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questions about gen-cipher.h

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Can some explain why the constructs:

#define __xINIT_CIPHER_BLKOPS(name)    INIT_CIPHER_BLKOPS(name)
#define __xINIT_CIPHER_OPS(name)       INIT_CIPHER_OPS(name)

...

#define __STR(x) # x
#define __xSTR(x) __STR(x)

#define __CAT(x,y) x ## y
#define __xCAT(x,y) __CAT(x,y)

Why have __xCAT(x,y) at all? Why not just call __CAT() directly?
Ditto for INIT_CIPHER_BLKOPS().

]       ON HUMILITY: to err is human. To moo, bovine.           |  firewalls  [
]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |net architect[
] mcr@sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device driver[
] panic("Just another NetBSD/notebook using, kernel hacking, security guy");  [


    
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Linux-crypto:  cryptography in and on the Linux system
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