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regex_internal.c
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/* Extended regular expression matching and search library.
Copyright (C) 2002-2006, 2010 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Isamu Hasegawa <[email protected]>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
static void re_string_construct_common (const char *str, int len,
re_string_t *pstr,
RE_TRANSLATE_TYPE trans, int icase,
const re_dfa_t *dfa) internal_function;
static re_dfastate_t *create_ci_newstate (const re_dfa_t *dfa,
const re_node_set *nodes,
unsigned int hash) internal_function;
static re_dfastate_t *create_cd_newstate (const re_dfa_t *dfa,
const re_node_set *nodes,
unsigned int context,
unsigned int hash) internal_function;
#ifdef GAWK
#undef MAX /* safety */
static int
MAX(size_t a, size_t b)
{
return (a > b ? a : b);
}
#endif
/* Functions for string operation. */
/* This function allocate the buffers. It is necessary to call
re_string_reconstruct before using the object. */
static reg_errcode_t
internal_function
re_string_allocate (re_string_t *pstr, const char *str, int len, int init_len,
RE_TRANSLATE_TYPE trans, int icase, const re_dfa_t *dfa)
{
reg_errcode_t ret;
int init_buf_len;
/* Ensure at least one character fits into the buffers. */
if (init_len < dfa->mb_cur_max)
init_len = dfa->mb_cur_max;
init_buf_len = (len + 1 < init_len) ? len + 1: init_len;
re_string_construct_common (str, len, pstr, trans, icase, dfa);
ret = re_string_realloc_buffers (pstr, init_buf_len);
if (BE (ret != REG_NOERROR, 0))
return ret;
pstr->word_char = dfa->word_char;
pstr->word_ops_used = dfa->word_ops_used;
pstr->mbs = pstr->mbs_allocated ? pstr->mbs : (unsigned char *) str;
pstr->valid_len = (pstr->mbs_allocated || dfa->mb_cur_max > 1) ? 0 : len;
pstr->valid_raw_len = pstr->valid_len;
return REG_NOERROR;
}
/* This function allocate the buffers, and initialize them. */
static reg_errcode_t
internal_function
re_string_construct (re_string_t *pstr, const char *str, int len,
RE_TRANSLATE_TYPE trans, int icase, const re_dfa_t *dfa)
{
reg_errcode_t ret;
memset (pstr, '\0', sizeof (re_string_t));
re_string_construct_common (str, len, pstr, trans, icase, dfa);
if (len > 0)
{
ret = re_string_realloc_buffers (pstr, len + 1);
if (BE (ret != REG_NOERROR, 0))
return ret;
}
pstr->mbs = pstr->mbs_allocated ? pstr->mbs : (unsigned char *) str;
if (icase)
{
#ifdef RE_ENABLE_I18N
if (dfa->mb_cur_max > 1)
{
while (1)
{
ret = build_wcs_upper_buffer (pstr);
if (BE (ret != REG_NOERROR, 0))
return ret;
if (pstr->valid_raw_len >= len)
break;
if (pstr->bufs_len > pstr->valid_len + dfa->mb_cur_max)
break;
ret = re_string_realloc_buffers (pstr, pstr->bufs_len * 2);
if (BE (ret != REG_NOERROR, 0))
return ret;
}
}
else
#endif /* RE_ENABLE_I18N */
build_upper_buffer (pstr);
}
else
{
#ifdef RE_ENABLE_I18N
if (dfa->mb_cur_max > 1)
build_wcs_buffer (pstr);
else
#endif /* RE_ENABLE_I18N */
{
if (trans != NULL)
re_string_translate_buffer (pstr);
else
{
pstr->valid_len = pstr->bufs_len;
pstr->valid_raw_len = pstr->bufs_len;
}
}
}
return REG_NOERROR;
}
/* Helper functions for re_string_allocate, and re_string_construct. */
static reg_errcode_t
internal_function
