1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Written by Ulrich Drepper, <drepper@gnu.ai.mit.edu>.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
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
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
22 #include "localeinfo.h"
25 # error STRING_TYPE not defined
29 # error USTRING_TYPE not defined
32 typedef struct weight_t
34 struct weight_t *prev;
35 struct weight_t *next;
39 const u_int32_t *value;
44 /* The following five macros grant access to the values in the
45 collate locale file that do not depend on byte order. */
46 #define collate_nrules \
47 (_NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES))
48 #define collate_hash_size \
49 (_NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_HASH_SIZE))
50 #define collate_hash_layers \
51 (_NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_HASH_LAYERS))
52 #define collate_undefined \
53 (_NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_UNDEFINED))
54 #define collate_rules \
55 ((u_int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_RULES))
58 static __inline int get_weight (const STRING_TYPE **str, weight_t *result);
60 get_weight (const STRING_TYPE **str, weight_t *result)
62 unsigned int ch = *((USTRING_TYPE *) (*str))++;
65 if (sizeof (STRING_TYPE) == 1)
66 slot = ch * (collate_nrules + 1);
69 const size_t level_size = collate_hash_size * (collate_nrules + 1);
72 slot = (ch % collate_hash_size) * (collate_nrules + 1);
75 while (__collate_table[slot] != (u_int32_t) ch)
77 if (__collate_table[slot + 1] == 0
78 || ++level >= collate_hash_layers)
80 size_t idx = collate_undefined;
83 for (cnt = 0; cnt < collate_nrules; ++cnt)
85 result->data[cnt].number = __collate_extra[idx++];
86 result->data[cnt].value = &__collate_extra[idx];
87 idx += result->data[cnt].number;
95 if (__collate_table[slot + 1] != (u_int32_t) FORWARD_CHAR)
97 /* We have a simple form. One one value for each weight. */
100 for (cnt = 0; cnt < collate_nrules; ++cnt)
102 result->data[cnt].number = 1;
103 result->data[cnt].value = &__collate_table[slot + 1 + cnt];
108 /* We now look for any collation element which starts with CH.
109 There might none, but the last list member is a catch-all case
110 because it is simple the character CH. The value of this entry
111 might be the same as UNDEFINED. */
112 slot = __collate_table[slot + 2];
118 /* This is a comparison between a u_int32_t array (aka wchar_t) and
120 for (idx = 0; __collate_extra[slot + 2 + idx] != 0; ++idx)
121 if (__collate_extra[slot + 2 + idx] != (u_int32_t) (*str)[idx])
124 /* When the loop finished with all character of the collation
125 element used, we found the longest prefix. */
126 if (__collate_extra[slot + 2 + idx] == 0)
132 for (cnt = 0; cnt < collate_nrules; ++cnt)
134 result->data[cnt].number = __collate_extra[idx++];
135 result->data[cnt].value = &__collate_extra[idx];
136 idx += result->data[cnt].number;
141 /* To next entry in list. */
142 slot += __collate_extra[slot];
145 return 0; /* To calm down gcc. */
149 /* To process a string efficiently we retrieve all information about
150 the string at once. The following macro constructs a double linked
151 list of this information. It is a macro because we use `alloca'
152 and we use a double linked list because of the backward collation
154 #define get_string(str, forw, backw) \
160 newp = (weight_t *) alloca (sizeof (weight_t) \
162 * sizeof (struct data_pair))); \
164 newp->prev = backw; \
168 backw->next = newp; \
172 while (get_weight (&str, newp) == 0); \