kc3-lang/gnulib/doc/posix-functions/vsnprintf.texi

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  Date : 2024-10-27T17:01:29
  

  doc: Add a module index.
  
  * doc/Makefile (undocumented-modules.texi): New rule.
  (%.info, %.html, %.dvi, %.pdf): Depend on undocumented-modules.texi.
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  * doc/*.texi: Add module index entries.
  * doc/*/*.texi: Likewise.
  

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• doc/posix-functions/vsnprintf.texi

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

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