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regcomp.c
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/* Extended regular expression matching and search library.
Copyright (C) 2002,2003,2004,2005,2006,2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
static reg_errcode_t re_compile_internal (regex_t *preg, const char * pattern,
size_t length, reg_syntax_t syntax);
static void re_compile_fastmap_iter (regex_t *bufp,
const re_dfastate_t *init_state,
char *fastmap);
static reg_errcode_t init_dfa (re_dfa_t *dfa, size_t pat_len);
#ifdef RE_ENABLE_I18N
static void free_charset (re_charset_t *cset);
#endif /* RE_ENABLE_I18N */
static void free_workarea_compile (regex_t *preg);
static reg_errcode_t create_initial_state (re_dfa_t *dfa);
#ifdef RE_ENABLE_I18N
static void optimize_utf8 (re_dfa_t *dfa);
#endif
static reg_errcode_t analyze (regex_t *preg);
static reg_errcode_t preorder (bin_tree_t *root,
reg_errcode_t (fn (void *, bin_tree_t *)),
void *extra);
static reg_errcode_t postorder (bin_tree_t *root,
reg_errcode_t (fn (void *, bin_tree_t *)),
void *extra);
static reg_errcode_t optimize_subexps (void *extra, bin_tree_t *node);
static reg_errcode_t lower_subexps (void *extra, bin_tree_t *node);
static bin_tree_t *lower_subexp (reg_errcode_t *err, regex_t *preg,
bin_tree_t *node);
static reg_errcode_t calc_first (void *extra, bin_tree_t *node);
static reg_errcode_t calc_next (void *extra, bin_tree_t *node);
static reg_errcode_t link_nfa_nodes (void *extra, bin_tree_t *node);
static int duplicate_node (re_dfa_t *dfa, int org_idx, unsigned int constraint);
static int search_duplicated_node (const re_dfa_t *dfa, int org_node,
unsigned int constraint);
static reg_errcode_t calc_eclosure (re_dfa_t *dfa);
static reg_errcode_t calc_eclosure_iter (re_node_set *new_set, re_dfa_t *dfa,
int node, int root);
static reg_errcode_t calc_inveclosure (re_dfa_t *dfa);
static int fetch_number (re_string_t *input, re_token_t *token,
reg_syntax_t syntax);
static int peek_token (re_token_t *token, re_string_t *input,
reg_syntax_t syntax) internal_function;
static bin_tree_t *parse (re_string_t *regexp, regex_t *preg,
reg_syntax_t syntax, reg_errcode_t *err);
static bin_tree_t *parse_reg_exp (re_string_t *regexp, regex_t *preg,
re_token_t *token, reg_syntax_t syntax,
int nest, reg_errcode_t *err);
static bin_tree_t *parse_branch (re_string_t *regexp, regex_t *preg,
re_token_t *token, reg_syntax_t syntax,
int nest, reg_errcode_t *err);
static bin_tree_t *parse_expression (re_string_t *regexp, regex_t *preg,
re_token_t *token, reg_syntax_t syntax,
int nest, reg_errcode_t *err);
static bin_tree_t *parse_sub_exp (re_string_t *regexp, regex_t *preg,
re_token_t *token, reg_syntax_t syntax,
int nest, reg_errcode_t *err);
static bin_tree_t *parse_dup_op (bin_tree_t *dup_elem, re_string_t *regexp,
re_dfa_t *dfa, re_token_t *token,
reg_syntax_t syntax, reg_errcode_t *err);
static bin_tree_t *parse_bracket_exp (re_string_t *regexp, re_dfa_t *dfa,
re_token_t *token, reg_syntax_t syntax,
reg_errcode_t *err);
static reg_errcode_t parse_bracket_element (bracket_elem_t *elem,
re_string_t *regexp,
re_token_t *token, int token_len,
re_dfa_t *dfa,
reg_syntax_t syntax,
int accept_hyphen);
static reg_errcode_t parse_bracket_symbol (bracket_elem_t *elem,
re_string_t *regexp,
re_token_t *token);
#ifdef RE_ENABLE_I18N
static reg_errcode_t build_equiv_class (bitset_t sbcset,
re_charset_t *mbcset,
int *equiv_class_alloc,
const unsigned char *name);
static reg_errcode_t build_charclass (RE_TRANSLATE_TYPE trans,
bitset_t sbcset,
re_charset_t *mbcset,
int *char_class_alloc,
const unsigned char *class_name,
reg_syntax_t syntax);
#else /* not RE_ENABLE_I18N */
static reg_errcode_t build_equiv_class (bitset_t sbcset,
const unsigned char *name);
static reg_errcode_t build_charclass (RE_TRANSLATE_TYPE trans,
bitset_t sbcset,
const unsigned char *class_name,
reg_syntax_t syntax);
#endif /* not RE_ENABLE_I18N */
static bin_tree_t *build_charclass_op (re_dfa_t *dfa,
RE_TRANSLATE_TYPE trans,
const unsigned char *class_name,
const unsigned char *extra,
int non_match, reg_errcode_t *err);
static bin_tree_t *create_tree (re_dfa_t *dfa,
bin_tree_t *left, bin_tree_t *right,
re_token_type_t type);
static bin_tree_t *create_token_tree (re_dfa_t *dfa,
bin_tree_t *left, bin_tree_t *right,
const re_token_t *token);
static bin_tree_t *duplicate_tree (const bin_tree_t *src, re_dfa_t *dfa);
static void free_token (re_token_t *node);
static reg_errcode_t free_tree (void *extra, bin_tree_t *node);
static reg_errcode_t mark_opt_subexp (void *extra, bin_tree_t *node);
/* This table gives an error message for each of the error codes listed
in regex.h. Obviously the order here has to be same as there.
