glibc/locale/outdigits.h

/* Copyright (C) 2000-2017 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.org>, 2000.

   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 <assert.h>
#include <langinfo.h>
#include <string.h>
#include "../locale/localeinfo.h"

/* Look up the value of the next multibyte character and return its numerical
   value if it is one of the digits known in the locale.  If *DECIDED is
   -1 this means it is not yet decided which form it is and we have to
   search through all available digits.  Otherwise we know which script
   the digits are from.  */
static inline char *
outdigit_value (char *s, int n)
{
  const char *outdigit;
  size_t dlen;

  assert (0 <= n && n <= 9);
  outdigit = _NL_CURRENT (LC_CTYPE, _NL_CTYPE_OUTDIGIT0_MB + n);
  dlen = strlen (outdigit);

  s -= dlen;
  while (dlen-- > 0)
    s[dlen] = outdigit[dlen];

  return s;
}