Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 68 insertions, 0 deletions

diff --git a/REORG.TODO/stdlib/mblen.c b/REORG.TODO/stdlib/mblen.c
new file mode 100644
index 0000000000..b98bb915e4
--- /dev/null
+++ b/REORG.TODO/stdlib/mblen.c
@@ -0,0 +1,68 @@
+/* Copyright (C) 1991-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library 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 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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 the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+#include <gconv.h>
+#include <wcsmbs/wcsmbsload.h>
+
+
+/* Internal state.  */
+static mbstate_t state;
+
+/* Return the length of the multibyte character (if there is one)
+   at S which is no longer than N characters.
+   The ISO C standard says that the `mblen' function must not change
+   the state of the `mbtowc' function.  */
+int
+mblen (const char *s, size_t n)
+{
+  int result;
+
+  /* If S is NULL the function has to return null or not null
+     depending on the encoding having a state depending encoding or
+     not.  */
+  if (s == NULL)
+    {
+      const struct gconv_fcts *fcts;
+
+      /* Get the conversion functions.  */
+      fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
+
+      /* Reset the state.  */
+      memset (&state, '\0', sizeof state);
+
+      result = fcts->towc->__stateful;
+    }
+  else if (*s == '\0')
+    /* According to the ISO C 89 standard this is the expected behaviour.  */
+    result = 0;
+  else
+    {
+      memset (&state, '\0', sizeof state);
+
+      result = __mbrtowc (NULL, s, n, &state);
+
+      /* The `mbrtowc' functions tell us more than we need.  Fold the -1
+	 and -2 result into -1.  */
+      if (result < 0)
+	result = -1;
+    }
+
+  return result;
+}