| File: | bidi.c |
| Warning: | line 65, column 12 Although the value stored to 'bc' is used in the enclosing expression, the value is never actually read from 'bc' |
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| 1 | /* bidi.c - IDNA right to left checking functions |
| 2 | Copyright (C) 2011-2025 Simon Josefsson |
| 3 | |
| 4 | Libidn2 is free software: you can redistribute it and/or modify it |
| 5 | under the terms of either: |
| 6 | |
| 7 | * the GNU Lesser General Public License as published by the Free |
| 8 | Software Foundation; either version 3 of the License, or (at |
| 9 | your option) any later version. |
| 10 | |
| 11 | or |
| 12 | |
| 13 | * the GNU General Public License as published by the Free |
| 14 | Software Foundation; either version 2 of the License, or (at |
| 15 | your option) any later version. |
| 16 | |
| 17 | or both in parallel, as here. |
| 18 | |
| 19 | This program is distributed in the hope that it will be useful, |
| 20 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | GNU General Public License for more details. |
| 23 | |
| 24 | You should have received copies of the GNU General Public License and |
| 25 | the GNU Lesser General Public License along with this program. If |
| 26 | not, see <http://www.gnu.org/licenses/>. |
| 27 | */ |
| 28 | |
| 29 | #include <config.h> |
| 30 | |
| 31 | #include "idn2.h" |
| 32 | |
| 33 | #include <sys/types.h> |
| 34 | #include <stdbool.h> |
| 35 | |
| 36 | #include "bidi.h" |
| 37 | |
| 38 | #include <unictype.h> |
| 39 | |
| 40 | static bool_Bool |
| 41 | _isBidi (const uint32_t *label, size_t llen) |
| 42 | { |
| 43 | for (; (ssize_t) llen > 0; llen--) |
| 44 | { |
| 45 | int bc = uc_bidi_category (*label++); |
| 46 | |
| 47 | if (bc == UC_BIDI_R || bc == UC_BIDI_AL || bc == UC_BIDI_AN) |
| 48 | return 1; |
| 49 | } |
| 50 | |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | /* IDNA2008 BIDI check (RFC 5893) */ |
| 55 | int |
| 56 | _idn2_bidi (const uint32_t *label, size_t llen) |
| 57 | { |
| 58 | int bc; |
| 59 | int endok = 1; |
| 60 | |
| 61 | if (!_isBidi (label, llen)) |
| 62 | return IDN2_OK; |
| 63 | |
| 64 | // 2.1 |
| 65 | switch ((bc = uc_bidi_category (*label))) |
Although the value stored to 'bc' is used in the enclosing expression, the value is never actually read from 'bc' | |
| 66 | { |
| 67 | case UC_BIDI_L: |
| 68 | // check 2.5 & 2.6 |
| 69 | for (size_t it = 1; it < llen; it++) |
| 70 | { |
| 71 | bc = uc_bidi_category (label[it]); |
| 72 | |
| 73 | if (bc == UC_BIDI_L || bc == UC_BIDI_EN || bc == UC_BIDI_NSM) |
| 74 | { |
| 75 | endok = 1; |
| 76 | } |
| 77 | else |
| 78 | { |
| 79 | if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET |
| 80 | && bc != UC_BIDI_ON && bc != UC_BIDI_BN) |
| 81 | { |
| 82 | /* printf("LTR label contains invalid code point\n"); */ |
| 83 | return IDN2_BIDI; |
| 84 | } |
| 85 | endok = 0; |
| 86 | } |
| 87 | } |
| 88 | /* printf("LTR label ends with invalid code point\n"); */ |
| 89 | return endok ? IDN2_OK : IDN2_BIDI; |
| 90 | |
| 91 | case UC_BIDI_R: |
| 92 | case UC_BIDI_AL: |
| 93 | // check 2.2, 2.3, 2.4 |
| 94 | /* printf("Label[0]=%04X: %s\n", label[0], uc_bidi_category_name(bc)); */ |
| 95 | for (size_t it = 1; it < llen; it++) |
| 96 | { |
| 97 | bc = uc_bidi_category (label[it]); |
| 98 | |
| 99 | /* printf("Label[%d]=%04X: %s\n", (int) it, label[it], uc_bidi_category_name(bc)); */ |
| 100 | if (bc == UC_BIDI_R || bc == UC_BIDI_AL || bc == UC_BIDI_EN |
| 101 | || bc == UC_BIDI_AN || bc == UC_BIDI_NSM) |
| 102 | { |
| 103 | endok = 1; |
| 104 | } |
| 105 | else |
| 106 | { |
| 107 | if (bc != UC_BIDI_ES && bc != UC_BIDI_CS && bc != UC_BIDI_ET |
| 108 | && bc != UC_BIDI_ON && bc != UC_BIDI_BN) |
| 109 | { |
| 110 | /* printf("RTL label contains invalid code point\n"); */ |
| 111 | return IDN2_BIDI; |
| 112 | } |
| 113 | endok = 0; |
| 114 | } |
| 115 | } |
| 116 | /* printf("RTL label ends with invalid code point\n"); */ |
| 117 | return endok ? IDN2_OK : IDN2_BIDI; |
| 118 | |
| 119 | default: |
| 120 | /* printf("Label begins with invalid BIDI class %s\n", uc_bidi_category_name(bc)); */ |
| 121 | return IDN2_BIDI; |
| 122 | } |
| 123 | } |