/* Extended regular expression matching and search library. Copyright (C) 2002, 2003, 2004, 2005 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. */ #ifndef _REGEX_INTERNAL_H #define _REGEX_INTERNAL_H 1 #include <assert.h> #include <ctype.h> #include <stdlib.h> #include <string.h> #if defined HAVE_LANGINFO_H || defined HAVE_LANGINFO_CODESET # include <langinfo.h> #endif #if defined HAVE_LOCALE_H # include <locale.h> #endif #if defined HAVE_WCHAR_H # include <wchar.h> #endif #if defined HAVE_WCTYPE_H # include <wctype.h> #endif #if defined HAVE_STDBOOL_H # include <stdbool.h> #endif #if defined HAVE_STDINT_H # include <stdint.h> #endif #ifdef __UCLIBC_HAS_THREADS__ #include <bits/libc-lock.h> #else #define __libc_lock_define(CLASS, NAME) #define __libc_lock_init(NAME) do { } while (0) #define __libc_lock_lock(NAME) do { } while (0) #define __libc_lock_unlock(NAME) do { } while (0) #endif #undef gettext #undef gettext_noop #define gettext(msgid) (msgid) #define gettext_noop(String) String #if (defined MB_CUR_MAX && HAVE_LOCALE_H && HAVE_WCTYPE_H && HAVE_WCHAR_H && HAVE_WCRTOMB && HAVE_MBRTOWC && HAVE_WCSCOLL) # define RE_ENABLE_I18N #endif #if __GNUC__ >= 3 /* uclibc: lean towards smaller size a bit: * OFF: # define BE(expr, val) __builtin_expect (expr, val) */ # define BE(expr, val) (expr) #else # define BE(expr, val) (expr) # define inline #endif /* 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' #ifdef __GNUC__ # define __attribute(arg) __attribute__ (arg) #else # define __attribute(arg) #endif /* An integer used to represent a set of bits. It must be unsigned, and must be at least as wide as unsigned int. */ typedef unsigned long int bitset_word_t; /* All bits set in a bitset_word_t. */ #define BITSET_WORD_MAX ULONG_MAX /* Number of bits in a bitset_word_t. */ #define BITSET_WORD_BITS (sizeof (bitset_word_t) * CHAR_BIT) /* Number of bitset_word_t in a bit_set. */ #define BITSET_WORDS (SBC_MAX / BITSET_WORD_BITS) typedef bitset_word_t bitset_t[BITSET_WORDS]; typedef bitset_word_t *re_bitset_ptr_t; typedef const bitset_word_t *re_const_bitset_ptr_t; #define bitset_set(set,i) \ (set[i / BITSET_WORD_BITS] |= (bitset_word_t) 1 << i % BITSET_WORD_BITS) #define bitset_clear(set,i) \ (set[i / BITSET_WORD_BITS] &= ~((bitset_word_t) 1 << i % BITSET_WORD_BITS)) #define bitset_contain(set,i) \ (set[i / BITSET_WORD_BITS] & ((bitset_word_t) 1 << i % BITSET_WORD_BITS)) #define bitset_empty(set) memset (set, '\0', sizeof (bitset_t)) #define bitset_set_all(set) memset (set, '\xff', sizeof (bitset_t)) #define bitset_copy(dest,src) memcpy (dest, src, sizeof (bitset_t)) #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 WORD_DELIM_CONSTRAINT 0x0100 #define NOT_WORD_DELIM_CONSTRAINT 0x0200 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, INSIDE_NOTWORD = PREV_NOTWORD_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 = WORD_DELIM_CONSTRAINT, NOT_WORD_DELIM = NOT_WORD_DELIM_CONSTRAINT } re_context_type; typedef struct { int alloc; int nelem; int *elems; } re_node_set; typedef enum { NON_TYPE = 0, /* Node type, These are used by token, node, tree. */ CHARACTER = 1, END_OF_RE = 2, SIMPLE_BRACKET = 3, OP_BACK_REF = 4, OP_PERIOD = 5, #ifdef RE_ENABLE_I18N COMPLEX_BRACKET = 6, OP_UTF8_PERIOD = 7, #endif /* RE_ENABLE_I18N */ /* We define EPSILON_BIT as a macro so that OP_OPEN_SUBEXP is used when the debugger shows values of this enum type. */ #define EPSILON_BIT 8 OP_OPEN_SUBEXP = EPSILON_BIT | 0, OP_CLOSE_SUBEXP = EPSILON_BIT | 1, OP_ALT = EPSILON_BIT | 2, OP_DUP_ASTERISK = EPSILON_BIT | 3, ANCHOR = EPSILON_BIT | 4, /* Tree type, these are used only by tree. */ CONCAT = 16, SUBEXP = 17, /* Token type, these are used only by token. */ OP_DUP_PLUS = 18, OP_DUP_QUESTION, 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, OP_SPACE, OP_NOTSPACE, BACK_SLASH } re_token_type_t; #ifdef RE_ENABLE_I18N typedef struct { /* Multibyte