*printf-posix: ISO C 23: Add %b directive for binary output of integers.

* lib/printf-parse.c (PRINTF_PARSE): Recognize the 'b' directive.
* lib/printf-parse.h: Update comment.
* lib/wprintf-parse.h: Likewise.
* lib/vasnprintf.c (MAX_ROOM_NEEDED, VASNPRINTF): Add support for the
'b' directive.
* m4/printf.m4 (gl_PRINTF_DIRECTIVE_B): New macro.
* m4/vasnprintf.m4 (gl_PREREQ_VASNPRINTF_DIRECTIVE_B): New macro.
(gl_PREREQ_VASNPRINTF_WITH_EXTRAS): Invoke it.
* m4/vasnwprintf-posix.m4 (gl_FUNC_VASNWPRINTF_POSIX): Invoke
gl_PREREQ_VASNPRINTF_DIRECTIVE_B.
* m4/dprintf-posix.m4 (gl_FUNC_DPRINTF_POSIX): Require
gl_PRINTF_DIRECTIVE_B and test its result. Invoke
gl_PREREQ_VASNPRINTF_DIRECTIVE_B.
* m4/fprintf-posix.m4 (gl_FUNC_FPRINTF_POSIX): Likewise.
* m4/obstack-printf-posix.m4 (gl_FUNC_OBSTACK_PRINTF_POSIX): Likewise.
* m4/snprintf-posix.m4 (gl_FUNC_SNPRINTF_POSIX): Likewise.
* m4/sprintf-posix.m4 (gl_FUNC_SPRINTF_POSIX): Likewise.
* m4/vasnprintf-posix.m4 (gl_FUNC_VASNPRINTF_POSIX): Likewise.
* m4/vasprintf-posix.m4 (gl_FUNC_VASPRINTF_POSIX): Likewise.
* m4/vdprintf-posix.m4 (gl_FUNC_VDPRINTF_POSIX): Likewise.
* m4/vfprintf-posix.m4 (gl_FUNC_VFPRINTF_POSIX): Likewise.
* m4/vsnprintf-posix.m4 (gl_FUNC_VSNPRINTF_POSIX): Likewise.
* m4/vsprintf-posix.m4 (gl_FUNC_VSPRINTF_POSIX): Likewise.
* tests/test-snprintf-posix.h (test_function): Add some tests of the %b
directive.
* tests/test-sprintf-posix.h (test_function): Likewise.
* tests/test-vasnprintf-posix.c (test_function): Likewise.
* tests/test-vasnwprintf-posix.c (test_function): Likewise.
* tests/test-vasprintf-posix.c (test_function): Likewise.
* doc/glibc-functions/asprintf.texi: Mention the 'b' directive.
* doc/glibc-functions/obstack_printf.texi: Likewise.
* doc/glibc-functions/obstack_vprintf.texi: Likewise.
* doc/glibc-functions/vasprintf.texi: Likewise.
* doc/posix-functions/dprintf.texi: Likewise.
* doc/posix-functions/fprintf.texi: Likewise.
* doc/posix-functions/fwprintf.texi: Likewise.
* doc/posix-functions/printf.texi: Likewise.
* doc/posix-functions/snprintf.texi: Likewise.
* doc/posix-functions/sprintf.texi: Likewise.
* doc/posix-functions/swprintf.texi: Likewise.
* doc/posix-functions/vdprintf.texi: Likewise.
* doc/posix-functions/vfprintf.texi: Likewise.
* doc/posix-functions/vfwprintf.texi: Likewise.
* doc/posix-functions/vprintf.texi: Likewise.
* doc/posix-functions/vsnprintf.texi: Likewise.
* doc/posix-functions/vsprintf.texi: Likewise.
* doc/posix-functions/vswprintf.texi: Likewise.
* doc/posix-functions/vwprintf.texi: Likewise.
* doc/posix-functions/wprintf.texi: Likewise.

20 files changed, 124 insertions, 24 deletions

diff --git a/doc/glibc-functions/asprintf.texi b/doc/glibc-functions/asprintf.texi
index 93d092d795..47708c40fb 100644
--- a/doc/glibc-functions/asprintf.texi
+++ b/doc/glibc-functions/asprintf.texi
@@ -41,6 +41,11 @@ This function does not support the @samp{a} and @samp{A} directives on some
 platforms:
 glibc-2.3.6, Mac OS X 10.5, NetBSD 9.0, OpenBSD 4.0, Solaris 11.4, Cygwin 1.5.x.
