Question

I have a problem with the fscanf function

Excuse my bad english.

The program reads the file as follows:

status = fscanf(ifile, "%%!%11s", ifbuf);

if the file starts directly with the desired entry, eg

%! UTF-8
some text

fscanf reads a line in ifbuf.
If in the line starts with whitespaces

    %! UTF-8
some text

fscanf does not read anything.

Making the fscanf function work in both cases can be done by adding a space in the format string:

status = fscanf(ifile, " %%!%11s", ifbuf);

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I wanted to know how correct the behavior of the fscanf function is.

Answer 1

What you describe as the observed behaviour is the correct behaviour. The scanf() functions only skip leading white space on some (most — all but %c and %[, in fact) conversion specifications. For literal components of the format string, it behaves more or less literally, except that a space in the format string matches any number of white space characters in the data.