565 lines
21 KiB
C
565 lines
21 KiB
C
/* Definitions for data structures and routines for the regular
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expression library, version 0.12.
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Copyright (C) 1985-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library. Its master source is NOT part of
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the C library, however. The master source lives in /gd/gnu/lib.
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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, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA. */
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#ifndef _REGEX_H
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#define _REGEX_H 1
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/* Allow the use in C++ code. */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* POSIX says that <sys/types.h> must be included (by the caller) before
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<regex.h>. */
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#if !defined _POSIX_C_SOURCE && !defined _POSIX_SOURCE && defined VMS
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/* VMS doesn't have `size_t' in <sys/types.h>, even though POSIX says it
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should be there. */
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# include <stddef.h>
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#endif
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/* The following two types have to be signed and unsigned integer type
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wide enough to hold a value of a pointer. For most ANSI compilers
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ptrdiff_t and size_t should be likely OK. Still size of these two
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types is 2 for Microsoft C. Ugh... */
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typedef long int s_reg_t;
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typedef unsigned long int active_reg_t;
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/* The following bits are used to determine the regexp syntax we
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recognize. The set/not-set meanings are chosen so that Emacs syntax
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remains the value 0. The bits are given in alphabetical order, and
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the definitions shifted by one from the previous bit; thus, when we
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add or remove a bit, only one other definition need change. */
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typedef unsigned long int reg_syntax_t;
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/* If this bit is not set, then \ inside a bracket expression is literal.
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If set, then such a \ quotes the following character. */
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#define RE_BACKSLASH_ESCAPE_IN_LISTS ((unsigned long int) 1)
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/* If this bit is not set, then + and ? are operators, and \+ and \? are
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literals.
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If set, then \+ and \? are operators and + and ? are literals. */
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#define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)
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/* If this bit is set, then character classes are supported. They are:
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[:alpha:], [:upper:], [:lower:], [:digit:], [:alnum:], [:xdigit:],
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[:space:], [:print:], [:punct:], [:graph:], and [:cntrl:].
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If not set, then character classes are not supported. */
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#define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1)
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/* If this bit is set, then ^ and $ are always anchors (outside bracket
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expressions, of course).
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If this bit is not set, then it depends:
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^ is an anchor if it is at the beginning of a regular
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expression or after an open-group or an alternation operator;
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$ is an anchor if it is at the end of a regular expression, or
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before a close-group or an alternation operator.
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This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because
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POSIX draft 11.2 says that * etc. in leading positions is undefined.
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We already implemented a previous draft which made those constructs
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invalid, though, so we haven't changed the code back. */
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#define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1)
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/* If this bit is set, then special characters are always special
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regardless of where they are in the pattern.
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If this bit is not set, then special characters are special only in
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some contexts; otherwise they are ordinary. Specifically,
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* + ? and intervals are only special when not after the beginning,
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open-group, or alternation operator. */
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#define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1)
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/* If this bit is set, then *, +, ?, and { cannot be first in an re or
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immediately after an alternation or begin-group operator. */
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#define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1)
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/* If this bit is set, then . matches newline.
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If not set, then it doesn't. */
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#define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1)
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/* If this bit is set, then . doesn't match NUL.
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If not set, then it does. */
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#define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1)
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/* If this bit is set, nonmatching lists [^...] do not match newline.
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If not set, they do. */
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#define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1)
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/* If this bit is set, either \{...\} or {...} defines an
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interval, depending on RE_NO_BK_BRACES.
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If not set, \{, \}, {, and } are literals. */
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#define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1)
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/* If this bit is set, +, ? and | aren't recognized as operators.
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If not set, they are. */
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#define RE_LIMITED_OPS (RE_INTERVALS << 1)
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/* If this bit is set, newline is an alternation operator.
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If not set, newline is literal. */
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#define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1)
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/* If this bit is set, then `{...}' defines an interval, and \{ and \}
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are literals.
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If not set, then `\{...\}' defines an interval. */
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#define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1)
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/* If this bit is set, (...) defines a group, and \( and \) are literals.
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If not set, \(...\) defines a group, and ( and ) are literals. */
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#define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1)
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/* If this bit is set, then \<digit> matches <digit>.
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If not set, then \<digit> is a back-reference. */
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#define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1)
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/* If this bit is set, then | is an alternation operator, and \| is literal.
