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bfff8b1b | 1 | /* Copyright (C) 2000-2017 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@gnu.org>, 2000. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
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6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
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9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
4295702f | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
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18 | |
19 | #include <assert.h> | |
20 | #include <langinfo.h> | |
21 | #include <string.h> | |
22 | ||
23 | /* Look up the value of the next multibyte character and return its numerical | |
24 | value if it is one of the digits known in the locale. If *DECIDED is | |
25 | -1 this means it is not yet decided which form it is and we have to | |
26 | search through all available digits. Otherwise we know which script | |
27 | the digits are from. */ | |
28 | static inline int | |
29 | indigit_value (const char **s, size_t *len, int *decided) | |
30 | { | |
31 | int from_level; | |
32 | int to_level; | |
33 | const char *mbdigits[10]; | |
eac4282f | 34 | int i; |
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35 | int n; |
36 | ||
37 | if (*decided != -1) | |
38 | from_level = to_level = *decided; | |
39 | else | |
40 | { | |
41 | from_level = 0; | |
42 | to_level = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_INDIGITS_MB_LEN) - 1; | |
43 | assert (from_level <= to_level); | |
44 | } | |
45 | ||
46 | /* In this round we get the pointer to the digit strings and also perform | |
47 | the first round of comparisons. */ | |
48 | for (n = 0; n < 10; ++n) | |
49 | { | |
50 | size_t dlen; | |
51 | ||
52 | /* Get the string for the digits with value N. */ | |
53 | mbdigits[n] = _NL_CURRENT (LC_CTYPE, _NL_CTYPE_INDIGITS0_MB + n); | |
54 | dlen = strlen (mbdigits[n]); | |
55 | ||
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56 | if (from_level == 0 && dlen <= *len |
57 | && memcmp (*s, mbdigits[n], dlen) == 0) | |
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58 | { |
59 | /* Found it. */ | |
60 | *s += dlen; | |
eac4282f | 61 | *len -= dlen; |
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62 | if (*decided == -1) |
63 | *decided = 0; | |
64 | return n; | |
65 | } | |
66 | ||
67 | /* Advance the pointer to the next string. */ | |
68 | mbdigits[n] += dlen + 1; | |
69 | } | |
70 | ||
71 | /* Now perform the remaining tests. */ | |
eac4282f | 72 | for (i = 1; i <= to_level; ++i) |
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73 | { |
74 | /* Search all ten digits of this level. */ | |
75 | for (n = 0; n < 10; ++n) | |
76 | { | |
77 | size_t dlen = strlen (mbdigits[n]); | |
78 | ||
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79 | if (i >= from_level && dlen <= *len |
80 | && memcmp (*s, mbdigits[n], dlen) == 0) | |
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81 | { |
82 | /* Found it. */ | |
83 | *s += dlen; | |
eac4282f | 84 | *len -= dlen; |
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85 | if (*decided == -1) |
86 | *decided = from_level; | |
87 | return n; | |
88 | } | |
89 | ||
90 | /* Advance the pointer to the next string. */ | |
91 | mbdigits[n] += dlen + 1; | |
92 | } | |
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93 | } |
94 | ||
95 | /* If we reach this point no matching digit was found. */ | |
96 | return -1; | |
97 | } |