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SUBROUTINE phrtsd(phrase,phrasel,seed1,seed2)
C**********************************************************************
C
C SUBROUTINE PHRTSD( PHRASE, SEED1, SEED2 )
C PHRase To SeeDs
C
C
C Function
C
C
C Uses a phrase (character string) to generate two seeds for the RGN
C random number generator.
C
C
C Arguments
C
C
C PHRASE --> Phrase to be used for random number generation
C CHARACTER*(*) PHRASE
C
C SEED1 <-- First seed for RGN generator
C INTEGER SEED1
C
C SEED2 <-- Second seed for RGN generator
C INTEGER SEED2
C
C
C Note
C
C
C Trailing blanks are eliminated before the seeds are generated.
C
C Generated seed values will fall in the range 1..2^30
C (1..1,073,741,824)
C
C**********************************************************************
C .. Parameters ..
CHARACTER*(*) table
PARAMETER (table='abcdefghijklmnopqrstuvwxyz'//
+ 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'//'0123456789'//
+ '!@#$%^&*()_+[];:''"<>?,./')
INTEGER twop30
PARAMETER (twop30=1073741824)
C ..
C .. Scalar Arguments ..
INTEGER seed1,seed2
CHARACTER phrase* (*)
INTEGER phrasel
C ..
C .. Local Scalars ..
INTEGER i,ichr,j,lphr
C ..
C .. Local Arrays ..
INTEGER shift(0:4),values(5)
C ..
C .. External Functions ..
INTEGER lennob
EXTERNAL lennob
C ..
C .. Intrinsic Functions ..
INTRINSIC index,mod
C ..
C JJV added Save statement for variable in Data statement
C .. Save statements ..
SAVE shift
C JJV end addition
C ..
C .. Data statements ..
DATA shift/1,64,4096,262144,16777216/
C ..
C .. Executable Statements ..
seed1 = 1234567890
seed2 = 123456789
C lphr = lennob(phrase)
lphr = phrasel
IF (lphr.LT.1) RETURN
DO 30,i = 1,lphr
ichr = mod(index(table,phrase(i:i)),64)
IF (ichr.EQ.0) ichr = 63
DO 10,j = 1,5
values(j) = ichr - j
IF (values(j).LT.1) values(j) = values(j) + 63
10 CONTINUE
DO 20,j = 1,5
seed1 = mod(seed1+shift(j-1)*values(j),twop30)
seed2 = mod(seed2+shift(j-1)*values(6-j),twop30)
20 CONTINUE
30 CONTINUE
RETURN
END
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