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If not set, then \| is an alternation operator, and | is literal. */
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#define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1)
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/* If this bit is set, then an ending range point collating higher
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than the starting range point, as in [z-a], is invalid.
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If not set, then when ending range point collates higher than the
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starting range point, the range is ignored. */
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#define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1)
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/* If this bit is set, then an unmatched ) is ordinary.
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If not set, then an unmatched ) is invalid. */
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#define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_EMPTY_RANGES << 1)
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/* If this bit is set, succeed as soon as we match the whole pattern,
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without further backtracking. */
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#define RE_NO_POSIX_BACKTRACKING (RE_UNMATCHED_RIGHT_PAREN_ORD << 1)
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/* If this bit is set, do not process the GNU regex operators.
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If not set, then the GNU regex operators are recognized. */
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#define RE_NO_GNU_OPS (RE_NO_POSIX_BACKTRACKING << 1)
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/* If this bit is set, turn on internal regex debugging.
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If not set, and debugging was on, turn it off.
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This only works if regex.c is compiled -DDEBUG.
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We define this bit always, so that all that's needed to turn on
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debugging is to recompile regex.c; the calling code can always have
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this bit set, and it won't affect anything in the normal case. */
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#define RE_DEBUG (RE_NO_GNU_OPS << 1)
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/* If this bit is set, a syntactically invalid interval is treated as
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a string of ordinary characters. For example, the ERE 'a{1' is
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treated as 'a\{1'. */
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#define RE_INVALID_INTERVAL_ORD (RE_DEBUG << 1)
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/* This global variable defines the particular regexp syntax to use (for
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some interfaces). When a regexp is compiled, the syntax used is
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stored in the pattern buffer, so changing this does not affect
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already-compiled regexps. */
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extern reg_syntax_t re_syntax_options;
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/* Define combinations of the above bits for the standard possibilities.
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(The [[[ comments delimit what gets put into the Texinfo file, so
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don't delete them!) */
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/* [[[begin syntaxes]]] */
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#define RE_SYNTAX_EMACS 0
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#define RE_SYNTAX_AWK \
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(RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DOT_NOT_NULL \
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| RE_NO_BK_PARENS | RE_NO_BK_REFS \
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| RE_NO_BK_VBAR | RE_NO_EMPTY_RANGES \
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| RE_DOT_NEWLINE | RE_CONTEXT_INDEP_ANCHORS \
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| RE_UNMATCHED_RIGHT_PAREN_ORD | RE_NO_GNU_OPS)
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#define RE_SYNTAX_GNU_AWK \
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((RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DEBUG) \
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& ~(RE_DOT_NOT_NULL | RE_INTERVALS | RE_CONTEXT_INDEP_OPS))
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#define RE_SYNTAX_POSIX_AWK \
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(RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS \
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| RE_INTERVALS | RE_NO_GNU_OPS)
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#define RE_SYNTAX_GREP \
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(RE_BK_PLUS_QM | RE_CHAR_CLASSES \
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| RE_HAT_LISTS_NOT_NEWLINE | RE_INTERVALS \
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| RE_NEWLINE_ALT)
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#define RE_SYNTAX_EGREP \
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(RE_CHAR_CLASSES | RE_CONTEXT_INDEP_ANCHORS \
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| RE_CONTEXT_INDEP_OPS | RE_HAT_LISTS_NOT_NEWLINE \
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| RE_NEWLINE_ALT | RE_NO_BK_PARENS \
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| RE_NO_BK_VBAR)
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#define RE_SYNTAX_POSIX_EGREP \
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(RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES \
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| RE_INVALID_INTERVAL_ORD)
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/* P1003.2/D11.2, section 4.20.7.1, lines 5078ff. */
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#define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC
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#define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC
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/* Syntax bits common to both basic and extended POSIX regex syntax. */
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#define _RE_SYNTAX_POSIX_COMMON \
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(RE_CHAR_CLASSES | RE_DOT_NEWLINE | RE_DOT_NOT_NULL \
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| RE_INTERVALS | RE_NO_EMPTY_RANGES)
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#define RE_SYNTAX_POSIX_BASIC \
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(_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM)
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/* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes
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RE_LIMITED_OPS, i.e., \? \+ \| are not recognized. Actually, this
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isn't minimal, since other operators, such as \`, aren't disabled. */
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#define RE_SYNTAX_POSIX_MINIMAL_BASIC \
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(_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS)
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#define RE_SYNTAX_POSIX_EXTENDED \
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(_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \
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| RE_CONTEXT_INDEP_OPS | RE_NO_BK_BRACES \
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| RE_NO_BK_PARENS | RE_NO_BK_VBAR \
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| RE_CONTEXT_INVALID_OPS | RE_UNMATCHED_RIGHT_PAREN_ORD)
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/* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INDEP_OPS is
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removed and RE_NO_BK_REFS is added. */
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#define RE_SYNTAX_POSIX_MINIMAL_EXTENDED \
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(_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \
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| RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES \
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| RE_NO_BK_PARENS | RE_NO_BK_REFS \
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| RE_NO_BK_VBAR | RE_UNMATCHED_RIGHT_PAREN_ORD)
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/* [[[end syntaxes]]] */
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/* Maximum number of duplicates an interval can allow. Some systems
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(erroneously) define this in other header files, but we want our
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value, so remove any previous define. */
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#ifdef RE_DUP_MAX
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# undef RE_DUP_MAX
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#endif
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/* If sizeof(int) == 2, then ((1 << 15) - 1) overflows. */
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#define RE_DUP_MAX (0x7fff)
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/* POSIX `cflags' bits (i.e., information for `regcomp'). */
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/* If this bit is set, then use extended regular expression syntax.
