From 9af0e5a44801f40a14540554e59fa823e0b2d4af Mon Sep 17 00:00:00 2001
From: Marco Hladik <marco@icculus.org>
Date: Mon, 14 Feb 2022 15:00:48 -0800
Subject: [PATCH] Support for demo prefixes (/pXXX) so we can finally see the
 .dmo recordings some mods ship with, without overriding the builtin ones.

---
 game.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/game.c b/game.c
index 9bec85c..3776344 100755
--- a/game.c
+++ b/game.c
@@ -76,6 +76,7 @@ char qe,cp;
 int32 CommandSoundToggleOff = 0;
 int32 CommandMusicToggleOff = 0;
 
+char demoprefix[128];
 char confilename[128] = {"GAME.CON"},boardfilename[128] = {0};
 char waterpal[768], slimepal[768], titlepal[768], drealms[768], endingpal[768];
 char firstdemofile[80] = { '\0' };
@@ -6721,6 +6722,16 @@ void checkcommandline(int argc,char **argv)
                     case '?':
                         comlinehelp(argv);
                         exit(0);
+					/* demo prefix --eukara */
+                    case 'p':
+                    case 'P':
+                        c++;
+                        if(*c)
+                        {
+                            strcpy(demoprefix,c);
+							printf("Using demo prefix: '%s'\n",demoprefix);
+                        }
+                        break;
                     case 'x':
                     case 'X':
                         c++;
@@ -7794,6 +7805,7 @@ int main(int argc,char **argv)
 char opendemoread(char which_demo) // 0 = mine
 {
     char d[] = "demo_.dmo";
+	char dest[128];
     char *fname = d;
     char ver;
     short i;
@@ -7803,6 +7815,10 @@ char opendemoread(char which_demo) // 0 = mine
     else
         d[4] = '0' + which_demo;
 
+	/* demo prefix support --eukara */
+	strcpy(dest, demoprefix);
+	strcat(dest, d);
+
     ud.reccnt = 0;
 
      if(which_demo == 1 && firstdemofile[0] != 0)
@@ -7811,7 +7827,7 @@ char opendemoread(char which_demo) // 0 = mine
        if ((recfilep = kopen4load(firstdemofile,loadfromgrouponly)) == -1) return(0);
      }
      else
-       if ((recfilep = kopen4load(d,loadfromgrouponly)) == -1) return(0);
+       if ((recfilep = kopen4load(dest,loadfromgrouponly)) == -1) return(0);
 
      kread32(recfilep,&ud.reccnt);
      kread8(recfilep,&ver);