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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 | #include <string.h> |
| 21 | |
| 22 | /* Look up the value of the next multibyte character and return its numerical |
| 23 | value if it is one of the digits known in the locale. If *DECIDED is |
| 24 | -1 this means it is not yet decided which form it is and we have to |
| 25 | search through all available digits. Otherwise we know which script |
| 26 | the digits are from. */ |
| 27 | static inline int |
| 28 | indigit_value (const char **s, size_t *len, int *decided) |
| 29 | { |
| 30 | int from_level; |
| 31 | int to_level; |
| 32 | const char *mbdigits[10]; |
| 33 | int i; |
| 34 | int n; |
| 35 | |
| 36 | if (*decided != -1) |
| 37 | from_level = to_level = *decided; |
| 38 | else |
| 39 | { |
| 40 | from_level = 0; |
| 41 | to_level = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_INDIGITS_MB_LEN) - 1; |
| 42 | assert (from_level <= to_level); |
| 43 | } |
| 44 | |
| 45 | /* In this round we get the pointer to the digit strings and also perform |
| 46 | the first round of comparisons. */ |
| 47 | for (n = 0; n < 10; ++n) |
| 48 | { |
| 49 | size_t dlen; |
| 50 | |
| 51 | /* Get the string for the digits with value N. */ |
| 52 | mbdigits[n] = _NL_CURRENT (LC_CTYPE, _NL_CTYPE_INDIGITS0_MB + n); |
| 53 | dlen = strlen (mbdigits[n]); |
| 54 | |
| 55 | if (from_level == 0 && dlen <= *len |
| 56 | && memcmp (*s, mbdigits[n], dlen) == 0) |
| 57 | { |
| 58 | /* Found it. */ |
| 59 | *s += dlen; |
| 60 | *len -= dlen; |
| 61 | if (*decided == -1) |
| 62 | *decided = 0; |
| 63 | return n; |
| 64 | } |
| 65 | |
| 66 | /* Advance the pointer to the next string. */ |
| 67 | mbdigits[n] += dlen + 1; |
| 68 | } |
| 69 | |
| 70 | /* Now perform the remaining tests. */ |
| 71 | for (i = 1; i <= to_level; ++i) |
| 72 | { |
| 73 | /* Search all ten digits of this level. */ |
| 74 | for (n = 0; n < 10; ++n) |
| 75 | { |
| 76 | size_t dlen = strlen (mbdigits[n]); |
| 77 | |
| 78 | if (i >= from_level && dlen <= *len |
| 79 | && memcmp (*s, mbdigits[n], dlen) == 0) |
| 80 | { |
| 81 | /* Found it. */ |
| 82 | *s += dlen; |
| 83 | *len -= dlen; |
| 84 | if (*decided == -1) |
| 85 | *decided = from_level; |
| 86 | return n; |
| 87 | } |
| 88 | |
| 89 | /* Advance the pointer to the next string. */ |
| 90 | mbdigits[n] += dlen + 1; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | /* If we reach this point no matching digit was found. */ |
| 95 | return -1; |
| 96 | } |
| 97 |
Warning: This file is not a C or C++ file. It does not have highlighting.