@node printf
@section @code{printf}
@findex printf

POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/printf.html}

Gnulib module: printf-posix or stdio, sigpipe

Portability problems fixed by Gnulib module @code{printf-posix}:
@itemize
@item
This function does not support size specifiers as in C99 (@code{hh}, @code{ll},
@code{j}, @code{t}, @code{z}) on some platforms:
AIX 5.1, HP-UX 11.23, IRIX 6.5, OSF/1 5.1, Solaris 9, Cygwin 2006, mingw, BeOS.
@item
printf of @samp{long double} numbers is unsupported on some platforms:
mingw, BeOS.
@item
printf @code{"%f"}, @code{"%e"}, @code{"%g"} of Infinity and NaN yields an
incorrect result on some platforms:
AIX 5.2, OSF/1 5.1, Solaris 10, mingw.
@item
This function does not support the @samp{a} and @samp{A} directives on some
platforms:
glibc-2.3.6, MacOS X 10.3, NetBSD 3.0, OpenBSD 4.0, AIX 5.2, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin, mingw, BeOS.
@item
This function does not support the @samp{F} directive on some platforms:
NetBSD 3.0, AIX 5.1, HP-UX 11.23, IRIX 6.5, OSF/1 5.1, Solaris 9, Cygwin, mingw, BeOS.
@item
This function does not support format directives that access arguments in an
arbitrary order, such as @code{"%2$s"}, on some platforms:
NetBSD 3.0, mingw, BeOS.
@item
This function doesn't support the @code{'} flag on some platforms:
NetBSD 3.0, Cygwin 2006, mingw.
@item
This function behaves incorrectly when a @samp{-} flag and a negative width
are specified together, on some platforms:
HP-UX 10.20.
@item
printf @code{"%010f"} of NaN and Infinity yields an incorrect result (padded
with zeroes) on some platforms:
MacOS X 10.3, FreeBSD 6.0, NetBSD 3.0, AIX 5.2, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 2007, mingw.
@item
This function does not support precisions larger than 512 or 1024 in integer,
floating-point and pointer output on some platforms:
mingw, BeOS.
@item
This function can crash in out-of-memory conditions on some platforms:
MacOS X 10.3, FreeBSD 6.0, NetBSD 3.0.
@end itemize

Portability problems fixed by Gnulib module @code{stdio} or @code{printf-posix}, together with module @code{sigpipe}:
@itemize
@item
When writing to a pipe with no readers, this function fails, instead of
obeying the current @code{SIGPIPE} handler, on some platforms:
mingw.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@end itemize