regex_internal.h

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/* Extended regular expression matching and search library.
   Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Isamu Hasegawa <[e-mail]>.

   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.  */

#ifndef _REGEX_INTERNAL_H
#define _REGEX_INTERNAL_H 1

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#if defined HAVE_LOCALE_H || defined _LIBC
# include <locale.h>
#endif
#if defined HAVE_WCHAR_H || defined _LIBC
# include <wchar.h>
#endif /* HAVE_WCHAR_H || _LIBC */
#if defined HAVE_WCTYPE_H || defined _LIBC
# include <wctype.h>
#endif /* HAVE_WCTYPE_H || _LIBC */

/* In case that the system doesn't have isblank().  */
#if !defined _LIBC && !defined HAVE_ISBLANK && !defined isblank
# define isblank(ch) ((ch) == ' ' || (ch) == '\t')
#endif

#ifdef _LIBC
# ifndef _RE_DEFINE_LOCALE_FUNCTIONS
#  define _RE_DEFINE_LOCALE_FUNCTIONS 1
#   include <locale/localeinfo.h>
#   include <locale/elem-hash.h>
#   include <locale/coll-lookup.h>
# endif
#endif

/* This is for other GNU distributions with internationalized messages.  */
#if HAVE_LIBINTL_H || defined _LIBC
# include <libintl.h>
# ifdef _LIBC
#  undef gettext
#  define gettext(msgid) \
  INTUSE(__dcgettext) (INTUSE(_libc_intl_domainname), msgid, LC_MESSAGES)
# endif
#else
# define gettext(msgid) (msgid)
#endif

#ifndef gettext_noop
/* This define is so xgettext can find the internationalizable
   strings.  */
# define gettext_noop(String) String
#endif

#if (defined MB_CUR_MAX && HAVE_LOCALE_H && HAVE_WCTYPE_H && HAVE_WCHAR_H && HAVE_WCRTOMB && HAVE_MBRTOWC && HAVE_WCSCOLL) || _LIBC
# define RE_ENABLE_I18N
#endif

#if __GNUC__ >= 3
# define BE(expr, val) __builtin_expect (expr, val)
#else
# define BE(expr, val) (expr)
# define inline
#endif

/* Number of bits in a byte.  */
#define BYTE_BITS 8
/* Number of single byte character.  */
#define SBC_MAX 256

#define COLL_ELEM_LEN_MAX 8

/* The character which represents newline.  */
#define NEWLINE_CHAR '\n'
#define WIDE_NEWLINE_CHAR L'\n'

/* Rename to standard API for using out of glibc.  */
#ifndef _LIBC
# define __wctype wctype
# define __iswctype iswctype
# define __btowc btowc
# define __mempcpy mempcpy
# define __wcrtomb wcrtomb
# define attribute_hidden
#endif /* not _LIBC */

extern const char __re_error_msgid[] attribute_hidden;
extern const size_t __re_error_msgid_idx[] attribute_hidden;

/* Number of bits in an unsinged int.  */
#define UINT_BITS (sizeof (unsigned int) * BYTE_BITS)
/* Number of unsigned int in an bit_set.  */
#define BITSET_UINTS ((SBC_MAX + UINT_BITS - 1) / UINT_BITS)
typedef unsigned int bitset[BITSET_UINTS];
typedef unsigned int *re_bitset_ptr_t;

#define bitset_set(set,i) (set[i / UINT_BITS] |= 1 << i % UINT_BITS)
#define bitset_clear(set,i) (set[i / UINT_BITS] &= ~(1 << i % UINT_BITS))
#define bitset_contain(set,i) (set[i / UINT_BITS] & (1 << i % UINT_BITS))
#define bitset_empty(set) memset (set, 0, sizeof (unsigned int) * BITSET_UINTS)
#define bitset_set_all(set) \
  memset (set, 255, sizeof (unsigned int) * BITSET_UINTS)
#define bitset_copy(dest,src) \
  memcpy (dest, src, sizeof (unsigned int) * BITSET_UINTS)
static inline void bitset_not (bitset set);
static inline void bitset_merge (bitset dest, const bitset src);
static inline void bitset_not_merge (bitset dest, const bitset src);

