1712 lines
48 KiB
C
1712 lines
48 KiB
C
/* Extended regular expression matching and search library.
|
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Copyright (C) 2002-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
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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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static void re_string_construct_common (const char *str, Idx len,
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re_string_t *pstr,
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RE_TRANSLATE_TYPE trans, bool icase,
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const re_dfa_t *dfa);
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static re_dfastate_t *create_ci_newstate (const re_dfa_t *dfa,
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const re_node_set *nodes,
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re_hashval_t hash);
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static re_dfastate_t *create_cd_newstate (const re_dfa_t *dfa,
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const re_node_set *nodes,
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unsigned int context,
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re_hashval_t hash);
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static reg_errcode_t re_string_realloc_buffers (re_string_t *pstr,
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Idx new_buf_len);
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static void build_wcs_buffer (re_string_t *pstr);
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static reg_errcode_t build_wcs_upper_buffer (re_string_t *pstr);
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static void build_upper_buffer (re_string_t *pstr);
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static void re_string_translate_buffer (re_string_t *pstr);
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static unsigned int re_string_context_at (const re_string_t *input, Idx idx,
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int eflags) __attribute__ ((pure));
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/* Functions for string operation. */
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/* This function allocate the buffers. It is necessary to call
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re_string_reconstruct before using the object. */
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static reg_errcode_t
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__attribute_warn_unused_result__
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re_string_allocate (re_string_t *pstr, const char *str, Idx len, Idx init_len,
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RE_TRANSLATE_TYPE trans, bool icase, const re_dfa_t *dfa)
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{
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reg_errcode_t ret;
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Idx init_buf_len;
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/* Ensure at least one character fits into the buffers. */
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if (init_len < dfa->mb_cur_max)
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init_len = dfa->mb_cur_max;
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init_buf_len = (len + 1 < init_len) ? len + 1: init_len;
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re_string_construct_common (str, len, pstr, trans, icase, dfa);
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ret = re_string_realloc_buffers (pstr, init_buf_len);
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if (__glibc_unlikely (ret != REG_NOERROR))
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return ret;
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pstr->word_char = dfa->word_char;
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pstr->word_ops_used = dfa->word_ops_used;
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pstr->mbs = pstr->mbs_allocated ? pstr->mbs : (unsigned char *) str;
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pstr->valid_len = (pstr->mbs_allocated || dfa->mb_cur_max > 1) ? 0 : len;
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pstr->valid_raw_len = pstr->valid_len;
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return REG_NOERROR;
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}
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/* This function allocate the buffers, and initialize them. */
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static reg_errcode_t
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__attribute_warn_unused_result__
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re_string_construct (re_string_t *pstr, const char *str, Idx len,
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RE_TRANSLATE_TYPE trans, bool icase, const re_dfa_t *dfa)
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{
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reg_errcode_t ret;
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memset (pstr, '\0', sizeof (re_string_t));
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re_string_construct_common (str, len, pstr, trans, icase, dfa);
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if (len > 0)
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{
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ret = re_string_realloc_buffers (pstr, len + 1);
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if (__glibc_unlikely (ret != REG_NOERROR))
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return ret;
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}
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pstr->mbs = pstr->mbs_allocated ? pstr->mbs : (unsigned char *) str;
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if (icase)
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{
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if (dfa->mb_cur_max > 1)
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{
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while (1)
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{
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ret = build_wcs_upper_buffer (pstr);
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if (__glibc_unlikely (ret != REG_NOERROR))
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return ret;
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if (pstr->valid_raw_len >= len)
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break;
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if (pstr->bufs_len > pstr->valid_len + dfa->mb_cur_max)
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break;
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ret = re_string_realloc_buffers (pstr, pstr->bufs_len * 2);
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if (__glibc_unlikely (ret != REG_NOERROR))
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return ret;
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}
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}
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else
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build_upper_buffer (pstr);
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}
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else
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{
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if (dfa->mb_cur_max > 1)
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build_wcs_buffer (pstr);
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else
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{
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if (trans != NULL)
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re_string_translate_buffer (pstr);
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else
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{
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pstr->valid_len = pstr->bufs_len;
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pstr->valid_raw_len = pstr->bufs_len;
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}
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}
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}
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return REG_NOERROR;
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}
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/* Helper functions for re_string_allocate, and re_string_construct. */
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static reg_errcode_t
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__attribute_warn_unused_result__
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re_string_realloc_buffers (re_string_t *pstr, Idx new_buf_len)
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{
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if (pstr->mb_cur_max > 1)
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{
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wint_t *new_wcs;
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/* Avoid overflow in realloc. */
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const size_t max_object_size = MAX (sizeof (wint_t), sizeof (Idx));
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if (__glibc_unlikely (MIN (IDX_MAX, SIZE_MAX / max_object_size)
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< new_buf_len))
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return REG_ESPACE;
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new_wcs = re_realloc (pstr->wcs, wint_t, new_buf_len);
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if (__glibc_unlikely (new_wcs == NULL))
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return REG_ESPACE;
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pstr->wcs = new_wcs;
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if (pstr->offsets != NULL)
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{
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Idx *new_offsets = re_realloc (pstr->offsets, Idx, new_buf_len);
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if (__glibc_unlikely (new_offsets == NULL))
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return REG_ESPACE;
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pstr->offsets = new_offsets;
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}
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}
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if (pstr->mbs_allocated)
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{
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unsigned char *new_mbs = re_realloc (pstr->mbs, unsigned char,
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new_buf_len);
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if (__glibc_unlikely (new_mbs == NULL))
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return REG_ESPACE;
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pstr->mbs = new_mbs;
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}
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pstr->bufs_len = new_buf_len;
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return REG_NOERROR;
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}
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static void
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re_string_construct_common (const char *str, Idx len, re_string_t *pstr,
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RE_TRANSLATE_TYPE trans, bool icase,
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const re_dfa_t *dfa)
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{
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pstr->raw_mbs = (const unsigned char *) str;
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pstr->len = len;
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pstr->raw_len = len;
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pstr->trans = trans;
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pstr->icase = icase;
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pstr->mbs_allocated = (trans != NULL || icase);
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pstr->mb_cur_max = dfa->mb_cur_max;
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pstr->is_utf8 = dfa->is_utf8;
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pstr->map_notascii = dfa->map_notascii;
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pstr->stop = pstr->len;
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pstr->raw_stop = pstr->stop;
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}
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/* Build wide character buffer PSTR->WCS.
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If the byte sequence of the string are:
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<mb1>(0), <mb1>(1), <mb2>(0), <mb2>(1), <sb3>
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Then wide character buffer will be:
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<wc1> , WEOF , <wc2> , WEOF , <wc3>
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We use WEOF for padding, they indicate that the position isn't
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a first byte of a multibyte character.
