C is a standardized language. IBM's main target market is programs ported from other platforms. I have no idea what the standard is, but IBM *may* simply be following it. fopen(NULL, ...) is pretty useless any way you slice it.
I have no idea what (void I)"" would mean and I don't *think* it is valid C. A quick test of auto foo = (void I)""; gives me a bunch of errors. NULL is nothing special in C: it is just an alias for 0 (zero). That lead to a somewhat astonishing behavior in a particular situation involving overloaded functions, and the new (C++ only? Perhaps C also) language standards include nullptr, which is specifically an *address* of zero, and is a better usage than NULL if the meaning is "the address of nothing." That is, "you are expecting me to pass you an address and I am telling you that I have no address to give you." Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Paul Gilmartin Sent: Tuesday, March 1, 2022 8:30 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: ZAD and C/C++ (was:: 2.5 Heads Up) On Tue, 1 Mar 2022 13:28:01 +0000, wrote: ><snip> >ZAD is not supported on z/OS under z/VM. " :-( >Is there any SOD or RFE or the like for this? ></snip> > Many releases ago, I saw a report the C RTL treatment of following a NULL pointer was changing. I tested open( NULL, ... ) with releases before and after the change. The earlier reported Invalid Pointer; the later Invalid Filename. I considered the earlier more precise and correct. I conjecture that IBM had fecklessly accommodated programmers accustomed to misusing NULL instead of e.g. (void I)"". There are probably still programs that follow null pointers. What will become of them? I favor strict error reporting. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
