ldbl-128ibm-compat: Add syslog functions

Similarly to __vfprintf_internal and __vfscanf_internal, the internal
implementation of syslog functions (__vsyslog_internal) takes a
'mode_flags' parameter used to select the format of long double
parameters.  This patch adds variants of the syslog functions that set
'mode_flags' to PRINTF_LDBL_USES_FLOAT128, thus enabling the correct
printing of long double values on powerpc64le, when long double has IEEE
binary128 format (-mabi=ieeelongdouble).

Tested for powerpc64le.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
Reviewed-by: Joseph Myers <joseph@codesourcery.com>
Reviewed-by: Paul E. Murphy <murphyp@linux.ibm.com>

sysdeps/ieee754/ldbl-128ibm-compat/Makefile

@@ -187,7 +187,8 @@ endif
 
 ifeq ($(subdir),misc)
 ldbl-extra-routines += err \
-		       error
+		       error \
+		       syslog
 
 tests-internal += tst-ibm128-warn tst-ieee128-warn
 tests-internal += tst-ibm128-error tst-ieee128-error
@@ -203,6 +204,14 @@ CFLAGS-tst-ibm128-error.c += -mabi=ibmlongdouble -Wno-psabi
 
 CFLAGS-tst-ieee128-warn.c += -mfloat128 -mabi=ieeelongdouble -Wno-psabi
 CFLAGS-tst-ieee128-error.c += -mfloat128 -mabi=ieeelongdouble -Wno-psabi
+
+tests-container += test-syslog-ieee128 test-syslog-ibm128
+CFLAGS-test-syslog-ieee128.c += -mfloat128 -mabi=ieeelongdouble -Wno-psabi
+CFLAGS-test-syslog-ibm128.c += -mabi=ibmlongdouble -Wno-psabi
+
+tests-container += test-syslog-chk-ieee128 test-syslog-chk-ibm128
+CFLAGS-test-syslog-chk-ieee128.c += -mfloat128 -mabi=ieeelongdouble -Wno-psabi
+CFLAGS-test-syslog-chk-ibm128.c += -mabi=ibmlongdouble -Wno-psabi
 endif
 
 # Add IEEE binary128 files as make targets.

sysdeps/ieee754/ldbl-128ibm-compat/Versions

@@ -170,6 +170,11 @@ libc {
     __obstack_printf_chkieee128;
     __obstack_vprintf_chkieee128;
 
+    __syslogieee128;
+    __vsyslogieee128;
+    __syslog_chkieee128;
+    __vsyslog_chkieee128;
+
     __fscanfieee128;
     __scanfieee128;
     __sscanfieee128;

sysdeps/ieee754/ldbl-128ibm-compat/ieee128-syslog.c

@@ -0,0 +1,65 @@
+/* Wrapper for syslog.  IEEE128 version.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdarg.h>
+#include <libioP.h>
+#include <syslog.h>
+
+void
+___ieee128_syslog (int pri, const char *fmt, ...)
+{
+  va_list ap;
+
+  va_start (ap, fmt);
+  __vsyslog_internal (pri, fmt, ap, PRINTF_LDBL_USES_FLOAT128);
+  va_end (ap);
+}
+strong_alias (___ieee128_syslog, __syslogieee128)
+
+void
+___ieee128_vsyslog (int pri, const char *fmt, va_list ap)
+{
+  __vsyslog_internal (pri, fmt, ap, PRINTF_LDBL_USES_FLOAT128);
+}
+strong_alias (___ieee128_vsyslog, __vsyslogieee128)
+
+void
+___ieee128_syslog_chk (int pri, int flag, const char *fmt, ...)
+{
+  va_list ap;
+
+  unsigned int mode = PRINTF_LDBL_USES_FLOAT128;
+  if (flag > 0)
+    mode |= PRINTF_FORTIFY;
+
+  va_start (ap, fmt);
+  __vsyslog_internal (pri, fmt, ap, mode);
+  va_end (ap);
+}
+strong_alias (___ieee128_syslog_chk, __syslog_chkieee128)
+
+void
+___ieee128_vsyslog_chk (int pri, int flag, const char *fmt, va_list ap)
+{
+  unsigned int mode = PRINTF_LDBL_USES_FLOAT128;
+  if (flag > 0)
+    mode |= PRINTF_FORTIFY;
+
+  __vsyslog_internal (pri, fmt, ap, mode);
+}
+strong_alias (___ieee128_vsyslog_chk, __vsyslog_chkieee128)

