]>
Commit | Line | Data |
---|---|---|
15a2315c | 1 | /* Access functions for CNS 11643, plane 2 handling. |
04277e02 | 2 | Copyright (C) 1998-2019 Free Software Foundation, Inc. |
15a2315c UD |
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 | |
41bdb6e2 AJ |
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. | |
15a2315c UD |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
15a2315c | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
15a2315c UD |
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 | |
25337753 | 28 | __attribute ((always_inline)) |
15a2315c UD |
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. */ | |
289ac9dd | 57 | extern const char __cns11643_from_ucs4p0_tab[][3]; |
15a2315c UD |
58 | |
59 | ||
60 | static inline size_t | |
25337753 | 61 | __attribute ((always_inline)) |
15a2315c UD |
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 | { | |
289ac9dd | 69 | cp = __cns11643_from_ucs4p0_tab[ch - 0x3400]; |
15a2315c UD |
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 | } |