From cf219e920bb038c9ac2c879adcfd048dc13bf3bc Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Wed, 24 May 2017 09:06:41 -0400
Subject: [PATCH] Seed command fully implemented but apparently buggy.

Dwarf appearance is not yet reproducible.
---
 actions1.c | 12 ++++++++++--
 main.c     |  5 ++++-
 misc.c     |  9 ++++-----
 misc.h     |  2 +-
 4 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/actions1.c b/actions1.c
index b8fac67..0a1155d 100644
--- a/actions1.c
+++ b/actions1.c
@@ -625,6 +625,14 @@ L8340:	if(!AT(RESER) && LOC != FIXED[RESER]-1) return(2011);
 	RSPEAK(241);
 	 return(2);
 
-L8350:	printf("I see a SEED command. %s\n", raw_input);
-	 return(2);
+/* Seed.  Expected in game logs to replicate the LCG state */
+
+L8350:	{
+	     long sv;
+	     int n;
+	     n = sscanf(raw_input, "seed %ld\n", &sv);
+	     if (n >= 1)
+		 set_seed(sv);
+	     return(2);
+	 }
 }
diff --git a/main.c b/main.c
index d93c967..487eecf 100644
--- a/main.c
+++ b/main.c
@@ -58,6 +58,7 @@ static void do_command(FILE *);
 
 int main(int argc, char *argv[]) {
 	int ch;
+	time_t starttime = time(NULL);
 
 /*  Adventure (rev 2: 20 treasures) */
 
@@ -101,7 +102,7 @@ int main(int argc, char *argv[]) {
 	lcgstate.a = 1093;
 	lcgstate.c = 221587;
 	lcgstate.m = 1048576;
-	set_seed_from_time();
+	set_seed((long)starttime);
 
 /*  Read the database if we have not yet done so */
 
@@ -134,6 +135,8 @@ L1:	SETUP= -1;
 	LIMIT=330;
 	if(NOVICE)LIMIT=1000;
 
+	if (logfp)
+	    fprintf(logfp, "seed %ld\n", starttime);
 	for (;;) {
 	    do_command(stdin);
 	}
diff --git a/misc.c b/misc.c
index 2e68901..f1bd954 100644
--- a/misc.c
+++ b/misc.c
@@ -723,7 +723,7 @@ L2:	ATDWRF=I;
 
 
 
-/*  Utility routines (SETBIT, TSTBIT, set_seed_from_time, get_next_lcg_value, randrange, RNDVOC, BUG) */
+/*  Utility routines (SETBIT, TSTBIT, set_seed, get_next_lcg_value, randrange, RNDVOC, BUG) */
 
 #undef SETBIT
 long fSETBIT(long BIT) {
@@ -758,11 +758,10 @@ long TSTBIT;
 
 #define TSTBIT(MASK,BIT) fTSTBIT(MASK,BIT)
 
-void set_seed_from_time(void)
+void set_seed(long seedval)
 {
-  /* Use the current system time to get seed the ISO rand() function, from which we get a seed for the LCG. */
-  srand(time(NULL));
-  lcgstate.x = (unsigned long) rand() % lcgstate.m;
+	srand(seedval);
+	lcgstate.x = (unsigned long) rand() % lcgstate.m;
 }
 
 unsigned long get_next_lcg_value(void)
diff --git a/misc.h b/misc.h
index 869c672..67f1e9b 100644
--- a/misc.h
+++ b/misc.h
@@ -72,6 +72,6 @@ extern long fIABS(long);
 #define IABS(N) fIABS(N)
 extern long fMOD(long,long);
 #define MOD(N,M) fMOD(N,M)
-extern void set_seed_from_time(void);
+extern void set_seed(long);
 extern unsigned long get_next_lcg_value(void);
 extern long randrange(long);
-- 
2.31.1