Add seedable PRNG using an adaptation the original LCG algorithm.

[open-adventure.git] / main.c

diff --git a/main.c b/main.c
index 71d61c9f08d72e088f270c0c7124250e2e57e94d..4854b695f187bb55545f8b5adc0c40f49a5ba56e 100644 (file)
--- a/main.c
+++ b/main.c
@@ -42,6 +42,7 @@ long ABBNUM, ACTSPK[36], AMBER, ATTACK, AXE, BACK, BATTER, BEAR, BIRD, BLOOD, BO
                WZDARK = false, ZZWORD;
 FILE  *logfp;
 bool oldstyle = false;
+lcg_state lcgstate;
 
 extern void initialise();
 extern void score(long);
@@ -93,6 +94,13 @@ int main(int argc, char *argv[]) {
 
 #include "funcs.h"
 
+/* Initialize our LCG PRNG with parameters tested against Knuth vol. 2. by the original authors */
+
+       lcgstate.a = 1093;
+       lcgstate.c = 221587;
+       lcgstate.m = 1048576;
+       set_seed_from_time();
+
 /*  Read the database if we have not yet done so */
 
        LINES = (long *)calloc(LINSIZ+1,sizeof(long));
@@ -116,7 +124,7 @@ int main(int argc, char *argv[]) {
 /*  Start-up, dwarf stuff */
 
 L1:    SETUP= -1;
-       I=RAN(-1);
+       I=0;
        ZZWORD=RNDVOC(3,0)+MESH*2;
        NOVICE=YES(stdin, 65,1,0);
        NEWLOC=1;
@@ -175,7 +183,7 @@ L6000:      if(DFLAG != 1) goto L6010;
        if(!INDEEP(LOC) || (PCT(95) && (!CNDBIT(LOC,4) || PCT(85)))) goto L2000;
        DFLAG=2;
        for (I=1; I<=2; I++) {
-       J=1+RAN(5);
+       J=1+randrange(5);
        if(PCT(50))DLOC[J]=0;
        } /* end loop */
        for (I=1; I<=5; I++) {
@@ -213,7 +221,7 @@ L6014:      KK=KK+1;
        {long x = KK-1; if(TRAVEL[x] >= 0) goto L6012;}
 L6016: TK[J]=ODLOC[I];
        if(J >= 2)J=J-1;
-       J=1+RAN(J);
+       J=1+randrange(J);
        ODLOC[I]=DLOC[I];
        DLOC[I]=TK[J];
        DSEEN[I]=(DSEEN[I] && INDEEP(LOC)) || (DLOC[I] == LOC || ODLOC[I] == LOC);
@@ -266,7 +274,7 @@ L6027:      DTOTAL=DTOTAL+1;
        if(ODLOC[I] != DLOC[I]) goto L6030;
        ATTACK=ATTACK+1;
        if(KNFLOC >= 0)KNFLOC=LOC;
-       if(RAN(1000) < 95*(DFLAG-2))STICK=STICK+1;
+       if(randrange(1000) < 95*(DFLAG-2))STICK=STICK+1;
 L6030: /*etc*/ ;
        } /* end loop */
 
@@ -380,7 +388,7 @@ L2603:      if(!CLOSED) goto L2605;
        } /* end loop */
 L2605: WZDARK=DARK(0);
        if(KNFLOC > 0 && KNFLOC != LOC)KNFLOC=0;
-       I=RAN(1);
+       I=0;
        GETIN(cmdin, WD1,WD1X,WD2,WD2X);
 
 /*  Every input, check "FOOBAR" flag.  If zero, nothing's going on.  If pos,