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Add seedable PRNG using an adaptation the original LCG algorithm.

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Jason S. Ninneman 2017-05-23 23:37:56 -07:00 • committed by Eric S. Raymond
parent 97b00dfb14
commit 5598b7a178
7 changed files with 48 additions and 34 deletions
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18
main.c
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@ -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,