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If not set, then use basic regular expression syntax. */
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#define REG_EXTENDED 1
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/* If this bit is set, then ignore case when matching.
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If not set, then case is significant. */
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#define REG_ICASE (REG_EXTENDED << 1)
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/* If this bit is set, then anchors do not match at newline
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characters in the string.
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If not set, then anchors do match at newlines. */
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#define REG_NEWLINE (REG_ICASE << 1)
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/* If this bit is set, then report only success or fail in regexec.
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If not set, then returns differ between not matching and errors. */
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#define REG_NOSUB (REG_NEWLINE << 1)
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/* POSIX `eflags' bits (i.e., information for regexec). */
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/* If this bit is set, then the beginning-of-line operator doesn't match
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the beginning of the string (presumably because it's not the
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beginning of a line).
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If not set, then the beginning-of-line operator does match the
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beginning of the string. */
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#define REG_NOTBOL 1
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/* Like REG_NOTBOL, except for the end-of-line. */
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#define REG_NOTEOL (1 << 1)
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/* If any error codes are removed, changed, or added, update the
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`re_error_msg' table in regex.c. */
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typedef enum
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{
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#ifdef _XOPEN_SOURCE
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REG_ENOSYS = -1, /* This will never happen for this implementation. */
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#endif
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REG_NOERROR = 0, /* Success. */
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REG_NOMATCH, /* Didn't find a match (for regexec). */
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/* POSIX regcomp return error codes. (In the order listed in the
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standard.) */
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REG_BADPAT, /* Invalid pattern. */
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REG_ECOLLATE, /* Not implemented. */
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REG_ECTYPE, /* Invalid character class name. */
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REG_EESCAPE, /* Trailing backslash. */
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REG_ESUBREG, /* Invalid back reference. */
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REG_EBRACK, /* Unmatched left bracket. */
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REG_EPAREN, /* Parenthesis imbalance. */
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REG_EBRACE, /* Unmatched \{. */
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REG_BADBR, /* Invalid contents of \{\}. */
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REG_ERANGE, /* Invalid range end. */
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REG_ESPACE, /* Ran out of memory. */
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REG_BADRPT, /* No preceding re for repetition op. */
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/* Error codes we've added. */
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REG_EEND, /* Premature end. */
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REG_ESIZE, /* Compiled pattern bigger than 2^16 bytes. */
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REG_ERPAREN /* Unmatched ) or \); not returned from regcomp. */
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} reg_errcode_t;
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/* This data structure represents a compiled pattern. Before calling
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the pattern compiler, the fields `buffer', `allocated', `fastmap',
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`translate', and `no_sub' can be set. After the pattern has been
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compiled, the `re_nsub' field is available. All other fields are
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private to the regex routines. */
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#ifndef RE_TRANSLATE_TYPE
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# define RE_TRANSLATE_TYPE char *
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#endif
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struct re_pattern_buffer
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{
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/* [[[begin pattern_buffer]]] */
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/* Space that holds the compiled pattern. It is declared as
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`unsigned char *' because its elements are
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sometimes used as array indexes. */
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unsigned char *buffer;
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/* Number of bytes to which `buffer' points. */
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unsigned long int allocated;
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/* Number of bytes actually used in `buffer'. */
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unsigned long int used;
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/* Syntax setting with which the pattern was compiled. */
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reg_syntax_t syntax;
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/* Pointer to a fastmap, if any, otherwise zero. re_search uses
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the fastmap, if there is one, to skip over impossible
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starting points for matches. */
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char *fastmap;
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/* Either a translate table to apply to all characters before
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comparing them, or zero for no translation. The translation
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is applied to a pattern when it is compiled and to a string
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when it is matched. */
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RE_TRANSLATE_TYPE translate;
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/* Number of subexpressions found by the compiler. */
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size_t re_nsub;
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/* Zero if this pattern cannot match the empty string, one else.
