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/* Copyright (C) 2000-2023 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
<https://www.gnu.org/licenses/>. */
#include <assert.h>
#include <langinfo.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 int
indigitwc_value (wchar_t wc, int *decided)
{
int from_level;
int to_level;
const wchar_t *wcdigits[10];
int n;
if (*decided != -1)
from_level = to_level = *decided;
else
{
from_level = 0;
to_level = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_INDIGITS_WC_LEN) - 1;
assert (from_level <= to_level);
}
/* In this round we get the pointer to the digit strings and also perform
the first round of comparisons. */
for (n = 0; n < 10; ++n)
{
/* Get the string for the digits with value N. */
wcdigits[n] = _NL_CURRENT (LC_CTYPE, _NL_CTYPE_INDIGITS0_WC + n);
wcdigits[n] += from_level;
if (wc == *wcdigits[n])
{
/* Found it. */
if (*decided == -1)
*decided = 0;
return n;
}
/* Advance the pointer to the next string. */
++wcdigits[n];
}
/* Now perform the remaining tests. */
while (++from_level <= to_level)
{
/* Search all ten digits of this level. */
for (n = 0; n < 10; ++n)
{
if (wc == *wcdigits[n])
{
/* Found it. */
if (*decided == -1)
*decided = from_level;
return n;
}
/* Advance the pointer to the next string. */
++wcdigits[n];
}
}
/* If we reach this point no matching digit was found. */
return -1;
}
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