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91cb46d948
* regexp/jimregexp.h, regexp/jimregexp.c: Fix from JimTcl. -- Apply the change in JimTcl: commit ac35b8a6ec417f75b5ec86ca64ea1614a8170a38 Author: Steve Bennett <steveb@workware.net.au> Date: Mon May 4 20:43:46 2020 +1000 regexp: Improved error message Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
1924 lines
45 KiB
C
1924 lines
45 KiB
C
/*
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* vi:se ts=8:
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*
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* regcomp and regexec -- regsub and regerror are elsewhere
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*
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* Copyright (c) 1986 by University of Toronto.
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* Written by Henry Spencer. Not derived from licensed software.
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*
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* Permission is granted to anyone to use this software for any
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* purpose on any computer system, and to redistribute it freely,
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* subject to the following restrictions:
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*
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* 1. The author is not responsible for the consequences of use of
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* this software, no matter how awful, even if they arise
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* from defects in it.
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*
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* 2. The origin of this software must not be misrepresented, either
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* by explicit claim or by omission.
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*
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* 3. Altered versions must be plainly marked as such, and must not
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* be misrepresented as being the original software.
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*** THIS IS AN ALTERED VERSION. It was altered by John Gilmore,
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*** hoptoad!gnu, on 27 Dec 1986, to add \n as an alternative to |
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*** to assist in implementing egrep.
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*** THIS IS AN ALTERED VERSION. It was altered by John Gilmore,
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*** hoptoad!gnu, on 27 Dec 1986, to add \< and \> for word-matching
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*** as in BSD grep and ex.
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*** THIS IS AN ALTERED VERSION. It was altered by John Gilmore,
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*** hoptoad!gnu, on 28 Dec 1986, to optimize characters quoted with \.
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*** THIS IS AN ALTERED VERSION. It was altered by James A. Woods,
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*** ames!jaw, on 19 June 1987, to quash a regcomp() redundancy.
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*** THIS IS AN ALTERED VERSION. It was altered by Christopher Seiwald
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*** seiwald@vix.com, on 28 August 1993, for use in jam. Regmagic.h
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*** was moved into regexp.h, and the include of regexp.h now uses "'s
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*** to avoid conflicting with the system regexp.h. Const, bless its
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*** soul, was removed so it can compile everywhere. The declaration
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*** of strchr() was in conflict on AIX, so it was removed (as it is
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*** happily defined in string.h).
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*** THIS IS AN ALTERED VERSION. It was altered by Christopher Seiwald
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*** seiwald@perforce.com, on 20 January 2000, to use function prototypes.
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*** THIS IS AN ALTERED VERSION. It was altered by Christopher Seiwald
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*** seiwald@perforce.com, on 05 November 2002, to const string literals.
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*
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* THIS IS AN ALTERED VERSION. It was altered by Steve Bennett <steveb@workware.net.au>
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* on 16 October 2010, to remove static state and add better Tcl ARE compatibility.
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* This includes counted repetitions, UTF-8 support, character classes,
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* shorthand character classes, increased number of parentheses to 100,
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* backslash escape sequences. It also removes \n as an alternative to |.
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*
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*** THIS IS AN ALTERED VERSION. It was altered to offer POSIX-like
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*** regular expression routines of regcomp/regexec/regerror/regfree,
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*** with UTF-8 support, by NIIBE Yutaka <gniibe@fsij.org> on
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*** 2020-02-14.
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*
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* Beware that some of this code is subtly aware of the way operator
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* precedence is structured in regular expressions. Serious changes in
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* regular-expression syntax might require a total rethink.
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*/
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#if defined(JIM_REGEXP)
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include "jimregexp.h"
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#include "utf8.h"
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#define UCHAR(c) ((unsigned char)(c))
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/* An arbitrary limit, but this seems enough. Must be less than 1000. */
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#define REG_MAX_PAREN 100
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/*
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* Structure for regexp "program". This is essentially a linear encoding
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* of a nondeterministic finite-state machine (aka syntax charts or
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* "railroad normal form" in parsing technology). Each node is an opcode
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* plus a "next" pointer, possibly plus an operand. "Next" pointers of
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* all nodes except BRANCH implement concatenation; a "next" pointer with
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* a BRANCH on both ends of it is connecting two alternatives. (Here we
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* have one of the subtle syntax dependencies: an individual BRANCH (as
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* opposed to a collection of them) is never concatenated with anything
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* because of operator precedence.) The operand of some types of node is
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* a literal string; for others, it is a node leading into a sub-FSM. In
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* particular, the operand of a BRANCH node is the first node of the branch.
