Date: Tue, 30 Jun 2009 16:02:38 -0500 From: "Rick C. Petty" <rick-freebsd2008@kiwi-computer.com> To: Alexander Best <alexbestms@math.uni-muenster.de> Cc: freebsd-hackers@freebsd.org Subject: Re: c question: *printf'ing arrays Message-ID: <20090630210238.GA33849@keira.kiwi-computer.com> In-Reply-To: <permail-20090630182103f7e55a9d0000355c-a_best01@message-id.uni-muenster.de> References: <20090630181121.GA32665@keira.kiwi-computer.com> <permail-20090630182103f7e55a9d0000355c-a_best01@message-id.uni-muenster.de>
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On Tue, Jun 30, 2009 at 08:21:03PM +0200, Alexander Best wrote:
> thanks. now the output gets redirected using >. i'm quite new to programming
> under unix. sorry for the inconvenience.
No problem; we all had to learn sometime. But what I suggested should
work for every platform that adheres to POSIX. If you were using
fprintf/fwrite, then it would work on anything that's standard C. As for
redirection, windows command line allows the same type of redirection.
> so i guess there is no really easy way to output an inhomogeneous struct to
> stdout without using a loop to output each array contained in the struct.
That's not something C would ever provide easily. You may want to use a
different high-level language. However, I often use macros for printing
pieces of structures, for example I used this to print out sizes of kernel
structures:
#define SIZE(astruct, member) \
printf("%d\t\t.%s\n", sizeof(astruct.member), #member)
#include <sys/ktrace.h>
...
struct ktr_header header;
struct ktr_genio genio;
printf("%d\tktr_header:\n", sizeof(header));
SIZE(header, ktr_len);
SIZE(header, ktr_type);
SIZE(header, ktr_pid);
SIZE(header, ktr_comm);
SIZE(header, ktr_time);
SIZE(header, ktr_time.tv_sec);
SIZE(header, ktr_time.tv_sec);
SIZE(header, ktr_tid);
printf("\n%d\tktr_genio:\n", sizeof(genio));
SIZE(genio, ktr_fd);
SIZE(genio, ktr_rw);
In your case, you could make a macro for each type. Without an example of
how you want the output to look, it's hard for us to show you code that
will produce such output.
-- Rick C. Petty
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