characters. */ wchar_t *mbchars; /* Collating symbols. */ # if 0 int32_t *coll_syms; # endif /* Equivalence classes. */ # if 0 int32_t *equiv_classes; # endif /* Range expressions. */ # if 0 uint32_t *range_starts; uint32_t *range_ends; # else wchar_t *range_starts; wchar_t *range_ends; # endif /* 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; unsigned int opt_subexp : 1; #ifdef RE_ENABLE_I18N unsigned int accept_mb : 1; /* These 2 bits can be moved into the union if needed (e.g. if running out of bits; move opr.c to opr.c.c and move the flags to opr.c.flags). */ unsigned int mb_partial : 1; #endif unsigned int word_char : 1; } re_token_t; #define IS_EPSILON_NODE(type) ((type) & EPSILON_BIT) 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; #ifdef RE_ENABLE_I18N /* Store the wide character string which is corresponding to MBS. */ wint_t *wcs; int *offsets; 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 corresponding number of bytes in raw_mbs array. */ int valid_raw_len; /* The length of the buffers MBS and WCS. */ int bufs_len; /* The index in MBS, which is updated by re_string_fetch_byte. */ int cur_idx; /* length of RAW_MBS array. */ int raw_len; /* This is RAW_LEN - RAW_MBS_IDX + VALID_LEN - VALID_RAW_LEN. */ 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 raw_stop; /* This is RAW_STOP - RAW_MBS_IDX adjusted through OFFSETS. */ 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; /* Copy of re_dfa_t's word_char. */ re_const_bitset_ptr_t word_char; /* 1 if REG_ICASE. */ unsigned char icase; unsigned char is_utf8; unsigned char map_notascii; unsigned char mbs_allocated; unsigned char offsets_needed; unsigned char newline_anchor; unsigned char word_ops_used; int mb_cur_max; }; typedef struct re_string_t re_string_t; struct re_dfa_t; typedef struct re_dfa_t re_dfa_t; static reg_errcode_t re_string_realloc_buffers (re_string_t *pstr, int new_buf_len) internal_function; #ifdef RE_ENABLE_I18N static void build_wcs_buffer (re_string_t *pstr) internal_function; static reg_errcode_t build_wcs_upper_buffer (re_string_t *pstr) internal_function; #endif /* RE_ENABLE_I18N */ static void build_upper_buffer (re_string_t *pstr) internal_function; static void re_string_translate_buffer (re_string_t *pstr) internal_function; static unsigned int re_string_context_at (const re_string_t *input, int idx, int eflags) internal_function __attribute ((pure)); #define re_string_peek_byte(pstr, offset) \ ((pstr)->mbs[(pstr)->cur_idx + offset]) #define re_string_fetch_byte(pstr) \ ((pstr)->mbs[(pstr)->cur_idx++]) #define re_string_first_byte(pstr, idx) \ ((idx) == (pstr)->valid_len || (pstr)->wcs[idx] != WEOF) #define re_string_is_single_byte_char(pstr, idx) \ ((pstr)->wcs[idx] != WEOF && ((pstr)->valid_len == (idx) + 1 \ || (pstr)->wcs[(idx) + 1] != WEOF)) #define re_string_eoi(pstr) ((pstr)->stop <= (pstr)->cur_idx) #define re_string_cur_idx(pstr) ((pstr)->cur_idx) #define re_string_get_buffer(pstr) ((pstr)->mbs) #define re_string_length(pstr) ((pstr)->len) #define re_string_byte_at(pstr,idx) ((pstr)->mbs[idx]) #define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx)) #define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx)) #include <alloca.h> #if 1 # ifdef HAVE_ALLOCA /* The OS usually guarantees only one guard page at the bottom of the stack, and a page size can be as small as 4096 bytes. So we cannot safely allocate anything larger than 4096 bytes. Also care for the possibility of a few compiler-allocated temporary stack slots. */ # define __libc_use_alloca(n) ((n) < 4032) # else /* alloca is implemented with malloc, so just use malloc. */ # define __libc_use_alloca(n) 0 # endif #endif #define re_malloc(t,n) ((t *) malloc ((n) * sizeof (t))) #define re_realloc(p,t,n) ((t *) realloc (p, (n) * sizeof (t))) #define re_free(p) free (p) struct bin_tree_t { struct bin_tree_t *parent; struct bin_tree_t *left; struct