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NAME
wnnull -- functions to deal with possibly NULL pointers.
SYNOPSIS
int wn_ptrNULLcmp(&success,p1,p2)
bool success;
ptr p1,p2;
bool wn_ptrNULLeq(&success,p1,p2)
bool success;
ptr p1,p2;
DESCRIPTION
"wn_ptrNULLcmp" sets "success" to TRUE iff "p1" or "p2" is NULL.
If "p1" and "p2" are NULL, it returns 0. If "p1" is NULL but
"p2" is not NULL, it returns a number < 0. If "p1" is not NULL but
"p2" is NULL, it returns a number > 0. If both "p1" and "p2" are not
NULL, it returns 0. This function is useful for
constructing complicated linked structure compares where it is possible
for some pointers to be NULL.
"wn_ptrNULLeq" sets "success" to TRUE iff "p1" or "p2" is NULL.
If "p1" and "p2" are NULL, it returns TRUE. If "p1" is NULL but
"p2" is not NULL, it returns FALSE. If "p1" is not NULL but
"p2" is NULL, it returns FALSE. If both "p1" and "p2" are not
NULL, it returns TRUE. This function is useful for
constructing complicated linked structure equal functions where
it is possible for some pointers to be NULL.
DIAGNOSTICS
BUGS
SEE ALSO
wnsrtl, wnhtbl
AUTHOR
Will Naylor
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