qbitbits.c File Reference

#include "f2c.h"

Include dependency graph for qbitbits.c:

Go to the source code of this file.

Defines
#define	LONGBITS   32
#define	LONG8BITS   (2*LONGBITS)
Functions
longint	qbit_bits (longint a, integer b, integer len)
longint	qbit_cshift (longint a, integer b, integer len)

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Define Documentation

#define LONG8BITS   (2*LONGBITS)

Definition at line 11 of file qbitbits.c.

Referenced by qbit_cshift().

#define LONGBITS   32

Definition at line 7 of file qbitbits.c.

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Function Documentation

longint qbit_bits	(	longint	a,
		integer	b,
		integer	len
	)

Definition at line 18 of file qbitbits.c.

References L, longint, ulongint, x, and y.

{
        /* Assume 2's complement arithmetic */

        ulongint x, y;

        x = (ulongint) a;
        y = (ulongint)-1L;
        x >>= b;
        y <<= len;
        return (longint)(x & ~y);
        }

longint qbit_cshift	(	longint	a,
		integer	b,
		integer	len
	)

Definition at line 36 of file qbitbits.c.

References long, LONG8BITS, longint, ulongint, x, y, and z.

{
        ulongint x, y, z;

        x = (ulongint)a;
        if (len <= 0) {
                if (len == 0)
                        return 0;
                goto full_len;
                }
        if (len >= LONG8BITS) {
 full_len:
                if (b >= 0) {
                        b %= LONG8BITS;
                        return (longint)(x << b | x >> LONG8BITS - b );
                        }
                b = -b;
                b %= LONG8BITS;
                return (longint)(x << LONG8BITS - b | x >> b);
                }
        y = z = (unsigned long)-1;
        y <<= len;
        z &= ~y;
        y &= x;
        x &= z;
        if (b >= 0) {
                b %= len;
                return (longint)(y | z & (x << b | x >> len - b));
                }
        b = -b;
        b %= len;
        return (longint)(y | z & (x >> b | x << len - b));
        }

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