bin_tree_t *right; struct bin_tree_t *first; struct bin_tree_t *next; re_token_t token; /* `node_idx' is the index in dfa->nodes, if `type' == 0. Otherwise `type' indicate the type of this node. */ int node_idx; }; typedef struct bin_tree_t bin_tree_t; #define BIN_TREE_STORAGE_SIZE \ ((1024 - sizeof (void *)) / sizeof (bin_tree_t)) struct bin_tree_storage_t { struct bin_tree_storage_t *next; bin_tree_t data[BIN_TREE_STORAGE_SIZE]; }; typedef struct bin_tree_storage_t bin_tree_storage_t; #define CONTEXT_WORD 1 #define CONTEXT_NEWLINE (CONTEXT_WORD << 1) #define CONTEXT_BEGBUF (CONTEXT_NEWLINE << 1) #define CONTEXT_ENDBUF (CONTEXT_BEGBUF << 1) #define IS_WORD_CONTEXT(c) ((c) & CONTEXT_WORD) #define IS_NEWLINE_CONTEXT(c) ((c) & CONTEXT_NEWLINE) #define IS_BEGBUF_CONTEXT(c) ((c) & CONTEXT_BEGBUF) #define IS_ENDBUF_CONTEXT(c) ((c) & CONTEXT_ENDBUF) #define IS_ORDINARY_CONTEXT(c) ((c) == 0) #define IS_WORD_CHAR(ch) (isalnum (ch) || (ch) == '_') #define IS_NEWLINE(ch) ((ch) == NEWLINE_CHAR) #define IS_WIDE_WORD_CHAR(ch) (iswalnum (ch) || (ch) == L'_') #define IS_WIDE_NEWLINE(ch) ((ch) == WIDE_NEWLINE_CHAR) #define NOT_SATISFY_PREV_CONSTRAINT(constraint,context) \ ((((constraint) & PREV_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \ || ((constraint & PREV_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \ || ((constraint & PREV_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context))\ || ((constraint & PREV_BEGBUF_CONSTRAINT) && !IS_BEGBUF_CONTEXT (context))) #define NOT_SATISFY_NEXT_CONSTRAINT(constraint,context) \ ((((constraint) & NEXT_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \ || (((constraint) & NEXT_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \ || (((constraint) & NEXT_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context)) \ || (((constraint) & NEXT_ENDBUF_CONSTRAINT) && !IS_ENDBUF_CONTEXT (context))) struct re_dfastate_t { unsigned int hash; re_node_set nodes; re_node_set non_eps_nodes; re_node_set inveclosure; re_node_set *entrance_nodes; struct re_dfastate_t **trtable, **word_trtable; unsigned int context : 4; unsigned int halt : 1; /* If this state can accept `multi byte'. Note that we refer to multibyte characters, and multi character collating elements as `multi byte'. */ unsigned int accept_mb : 1; /* If this state has backreference node(s). */ unsigned int has_backref : 1; unsigned int has_constraint : 1; }; typedef struct re_dfastate_t re_dfastate_t; struct re_state_table_entry { int num; int alloc; re_dfastate_t **array; }; /* Array type used in re_sub_match_last_t and re_sub_match_top_t. */ typedef struct { int next_idx; int alloc; re_dfastate_t **array; } state_array_t; /* Store information about the node NODE whose type is OP_CLOSE_SUBEXP. */ typedef struct { int node; int str_idx; /* The position NODE match at. */ state_array_t path; } re_sub_match_last_t; /* Store information about the node NODE whose type is OP_OPEN_SUBEXP. And information about the node, whose type is OP_CLOSE_SUBEXP, corresponding to NODE is stored in LASTS. */ typedef struct { int str_idx; int node; state_array_t *path; int alasts; /* Allocation size of LASTS. */ int nlasts; /* The number of LASTS. */ re_sub_match_last_t **lasts; } re_sub_match_top_t; struct re_backref_cache_entry { int node; int str_idx; int subexp_from; int subexp_to; char more; char unused; unsigned short int eps_reachable_subexps_map; }; typedef struct { /* The string object corresponding to the input string. */ re_string_t input; const re_dfa_t *dfa; /* EFLAGS of the argument of regexec. */ int eflags; /* Where the matching ends. */ int match_last; int last_node; /* The state log used by the matcher. */ re_dfastate_t **state_log; int state_log_top; /* Back reference cache. */ int nbkref_ents; int abkref_ents; struct re_backref_cache_entry *bkref_ents; int max_mb_elem_len; int nsub_tops; int asub_tops; re_sub_match_top_t **sub_tops; } re_match_context_t; typedef struct { re_dfastate_t **sifted_states; re_dfastate_t **limited_states; int last_node; int last_str_idx; re_node_set limits; } re_sift_context_t; struct re_fail_stack_ent_t { int idx; int node; regmatch_t *regs; re_node_set eps_via_nodes; }; struct re_fail_stack_t { int num; int alloc; struct re_fail_stack_ent_t *stack; }; struct re_dfa_t { re_token_t *nodes; size_t nodes_alloc; size_t nodes_len; int *nexts; int *org_indices; re_node_set *edests; re_node_set *eclosures; re_node_set *inveclosures; struct re_state_table_entry *state_table; re_dfastate_t *init_state; re_dfastate_t *init_state_word; re_dfastate_t *init_state_nl; re_dfastate_t *init_state_begbuf; bin_tree_t *str_tree; bin_tree_storage_t *str_tree_storage; re_bitset_ptr_t sb_char; int str_tree_storage_idx; /* number of subexpressions `re_nsub' is in regex_t. */ unsigned int state_hash_mask; int init_node; int nbackref; /* The number of backreference in this dfa. */ /* Bitmap expressing which backreference is used. */ bitset_word_t used_bkref_map; bitset_word_t completed_bkref_map; unsigned int has_plural_match : 1; /* If this dfa has "multibyte node", which is a backreference or a node which can accept multibyte character or multi character collating element. */ unsigned int has_mb_node : 1; unsigned int is_utf8 : 1; unsigned int map_notascii : 1; unsigned int word_ops_used : 1; int mb_cur_max; bitset_t word_char; reg_syntax_t syntax; int *subexp_map; #ifdef DEBUG char* re_str; #endif __libc_lock_define (, lock) }; #define re_node_set_init_empty(set) memset (set, '\0', sizeof (re_node_set)) #define re_node_set_remove(set,id) \ (re_node_set_remove_at (set, re_node_set_contains (set, id) - 1)) #define re_node_set_empty(p) ((p)->nelem = 0) #define re_node_set_free(set) re_free ((set)->elems) typedef enum { SB_CHAR, MB_CHAR, EQUIV_CLASS, COLL_SYM, CHAR_CLASS } bracket_elem_type; typedef struct { bracket_elem_type type; union { unsigned char ch; unsigned char *name; #ifdef __UCLIBC_HAS_WCHAR__ wchar_t wch; #endif } opr; } bracket_elem_t; /* Inline functions for bitset operation. */ static __inline__ void bitset_not (bitset_t set) { int bitset_i; for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i) set[bitset_i] = ~set[bitset_i]; } static __inline__ void bitset_merge (bitset_t dest, const bitset_t src) { int bitset_i; for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i) dest[bitset_i] |= src[bitset_i]; } static __inline__ void bitset_mask (bitset_t dest, const bitset_t src) { int bitset_i; for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i) dest[bitset_i] &= src[bitset_i]; } #ifdef RE_ENABLE_I18N /* Inline functions for re_string. */ static __inline__ int internal_function __attribute ((pure)) re_string_char_size_at (const re_string_t *pstr, int idx) { int byte_idx; if (pstr->mb_cur_max == 1) return 1; for (byte_idx = 1; idx + byte_idx < pstr->valid_len; ++byte_idx) if (pstr->wcs[idx + byte_idx] != WEOF) break; return byte_idx; } static __inline__ wint_t internal_function __attribute ((pure)) re_string_wchar_at (const re_string_t *pstr, int idx) { if (pstr->mb_cur_max == 1) return (wint_t) pstr->mbs[idx]; return (wint_t) pstr->wcs[idx]; } static int internal_function __attribute ((pure)) re_string_elem_size_at (const re_string_t *pstr, int idx) { # if 0 const unsigned char *p, *extra; const int32_t *table, *indirect; int32_t tmp; # include <locale/weight.h> uint_fast32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES); if (nrules != 0) { table = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB); extra = (const unsigned char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB); indirect = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_INDIRECTMB); p = pstr->mbs + idx; tmp = findidx (&p); return p - pstr->mbs - idx; } # endif return 1; } #endif /* RE_ENABLE_I18N */ #endif /* _REGEX_INTERNAL_H */