re_string_realloc_buffers (re_string_t *pstr, int new_buf_len)
{
#ifdef RE_ENABLE_I18N
if (pstr->mb_cur_max > 1)
{
wint_t *new_wcs;
/* Avoid overflow in realloc. */
const size_t max_object_size = MAX (sizeof (wint_t), sizeof (int));
if (BE (SIZE_MAX / max_object_size < new_buf_len, 0))
return REG_ESPACE;
new_wcs = re_realloc (pstr->wcs, wint_t, new_buf_len);
if (BE (new_wcs == NULL, 0))
return REG_ESPACE;
pstr->wcs = new_wcs;
if (pstr->offsets != NULL)
{
int *new_offsets = re_realloc (pstr->offsets, int, new_buf_len);
if (BE (new_offsets == NULL, 0))
return REG_ESPACE;
pstr->offsets = new_offsets;
}
}
#endif /* RE_ENABLE_I18N */
if (pstr->mbs_allocated)
{
unsigned char *new_mbs = re_realloc (pstr->mbs, unsigned char,
new_buf_len);
if (BE (new_mbs == NULL, 0))
return REG_ESPACE;
pstr->mbs = new_mbs;
}
pstr->bufs_len = new_buf_len;
return REG_NOERROR;
}
static void
internal_function
re_string_construct_common (const char *str, int len, re_string_t *pstr,
RE_TRANSLATE_TYPE trans, int icase,
const re_dfa_t *dfa)
{
pstr->raw_mbs = (const unsigned char *) str;
pstr->len = len;
pstr->raw_len = len;
pstr->trans = trans;
pstr->icase = icase ? 1 : 0;
pstr->mbs_allocated = (trans != NULL || icase);
pstr->mb_cur_max = dfa->mb_cur_max;
pstr->is_utf8 = dfa->is_utf8;
pstr->map_notascii = dfa->map_notascii;
pstr->stop = pstr->len;
pstr->raw_stop = pstr->stop;
}
#ifdef RE_ENABLE_I18N
/* Build wide character buffer PSTR->WCS.
If the byte sequence of the string are:
<mb1>(0), <mb1>(1), <mb2>(0), <mb2>(1), <sb3>
Then wide character buffer will be:
<wc1> , WEOF , <wc2> , WEOF , <wc3>
We use WEOF for padding, they indicate that the position isn't
a first byte of a multibyte character.
Note that this function assumes PSTR->VALID_LEN elements are already
built and starts from PSTR->VALID_LEN. */
static void
internal_function
build_wcs_buffer (re_string_t *pstr)
{
#ifdef _LIBC
unsigned char buf[MB_LEN_MAX];
assert (MB_LEN_MAX >= pstr->mb_cur_max);
#else
unsigned char buf[64];
#endif
mbstate_t prev_st;
int byte_idx, end_idx, remain_len;
size_t mbclen;
/* Build the buffers from pstr->valid_len to either pstr->len or
pstr->bufs_len. */
end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
for (byte_idx = pstr->valid_len; byte_idx < end_idx;)
{
wchar_t wc;
const char *p;
remain_len = end_idx - byte_idx;
prev_st = pstr->cur_state;
/* Apply the translation if we need. */
if (BE (pstr->trans != NULL, 0))
{
int i, ch;
for (i = 0; i < pstr->mb_cur_max && i < remain_len; ++i)
{
ch = pstr->raw_mbs [pstr->raw_mbs_idx + byte_idx + i];
buf[i] = pstr->mbs[byte_idx + i] = pstr->trans[ch];
}
p = (const char *) buf;
}
else
p = (const char *) pstr->raw_mbs + pstr->raw_mbs_idx + byte_idx;
mbclen = __mbrtowc (&wc, p, remain_len, &pstr->cur_state);
if (BE (mbclen == (size_t) -2, 0))
{
/* The buffer doesn't have enough space, finish to build. */
pstr->cur_state = prev_st;
break;
}
else if (BE (mbclen == (size_t) -1 || mbclen == 0, 0))
{
/* We treat these cases as a singlebyte character. */
mbclen = 1;
wc = (wchar_t) pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx];
if (BE (pstr->trans != NULL, 0))
wc = pstr->trans[wc];
pstr->cur_state = prev_st;
}
/* Write wide character and padding. */
pstr->wcs[byte_idx++] = wc;
/* Write paddings. */
