122 lines
4.6 KiB
Plaintext
122 lines
4.6 KiB
Plaintext
@node sprintf
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@subsection @code{sprintf}
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@findex sprintf
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/sprintf.html}
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Gnulib module: sprintf-posix or sprintf-gnu
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@mindex sprintf-posix
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@mindex sprintf-gnu
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Portability problems fixed by either Gnulib module @code{sprintf-posix} or @code{sprintf-gnu}:
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@itemize
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@item
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This function does not support size specifiers as in C99 (@code{hh}, @code{ll},
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@code{j}, @code{t}, @code{z}) on some platforms:
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AIX 5.1, HP-UX 11.23, Solaris 9, Cygwin 1.5.24, old mingw, MSVC 9.
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@item
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This function does not support size specifiers as in C23 (@code{w8},
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@code{w16}, @code{w32}, @code{w64}, @code{wf8}, @code{wf16}, @code{wf32},
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@code{wf64}) on some platforms:
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glibc 2.37, musl libc, macOS 14, FreeBSD 13.2, NetBSD 10.0, OpenBSD 7.5, AIX 7.3, Solaris 11.4, Cygwin 3.5.3, mingw, MSVC, Android 9.0.
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@item
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printf of @samp{long double} numbers is unsupported on some platforms:
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mingw, MSVC 14.
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@item
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printf @code{"%f"}, @code{"%e"}, @code{"%g"} of Infinity and NaN yields an
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incorrect result on some platforms:
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AIX 7.3, Solaris 11.4, mingw, MSVC 14.
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@item
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This function does not support the @samp{a} and @samp{A} directives on some
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platforms:
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FreeBSD 5.2.1, OpenBSD 4.0, AIX 5.2, HP-UX 11,
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Solaris 11.4, Cygwin 1.5.x, mingw, MSVC 14.
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@item
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This function does not support the @samp{b} directive, required by ISO C23,
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on some platforms:
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glibc 2.34, musl libc, macOS 14, FreeBSD 13.2, NetBSD 10.0, OpenBSD 7.5,
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AIX 7.3, HP-UX 11, Solaris 11.4, Cygwin 3.5.3, mingw, MSVC 14, Android 9.0.
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@item
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This function does not support the @samp{F} directive on some platforms:
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NetBSD 3.0, AIX 5.1, HP-UX 11.23, Solaris 9,
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Cygwin 1.5.x, mingw, MSVC 14.
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@item
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This function does not support the @samp{ls} directive on some platforms:
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OpenBSD 4.0, Cygwin 1.5.x, Haiku.
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@item
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This function does not support precisions in the @samp{ls} directive correctly
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on some platforms:
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Solaris 11.4.
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@item
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This function does not support format directives that access arguments in an
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arbitrary order, such as @code{"%2$s"}, on some platforms:
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NetBSD 3.0, mingw, MSVC 14.
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@item
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This function doesn't support the @code{'} flag on some platforms:
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NetBSD 3.0, Cygwin 1.5.24, mingw, MSVC 14.
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@item
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This function does not round the argument of the @samp{a} directive correctly
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on some platforms:
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macOS 14, FreeBSD 14.0, NetBSD 10.0, OpenBSD 7.5, AIX 7.3, Solaris 11.4.
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@item
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printf @code{"%010f"} of NaN and Infinity yields an incorrect result (padded
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with zeroes, or wrong capitalization) on some platforms:
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Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, AIX 7.3, Solaris 11.4, Cygwin 1.5.x, mingw, MSVC/clang.
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@item
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printf @code{"%#.0x"} or @code{"%#.0X"} with a zero argument yields an
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incorrect result (non-empty) on some platforms:
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Mac OS X 10.6.
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@item
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This function does not support precisions larger than 512 or 1024 in integer,
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floating-point and pointer output on some platforms:
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AIX 7.1, Solaris 10/x86, mingw, MSVC/clang.
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@item
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This function mishandles large floating point precisions
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(for example, formatting 1.0 with @samp{"%.511f"})
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on some platforms:
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Solaris 10.
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@item
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This function produces wrong output for the @samp{lc} directive with a NUL
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wide character argument on some platforms:
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musl libc 1.2.4.
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@item
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This function can crash in out-of-memory conditions on some platforms:
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FreeBSD 14.0, NetBSD 5.0.
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@item
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The compiler warns that this function is deprecated:
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macOS 14.
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@end itemize
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Portability problems fixed by Gnulib module @code{sprintf-gnu}:
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@itemize
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@item
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This function does not support the @samp{B} directive on some platforms:
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glibc 2.34, musl libc, macOS 14, FreeBSD 13.2, NetBSD 10.0, OpenBSD 7.5, AIX 7.3, Solaris 11.4, Cygwin 3.5.3, mingw, MSVC, Android 9.0.
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@end itemize
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@mindex printf-with-n-directive
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Portability problems fixed by either Gnulib module @code{sprintf-posix} or @code{sprintf-gnu}
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and additionally the Gnulib module @code{printf-with-n-directive}:
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@itemize
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@item
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This function does not support the @samp{n} directive on some platforms:
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glibc when used with @code{_FORTIFY_SOURCE >= 2} (set by default on Ubuntu),
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macOS 14, OpenBSD, MSVC 14, Android.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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The @code{%m} directive is not portable, use @code{%s} mapped to an
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argument of @code{strerror(errno)} (or a version of @code{strerror_r})
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instead.
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@item
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Formatting noncanonical @samp{long double} numbers produces
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nonmeaningful results on some platforms:
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glibc and others, on x86, x86_64, IA-64 CPUs.
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@item
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When formatting an integer with grouping flag, this function inserts thousands
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separators even in the "C" locale on some platforms:
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NetBSD 5.1.
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@end itemize
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