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85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
/* Copyright (C) 2000-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <langinfo.h>
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/* Look up the value of the next multibyte character and return its numerical
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value if it is one of the digits known in the locale. If *DECIDED is
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-1 this means it is not yet decided which form it is and we have to
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search through all available digits. Otherwise we know which script
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the digits are from. */
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static inline int
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indigitwc_value (wchar_t wc, int *decided)
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{
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int from_level;
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int to_level;
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const wchar_t *wcdigits[10];
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int n;
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if (*decided != -1)
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from_level = to_level = *decided;
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else
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{
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from_level = 0;
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to_level = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_INDIGITS_WC_LEN) - 1;
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assert (from_level <= to_level);
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}
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/* In this round we get the pointer to the digit strings and also perform
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the first round of comparisons. */
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for (n = 0; n < 10; ++n)
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{
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/* Get the string for the digits with value N. */
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wcdigits[n] = _NL_CURRENT (LC_CTYPE, _NL_CTYPE_INDIGITS0_WC + n);
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wcdigits[n] += from_level;
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if (wc == *wcdigits[n])
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{
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/* Found it. */
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if (*decided == -1)
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*decided = 0;
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return n;
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}
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/* Advance the pointer to the next string. */
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++wcdigits[n];
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}
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/* Now perform the remaining tests. */
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while (++from_level <= to_level)
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{
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/* Search all ten digits of this level. */
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for (n = 0; n < 10; ++n)
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{
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if (wc == *wcdigits[n])
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{
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/* Found it. */
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if (*decided == -1)
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*decided = from_level;
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return n;
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}
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/* Advance the pointer to the next string. */
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++wcdigits[n];
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}
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}
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/* If we reach this point no matching digit was found. */
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return -1;
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}
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