newlib: wide char support

git-svn-id: svn://kolibrios.org@6607 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/newlib/libc/stdlib/mbstowcs_r.c

@@ -0,0 +1,38 @@
+#include <stdlib.h>
+#include <wchar.h>
+#include "local.h"
+
+size_t
+_DEFUN (_mbstowcs_r, (reent, pwcs, s, n, state),
+        struct _reent *r    _AND         
+        wchar_t       *__restrict pwcs _AND
+        const char    *__restrict s    _AND
+        size_t         n    _AND
+        mbstate_t     *state)
+{
+  size_t ret = 0;
+  char *t = (char *)s;
+  int bytes;
+
+  if (!pwcs)
+    n = (size_t) 1; /* Value doesn't matter as long as it's not 0. */
+  while (n > 0)
+    {
+      bytes = __mbtowc (r, pwcs, t, MB_CUR_MAX, __locale_charset (), state);
+      if (bytes < 0)
+	{
+	  state->__count = 0;
+	  return -1;
+	}
+      else if (bytes == 0)
+	break;
+      t += bytes;
+      ++ret;
+      if (pwcs)
+	{
+	  ++pwcs;
+	  --n;
+	}
+    }
+  return ret;
+}