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 indigitwc_value(wchar_t wc,int * decided)27indigitwc_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