glibc/string/strcoll.c

549 lines
14 KiB
C

/* Copyright (C) 1995, 96, 97, 98, 99, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Written by Ulrich Drepper <drepper@cygnus.com>, 1995.
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 <assert.h>
#include <langinfo.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#ifndef STRING_TYPE
# define STRING_TYPE char
# define USTRING_TYPE unsigned char
# ifdef USE_IN_EXTENDED_LOCALE_MODEL
# define STRCOLL __strcoll_l
# else
# define STRCOLL strcoll
# endif
# define STRCMP strcmp
# define STRLEN strlen
# define WEIGHT_H "../locale/weight.h"
# define SUFFIX MB
# define L(arg) arg
#endif
#define CONCAT(a,b) CONCAT1(a,b)
#define CONCAT1(a,b) a##b
#include "../locale/localeinfo.h"
#ifndef USE_IN_EXTENDED_LOCALE_MODEL
int
STRCOLL (s1, s2)
const STRING_TYPE *s1;
const STRING_TYPE *s2;
#else
int
STRCOLL (s1, s2, l)
const STRING_TYPE *s1;
const STRING_TYPE *s2;
__locale_t l;
#endif
{
#ifdef USE_IN_EXTENDED_LOCALE_MODEL
struct locale_data *current = l->__locales[LC_COLLATE];
uint_fast32_t nrules = *((const uint32_t *) current->values[_NL_ITEM_INDEX (_NL_COLLATE_NRULES)].string);
#else
uint_fast32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
#endif
/* We don't assign the following values right away since it might be
unnecessary in case there are no rules. */
const unsigned char *rulesets;
const int32_t *table;
const USTRING_TYPE *weights;
const USTRING_TYPE *extra;
const int32_t *indirect;
uint_fast32_t pass;
int result = 0;
const USTRING_TYPE *us1;
const USTRING_TYPE *us2;
size_t s1len;
size_t s2len;
int32_t *idx1arr;
int32_t *idx2arr;
unsigned char *rule1arr;
unsigned char *rule2arr;
size_t idx1max;
size_t idx2max;
size_t idx1cnt;
size_t idx2cnt;
size_t idx1now;
size_t idx2now;
size_t backw1_stop;
size_t backw2_stop;
size_t backw1;
size_t backw2;
int val1;
int val2;
int position;
int seq1len;
int seq2len;
int use_malloc;
#include WEIGHT_H
if (nrules == 0)
return STRCMP (s1, s2);
#ifdef USE_IN_EXTENDED_LOCALE_MODEL
rulesets = (const unsigned char *)
current->values[_NL_ITEM_INDEX (_NL_COLLATE_RULESETS)].string;
table = (const int32_t *)
current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_TABLE,SUFFIX))].string;
weights = (const USTRING_TYPE *)
current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_WEIGHT,SUFFIX))].string;
extra = (const USTRING_TYPE *)
current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_EXTRA,SUFFIX))].string;
indirect = (const int32_t *)
current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_INDIRECT,SUFFIX))].string;
#else
rulesets = (const unsigned char *)
_NL_CURRENT (LC_COLLATE, _NL_COLLATE_RULESETS);
table = (const int32_t *)
_NL_CURRENT (LC_COLLATE, CONCAT(_NL_COLLATE_TABLE,SUFFIX));
weights = (const USTRING_TYPE *)
_NL_CURRENT (LC_COLLATE, CONCAT(_NL_COLLATE_WEIGHT,SUFFIX));
extra = (const USTRING_TYPE *)
_NL_CURRENT (LC_COLLATE, CONCAT(_NL_COLLATE_EXTRA,SUFFIX));
indirect = (const int32_t *)
_NL_CURRENT (LC_COLLATE, CONCAT(_NL_COLLATE_INDIRECT,SUFFIX));
#endif
use_malloc = 0;
assert (((uintptr_t) table) % __alignof__ (table[0]) == 0);
assert (((uintptr_t) weights) % __alignof__ (weights[0]) == 0);
assert (((uintptr_t) extra) % __alignof__ (extra[0]) == 0);
assert (((uintptr_t) indirect) % __alignof__ (indirect[0]) == 0);
/* We need this a few times. */
s1len = STRLEN (s1);
s2len = STRLEN (s2);
/* We need the elements of the strings as unsigned values since they
are used as indeces. */
us1 = (const USTRING_TYPE *) s1;
us2 = (const USTRING_TYPE *) s2;
/* Perform the first pass over the string and while doing this find
and store the weights for each character. Since we want this to
be as fast as possible we are using `alloca' to store the temporary
values. But since there is no limit on the length of the string
we have to use `malloc' if the string is too long. We should be
very conservative here.
