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heretic: allow for arbitrarily long demo file names (#1328)

--- a/src/heretic/g_game.c

+++ b/src/heretic/g_game.c

@@ -109,7 +109,7 @@

 int mouseSensitivity;

-char demoname[32];

+char *demoname;

 boolean demorecording;

 boolean longtics;               // specify high resolution turning in demos

 boolean lowres_turn;

@@ -1858,6 +1858,7 @@

 void G_RecordDemo(skill_t skill, int numplayers, int episode, int map,

                   const char *name)

 {

+    size_t demoname_size;

     int i;

     int maxsize;

@@ -1884,8 +1885,9 @@

     G_InitNew(skill, episode, map);

     usergame = false;

-    M_StringCopy(demoname, name, sizeof(demoname));

-    M_StringConcat(demoname, ".lmp", sizeof(demoname));

+    demoname_size = strlen(name) + 5;

+    demoname = Z_Malloc(demoname_size, PU_STATIC, NULL);

+    M_snprintf(demoname, demoname_size, "%s.lmp", name);

     maxsize = 0x20000;

     //!