 @item
+This function does not support the @samp{b} directive, required by ISO C23,
+on some platforms:
+glibc 2.34, musl libc, macOS 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, Solaris 11.4, Cygwin 2.9.0.
+@item
 This function does not support the @samp{F} directive on some platforms:
 NetBSD 3.0, Cygwin 1.5.x.
 @item
diff --git a/doc/glibc-functions/obstack_printf.texi b/doc/glibc-functions/obstack_printf.texi
index b417486e7f..7feae78b36 100644
--- a/doc/glibc-functions/obstack_printf.texi
+++ b/doc/glibc-functions/obstack_printf.texi
@@ -39,6 +39,11 @@ platforms:
 glibc-2.3.6, NetBSD 9.0, OpenBSD 4.0, AIX 5.2, HP-UX 11,
 IRIX 6.5, 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 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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, Solaris 9,
 Cygwin 1.5.x, mingw, MSVC 14.
diff --git a/doc/glibc-functions/obstack_vprintf.texi b/doc/glibc-functions/obstack_vprintf.texi
index a4d6242704..cdded10221 100644
--- a/doc/glibc-functions/obstack_vprintf.texi
+++ b/doc/glibc-functions/obstack_vprintf.texi
@@ -39,6 +39,11 @@ platforms:
 glibc-2.3.6, NetBSD 9.0, OpenBSD 4.0, AIX 5.2, HP-UX 11,
 IRIX 6.5, 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 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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, Solaris 9,
 Cygwin 1.5.x, mingw, MSVC 14.
diff --git a/doc/glibc-functions/vasprintf.texi b/doc/glibc-functions/vasprintf.texi
index 2ba5405558..2f69df8e78 100644
--- a/doc/glibc-functions/vasprintf.texi
+++ b/doc/glibc-functions/vasprintf.texi
@@ -41,6 +41,11 @@ This function does not support the @samp{a} and @samp{A} directives on some
 platforms:
 glibc-2.3.6, Mac OS X 10.5, NetBSD 9.0, OpenBSD 4.0, Solaris 11.4, Cygwin 1.5.x.
 @item
+This function does not support the @samp{b} directive, required by ISO C23,
+on some platforms:
+glibc 2.34, musl libc, macOS 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, Solaris 11.4, Cygwin 2.9.0.
+@item
 This function does not support the @samp{F} directive on some platforms:
 NetBSD 3.0, Cygwin 1.5.x.
 @item
diff --git a/doc/posix-functions/dprintf.texi b/doc/posix-functions/dprintf.texi
index 51428d036f..7d5aeb9051 100644
--- a/doc/posix-functions/dprintf.texi
+++ b/doc/posix-functions/dprintf.texi
@@ -24,6 +24,11 @@ This function does not support the @samp{a} and @samp{A} directives on some
 platforms:
 glibc-2.3.6, Solaris 11.4.
 @item
+This function does not support the @samp{b} directive, required by ISO C23,
+on some platforms:
+glibc 2.34, musl libc, macOS 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, Solaris 11.4, Cygwin 2.9.0.
+@item
 This function does not support the @samp{n} directive on some platforms:
 glibc when used with @code{_FORTIFY_SOURCE >= 2} (set by default on Ubuntu),
 macOS 11.1.
diff --git a/doc/posix-functions/fprintf.texi b/doc/posix-functions/fprintf.texi
index 18c4e0549d..eedd9babbf 100644
--- a/doc/posix-functions/fprintf.texi
+++ b/doc/posix-functions/fprintf.texi
@@ -25,6 +25,11 @@ platforms:
 glibc-2.3.6, Mac OS X 10.5, NetBSD 9.0, OpenBSD 4.0, AIX 5.2, HP-UX 11,
 IRIX 6.5, 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 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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, Solaris 9,
 Cygwin 1.5.x, mingw, MSVC 14.
diff --git a/doc/posix-functions/fwprintf.texi b/doc/posix-functions/fwprintf.texi
index 1bd4f3d4b8..b9ce2eb024 100644
--- a/doc/posix-functions/fwprintf.texi
+++ b/doc/posix-functions/fwprintf.texi
@@ -13,16 +13,21 @@ Portability problems fixed by Gnulib:
 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, Cygwin 1.5.x.
 @item
 On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and therefore cannot
 accommodate all Unicode characters.