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Note that this function assumes PSTR->VALID_LEN elements are already
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built and starts from PSTR->VALID_LEN. */
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static void
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build_wcs_buffer (re_string_t *pstr)
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{
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#ifdef _LIBC
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unsigned char buf[MB_LEN_MAX];
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DEBUG_ASSERT (MB_LEN_MAX >= pstr->mb_cur_max);
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#else
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unsigned char buf[64];
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#endif
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mbstate_t prev_st;
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Idx byte_idx, end_idx, remain_len;
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size_t mbclen;
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/* Build the buffers from pstr->valid_len to either pstr->len or
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pstr->bufs_len. */
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end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
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for (byte_idx = pstr->valid_len; byte_idx < end_idx;)
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{
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wchar_t wc;
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const char *p;
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remain_len = end_idx - byte_idx;
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prev_st = pstr->cur_state;
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/* Apply the translation if we need. */
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if (__glibc_unlikely (pstr->trans != NULL))
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{
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int i, ch;
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for (i = 0; i < pstr->mb_cur_max && i < remain_len; ++i)
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{
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ch = pstr->raw_mbs [pstr->raw_mbs_idx + byte_idx + i];
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buf[i] = pstr->mbs[byte_idx + i] = pstr->trans[ch];
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}
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p = (const char *) buf;
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}
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else
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p = (const char *) pstr->raw_mbs + pstr->raw_mbs_idx + byte_idx;
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mbclen = __mbrtowc (&wc, p, remain_len, &pstr->cur_state);
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if (__glibc_unlikely (mbclen == (size_t) -1 || mbclen == 0
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|| (mbclen == (size_t) -2
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&& pstr->bufs_len >= pstr->len)))
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{
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/* We treat these cases as a singlebyte character. */
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mbclen = 1;
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wc = (wchar_t) pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx];
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if (__glibc_unlikely (pstr->trans != NULL))
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wc = pstr->trans[wc];
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pstr->cur_state = prev_st;
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}
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else if (__glibc_unlikely (mbclen == (size_t) -2))
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{
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/* The buffer doesn't have enough space, finish to build. */
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pstr->cur_state = prev_st;
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break;
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}
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/* Write wide character and padding. */
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pstr->wcs[byte_idx++] = wc;
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/* Write paddings. */
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for (remain_len = byte_idx + mbclen - 1; byte_idx < remain_len ;)
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pstr->wcs[byte_idx++] = WEOF;
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}
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pstr->valid_len = byte_idx;
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pstr->valid_raw_len = byte_idx;
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}
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/* Build wide character buffer PSTR->WCS like build_wcs_buffer,
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but for REG_ICASE. */
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static reg_errcode_t
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__attribute_warn_unused_result__
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build_wcs_upper_buffer (re_string_t *pstr)
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{
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||
mbstate_t prev_st;
|
||
Idx src_idx, byte_idx, end_idx, remain_len;
|
||
size_t mbclen;
|
||
#ifdef _LIBC
|
||
char buf[MB_LEN_MAX];
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||
DEBUG_ASSERT (pstr->mb_cur_max <= MB_LEN_MAX);
|
||
#else
|
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char buf[64];
|
||
#endif
|
||
|
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byte_idx = pstr->valid_len;
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||
end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
|
||
|
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/* The following optimization assumes that ASCII characters can be
|
||
mapped to wide characters with a simple cast. */
|
||
if (! pstr->map_notascii && pstr->trans == NULL && !pstr->offsets_needed)
|
||
{
|
||
while (byte_idx < end_idx)
|
||
{
|
||
wchar_t wc;
|
||
unsigned char ch = pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx];
|
||
|
||
if (isascii (ch) && mbsinit (&pstr->cur_state))
|
||
{
|
||
/* The next step uses the assumption that wchar_t is encoded
|
||
ASCII-safe: all ASCII values can be converted like this. */
|
||
wchar_t wcu = __towupper (ch);
|
||
if (isascii (wcu))
|
||
{
|
||
pstr->mbs[byte_idx] = wcu;
|
||
pstr->wcs[byte_idx] = wcu;
|
||
byte_idx++;
|
||
continue;
|
||
}
|
||
}
|
||
|
||
remain_len = end_idx - byte_idx;
|
||
prev_st = pstr->cur_state;
|
||
mbclen = __mbrtowc (&wc,
|
||
((const char *) pstr->raw_mbs + pstr->raw_mbs_idx
|
||
+ byte_idx), remain_len, &pstr->cur_state);
|
||
if (__glibc_likely (0 < mbclen && mbclen < (size_t) -2))
|
||
{
|
||
wchar_t wcu = __towupper (wc);
|
||
if (wcu != wc)
|
||
{
|
||
size_t mbcdlen;
|
||
|
||
mbcdlen = __wcrtomb (buf, wcu, &prev_st);
|
||
if (__glibc_likely (mbclen == mbcdlen))
|
||
memcpy (pstr->mbs + byte_idx, buf, mbclen);
|
||
else
|
||
{
|
||
src_idx = byte_idx;
|
||
goto offsets_needed;
|
||
}
|
||
}
|
||
else
|
||
memcpy (pstr->mbs + byte_idx,
|
||
pstr->raw_mbs + pstr->raw_mbs_idx + byte_idx, mbclen);
|
||
pstr->wcs[byte_idx++] = wcu;
|
||
/* Write paddings. */
|
||
for (remain_len = byte_idx + mbclen - 1; byte_idx < remain_len ;)
|
||
pstr->wcs[byte_idx++] = WEOF;
|
||
}
|
||
else if (mbclen == (size_t) -1 || mbclen == 0
|
||
|| (mbclen == (size_t) -2 && pstr->bufs_len >= pstr->len))
|
||
{
|
||
/* It is an invalid character, an incomplete character
|
||
at the end of the string, or '\0'. Just use the byte. */
|
||
pstr->mbs[byte_idx] = ch;
|
||
/* And also cast it to wide char. */
|
||
pstr->wcs[byte_idx++] = (wchar_t) ch;
|
||
if (__glibc_unlikely (mbclen == (size_t) -1))
|
||
pstr->cur_state = prev_st;
|
||
}
|
||
else
|
||
{
|
||
/* The buffer doesn't have enough space, finish to build. */
|
||
pstr->cur_state = prev_st;
|
||
break;
|
||
}
|
||
}
|
||
pstr->valid_len = byte_idx;
|
||
pstr->valid_raw_len = byte_idx;
|
||
return REG_NOERROR;
|
||
}
|
||
else
|
||
for (src_idx = pstr->valid_raw_len; byte_idx < end_idx;)
|
||
{
|
||
wchar_t wc;
|
||
const char *p;
|
||
offsets_needed:
|
||
remain_len = end_idx - byte_idx;
|
||
prev_st = pstr->cur_state;
|
||
if (__glibc_unlikely (pstr->trans != NULL))
|
||
{
|
||
int i, ch;
|
||
|
||
for (i = 0; i < pstr->mb_cur_max && i < remain_len; ++i)
|
||
{
|
||
ch = pstr->raw_mbs [pstr->raw_mbs_idx + src_idx + i];
|
||
buf[i] = pstr->trans[ch];
|
||
}
|
||
p = (const char *) buf;
|
||
}
|
||
else
|
||
p = (const char *) pstr->raw_mbs + pstr->raw_mbs_idx + src_idx;
|
||
mbclen = __mbrtowc (&wc, p, remain_len, &pstr->cur_state);
|
||
if (__glibc_likely (0 < mbclen && mbclen < (size_t) -2))
|
||
{
|
||
wchar_t wcu = __towupper (wc);
|
||
if (wcu != wc)
|
||
{
|
||
size_t mbcdlen;
|
||
|
||
mbcdlen = __wcrtomb ((char *) buf, wcu, &prev_st);
|
||
if (__glibc_likely (mbclen == mbcdlen))
|
||
memcpy (pstr->mbs + byte_idx, buf, mbclen);
|
||
else if (mbcdlen != (size_t) -1)
|
||
{
|
||
size_t i;
|
||
|
||
if (byte_idx + mbcdlen > pstr->bufs_len)
|
||
{
|
||
pstr->cur_state = prev_st;
|
||
break;
|
||
}
|
||
|
||
if (pstr->offsets == NULL)
|
||
{
|
||
pstr->offsets = re_malloc (Idx, pstr->bufs_len);
|
||
|
||
if (pstr->offsets == NULL)
|
||
return REG_ESPACE;
|
||
}
|
||
if (!pstr->offsets_needed)
|
||
{
|
||
for (i = 0; i < (size_t) byte_idx; ++i)
|
||
pstr->offsets[i] = i;
|
||
pstr->offsets_needed = 1;
|
||
}
|
||
|
||
memcpy (pstr->mbs + byte_idx, buf, mbcdlen);
|
||
pstr->wcs[byte_idx] = wcu;
|
||
pstr->offsets[byte_idx] = src_idx;
|
||
for (i = 1; i < mbcdlen; ++i)
|
||
{
|
||
pstr->offsets[byte_idx + i]
|
||
= src_idx + (i < mbclen ? i : mbclen - 1);
|
||
pstr->wcs[byte_idx + i] = WEOF;
|
||
}
|
||
pstr->len += mbcdlen - mbclen;
|
||
if (pstr->raw_stop > src_idx)
|
||
pstr->stop += mbcdlen - mbclen;
|
||
end_idx = (pstr->bufs_len > pstr->len)
|
||
? pstr->len : pstr->bufs_len;
|
||
byte_idx += mbcdlen;
|
||
src_idx += mbclen;
|
||
continue;
|
||
}
|
||
else
|
||
memcpy (pstr->mbs + byte_idx, p, mbclen);
|
||
}
|
||
else
|
||
memcpy (pstr->mbs + byte_idx, p, mbclen);
|
||
|
||
if (__glibc_unlikely (pstr->offsets_needed != 0))
|
||
{
|
||
size_t i;
|
||
for (i = 0; i < mbclen; ++i)
|
||
pstr->offsets[byte_idx + i] = src_idx + i;
|
||
}
|
||
src_idx += mbclen;
|
||
|
||
pstr->wcs[byte_idx++] = wcu;
|
||
/* Write paddings. */
|
||
for (remain_len = byte_idx + mbclen - 1; byte_idx < remain_len ;)
|
||
pstr->wcs[byte_idx++] = WEOF;
|
||
}
|
||
else if (mbclen == (size_t) -1 || mbclen == 0
|
||
|| (mbclen == (size_t) -2 && pstr->bufs_len >= pstr->len))
|
||
{
|
||
/* It is an invalid character or '\0'. Just use the byte. */
|
||
int ch = pstr->raw_mbs[pstr->raw_mbs_idx + src_idx];
|
||
|
||
if (__glibc_unlikely (pstr->trans != NULL))
|
||
ch = pstr->trans [ch];
|
||
pstr->mbs[byte_idx] = ch;
|
||
|
||
if (__glibc_unlikely (pstr->offsets_needed != 0))
|
||
pstr->offsets[byte_idx] = src_idx;
|
||
++src_idx;
|
||
|
||
/* And also cast it to wide char. */
|
||
pstr->wcs[byte_idx++] = (wchar_t) ch;
|
||
if (__glibc_unlikely (mbclen == (size_t) -1))
|
||
pstr->cur_state = prev_st;
|
||
}
|
||
else
|
||
{
|
||
/* The buffer doesn't have enough space, finish to build. */
|
||
pstr->cur_state = prev_st;
|
||
break;
|
||
}
|
||
}
|
||
pstr->valid_len = byte_idx;
|
||
pstr->valid_raw_len = src_idx;
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
/* Skip characters until the index becomes greater than NEW_RAW_IDX.
