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2b778ceb | 1 | /* Copyright (C) 2000-2021 Free Software Foundation, Inc. |
4295702f | 2 | This file is part of the GNU C Library. |
4295702f UD |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
4295702f UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
4295702f | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
4295702f UD |
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); | |
eac4282f | 49 | wcdigits[n] += from_level; |
4295702f | 50 | |
a1d84548 | 51 | if (wc == *wcdigits[n]) |
4295702f UD |
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 | { | |
a1d84548 | 69 | if (wc == *wcdigits[n]) |
4295702f UD |
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 | } | |
4295702f UD |
80 | } |
81 | ||
82 | /* If we reach this point no matching digit was found. */ | |
83 | return -1; | |
84 | } |