fputs

[lzdanny]

I am trying to write to a file using fputs() but when the disk is full, EOF is not returned. Despite this, errno is set to ENOSPC (28) as expected. Has anyone encountered this problem before, as I need to know there is an error when writing to the file before I can handle what type of error it is?

Thanks, lzdanny.

 

[Salem]

Does ferror() also fail to indicate a failure when the disk is full?

--

 

[lzdanny]

ferror does report the error, providing you don't use clearerr before you call it!

i can change the code but i would just like to know why fputs isn't returning EOF...

cheers, dan.

 

[ArkM]

It's not a full explanation, supposition only...
Let's see RTL fputs() epilogue sources (VS 6.0 EE):

  ndone = _fwrite_lk(string,1,length,stream);
  _ftbuf(buffing, stream);
  _unlock_str(stream);

  return(ndone == length ? 0 : EOF);

Probably _ftbuf() can flush buffer but fgets returns its value on the previous returned ndone base only.
2nd scenario: fputs() puts data in buffer successfully, after that implicit flush (for example, on close()) failed with ENOSPC...

In 1st case that behaviour is probably wrong, but in the 2nd case - alas - fgets() can't recognaze future troubles...

Well, in any case you may debug full code with disk overflowed (F11 to enter into RTL stuff)...