Please note that the localedef programs makes sure that `position'
is not used at the first level. */
if (s1len + s2len >= 16384)
{
idx1arr = (int32_t *) malloc ((s1len + s2len) * (sizeof (int32_t) + 1));
idx2arr = &idx1arr[s2len];
rule1arr = (unsigned char *) &idx2arr[s2len];
rule2arr = &rule1arr[s1len];
if (idx1arr == NULL)
/* No memory. Well, go with the stack then.
XXX Once this implementation is stable we will handle this
differently. Instead of precomputing the indeces we will
do this in time. This means, though, that this happens for
every pass again. */
goto try_stack;
use_malloc = 1;
}
else
{
try_stack:
idx1arr = (int32_t *) alloca (s1len * sizeof (int32_t));
idx2arr = (int32_t *) alloca (s2len * sizeof (int32_t));
rule1arr = (unsigned char *) alloca (s2len);
rule2arr = (unsigned char *) alloca (s2len);
}
idx1cnt = 0;
idx2cnt = 0;
idx1max = 0;
idx2max = 0;
idx1now = 0;
idx2now = 0;
backw1_stop = ~0ul;
backw2_stop = ~0ul;
backw1 = ~0ul;
backw2 = ~0ul;
seq1len = 0;
seq2len = 0;
position = rulesets[0] & sort_position;
while (1)
{
val1 = 0;
val2 = 0;
/* Get the next non-IGNOREd element for string `s1'. */
if (seq1len == 0)
do
{
++val1;
if (backw1_stop != ~0ul)
{
/* The is something pushed. */
if (backw1 == backw1_stop)
{
/* The last pushed character was handled. Continue
with forward characters. */
if (idx1cnt < idx1max)
idx1now = idx1cnt;
else
/* Nothing anymore. The backward sequence ended with
the last sequence in the string. Note that seq1len
is still zero. */
break;
}
else
idx1now = --backw1;
}
else
{
backw1_stop = idx1max;
while (*us1 != L('\0'))
{
int32_t tmp = findidx (&us1);
rule1arr[idx1max] = tmp >> 24;
idx1arr[idx1max] = tmp & 0xffffff;
idx1cnt = idx1max++;
if ((rulesets[rule1arr[idx1cnt] * nrules]
& sort_backward) == 0)
/* No more backward characters to push. */
break;
++idx1cnt;
}
if (backw1_stop >= idx1cnt)
{
/* No sequence at all or just one. */
if (idx1cnt == idx1max || backw1_stop > idx1cnt)
/* Note that seq1len is still zero. */
break;
backw1_stop = ~0ul;
idx1now = idx1cnt;
}
else
/* We pushed backward sequences. */
idx1now = backw1 = idx1cnt - 1;
}
}
while ((seq1len = weights[idx1arr[idx1now]++]) == 0);
/* And the same for string `s2'. */
if (seq2len == 0)
do
{
++val2;
if (backw2_stop != ~0ul)
{
/* The is something pushed. */
if (backw2 == backw2_stop)
{
/* The last pushed character was handled. Continue
with forward characters. */
if (idx2cnt < idx2max)
idx2now = idx2cnt;
else
/* Nothing anymore. The backward sequence ended with
the last sequence in the string. Note that seq2len
is still zero. */
break;
}
else
idx2now = --backw2;
}
else
{
backw2_stop = idx2max;
while (*us2 != L('\0'))
{
int32_t tmp = findidx (&us2);
rule2arr[idx2max] = tmp >> 24;
idx2arr[idx2max] = tmp & 0xffffff;
idx2cnt = idx2max++;
if ((rulesets[rule2arr[idx2cnt] * nrules]
& sort_backward) == 0)
/* No more backward characters to push. */
break;
++idx2cnt;
}
if (backw2_stop >= idx2cnt)
{
/* No sequence at all or just one. */
if (idx2cnt == idx2max || backw2_stop > idx2cnt)
/* Note that seq1len is still zero. */
break;
backw2_stop = ~0ul;
idx2now = idx2cnt;
}
else
/* We pushed backward sequences. */
idx2now = backw2 = idx2cnt - 1;
}
}
while ((seq2len = weights[idx2arr[idx2now]++]) == 0);
/* See whether any or both strings are empty. */
if (seq1len == 0 || seq2len == 0)
{
if (seq1len == seq2len)
/* Both ended. So far so good, both strings are equal at the
first level. */
break;
/* This means one string is shorter than the other. Find out
which one and return an appropriate value. */
result = seq1len == 0 ? -1 : 1;
goto free_and_return;
}
/* Test for position if necessary. */
if (position && val1 != val2)
{
result = val1 - val2;
goto free_and_return;
}
