/usr/include/gribex/sfbits.h is in libemos-dev 000382+dfsg-2.
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C STATEMENT FUNCTIONS TO MANIPULATE BITS IN WORDS OF 64 BITS
C
C DATA ONES/7777777777777777B/
C DATA OOOS/0B/
C
C 1. SINGLE BIT MANIPULATIONS
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C 1.1 SET BIT KBIT IN WORD PW
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IBSET(KW,KBIT)=OR(KW,SHIFT(1B,KBIT))
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C 2. WORD MANIPULATIONS, BIT BY BIT
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C 2.1 ARE WORDS PW1 AND PW2 EQUAL?
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C LOGICAL NLEQAL
C NLEQAL(PW1,PW2)=(PW1.XOR.PW2).EQ.0B
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C 2.2 BITWISE AND AND OR
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IAND(K1,K2)=AND(K1,K2)
IOR (K1,K2)= OR(K1,K2)
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C 2.3 BITWISE NEGATION
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NOT(K)=COMPL(K)
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C 2.4 SHIFT (LEFT FOR KSH POSITIVE, RIGHT FOR KSH NEGATIVE)
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ISHFT(K,KSH)=CVMGP(SHIFTL(K,KSH),SHIFTR(K,-KSH),KSH)
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C 3. SPECIAL PURPOSE
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C 3.1 TAKE 4 LAST BITS OF KW, PUT THEM IN PW AT POS K*4-1
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C SETLEV(PW,KW,K)=OR(AND(PW,SHIFT(0B.EQV.17B,K*4-4)),
C +SHIFT(AND(17B,KW),K*4-4))
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C 3.2 EXTRACT FIELD K*4-1:4 FROM PW
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C MGTLEV(PW,K)=AND(17B,SHIFT(PW,68-K*4))
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