|
||
Return the index. */
|
||
|
||
static Idx
|
||
re_string_skip_chars (re_string_t *pstr, Idx new_raw_idx, wint_t *last_wc)
|
||
{
|
||
mbstate_t prev_st;
|
||
Idx rawbuf_idx;
|
||
size_t mbclen;
|
||
wint_t wc = WEOF;
|
||
|
||
/* Skip the characters which are not necessary to check. */
|
||
for (rawbuf_idx = pstr->raw_mbs_idx + pstr->valid_raw_len;
|
||
rawbuf_idx < new_raw_idx;)
|
||
{
|
||
wchar_t wc2;
|
||
Idx remain_len = pstr->raw_len - rawbuf_idx;
|
||
prev_st = pstr->cur_state;
|
||
mbclen = __mbrtowc (&wc2, (const char *) pstr->raw_mbs + rawbuf_idx,
|
||
remain_len, &pstr->cur_state);
|
||
if (__glibc_unlikely (mbclen == (size_t) -2 || mbclen == (size_t) -1
|
||
|| mbclen == 0))
|
||
{
|
||
/* We treat these cases as a single byte character. */
|
||
if (mbclen == 0 || remain_len == 0)
|
||
wc = L'\0';
|
||
else
|
||
wc = *(unsigned char *) (pstr->raw_mbs + rawbuf_idx);
|
||
mbclen = 1;
|
||
pstr->cur_state = prev_st;
|
||
}
|
||
else
|
||
wc = wc2;
|
||
/* Then proceed the next character. */
|
||
rawbuf_idx += mbclen;
|
||
}
|
||
*last_wc = wc;
|
||
return rawbuf_idx;
|
||
}
|
||
|
||
/* Build the buffer PSTR->MBS, and apply the translation if we need.
|
||
This function is used in case of REG_ICASE. */
|
||
|
||
static void
|
||
build_upper_buffer (re_string_t *pstr)
|
||
{
|
||
Idx char_idx, end_idx;
|
||
end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
|
||
|
||
for (char_idx = pstr->valid_len; char_idx < end_idx; ++char_idx)
|
||
{
|
||
int ch = pstr->raw_mbs[pstr->raw_mbs_idx + char_idx];
|
||
if (__glibc_unlikely (pstr->trans != NULL))
|
||
ch = pstr->trans[ch];
|
||
pstr->mbs[char_idx] = toupper (ch);
|
||
}
|
||
pstr->valid_len = char_idx;
|
||
pstr->valid_raw_len = char_idx;
|
||
}
|
||
|
||
/* Apply TRANS to the buffer in PSTR. */
|
||
|
||
static void
|
||
re_string_translate_buffer (re_string_t *pstr)
|
||
{
|
||
Idx buf_idx, end_idx;
|
||
end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
|
||
|
||
for (buf_idx = pstr->valid_len; buf_idx < end_idx; ++buf_idx)
|
||
{
|
||
int ch = pstr->raw_mbs[pstr->raw_mbs_idx + buf_idx];
|
||
pstr->mbs[buf_idx] = pstr->trans[ch];
|
||
}
|
||
|
||
pstr->valid_len = buf_idx;
|
||
pstr->valid_raw_len = buf_idx;
|
||
}
|
||
|
||
/* This function re-construct the buffers.
|
||
Concretely, convert to wide character in case of pstr->mb_cur_max > 1,
|
||
convert to upper case in case of REG_ICASE, apply translation. */
|
||
|
||
static reg_errcode_t
|
||
__attribute_warn_unused_result__
|
||
re_string_reconstruct (re_string_t *pstr, Idx idx, int eflags)
|
||
{
|
||
Idx offset;
|
||
|
||
if (__glibc_unlikely (pstr->raw_mbs_idx <= idx))
|
||
offset = idx - pstr->raw_mbs_idx;
|
||
else
|
||
{
|
||
/* Reset buffer. */
|
||
if (pstr->mb_cur_max > 1)
|
||
memset (&pstr->cur_state, '\0', sizeof (mbstate_t));
|
||
pstr->len = pstr->raw_len;
|
||
pstr->stop = pstr->raw_stop;
|
||
pstr->valid_len = 0;
|
||
pstr->raw_mbs_idx = 0;
|
||
pstr->valid_raw_len = 0;
|
||
pstr->offsets_needed = 0;
|
||
pstr->tip_context = ((eflags & REG_NOTBOL) ? CONTEXT_BEGBUF
|
||
: CONTEXT_NEWLINE | CONTEXT_BEGBUF);
|
||
if (!pstr->mbs_allocated)
|
||
pstr->mbs = (unsigned char *) pstr->raw_mbs;
|
||
offset = idx;
|
||
}
|
||
|
||
if (__glibc_likely (offset != 0))
|
||
{
|
||
/* Should the already checked characters be kept? */
|
||
if (__glibc_likely (offset < pstr->valid_raw_len))
|
||
{
|
||
/* Yes, move them to the front of the buffer. */
|
||
if (__glibc_unlikely (pstr->offsets_needed))
|
||
{
|
||
Idx low = 0, high = pstr->valid_len, mid;
|
||
do
|
||
{
|
||
mid = (high + low) / 2;
|
||
if (pstr->offsets[mid] > offset)
|
||
high = mid;
|
||
else if (pstr->offsets[mid] < offset)
|
||
low = mid + 1;
|
||
else
|
||
break;
|
||
}
|
||
while (low < high);
|
||
if (pstr->offsets[mid] < offset)
|
||
++mid;
|
||
pstr->tip_context = re_string_context_at (pstr, mid - 1,
|
||
eflags);
|
||
/* This can be quite complicated, so handle specially
|
||
only the common and easy case where the character with
|
||
different length representation of lower and upper
|
||
case is present at or after offset. */
|
||
if (pstr->valid_len > offset
|
||
&& mid == offset && pstr->offsets[mid] == offset)
|
||
{
|
||
memmove (pstr->wcs, pstr->wcs + offset,
|
||
(pstr->valid_len - offset) * sizeof (wint_t));
|
||
memmove (pstr->mbs, pstr->mbs + offset, pstr->valid_len - offset);
|
||
pstr->valid_len -= offset;
|
||
pstr->valid_raw_len -= offset;
|
||
for (low = 0; low < pstr->valid_len; low++)
|
||
pstr->offsets[low] = pstr->offsets[low + offset] - offset;
|
||
}
|
||
else
|
||
{
|
||
/* Otherwise, just find out how long the partial multibyte
|
||
character at offset is and fill it with WEOF/255. */
|
||
pstr->len = pstr->raw_len - idx + offset;
|
||
pstr->stop = pstr->raw_stop - idx + offset;
|
||
pstr->offsets_needed = 0;
|
||
while (mid > 0 && pstr->offsets[mid - 1] == offset)
|
||
--mid;
|
||
while (mid < pstr->valid_len)
|
||
if (pstr->wcs[mid] != WEOF)
|
||
break;
|
||
else
|
||
++mid;
|
||
if (mid == pstr->valid_len)
|
||
pstr->valid_len = 0;
|
||
else
|
||
{
|
||
pstr->valid_len = pstr->offsets[mid] - offset;
|
||
if (pstr->valid_len)
|
||
{
|
||
for (low = 0; low < pstr->valid_len; ++low)
|
||
pstr->wcs[low] = WEOF;
|
||
memset (pstr->mbs, 255, pstr->valid_len);
|
||
}
|
||
}
|
||
pstr->valid_raw_len = pstr->valid_len;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
pstr->tip_context = re_string_context_at (pstr, offset - 1,
|
||
eflags);
|
||
if (pstr->mb_cur_max > 1)
|
||
memmove (pstr->wcs, pstr->wcs + offset,
|
||
(pstr->valid_len - offset) * sizeof (wint_t));
|
||
if (__glibc_unlikely (pstr->mbs_allocated))
|
||
memmove (pstr->mbs, pstr->mbs + offset,
|
||
pstr->valid_len - offset);
|
||
pstr->valid_len -= offset;
|
||
pstr->valid_raw_len -= offset;
|
||
DEBUG_ASSERT (pstr->valid_len > 0);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* No, skip all characters until IDX. */