for (remain_len = byte_idx + mbclen - 1; byte_idx < remain_len ;)
pstr->wcs[byte_idx++] = WEOF;
}
pstr->valid_len = byte_idx;
pstr->valid_raw_len = byte_idx;
}
/* Build wide character buffer PSTR->WCS like build_wcs_buffer,
but for REG_ICASE. */
static reg_errcode_t
internal_function
build_wcs_upper_buffer (re_string_t *pstr)
{
mbstate_t prev_st;
int src_idx, byte_idx, end_idx, remain_len;
size_t mbclen;
#ifdef _LIBC
char buf[MB_LEN_MAX];
assert (MB_LEN_MAX >= pstr->mb_cur_max);
#else
char buf[64];
#endif
byte_idx = pstr->valid_len;
end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
/* 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;
if (isascii (pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx])
&& mbsinit (&pstr->cur_state))
{
/* In case of a singlebyte character. */
pstr->mbs[byte_idx]
= toupper (pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx]);
/* The next step uses the assumption that wchar_t is encoded
ASCII-safe: all ASCII values can be converted like this. */
pstr->wcs[byte_idx] = (wchar_t) pstr->mbs[byte_idx];
++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 (BE (mbclen + 2 > 2, 1))
{
wchar_t wcu = wc;
if (iswlower (wc))
{
size_t mbcdlen;
wcu = towupper (wc);
mbcdlen = wcrtomb (buf, wcu, &prev_st);
if (BE (mbclen == mbcdlen, 1))
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)
{
/* It is an invalid character or '\0'. Just use the byte. */
int ch = pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx];
pstr->mbs[byte_idx] = ch;
/* And also cast it to wide char. */
pstr->wcs[byte_idx++] = (wchar_t) ch;
if (BE (mbclen == (size_t) -1, 0))
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 (BE (pstr->trans != NULL, 0))
{
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 (BE (mbclen + 2 > 2, 1))
{
wchar_t wcu = wc;
if (iswlower (wc))
{
size_t mbcdlen;
wcu = towupper (wc);
mbcdlen = wcrtomb ((char *) buf, wcu, &prev_st);
if (BE (mbclen == mbcdlen, 1))
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 (int, 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 (BE (pstr->offsets_needed != 0, 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)
{
/* It is an invalid character or '\0'. Just use the byte. */
int ch = pstr->raw_mbs[pstr->raw_mbs_idx + src_idx];
if (BE (pstr->trans != NULL, 0))
ch = pstr->trans [ch];
pstr->mbs[byte_idx] = ch;
if (BE (pstr->offsets_needed != 0, 0))
pstr->offsets[byte_idx] = src_idx;
++src_idx;
/* And also cast it to wide char. */
pstr->wcs[byte_idx++] = (wchar_t) ch;
if (BE (mbclen == (size_t) -1, 0))
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 int
internal_function
re_string_skip_chars (re_string_t *pstr, int new_raw_idx, wint_t *last_wc)
{
mbstate_t prev_st;
int 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;
int remain_len = pstr->len - rawbuf_idx;
prev_st = pstr->cur_state;
mbclen = __mbrtowc (&wc2, (const char *) pstr->raw_mbs + rawbuf_idx,
remain_len, &pstr->cur_state);
if (BE (mbclen == (size_t) -2 || mbclen == (size_t) -1 || mbclen == 0, 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 = (wint_t) wc2;
/* Then proceed the next character. */
rawbuf_idx += mbclen;
}
*last_wc = (wint_t) wc;
return rawbuf_idx;
}
#endif /* RE_ENABLE_I18N */
/* Build the buffer PSTR->MBS, and apply the translation if we need.