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Well, in truth it's used only in `re_search_2', to see
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whether or not we should use the fastmap, so we don't set
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this absolutely perfectly; see `re_compile_fastmap' (the
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`duplicate' case). */
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unsigned can_be_null : 1;
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/* If REGS_UNALLOCATED, allocate space in the `regs' structure
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for `max (RE_NREGS, re_nsub + 1)' groups.
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If REGS_REALLOCATE, reallocate space if necessary.
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If REGS_FIXED, use what's there. */
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#define REGS_UNALLOCATED 0
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#define REGS_REALLOCATE 1
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#define REGS_FIXED 2
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unsigned regs_allocated : 2;
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/* Set to zero when `regex_compile' compiles a pattern; set to one
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by `re_compile_fastmap' if it updates the fastmap. */
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unsigned fastmap_accurate : 1;
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/* If set, `re_match_2' does not return information about
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subexpressions. */
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unsigned no_sub : 1;
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/* If set, a beginning-of-line anchor doesn't match at the
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beginning of the string. */
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unsigned not_bol : 1;
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/* Similarly for an end-of-line anchor. */
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unsigned not_eol : 1;
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/* If true, an anchor at a newline matches. */
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unsigned newline_anchor : 1;
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/* [[[end pattern_buffer]]] */
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};
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typedef struct re_pattern_buffer regex_t;
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/* Type for byte offsets within the string. POSIX mandates this. */
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typedef int regoff_t;
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/* This is the structure we store register match data in. See
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regex.texinfo for a full description of what registers match. */
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struct re_registers
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{
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unsigned num_regs;
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regoff_t *start;
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regoff_t *end;
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};
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/* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer,
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`re_match_2' returns information about at least this many registers
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the first time a `regs' structure is passed. */
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#ifndef RE_NREGS
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# define RE_NREGS 30
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#endif
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/* POSIX specification for registers. Aside from the different names than
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`re_registers', POSIX uses an array of structures, instead of a
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structure of arrays. */
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typedef struct
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{
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regoff_t rm_so; /* Byte offset from string's start to substring's start. */
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regoff_t rm_eo; /* Byte offset from string's start to substring's end. */
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} regmatch_t;
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/* Declarations for routines. */
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/* To avoid duplicating every routine declaration -- once with a
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prototype (if we are ANSI), and once without (if we aren't) -- we
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use the following macro to declare argument types. This
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unfortunately clutters up the declarations a bit, but I think it's
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worth it. */
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/* Sets the current default syntax to SYNTAX, and return the old syntax.
