error, warn, warnx: Use __fxprintf for wide printing [BZ #23519]

Also introduce the __vfxprintf function.

1 files changed, 88 insertions, 0 deletions

diff --git a/misc/tst-warn-wide.c b/misc/tst-warn-wide.c
new file mode 100644
index 0000000000..773bbba8d5
--- /dev/null
+++ b/misc/tst-warn-wide.c
@@ -0,0 +1,88 @@
+/* Test wide output conversion for warn.
+   Copyright (C) 2018 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 <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <support/check.h>
+#include <support/xmemstream.h>
+#include <wchar.h>
+
+/* Used to trigger the large-string path in __fxprintf.  */
+#define PADDING \
+  "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" \
+  "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" \
+  "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
+
+#define LPADDING \
+  L"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"  \
+  "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" \
+  "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
+
+
+static void
+one_test (const char *message, int error_code, const wchar_t *expected)
+{
+  wchar_t *buffer = NULL;
+  size_t length = 0;
+  FILE *fp = open_wmemstream (&buffer, &length);
+  TEST_VERIFY_EXIT (fp != NULL);
+  FILE *old_stderr = stderr;
+  stderr = fp;
+  errno = error_code;
+  switch (error_code)
+    {
+    case E2BIG:
+      warn ("%s with padding " PADDING, message);
+      break;
+    case EAGAIN:
+      warn ("%s", message);
+      break;
+    case -1:
+      warnx ("%s", message);
+      break;
+    case -2:
+      warnx ("%s with padding " PADDING, message);
+      break;
+    }
+  stderr = old_stderr;
+  TEST_VERIFY_EXIT (!ferror (fp));
+  TEST_COMPARE (fclose (fp), 0);
+  if (wcscmp (buffer, expected) != 0)
+    FAIL_EXIT1 ("unexpected output: %ls", buffer);
+  free (buffer);
+}
+
+static int
+do_test (void)
+{
+  one_test ("no errno", -1,
+            L"tst-warn-wide: no errno\n");
+  one_test ("no errno", -2,
+            L"tst-warn-wide: no errno with padding " PADDING "\n");
+  one_test ("with errno", EAGAIN,
+            L"tst-warn-wide: with errno: Resource temporarily unavailable\n");
+  one_test ("with errno", E2BIG,
+            L"tst-warn-wide: with errno with padding " PADDING
+            ": Argument list too long\n");
+  return 0;
+}
+
+#include <support/test-driver.c>