A cast pointer is NOT an lvalue!? (ANSI C)

[david wald]

In article <10034 at socslgw.csl.sony.JUNET> diamond at csl.sony.JUNET (Norman Diamond) writes:
>In article <479 at midgard.mn.org>, dal at midgard.mn.org (Dale Schumacher) writes:
>> I used a pointer cast construct like this:
>>
>>    value = *((long *) argp)++;
>
>If you wanted to increment argp by the length of a (long *), then you
>have to do:
>
>     value = *(long *) argp;
>     argp += (sizeof (long *)) / (sizeof argp);
>
>which cannot give a correct result if sizeof (long *) is not a
>multiple of sizeof (int *).

How about:

    value = *(long *)argp;
    argp = (argtype *)((char *)argp + sizeof(long *));

where argtype is the type of *argp?


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David Wald                                              wald-david at yale.UUCP
						       waldave at yalevm.bitnet
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