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1b14353ee3
2009-02-02 Ulrich Drepper <drepper@redhat.com> [BZ #9793] * iconv/gconv_trans.c (__gconv_transliterate): Don't change *OUTBUFSTART unless the whole output fit into the buffer. * iconv/Makefile (tests): Add tst-iconv4. * iconv/tst-iconv4.c: New file.
420 lines
11 KiB
C
420 lines
11 KiB
C
/* Transliteration using the locale's data.
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Copyright (C) 2000, 2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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#include <dlfcn.h>
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#include <search.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include <bits/libc-lock.h>
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#include "gconv_int.h"
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#include "../locale/localeinfo.h"
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int
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__gconv_transliterate (struct __gconv_step *step,
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struct __gconv_step_data *step_data,
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void *trans_data __attribute__ ((unused)),
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const unsigned char *inbufstart,
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const unsigned char **inbufp,
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const unsigned char *inbufend,
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unsigned char **outbufstart, size_t *irreversible)
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{
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/* Find out about the locale's transliteration. */
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uint_fast32_t size;
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const uint32_t *from_idx;
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const uint32_t *from_tbl;
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const uint32_t *to_idx;
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const uint32_t *to_tbl;
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const uint32_t *winbuf;
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const uint32_t *winbufend;
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uint_fast32_t low;
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uint_fast32_t high;
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/* The input buffer. There are actually 4-byte values. */
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winbuf = (const uint32_t *) *inbufp;
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winbufend = (const uint32_t *) inbufend;
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__gconv_fct fct = step->__fct;
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#ifdef PTR_DEMANGLE
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if (step->__shlib_handle != NULL)
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PTR_DEMANGLE (fct);
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#endif
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/* If there is no transliteration information in the locale don't do
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anything and return the error. */
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size = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_TRANSLIT_TAB_SIZE);
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if (size == 0)
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goto no_rules;
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/* Get the rest of the values. */
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from_idx =
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(const uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_FROM_IDX);
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from_tbl =
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(const uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_FROM_TBL);
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to_idx =
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(const uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_TO_IDX);
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to_tbl =
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(const uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_TO_TBL);
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/* Test whether there is enough input. */
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if (winbuf + 1 > winbufend)
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return (winbuf == winbufend
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? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT);
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/* The array starting at FROM_IDX contains indeces to the string table
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in FROM_TBL. The indeces are sorted wrt to the strings. I.e., we
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are doing binary search. */
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low = 0;
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high = size;
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while (low < high)
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{
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uint_fast32_t med = (low + high) / 2;
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uint32_t idx;
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int cnt;
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/* Compare the string at this index with the string at the current
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position in the input buffer. */
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idx = from_idx[med];
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cnt = 0;
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do
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{
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if (from_tbl[idx + cnt] != winbuf[cnt])
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/* Does not match. */
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break;
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++cnt;
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}
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while (from_tbl[idx + cnt] != L'\0' && winbuf + cnt < winbufend);
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if (cnt > 0 && from_tbl[idx + cnt] == L'\0')
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{
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/* Found a matching input sequence. Now try to convert the
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possible replacements. */
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uint32_t idx2 = to_idx[med];
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do
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{
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/* Determine length of replacement. */
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uint_fast32_t len = 0;
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int res;
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const unsigned char *toinptr;
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unsigned char *outptr;
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while (to_tbl[idx2 + len] != L'\0')
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++len;
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/* Try this input text. */
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toinptr = (const unsigned char *) &to_tbl[idx2];
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outptr = *outbufstart;
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res = DL_CALL_FCT (fct,
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(step, step_data, &toinptr,
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(const unsigned char *) &to_tbl[idx2 + len],
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&outptr, NULL, 0, 0));
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if (res != __GCONV_ILLEGAL_INPUT)
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{
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/* If the conversion succeeds we have to increment the
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input buffer. */
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if (res == __GCONV_EMPTY_INPUT)
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{
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*inbufp += cnt * sizeof (uint32_t);
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++*irreversible;
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res = __GCONV_OK;
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}
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/* Do not increment the output pointer if we could not
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store the entire output. */
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if (res != __GCONV_FULL_OUTPUT)
