glibc/iconv/gconv_trans.c
2000-06-21 23:21:55 +00:00

401 lines
11 KiB
C

/* Transliteration using the locale's data.
Copyright (C) 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
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 <dlfcn.h>
#include <search.h>
#include <stdint.h>
#include <string.h>
#include <bits/libc-lock.h>
#include "gconv_int.h"
#include "../locale/localeinfo.h"
int
__gconv_transliterate (struct __gconv_step *step,
struct __gconv_step_data *step_data,
void *trans_data __attribute__ ((unused)),
const unsigned char *inbufstart,
const unsigned char **inbufp,
const unsigned char *inbufend,
unsigned char **outbufstart, size_t *irreversible)
{
/* Find out about the locale's transliteration. */
uint_fast32_t size;
uint_fast32_t layers;
uint32_t *from_idx;
uint32_t *from_tbl;
uint32_t *to_idx;
uint32_t *to_tbl;
uint32_t *winbuf;
uint32_t *winbufend;
uint_fast32_t low;
uint_fast32_t high;
uint32_t *default_missing;
/* The input buffer. There are actually 4-byte values. */
winbuf = (uint32_t *) *inbufp;
winbufend = (uint32_t *) inbufend;
/* If there is no transliteration information in the locale don't do
anything and return the error. */
size = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_TRANSLIT_HASH_SIZE);
if (size == 0)
goto no_rules;
/* Get the rest of the values. */
layers = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_TRANSLIT_HASH_LAYERS);
from_idx = (uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_FROM_IDX);
from_tbl = (uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_FROM_TBL);
to_idx = (uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_TO_IDX);
to_tbl = (uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_TO_TBL);
/* Test whether there is enough input. */
if (winbuf + 1 > winbufend)
return (winbuf == winbufend
? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT);
/* The array starting at FROM_IDX contains indeces to the string table
in FROM_TBL. The indeces are sorted wrt to the strings. I.e., we
are doing binary search. */
low = 0;
high = size;
while (low < high)
{
uint_fast32_t med = (low + high) / 2;
uint32_t idx;
int cnt;
/* Compare the string at this index with the string at the current
position in the input buffer. */
idx = from_idx[med];
cnt = 0;
do
{
if (from_tbl[idx + cnt] != winbuf[cnt])
/* Does not match. */
break;
++cnt;
}
while (from_tbl[idx + cnt] != L'\0' && winbuf + cnt < winbufend);
if (cnt > 0 && from_tbl[idx + cnt] == L'\0')
{
/* Found a matching input sequence. Now try to convert the
possible replacements. */
uint32_t idx2 = to_idx[med];
do
{
/* Determine length of replacement. */
uint_fast32_t len = 0;
int res;
const unsigned char *toinptr;
while (to_tbl[idx2 + len] != L'\0')
++len;
/* Try this input text. */
toinptr = (const unsigned char *) &to_tbl[idx2];
res = DL_CALL_FCT (step->__fct,
(step, step_data, &toinptr,
(const unsigned char *) &to_tbl[idx2 + len],
(unsigned char **) outbufstart,
irreversible, 0, 0));
if (res != __GCONV_ILLEGAL_INPUT)
{
/* If the conversion succeeds we have to increment the
input buffer. */
if (res == __GCONV_EMPTY_INPUT)
{
*inbufp += cnt * sizeof (uint32_t);
++*irreversible;
res = __GCONV_OK;
}
return res;
}
/* Next replacement. */
idx2 += len + 1;
}
while (to_tbl[idx2] != L'\0');
/* Nothing found, continue searching. */
}
else if (cnt > 0)
/* This means that the input buffer contents matches a prefix of
an entry. Since we cannot match it unless we get more input,
we will tell the caller about it. */
return __GCONV_INCOMPLETE_INPUT;
if (winbuf + cnt >= winbufend || from_tbl[idx + cnt] < winbuf[cnt])
low = idx;
else
high = idx;
}
no_rules:
/* Maybe the character is supposed to be ignored. */
if (_NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_TRANSLIT_IGNORE_LEN) != 0)
{
int n = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_TRANSLIT_IGNORE_LEN);
uint32_t *ranges = (uint32_t *) _NL_CURRENT (LC_CTYPE,
_NL_CTYPE_TRANSLIT_IGNORE);
uint32_t wc = *(uint32_t *) (*inbufp);
int i;
/* Test whether there is enough input. */
if (winbuf + 1 > winbufend)
return (winbuf == winbufend
? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT);
for (i = 0; i < n; ranges += 3, ++i)
if (ranges[0] <= wc && wc <= ranges[1]
&& (wc - ranges[0]) % ranges[2] == 0)
{
/* Matches the range. Ignore it. */
*inbufp += 4;
++*irreversible;
return __GCONV_OK;
}
else if (wc < ranges[0])
/* There cannot be any other matching range since they are
sorted. */
break;
}
/* One last chance: use the default replacement. */
default_missing = (uint32_t *)
_NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_DEFAULT_MISSING);
