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1 | /* Copyright (C) 2000-2022 Free Software Foundation, Inc. |
---|---|
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <assert.h> |
19 | #include <langinfo.h> |
20 | |
21 | /* Look up the value of the next multibyte character and return its numerical |
22 | value if it is one of the digits known in the locale. If *DECIDED is |
23 | -1 this means it is not yet decided which form it is and we have to |
24 | search through all available digits. Otherwise we know which script |
25 | the digits are from. */ |
26 | static inline int |
27 | indigitwc_value (wchar_t wc, int *decided) |
28 | { |
29 | int from_level; |
30 | int to_level; |
31 | const wchar_t *wcdigits[10]; |
32 | int n; |
33 | |
34 | if (*decided != -1) |
35 | from_level = to_level = *decided; |
36 | else |
37 | { |
38 | from_level = 0; |
39 | to_level = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_INDIGITS_WC_LEN) - 1; |
40 | assert (from_level <= to_level); |
41 | } |
42 | |
43 | /* In this round we get the pointer to the digit strings and also perform |
44 | the first round of comparisons. */ |
45 | for (n = 0; n < 10; ++n) |
46 | { |
47 | /* Get the string for the digits with value N. */ |
48 | wcdigits[n] = _NL_CURRENT (LC_CTYPE, _NL_CTYPE_INDIGITS0_WC + n); |
49 | wcdigits[n] += from_level; |
50 | |
51 | if (wc == *wcdigits[n]) |
52 | { |
53 | /* Found it. */ |
54 | if (*decided == -1) |
55 | *decided = 0; |
56 | return n; |
57 | } |
58 | |
59 | /* Advance the pointer to the next string. */ |
60 | ++wcdigits[n]; |
61 | } |
62 | |
63 | /* Now perform the remaining tests. */ |
64 | while (++from_level <= to_level) |
65 | { |
66 | /* Search all ten digits of this level. */ |
67 | for (n = 0; n < 10; ++n) |
68 | { |
69 | if (wc == *wcdigits[n]) |
70 | { |
71 | /* Found it. */ |
72 | if (*decided == -1) |
73 | *decided = from_level; |
74 | return n; |
75 | } |
76 | |
77 | /* Advance the pointer to the next string. */ |
78 | ++wcdigits[n]; |
79 | } |
80 | } |
81 | |
82 | /* If we reach this point no matching digit was found. */ |
83 | return -1; |
84 | } |
85 |
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