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/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Written by Ulrich Drepper, <drepper@gnu.ai.mit.edu>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <alloca.h>
#include <langinfo.h>
#include "localeinfo.h"
#ifndef STRING_TYPE
# error STRING_TYPE not defined
#endif
#ifndef USTRING_TYPE
# error USTRING_TYPE not defined
#endif
typedef struct weight_t
{
struct weight_t *prev;
struct weight_t *next;
struct data_pair
{
int number;
const u_int32_t *value;
} data[0];
} weight_t;
/* The following five macros grant access to the values in the
collate locale file that do not depend on byte order. */
#define collate_nrules \
(_NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES))
#define collate_hash_size \
(_NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_HASH_SIZE))
#define collate_hash_layers \
(_NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_HASH_LAYERS))
#define collate_undefined \
(_NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_UNDEFINED))
#define collate_rules \
((u_int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_RULES))
static __inline void get_weight (const STRING_TYPE **str, weight_t *result);
static __inline void
get_weight (const STRING_TYPE **str, weight_t *result)
{
unsigned int ch = *((USTRING_TYPE *) (*str))++;
size_t slot;
if (sizeof (STRING_TYPE) == 1)
slot = ch * (collate_nrules + 1);
else
{
const size_t level_size = collate_hash_size * (collate_nrules + 1);
size_t level;
slot = (ch % collate_hash_size) * (collate_nrules + 1);
level = 0;
while (__collate_table[slot] != (u_int32_t) ch)
{
if (__collate_table[slot + 1] == 0
|| ++level >= collate_hash_layers)
{
size_t idx = collate_undefined;
size_t cnt;
for (cnt = 0; cnt < collate_nrules; ++cnt)
{
result->data[cnt].number = __collate_extra[idx++];
result->data[cnt].value = &__collate_extra[idx];
idx += result->data[cnt].number;
}
return;
}
slot += level_size;
}
}
if (__collate_table[slot + 1] != (u_int32_t) FORWARD_CHAR)
{
/* We have a simple form. One one value for each weight. */
size_t cnt;
for (cnt = 0; cnt < collate_nrules; ++cnt)
{
result->data[cnt].number = 1;
result->data[cnt].value = &__collate_table[slot + 1 + cnt];
}
return;
}
/* We now look for any collation element which starts with CH.
There might none, but the last list member is a catch-all case
because it is simple the character CH. The value of this entry
might be the same as UNDEFINED. */
slot = __collate_table[slot + 2];
while (1)
{
size_t idx;
/* This is a comparison between a u_int32_t array (aka wchar_t) and
an 8-bit string. */
for (idx = 0; __collate_extra[slot + 2 + idx] != 0; ++idx)
if (__collate_extra[slot + 2 + idx] != (u_int32_t) (*str)[idx])
break;
/* When the loop finished with all character of the collation
element used, we found the longest prefix. */
if (__collate_extra[slot + 2 + idx] == 0)
{
size_t cnt;
*str += idx;
idx += slot + 3;
for (cnt = 0; cnt < collate_nrules; ++cnt)
{
result->data[cnt].number = __collate_extra[idx++];
result->data[cnt].value = &__collate_extra[idx];
idx += result->data[cnt].number;
}
return;
}
/* To next entry in list. */
slot += __collate_extra[slot];
}
}
/* To process a string efficiently we retrieve all information about
the string at once. The following macro constructs a double linked
list of this information. It is a macro because we use `alloca'
and we use a double linked list because of the backward collation
order. */
#define get_string(str, forw, backw) \
do \
{ \
weight_t *newp; \
while (*str != '\0') \
{ \
newp = (weight_t *) alloca (sizeof (weight_t) \
+ (collate_nrules \
* sizeof (struct data_pair))); \
\
newp->prev = backw; \
if (backw == NULL) \
forw = newp; \
else \
backw->next = newp; \
newp->next = NULL; \
backw = newp; \
get_weight (&str, newp); \
} \
} \
while (0)
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