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*outbufstart = outptr;
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return res;
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}
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/* Next replacement. */
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idx2 += len + 1;
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}
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while (to_tbl[idx2] != L'\0');
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/* Nothing found, continue searching. */
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}
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else if (cnt > 0)
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/* This means that the input buffer contents matches a prefix of
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an entry. Since we cannot match it unless we get more input,
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we will tell the caller about it. */
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return __GCONV_INCOMPLETE_INPUT;
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if (winbuf + cnt >= winbufend || from_tbl[idx + cnt] < winbuf[cnt])
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low = med + 1;
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else
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high = med;
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}
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no_rules:
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/* Maybe the character is supposed to be ignored. */
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if (_NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_TRANSLIT_IGNORE_LEN) != 0)
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{
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int n = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_TRANSLIT_IGNORE_LEN);
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const uint32_t *ranges =
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(const uint32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_IGNORE);
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const uint32_t wc = *(const uint32_t *) (*inbufp);
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int i;
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/* Test whether there is enough input. */
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if (winbuf + 1 > winbufend)
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return (winbuf == winbufend
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? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT);
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for (i = 0; i < n; ranges += 3, ++i)
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if (ranges[0] <= wc && wc <= ranges[1]
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&& (wc - ranges[0]) % ranges[2] == 0)
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{
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/* Matches the range. Ignore it. */
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*inbufp += 4;
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++*irreversible;
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return __GCONV_OK;
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}
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else if (wc < ranges[0])
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/* There cannot be any other matching range since they are
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sorted. */
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break;
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}
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/* One last chance: use the default replacement. */
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if (_NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_TRANSLIT_DEFAULT_MISSING_LEN) != 0)
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{
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const uint32_t *default_missing = (const uint32_t *)
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_NL_CURRENT (LC_CTYPE, _NL_CTYPE_TRANSLIT_DEFAULT_MISSING);
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const unsigned char *toinptr = (const unsigned char *) default_missing;
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uint32_t len = _NL_CURRENT_WORD (LC_CTYPE,
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_NL_CTYPE_TRANSLIT_DEFAULT_MISSING_LEN);
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unsigned char *outptr;
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int res;
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/* Test whether there is enough input. */
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if (winbuf + 1 > winbufend)
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return (winbuf == winbufend
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? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT);
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outptr = *outbufstart;
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res = DL_CALL_FCT (fct,
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(step, step_data, &toinptr,
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(const unsigned char *) (default_missing + len),
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&outptr, NULL, 0, 0));
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if (res != __GCONV_ILLEGAL_INPUT)
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{
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/* If the conversion succeeds we have to increment the
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input buffer. */
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if (res == __GCONV_EMPTY_INPUT)
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{
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/* This worked but is not reversible. */
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++*irreversible;
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*inbufp += 4;
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res = __GCONV_OK;
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}
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*outbufstart = outptr;
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return res;
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}
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}
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/* Haven't found a match. */
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return __GCONV_ILLEGAL_INPUT;
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}
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/* Structure to represent results of found (or not) transliteration
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modules. */
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struct known_trans
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{
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/* This structure must remain the first member. */
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struct trans_struct info;
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char *fname;
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void *handle;
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int open_count;
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};
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/* Tree with results of previous calls to __gconv_translit_find. */
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static void *search_tree;
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/* We modify global data. */
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__libc_lock_define_initialized (static, lock);
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/* Compare two transliteration entries. */
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static int
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trans_compare (const void *p1, const void *p2)
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{
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const struct known_trans *s1 = (const struct known_trans *) p1;
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const struct known_trans *s2 = (const struct known_trans *) p2;
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return strcmp (s1->info.name, s2->info.name);
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}
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/* Open (maybe reopen) the module named in the struct. Get the function
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and data structure pointers we need. */
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static int
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open_translit (struct known_trans *trans)
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{
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__gconv_trans_query_fct queryfct;