 @item
+This function does not support the @samp{b} directive, required by ISO C23,
+on some platforms:
+glibc 2.34, musl libc, macOS 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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
 When formatting an integer with grouping flag, this function inserts thousands
 separators even in the "C" locale on some platforms:
 NetBSD 5.1.
diff --git a/doc/posix-functions/printf.texi b/doc/posix-functions/printf.texi
index 6fab46033e..c32881c2cc 100644
--- a/doc/posix-functions/printf.texi
+++ b/doc/posix-functions/printf.texi
@@ -25,6 +25,11 @@ platforms:
 glibc-2.3.6, Mac OS X 10.5, NetBSD 9.0, OpenBSD 4.0, AIX 5.2, HP-UX 11,
 IRIX 6.5, 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 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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, Solaris 9,
 Cygwin 1.5.x, mingw, MSVC 14.
diff --git a/doc/posix-functions/snprintf.texi b/doc/posix-functions/snprintf.texi
index 13d63acac7..6d8453b9fe 100644
--- a/doc/posix-functions/snprintf.texi
+++ b/doc/posix-functions/snprintf.texi
@@ -40,6 +40,11 @@ platforms:
 glibc-2.3.6, Mac OS X 10.5, NetBSD 9.0, OpenBSD 4.0, AIX 5.2, HP-UX 11,
 IRIX 6.5, 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 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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, Solaris 9,
 Cygwin 1.5.x, mingw, MSVC 14.
diff --git a/doc/posix-functions/sprintf.texi b/doc/posix-functions/sprintf.texi
index 0ced69dc57..8974498ebf 100644
--- a/doc/posix-functions/sprintf.texi
+++ b/doc/posix-functions/sprintf.texi
@@ -25,6 +25,11 @@ platforms:
 glibc-2.3.6, Mac OS X 10.5, NetBSD 9.0, OpenBSD 4.0, AIX 5.2, HP-UX 11,
 IRIX 6.5, 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 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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, Solaris 9,
 Cygwin 1.5.x, mingw, MSVC 14.
diff --git a/doc/posix-functions/swprintf.texi b/doc/posix-functions/swprintf.texi
index a076eb32cf..906ee521aa 100644
--- a/doc/posix-functions/swprintf.texi
+++ b/doc/posix-functions/swprintf.texi
@@ -13,10 +13,6 @@ Portability problems fixed by Gnulib:
 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, Cygwin 1.5.x.
 @item
@@ -35,6 +31,15 @@ accommodate all Unicode characters.
 @item
 On Windows, this function does not take a buffer size as second argument.
 @item
+This function does not support the @samp{b} directive, required by ISO C23,
+on some platforms:
+glibc 2.34, musl libc, macOS 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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
 When formatting an integer with grouping flag, this function inserts thousands
 separators even in the "C" locale on some platforms:
 NetBSD 5.1.
diff --git a/doc/posix-functions/vdprintf.texi b/doc/posix-functions/vdprintf.texi
index ca84b011bb..d4de64ee25 100644
--- a/doc/posix-functions/vdprintf.texi
+++ b/doc/posix-functions/vdprintf.texi
@@ -24,6 +24,11 @@ This function does not support the @samp{a} and @samp{A} directives on some
 platforms:
 glibc-2.3.6, Solaris 11.4.
 @item
+This function does not support the @samp{b} directive, required by ISO C23,
+on some platforms:
+glibc 2.34, musl libc, macOS 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, Solaris 11.4, Cygwin 2.9.0.
+@item
 This function does not support the @samp{n} directive on some platforms:
 glibc when used with @code{_FORTIFY_SOURCE >= 2} (set by default on Ubuntu),
 macOS 11.1.
diff --git a/doc/posix-functions/vfprintf.texi b/doc/posix-functions/vfprintf.texi
index 8441649d03..f3ec56b5a6 100644
--- a/doc/posix-functions/vfprintf.texi
+++ b/doc/posix-functions/vfprintf.texi
@@ -25,6 +25,11 @@ platforms:
 glibc-2.3.6, Mac OS X 10.5, NetBSD 9.0, OpenBSD 4.0, AIX 5.2, HP-UX 11,
 IRIX 6.5, 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 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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, Solaris 9,
 Cygwin 1.5.x, mingw, MSVC 14.
diff --git a/doc/posix-functions/vfwprintf.texi b/doc/posix-functions/vfwprintf.texi
index 56cd3851f8..f6e136b0b1 100644
--- a/doc/posix-functions/vfwprintf.texi
+++ b/doc/posix-functions/vfwprintf.texi
@@ -13,16 +13,21 @@ Portability problems fixed by Gnulib:
 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, Cygwin 1.5.x.
 @item
 On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and therefore cannot
 accommodate all Unicode characters.