POSIX doesn't require that we do anything for REG_NOERROR,
but why not be nice? */
const char __re_error_msgid[] attribute_hidden =
{
#define REG_NOERROR_IDX 0
gettext_noop ("Success") /* REG_NOERROR */
"\0"
#define REG_NOMATCH_IDX (REG_NOERROR_IDX + sizeof "Success")
gettext_noop ("No match") /* REG_NOMATCH */
"\0"
#define REG_BADPAT_IDX (REG_NOMATCH_IDX + sizeof "No match")
gettext_noop ("Invalid regular expression") /* REG_BADPAT */
"\0"
#define REG_ECOLLATE_IDX (REG_BADPAT_IDX + sizeof "Invalid regular expression")
gettext_noop ("Invalid collation character") /* REG_ECOLLATE */
"\0"
#define REG_ECTYPE_IDX (REG_ECOLLATE_IDX + sizeof "Invalid collation character")
gettext_noop ("Invalid character class name") /* REG_ECTYPE */
"\0"
#define REG_EESCAPE_IDX (REG_ECTYPE_IDX + sizeof "Invalid character class name")
gettext_noop ("Trailing backslash") /* REG_EESCAPE */
"\0"
#define REG_ESUBREG_IDX (REG_EESCAPE_IDX + sizeof "Trailing backslash")
gettext_noop ("Invalid back reference") /* REG_ESUBREG */
"\0"
#define REG_EBRACK_IDX (REG_ESUBREG_IDX + sizeof "Invalid back reference")
gettext_noop ("Unmatched [ or [^") /* REG_EBRACK */
"\0"
#define REG_EPAREN_IDX (REG_EBRACK_IDX + sizeof "Unmatched [ or [^")
gettext_noop ("Unmatched ( or \\(") /* REG_EPAREN */
"\0"
#define REG_EBRACE_IDX (REG_EPAREN_IDX + sizeof "Unmatched ( or \\(")
gettext_noop ("Unmatched \\{") /* REG_EBRACE */
"\0"
#define REG_BADBR_IDX (REG_EBRACE_IDX + sizeof "Unmatched \\{")
gettext_noop ("Invalid content of \\{\\}") /* REG_BADBR */
"\0"
#define REG_ERANGE_IDX (REG_BADBR_IDX + sizeof "Invalid content of \\{\\}")
gettext_noop ("Invalid range end") /* REG_ERANGE */
"\0"
#define REG_ESPACE_IDX (REG_ERANGE_IDX + sizeof "Invalid range end")
gettext_noop ("Memory exhausted") /* REG_ESPACE */
"\0"
#define REG_BADRPT_IDX (REG_ESPACE_IDX + sizeof "Memory exhausted")
gettext_noop ("Invalid preceding regular expression") /* REG_BADRPT */
"\0"
#define REG_EEND_IDX (REG_BADRPT_IDX + sizeof "Invalid preceding regular expression")
gettext_noop ("Premature end of regular expression") /* REG_EEND */
"\0"
#define REG_ESIZE_IDX (REG_EEND_IDX + sizeof "Premature end of regular expression")
gettext_noop ("Regular expression too big") /* REG_ESIZE */
"\0"
#define REG_ERPAREN_IDX (REG_ESIZE_IDX + sizeof "Regular expression too big")
gettext_noop ("Unmatched ) or \\)") /* REG_ERPAREN */
};
const size_t __re_error_msgid_idx[] attribute_hidden =
{
REG_NOERROR_IDX,
REG_NOMATCH_IDX,
REG_BADPAT_IDX,
REG_ECOLLATE_IDX,
REG_ECTYPE_IDX,
REG_EESCAPE_IDX,
REG_ESUBREG_IDX,
REG_EBRACK_IDX,
REG_EPAREN_IDX,
REG_EBRACE_IDX,
REG_BADBR_IDX,
REG_ERANGE_IDX,
REG_ESPACE_IDX,
REG_BADRPT_IDX,
REG_EEND_IDX,
REG_ESIZE_IDX,
REG_ERPAREN_IDX
};
/* Entry points for GNU code. */
/* re_compile_pattern is the GNU regular expression compiler: it
compiles PATTERN (of length LENGTH) and puts the result in BUFP.
