1 files changed, 52 insertions, 0 deletions
diff --git a/lib/unistdio/u-vsnprintf.h b/lib/unistdio/u-vsnprintf.h
new file mode 100644
index 00000000..481a22f0
--- /dev/null
+++ b/lib/unistdio/u-vsnprintf.h
@@ -0,0 +1,52 @@
+/* Formatted output to strings.
+   Copyright (C) 1999, 2002, 2006-2008 Free Software Foundation, Inc.
+
+   This program 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 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+int
+VSNPRINTF (DCHAR_T *buf, size_t size, const FCHAR_T *format, va_list args)
+{
+  size_t length;
+  DCHAR_T *result;
+
+  if (size == 0)
+    buf = NULL;
+  else
+    length = size;
+  result = VASNPRINTF (buf, &length, format, args);
+  if (result == NULL)
+    return -1;
+
+  if (result != buf)
+    {
+      if (size != 0)
+	{
+	  /* The result did not fit into the buffer.  Copy the initial segment
+	     into the buffer, truncating it if necessary.  */
+	  size_t n = (length < size ? length : size - 1);
+	  DCHAR_CPY (buf, result, n);
+	  buf[n] = '\0';
+	}
+      free (result);
+    }
+
+  if (length > INT_MAX)
+    {
+      errno = EOVERFLOW;
+      return -1;
+    }
+
+  /* Return the number of resulting units, excluding the trailing NUL.  */
+  return length;
+}