#define PREV_WORD_CONSTRAINT 0x0001
#define PREV_NOTWORD_CONSTRAINT 0x0002
#define NEXT_WORD_CONSTRAINT 0x0004
#define NEXT_NOTWORD_CONSTRAINT 0x0008
#define PREV_NEWLINE_CONSTRAINT 0x0010
#define NEXT_NEWLINE_CONSTRAINT 0x0020
#define PREV_BEGBUF_CONSTRAINT 0x0040
#define NEXT_ENDBUF_CONSTRAINT 0x0080
#define DUMMY_CONSTRAINT 0x0100

typedef enum
{
  INSIDE_WORD = PREV_WORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
  WORD_FIRST = PREV_NOTWORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
  WORD_LAST = PREV_WORD_CONSTRAINT | NEXT_NOTWORD_CONSTRAINT,
  LINE_FIRST = PREV_NEWLINE_CONSTRAINT,
  LINE_LAST = NEXT_NEWLINE_CONSTRAINT,
  BUF_FIRST = PREV_BEGBUF_CONSTRAINT,
  BUF_LAST = NEXT_ENDBUF_CONSTRAINT,
  WORD_DELIM = DUMMY_CONSTRAINT
} re_context_type;

typedef struct
{
  int alloc;
  int nelem;
  int *elems;
} re_node_set;

typedef enum
{
  NON_TYPE = 0,

  /* Token type, these are used only by token.  */
  OP_OPEN_BRACKET,
  OP_CLOSE_BRACKET,
  OP_CHARSET_RANGE,
  OP_OPEN_DUP_NUM,
  OP_CLOSE_DUP_NUM,
  OP_NON_MATCH_LIST,
  OP_OPEN_COLL_ELEM,
  OP_CLOSE_COLL_ELEM,
  OP_OPEN_EQUIV_CLASS,
  OP_CLOSE_EQUIV_CLASS,
  OP_OPEN_CHAR_CLASS,
  OP_CLOSE_CHAR_CLASS,
  OP_WORD,
  OP_NOTWORD,
  BACK_SLASH,

  /* Tree type, these are used only by tree. */
  CONCAT,
  ALT,
  SUBEXP,
  SIMPLE_BRACKET,
#ifdef RE_ENABLE_I18N
  COMPLEX_BRACKET,
#endif /* RE_ENABLE_I18N */

  /* Node type, These are used by token, node, tree.  */
  OP_OPEN_SUBEXP,
  OP_CLOSE_SUBEXP,
  OP_PERIOD,
  CHARACTER,
  END_OF_RE,
  OP_ALT,
  OP_DUP_ASTERISK,
  OP_DUP_PLUS,
  OP_DUP_QUESTION,
  OP_BACK_REF,
  ANCHOR,

  /* Dummy marker.  */
  END_OF_RE_TOKEN_T
} re_token_type_t;

#ifdef RE_ENABLE_I18N
typedef struct
{
  /* Multibyte characters.  */
  wchar_t *mbchars;

  /* Collating symbols.  */
# ifdef _LIBC
  int32_t *coll_syms;
# endif

  /* Equivalence classes. */
# ifdef _LIBC
  int32_t *equiv_classes;
# endif

  /* Range expressions. */
# ifdef _LIBC
  uint32_t *range_starts;
  uint32_t *range_ends;
# else /* not _LIBC */
  wchar_t *range_starts;
  wchar_t *range_ends;
# endif /* not _LIBC */

  /* Character classes. */
  wctype_t *char_classes;

  /* If this character set is the non-matching list.  */
  unsigned int non_match : 1;

  /* # of multibyte characters.  */
  int nmbchars;

  /* # of collating symbols.  */
  int ncoll_syms;

  /* # of equivalence classes. */
  int nequiv_classes;

  /* # of range expressions. */
  int nranges;

  /* # of character classes. */
  int nchar_classes;
} re_charset_t;
#endif /* RE_ENABLE_I18N */

typedef struct
{
  union
  {
    unsigned char c;		/* for CHARACTER */
    re_bitset_ptr_t sbcset;	/* for SIMPLE_BRACKET */
#ifdef RE_ENABLE_I18N
    re_charset_t *mbcset;	/* for COMPLEX_BRACKET */
#endif /* RE_ENABLE_I18N */
    int idx;			/* for BACK_REF */
    re_context_type ctx_type;	/* for ANCHOR */
  } opr;
#if __GNUC__ >= 2
  re_token_type_t type : 8;
#else
  re_token_type_t type;
#endif
  unsigned int constraint : 10;	/* context constraint */
  unsigned int duplicated : 1;
#ifdef RE_ENABLE_I18N
  unsigned int mb_partial : 1;
#endif
} re_token_t;

#define IS_EPSILON_NODE(type) \
  ((type) == OP_ALT || (type) == OP_DUP_ASTERISK || (type) == OP_DUP_PLUS \
   || (type) == OP_DUP_QUESTION || (type) == ANCHOR \
   || (type) == OP_OPEN_SUBEXP || (type) == OP_CLOSE_SUBEXP)

