1 files changed, 29 insertions, 0 deletions
diff --git a/newlib/libc/stdlib/mbstowcs_r.c b/newlib/libc/stdlib/mbstowcs_r.c
new file mode 100644
index 00000000000..5478849bb44
--- /dev/null
+++ b/newlib/libc/stdlib/mbstowcs_r.c
@@ -0,0 +1,29 @@
+#include <stdlib.h>
+
+size_t
+_DEFUN (_mbstowcs_r, (reent, pwcs, s, n, state),
+        struct _reent *r    _AND         
+        wchar_t       *pwcs _AND
+        const char    *s    _AND
+        size_t         n    _AND
+        int           *state)
+{
+  wchar_t *ptr = pwcs;
+  size_t max = n;
+  char *t = (char *)s;
+  int bytes;
+
+  while (n > 0)
+    {
+      bytes = _mbtowc_r (r, ptr, t, MB_CUR_MAX, state);
+      if (bytes == -1)
+        return -1;
+      else if (bytes == 0)
+        return ptr - pwcs;
+      t += bytes;
+      ++ptr;
+      --n;
+    }
+
+  return max;
+}