This function is used in case of REG_ICASE. */
static void
internal_function
build_upper_buffer (re_string_t *pstr)
{
int 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 (BE (pstr->trans != NULL, 0))
ch = pstr->trans[ch];
if (islower (ch))
pstr->mbs[char_idx] = toupper (ch);
else
pstr->mbs[char_idx] = ch;
}
pstr->valid_len = char_idx;
pstr->valid_raw_len = char_idx;
}
/* Apply TRANS to the buffer in PSTR. */
static void
internal_function
re_string_translate_buffer (re_string_t *pstr)
{
int 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
internal_function
re_string_reconstruct (re_string_t *pstr, int idx, int eflags)
{
int offset = idx - pstr->raw_mbs_idx;
if (BE (offset < 0, 0))
{
/* Reset buffer. */
#ifdef RE_ENABLE_I18N
if (pstr->mb_cur_max > 1)
memset (&pstr->cur_state, '\0', sizeof (mbstate_t));
#endif /* RE_ENABLE_I18N */
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 (BE (offset != 0, 1))
{
/* Should the already checked characters be kept? */
if (BE (offset < pstr->valid_raw_len, 1))
{
/* Yes, move them to the front of the buffer. */
#ifdef RE_ENABLE_I18N
if (BE (pstr->offsets_needed, 0))
{
int low = 0, high = pstr->valid_len, mid;
do
{
mid = low + (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
#endif
{
pstr->tip_context = re_string_context_at (pstr, offset - 1,
eflags);
#ifdef RE_ENABLE_I18N
if (pstr->mb_cur_max > 1)
memmove (pstr->wcs, pstr->wcs + offset,
(pstr->valid_len - offset) * sizeof (wint_t));
#endif /* RE_ENABLE_I18N */
if (BE (pstr->mbs_allocated, 0))
memmove (pstr->mbs, pstr->mbs + offset,
pstr->valid_len - offset);
pstr->valid_len -= offset;
pstr->valid_raw_len -= offset;
#if DEBUG
assert (pstr->valid_len > 0);
#endif
}
}
else
{
#ifdef RE_ENABLE_I18N
/* No, skip all characters until IDX. */
int prev_valid_len = pstr->valid_len;
if (BE (pstr->offsets_needed, 0))
{
pstr->len = pstr->raw_len - idx + offset;
pstr->stop = pstr->raw_stop - idx + offset;
pstr->offsets_needed = 0;
}
#endif
pstr->valid_len = 0;
#ifdef RE_ENABLE_I18N
if (pstr->mb_cur_max > 1)
{
int 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) && BE (pstr->trans == NULL, 1))
{
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;
int mlen = raw + pstr->len - p;
unsigned char buf[6];
size_t mbclen;
if (BE (pstr->trans != NULL, 0))
{
int i = mlen < 6 ? mlen : 6;
while (--i >= 0)
buf[i] = pstr->trans[p[i]];
}
/* 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 *) p, 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 = ((BE (pstr->word_ops_used != 0, 0)
&& IS_WIDE_WORD_CHAR (wc))
? CONTEXT_WORD
: ((IS_WIDE_NEWLINE (wc)
&& pstr->newline_anchor)
? CONTEXT_NEWLINE : 0));
if (BE (pstr->valid_len, 0))
{
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
#endif /* RE_ENABLE_I18N */
{
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 (!BE (pstr->mbs_allocated, 0))
pstr->mbs += offset;
}
pstr->raw_mbs_idx = idx;
pstr->len -= offset;
pstr->stop -= offset;
/* Then build the buffers. */
#ifdef RE_ENABLE_I18N
if (pstr->mb_cur_max > 1)