|
||
Idx prev_valid_len = pstr->valid_len;
|
||
|
||
if (__glibc_unlikely (pstr->offsets_needed))
|
||
{
|
||
pstr->len = pstr->raw_len - idx + offset;
|
||
pstr->stop = pstr->raw_stop - idx + offset;
|
||
pstr->offsets_needed = 0;
|
||
}
|
||
pstr->valid_len = 0;
|
||
if (pstr->mb_cur_max > 1)
|
||
{
|
||
Idx wcs_idx;
|
||
wint_t wc = WEOF;
|
||
|
||
if (pstr->is_utf8)
|
||
{
|
||
const unsigned char *raw, *p, *end;
|
||
|
||
/* Special case UTF-8. Multi-byte chars start with any
|
||
byte other than 0x80 - 0xbf. */
|
||
raw = pstr->raw_mbs + pstr->raw_mbs_idx;
|
||
end = raw + (offset - pstr->mb_cur_max);
|
||
if (end < pstr->raw_mbs)
|
||
end = pstr->raw_mbs;
|
||
p = raw + offset - 1;
|
||
#ifdef _LIBC
|
||
/* We know the wchar_t encoding is UCS4, so for the simple
|
||
case, ASCII characters, skip the conversion step. */
|
||
if (isascii (*p) && __glibc_likely (pstr->trans == NULL))
|
||
{
|
||
memset (&pstr->cur_state, '\0', sizeof (mbstate_t));
|
||
/* pstr->valid_len = 0; */
|
||
wc = (wchar_t) *p;
|
||
}
|
||
else
|
||
#endif
|
||
for (; p >= end; --p)
|
||
if ((*p & 0xc0) != 0x80)
|
||
{
|
||
mbstate_t cur_state;
|
||
wchar_t wc2;
|
||
Idx mlen = raw + pstr->len - p;
|
||
unsigned char buf[6];
|
||
size_t mbclen;
|
||
|
||
const unsigned char *pp = p;
|
||
if (__glibc_unlikely (pstr->trans != NULL))
|
||
{
|
||
int i = mlen < 6 ? mlen : 6;
|
||
while (--i >= 0)
|
||
buf[i] = pstr->trans[p[i]];
|
||
pp = buf;
|
||
}
|
||
/* XXX Don't use mbrtowc, we know which conversion
|
||
to use (UTF-8 -> UCS4). */
|
||
memset (&cur_state, 0, sizeof (cur_state));
|
||
mbclen = __mbrtowc (&wc2, (const char *) pp, mlen,
|
||
&cur_state);
|
||
if (raw + offset - p <= mbclen
|
||
&& mbclen < (size_t) -2)
|
||
{
|
||
memset (&pstr->cur_state, '\0',
|
||
sizeof (mbstate_t));
|
||
pstr->valid_len = mbclen - (raw + offset - p);
|
||
wc = wc2;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (wc == WEOF)
|
||
pstr->valid_len = re_string_skip_chars (pstr, idx, &wc) - idx;
|
||
if (wc == WEOF)
|
||
pstr->tip_context
|
||
= re_string_context_at (pstr, prev_valid_len - 1, eflags);
|
||
else
|
||
pstr->tip_context = ((__glibc_unlikely (pstr->word_ops_used != 0)
|
||
&& IS_WIDE_WORD_CHAR (wc))
|
||
? CONTEXT_WORD
|
||
: ((IS_WIDE_NEWLINE (wc)
|
||
&& pstr->newline_anchor)
|
||
? CONTEXT_NEWLINE : 0));
|
||
if (__glibc_unlikely (pstr->valid_len))
|
||
{
|
||
for (wcs_idx = 0; wcs_idx < pstr->valid_len; ++wcs_idx)
|
||
pstr->wcs[wcs_idx] = WEOF;
|
||
if (pstr->mbs_allocated)
|
||
memset (pstr->mbs, 255, pstr->valid_len);
|
||
}
|
||
pstr->valid_raw_len = pstr->valid_len;
|
||
}
|
||
else
|
||
{
|
||
int c = pstr->raw_mbs[pstr->raw_mbs_idx + offset - 1];
|
||
pstr->valid_raw_len = 0;
|
||
if (pstr->trans)
|
||
c = pstr->trans[c];
|
||
pstr->tip_context = (bitset_contain (pstr->word_char, c)
|
||
? CONTEXT_WORD
|
||
: ((IS_NEWLINE (c) && pstr->newline_anchor)
|
||
? CONTEXT_NEWLINE : 0));
|
||
}
|
||
}
|
||
if (!__glibc_unlikely (pstr->mbs_allocated))
|
||
pstr->mbs += offset;
|
||
}
|
||
pstr->raw_mbs_idx = idx;
|
||
pstr->len -= offset;
|
||
pstr->stop -= offset;
|
||
|
||
/* Then build the buffers. */
|
||
if (pstr->mb_cur_max > 1)
|
||
{
|
||
if (pstr->icase)
|
||
{
|
||
reg_errcode_t ret = build_wcs_upper_buffer (pstr);
|
||
if (__glibc_unlikely (ret != REG_NOERROR))
|
||
return ret;
|
||
}
|
||
else
|
||
build_wcs_buffer (pstr);
|
||
}
|
||
else
|
||
if (__glibc_unlikely (pstr->mbs_allocated))
|
||
{
|
||
if (pstr->icase)
|
||
build_upper_buffer (pstr);
|
||
else if (pstr->trans != NULL)
|
||
re_string_translate_buffer (pstr);
|
||
}
|
||
else
|
||
pstr->valid_len = pstr->len;
|
||
|
||
pstr->cur_idx = 0;
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
static unsigned char
|
||
__attribute__ ((pure))
|
||
re_string_peek_byte_case (const re_string_t *pstr, Idx idx)
|
||
{
|
||
int ch;
|
||
Idx off;
|
||
|
||
/* Handle the common (easiest) cases first. */
|
||
if (__glibc_likely (!pstr->mbs_allocated))
|
||
return re_string_peek_byte (pstr, idx);
|
||
|
||
if (pstr->mb_cur_max > 1
|
||
&& ! re_string_is_single_byte_char (pstr, pstr->cur_idx + idx))
|
||
return re_string_peek_byte (pstr, idx);
|
||
|
||
off = pstr->cur_idx + idx;
|
||
if (pstr->offsets_needed)
|
||
off = pstr->offsets[off];
|
||
|
||
ch = pstr->raw_mbs[pstr->raw_mbs_idx + off];
|
||
|
||
/* Ensure that e.g. for tr_TR.UTF-8 BACKSLASH DOTLESS SMALL LETTER I
|
||
this function returns CAPITAL LETTER I instead of first byte of
|
||
DOTLESS SMALL LETTER I. The latter would confuse the parser,
|
||
since peek_byte_case doesn't advance cur_idx in any way. */
|
||
if (pstr->offsets_needed && !isascii (ch))
|
||
return re_string_peek_byte (pstr, idx);
|
||
|
||
return ch;
|
||
}
|
||
|
||
static unsigned char
|
||
re_string_fetch_byte_case (re_string_t *pstr)
|
||
{
|
||
if (__glibc_likely (!pstr->mbs_allocated))
|
||
return re_string_fetch_byte (pstr);
|
||
|
||
if (pstr->offsets_needed)
|
||
{
|
||
Idx off;
|
||
int ch;
|
||
|
||
/* For tr_TR.UTF-8 [[:islower:]] there is
|
||
[[: CAPITAL LETTER I WITH DOT lower:]] in mbs. Skip
|
||
in that case the whole multi-byte character and return
|
||
the original letter. On the other side, with
|
||
[[: DOTLESS SMALL LETTER I return [[:I, as doing
|
||
anything else would complicate things too much. */
|
||
|
||
if (!re_string_first_byte (pstr, pstr->cur_idx))
|
||
return re_string_fetch_byte (pstr);
|
||
|
||
off = pstr->offsets[pstr->cur_idx];
|
||
ch = pstr->raw_mbs[pstr->raw_mbs_idx + off];
|
||
|
||
if (! isascii (ch))
|
||
return re_string_fetch_byte (pstr);
|
||
|
||
re_string_skip_bytes (pstr,
|
||
re_string_char_size_at (pstr, pstr->cur_idx));
|
||
return ch;
|
||
}
|
||
|
||
return pstr->raw_mbs[pstr->raw_mbs_idx + pstr->cur_idx++];
|
||
}
|
||
|
||
static void
|
||
re_string_destruct (re_string_t *pstr)
|
||
{
|
||
re_free (pstr->wcs);
|
||
re_free (pstr->offsets);
|
||
if (pstr->mbs_allocated)
|
||
