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bfff8b1b | 1 | /* Copyright (C) 1996-2017 Free Software Foundation, Inc. |
9eb157c8 UD |
2 | This file is part of the GNU C Library. |
3 | Written by Ulrich Drepper, <drepper@cygnus.com>. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9eb157c8 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
9eb157c8 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
9eb157c8 | 18 | |
8c0ab919 RM |
19 | #ifndef _WEIGHTWC_H_ |
20 | #define _WEIGHTWC_H_ 1 | |
21 | ||
9090848d | 22 | #include <libc-diag.h> |
bb5badf1 | 23 | |
9eb157c8 | 24 | /* Find index of weight. */ |
8c0ab919 RM |
25 | static inline int32_t __attribute__ ((always_inline)) |
26 | findidx (const int32_t *table, | |
27 | const int32_t *indirect, | |
28 | const wint_t *extra, | |
29 | const wint_t **cpp, size_t len) | |
9eb157c8 | 30 | { |
1c99f950 UD |
31 | wint_t ch = *(*cpp)++; |
32 | int32_t i = __collidx_table_lookup ((const char *) table, ch); | |
9eb157c8 UD |
33 | |
34 | if (i >= 0) | |
35 | /* This is an index into the weight table. Cool. */ | |
36 | return i; | |
37 | ||
38 | /* Oh well, more than one sequence starting with this byte. | |
39 | Search for the correct one. */ | |
701666b7 | 40 | const int32_t *cp = (const int32_t *) &extra[-i]; |
f3a6cc0a | 41 | --len; |
9eb157c8 UD |
42 | while (1) |
43 | { | |
44 | size_t nhere; | |
1c99f950 | 45 | const int32_t *usrc = (const int32_t *) *cpp; |
9eb157c8 UD |
46 | |
47 | /* The first thing is the index. */ | |
46661856 | 48 | i = *cp++; |
9eb157c8 UD |
49 | |
50 | /* Next is the length of the byte sequence. These are always | |
51 | short byte sequences so there is no reason to call any | |
52 | function (even if they are inlined). */ | |
53 | nhere = *cp++; | |
54 | ||
55 | if (i >= 0) | |
56 | { | |
57 | /* It is a single character. If it matches we found our | |
58 | index. Note that at the end of each list there is an | |
59 | entry of length zero which represents the single byte | |
60 | sequence. The first (and here only) byte was tested | |
61 | already. */ | |
62 | size_t cnt; | |
63 | ||
93fe09cb CD |
64 | /* With GCC 5.3 when compiling with -Os the compiler warns |
65 | that seq2.back_us, which becomes usrc, might be used | |
66 | uninitialized. This can't be true because we pass a length | |
67 | of -1 for len at the same time which means that this loop | |
68 | never executes. */ | |
69 | DIAG_PUSH_NEEDS_COMMENT; | |
70 | DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized"); | |
f3a6cc0a | 71 | for (cnt = 0; cnt < nhere && cnt < len; ++cnt) |
9eb157c8 UD |
72 | if (cp[cnt] != usrc[cnt]) |
73 | break; | |
93fe09cb | 74 | DIAG_POP_NEEDS_COMMENT; |
9eb157c8 UD |
75 | |
76 | if (cnt == nhere) | |
77 | { | |
78 | /* Found it. */ | |
79 | *cpp += nhere; | |
80 | return i; | |
81 | } | |
82 | ||
83 | /* Up to the next entry. */ | |
84 | cp += nhere; | |
85 | } | |
86 | else | |
87 | { | |
88 | /* This is a range of characters. First decide whether the | |
89 | current byte sequence lies in the range. */ | |
90 | size_t cnt; | |
740c2239 | 91 | size_t offset; |
9eb157c8 | 92 | |
f3a6cc0a | 93 | for (cnt = 0; cnt < nhere - 1 && cnt < len; ++cnt) |
9eb157c8 UD |
94 | if (cp[cnt] != usrc[cnt]) |
95 | break; | |
96 | ||
740c2239 UD |
97 | if (cnt < nhere - 1) |
98 | { | |
99 | cp += 2 * nhere; | |
100 | continue; | |
101 | } | |
102 | ||
103 | if (cp[nhere - 1] > usrc[nhere -1]) | |
9eb157c8 | 104 | { |
740c2239 UD |
105 | cp += 2 * nhere; |
106 | continue; | |
9eb157c8 UD |
107 | } |
108 | ||
740c2239 UD |
109 | if (cp[2 * nhere - 1] < usrc[nhere -1]) |
110 | { | |
111 | cp += 2 * nhere; | |
112 | continue; | |
113 | } | |
114 | ||
115 | /* This range matches the next characters. Now find | |
116 | the offset in the indirect table. */ | |
117 | offset = usrc[nhere - 1] - cp[nhere - 1]; | |
9eb157c8 | 118 | *cpp += nhere; |
740c2239 UD |
119 | |
120 | return indirect[-i + offset]; | |
9eb157c8 UD |
121 | } |
122 | } | |
123 | ||
124 | /* NOTREACHED */ | |
125 | return 0x43219876; | |
126 | } | |
8c0ab919 RM |
127 | |
128 | #endif /* weightwc.h */ |