Returns 0 if the pattern was valid, otherwise an error string.
Assumes the `allocated' (and perhaps `buffer') and `translate' fields
are set in BUFP on entry. */
const char *
re_compile_pattern (pattern, length, bufp)
const char *pattern;
size_t length;
struct re_pattern_buffer *bufp;
{
reg_errcode_t ret;
/* And GNU code determines whether or not to get register information
by passing null for the REGS argument to re_match, etc., not by
setting no_sub, unless RE_NO_SUB is set. */
bufp->no_sub = !!(re_syntax_options & RE_NO_SUB);
/* Match anchors at newline. */
bufp->newline_anchor = 1;
ret = re_compile_internal (bufp, pattern, length, re_syntax_options);
if (!ret)
return NULL;
return gettext (__re_error_msgid + __re_error_msgid_idx[(int) ret]);
}
#ifdef _LIBC
weak_alias (__re_compile_pattern, re_compile_pattern)
#endif
/* Set by `re_set_syntax' to the current regexp syntax to recognize. Can
also be assigned to arbitrarily: each pattern buffer stores its own
syntax, so it can be changed between regex compilations. */
/* This has no initializer because initialized variables in Emacs
become read-only after dumping. */
reg_syntax_t re_syntax_options;
/* Specify the precise syntax of regexps for compilation. This provides
for compatibility for various utilities which historically have
different, incompatible syntaxes.
The argument SYNTAX is a bit mask comprised of the various bits
defined in regex.h. We return the old syntax. */
reg_syntax_t
re_set_syntax (syntax)
reg_syntax_t syntax;
{
reg_syntax_t ret = re_syntax_options;
re_syntax_options = syntax;
return ret;
}
#ifdef _LIBC
weak_alias (__re_set_syntax, re_set_syntax)
#endif
int
re_compile_fastmap (bufp)
struct re_pattern_buffer *bufp;
{
re_dfa_t *dfa = (re_dfa_t *) bufp->buffer;
char *fastmap = bufp->fastmap;
memset (fastmap, '\0', sizeof (char) * SBC_MAX);
re_compile_fastmap_iter (bufp, dfa->init_state, fastmap);
if (dfa->init_state != dfa->init_state_word)
re_compile_fastmap_iter (bufp, dfa->init_state_word, fastmap);
if (dfa->init_state != dfa->init_state_nl)
re_compile_fastmap_iter (bufp, dfa->init_state_nl, fastmap);
if (dfa->init_state != dfa->init_state_begbuf)
re_compile_fastmap_iter (bufp, dfa->init_state_begbuf, fastmap);
bufp->fastmap_accurate = 1;
return 0;
}
#ifdef _LIBC
weak_alias (__re_compile_fastmap, re_compile_fastmap)
#endif
static inline void
__attribute ((always_inline))
re_set_fastmap (char *fastmap, int icase, int ch)
{
fastmap[ch] = 1;
if (icase)
fastmap[tolower (ch)] = 1;
}
/* Helper function for re_compile_fastmap.
