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Annotation of 42BSD/usr.lib/libF77/bit.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *     "@(#)bit.c      1.1"
        !             3:  *
        !             4:  * bit set, clear, test routines
        !             5:  *
        !             6:  * calling sequences:
        !             7:  *     logical l, bit, state
        !             8:  *     call bis (bitnum, word)
        !             9:  *     call bic (bitnum, word)
        !            10:  *     call setbit (bitnum, word, state)
        !            11:  *     l = bit (bitnum, word)
        !            12:  * where:
        !            13:  *     bis(bic) sets(clears) bitnum in word
        !            14:  *     setbit sets bitnum in word to 1 if state is .true.
        !            15:  *     bit tests bitnum in word and returns a logical (t/f) value
        !            16:  */
        !            17: 
        !            18: long bis_(n, w)
        !            19: long *n, *w;
        !            20: {
        !            21:        if (*n >= 0 && *n <= 31)
        !            22:                *w |= (1L << (*n));
        !            23: }
        !            24: 
        !            25: long bic_(n, w)
        !            26: long *n, *w;
        !            27: {
        !            28:        if (*n >= 0 && *n <= 31)
        !            29:                *w &= ~(1L << (*n));
        !            30: }
        !            31: 
        !            32: long bit_(n, w)
        !            33: long *n, *w;
        !            34: {
        !            35:        if (*n < 0 || *n > 31)
        !            36:                return(0);
        !            37:        return((*w & (1L << (*n))) != 0);
        !            38: }
        !            39: 
        !            40: setbit_(n, w, s)
        !            41: long *n, *w, *s;
        !            42: {
        !            43:        if (*s)
        !            44:                bis_(n, w);
        !            45:        else
        !            46:                bic_(n, w);
        !            47: }

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