Re: [Plplot-general] [english 100%] Re: [english 100%] Re: [english 100%] Re: cmap0file format

[Arjen M. <arj...@de...>]

Hi Thorsten,

On 2011-05-30 13:53, Thorsten Behrens wrote:
> Hi Arjen!
> 
>>> BTW: You can also define a constant for the string length instead of  
>>> using  integer literals in the code.
>> Good thinking! Actually, as I look at the code, I see that it presumes
>> that lines are never longer than 30 characters.
> 
> If I understand http://en.wikipedia.org/wiki/Fgets corrytly, then the code  
> assumes lines to be no longer than 29 characters because fgets always  
> appends a NUL-byte to the string read (or do I misunderstand something  
> here?). This is why I also thought that you could omit changing the  
> lineending to a NUL-byte. Howevere, just changing all /r, /n to NUL is the  
> safest way, I guess.

Yes, that is true.

> 
>> If they are, the reading process will fail in an uneasy way. I will try
>> and take care of that too.
> 
> Why does it fail in an uneasy way? Will strlen not terminate, because  
> there is no NUL-byte in the string returned by fgets then?
> 

Because the file pointer will not be moved to the end of the line. The
next read would pick up where it left off, so it would read the rest
of the same line, not the next line. That results in errors that are
probably difficult to detect.

I have written a small test program that reads 30 characters and then
skips the rest of the line. Not entirely trivial but it works, so I
will apply that.

Regards,

Arjen
 

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