Compile fastmap for the initial_state INIT_STATE. */
static void
re_compile_fastmap_iter (regex_t *bufp, const re_dfastate_t *init_state,
char *fastmap)
{
re_dfa_t *dfa = (re_dfa_t *) bufp->buffer;
int node_cnt;
int icase = (dfa->mb_cur_max == 1 && (bufp->syntax & RE_ICASE));
for (node_cnt = 0; node_cnt < init_state->nodes.nelem; ++node_cnt)
{
int node = init_state->nodes.elems[node_cnt];
re_token_type_t type = dfa->nodes[node].type;
if (type == CHARACTER)
{
re_set_fastmap (fastmap, icase, dfa->nodes[node].opr.c);
#ifdef RE_ENABLE_I18N
if ((bufp->syntax & RE_ICASE) && dfa->mb_cur_max > 1)
{
unsigned char *buf = alloca (dfa->mb_cur_max), *p;
wchar_t wc;
mbstate_t state;
p = buf;
*p++ = dfa->nodes[node].opr.c;
while (++node < dfa->nodes_len
&& dfa->nodes[node].type == CHARACTER
&& dfa->nodes[node].mb_partial)
*p++ = dfa->nodes[node].opr.c;
memset (&state, '\0', sizeof (state));
if (mbrtowc (&wc, (const char *) buf, p - buf,
&state) == p - buf
&& (__wcrtomb ((char *) buf, towlower (wc), &state)
!= (size_t) -1))
re_set_fastmap (fastmap, 0, buf[0]);
}
#endif
}
else if (type == SIMPLE_BRACKET)
{
int i, ch;
for (i = 0, ch = 0; i < BITSET_WORDS; ++i)
{
int j;
bitset_word_t w = dfa->nodes[node].opr.sbcset[i];
for (j = 0; j < BITSET_WORD_BITS; ++j, ++ch)
if (w & ((bitset_word_t) 1 << j))
re_set_fastmap (fastmap, icase, ch);
}
}
#ifdef RE_ENABLE_I18N
else if (type == COMPLEX_BRACKET)
{
int i;
re_charset_t *cset = dfa->nodes[node].opr.mbcset;
if (cset->non_match || cset->ncoll_syms || cset->nequiv_classes
|| cset->nranges || cset->nchar_classes)
{
# ifdef _LIBC
if (_NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES) != 0)
{
/* In this case we want to catch the bytes which are
the first byte of any collation elements.
e.g. In da_DK, we want to catch 'a' since "aa"
is a valid collation element, and don't catch
'b' since 'b' is the only collation element
which starts from 'b'. */
const int32_t *table = (const int32_t *)
_NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);
for (i = 0; i < SBC_MAX; ++i)
if (table[i] < 0)
re_set_fastmap (fastmap, icase, i);
}
# else
if (dfa->mb_cur_max > 1)
for (i = 0; i < SBC_MAX; ++i)
if (__btowc (i) == WEOF)
re_set_fastmap (fastmap, icase, i);
# endif /* not _LIBC */
}
for (i = 0; i < cset->nmbchars; ++i)
{
char buf[256];
mbstate_t state;
memset (&state, '\0', sizeof (state));
if (__wcrtomb (buf, cset->mbchars[i], &state) != (size_t) -1)
re_set_fastmap (fastmap, icase, *(unsigned char *) buf);
if ((bufp->syntax & RE_ICASE) && dfa->mb_cur_max > 1)
{
if (__wcrtomb (buf, towlower (cset->mbchars[i]), &state)
!= (size_t) -1)
re_set_fastmap (fastmap, 0, *(unsigned char *) buf);
}
}
}
#endif /* RE_ENABLE_I18N */
else if (type == OP_PERIOD
#ifdef RE_ENABLE_I18N
|| type == OP_UTF8_PERIOD
#endif /* RE_ENABLE_I18N */
|| type == END_OF_RE)
{
memset (fastmap, '\1', sizeof (char) * SBC_MAX);
if (type == END_OF_RE)
bufp->can_be_null = 1;
return;
}
}
}
/* Entry point for POSIX code. */
/* regcomp takes a regular expression as a string and compiles it.
PREG is a regex_t *. We do not expect any fields to be initialized,
since POSIX says we shouldn't. Thus, we set
`buffer' to the compiled pattern;
`used' to the length of the compiled pattern;
`syntax' to RE_SYNTAX_POSIX_EXTENDED if the
REG_EXTENDED bit in CFLAGS is set; otherwise, to
RE_SYNTAX_POSIX_BASIC;
`newline_anchor' to REG_NEWLINE being set in CFLAGS;
`fastmap' to an allocated space for the fastmap;
`fastmap_accurate' to zero;
`re_nsub' to the number of subexpressions in PATTERN.
PATTERN is the address of the pattern string.
CFLAGS is a series of bits which affect compilation.
If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we
use POSIX basic syntax.
If REG_NEWLINE is set, then . and [^...] don't match newline.
