I am using fprintf to append a string to a document, here is the line I have a question about:
fprintf(win, bff[i - 2] != '\n' && bff[i - 2] != '\r' ? "\nmultiscreen=1" : "multiscreen=1");
The code works, it appends multiscreen=1
to the next available line in the file.
But if I understand correctly wouldn't it NOT be adding a NULL
character to the end of multiscreen=1
? Does this even matter since I'm writing it to a file and the trailing NULL
in a string is a C thing?
Or would it be more correct to use fputs
instead of fprintf
?
String literals automatically have a 0
as the last character in them. So you don't need to add one yourself.
The NUL
terminator is only for fprintf
(or whatever string function you are using) to know when to stop writing characters from the pointer; no NUL
is actually ever written to the file.
And yes, I would recommend using fputs
instead of fprintf
since you're not using any of the formatting facilities of fprintf
, unless you use pmg's suggestion in the comments to your question which does use formatting sequences.
You don't need the NULL
in the file. It's a C convention and has nothing to do with files. You're good.
You don't need the trailing \\0
if you write to a file. It is just the way C uses to delimit the string because otherwise there is no way of knowing where the string ends
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