Mercurial > gnulib
view doc/posix-functions/swprintf.texi @ 39983:db717b5315cf
docs: mention printf %m considerations
gcc -Wformat does NOT flag printf("%m") on a BSD system, even though
it prints only "m" instead of the desired GNU/Linux behavior of the
current errno value (you have to use -Wpedantic to flag it, but that's
a rather heavy hammer). Still, it's easy enough (even if verbose)
to write out strerror() usage directly, to the point that gnulib will
probably never provide a module to guarantee %m everywhere.
See also https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88270
* doc/glibc-functions/asprintf.texi (asprintf): Document that %m
is not portable, and is easy enough to work around.
* doc/glibc-functions/obstack_printf.texi (obstack_printf): Likewise.
* doc/glibc-functions/obstack_vprintf.texi (obstack_vprintf): Likewise.
* doc/glibc-functions/vasprintf.texi (vasprintf): Likewise.
* doc/posix-functions/dprintf.texi (dprintf): Likewise.
* doc/posix-functions/fprintf.texi (fprintf): Likewise.
* doc/posix-functions/fwprintf.texi (fwprintf): Likewise.
* doc/posix-functions/printf.texi (printf): Likewise.
* doc/posix-functions/snprintf.texi (snprintf): Likewise.
* doc/posix-functions/sprintf.texi (sprintf): Likewise.
* doc/posix-functions/swprintf.texi (swprintf): Likewise.
* doc/posix-functions/vdprintf.texi (vdprintf): Likewise.
* doc/posix-functions/vfprintf.texi (vfprintf): Likewise.
* doc/posix-functions/vfwprintf.texi (vfwprintf): Likewise.
* doc/posix-functions/vprintf.texi (vprintf): Likewise.
* doc/posix-functions/vsnprintf.texi (vsnprintf): Likewise.
* doc/posix-functions/vsprintf.texi (vsprintf): Likewise.
* doc/posix-functions/vswprintf.texi (vswprintf): Likewise.
* doc/posix-functions/vwprintf.texi (vwprintf): Likewise.
* doc/posix-functions/wprintf.texi (wprintf): Likewise.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Thu, 29 Nov 2018 13:33:28 -0600 |
parents | b8576602c861 |
children |
line wrap: on
line source
@node swprintf @section @code{swprintf} @findex swprintf POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/swprintf.html} Gnulib module: --- Portability problems fixed by Gnulib: @itemize @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 This function is missing on some platforms: NetBSD 3.0, OpenBSD 3.8, Minix 3.1.8, HP-UX 11.00, IRIX 6.5, Solaris 2.6, Cygwin 1.5.x, Interix 3.5, BeOS. @item This function has a different signature on some platforms: MSVC 9. @item This function is only defined as a macro on some platforms: MSVC 14. @item This function does not support the @samp{n} directive on some platforms: MSVC 14. @item On AIX and Windows platforms, @code{wchar_t} is a 16-bit type and therefore cannot accommodate all Unicode characters. @item On Windows, this function does not take a buffer size as second argument. @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