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>>>> man sscanf의 일부분
[ Matches a non-empty sequence of characters from a set
of expected characters (the scanset). The normal skip
over white-space characters is suppressed in this
case. The corresponding argument must be a pointer to
the initial byte of an array of char, signed char, or
unsigned char large enough to accept the sequence and
a terminating null byte, which will be added automati-
cally.

If an l (ell) qualifier is present, the input is a
sequence of characters that begins in the initial
shift state. Each character in the sequence is con-
verted to a wide-character as if by a call to the
mbrtowc() function, with the conversion state
described by an mbstate_t object initialized to zero
before the first character is converted. The
corresponding argument must be a pointer to an array
of wchar_t large enough to accept the sequence and the
terminating null wide-character, which will be added
automatically.

The conversion specification includes all subsequent
characters in the format string up to and including
the matching right square bracket (]). The characters
between the square brackets (the scanlist) comprise
the scanset, unless the character after the left
square bracket is a circumflex (^), in which case the
scanset contains all characters that do not appear in
the scanlist between the circumflex and the right
square bracket. If the conversion specification begins
with [] or [^], the right square bracket is included
in the scanlist and the next right square bracket is
the matching right square bracket that ends the
conversion specification; otherwise the first right
square bracket is the one that ends the conversion
specification. If a - is in the scanlist and is not
the first character, nor the second where the first
character is a ^, nor the last character, it indicates
a range of characters to be matched.