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sprintf format error

 
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SeeCwriter



Joined: 18 Nov 2013
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sprintf format error
PostPosted: Mon Jun 01, 2015 9:32 am     Reply with quote

When a variable is declared as an int, the following sprint() statement fails to compile with a format error:
Code:

int myvar = 3;
sprint( ptr, "%d", myvar );


If I change the format to %c, it compiles. Or if I change the variable declaration to byte, which is int8_t, it compiles.

Does this make sense?

v5.046 PCWHD, 18F87J60.
SeeCwriter



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PostPosted: Mon Jun 01, 2015 9:35 am     Reply with quote

"sprint" is a typo, it should be sprintf.
Ttelmah



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PostPosted: Mon Jun 01, 2015 10:21 am     Reply with quote

Do you possibly have a #type declaration in your code?.

Remember a default 'int' is unsigned, while %d prints a signed variable. Normally though I'd not expect that to complain, but if int had been re-declared, so it was an int16 (for example), then the printf would complain.

Just tried it, and if I have:

#type int=16

then it complains exactly as you describe.

You then have to use %ld


Last edited by Ttelmah on Mon Jun 01, 2015 10:37 am; edited 1 time in total
SeeCwriter



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PostPosted: Mon Jun 01, 2015 10:32 am     Reply with quote

I have a number of typedef's, but I did not redefine 'int'.

I even tried format %u, and it still failed. It doesn't make sense.
Ttelmah



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PostPosted: Mon Jun 01, 2015 10:39 am     Reply with quote

Not typedef's #type.

This changes the default size of a variable.

With int re-declared as an int16, then the %ld format has to be used.

Do a search in your code for #type. There will be one in the chip include file, so look carefully at what they all say.
SeeCwriter



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PostPosted: Mon Jun 01, 2015 11:37 am     Reply with quote

I've searched all the files in PICC\Devices and in PICC\Drivers and I could find no #type statements. I also searched all my project files, and no #type.

But I'm beginning to think there is something else going on. The compiler is acting differently. It no longer generates a list of compiler errors, it just lists one error at a time. Fix that error and recompile, and it lists one error...etc. And the errors I'm getting now don't make sense, such as the sprintf() format error. I tried %u, %d, %ld, %lu, and they all generate a format error if the variable is declared as 'int'.

So I change the variable to 'byte', and that error goes away, but the next one is "Function used but not defined." But it is defined. I have a whole file that is nothing but function prototypes that is included right after the chip header file. Nevertheless, I move the prototype into the same file as the call. Still get the error. Move the prototype to just before the call, still get the error. I finally rewrite the function into a #define statement. Now the error is gone, but a new one shows up, and it's the next line of code: Function used but not defined. Comment out that call, and the next line is flagged as an undefined error. This is all bogus. I think the project is corrupt or there is a problem with the new compiler version, v5.046.
PCM programmer



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PostPosted: Mon Jun 01, 2015 11:56 am     Reply with quote

In your previous thread, I point out that the CCS modified stack does
have #type statements in it, and 'int' is redefined as 16 bits:
http://www.ccsinfo.com/forum/viewtopic.php?t=53963&start=2&highlight=type
SeeCwriter



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PostPosted: Mon Jun 01, 2015 12:12 pm     Reply with quote

I did not remember that. However, I have wrapped all TCP/IP stack statements in #ifdef's and have removed TCP/IP from the project. I also renamed the tcpip directory created under my project directory just to make sure no stack files were being accessed.

That will present a problem in the future when I try to enable Ethernet capability and have to go through the program re-declaring many variables.
Ttelmah



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PostPosted: Mon Jun 01, 2015 1:02 pm     Reply with quote

First, start with a much smaller (literally ten line) program, and verify that things work correctly.

Then look at #device=ANSI. This makes the default integer size int16, so %d will print an int16. Makes the variable sizes match what the ethernet stack will expect.

Then consider if you might have something really simple, like a #define that is affecting your int definition.

On your 'error' behaviour, there is a tick box in the project options 'show all errors'. If this is unticked, only the first error will be shown. From the command line, this is the -E option. It does suggest that some project options have been changed. Look at everything here carefully. Perhaps a global define?.
SeeCwriter



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PostPosted: Wed Jun 03, 2015 4:57 pm     Reply with quote

Even wrapping all the Ethernet includes and configurations in #ifdef's to remove them from the program did not solve the problem. My last resort was to start over.

I created a new project with no Ethernet capability, and copied over all my non-Ethernet related code to the new project. And now all the weirdness is gone, I can build an executable, and it's running on my hardware.
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