obstack_vprintf
---------------

Documentation:

Variable Arguments Output Functions (libc).

Gnulib module: obstack-printf or obstack-printf-posix

Portability problems fixed by either Gnulib module obstack-printf or obstack-printf-posix:

  * This function is missing on all non-glibc platforms: Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin, mingw, MSVC 14, Android 9.0.

Portability problems fixed by Gnulib module obstack-printf-posix:

  * This function does not support size specifiers as in C99 (hh, ll, j, t, z) on some platforms: AIX 5.1, HP-UX 11.23, IRIX 6.5, Solaris 9, Cygwin 1.5.24, mingw, MSVC 14.

  * printf of long double numbers is unsupported on some platforms: mingw, MSVC 14.

  * printf "%f", "%e", "%g" of Infinity and NaN yields an incorrect result on some platforms: AIX 5.2, Solaris 11.0, mingw, MSVC 14.

  * This function does not support the a and A directives on some platforms: glibc-2.3.6, Mac OS X 10.5, NetBSD 5.0, OpenBSD 4.0, AIX 5.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 1.5.x, mingw, MSVC 14.

  * This function does not support the F directive on some platforms: NetBSD 3.0, AIX 5.1, HP-UX 11.23, IRIX 6.5, Solaris 9, Cygwin 1.5.x, mingw, MSVC 14.

  * This function does not support the n directive on some platforms: MSVC 14.

  * This function does not support the ls directive on some platforms: OpenBSD 4.0, IRIX 6.5, Cygwin 1.5.x, Haiku.

  * This function does not support precisions in the ls directive correctly on some platforms: Solaris 11.4.

  * This function does not support format directives that access arguments in an arbitrary order, such as "%2$s", on some platforms: NetBSD 3.0, mingw, MSVC 14.

  * This function doesn't support the ' flag on some platforms: NetBSD 3.0, Cygwin 1.5.24, mingw, MSVC 14.

  * This function does not round the argument of the a directive correctly on some platforms: Mac OS X 10.12, FreeBSD 6.1.

  * printf "%010f" of NaN and Infinity yields an incorrect result (padded with zeroes) on some platforms: Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, AIX 5.2, IRIX 6.5, Solaris 11.0, Cygwin 1.5.x, mingw, MSVC 14.

  * This function does not support precisions larger than 512 or 1024 in integer, floating-point and pointer output on some platforms: Solaris 10/x86, mingw, MSVC 14.

  * This function can crash in out-of-memory conditions on some platforms: FreeBSD 6.0, NetBSD 5.0.

  * This function does not fully support the n directive on some platforms: HP-UX 11, mingw, MSVC 14.

Portability problems not fixed by Gnulib:

  * The %m directive is not portable, use %s mapped to an argument of strerror(errno) (or a version of strerror_r) instead.