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* (NB this is *not* a tree structure: the tail of the branch connects
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* to the thing following the set of BRANCHes.) The opcodes are:
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*/
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/* definition number opnd? meaning */
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#define END 0 /* no End of program. */
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#define BOL 1 /* no Match "" at beginning of line. */
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#define EOL 2 /* no Match "" at end of line. */
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#define ANY 3 /* no Match any one character. */
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#define ANYOF 4 /* str Match any character in this string. */
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#define ANYBUT 5 /* str Match any character not in this string. */
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#define BRANCH 6 /* node Match this alternative, or the next... */
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#define BACK 7 /* no Match "", "next" ptr points backward. */
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#define EXACTLY 8 /* str Match this string. */
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#define NOTHING 9 /* no Match empty string. */
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#define REP 10 /* max,min Match this (simple) thing [min,max] times. */
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#define REPMIN 11 /* max,min Match this (simple) thing [min,max] times, minimal match. */
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#define REPX 12 /* max,min Match this (complex) thing [min,max] times. */
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#define REPXMIN 13 /* max,min Match this (complex) thing [min,max] times, minimal match. */
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#define BOLX 14 /* no Match "" at beginning of input. */
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#define EOLX 15 /* no Match "" at end of input. */
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#define WORDA 16 /* no Match "" at wordchar, where prev is nonword */
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#define WORDZ 17 /* no Match "" at nonwordchar, where prev is word */
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#define OPENNC 1000 /* no Non-capturing parentheses - must be OPEN-1 */
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#define OPEN 1001 /* no Mark this point in input as start of #n. */
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/* OPEN+1 is number 1, etc. */
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/* must not be any other opts between OPEN and CLOSE */
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#define CLOSENC 2000 /* no Non-capturing parentheses - must be CLOSE-1 */
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#define CLOSE 2001 /* no Analogous to OPEN. */
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#define CLOSE_END (CLOSE+REG_MAX_PAREN)
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/*
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* The first word of the regexp internal "program" is actually this magic
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* number; the start node begins in the second word.
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*/
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#define REG_MAGIC 0xFADED00D
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/*
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* Opcode notes:
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*
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* BRANCH The set of branches constituting a single choice are hooked
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* together with their "next" pointers, since precedence prevents
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* anything being concatenated to any individual branch. The
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* "next" pointer of the last BRANCH in a choice points to the
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* thing following the whole choice. This is also where the
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* final "next" pointer of each individual branch points; each
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* branch starts with the operand node of a BRANCH node.
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*
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* BACK Normal "next" pointers all implicitly point forward; BACK
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* exists to make loop structures possible.
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*
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* REP,REPX Repeated matches ('?', '*', '+' and {min,max}) are implemented
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* as either simple repeats (REP) or complex repeats (REPX).
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* These opcodes include a "min" and "max" count after the opcode.
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* This is followed by a fourth "current count" word that is
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* only used by REPX, as it implements a recursive match.
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* REPMIN and REPXMIN are identical except they implement minimal repeats.
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*
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* OPEN,CLOSE ...are numbered at compile time.
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*/
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/*
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* A node is one word of opcode followed by one word of "next" pointer.
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* The "next" pointer value is a positive offset from the opcode of the node
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* containing it.
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* An operand, if any, simply follows the node. (Note that much of the
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* code generation knows about this implicit relationship.)
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*/
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#define OP(preg, p) (preg->program[p])
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#define NEXT(preg, p) (preg->program[p + 1])
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#define OPERAND(p) ((p) + 2)
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/*
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* See regmagic.h for one further detail of program structure.
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*/
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/*
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* Utility definitions.
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*/
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#define FAIL(R,M) { (R)->err = (M); return (M); }
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#define ISMULT(c) ((c) == '*' || (c) == '+' || (c) == '?' || (c) == '{')
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#define META "^$.[()|?{+*"
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/*
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* Flags to be passed up and down.