Also, regexec will try a match beginning after every newline.
If REG_ICASE is set, then we considers upper- and lowercase
versions of letters to be equivalent when matching.
If REG_NOSUB is set, then when PREG is passed to regexec, that
routine will report only success or failure, and nothing about the
registers.
It returns 0 if it succeeds, nonzero if it doesn't. (See regex.h for
the return codes and their meanings.) */
int
regcomp (preg, pattern, cflags)
regex_t *__restrict preg;
const char *__restrict pattern;
int cflags;
{
reg_errcode_t ret;
reg_syntax_t syntax = ((cflags & REG_EXTENDED) ? RE_SYNTAX_POSIX_EXTENDED
: RE_SYNTAX_POSIX_BASIC);
preg->buffer = NULL;
preg->allocated = 0;
preg->used = 0;
/* Try to allocate space for the fastmap. */
preg->fastmap = re_malloc (char, SBC_MAX);
if (BE (preg->fastmap == NULL, 0))
return REG_ESPACE;
syntax |= (cflags & REG_ICASE) ? RE_ICASE : 0;
/* If REG_NEWLINE is set, newlines are treated differently. */
if (cflags & REG_NEWLINE)
{ /* REG_NEWLINE implies neither . nor [^...] match newline. */
syntax &= ~RE_DOT_NEWLINE;
syntax |= RE_HAT_LISTS_NOT_NEWLINE;
/* It also changes the matching behavior. */
preg->newline_anchor = 1;
}
else
preg->newline_anchor = 0;
preg->no_sub = !!(cflags & REG_NOSUB);
preg->translate = NULL;
ret = re_compile_internal (preg, pattern, strlen (pattern), syntax);
/* POSIX doesn't distinguish between an unmatched open-group and an
unmatched close-group: both are REG_EPAREN. */
if (ret == REG_ERPAREN)
ret = REG_EPAREN;
/* We have already checked preg->fastmap != NULL. */
if (BE (ret == REG_NOERROR, 1))
/* Compute the fastmap now, since regexec cannot modify the pattern
buffer. This function never fails in this implementation. */
(void) re_compile_fastmap (preg);
else
{
/* Some error occurred while compiling the expression. */
re_free (preg->fastmap);
preg->fastmap = NULL;
}
return (int) ret;
}
#ifdef _LIBC
weak_alias (__regcomp, regcomp)
#endif
/* Returns a message corresponding to an error code, ERRCODE, returned
from either regcomp or regexec. We don't use PREG here. */
size_t
regerror (errcode, preg, errbuf, errbuf_size)
int errcode;
const regex_t *__restrict preg;
char *__restrict errbuf;
size_t errbuf_size;
{
const char *msg;
size_t msg_size;
if (BE (errcode < 0
|| errcode >= (int) (sizeof (__re_error_msgid_idx)
/ sizeof (__re_error_msgid_idx[0])), 0))
/* Only error codes returned by the rest of the code should be passed
to this routine. If we are given anything else, or if other regex
code generates an invalid error code, then the program has a bug.
Dump core so we can fix it. */
abort ();
msg = gettext (__re_error_msgid + __re_error_msgid_idx[errcode]);
msg_size = strlen (msg) + 1; /* Includes the null. */
if (BE (errbuf_size != 0, 1))
{
if (BE (msg_size > errbuf_size, 0))
{
#if defined HAVE_MEMPCPY || defined _LIBC
*((char *) __mempcpy (errbuf, msg, errbuf_size - 1)) = '\0';
#else
memcpy (errbuf, msg, errbuf_size - 1);
errbuf[errbuf_size - 1] = 0;
#endif
}
else
memcpy (errbuf, msg, msg_size);
}
return msg_size;
}
#ifdef _LIBC
weak_alias (__regerror, regerror)
#endif
#ifdef RE_ENABLE_I18N
/* This static array is used for the map to single-byte characters when
UTF-8 is used. Otherwise we would allocate memory just to initialize
