Date: Wed, 01 Jul 2009 02:01:54 +0200 (CEST) From: Alexander Best <alexbestms@math.uni-muenster.de> To: Alfred Perlstein <alfred@freebsd.org> Cc: rick-freebsd2008@kiwi-computer.com, freebsd-hackers@freebsd.org Subject: Re: c question: *printf'ing arrays Message-ID: <permail-20090701000154f7e55a9d00000ac4-a_best01@message-id.uni-muenster.de> In-Reply-To: <20090630225457.GR84786@elvis.mu.org>
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wow. thanks. that's looking really nice. i'll change my sources tomorrow after
a good dose of sleep. ;)
alex
Alfred Perlstein schrieb am 2009-07-01:
> Hey Alex,
> People frown on macros, but this could be a good one:
> #define SPRINT(f, fmt) \
> do {\
> for (_i = 0; _i < sizeof(f)/sizeof(f[0]); i++) \
> printf(fmt, f[i]); \
> }while(0)
> :D
> This should allow you to point to any _array_ and print each
> element of it using format "fmt".
> Example:
> SPRINT(Header->game_title, "%c");
> -Alfred
> * Alexander Best <alexbestms@math.uni-muenster.de> [090630 15:06]
> wrote:
> > thanks for all the help. i decided to take the pill and coded all
> > the fprintfs
> > by hand. here's the result. usually i'd stick to a higher level
> > languag, but i
> > need C's inline assembly support:
> > struct Header
> > {
> > u_int8_t rom_entry[4];
> > u_int8_t nintendo_logo[156];
> > u_char game_title[12];
> > u_char game_code[4];
> > u_char maker_code[2];
> > u_int8_t fixed_val;
> > u_int8_t unit_code;
> > u_int8_t device_type;
> > u_int8_t reserved_area1[7];
> > u_int8_t software_version;
> > u_int8_t complement_check;
> > u_int8_t reserved_area2;
> > u_int8_t ram_entry[4];
> > u_int8_t boot_mode;
> > u_int8_t slave_id;
> > u_int8_t unused_area[26];
> > u_int8_t joybus_entry[4];
> > };
> > struct Header * hdr = rom;
> > int i;
> > fprintf(stderr, "ROM Entry: 0x");
> > for (i=0; i < 4; i++) fprintf(stderr, "%x", hdr->rom_entry[i]);
> > fprintf(stderr, "\nNintendo Logo: 0x");
> > for (i=0; i < sizeof(hdr->nintendo_logo); i++) fprintf(stderr,
> > "%x",
> > hdr->nintendo_logo[i]);
> > fprintf(stderr, "\nGame Title: %s", hdr->game_title);
> > fprintf(stderr, "\nGame Code: %s", hdr->game_code);
> > fprintf(stderr, "\nMaker Code: %s", hdr->maker_code);
> > fprintf(stderr, "\nFixed Value: 0x");
> > fprintf(stderr, "%x", hdr->fixed_val);
> > fprintf(stderr, "\nUnit Code: 0x");
> > fprintf(stderr, "%x", hdr->unit_code);
> > fprintf(stderr, "\nDevice Type: 0x");
> > fprintf(stderr, "%x", hdr->device_type);
> > fprintf(stderr, "\nReserved Area: 0x");
> > for (i=0; i < sizeof(hdr->reserved_area1); i++) fprintf(stderr,
> > "%x",
> > hdr->reserved_area1[i]);
> > fprintf(stderr, "\nSoftware Version: 0x");
> > fprintf(stderr, "%x", hdr->software_version);
> > fprintf(stderr, "\nComplement Check: 0x");
> > fprintf(stderr, "%x", hdr->complement_check);
> > fprintf(stderr, "\nReserved Area: 0x");
> > fprintf(stderr, "%x", hdr->reserved_area2);
> > fprintf(stderr, "\nRAM Entry Point: 0x");
> > for (i=0; i < sizeof(hdr->ram_entry); i++) fprintf(stderr,
> > "%x",
> > hdr->ram_entry[i]);
> > fprintf(stderr, "\nBoot Mode: 0x");
> > fprintf(stderr, "%x", hdr->boot_mode);
> > fprintf(stderr, "\nSlave ID: 0x");
> > fprintf(stderr, "%x", hdr->slave_id);
> > fprintf(stderr, "\nUnused Area: 0x");
> > for (i=0; i < sizeof(hdr->unused_area); i++) fprintf(stderr,
> > "%x",
> > hdr->unused_area[i]);
> > fprintf(stderr, "\nJoybus Entry Point: 0x");
> > for (i=0; i < sizeof(hdr->joybus_entry); i++) fprintf(stderr,
> > "%x",
> > hdr->joybus_entry[i]);
> > cheers.
> > Rick C. Petty schrieb am 2009-06-30:
> > > 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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