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*/
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#define HASWIDTH 1 /* Known never to match null string. */
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#define SIMPLE 2 /* Simple enough to be STAR/PLUS operand. */
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#define SPSTART 4 /* Starts with * or +. */
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#define WORST 0 /* Worst case. */
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#define MAX_REP_COUNT 1000000
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/*
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* Forward declarations for regcomp()'s friends.
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*/
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static int reg(regex_t *preg, int paren /* Parenthesized? */, int *flagp );
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static int regpiece(regex_t *preg, int *flagp );
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static int regbranch(regex_t *preg, int *flagp );
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static int regatom(regex_t *preg, int *flagp );
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static int regnode(regex_t *preg, int op );
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static int regnext(regex_t *preg, int p );
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static void regc(regex_t *preg, int b );
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static int reginsert(regex_t *preg, int op, int size, int opnd );
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static void regtail(regex_t *preg, int p, int val);
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static void regoptail(regex_t *preg, int p, int val );
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static int regopsize(regex_t *preg, int p );
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static int reg_range_find(const int *string, int c);
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static const char *str_find(const char *string, int c, int nocase);
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static int prefix_cmp(const int *prog, int proglen, const char *string, int nocase);
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/*#define DEBUG*/
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#ifdef DEBUG
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static int regnarrate = 0;
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static void regdump(regex_t *preg);
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static const char *regprop( int op );
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#endif
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/**
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* Returns the length of the null-terminated integer sequence.
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*/
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static int str_int_len(const int *seq)
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{
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int n = 0;
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while (*seq++) {
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n++;
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}
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return n;
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}
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/*
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- regcomp - compile a regular expression into internal code
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*
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* We can't allocate space until we know how big the compiled form will be,
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* but we can't compile it (and thus know how big it is) until we've got a
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* place to put the code. So we cheat: we compile it twice, once with code
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* generation turned off and size counting turned on, and once "for real".
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* This also means that we don't allocate space until we are sure that the
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* thing really will compile successfully, and we never have to move the
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* code and thus invalidate pointers into it. (Note that it has to be in
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* one piece because free() must be able to free it all.)
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*
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* Beware that the optimization-preparation code in here knows about some
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* of the structure of the compiled regexp.
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*/
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int regcomp(regex_t *preg, const char *exp, int cflags)
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{
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int scan;
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int longest;
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unsigned len;
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int flags;
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#ifdef DEBUG
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fprintf(stderr, "Compiling: '%s'\n", exp);
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#endif
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memset(preg, 0, sizeof(*preg));
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if (exp == NULL)
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FAIL(preg, REG_ERR_NULL_ARGUMENT);
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/* First pass: determine size, legality. */
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preg->cflags = cflags;
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preg->regparse = exp;
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/* Allocate space. */
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preg->proglen = (strlen(exp) + 1) * 5;
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preg->program = malloc(preg->proglen * sizeof(int));
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if (preg->program == NULL)
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FAIL(preg, REG_ERR_NOMEM);
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/* Note that since we store a magic value as the first item in the program,
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* program offsets will never be 0
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*/
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regc(preg, REG_MAGIC);
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if (reg(preg, 0, &flags) == 0) {
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return preg->err;
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}
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/* Small enough for pointer-storage convention? */
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if (preg->re_nsub >= REG_MAX_PAREN) /* Probably could be 65535L. */
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FAIL(preg,REG_ERR_TOO_BIG);
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/* Dig out information for optimizations. */
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preg->regstart = 0; /* Worst-case defaults. */
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preg->reganch = 0;
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preg->regmust = 0;
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preg->regmlen = 0;
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scan = 1; /* First BRANCH. */
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if (OP(preg, regnext(preg, scan)) == END) { /* Only one top-level choice. */
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scan = OPERAND(scan);
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/* Starting-point info. */
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if (OP(preg, scan) == EXACTLY) {
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preg->regstart = preg->program[OPERAND(scan)];
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}
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else if (OP(preg, scan) == BOL)
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preg->reganch++;
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/*
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* If there's something expensive in the r.e., find the
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* longest literal string that must appear and make it the
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* regmust. Resolve ties in favor of later strings, since
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* the regstart check works with the beginning of the r.e.
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* and avoiding duplication strengthens checking. Not a
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* strong reason, but sufficient in the absence of others.