it the same all the time. UTF-8 is the preferred encoding so this is
a worthwhile optimization. */
static const bitset_t utf8_sb_map =
{
/* Set the first 128 bits. */
[0 ... 0x80 / BITSET_WORD_BITS - 1] = BITSET_WORD_MAX
};
#endif
static void
free_dfa_content (re_dfa_t *dfa)
{
int i, j;
if (dfa->nodes)
for (i = 0; i < dfa->nodes_len; ++i)
free_token (dfa->nodes + i);
re_free (dfa->nexts);
for (i = 0; i < dfa->nodes_len; ++i)
{
if (dfa->eclosures != NULL)
re_node_set_free (dfa->eclosures + i);
if (dfa->inveclosures != NULL)
re_node_set_free (dfa->inveclosures + i);
if (dfa->edests != NULL)
re_node_set_free (dfa->edests + i);
}
re_free (dfa->edests);
re_free (dfa->eclosures);
re_free (dfa->inveclosures);
re_free (dfa->nodes);
if (dfa->state_table)
for (i = 0; i <= dfa->state_hash_mask; ++i)
{
struct re_state_table_entry *entry = dfa->state_table + i;
for (j = 0; j < entry->num; ++j)
{
re_dfastate_t *state = entry->array[j];
free_state (state);
}
re_free (entry->array);
}
re_free (dfa->state_table);
#ifdef RE_ENABLE_I18N
if (dfa->sb_char != utf8_sb_map)
re_free (dfa->sb_char);
#endif
re_free (dfa->subexp_map);
#ifdef DEBUG
re_free (dfa->re_str);
#endif
re_free (dfa);
}
/* Free dynamically allocated space used by PREG. */
void
regfree (preg)
regex_t *preg;
{
re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
if (BE (dfa != NULL, 1))
free_dfa_content (dfa);
preg->buffer = NULL;
preg->allocated = 0;
re_free (preg->fastmap);
preg->fastmap = NULL;
re_free (preg->translate);
preg->translate = NULL;
}
#ifdef _LIBC
weak_alias (__regfree, regfree)
#endif
/* Entry points compatible with 4.2 BSD regex library. We don't define
them unless specifically requested. */
#if defined _REGEX_RE_COMP || defined _LIBC
/* BSD has one and only one pattern buffer. */
static struct re_pattern_buffer re_comp_buf;
char *
# ifdef _LIBC
/* Make these definitions weak in libc, so POSIX programs can redefine
these names if they don't use our functions, and still use
regcomp/regexec above without link errors. */
weak_function
# endif
re_comp (s)
const char *s;
{
reg_errcode_t ret;
char *fastmap;
if (!s)
{
if (!re_comp_buf.buffer)
return gettext ("No previous regular expression");
return 0;
}
if (re_comp_buf.buffer)
{
fastmap = re_comp_buf.fastmap;
re_comp_buf.fastmap = NULL;
__regfree (&re_comp_buf);
memset (&re_comp_buf, '\0', sizeof (re_comp_buf));
re_comp_buf.fastmap = fastmap;
}
if (re_comp_buf.fastmap == NULL)
{
re_comp_buf.fastmap = (char *) malloc (SBC_MAX);
if (re_comp_buf.fastmap == NULL)
return (char *) gettext (__re_error_msgid
+ __re_error_msgid_idx[(int) REG_ESPACE]);
}
/* Since `re_exec' always passes NULL for the `regs' argument, we
don't need to initialize the pattern buffer fields which affect it. */
/* Match anchors at newlines. */
re_comp_buf.newline_anchor = 1;
ret = re_compile_internal (&re_comp_buf, s, strlen (s), re_syntax_options);
if (!ret)
return NULL;
/* Yes, we're discarding `const' here if !HAVE_LIBINTL. */
return (char *) gettext (__re_error_msgid + __re_error_msgid_idx[(int) ret]);
}
#ifdef _LIBC
libc_freeres_fn (free_mem)
{
__regfree (&re_comp_buf);
}
#endif
#endif /* _REGEX_RE_COMP */
/* Internal entry point.
Compile the regular expression PATTERN, whose length is LENGTH.