{
if (pstr->icase)
{
reg_errcode_t ret = build_wcs_upper_buffer (pstr);
if (BE (ret != REG_NOERROR, 0))
return ret;
}
else
build_wcs_buffer (pstr);
}
else
#endif /* RE_ENABLE_I18N */
if (BE (pstr->mbs_allocated, 0))
{
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
internal_function __attribute ((pure))
re_string_peek_byte_case (const re_string_t *pstr, int idx)
{
int ch, off;
/* Handle the common (easiest) cases first. */
if (BE (!pstr->mbs_allocated, 1))
return re_string_peek_byte (pstr, idx);
#ifdef RE_ENABLE_I18N
if (pstr->mb_cur_max > 1
&& ! re_string_is_single_byte_char (pstr, pstr->cur_idx + idx))
return re_string_peek_byte (pstr, idx);
#endif
off = pstr->cur_idx + idx;
#ifdef RE_ENABLE_I18N
if (pstr->offsets_needed)
off = pstr->offsets[off];
#endif
ch = pstr->raw_mbs[pstr->raw_mbs_idx + off];
#ifdef RE_ENABLE_I18N
/* 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);
#endif
return ch;
}
static unsigned char
internal_function __attribute ((pure))
re_string_fetch_byte_case (re_string_t *pstr)
{
if (BE (!pstr->mbs_allocated, 1))
return re_string_fetch_byte (pstr);
#ifdef RE_ENABLE_I18N
if (pstr->offsets_needed)
{
int off, 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;
}
#endif
return pstr->raw_mbs[pstr->raw_mbs_idx + pstr->cur_idx++];
}
static void
internal_function
re_string_destruct (re_string_t *pstr)
{
#ifdef RE_ENABLE_I18N
re_free (pstr->wcs);
re_free (pstr->offsets);
#endif /* RE_ENABLE_I18N */
if (pstr->mbs_allocated)
re_free (pstr->mbs);
}
/* Return the context at IDX in INPUT. */
static unsigned int
internal_function
re_string_context_at (const re_string_t *input, int idx, int eflags)
{
int c;
if (BE (idx < 0, 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 (BE (idx == input->len, 0))
return ((eflags & REG_NOTEOL) ? CONTEXT_ENDBUF
: CONTEXT_NEWLINE | CONTEXT_ENDBUF);
#ifdef RE_ENABLE_I18N
if (input->mb_cur_max > 1)
{
wint_t wc;
int wc_idx = idx;
while(input->wcs[wc_idx] == WEOF)
{
#ifdef DEBUG
/* It must not happen. */
assert (wc_idx >= 0);
#endif
--wc_idx;
if (wc_idx < 0)
return input->tip_context;
}
wc = input->wcs[wc_idx];
if (BE (input->word_ops_used != 0, 0) && IS_WIDE_WORD_CHAR (wc))
return CONTEXT_WORD;
return (IS_WIDE_NEWLINE (wc) && input->newline_anchor
? CONTEXT_NEWLINE : 0);
}
else
#endif
{
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
internal_function
re_node_set_alloc (re_node_set *set, int size)
{
/*
* ADR: valgrind says size can be 0, which then doesn't
* free the block of size 0. Harumph. This seems
* to work ok, though.
*/
if (size == 0)
{
memset(set, 0, sizeof(*set));
return REG_NOERROR;
}
set->alloc = size;
set->nelem = 0;
set->elems = re_malloc (int, size);
if (BE (set->elems == NULL, 0))
return REG_ESPACE;
return REG_NOERROR;
}
static reg_errcode_t
internal_function
re_node_set_init_1 (re_node_set *set, int elem)
{
set->alloc = 1;
set->nelem = 1;
set->elems = re_malloc (int, 1);
if (BE (set->elems == NULL, 0))
{
set->alloc = set->nelem = 0;
return REG_ESPACE;