 @item
+This function does not support the @samp{b} directive, required by ISO C23,
+on some platforms:
+glibc 2.34, musl libc, macOS 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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
 When formatting an integer with grouping flag, this function inserts thousands
 separators even in the "C" locale on some platforms:
 NetBSD 5.1.
diff --git a/doc/posix-functions/vprintf.texi b/doc/posix-functions/vprintf.texi
index a43942fbd2..6e05d41002 100644
--- a/doc/posix-functions/vprintf.texi
+++ b/doc/posix-functions/vprintf.texi
@@ -25,6 +25,11 @@ platforms:
 glibc-2.3.6, Mac OS X 10.5, NetBSD 9.0, OpenBSD 4.0, AIX 5.2, HP-UX 11,
 IRIX 6.5, 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 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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, Solaris 9,
 Cygwin 1.5.x, mingw, MSVC 14.
diff --git a/doc/posix-functions/vsnprintf.texi b/doc/posix-functions/vsnprintf.texi
index 2f3406ec4c..660ccfb1c3 100644
--- a/doc/posix-functions/vsnprintf.texi
+++ b/doc/posix-functions/vsnprintf.texi
@@ -37,6 +37,11 @@ platforms:
 glibc-2.3.6, Mac OS X 10.5, NetBSD 9.0, OpenBSD 4.0, AIX 5.2, HP-UX 11,
 IRIX 6.5, 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 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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, Solaris 9,
 Cygwin 1.5.x, mingw, MSVC 14.
diff --git a/doc/posix-functions/vsprintf.texi b/doc/posix-functions/vsprintf.texi
index 0ddcdfca12..8af4bdf279 100644
--- a/doc/posix-functions/vsprintf.texi
+++ b/doc/posix-functions/vsprintf.texi
@@ -25,6 +25,11 @@ platforms:
 glibc-2.3.6, Mac OS X 10.5, NetBSD 9.0, OpenBSD 4.0, AIX 5.2, HP-UX 11,
 IRIX 6.5, 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 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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, Solaris 9,
 Cygwin 1.5.x, mingw, MSVC 14.
diff --git a/doc/posix-functions/vswprintf.texi b/doc/posix-functions/vswprintf.texi
index 2f771216ab..62a644fb6d 100644
--- a/doc/posix-functions/vswprintf.texi
+++ b/doc/posix-functions/vswprintf.texi
@@ -13,10 +13,6 @@ Portability problems fixed by Gnulib:
 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, Cygwin 1.5.x.
 @item
@@ -25,6 +21,15 @@ accommodate all Unicode characters.
 @item
 On Windows, this function does not take a buffer size as second argument.
 @item
+This function does not support the @samp{b} directive, required by ISO C23,
+on some platforms:
+glibc 2.34, musl libc, macOS 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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
 When formatting an integer with grouping flag, this function inserts thousands
 separators even in the "C" locale on some platforms:
 NetBSD 5.1.
diff --git a/doc/posix-functions/vwprintf.texi b/doc/posix-functions/vwprintf.texi
index f2d839bdbc..80c8646663 100644
--- a/doc/posix-functions/vwprintf.texi
+++ b/doc/posix-functions/vwprintf.texi
@@ -13,10 +13,6 @@ Portability problems fixed by Gnulib:
 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, Cygwin 1.7.
 @item
@@ -26,6 +22,15 @@ platforms: Cygwin 1.5.x.
 On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and therefore cannot
 accommodate all Unicode characters.
 @item
+This function does not support the @samp{b} directive, required by ISO C23,
+on some platforms:
+glibc 2.34, musl libc, macOS 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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
 When formatting an integer with grouping flag, this function inserts thousands
 separators even in the "C" locale on some platforms:
 NetBSD 5.1.
diff --git a/doc/posix-functions/wprintf.texi b/doc/posix-functions/wprintf.texi
index 48ac729e01..1c3b99b281 100644
--- a/doc/posix-functions/wprintf.texi
+++ b/doc/posix-functions/wprintf.texi
@@ -13,10 +13,6 @@ Portability problems fixed by Gnulib:
 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.
 @item
@@ -26,6 +22,15 @@ platforms: Cygwin 1.5.x.
 On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and therefore cannot
 accommodate all Unicode characters.
 @item
+This function does not support the @samp{b} directive, required by ISO C23,
+on some platforms:
+glibc 2.34, musl libc, macOS 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2,
+AIX 7.2, HP-UX 11, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14.
+@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
 When formatting an integer with grouping flag, this function inserts thousands
 separators even in the "C" locale on some platforms:
 NetBSD 5.1.