239 lines
6.9 KiB
C
239 lines
6.9 KiB
C
/* Transliteration using the locale's data.
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Copyright (C) 2000-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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, see
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<https://www.gnu.org/licenses/>. */
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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 <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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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 indices to the string table
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in FROM_TBL. The indices 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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libc_hidden_def (__gconv_transliterate)
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