newlib: wide char support

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

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

@@ -0,0 +1,33 @@
+#include <wchar.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <reent.h>
+#include <string.h>
+#include "local.h"
+
+wint_t
+btowc (int c)
+{
+  mbstate_t mbs;
+  int retval = 0;
+  wchar_t pwc;
+  unsigned char b;
+
+  if (c == EOF)
+    return WEOF;
+
+  b = (unsigned char)c;
+
+  /* Put mbs in initial state. */
+  memset (&mbs, '\0', sizeof (mbs));
+
+  _REENT_CHECK_MISC(_REENT);
+
+  retval = __mbtowc (_REENT, &pwc, (const char *) &b, 1,
+		     __locale_charset (), &mbs);
+
+  if (retval != 0 && retval != 1)
+    return WEOF;
+
+  return (wint_t)pwc;
+}