re_free (pstr->mbs);
|
||
}
|
||
|
||
/* Return the context at IDX in INPUT. */
|
||
|
||
static unsigned int
|
||
re_string_context_at (const re_string_t *input, Idx idx, int eflags)
|
||
{
|
||
int c;
|
||
if (__glibc_unlikely (idx < 0))
|
||
/* In this case, we use the value stored in input->tip_context,
|
||
since we can't know the character in input->mbs[-1] here. */
|
||
return input->tip_context;
|
||
if (__glibc_unlikely (idx == input->len))
|
||
return ((eflags & REG_NOTEOL) ? CONTEXT_ENDBUF
|
||
: CONTEXT_NEWLINE | CONTEXT_ENDBUF);
|
||
if (input->mb_cur_max > 1)
|
||
{
|
||
wint_t wc;
|
||
Idx wc_idx = idx;
|
||
while(input->wcs[wc_idx] == WEOF)
|
||
{
|
||
DEBUG_ASSERT (wc_idx >= 0);
|
||
--wc_idx;
|
||
if (wc_idx < 0)
|
||
return input->tip_context;
|
||
}
|
||
wc = input->wcs[wc_idx];
|
||
if (__glibc_unlikely (input->word_ops_used != 0)
|
||
&& IS_WIDE_WORD_CHAR (wc))
|
||
return CONTEXT_WORD;
|
||
return (IS_WIDE_NEWLINE (wc) && input->newline_anchor
|
||
? CONTEXT_NEWLINE : 0);
|
||
}
|
||
else
|
||
{
|
||
c = re_string_byte_at (input, idx);
|
||
if (bitset_contain (input->word_char, c))
|
||
return CONTEXT_WORD;
|
||
return IS_NEWLINE (c) && input->newline_anchor ? CONTEXT_NEWLINE : 0;
|
||
}
|
||
}
|
||
|
||
/* Functions for set operation. */
|
||
|
||
static reg_errcode_t
|
||
__attribute_warn_unused_result__
|
||
re_node_set_alloc (re_node_set *set, Idx size)
|
||
{
|
||
set->alloc = size;
|
||
set->nelem = 0;
|
||
set->elems = re_malloc (Idx, size);
|
||
if (__glibc_unlikely (set->elems == NULL)
|
||
&& (MALLOC_0_IS_NONNULL || size != 0))
|
||
return REG_ESPACE;
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
static reg_errcode_t
|
||
__attribute_warn_unused_result__
|
||
re_node_set_init_1 (re_node_set *set, Idx elem)
|
||
{
|
||
set->alloc = 1;
|
||
set->nelem = 1;
|
||
set->elems = re_malloc (Idx, 1);
|
||
if (__glibc_unlikely (set->elems == NULL))
|
||
{
|
||
set->alloc = set->nelem = 0;
|
||
return REG_ESPACE;
|
||
}
|
||
set->elems[0] = elem;
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
static reg_errcode_t
|
||
__attribute_warn_unused_result__
|
||
re_node_set_init_2 (re_node_set *set, Idx elem1, Idx elem2)
|
||
{
|
||
set->alloc = 2;
|
||
set->elems = re_malloc (Idx, 2);
|
||
if (__glibc_unlikely (set->elems == NULL))
|
||
return REG_ESPACE;
|
||
if (elem1 == elem2)
|
||
{
|
||
set->nelem = 1;
|
||
set->elems[0] = elem1;
|
||
}
|
||
else
|
||
{
|
||
set->nelem = 2;
|
||
if (elem1 < elem2)
|
||
{
|
||
set->elems[0] = elem1;
|
||
set->elems[1] = elem2;
|
||
}
|
||
else
|
||
{
|
||
set->elems[0] = elem2;
|
||
set->elems[1] = elem1;
|
||
}
|
||
}
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
static reg_errcode_t
|
||
__attribute_warn_unused_result__
|
||
re_node_set_init_copy (re_node_set *dest, const re_node_set *src)
|
||
{
|
||
dest->nelem = src->nelem;
|
||
if (src->nelem > 0)
|
||
{
|
||
dest->alloc = dest->nelem;
|
||
dest->elems = re_malloc (Idx, dest->alloc);
|
||
if (__glibc_unlikely (dest->elems == NULL))
|
||
{
|
||
dest->alloc = dest->nelem = 0;
|
||
return REG_ESPACE;
|
||
}
|
||
memcpy (dest->elems, src->elems, src->nelem * sizeof (Idx));
|
||
}
|
||
else
|
||
re_node_set_init_empty (dest);
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
/* Calculate the intersection of the sets SRC1 and SRC2. And merge it to
|
||
DEST. Return value indicate the error code or REG_NOERROR if succeeded.
|
||
Note: We assume dest->elems is NULL, when dest->alloc is 0. */
|
||
|
||
static reg_errcode_t
|
||
__attribute_warn_unused_result__
|
||
re_node_set_add_intersect (re_node_set *dest, const re_node_set *src1,
|
||
const re_node_set *src2)
|
||
{
|
||
Idx i1, i2, is, id, delta, sbase;
|
||
if (src1->nelem == 0 || src2->nelem == 0)
|
||
return REG_NOERROR;
|
||
|
||
/* We need dest->nelem + 2 * elems_in_intersection; this is a
|
||
conservative estimate. */
|
||
if (src1->nelem + src2->nelem + dest->nelem > dest->alloc)
|
||
{
|
||
Idx new_alloc = src1->nelem + src2->nelem + dest->alloc;
|
||
Idx *new_elems = re_realloc (dest->elems, Idx, new_alloc);
|
||
if (__glibc_unlikely (new_elems == NULL))
|
||
return REG_ESPACE;
|
||
dest->elems = new_elems;
|
||
dest->alloc = new_alloc;
|
||
}
|
||
|
||
/* Find the items in the intersection of SRC1 and SRC2, and copy
|
||
into the top of DEST those that are not already in DEST itself. */
|
||
sbase = dest->nelem + src1->nelem + src2->nelem;
|
||
i1 = src1->nelem - 1;
|
||
i2 = src2->nelem - 1;
|
||
id = dest->nelem - 1;
|
||
for (;;)
|
||
{
|
||
if (src1->elems[i1] == src2->elems[i2])
|
||
{
|
||
/* Try to find the item in DEST. Maybe we could binary search? */
|
||
while (id >= 0 && dest->elems[id] > src1->elems[i1])
|
||
--id;
|
||
|
||
if (id < 0 || dest->elems[id] != src1->elems[i1])
|
||
dest->elems[--sbase] = src1->elems[i1];
|
||
|
||
if (--i1 < 0 || --i2 < 0)
|
||
break;
|
||
}
|
||
|
||
/* Lower the highest of the two items. */
|
||
else if (src1->elems[i1] < src2->elems[i2])
|
||
{
|
||
if (--i2 < 0)
|
||
break;
|
||
}
|
||
else
|
||
{
|
||
if (--i1 < 0)
|
||
break;
|
||
}
|
||
}
|
||
|
||
id = dest->nelem - 1;
|
||
is = dest->nelem + src1->nelem + src2->nelem - 1;
|
||
delta = is - sbase + 1;
|
||
|
||
/* Now copy. When DELTA becomes zero, the remaining
|
||
DEST elements are already in place; this is more or
|
||
less the same loop that is in re_node_set_merge. */
|
||
dest->nelem += delta;
|
||
if (delta > 0 && id >= 0)
|
||
for (;;)
|
||
{
|
||
if (dest->elems[is] > dest->elems[id])
|
||
{
|
||
/* Copy from the top. */
|
||
dest->elems[id + delta--] = dest->elems[is--];
|
||
if (delta == 0)
|
||
break;
|
||
}
|
||
else
|
||
{
|
||
/* Slide from the bottom. */
|
||
dest->elems[id + delta] = dest->elems[id];
|
||
if (--id < 0)
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Copy remaining SRC elements. */
|
||
memcpy (dest->elems, dest->elems + sbase, delta * sizeof (Idx));
|
||
