G_DeferedPlayDemo(const char *name)

 { 

     defdemoname = name; 

     gameaction = ga_playdemo; 

--- a/src/doom/g_game.h

+++ b/src/doom/g_game.h

@@ -37,7 +37,7 @@

 // but a warp test can start elsewhere

 void G_DeferedInitNew (skill_t skill, int episode, int map);

-void G_DeferedPlayDemo (char* demo);

+void G_DeferedPlayDemo (const char* demo);

 // Can be called by the startup code or M_Responder,

 // calls P_SetupLevel or W_EnterWorld.

--- a/src/doom/p_saveg.c

+++ b/src/doom/p_saveg.c

@@ -184,7 +184,7 @@

     return (void *) (intptr_t) saveg_read32();

 }

-static void saveg_writep(void *p)

+static void saveg_writep(const void *p)

 {

     saveg_write32((intptr_t) p);

 }