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/* Transliteration using the locale's data.
Copyright (C) 2000-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <assert.h>
#include <dlfcn.h>
#include <search.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <libc-lock.h>
#include "gconv_int.h"
#include "../locale/localeinfo.h"
#include <pointer_guard.h>
int
__gconv_transliterate (struct __gconv_step *step,
struct __gconv_step_data *step_data,
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. */
uint32_t size;
const uint32_t *from_idx;
const uint32_t *from_tbl;
const uint32_t *to_idx;
const uint32_t *to_tbl;
const uint32_t *winbuf;
const uint32_t *winbufend;
uint32_t low;
uint32_t high;
/* The input buffer. There are actually 4-byte values. */
winbuf = (const uint32_t *) *inbufp;
winbufend = (const uint32_t *) inbufend;
__gconv_fct fct = step->__fct;
if (step->__shlib_handle != NULL)
PTR_DEMANGLE (fct);
/* 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_TAB_SIZE);
if (size == 0)
goto no_rules;
/* Get the rest of the values. */
from_idx =
(const uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_FROM_IDX);
from_tbl =
(const uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_FROM_TBL);
to_idx =
(const uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_TO_IDX);
to_tbl =
(const 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 indices to the string table
in FROM_TBL. The indices are sorted wrt to the strings. I.e., we
are doing binary search. */
low = 0;
high = size;
while (low < high)
{
uint32_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. */
unsigned int len = 0;
int res;
const unsigned char *toinptr;
unsigned char *outptr;
while (to_tbl[idx2 + len] != L'\0')
++len;
/* Try this input text. */
toinptr = (const unsigned char *) &to_tbl[idx2];
outptr = *outbufstart;
res = DL_CALL_FCT (fct,
(step, step_data, &toinptr,
(const unsigned char *) &to_tbl[idx2 + len],
&outptr, NULL, 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;
}
/* Do not increment the output pointer if we could not
store the entire output. */
if (res != __GCONV_FULL_OUTPUT)
*outbufstart = outptr;
return res;
}
/* Next replacement. */
idx2 += len + 1;
}
while (to_tbl[idx2] != L'\0');
/* Nothing found, continue searching. */
}
else if (cnt > 0 && winbuf + cnt == winbufend)
/* 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 = med + 1;
else
high = med;
}
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);
const uint32_t *ranges =
(const uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_IGNORE);
const uint32_t wc = *(const 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. */
if (_NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_TRANSLIT_DEFAULT_MISSING_LEN) != 0)
{
const uint32_t *default_missing = (const uint32_t *)
_NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_DEFAULT_MISSING);
const unsigned char *toinptr = (const unsigned char *) default_missing;
uint32_t len = _NL_CURRENT_WORD (LC_CTYPE,
_NL_CTYPE_TRANSLIT_DEFAULT_MISSING_LEN);
unsigned char *outptr;
int res;
/* Test whether there is enough input. */
if (winbuf + 1 > winbufend)
return (winbuf == winbufend
? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT);
outptr = *outbufstart;
res = DL_CALL_FCT (fct,
(step, step_data, &toinptr,
(const unsigned char *) (default_missing + len),
&outptr, NULL, 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;
}
*outbufstart = outptr;
return res;
}
}
/* Haven't found a match. */
return __GCONV_ILLEGAL_INPUT;
}
libc_hidden_def (__gconv_transliterate)
|