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You can also simply assign to the `re_syntax_options' variable. */
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extern reg_syntax_t re_set_syntax (reg_syntax_t syntax);
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/* Compile the regular expression PATTERN, with length LENGTH
|
||
and syntax given by the global `re_syntax_options', into the buffer
|
||
BUFFER. Return NULL if successful, and an error string if not. */
|
||
extern const char *re_compile_pattern (const char *pattern, size_t length,
|
||
struct re_pattern_buffer *buffer);
|
||
|
||
|
||
/* Compile a fastmap for the compiled pattern in BUFFER; used to
|
||
accelerate searches. Return 0 if successful and -2 if was an
|
||
internal error. */
|
||
extern int re_compile_fastmap (struct re_pattern_buffer *buffer);
|
||
|
||
|
||
/* Search in the string STRING (with length LENGTH) for the pattern
|
||
compiled into BUFFER. Start searching at position START, for RANGE
|
||
characters. Return the starting position of the match, -1 for no
|
||
match, or -2 for an internal error. Also return register
|
||
information in REGS (if REGS and BUFFER->no_sub are nonzero). */
|
||
extern int re_search (struct re_pattern_buffer *buffer, const char *string,
|
||
int length, int start, int range,
|
||
struct re_registers *regs);
|
||
|
||
|
||
/* Like `re_search', but search in the concatenation of STRING1 and
|
||
STRING2. Also, stop searching at index START + STOP. */
|
||
extern int re_search_2 (struct re_pattern_buffer *buffer, const char *string1,
|
||
int length1, const char *string2, int length2,
|
||
int start, int range, struct re_registers *regs,
|
||
int stop);
|
||
|
||
|
||
/* Like `re_search', but return how many characters in STRING the regexp
|
||
in BUFFER matched, starting at position START. */
|
||
extern int re_match (struct re_pattern_buffer *buffer, const char *string,
|
||
int length, int start, struct re_registers *regs);
|
||
|
||
|
||
/* Relates to `re_match' as `re_search_2' relates to `re_search'. */
|
||
extern int re_match_2 (struct re_pattern_buffer *buffer, const char *string1,
|
||
int length1, const char *string2, int length2,
|
||
int start, struct re_registers *regs, int stop);
|
||
|
||
|
||
/* Set REGS to hold NUM_REGS registers, storing them in STARTS and
|
||
ENDS. Subsequent matches using BUFFER and REGS will use this memory
|
||
for recording register information. STARTS and ENDS must be
|
||
allocated with malloc, and must each be at least `NUM_REGS * sizeof
|
||
(regoff_t)' bytes long.
|
||
|
||
If NUM_REGS == 0, then subsequent matches should allocate their own
|
||
register data.
|
||
|
||
Unless this function is called, the first search or match using
|
||
PATTERN_BUFFER will allocate its own register data, without
|
||
freeing the old data. */
|
||
extern void re_set_registers (struct re_pattern_buffer *buffer,
|
||
struct re_registers *regs,
|
||
unsigned num_regs, regoff_t *starts,
|
||
regoff_t *ends);
|
||
|
||
#if defined _REGEX_RE_COMP || defined _LIBC
|
||
# ifndef _CRAY
|
||
/* 4.2 bsd compatibility. */
|
||
extern char *re_comp (const char *);
|
||
extern int re_exec (const char *);
|
||
# endif
|
||
#endif
|
||
|
||
/* GCC 2.95 and later have "__restrict"; C99 compilers have
|
||
"restrict", and "configure" may have defined "restrict". */
|
||
#ifndef __restrict
|
||
# if ! (2 < __GNUC__ || (2 == __GNUC__ && 95 <= __GNUC_MINOR__))
|
||
# if defined restrict || 199901L <= __STDC_VERSION__
|
||
# define __restrict restrict
|
||
# else
|
||
# define __restrict
|
||
# endif
|
||
# endif
|
||
#endif
|
||
|
||
/* GCC 3.1 and later support declaring arrays as non-overlapping
|
||
using the syntax array_name[restrict] */
|
||
#ifndef __restrict_arr
|
||
# if ! (3 < __GNUC__ || (3 == __GNUC__ && 1 <= __GNUC_MINOR__)) || defined (__GNUG__)
|
||
# define __restrict_arr
|
||
# else
|
||
# define __restrict_arr __restrict
|
||
# endif
|
||
#endif
|
||
|
||
/* POSIX compatibility. */
|
||
extern int regcomp (regex_t *__restrict __preg,
|
||
const char *__restrict __pattern,
|
||
int __cflags);
|
||
|
||
#if (__GNUC__)
|
||
__extension__
|
||
#endif
|
||
extern int regexec (const regex_t *__restrict __preg,
|
||
const char *__restrict __string, size_t __nmatch,
|
||
regmatch_t __pmatch[__restrict_arr],
|
||
int __eflags);
|
||
|
||
extern size_t regerror (int __errcode, const regex_t *__preg,
|
||
char *__errbuf, size_t __errbuf_size);
|
||
|
||
extern void regfree (regex_t *__preg);
|
||
|
||
|
||
#ifdef __cplusplus
|
||
}
|
||
#endif /* C++ */
|
||
|
||
#endif /* regex.h */
|
||
|
||
/*
|
||
Local variables:
|
||
make-backup-files: t
|
||
version-control: t
|
||
trim-versions-without-asking: nil
|
||
End:
|
||
*/
|