dprintf-gnu: New module.

* m4/dprintf-posix.m4 (gl_FUNC_DPRINTF_IS_POSIX): New macro,
extracted from gl_FUNC_DPRINTF_POSIX.
(gl_FUNC_DPRINTF_POSIX): Require it. Invoke
gl_PREREQ_VASNPRINTF_WITH_POSIX_EXTRAS.
* m4/dprintf-gnu.m4: New file, based on m4/dprintf-posix.m4.
* modules/dprintf-gnu: New file, based on modules/vasnprintf-gnu.
* doc/posix-functions/dprintf.texi: Mention the new module.

ChangeLog

@@ -1,3 +1,14 @@
+2023-03-24  Bruno Haible  <bruno@clisp.org>
+
+	dprintf-gnu: New module.
+	* m4/dprintf-posix.m4 (gl_FUNC_DPRINTF_IS_POSIX): New macro,
+	extracted from gl_FUNC_DPRINTF_POSIX.
+	(gl_FUNC_DPRINTF_POSIX): Require it. Invoke
+	gl_PREREQ_VASNPRINTF_WITH_POSIX_EXTRAS.
+	* m4/dprintf-gnu.m4: New file, based on m4/dprintf-posix.m4.
+	* modules/dprintf-gnu: New file, based on modules/vasnprintf-gnu.
+	* doc/posix-functions/dprintf.texi: Mention the new module.
+
 2023-03-24  Bruno Haible  <bruno@clisp.org>
 
 	vdprintf-gnu: Add tests.

doc/posix-functions/dprintf.texi

@@ -4,16 +4,16 @@
 
 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/dprintf.html}
 
-Gnulib module: dprintf or dprintf-posix
+Gnulib module: dprintf or dprintf-posix or dprintf-gnu
 
-Portability problems fixed by either Gnulib module @code{dprintf} or @code{dprintf-posix}:
+Portability problems fixed by either Gnulib module @code{dprintf} or @code{dprintf-posix} or @code{dprintf-gnu}:
 @itemize
 @item
 This function is missing on many 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 11.3, Cygwin 1.5.x, mingw, MSVC 14.
 @end itemize
 
-Portability problems fixed by Gnulib module @code{dprintf-posix}:
+Portability problems fixed by either Gnulib module @code{dprintf-posix} or @code{dprintf-gnu}:
 @itemize
 @item
 printf @code{"%f"}, @code{"%e"}, @code{"%g"} of Infinity and NaN yields an
@@ -50,6 +50,13 @@ wide character argument on some platforms:
 glibc 2.35, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2, macOS 12.5, AIX 7.2, Solaris 11.4, and others.
 @end itemize
 
+Portability problems fixed by Gnulib module @code{dprintf-gnu}:
+@itemize
+@item
+This function does not support the @samp{B} directive on some platforms:
+glibc 2.34, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2, macOS 12.5, AIX 7.2, Solaris 11.4, and others.
+@end itemize
+
 Portability problems not fixed by Gnulib:
 @itemize
 @item

m4/dprintf-gnu.m4

@@ -0,0 +1,25 @@
+# dprintf-gnu.m4 serial 1
+dnl Copyright (C) 2023 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_DPRINTF_GNU],
+[
+  AC_REQUIRE([gl_FUNC_DPRINTF_IS_POSIX])
+  AC_REQUIRE([gl_PRINTF_DIRECTIVE_UPPERCASE_B])
+  gl_cv_func_dprintf_gnu=no
+  if test $gl_cv_func_dprintf_posix = yes; then
+    case "$gl_cv_func_printf_directive_uppercase_b" in
+      *yes)
+        # dprintf exists and is already POSIX compliant and GNU compatible.
+        gl_cv_func_dprintf_gnu=yes
+        ;;
+    esac
+  fi
+  if test $gl_cv_func_dprintf_gnu = no; then
+    gl_PREREQ_VASNPRINTF_WITH_GNU_EXTRAS
+    gl_REPLACE_VASNPRINTF
+    gl_REPLACE_DPRINTF
+  fi
+])

m4/dprintf-posix.m4

@@ -1,10 +1,22 @@
-# dprintf-posix.m4 serial 5
+# dprintf-posix.m4 serial 6
 dnl Copyright (C) 2007-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
 AC_DEFUN([gl_FUNC_DPRINTF_POSIX],
+[
+  AC_REQUIRE([gl_FUNC_DPRINTF_IS_POSIX])
+  if test $gl_cv_func_dprintf_posix = no; then
+    gl_PREREQ_VASNPRINTF_WITH_POSIX_EXTRAS
+    gl_REPLACE_VASNPRINTF
+    gl_REPLACE_DPRINTF
+  fi
+])
+
+dnl Test whether dprintf exists and is POSIX compliant.
+dnl Result is gl_cv_func_dprintf_posix.
+AC_DEFUN([gl_FUNC_DPRINTF_IS_POSIX],
 [
   AC_REQUIRE([gl_PRINTF_SIZES_C99])
   AC_REQUIRE([gl_PRINTF_LONG_DOUBLE])
@@ -93,21 +105,4 @@ AC_DEFUN([gl_FUNC_DPRINTF_POSIX],
         ;;
     esac
   fi
-  if test $gl_cv_func_dprintf_posix = no; then
-    gl_PREREQ_VASNPRINTF_LONG_DOUBLE
-    gl_PREREQ_VASNPRINTF_INFINITE_DOUBLE
-    gl_PREREQ_VASNPRINTF_INFINITE_LONG_DOUBLE
-    gl_PREREQ_VASNPRINTF_DIRECTIVE_A
-    gl_PREREQ_VASNPRINTF_DIRECTIVE_B
-    gl_PREREQ_VASNPRINTF_DIRECTIVE_F
-    gl_PREREQ_VASNPRINTF_DIRECTIVE_LS
-    gl_PREREQ_VASNPRINTF_DIRECTIVE_LC
-    gl_PREREQ_VASNPRINTF_FLAG_GROUPING
-    gl_PREREQ_VASNPRINTF_FLAG_LEFTADJUST
-    gl_PREREQ_VASNPRINTF_FLAG_ZERO
-    gl_PREREQ_VASNPRINTF_PRECISION
-    gl_PREREQ_VASNPRINTF_ENOMEM
-    gl_REPLACE_VASNPRINTF
-    gl_REPLACE_DPRINTF
-  fi
 ])

modules/dprintf-gnu

@@ -0,0 +1,29 @@
+Description:
+POSIX and GNU compatible dprintf() function: print formatted output to a file
+descriptor
+
+Comment:
+This module should not be used as a dependency from a test module,
+otherwise when this module occurs as a tests-related module, it will
+have side effects on the compilation of the 'vasnprintf' module, if
+that module occurs among the main modules in lib/.
+
+Files:
+m4/dprintf-gnu.m4
+
+Depends-on:
+dprintf-posix
+
+configure.ac:
+gl_FUNC_DPRINTF_GNU
+
+Makefile.am:
+
+Include:
+<stdio.h>
+
+License:
+LGPL
+
+Maintainer:
+all