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*/
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if (flags&SPSTART) {
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longest = 0;
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len = 0;
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for (; scan != 0; scan = regnext(preg, scan)) {
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if (OP(preg, scan) == EXACTLY) {
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int plen = str_int_len(preg->program + OPERAND(scan));
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if (plen >= len) {
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longest = OPERAND(scan);
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len = plen;
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}
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}
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}
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preg->regmust = longest;
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preg->regmlen = len;
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}
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}
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#ifdef DEBUG
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regdump(preg);
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#endif
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return 0;
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}
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/*
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- reg - regular expression, i.e. main body or parenthesized thing
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*
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* Caller must absorb opening parenthesis.
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*
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* Combining parenthesis handling with the base level of regular expression
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* is a trifle forced, but the need to tie the tails of the branches to what
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* follows makes it hard to avoid.
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*/
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static int reg(regex_t *preg, int paren /* Parenthesized? */, int *flagp )
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{
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int ret;
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int br;
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int ender;
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int parno = 0;
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int flags;
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*flagp = HASWIDTH; /* Tentatively. */
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/* Make an OPEN node, if parenthesized. */
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if (paren) {
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if (preg->regparse[0] == '?' && preg->regparse[1] == ':') {
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/* non-capturing paren */
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preg->regparse += 2;
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parno = -1;
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}
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else {
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parno = ++preg->re_nsub;
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}
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ret = regnode(preg, OPEN+parno);
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} else
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ret = 0;
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/* Pick up the branches, linking them together. */
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br = regbranch(preg, &flags);
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if (br == 0)
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return 0;
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if (ret != 0)
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regtail(preg, ret, br); /* OPEN -> first. */
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else
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ret = br;
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if (!(flags&HASWIDTH))
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*flagp &= ~HASWIDTH;
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*flagp |= flags&SPSTART;
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while (*preg->regparse == '|') {
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preg->regparse++;
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br = regbranch(preg, &flags);
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if (br == 0)
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return 0;
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regtail(preg, ret, br); /* BRANCH -> BRANCH. */
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if (!(flags&HASWIDTH))
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*flagp &= ~HASWIDTH;
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*flagp |= flags&SPSTART;
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}
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/* Make a closing node, and hook it on the end. */
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ender = regnode(preg, (paren) ? CLOSE+parno : END);
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regtail(preg, ret, ender);
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/* Hook the tails of the branches to the closing node. */
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for (br = ret; br != 0; br = regnext(preg, br))
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regoptail(preg, br, ender);
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/* Check for proper termination. */
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if (paren && *preg->regparse++ != ')') {
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preg->err = REG_ERR_UNMATCHED_PAREN;
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return 0;
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} else if (!paren && *preg->regparse != '\0') {
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if (*preg->regparse == ')') {
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preg->err = REG_ERR_UNMATCHED_PAREN;
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return 0;
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} else {
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preg->err = REG_ERR_JUNK_ON_END;
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return 0;
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}
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}
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return(ret);
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}
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/*
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- regbranch - one alternative of an | operator
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*
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* Implements the concatenation operator.
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*/
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static int regbranch(regex_t *preg, int *flagp )
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{
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int ret;
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int chain;
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int latest;
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int flags;
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*flagp = WORST; /* Tentatively. */
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ret = regnode(preg, BRANCH);
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chain = 0;
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while (*preg->regparse != '\0' && *preg->regparse != ')' &&
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*preg->regparse != '|') {
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latest = regpiece(preg, &flags);
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if (latest == 0)
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return 0;
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*flagp |= flags&HASWIDTH;
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if (chain == 0) {/* First piece. */
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*flagp |= flags&SPSTART;
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}
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else {
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regtail(preg, chain, latest);
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}
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chain = latest;
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}
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if (chain == 0) /* Loop ran zero times. */
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(void) regnode(preg, NOTHING);
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return(ret);
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}
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/*
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- regpiece - something followed by possible [*+?]
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*
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* Note that the branching code sequences used for ? and the general cases
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* of * and + are somewhat optimized: they use the same NOTHING node as
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* both the endmarker for their branch list and the body of the last branch.
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* It might seem that this node could be dispensed with entirely, but the
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* endmarker role is not redundant.
