Re: Strangeness when moving data through an array.
Re: Strangeness when moving data through an array.
- Subject: Re: Strangeness when moving data through an array.
- From: Andrew Farmer <email@hidden>
- Date: Tue, 30 Nov 2004 23:36:05 -0800
On 30 Nov 2004, at 23:23, Sherm Pendley wrote:
On Nov 30, 2004, at 11:55 PM, John Draper wrote:
Now, I take the data from "pkt" and I want to later stick it into a
16 bit (u_short), and would expect... short_test=258, but
after I execute this statement...
bcopy((u_short)&pkt[MSEQ], &short_test, 2);
short_test = 160
WHY? What's going on? How can I extract data from an array in any
arbitrary
index into it (even or odd), and still get back that 2 byte int
correctly?
You're typecasting a pointer (&pkt[MSEQ]) to an integer (u_short),
which smells fishy.
I'd say you probably need to cast to a different pointer type:
bcopy((u_short *)&pkt[MSEQ], &short_test, 2);
Or do something rather simpler.
pkt[MSEQ] = short_test;
(or is there a reason you aren't doing it this way?)
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