/* Compare the two sequences. */
do
{
if (weights[idx1arr[idx1now]] != weights[idx2arr[idx2now]])
{
/* The sequences differ. */
result = weights[idx1arr[idx1now]] - weights[idx2arr[idx2now]];
goto free_and_return;
}
/* Increment the offsets. */
++idx1arr[idx1now];
++idx2arr[idx2now];
--seq1len;
--seq2len;
}
while (seq1len > 0 && seq2len > 0);
if (position && seq1len != seq2len)
{
result = seq1len - seq2len;
goto free_and_return;
}
}
/* Now the remaining passes over the weights. We now use the
indeces we found before. */
for (pass = 1; pass < nrules; ++pass)
{
/* We assume that if a rule has defined `position' in one section
this is true for all of them. */
idx1cnt = 0;
idx2cnt = 0;
backw1_stop = ~0ul;
backw2_stop = ~0ul;
backw1 = ~0ul;
backw2 = ~0ul;
position = rulesets[rule1arr[0] * nrules + pass] & sort_position;
while (1)
{
val1 = 0;
val2 = 0;
/* Get the next non-IGNOREd element for string `s1'. */
if (seq1len == 0)
do
{
++val1;
if (backw1_stop != ~0ul)
{
/* The is something pushed. */
if (backw1 == backw1_stop)
{
/* The last pushed character was handled. Continue
with forward characters. */
if (idx1cnt < idx1max)
idx1now = idx1cnt;
else
{
/* Nothing anymore. The backward sequence
ended with the last sequence in the string. */
idx1now = ~0ul;
break;
}
}
else
idx1now = --backw1;
}
else
{
backw1_stop = idx1cnt;
while (idx1cnt < idx1max)
{
if ((rulesets[rule1arr[idx1cnt] * nrules + pass]
& sort_backward) == 0)
/* No more backward characters to push. */
break;
++idx1cnt;
}
if (backw1_stop == idx1cnt)
{
/* No sequence at all or just one. */
if (idx1cnt == idx1max)
/* Note that seq2len is still zero. */
break;
backw1_stop = ~0ul;
idx1now = idx1cnt++;
}
else
/* We pushed backward sequences. */
idx1now = backw1 = idx1cnt - 1;
}
}
while ((seq1len = weights[idx1arr[idx1now]++]) == 0);
/* And the same for string `s2'. */
if (seq2len == 0)
do
{
++val2;
if (backw2_stop != ~0ul)
{
/* The is something pushed. */
if (backw2 == backw2_stop)
{
/* The last pushed character was handled. Continue
with forward characters. */
if (idx2cnt < idx2max)
idx2now = idx2cnt;
else
{
/* Nothing anymore. The backward sequence
ended with the last sequence in the string. */
idx2now = ~0ul;
break;
}
}
else
idx2now = --backw2;
}
else
{
backw2_stop = idx2cnt;
while (idx2cnt < idx2max)
{
if ((rulesets[rule2arr[idx2cnt] * nrules + pass]
& sort_backward) == 0)
/* No more backward characters to push. */
break;
++idx2cnt;
}
if (backw2_stop == idx2cnt)
{
/* No sequence at all or just one. */
if (idx2cnt == idx2max)
/* Note that seq2len is still zero. */
break;
backw2_stop = ~0ul;
idx2now = idx2cnt++;
}
else
/* We pushed backward sequences. */
idx2now = backw2 = idx2cnt - 1;
}
}
while ((seq2len = weights[idx2arr[idx2now]++]) == 0);
/* See whether any or both strings are empty. */
if (seq1len == 0 || seq2len == 0)
{
if (seq1len == seq2len)
/* Both ended. So far so good, both strings are equal
at this level. */
break;
/* This means one string is shorter than the other. Find out
which one and return an appropriate value. */
result = seq1len == 0 ? -1 : 1;
goto free_and_return;
}
/* Test for position if necessary. */
if (position && val1 != val2)
{
result = val1 - val2;
goto free_and_return;
}
/* Compare the two sequences. */
do
{
if (weights[idx1arr[idx1now]] != weights[idx2arr[idx2now]])
{
/* The sequences differ. */
result = (weights[idx1arr[idx1now]]
- weights[idx2arr[idx2now]]);
goto free_and_return;
}
/* Increment the offsets. */
++idx1arr[idx1now];
++idx2arr[idx2now];
--seq1len;
--seq2len;
}
while (seq1len > 0 && seq2len > 0);
if (position && seq1len != seq2len)
{
result = seq1len - seq2len;
goto free_and_return;
}
}
}
/* Free the memory if needed. */
free_and_return:
if (use_malloc)
free (idx1arr);
return result;
}