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*/
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static int regpiece(regex_t *preg, int *flagp)
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{
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int ret;
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char op;
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int next;
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int flags;
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int min;
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int max;
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ret = regatom(preg, &flags);
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if (ret == 0)
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return 0;
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op = *preg->regparse;
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if (!ISMULT(op)) {
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*flagp = flags;
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return(ret);
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}
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if (!(flags&HASWIDTH) && op != '?') {
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preg->err = REG_ERR_OPERAND_COULD_BE_EMPTY;
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return 0;
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}
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/* Handle braces (counted repetition) by expansion */
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if (op == '{') {
|
|
char *end;
|
|
|
|
min = strtoul(preg->regparse + 1, &end, 10);
|
|
if (end == preg->regparse + 1) {
|
|
preg->err = REG_ERR_BAD_COUNT;
|
|
return 0;
|
|
}
|
|
if (*end == '}') {
|
|
max = min;
|
|
}
|
|
else if (*end == '\0') {
|
|
preg->err = REG_ERR_UNMATCHED_BRACES;
|
|
return 0;
|
|
}
|
|
else {
|
|
preg->regparse = end;
|
|
max = strtoul(preg->regparse + 1, &end, 10);
|
|
if (*end != '}') {
|
|
preg->err = REG_ERR_UNMATCHED_BRACES;
|
|
return 0;
|
|
}
|
|
}
|
|
if (end == preg->regparse + 1) {
|
|
max = MAX_REP_COUNT;
|
|
}
|
|
else if (max < min || max >= 100) {
|
|
preg->err = REG_ERR_BAD_COUNT;
|
|
return 0;
|
|
}
|
|
if (min >= 100) {
|
|
preg->err = REG_ERR_BAD_COUNT;
|
|
return 0;
|
|
}
|
|
|
|
preg->regparse = strchr(preg->regparse, '}');
|
|
}
|
|
else {
|
|
min = (op == '+');
|
|
max = (op == '?' ? 1 : MAX_REP_COUNT);
|
|
}
|
|
|
|
if (preg->regparse[1] == '?') {
|
|
preg->regparse++;
|
|
next = reginsert(preg, flags & SIMPLE ? REPMIN : REPXMIN, 5, ret);
|
|
}
|
|
else {
|
|
next = reginsert(preg, flags & SIMPLE ? REP: REPX, 5, ret);
|
|
}
|
|
preg->program[ret + 2] = max;
|
|
preg->program[ret + 3] = min;
|
|
preg->program[ret + 4] = 0;
|
|
|
|
*flagp = (min) ? (WORST|HASWIDTH) : (WORST|SPSTART);
|
|
|
|
if (!(flags & SIMPLE)) {
|
|
int back = regnode(preg, BACK);
|
|
regtail(preg, back, ret);
|
|
regtail(preg, next, back);
|
|
}
|
|
|
|
preg->regparse++;
|
|
if (ISMULT(*preg->regparse)) {
|
|
preg->err = REG_ERR_NESTED_COUNT;
|
|
return 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Add all characters in the inclusive range between lower and upper.
|
|
*
|
|
* Handles a swapped range (upper < lower).
|
|
*/
|
|
static void reg_addrange(regex_t *preg, int lower, int upper)
|
|
{
|
|
if (lower > upper) {
|
|
reg_addrange(preg, upper, lower);
|
|
}
|
|
/* Add a range as length, start */
|
|
regc(preg, upper - lower + 1);
|
|
regc(preg, lower);
|
|
}
|
|
|
|
/**
|
|
* Add a null-terminated literal string as a set of ranges.
|
|
*/
|
|
static void reg_addrange_str(regex_t *preg, const char *str)
|
|
{
|
|
while (*str) {
|
|
reg_addrange(preg, *str, *str);
|
|
str++;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Extracts the next unicode char from utf8.
|
|
*
|
|
* If 'upper' is set, converts the char to uppercase.
|
|
*/
|
|
static int reg_utf8_tounicode_case(const char *s, int *uc, int upper)
|
|
{
|
|
int l = utf8_tounicode(s, uc);
|
|
if (upper) {
|
|
*uc = utf8_upper(*uc);
|
|
}
|
|
return l;
|
|
}
|
|
|
|
/**
|
|
* Converts a hex digit to decimal.
|
|
*
|
|
* Returns -1 for an invalid hex digit.