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
/* Calculate the union set of the sets SRC1 and SRC2. And store it to
|
||
DEST. Return value indicate the error code or REG_NOERROR if succeeded. */
|
||
|
||
static reg_errcode_t
|
||
__attribute_warn_unused_result__
|
||
re_node_set_init_union (re_node_set *dest, const re_node_set *src1,
|
||
const re_node_set *src2)
|
||
{
|
||
Idx i1, i2, id;
|
||
if (src1 != NULL && src1->nelem > 0 && src2 != NULL && src2->nelem > 0)
|
||
{
|
||
dest->alloc = src1->nelem + src2->nelem;
|
||
dest->elems = re_malloc (Idx, dest->alloc);
|
||
if (__glibc_unlikely (dest->elems == NULL))
|
||
return REG_ESPACE;
|
||
}
|
||
else
|
||
{
|
||
if (src1 != NULL && src1->nelem > 0)
|
||
return re_node_set_init_copy (dest, src1);
|
||
else if (src2 != NULL && src2->nelem > 0)
|
||
return re_node_set_init_copy (dest, src2);
|
||
else
|
||
re_node_set_init_empty (dest);
|
||
return REG_NOERROR;
|
||
}
|
||
for (i1 = i2 = id = 0 ; i1 < src1->nelem && i2 < src2->nelem ;)
|
||
{
|
||
if (src1->elems[i1] > src2->elems[i2])
|
||
{
|
||
dest->elems[id++] = src2->elems[i2++];
|
||
continue;
|
||
}
|
||
if (src1->elems[i1] == src2->elems[i2])
|
||
++i2;
|
||
dest->elems[id++] = src1->elems[i1++];
|
||
}
|
||
if (i1 < src1->nelem)
|
||
{
|
||
memcpy (dest->elems + id, src1->elems + i1,
|
||
(src1->nelem - i1) * sizeof (Idx));
|
||
id += src1->nelem - i1;
|
||
}
|
||
else if (i2 < src2->nelem)
|
||
{
|
||
memcpy (dest->elems + id, src2->elems + i2,
|
||
(src2->nelem - i2) * sizeof (Idx));
|
||
id += src2->nelem - i2;
|
||
}
|
||
dest->nelem = id;
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
/* Calculate the union set of the sets DEST and SRC. And store it to
|
||
DEST. Return value indicate the error code or REG_NOERROR if succeeded. */
|
||
|
||
static reg_errcode_t
|
||
__attribute_warn_unused_result__
|
||
re_node_set_merge (re_node_set *dest, const re_node_set *src)
|
||
{
|
||
Idx is, id, sbase, delta;
|
||
if (src == NULL || src->nelem == 0)
|
||
return REG_NOERROR;
|
||
if (dest->alloc < 2 * src->nelem + dest->nelem)
|
||
{
|
||
Idx new_alloc = 2 * (src->nelem + dest->alloc);
|
||
Idx *new_buffer = re_realloc (dest->elems, Idx, new_alloc);
|
||
if (__glibc_unlikely (new_buffer == NULL))
|
||
return REG_ESPACE;
|
||
dest->elems = new_buffer;
|
||
dest->alloc = new_alloc;
|
||
}
|
||
|
||
if (__glibc_unlikely (dest->nelem == 0))
|
||
{
|
||
/* Although we already guaranteed above that dest->alloc != 0 and
|
||
therefore dest->elems != NULL, add a debug assertion to pacify
|
||
GCC 11.2.1's -fanalyzer. */
|
||
DEBUG_ASSERT (dest->elems);
|
||
dest->nelem = src->nelem;
|
||
memcpy (dest->elems, src->elems, src->nelem * sizeof (Idx));
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
/* Copy into the top of DEST the items of SRC that are not
|
||
found in DEST. Maybe we could binary search in DEST? */
|
||
for (sbase = dest->nelem + 2 * src->nelem,
|
||
is = src->nelem - 1, id = dest->nelem - 1; is >= 0 && id >= 0; )
|
||
{
|
||
if (dest->elems[id] == src->elems[is])
|
||
is--, id--;
|
||
else if (dest->elems[id] < src->elems[is])
|
||
dest->elems[--sbase] = src->elems[is--];
|
||
else /* if (dest->elems[id] > src->elems[is]) */
|
||
--id;
|
||
}
|
||
|
||
if (is >= 0)
|
||
{
|
||
/* If DEST is exhausted, the remaining items of SRC must be unique. */
|
||
sbase -= is + 1;
|
||
memcpy (dest->elems + sbase, src->elems, (is + 1) * sizeof (Idx));
|
||
}
|
||
|
||
id = dest->nelem - 1;
|
||
is = dest->nelem + 2 * src->nelem - 1;
|
||
delta = is - sbase + 1;
|
||
if (delta == 0)
|
||
return REG_NOERROR;
|
||
|
||
/* Now copy. When DELTA becomes zero, the remaining
|
||
DEST elements are already in place. */
|
||
dest->nelem += delta;
|
||
for (;;)
|
||
{
|
||
if (dest->elems[is] > dest->elems[id])
|
||
{
|
||
/* Copy from the top. */
|
||
dest->elems[id + delta--] = dest->elems[is--];
|
||
if (delta == 0)
|
||
break;
|
||
}
|
||
else
|
||
{
|
||
/* Slide from the bottom. */
|
||
dest->elems[id + delta] = dest->elems[id];
|
||
if (--id < 0)
|
||
{
|
||
/* Copy remaining SRC elements. */
|
||
memcpy (dest->elems, dest->elems + sbase,
|
||
delta * sizeof (Idx));
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
/* Insert the new element ELEM to the re_node_set* SET.
|
||
SET should not already have ELEM.
|
||
Return true if successful. */
|
||
|
||
static bool
|
||
__attribute_warn_unused_result__
|
||
re_node_set_insert (re_node_set *set, Idx elem)
|
||
{
|
||
Idx idx;
|
||
/* In case the set is empty. */
|
||
if (set->alloc == 0)
|
||
return __glibc_likely (re_node_set_init_1 (set, elem) == REG_NOERROR);
|
||
|
||
if (__glibc_unlikely (set->nelem) == 0)
|
||
{
|
||
/* Although we already guaranteed above that set->alloc != 0 and
|
||
therefore set->elems != NULL, add a debug assertion to pacify
|
||
GCC 11.2 -fanalyzer. */
|
||
DEBUG_ASSERT (set->elems);
|
||
set->elems[0] = elem;
|
||
++set->nelem;
|
||
return true;
|
||
}
|
||
|
||
/* Realloc if we need. */
|
||
if (set->alloc == set->nelem)
|
||
{
|
||
Idx *new_elems;
|
||
set->alloc = set->alloc * 2;
|
||
new_elems = re_realloc (set->elems, Idx, set->alloc);
|
||
if (__glibc_unlikely (new_elems == NULL))
|
||
return false;
|
||
set->elems = new_elems;
|
||
}
|
||
|
||
/* Move the elements which follows the new element. Test the
|
||
first element separately to skip a check in the inner loop. */
|
||
if (elem < set->elems[0])
|
||
{
|
||
for (idx = set->nelem; idx > 0; idx--)
|
||
set->elems[idx] = set->elems[idx - 1];
|
||
}
|
||
else
|
||
{
|
||
for (idx = set->nelem; set->elems[idx - 1] > elem; idx--)
|
||
set->elems[idx] = set->elems[idx - 1];
|
||
DEBUG_ASSERT (set->elems[idx - 1] < elem);
|
||
}
|
||
|
||
/* Insert the new element. */
|
||
set->elems[idx] = elem;
|
||
++set->nelem;
|
||
return true;
|
||
}
|
||
|
||
/* Insert the new element ELEM to the re_node_set* SET.
|
||
SET should not already have any element greater than or equal to ELEM.