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trans->handle = __libc_dlopen (trans->fname);
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if (trans->handle == NULL)
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/* Not available. */
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return 1;
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/* Find the required symbol. */
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queryfct = __libc_dlsym (trans->handle, "gconv_trans_context");
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if (queryfct == NULL)
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{
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/* We cannot live with that. */
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close_and_out:
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__libc_dlclose (trans->handle);
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trans->handle = NULL;
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return 1;
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}
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/* Get the context. */
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if (queryfct (trans->info.name, &trans->info.csnames, &trans->info.ncsnames)
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!= 0)
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goto close_and_out;
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/* Of course we also have to have the actual function. */
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trans->info.trans_fct = __libc_dlsym (trans->handle, "gconv_trans");
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if (trans->info.trans_fct == NULL)
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goto close_and_out;
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/* Now the optional functions. */
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trans->info.trans_init_fct =
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__libc_dlsym (trans->handle, "gconv_trans_init");
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trans->info.trans_context_fct =
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__libc_dlsym (trans->handle, "gconv_trans_context");
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trans->info.trans_end_fct =
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__libc_dlsym (trans->handle, "gconv_trans_end");
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trans->open_count = 1;
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return 0;
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}
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int
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internal_function
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__gconv_translit_find (struct trans_struct *trans)
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{
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struct known_trans **found;
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const struct path_elem *runp;
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int res = 1;
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/* We have to have a name. */
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assert (trans->name != NULL);
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/* Acquire the lock. */
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__libc_lock_lock (lock);
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/* See whether we know this module already. */
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found = __tfind (trans, &search_tree, trans_compare);
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if (found != NULL)
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{
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/* Is this module available? */
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if ((*found)->handle != NULL)
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{
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/* Maybe we have to reopen the file. */
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if ((*found)->handle != (void *) -1)
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/* The object is not unloaded. */
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res = 0;
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else if (open_translit (*found) == 0)
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{
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/* Copy the data. */
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*trans = (*found)->info;
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(*found)->open_count++;
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res = 0;
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}
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}
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}
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else
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{
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size_t name_len = strlen (trans->name) + 1;
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int need_so = 0;
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struct known_trans *newp;
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/* We have to continue looking for the module. */
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if (__gconv_path_elem == NULL)
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__gconv_get_path ();
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/* See whether we have to append .so. */
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if (name_len <= 4 || memcmp (&trans->name[name_len - 4], ".so", 3) != 0)
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need_so = 1;
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/* Create a new entry. */
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newp = (struct known_trans *) malloc (sizeof (struct known_trans)
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+ (__gconv_max_path_elem_len
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+ name_len + 3)
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+ name_len);
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if (newp != NULL)
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{
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char *cp;
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/* Clear the struct. */
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memset (newp, '\0', sizeof (struct known_trans));
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/* Store a copy of the module name. */
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newp->info.name = cp = (char *) (newp + 1);
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cp = __mempcpy (cp, trans->name, name_len);
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newp->fname = cp;
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/* Search in all the directories. */
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for (runp = __gconv_path_elem; runp->name != NULL; ++runp)
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{
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cp = __mempcpy (__stpcpy ((char *) newp->fname, runp->name),
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trans->name, name_len);
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if (need_so)
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memcpy (cp, ".so", sizeof (".so"));
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if (open_translit (newp) == 0)
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{
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/* We found a module. */
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res = 0;
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break;
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}
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}
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if (res)
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newp->fname = NULL;
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/* In any case we'll add the entry to our search tree. */
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if (__tsearch (newp, &search_tree, trans_compare) == NULL)
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{
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/* Yickes, this should not happen. Unload the object. */
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res = 1;
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/* XXX unload here. */
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}
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}
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}
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__libc_lock_unlock (lock);
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return res;
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}
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