|
|
*/
|
|
static int hexdigitval(int c)
|
|
{
|
|
if (c >= '0' && c <= '9')
|
|
return c - '0';
|
|
if (c >= 'a' && c <= 'f')
|
|
return c - 'a' + 10;
|
|
if (c >= 'A' && c <= 'F')
|
|
return c - 'A' + 10;
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Parses up to 'n' hex digits at 's' and stores the result in *uc.
|
|
*
|
|
* Returns the number of hex digits parsed.
|
|
* If there are no hex digits, returns 0 and stores nothing.
|
|
*/
|
|
static int parse_hex(const char *s, int n, int *uc)
|
|
{
|
|
int val = 0;
|
|
int k;
|
|
|
|
for (k = 0; k < n; k++) {
|
|
int c = hexdigitval(*s++);
|
|
if (c == -1) {
|
|
break;
|
|
}
|
|
val = (val << 4) | c;
|
|
}
|
|
if (k) {
|
|
*uc = val;
|
|
}
|
|
return k;
|
|
}
|
|
|
|
/**
|
|
* Call for chars after a backlash to decode the escape sequence.
|
|
*
|
|
* Stores the result in *ch.
|
|
*
|
|
* Returns the number of bytes consumed.
|
|
*/
|
|
static int reg_decode_escape(const char *s, int *ch)
|
|
{
|
|
int n;
|
|
const char *s0 = s;
|
|
|
|
*ch = *s++;
|
|
|
|
switch (*ch) {
|
|
case 'b': *ch = '\b'; break;
|
|
case 'e': *ch = 27; break;
|
|
case 'f': *ch = '\f'; break;
|
|
case 'n': *ch = '\n'; break;
|
|
case 'r': *ch = '\r'; break;
|
|
case 't': *ch = '\t'; break;
|
|
case 'v': *ch = '\v'; break;
|
|
case 'u':
|
|
if (*s == '{') {
|
|
/* Expect \u{NNNN} */
|
|
n = parse_hex(s + 1, 6, ch);
|
|
if (n > 0 && s[n + 1] == '}' && *ch >= 0 && *ch <= 0x1fffff) {
|
|
s += n + 2;
|
|
}
|
|
else {
|
|
/* Invalid, so just treat as an escaped 'u' */
|
|
*ch = 'u';
|
|
}
|
|
}
|
|
else if ((n = parse_hex(s, 4, ch)) > 0) {
|
|
s += n;
|
|
}
|
|
break;
|
|
case 'U':
|
|
if ((n = parse_hex(s, 8, ch)) > 0) {
|
|
s += n;
|
|
}
|
|
break;
|
|
case 'x':
|
|
if ((n = parse_hex(s, 2, ch)) > 0) {
|
|
s += n;
|
|
}
|
|
break;
|
|
case '\0':
|
|
s--;
|
|
*ch = '\\';
|
|
break;
|
|
}
|
|
return s - s0;
|
|
}
|
|
|
|
/*
|
|
- regatom - the lowest level
|
|
*
|
|
* Optimization: gobbles an entire sequence of ordinary characters so that
|
|
* it can turn them into a single node, which is smaller to store and
|
|
* faster to run. Backslashed characters are exceptions, each becoming a
|
|
* separate node; the code is simpler that way and it's not worth fixing.