SYNTAX indicate regular expression's syntax. */
static reg_errcode_t
re_compile_internal (regex_t *preg, const char * pattern, size_t length,
reg_syntax_t syntax)
{
reg_errcode_t err = REG_NOERROR;
re_dfa_t *dfa;
re_string_t regexp;
/* Initialize the pattern buffer. */
preg->fastmap_accurate = 0;
preg->syntax = syntax;
preg->not_bol = preg->not_eol = 0;
preg->used = 0;
preg->re_nsub = 0;
preg->can_be_null = 0;
preg->regs_allocated = REGS_UNALLOCATED;
/* Initialize the dfa. */
dfa = (re_dfa_t *) preg->buffer;
if (BE (preg->allocated < sizeof (re_dfa_t), 0))
{
/* If zero allocated, but buffer is non-null, try to realloc
enough space. This loses if buffer's address is bogus, but
that is the user's responsibility. If ->buffer is NULL this
is a simple allocation. */
dfa = re_realloc (preg->buffer, re_dfa_t, 1);
if (dfa == NULL)
return REG_ESPACE;
preg->allocated = sizeof (re_dfa_t);
preg->buffer = (unsigned char *) dfa;
}
preg->used = sizeof (re_dfa_t);
err = init_dfa (dfa, length);
if (BE (err != REG_NOERROR, 0))
{
free_dfa_content (dfa);
preg->buffer = NULL;
preg->allocated = 0;
return err;
}
#ifdef DEBUG
/* Note: length+1 will not overflow since it is checked in init_dfa. */
dfa->re_str = re_malloc (char, length + 1);
strncpy (dfa->re_str, pattern, length + 1);
#endif
__libc_lock_init (dfa->lock);
err = re_string_construct (®exp, pattern, length, preg->translate,
syntax & RE_ICASE, dfa);
if (BE (err != REG_NOERROR, 0))
{
re_compile_internal_free_return:
free_workarea_compile (preg);
re_string_destruct (®exp);
free_dfa_content (dfa);
preg->buffer = NULL;
preg->allocated = 0;
return err;
}
/* Parse the regular expression, and build a structure tree. */
preg->re_nsub = 0;
dfa->str_tree = parse (®exp, preg, syntax, &err);
if (BE (dfa->str_tree == NULL, 0))
goto re_compile_internal_free_return;
/* Analyze the tree and create the nfa. */
err = analyze (preg);
if (BE (err != REG_NOERROR, 0))
goto re_compile_internal_free_return;
#ifdef RE_ENABLE_I18N
/* If possible, do searching in single byte encoding to speed things up. */
if (dfa->is_utf8 && !(syntax & RE_ICASE) && preg->translate == NULL)
optimize_utf8 (dfa);
#endif
/* Then create the initial state of the dfa. */
err = create_initial_state (dfa);
/* Release work areas. */
free_workarea_compile (preg);
re_string_destruct (®exp);
if (BE (err != REG_NOERROR, 0))
{
free_dfa_content (dfa);
preg->buffer = NULL;
preg->allocated = 0;
}
return err;
}
/* Initialize DFA. We use the length of the regular expression PAT_LEN
as the initial length of some arrays. */
static reg_errcode_t
init_dfa (re_dfa_t *dfa, size_t pat_len)
{
unsigned int table_size;
#ifndef _LIBC
char *codeset_name;
#endif
memset (dfa, '\0', sizeof (re_dfa_t));
/* Force allocation of str_tree_storage the first time. */
dfa->str_tree_storage_idx = BIN_TREE_STORAGE_SIZE;
/* Avoid overflows. */
if (pat_len == SIZE_MAX)
return REG_ESPACE;
dfa->nodes_alloc = pat_len + 1;
dfa->nodes = re_malloc (re_token_t, dfa->nodes_alloc);
/* table_size = 2 ^ ceil(log pat_len) */
for (table_size = 1; ; table_size <<= 1)
if (table_size > pat_len)
break;
dfa->state_table = calloc (sizeof (struct re_state_table_entry), table_size);
dfa->state_hash_mask = table_size - 1;
dfa->mb_cur_max = MB_CUR_MAX;
#ifdef _LIBC
if (dfa->mb_cur_max == 6
&& strcmp (_NL_CURRENT (LC_CTYPE, _NL_CTYPE_CODESET_NAME), "UTF-8") == 0)
dfa->is_utf8 = 1;
dfa->map_notascii = (_NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_MAP_TO_NONASCII)
!= 0);
#else
# ifdef HAVE_LANGINFO_CODESET
codeset_name = nl_langinfo (CODESET);
# else
codeset_name = getenv ("LC_ALL");
if (codeset_name == NULL || codeset_name[0] == '\0')
codeset_name = getenv ("LC_CTYPE");
if (codeset_name == NULL || codeset_name[0] == '\0')
codeset_name = getenv ("LANG");
if (codeset_name == NULL)
codeset_name = "";
