How to compare null and space using single if condition Post: 302195465

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compare null with non-null

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Hi, We receive flat files with fixed width data Now our goal is append from right null or space to each record if the lenght of the record is less than for example 10. for example 123 45 6 0 123 45 123 45 6 123 and output should be 123 45 6 0 123 45**** 123 45 6**...

LEARN ABOUT NETBSD

ucas

UCAS(9) 						   BSD Kernel Developer's Manual						   UCAS(9)

NAME

     ucas -- atomic memory operations on user-space address

SYNOPSIS

     #include <sys/systm.h>

     int
     ucas_ptr(volatile void *uptr, void *old, void *new, void *retp);

     int
     ucas_int(volatile int *uptr, int old, int new, int *retp);

DESCRIPTION

     These functions provide compare-and-swap (CAS) functionality on user-space address.

     Except that they can be safely used for the kernel to access user-space address, they are semantically equivalents of atomic_cas(3).

     uptr  The pointer to the variable.  This should be a user-space pointer.

     old   The value to compare with the variable.

     new   The value to store to the variable.

     retp  The pointer to the memory to store the old value of the variable.

RETURN VALUES

     On success, these functions return 0.  In that case, the caller can consult the value returned via retp to check the result of the CAS opera-
     tion.  Otherwise, these functions return an appropriate errno(9) error code, typically EFAULT.

SEE ALSO

     atomic_cas(3), intro(9)

BUGS

     Conceptually, the retp argument of ucas_ptr() would be of void **.  The current prototype is a compromise for usability.

BSD
								 October 24, 2011							       BSD

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

compare null with non-null

Discussion started by: nitin

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How can find Null value in If condition

Discussion started by: koti_rama

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Cannot replace null with space

Discussion started by: rikxik

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How to Compare Null values??

Discussion started by: Yagami