Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!cornell!uw-beaver!tektronix!percival!littlei!donk!ajw
From: ajw@donk.UUCP (ajw)
Newsgroups: comp.lang.c
Subject: static list initialization
Message-ID: <196@donk.UUCP>
Date: 14 Oct 88 22:07:36 GMT
Distribution: na
Organization: DTO, Intel Corporation; Hillsboro, OR
Lines: 28

Here's a fragment of code I find myself staring at glumly from
time to time.  It sets up the nucleus of a 2-way list, into
which extra malloc'd nodes will be inserted.

    struct whatever {
        struct whatever *next;            /* next node */
        struct whatever *prev;            /* previous node */
        int    eresting_stuff;            /* blah, blah, ... */
    };
    extern struct whatever tail;
    static struct whatever head = { &tail, (struct whatever *)0 };
    static struct whatever tail = { (struct whatever *)0, &head };

Without the 'extern', the compiler can't initialize 'head'.  But
with it, I get a 'non-standard extension' warning, although
everything works just fine.

Question is, is there a way to achieve this initialization within
the letter of the law, leaving 'head' and 'tail' both static?

If you want to e-mail, please use addresses below.  Ta muchly.

-- Alan Waldock                 ...{tektronix|sun}!ogcvax!omepd!ihf1!mdt!ajw
Intel Corp, HF2-37               OR            ...uunet!littlei!ihf1!mdt!ajw
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