else if (strchr (codeset_name, '.') != NULL)
codeset_name = strchr (codeset_name, '.') + 1;
# endif
if (strcasecmp (codeset_name, "UTF-8") == 0
|| strcasecmp (codeset_name, "UTF8") == 0)
dfa->is_utf8 = 1;
/* We check exhaustively in the loop below if this charset is a
superset of ASCII. */
dfa->map_notascii = 0;
#endif
#ifdef RE_ENABLE_I18N
if (dfa->mb_cur_max > 1)
{
if (dfa->is_utf8)
dfa->sb_char = (re_bitset_ptr_t) utf8_sb_map;
else
{
int i, j, ch;
dfa->sb_char = (re_bitset_ptr_t) calloc (sizeof (bitset_t), 1);
if (BE (dfa->sb_char == NULL, 0))
return REG_ESPACE;
/* Set the bits corresponding to single byte chars. */
for (i = 0, ch = 0; i < BITSET_WORDS; ++i)
for (j = 0; j < BITSET_WORD_BITS; ++j, ++ch)
{
wint_t wch = __btowc (ch);
if (wch != WEOF)
dfa->sb_char[i] |= (bitset_word_t) 1 << j;
# ifndef _LIBC
if (isascii (ch) && wch != ch)
dfa->map_notascii = 1;
# endif
}
}
}
#endif
if (BE (dfa->nodes == NULL || dfa->state_table == NULL, 0))
return REG_ESPACE;
return REG_NOERROR;
}
/* Initialize WORD_CHAR table, which indicate which character is
"word". In this case "word" means that it is the word construction
character used by some operators like "\<", "\>", etc. */
static void
internal_function
init_word_char (re_dfa_t *dfa)
{
int i, j, ch;
dfa->word_ops_used = 1;
for (i = 0, ch = 0; i < BITSET_WORDS; ++i)
for (j = 0; j < BITSET_WORD_BITS; ++j, ++ch)
if (isalnum (ch) || ch == '_')
dfa->word_char[i] |= (bitset_word_t) 1 << j;
}
/* Free the work area which are only used while compiling. */
static void
free_workarea_compile (regex_t *preg)
{
re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
bin_tree_storage_t *storage, *next;
for (storage = dfa->str_tree_storage; storage; storage = next)
{
next = storage->next;
re_free (storage);
}
dfa->str_tree_storage = NULL;
dfa->str_tree_storage_idx = BIN_TREE_STORAGE_SIZE;
dfa->str_tree = NULL;
re_free (dfa->org_indices);
dfa->org_indices = NULL;
}
/* Create initial states for all contexts. */
static reg_errcode_t
create_initial_state (re_dfa_t *dfa)
{
int first, i;
reg_errcode_t err;
re_node_set init_nodes;
/* Initial states have the epsilon closure of the node which is
the first node of the regular expression. */
first = dfa->str_tree->first->node_idx;
dfa->init_node = first;
err = re_node_set_init_copy (&init_nodes, dfa->eclosures + first);
if (BE (err != REG_NOERROR, 0))
return err;
/* The back-references which are in initial states can epsilon transit,
since in this case all of the subexpressions can be null.
Then we add epsilon closures of the nodes which are the next nodes of
the back-references. */
if (dfa->nbackref > 0)
for (i = 0; i < init_nodes.nelem; ++i)
{
int node_idx = init_nodes.elems[i];
re_token_type_t type = dfa->nodes[node_idx].type;
int clexp_idx;
if (type != OP_BACK_REF)
continue;
for (clexp_idx = 0; clexp_idx < init_nodes.nelem; ++clexp_idx)
{
re_token_t *clexp_node;
clexp_node = dfa->nodes + init_nodes.elems[clexp_idx];
if (clexp_node->type == OP_CLOSE_SUBEXP
&& clexp_node->opr.idx == dfa->nodes[node_idx].opr.idx)
break;
}
if (clexp_idx == init_nodes.nelem)
continue;
if (type == OP_BACK_REF)
{
int dest_idx = dfa->edests[node_idx].elems[0];
if (!re_node_set_contains (&init_nodes, dest_idx))
{
re_node_set_merge (&init_nodes, dfa->eclosures + dest_idx);
i = 0;
}
}
}
/* It must be the first time to invoke acquire_state. */
dfa->init_state = re_acquire_state_context (&err, dfa, &init_nodes, 0);
/* We don't check ERR here, since the initial state must not be NULL. */
if (BE (dfa->init_state == NULL, 0))
return err;
if (dfa->init_state->has_constraint)
{
dfa->init_state_word = re_acquire_state_context (&err, dfa, &init_nodes,
CONTEXT_WORD);
dfa->init_state_nl = re_acquire_state_context (&err, dfa, &init_nodes,
CONTEXT_NEWLINE);
dfa->init_state_begbuf = re_acquire_state_context (&err, dfa,
&init_nodes,