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6d7e8eda | 1 | /* Copyright (C) 1996-2023 Free Software Foundation, Inc. |
9eb157c8 | 2 | This file is part of the GNU C Library. |
9eb157c8 UD |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
9eb157c8 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
9eb157c8 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
9eb157c8 | 17 | |
8c0ab919 RM |
18 | #ifndef _WEIGHTWC_H_ |
19 | #define _WEIGHTWC_H_ 1 | |
20 | ||
9090848d | 21 | #include <libc-diag.h> |
bb5badf1 | 22 | |
9eb157c8 | 23 | /* Find index of weight. */ |
8c0ab919 RM |
24 | static inline int32_t __attribute__ ((always_inline)) |
25 | findidx (const int32_t *table, | |
26 | const int32_t *indirect, | |
27 | const wint_t *extra, | |
28 | const wint_t **cpp, size_t len) | |
9eb157c8 | 29 | { |
02f2fead JM |
30 | /* With GCC 7 when compiling with -Os the compiler warns that |
31 | seq1.back_us and seq2.back_us, which become *cpp, might be used | |
32 | uninitialized. This is impossible as this function cannot be | |
33 | called except in cases where those fields have been | |
34 | initialized. */ | |
35 | DIAG_PUSH_NEEDS_COMMENT; | |
36 | DIAG_IGNORE_Os_NEEDS_COMMENT (7, "-Wmaybe-uninitialized"); | |
1c99f950 | 37 | wint_t ch = *(*cpp)++; |
02f2fead | 38 | DIAG_POP_NEEDS_COMMENT; |
1c99f950 | 39 | int32_t i = __collidx_table_lookup ((const char *) table, ch); |
9eb157c8 UD |
40 | |
41 | if (i >= 0) | |
42 | /* This is an index into the weight table. Cool. */ | |
43 | return i; | |
44 | ||
45 | /* Oh well, more than one sequence starting with this byte. | |
46 | Search for the correct one. */ | |
701666b7 | 47 | const int32_t *cp = (const int32_t *) &extra[-i]; |
f3a6cc0a | 48 | --len; |
9eb157c8 UD |
49 | while (1) |
50 | { | |
51 | size_t nhere; | |
1c99f950 | 52 | const int32_t *usrc = (const int32_t *) *cpp; |
9eb157c8 UD |
53 | |
54 | /* The first thing is the index. */ | |
46661856 | 55 | i = *cp++; |
9eb157c8 UD |
56 | |
57 | /* Next is the length of the byte sequence. These are always | |
58 | short byte sequences so there is no reason to call any | |
59 | function (even if they are inlined). */ | |
60 | nhere = *cp++; | |
61 | ||
62 | if (i >= 0) | |
63 | { | |
64 | /* It is a single character. If it matches we found our | |
65 | index. Note that at the end of each list there is an | |
66 | entry of length zero which represents the single byte | |
67 | sequence. The first (and here only) byte was tested | |
68 | already. */ | |
69 | size_t cnt; | |
70 | ||
93fe09cb CD |
71 | /* With GCC 5.3 when compiling with -Os the compiler warns |
72 | that seq2.back_us, which becomes usrc, might be used | |
73 | uninitialized. This can't be true because we pass a length | |
74 | of -1 for len at the same time which means that this loop | |
75 | never executes. */ | |
76 | DIAG_PUSH_NEEDS_COMMENT; | |
77 | DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized"); | |
f3a6cc0a | 78 | for (cnt = 0; cnt < nhere && cnt < len; ++cnt) |
9eb157c8 UD |
79 | if (cp[cnt] != usrc[cnt]) |
80 | break; | |
93fe09cb | 81 | DIAG_POP_NEEDS_COMMENT; |
9eb157c8 UD |
82 | |
83 | if (cnt == nhere) | |
84 | { | |
85 | /* Found it. */ | |
86 | *cpp += nhere; | |
87 | return i; | |
88 | } | |
89 | ||
90 | /* Up to the next entry. */ | |
91 | cp += nhere; | |
92 | } | |
93 | else | |
94 | { | |
95 | /* This is a range of characters. First decide whether the | |
96 | current byte sequence lies in the range. */ | |
97 | size_t cnt; | |
740c2239 | 98 | size_t offset; |
9eb157c8 | 99 | |
ce999220 JM |
100 | /* With GCC 7 when compiling with -Os the compiler warns |
101 | that seq1.back_us and seq2.back_us, which become usrc, | |
102 | might be used uninitialized. This is impossible for the | |
103 | same reason as described above. */ | |
104 | DIAG_PUSH_NEEDS_COMMENT; | |
105 | DIAG_IGNORE_Os_NEEDS_COMMENT (7, "-Wmaybe-uninitialized"); | |
f3a6cc0a | 106 | for (cnt = 0; cnt < nhere - 1 && cnt < len; ++cnt) |
9eb157c8 UD |
107 | if (cp[cnt] != usrc[cnt]) |
108 | break; | |
ce999220 | 109 | DIAG_POP_NEEDS_COMMENT; |
9eb157c8 | 110 | |
9c79cec8 | 111 | if (cnt < nhere - 1 || cnt == len) |
740c2239 UD |
112 | { |
113 | cp += 2 * nhere; | |
114 | continue; | |
115 | } | |
116 | ||
02f2fead JM |
117 | /* With GCC 7 when compiling with -Os the compiler warns |
118 | that seq1.back_us and seq2.back_us, which become usrc, | |
119 | might be used uninitialized. This is impossible for the | |
120 | same reason as described above. */ | |
121 | DIAG_PUSH_NEEDS_COMMENT; | |
122 | DIAG_IGNORE_Os_NEEDS_COMMENT (7, "-Wmaybe-uninitialized"); | |
9c79cec8 | 123 | if (cp[nhere - 1] > usrc[nhere - 1]) |
9eb157c8 | 124 | { |
740c2239 UD |
125 | cp += 2 * nhere; |
126 | continue; | |
9eb157c8 | 127 | } |
02f2fead | 128 | DIAG_POP_NEEDS_COMMENT; |
9eb157c8 | 129 | |
9c79cec8 | 130 | if (cp[2 * nhere - 1] < usrc[nhere - 1]) |
740c2239 UD |
131 | { |
132 | cp += 2 * nhere; | |
133 | continue; | |
134 | } | |
135 | ||
136 | /* This range matches the next characters. Now find | |
137 | the offset in the indirect table. */ | |
138 | offset = usrc[nhere - 1] - cp[nhere - 1]; | |
9eb157c8 | 139 | *cpp += nhere; |
740c2239 UD |
140 | |
141 | return indirect[-i + offset]; | |
9eb157c8 UD |
142 | } |
143 | } | |
144 | ||
145 | /* NOTREACHED */ | |
146 | return 0x43219876; | |
147 | } | |
8c0ab919 RM |
148 | |
149 | #endif /* weightwc.h */ |