🚀 go-pugleaf

ccurtis@ee.fit.edu (Christopher W. Curtis) writes:

>Hi.

>I was wondering if this is a Linux thing (kernel 1.2.1) or a
>more general 'problem'.  If you call strncpy as such:
>	strncpy( dest, NULL, x );
>it will seg fault.  Is this common among all platforms, or
>just with Linux?

>The man page says nothing about it, but I would have presumed
>that if str[n]cpy were passed NULL as a source, it would
>merely catenate the destination.  Did I presume wrong?

If the strncpy() manual does not report any special cases, you should
assume that there are none.
For example, free() supports NULL as a special no-op case, but
strncpy() just tries to copy a string from address 0.
As this is generally not correct, Linux will trap accesses to address
0, so you can immediately see your program has an error.

Frank
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Frank A. Vorstenbosch        +31-(70)-355 5241        falstaff@xs4all.nl