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>

1 files changed, 67 insertions, 0 deletions

diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/test-syslog-ldbl-compat-template.c b/sysdeps/ieee754/ldbl-128ibm-compat/test-syslog-ldbl-compat-template.c
new file mode 100644
index 0000000000..fe8acb4054
--- /dev/null
+++ b/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>