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   printf    ( 3 )

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Стандарты (Conforming to)

fprintf(), printf(), sprintf(), vprintf(), vfprintf(),
       vsprintf(): POSIX.1-2001, POSIX.1-2008, C89, C99.

       snprintf(), vsnprintf(): POSIX.1-2001, POSIX.1-2008, C99.

       The dprintf() and vdprintf() functions were originally GNU
       extensions that were later standardized in POSIX.1-2008.

       Concerning the return value of snprintf(), SUSv2 and C99
       contradict each other: when snprintf() is called with size=0 then
       SUSv2 stipulates an unspecified return value less than 1, while
       C99 allows str to be NULL in this case, and gives the return
       value (as always) as the number of characters that would have
       been written in case the output string has been large enough.
       POSIX.1-2001 and later align their specification of snprintf()
       with C99.

       glibc 2.1 adds length modifiers hh, j, t, and z and conversion
       characters a and A.

       glibc 2.2 adds the conversion character F with C99 semantics, and
       the flag character I.