|
|
*/
|
|
static int regatom(regex_t *preg, int *flagp)
|
|
{
|
|
int ret;
|
|
int flags;
|
|
int nocase = (preg->cflags & REG_ICASE);
|
|
|
|
int ch;
|
|
int n = reg_utf8_tounicode_case(preg->regparse, &ch, nocase);
|
|
|
|
*flagp = WORST; /* Tentatively. */
|
|
|
|
preg->regparse += n;
|
|
switch (ch) {
|
|
/* FIXME: these chars only have meaning at beg/end of pat? */
|
|
case '^':
|
|
ret = regnode(preg, BOL);
|
|
break;
|
|
case '$':
|
|
ret = regnode(preg, EOL);
|
|
break;
|
|
case '.':
|
|
ret = regnode(preg, ANY);
|
|
*flagp |= HASWIDTH|SIMPLE;
|
|
break;
|
|
case '[': {
|
|
const char *pattern = preg->regparse;
|
|
|
|
if (*pattern == '^') { /* Complement of range. */
|
|
ret = regnode(preg, ANYBUT);
|
|
pattern++;
|
|
} else
|
|
ret = regnode(preg, ANYOF);
|
|
|
|
/* Special case. If the first char is ']' or '-', it is part of the set */
|
|
if (*pattern == ']' || *pattern == '-') {
|
|
reg_addrange(preg, *pattern, *pattern);
|
|
pattern++;
|
|
}
|
|
|
|
while (*pattern != ']') {
|
|
/* Is this a range? a-z */
|
|
int start;
|
|
int end;
|
|
|
|
enum {
|
|
CC_ALPHA, CC_ALNUM, CC_SPACE, CC_BLANK, CC_UPPER, CC_LOWER,
|
|
CC_DIGIT, CC_XDIGIT, CC_CNTRL, CC_GRAPH, CC_PRINT, CC_PUNCT,
|
|
CC_NUM
|
|
};
|
|
int cc;
|
|
|
|
if (!*pattern) {
|
|
preg->err = REG_ERR_UNMATCHED_BRACKET;
|
|
return 0;
|
|
}
|
|
|
|
pattern += reg_utf8_tounicode_case(pattern, &start, nocase);
|
|
if (start == '\\') {
|
|
/* First check for class shorthand escapes */
|
|
switch (*pattern) {
|
|
case 's':
|
|
pattern++;
|
|
cc = CC_SPACE;
|
|
goto cc_switch;
|
|
case 'd':
|
|
pattern++;
|
|
cc = CC_DIGIT;
|
|
goto cc_switch;
|
|
case 'w':
|
|
pattern++;
|
|
reg_addrange(preg, '_', '_');
|
|
cc = CC_ALNUM;
|
|
goto cc_switch;
|
|
}
|
|
pattern += reg_decode_escape(pattern, &start);
|
|
if (start == 0) {
|
|
preg->err = REG_ERR_NULL_CHAR;
|
|
return 0;
|
|
}
|
|
if (start == '\\' && *pattern == 0) {
|
|
preg->err = REG_ERR_INVALID_ESCAPE;
|
|
return 0;
|
|
}
|
|
}
|
|
if (pattern[0] == '-' && pattern[1] && pattern[1] != ']') {
|
|
/* skip '-' */
|
|
pattern += utf8_tounicode(pattern, &end);
|
|
pattern += reg_utf8_tounicode_case(pattern, &end, nocase);
|
|
if (end == '\\') {
|
|
pattern += reg_decode_escape(pattern, &end);
|
|
if (end == 0) {
|
|
preg->err = REG_ERR_NULL_CHAR;
|
|
return 0;
|
|
}
|
|
if (start == '\\' && *pattern == 0) {
|
|
preg->err = REG_ERR_INVALID_ESCAPE;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
reg_addrange(preg, start, end);
|
|
continue;
|
|
}
|
|
if (start == '[' && pattern[0] == ':') {
|
|
static const char *character_class[] = {
|
|
":alpha:", ":alnum:", ":space:", ":blank:", ":upper:", ":lower:",
|
|
":digit:", ":xdigit:", ":cntrl:", ":graph:", ":print:", ":punct:",
|
|
};
|
|
|
|
for (cc = 0; cc < CC_NUM; cc++) {
|
|
n = strlen(character_class[cc]);
|
|
if (strncmp(pattern, character_class[cc], n) == 0) {
|
|
/* Found a character class */
|
|
pattern += n + 1;
|
|
break;
|
|
}
|
|
}
|
|
if (cc != CC_NUM) {
|
|
cc_switch:
|
|
switch (cc) {