|
||
Return true if successful. */
|
||
|
||
static bool
|
||
__attribute_warn_unused_result__
|
||
re_node_set_insert_last (re_node_set *set, Idx elem)
|
||
{
|
||
/* Realloc if we need. */
|
||
if (set->alloc == set->nelem)
|
||
{
|
||
Idx *new_elems;
|
||
set->alloc = (set->alloc + 1) * 2;
|
||
new_elems = re_realloc (set->elems, Idx, set->alloc);
|
||
if (__glibc_unlikely (new_elems == NULL))
|
||
return false;
|
||
set->elems = new_elems;
|
||
}
|
||
|
||
/* Insert the new element. */
|
||
set->elems[set->nelem++] = elem;
|
||
return true;
|
||
}
|
||
|
||
/* Compare two node sets SET1 and SET2.
|
||
Return true if SET1 and SET2 are equivalent. */
|
||
|
||
static bool
|
||
__attribute__ ((pure))
|
||
re_node_set_compare (const re_node_set *set1, const re_node_set *set2)
|
||
{
|
||
Idx i;
|
||
if (set1 == NULL || set2 == NULL || set1->nelem != set2->nelem)
|
||
return false;
|
||
for (i = set1->nelem ; --i >= 0 ; )
|
||
if (set1->elems[i] != set2->elems[i])
|
||
return false;
|
||
return true;
|
||
}
|
||
|
||
/* Return (idx + 1) if SET contains the element ELEM, return 0 otherwise. */
|
||
|
||
static Idx
|
||
__attribute__ ((pure))
|
||
re_node_set_contains (const re_node_set *set, Idx elem)
|
||
{
|
||
__re_size_t idx, right, mid;
|
||
if (set->nelem <= 0)
|
||
return 0;
|
||
|
||
/* Binary search the element. */
|
||
idx = 0;
|
||
right = set->nelem - 1;
|
||
while (idx < right)
|
||
{
|
||
mid = (idx + right) / 2;
|
||
if (set->elems[mid] < elem)
|
||
idx = mid + 1;
|
||
else
|
||
right = mid;
|
||
}
|
||
return set->elems[idx] == elem ? idx + 1 : 0;
|
||
}
|
||
|
||
static void
|
||
re_node_set_remove_at (re_node_set *set, Idx idx)
|
||
{
|
||
if (idx < 0 || idx >= set->nelem)
|
||
return;
|
||
--set->nelem;
|
||
for (; idx < set->nelem; idx++)
|
||
set->elems[idx] = set->elems[idx + 1];
|
||
}
|
||
|
||
|
||
/* Add the token TOKEN to dfa->nodes, and return the index of the token.
|
||
Or return -1 if an error occurred. */
|
||
|
||
static Idx
|
||
re_dfa_add_node (re_dfa_t *dfa, re_token_t token)
|
||
{
|
||
if (__glibc_unlikely (dfa->nodes_len >= dfa->nodes_alloc))
|
||
{
|
||
size_t new_nodes_alloc = dfa->nodes_alloc * 2;
|
||
Idx *new_nexts, *new_indices;
|
||
re_node_set *new_edests, *new_eclosures;
|
||
re_token_t *new_nodes;
|
||
|
||
/* Avoid overflows in realloc. */
|
||
const size_t max_object_size = MAX (sizeof (re_token_t),
|
||
MAX (sizeof (re_node_set),
|
||
sizeof (Idx)));
|
||
if (__glibc_unlikely (MIN (IDX_MAX, SIZE_MAX / max_object_size)
|
||
< new_nodes_alloc))
|
||
return -1;
|
||
|
||
new_nodes = re_realloc (dfa->nodes, re_token_t, new_nodes_alloc);
|
||
if (__glibc_unlikely (new_nodes == NULL))
|
||
return -1;
|
||
dfa->nodes = new_nodes;
|
||
dfa->nodes_alloc = new_nodes_alloc;
|
||
new_nexts = re_realloc (dfa->nexts, Idx, new_nodes_alloc);
|
||
if (new_nexts != NULL)
|
||
dfa->nexts = new_nexts;
|
||
new_indices = re_realloc (dfa->org_indices, Idx, new_nodes_alloc);
|
||
if (new_indices != NULL)
|
||
dfa->org_indices = new_indices;
|
||
new_edests = re_realloc (dfa->edests, re_node_set, new_nodes_alloc);
|
||
if (new_edests != NULL)
|
||
dfa->edests = new_edests;
|
||
new_eclosures = re_realloc (dfa->eclosures, re_node_set, new_nodes_alloc);
|
||
if (new_eclosures != NULL)
|
||
dfa->eclosures = new_eclosures;
|
||
if (__glibc_unlikely (new_nexts == NULL || new_indices == NULL
|
||
|| new_edests == NULL || new_eclosures == NULL))
|
||
return -1;
|
||
}
|
||
dfa->nodes[dfa->nodes_len] = token;
|
||
dfa->nodes[dfa->nodes_len].constraint = 0;
|
||
dfa->nodes[dfa->nodes_len].accept_mb =
|
||
((token.type == OP_PERIOD && dfa->mb_cur_max > 1)
|
||
|| token.type == COMPLEX_BRACKET);
|
||
dfa->nexts[dfa->nodes_len] = -1;
|
||
re_node_set_init_empty (dfa->edests + dfa->nodes_len);
|
||
re_node_set_init_empty (dfa->eclosures + dfa->nodes_len);
|
||
return dfa->nodes_len++;
|
||
}
|
||
|
||
static re_hashval_t
|
||
calc_state_hash (const re_node_set *nodes, unsigned int context)
|
||
{
|
||
re_hashval_t hash = nodes->nelem + context;
|
||
Idx i;
|
||
for (i = 0 ; i < nodes->nelem ; i++)
|
||
hash += nodes->elems[i];
|
||
return hash;
|
||
}
|
||
|
||
/* Search for the state whose node_set is equivalent to NODES.
|
||
Return the pointer to the state, if we found it in the DFA.
|
||
Otherwise create the new one and return it. In case of an error
|
||
return NULL and set the error code in ERR.
|
||
Note: - We assume NULL as the invalid state, then it is possible that
|
||
return value is NULL and ERR is REG_NOERROR.
|
||
- We never return non-NULL value in case of any errors, it is for
|
||
optimization. */
|
||
|
||
static re_dfastate_t *
|
||
__attribute_warn_unused_result__
|
||
re_acquire_state (reg_errcode_t *err, const re_dfa_t *dfa,
|
||
const re_node_set *nodes)
|
||
{
|
||
re_hashval_t hash;
|
||
re_dfastate_t *new_state;
|
||
struct re_state_table_entry *spot;
|
||
Idx i;
|
||
#if defined GCC_LINT || defined lint
|
||
/* Suppress bogus uninitialized-variable warnings. */
|
||
*err = REG_NOERROR;
|
||
#endif
|
||
if (__glibc_unlikely (nodes->nelem == 0))
|
||
{
|
||
*err = REG_NOERROR;
|
||
return NULL;
|
||
}
|
||
hash = calc_state_hash (nodes, 0);
|
||
spot = dfa->state_table + (hash & dfa->state_hash_mask);
|
||
|
||
for (i = 0 ; i < spot->num ; i++)
|
||
{
|
||
re_dfastate_t *state = spot->array[i];
|
||
if (hash != state->hash)
|
||
continue;
|
||
if (re_node_set_compare (&state->nodes, nodes))
|
||
return state;
|
||
}
|
||
|
||
/* There are no appropriate state in the dfa, create the new one. */
|
||
new_state = create_ci_newstate (dfa, nodes, hash);
|
||
if (__glibc_unlikely (new_state == NULL))
|
||
*err = REG_ESPACE;
|
||
|
||
return new_state;
|
||
}
|
||
|
||
/* Search for the state whose node_set is equivalent to NODES and
|
||
whose context is equivalent to CONTEXT.
|
||
Return the pointer to the state, if we found it in the DFA.
|
||
Otherwise create the new one and return it. In case of an error
|
||
return NULL and set the error code in ERR.
|
||
Note: - We assume NULL as the invalid state, then it is possible that
|
||
return value is NULL and ERR is REG_NOERROR.
