*printf-posix: Work around bug with %lc of 0 on many platforms.

* lib/vasnprintf.c (local_wctomb): Define also for
NEED_PRINTF_DIRECTIVE_LC.
(VASNPRINTF): Implement %lc handling ourselves if
NEED_PRINTF_DIRECTIVE_LC.
* m4/printf.m4 (gl_PRINTF_DIRECTIVE_LC): New macro.
* m4/vasnprintf.m4 (gl_PREREQ_VASNPRINTF_DIRECTIVE_LC): New macro.
(gl_PREREQ_VASNPRINTF_WITH_EXTRAS): Invoke it.
* m4/dprintf-posix.m4 (gl_FUNC_DPRINTF_POSIX): Require
gl_PRINTF_DIRECTIVE_LC and test its result. Invoke
gl_PREREQ_VASNPRINTF_DIRECTIVE_LC.
* 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 more tests for the
%c and %lc directives.
* tests/test-sprintf-posix.h (test_function): Likewise.
* tests/test-vasnprintf-posix.c (test_function): Likewise.
* tests/test-vasprintf-posix.c (test_function): Likewise.
* doc/glibc-functions/asprintf.texi: Mention the %lc 0 bug.
* 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/printf.texi: Likewise.
* doc/posix-functions/snprintf.texi: Likewise.
* doc/posix-functions/sprintf.texi: Likewise.
* doc/posix-functions/vdprintf.texi: Likewise.
* doc/posix-functions/vfprintf.texi: Likewise.
* doc/posix-functions/vprintf.texi: Likewise.
* doc/posix-functions/vsnprintf.texi: Likewise.
* doc/posix-functions/vsprintf.texi: Likewise.

1 files changed, 16 insertions, 10 deletions

diff --git a/m4/obstack-printf-posix.m4 b/m4/obstack-printf-posix.m4
index 633b017442..8092119906 100644
--- a/m4/obstack-printf-posix.m4
+++ b/m4/obstack-printf-posix.m4
@@ -1,4 +1,4 @@
-# obstack-printf-posix.m4 serial 5
+# obstack-printf-posix.m4 serial 6
 dnl Copyright (C) 2008-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -18,6 +18,7 @@ AC_DEFUN([gl_FUNC_OBSTACK_PRINTF_POSIX],
   AC_REQUIRE([gl_PRINTF_DIRECTIVE_F])
   AC_REQUIRE([gl_PRINTF_DIRECTIVE_N])
   AC_REQUIRE([gl_PRINTF_DIRECTIVE_LS])
+  AC_REQUIRE([gl_PRINTF_DIRECTIVE_LC])
   AC_REQUIRE([gl_PRINTF_POSITIONS])
   AC_REQUIRE([gl_PRINTF_FLAG_GROUPING])
   AC_REQUIRE([gl_PRINTF_FLAG_LEFTADJUST])
@@ -45,21 +46,25 @@ AC_DEFUN([gl_FUNC_OBSTACK_PRINTF_POSIX],
                                   *yes)
                                     case "$gl_cv_func_printf_directive_ls" in
                                       *yes)
-                                        case "$gl_cv_func_printf_positions" in
+                                        case "$gl_cv_func_printf_directive_lc" in
                                           *yes)
-                                            case "$gl_cv_func_printf_flag_grouping" in
+                                            case "$gl_cv_func_printf_positions" in
                                               *yes)
-                                                case "$gl_cv_func_printf_flag_leftadjust" in
+                                                case "$gl_cv_func_printf_flag_grouping" in
                                                   *yes)
-                                                    case "$gl_cv_func_printf_flag_zero" in
+                                                    case "$gl_cv_func_printf_flag_leftadjust" in
                                                       *yes)
-                                                        case "$gl_cv_func_printf_precision" in
+                                                        case "$gl_cv_func_printf_flag_zero" in
                                                           *yes)
-                                                            case "$gl_cv_func_printf_enomem" in
+                                                            case "$gl_cv_func_printf_precision" in
                                                               *yes)
-                                                                # obstack_printf exists and is
-                                                                # already POSIX compliant.
-                                                                gl_cv_func_obstack_printf_posix=yes
+                                                                case "$gl_cv_func_printf_enomem" in
+                                                                  *yes)
+                                                                    # obstack_printf exists and is
+                                                                    # already POSIX compliant.
+                                                                    gl_cv_func_obstack_printf_posix=yes
+                                                                    ;;
+                                                                esac
                                                                 ;;
                                                             esac
                                                             ;;
@@ -99,6 +104,7 @@ AC_DEFUN([gl_FUNC_OBSTACK_PRINTF_POSIX],
     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