if (default_missing[0] != L'\0')
{
const unsigned char *toinptr = (const unsigned char *) default_missing;
uint32_t len = _NL_CURRENT_WORD (LC_CTYPE,
_NL_CTYPE_TRANSLIT_DEFAULT_MISSING_LEN);
int res;
/* Test whether there is enough input. */
if (winbuf + 1 > winbufend)
return (winbuf == winbufend
? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT);
res = DL_CALL_FCT (step->__fct,
(step, step_data, &toinptr,
(const unsigned char *) (default_missing + len),
(unsigned char **) outbufstart,
irreversible, 0, 0));
if (res != __GCONV_ILLEGAL_INPUT)
{
/* If the conversion succeeds we have to increment the
input buffer. */
if (res == __GCONV_EMPTY_INPUT)
{
/* This worked but is not reversible. */
++*irreversible;
*inbufp += 4;
res = __GCONV_OK;
}
return res;
}
}
/* Haven't found a match. */
return __GCONV_ILLEGAL_INPUT;
}
/* Structure to represent results of found (or not) transliteration
modules. */
struct known_trans
{
/* This structure must remain the first member. */
struct trans_struct info;
const char *fname;
void *handle;
int open_count;
};
/* Tree with results of previous calls to __gconv_translit_find. */
static void *search_tree;
/* We modify global data. */
__libc_lock_define_initialized (static, lock);
/* Compare two transliteration entries. */
static int
trans_compare (const void *p1, const void *p2)
{
struct known_trans *s1 = (struct known_trans *) p1;
struct known_trans *s2 = (struct known_trans *) p2;
return strcmp (s1->info.name, s2->info.name);
}
/* Open (maybe reopen) the module named in the struct. Get the function
and data structure pointers we need. */
static int
open_translit (struct known_trans *trans)
{
__gconv_trans_query_fct queryfct;
trans->handle = __libc_dlopen (trans->fname);
if (trans->handle == NULL)
/* Not available. */
return 1;
/* Find the required symbol. */
queryfct = __libc_dlsym (trans->handle, "gconv_trans_context");
if (queryfct == NULL)
{
/* We cannot live with that. */
close_and_out:
__libc_dlclose (trans->handle);
trans->handle = NULL;
return 1;
}
/* Get the context. */
if (queryfct (trans->info.name, &trans->info.csnames, &trans->info.ncsnames)
!= 0)
goto close_and_out;
/* Of course we also have to have the actual function. */
trans->info.trans_fct = __libc_dlsym (trans->handle, "gconv_trans");
if (trans->info.trans_fct == NULL)
goto close_and_out;
/* Now the optional functions. */
trans->info.trans_init_fct =
__libc_dlsym (trans->handle, "gconv_trans_init");
trans->info.trans_context_fct =
__libc_dlsym (trans->handle, "gconv_trans_context");
trans->info.trans_end_fct =
__libc_dlsym (trans->handle, "gconv_trans_end");
trans->open_count = 1;
return 0;
}
int
internal_function
__gconv_translit_find (struct trans_struct *trans)
{
struct known_trans **found;
const struct path_elem *runp;
int res = 1;
/* We have to have a name. */
assert (trans->name != NULL);
/* Acquire the lock. */
__libc_lock_lock (lock);
/* See whether we know this module already. */
found = __tfind (trans, &search_tree, trans_compare);
if (found != NULL)
{
/* Is this module available? */
if ((*found)->handle != NULL)
{
/* Maybe we have to reopen the file. */
if ((*found)->handle != (void *) -1)
/* The object is not unloaded. */
res = 0;
else if (open_translit (*found) == 0)
{
/* Copy the data. */
*trans = (*found)->info;
res = 0;
}
}
}
else
{
size_t name_len = strlen (trans->name) + 1;
int need_so = 0;
struct known_trans *newp;
/* We have to continue looking for the module. */
if (__gconv_path_elem == NULL)
__gconv_get_path ();
/* See whether we have to append .so. */
if (name_len <= 3 || memcmp (&trans->name[name_len - 3], ".so", 3) != 0)
need_so = 1;
/* Create a new entry. */
newp = (struct known_trans *) malloc (sizeof (struct known_trans)
+ (__gconv_max_path_elem_len
+ name_len + 3)
+ name_len);
if (newp != NULL)
{
char *cp;
/* Clear the struct. */
memset (newp, '\0', sizeof (struct known_trans));
/* Store a copy of the module name. */
newp->info.name = (char *) (newp + 1);
cp = __mempcpy ((char *) newp->info.name, trans->name, name_len);
newp->fname = cp;
/* Seach in all the directories. */
for (runp = __gconv_path_elem; runp->name != NULL; ++runp)
{
cp = __mempcpy (__stpcpy ((char *) newp->fname, runp->name),
trans->name, name_len);
if (need_so)
memcpy (cp, ".so", sizeof (".so"));
if (open_translit (newp) == 0)
{
/* We found a module. */
res = 0;
break;
}
}
/* In any case we'll add the entry to our search tree. */
if (__tsearch (newp, &search_tree, trans_compare) == NULL)
{
/* Yickes, this should not happen. Unload the object. */
res = 1;
/* XXX unload here. */
}
}
}
__libc_lock_unlock (lock);
return res;
}