| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Access functions for CNS 11643, plane 2 handling. |
| 2 | Copyright (C) 1998-2016 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. |
| 5 | |
| 6 | The GNU C Library is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2.1 of the License, or (at your option) any later version. |
| 10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | Lesser General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include <stdint.h> |
| 21 | #include <gconv.h> |
| 22 | |
| 23 | /* Table for CNS 11643, plane 2 to UCS4 conversion. */ |
| 24 | extern const uint16_t __cns11643l2_to_ucs4_tab[]; |
| 25 | |
| 26 | |
| 27 | static inline uint32_t |
| 28 | __attribute ((always_inline)) |
| 29 | cns11643l2_to_ucs4 (const unsigned char **s, size_t avail, |
| 30 | unsigned char offset) |
| 31 | { |
| 32 | unsigned char ch = *(*s); |
| 33 | unsigned char ch2; |
| 34 | int idx; |
| 35 | |
| 36 | if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) > 0x7d) |
| 37 | return __UNKNOWN_10646_CHAR; |
| 38 | |
| 39 | if (avail < 2) |
| 40 | return 0; |
| 41 | |
| 42 | ch2 = (*s)[1]; |
| 43 | if ((ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f) |
| 44 | return __UNKNOWN_10646_CHAR; |
| 45 | |
| 46 | idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset); |
| 47 | if (idx > 0x1de1) |
| 48 | return __UNKNOWN_10646_CHAR; |
| 49 | |
| 50 | (*s) += 2; |
| 51 | |
| 52 | return __cns11643l2_to_ucs4_tab[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR); |
| 53 | } |
| 54 | |
| 55 | |
| 56 | /* The table which contains the CNS 11643 level 2 mappings. */ |
| 57 | extern const char __cns11643_from_ucs4p0_tab[][3]; |
| 58 | |
| 59 | |
| 60 | static inline size_t |
| 61 | __attribute ((always_inline)) |
| 62 | ucs4_to_cns11643l2 (uint32_t wch, unsigned char *s, size_t avail) |
| 63 | { |
| 64 | unsigned int ch = (unsigned int) wch; |
| 65 | const char *cp = NULL; |
| 66 | |
| 67 | if (ch >= 0x4e07 && ch <= 0x9fa4) |
| 68 | { |
| 69 | cp = __cns11643_from_ucs4p0_tab[ch - 0x3400]; |
| 70 | if (cp[0] == '\2') |
| 71 | ++cp; |
| 72 | else |
| 73 | cp = NULL; |
| 74 | } |
| 75 | |
| 76 | if (cp == NULL) |
| 77 | return __UNKNOWN_10646_CHAR; |
| 78 | |
| 79 | if (avail < 2) |
| 80 | return 0; |
| 81 | |
| 82 | s[0] = cp[0]; |
| 83 | s[1] = cp[1]; |
| 84 | |
| 85 | return 2; |
| 86 | } |