sysdeps/ieee754/ldbl-128ibm-compat/test-syslog-chk-ibm128.c

@@ -0,0 +1 @@
+#include <test-syslog-chk-ldbl-compat.c>

sysdeps/ieee754/ldbl-128ibm-compat/test-syslog-chk-ieee128.c

@@ -0,0 +1 @@
+#include <test-syslog-chk-ldbl-compat.c>

sysdeps/ieee754/ldbl-128ibm-compat/test-syslog-chk-ldbl-compat.c

@@ -0,0 +1,6 @@
+#define _FORTIFY_SOURCE 2
+#define SYSLOG_FUNCTION __syslog_chk
+#define SYSLOG_FUNCTION_PARAMS (LOG_DEBUG, 1, "%Lf\n", ld)
+#define VSYSLOG_FUNCTION __vsyslog_chk
+#define VSYSLOG_FUNCTION_PARAMS (LOG_DEBUG, 1, "%Lf\n", ap)
+#include <test-syslog-ldbl-compat-template.c>

sysdeps/ieee754/ldbl-128ibm-compat/test-syslog-ibm128.c

@@ -0,0 +1 @@
+#include <test-syslog-ldbl-compat.c>

sysdeps/ieee754/ldbl-128ibm-compat/test-syslog-ieee128.c

@@ -0,0 +1 @@
+#include <test-syslog-ldbl-compat.c>

sysdeps/ieee754/ldbl-128ibm-compat/test-syslog-ldbl-compat-template.c

@@ -0,0 +1,67 @@
+/* Test for the long double variants of *syslog* functions.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <syslog.h>
+
+#include <support/capture_subprocess.h>
+#include <support/check.h>
+
+static void
+do_test_one_call (void *last, ...)
+{
+  long double ld = -1;
+  va_list ap;
+
+  /* Make syslog functions write to stderr with LOG_PERROR, so that it
+     can be captured by support_capture_subprocess and verified.  */
+  openlog ("test-syslog", LOG_PERROR, LOG_USER);
+
+  /* Call syslog functions that take a format string.  */
+  SYSLOG_FUNCTION SYSLOG_FUNCTION_PARAMS;
+  va_start (ap, last);
+  VSYSLOG_FUNCTION VSYSLOG_FUNCTION_PARAMS;
+  va_end (ap);
+}
+
+static void
+do_test_call (void)
+{
+  long double ld = -1;
+  do_test_one_call (NULL, ld);
+}
+
+static int
+do_test (void)
+{
+  struct support_capture_subprocess result;
+  result = support_capture_subprocess ((void *) &do_test_call, NULL);
+
+  do_test_call ();
+
+  /* Compare against the expected output.  */
+  const char *expected =
+    "test-syslog: -1.000000\n"
+    "test-syslog: -1.000000\n";
+  TEST_COMPARE_STRING (expected, result.err.buffer);
+
+  return 0;
+}
+
+#include <support/test-driver.c>

sysdeps/ieee754/ldbl-128ibm-compat/test-syslog-ldbl-compat.c

@@ -0,0 +1,6 @@
+#define _FORTIFY_SOURCE 0
+#define SYSLOG_FUNCTION syslog
+#define SYSLOG_FUNCTION_PARAMS (LOG_DEBUG, "%Lf\n", ld)
+#define VSYSLOG_FUNCTION vsyslog
+#define VSYSLOG_FUNCTION_PARAMS (LOG_DEBUG, "%Lf\n", ap)
+#include <test-syslog-ldbl-compat-template.c>