strange for me ?

[darkshadow]

while im just take alook at stdlib (I start refreash my knowlege in c latly) , I found this

cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX

while
-(LONG_MIN + LONG_MAX) +LONG_MAX = -LONG_MIN
why it is not like this

cutoff = neg ? (unsigned long)-LONG_MIN

is there any meaning to this operation
the version in this link seem correct
http://www.koders.com/c/fid0A9B008CA98BE77AEC5E59AFC19BECAE325AC60F.aspx
but src code in my machine for freebsd is look like the first code

 

[expl]

None of the code you pasted is valid. You are missing else operator.

Did you mean:

cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;

Meaning if "neg" flag is not zero set cutoff to -LONG_MIN if it is zero set it to LONG_MAX.
Both definitions are found in limits.h.

 

[darkshadow]

thanks

thanks for replay im just wondering
while this

cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;

equal to

cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX : LONG_MAX;

why the second used in stdlib implementation in freebsd?
is

-(LONG_MIN + LONG_MAX) + LONG_MAX

is signature or something or it related to c ? or just to make diffrent from gnu implementation any help ?