1 files changed, 94 insertions, 0 deletions
diff --git a/StdLib/LibC/Stdio/vswprintf.c b/StdLib/LibC/Stdio/vswprintf.c
new file mode 100644
index 0000000000..6d4cc3e656
--- /dev/null
+++ b/StdLib/LibC/Stdio/vswprintf.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
+ * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+  FreeBSD: src/lib/libc/stdio/vswprintf.c,v 1.6 2005/02/21 19:41:44 fjoe Exp
+  NetBSD: vswprintf.c,v 1.1 2005/05/14 23:51:02 christos Exp
+ */
+#include  <LibConfig.h>
+#include  <sys/EfiCdefs.h>
+
+#include  <errno.h>
+#include  <stdio.h>
+#include  <stdlib.h>
+#include  <wchar.h>
+#include  <stdarg.h>
+#include  "reentrant.h"
+#include  "local.h"
+
+int
+vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
+    va_list ap)
+{
+  static const mbstate_t initial = { 0 };
+  mbstate_t mbs;
+  FILE f;
+  char *mbp;
+  int ret, sverrno;
+  size_t nwc;
+  struct __sfileext fext;
+
+  if (n == 0) {
+    errno = EINVAL;
+    return (-1);
+  }
+
+  _FILEEXT_SETUP(&f, &fext);
+  f._file = -1;
+  f._flags = __SWR | __SSTR | __SALC;
+  f._bf._base = f._p = (unsigned char *)malloc(128);
+  if (f._bf._base == NULL) {
+    errno = ENOMEM;
+    return (-1);
+  }
+  f._bf._size = f._w = 127;   /* Leave room for the NUL */
+  ret = __vfwprintf_unlocked(&f, fmt, ap);
+  if (ret < 0) {
+    sverrno = errno;
+    free(f._bf._base);
+    errno = sverrno;
+    return (-1);
+  }
+  *f._p = '\0';
+  mbp = (char *)f._bf._base;
+  /*
+   * XXX Undo the conversion from wide characters to multibyte that
+   * fputwc() did in __vfwprintf().
+   */
+  mbs = initial;
+  nwc = mbsrtowcs(s, (const char **)&mbp, n, &mbs);
+  free(f._bf._base);
+  if (nwc == (size_t)-1) {
+    errno = EILSEQ;
+    return (-1);
+  }
+  if (nwc == n) {
+    s[n - 1] = L'\0';
+    errno = EOVERFLOW;
+    return (-1);
+  }
+
+  return (ret);
+}