#define ACCEPT_MB_NODE(type) \
  ((type) == COMPLEX_BRACKET || (type) == OP_PERIOD)

struct re_string_t
{
  /* Indicate the raw buffer which is the original string passed as an
     argument of regexec(), re_search(), etc..  */
  const unsigned char *raw_mbs;
  /* Store the multibyte string.  In case of "case insensitive mode" like
     REG_ICASE, upper cases of the string are stored, otherwise MBS points
     the same address that RAW_MBS points.  */
  unsigned char *mbs;
  /* Store the case sensitive multibyte string.  In case of
     "case insensitive mode", the original string are stored,
     otherwise MBS_CASE points the same address that MBS points.  */
  unsigned char *mbs_case;
#ifdef RE_ENABLE_I18N
  /* Store the wide character string which is corresponding to MBS.  */
  wint_t *wcs;
  mbstate_t cur_state;
#endif
  /* Index in RAW_MBS.  Each character mbs[i] corresponds to
     raw_mbs[raw_mbs_idx + i].  */
  int raw_mbs_idx;
  /* The length of the valid characters in the buffers.  */
  int valid_len;
  /* The length of the buffers MBS, MBS_CASE, and WCS.  */
  int bufs_len;
  /* The index in MBS, which is updated by re_string_fetch_byte.  */
  int cur_idx;
  /* This is length_of_RAW_MBS - RAW_MBS_IDX.  */
  int len;
  /* End of the buffer may be shorter than its length in the cases such
     as re_match_2, re_search_2.  Then, we use STOP for end of the buffer
     instead of LEN.  */
  int stop;

  /* The context of mbs[0].  We store the context independently, since
     the context of mbs[0] may be different from raw_mbs[0], which is
     the beginning of the input string.  */
  unsigned int tip_context;
  /* The translation passed as a part of an argument of re_compile_pattern.  */
  RE_TRANSLATE_TYPE trans;
  /* 1 if REG_ICASE.  */
  unsigned int icase : 1;
};
typedef struct re_string_t re_string_t;
/* In case of REG_ICASE, we allocate the buffer dynamically for mbs.  */
#define MBS_ALLOCATED(pstr) (pstr->icase)
/* In case that we need translation, we allocate the buffer dynamically
   for mbs_case.  Note that mbs == mbs_case if not REG_ICASE.  */
#define MBS_CASE_ALLOCATED(pstr) (pstr->trans != NULL)


static reg_errcode_t re_string_allocate (re_string_t *pstr, const char *str,
					 int len, int init_len,
					 RE_TRANSLATE_TYPE trans, int icase);
static reg_errcode_t re_string_construct (re_string_t *pstr, const char *str,
					  int len, RE_TRANSLATE_TYPE trans,
					  int icase);
static reg_errcode_t re_string_reconstruct (re_string_t *pstr, int idx,
					    int eflags, int newline);
static reg_errcode_t re_string_realloc_buffers (re_string_t *pstr,
						int new_buf_len);
#ifdef RE_ENABLE_I18N
static void build_wcs_buffer (re_string_t *pstr);
static void build_wcs_upper_buffer (re_string_t *pstr);
#endif /* RE_ENABLE_I18N */
static void build_upper_buffer (re_string_t *pstr);
static void re_string_translate_buffer (re_string_t *pstr);
static void re_string_destruct (re_string_t *pstr);
#ifdef RE_ENABLE_I18N
static int re_string_elem_size_at (const re_string_t *pstr, int idx);
static inline int re_string_char_size_at (const re_string_t *pstr, int idx);
static inline wint_t re_string_wchar_at (const re_string_t *pstr, int idx);
#endif /* RE_ENABLE_I18N */
static unsigned int re_string_context_at (const re_string_t *input, int idx,
					  int eflags, int newline_anchor);
#define re_string_peek_byte(pstr, offset) \
  ((pstr)->mbs[(pstr)->cur_idx + offset])
#define re_string_peek_byte_case(pstr, offset) \
  ((pstr)->mbs_case[(pstr)->cur_idx + offset])
#define re_string_fetch_byte(pstr) \
  ((pstr)->mbs[(pstr)->cur_idx++])
#define re_string_fetch_byte_case(pstr) \
  ((pstr)->mbs_case[(pstr)->cur_idx++])
#define re_string_first_byte(pstr, idx) \
  ((idx) == (pstr)->len || (pstr)->wcs[idx] != WEOF)
#define re_string_is_single_byte_char(pstr, idx) \