|
||
- We never return non-NULL value in case of any errors, it is for
|
||
optimization. */
|
||
|
||
static re_dfastate_t *
|
||
__attribute_warn_unused_result__
|
||
re_acquire_state_context (reg_errcode_t *err, const re_dfa_t *dfa,
|
||
const re_node_set *nodes, unsigned int context)
|
||
{
|
||
re_hashval_t hash;
|
||
re_dfastate_t *new_state;
|
||
struct re_state_table_entry *spot;
|
||
Idx i;
|
||
#if defined GCC_LINT || defined lint
|
||
/* Suppress bogus uninitialized-variable warnings. */
|
||
*err = REG_NOERROR;
|
||
#endif
|
||
if (nodes->nelem == 0)
|
||
{
|
||
*err = REG_NOERROR;
|
||
return NULL;
|
||
}
|
||
hash = calc_state_hash (nodes, context);
|
||
spot = dfa->state_table + (hash & dfa->state_hash_mask);
|
||
|
||
for (i = 0 ; i < spot->num ; i++)
|
||
{
|
||
re_dfastate_t *state = spot->array[i];
|
||
if (state->hash == hash
|
||
&& state->context == context
|
||
&& re_node_set_compare (state->entrance_nodes, nodes))
|
||
return state;
|
||
}
|
||
/* There are no appropriate state in 'dfa', create the new one. */
|
||
new_state = create_cd_newstate (dfa, nodes, context, hash);
|
||
if (__glibc_unlikely (new_state == NULL))
|
||
*err = REG_ESPACE;
|
||
|
||
return new_state;
|
||
}
|
||
|
||
/* Finish initialization of the new state NEWSTATE, and using its hash value
|
||
HASH put in the appropriate bucket of DFA's state table. Return value
|
||
indicates the error code if failed. */
|
||
|
||
static reg_errcode_t
|
||
__attribute_warn_unused_result__
|
||
register_state (const re_dfa_t *dfa, re_dfastate_t *newstate,
|
||
re_hashval_t hash)
|
||
{
|
||
struct re_state_table_entry *spot;
|
||
reg_errcode_t err;
|
||
Idx i;
|
||
|
||
newstate->hash = hash;
|
||
err = re_node_set_alloc (&newstate->non_eps_nodes, newstate->nodes.nelem);
|
||
if (__glibc_unlikely (err != REG_NOERROR))
|
||
return REG_ESPACE;
|
||
for (i = 0; i < newstate->nodes.nelem; i++)
|
||
{
|
||
Idx elem = newstate->nodes.elems[i];
|
||
if (!IS_EPSILON_NODE (dfa->nodes[elem].type))
|
||
if (! re_node_set_insert_last (&newstate->non_eps_nodes, elem))
|
||
return REG_ESPACE;
|
||
}
|
||
|
||
spot = dfa->state_table + (hash & dfa->state_hash_mask);
|
||
if (__glibc_unlikely (spot->alloc <= spot->num))
|
||
{
|
||
Idx new_alloc = 2 * spot->num + 2;
|
||
re_dfastate_t **new_array = re_realloc (spot->array, re_dfastate_t *,
|
||
new_alloc);
|
||
if (__glibc_unlikely (new_array == NULL))
|
||
return REG_ESPACE;
|
||
spot->array = new_array;
|
||
spot->alloc = new_alloc;
|
||
}
|
||
spot->array[spot->num++] = newstate;
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
static void
|
||
free_state (re_dfastate_t *state)
|
||
{
|
||
re_node_set_free (&state->non_eps_nodes);
|
||
re_node_set_free (&state->inveclosure);
|
||
if (state->entrance_nodes != &state->nodes)
|
||
{
|
||
re_node_set_free (state->entrance_nodes);
|
||
re_free (state->entrance_nodes);
|
||
}
|
||
re_node_set_free (&state->nodes);
|
||
re_free (state->word_trtable);
|
||
re_free (state->trtable);
|
||
re_free (state);
|
||
}
|
||
|
||
/* Create the new state which is independent of contexts.
|
||
Return the new state if succeeded, otherwise return NULL. */
|
||
|
||
static re_dfastate_t *
|
||
__attribute_warn_unused_result__
|
||
create_ci_newstate (const re_dfa_t *dfa, const re_node_set *nodes,
|
||
re_hashval_t hash)
|
||
{
|
||
Idx i;
|
||
reg_errcode_t err;
|
||
re_dfastate_t *newstate;
|
||
|
||
newstate = (re_dfastate_t *) calloc (sizeof (re_dfastate_t), 1);
|
||
if (__glibc_unlikely (newstate == NULL))
|
||
return NULL;
|
||
err = re_node_set_init_copy (&newstate->nodes, nodes);
|
||
if (__glibc_unlikely (err != REG_NOERROR))
|
||
{
|
||
re_free (newstate);
|
||
return NULL;
|
||
}
|
||
|
||
newstate->entrance_nodes = &newstate->nodes;
|
||
for (i = 0 ; i < nodes->nelem ; i++)
|
||
{
|
||
re_token_t *node = dfa->nodes + nodes->elems[i];
|
||
re_token_type_t type = node->type;
|
||
if (type == CHARACTER && !node->constraint)
|
||
continue;
|
||
newstate->accept_mb |= node->accept_mb;
|
||
|
||
/* If the state has the halt node, the state is a halt state. */
|
||
if (type == END_OF_RE)
|
||
newstate->halt = 1;
|
||
else if (type == OP_BACK_REF)
|
||
newstate->has_backref = 1;
|
||
else if (type == ANCHOR || node->constraint)
|
||
newstate->has_constraint = 1;
|
||
}
|
||
err = register_state (dfa, newstate, hash);
|
||
if (__glibc_unlikely (err != REG_NOERROR))
|
||
{
|
||
free_state (newstate);
|
||
newstate = NULL;
|
||
}
|
||
return newstate;
|
||
}
|
||
|
||
/* Create the new state which is depend on the context CONTEXT.
|
||
Return the new state if succeeded, otherwise return NULL. */
|
||
|
||
static re_dfastate_t *
|
||
__attribute_warn_unused_result__
|
||
create_cd_newstate (const re_dfa_t *dfa, const re_node_set *nodes,
|
||
unsigned int context, re_hashval_t hash)
|
||
{
|
||
Idx i, nctx_nodes = 0;
|
||
reg_errcode_t err;
|
||
re_dfastate_t *newstate;
|
||
|
||
newstate = (re_dfastate_t *) calloc (sizeof (re_dfastate_t), 1);
|
||
if (__glibc_unlikely (newstate == NULL))
|
||
return NULL;
|
||
err = re_node_set_init_copy (&newstate->nodes, nodes);
|
||
if (__glibc_unlikely (err != REG_NOERROR))
|
||
{
|
||
re_free (newstate);
|
||
return NULL;
|
||
}
|
||
|
||
newstate->context = context;
|
||
newstate->entrance_nodes = &newstate->nodes;
|
||
|
||
for (i = 0 ; i < nodes->nelem ; i++)
|
||
{
|
||
re_token_t *node = dfa->nodes + nodes->elems[i];
|
||
re_token_type_t type = node->type;
|
||
unsigned int constraint = node->constraint;
|
||
|
||
if (type == CHARACTER && !constraint)
|
||
continue;
|
||
newstate->accept_mb |= node->accept_mb;
|
||
|
||
/* If the state has the halt node, the state is a halt state. */
|
||
if (type == END_OF_RE)
|
||
newstate->halt = 1;
|
||
else if (type == OP_BACK_REF)
|
||
newstate->has_backref = 1;
|
||
|
||
if (constraint)
|
||
{
|
||
if (newstate->entrance_nodes == &newstate->nodes)
|
||
{
|
||
re_node_set *entrance_nodes = re_malloc (re_node_set, 1);
|
||
if (__glibc_unlikely (entrance_nodes == NULL))
|
||
{
|
||
free_state (newstate);
|
||
return NULL;
|
||
}
|
||
newstate->entrance_nodes = entrance_nodes;
|
||
if (re_node_set_init_copy (newstate->entrance_nodes, nodes)
|
||
!= REG_NOERROR)
|
||
{
|
||
free_state (newstate);
|
||
return NULL;
|
||
}
|
||
nctx_nodes = 0;
|
||
newstate->has_constraint = 1;
|
||
}
|
||
|
||
if (NOT_SATISFY_PREV_CONSTRAINT (constraint,context))
|
||
{
|
||
re_node_set_remove_at (&newstate->nodes, i - nctx_nodes);
|
||
++nctx_nodes;
|
||
}
|
||
}
|
||
}
|
||
err = register_state (dfa, newstate, hash);
|
||
if (__glibc_unlikely (err != REG_NOERROR))
|
||
{
|
||
free_state (newstate);
|
||
newstate = NULL;
|
||
}
|
||
return newstate;
|
||
}
|