|
|
case CC_ALNUM:
|
|
reg_addrange(preg, '0', '9');
|
|
/* Fall through */
|
|
case CC_ALPHA:
|
|
if ((preg->cflags & REG_ICASE) == 0) {
|
|
reg_addrange(preg, 'a', 'z');
|
|
}
|
|
reg_addrange(preg, 'A', 'Z');
|
|
break;
|
|
case CC_SPACE:
|
|
reg_addrange_str(preg, " \t\r\n\f\v");
|
|
break;
|
|
case CC_BLANK:
|
|
reg_addrange_str(preg, " \t");
|
|
break;
|
|
case CC_UPPER:
|
|
reg_addrange(preg, 'A', 'Z');
|
|
break;
|
|
case CC_LOWER:
|
|
reg_addrange(preg, 'a', 'z');
|
|
break;
|
|
case CC_XDIGIT:
|
|
reg_addrange(preg, 'a', 'f');
|
|
reg_addrange(preg, 'A', 'F');
|
|
/* Fall through */
|
|
case CC_DIGIT:
|
|
reg_addrange(preg, '0', '9');
|
|
break;
|
|
case CC_CNTRL:
|
|
reg_addrange(preg, 0, 31);
|
|
reg_addrange(preg, 127, 127);
|
|
break;
|
|
case CC_PRINT:
|
|
reg_addrange(preg, ' ', '~');
|
|
break;
|
|
case CC_GRAPH:
|
|
reg_addrange(preg, '!', '~');
|
|
break;
|
|
case CC_PUNCT:
|
|
reg_addrange(preg, '!', '/');
|
|
reg_addrange(preg, ':', '@');
|
|
reg_addrange(preg, '[', '`');
|
|
reg_addrange(preg, '{', '~');
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
/* Not a range, so just add the char */
|
|
reg_addrange(preg, start, start);
|
|
}
|
|
regc(preg, '\0');
|
|
|
|
if (*pattern) {
|
|
pattern++;
|
|
}
|
|
preg->regparse = pattern;
|
|
|
|
*flagp |= HASWIDTH|SIMPLE;
|
|
}
|
|
break;
|
|
case '(':
|
|
ret = reg(preg, 1, &flags);
|
|
if (ret == 0)
|
|
return 0;
|
|
*flagp |= flags&(HASWIDTH|SPSTART);
|
|
break;
|
|
case '\0':
|
|
case '|':
|
|
case ')':
|
|
preg->err = REG_ERR_INTERNAL;
|
|
return 0; /* Supposed to be caught earlier. */
|
|
case '?':
|
|
case '+':
|
|
case '*':
|
|
case '{':
|
|
preg->err = REG_ERR_COUNT_FOLLOWS_NOTHING;
|
|
return 0;
|
|
case '\\':
|
|
ch = *preg->regparse++;
|
|
switch (ch) {
|
|
case '\0':
|
|
preg->err = REG_ERR_INVALID_ESCAPE;
|
|
return 0;
|
|
case 'A':
|
|
ret = regnode(preg, BOLX);
|
|
break;
|
|
case 'Z':
|
|
ret = regnode(preg, EOLX);
|
|
break;
|
|
case '<':
|
|
case 'm':
|
|
ret = regnode(preg, WORDA);
|
|
break;
|
|
case '>':
|
|
case 'M':
|
|
ret = regnode(preg, WORDZ);
|
|
break;
|
|
case 'd':
|
|
case 'D':
|
|
ret = regnode(preg, ch == 'd' ? ANYOF : ANYBUT);
|
|
reg_addrange(preg, '0', '9');
|
|
regc(preg, '\0');
|
|
*flagp |= HASWIDTH|SIMPLE;
|
|
break;
|
|
case 'w':
|
|
case 'W':
|
|
ret = regnode(preg, ch == 'w' ? ANYOF : ANYBUT);
|
|
if ((preg->cflags & REG_ICASE) == 0) {
|
|
reg_addrange(preg, 'a', 'z');
|
|
}
|
|
reg_addrange(preg, 'A', 'Z');
|
|
reg_addrange(preg, '0', '9');
|
|
reg_addrange(preg, '_', '_');
|
|
regc(preg, '\0');
|
|
*flagp |= HASWIDTH|SIMPLE;
|
|
break;
|
|
case 's':
|
|
case 'S':
|
|
ret = regnode(preg, ch == 's' ? ANYOF : ANYBUT);
|
|
reg_addrange_str(preg," \t\r\n\f\v");
|
|
regc(preg, '\0');
|
|
*flagp |= HASWIDTH|SIMPLE;
|
|
break;
|
|
/* FIXME: Someday handle \1, \2, ... */
|
|
default:
|
|
/* Handle general quoted chars in exact-match routine */
|
|
/* Back up to include the backslash */
|
|
preg->regparse--;
|
|
goto de_fault;
|
|
}
|
|
break;
|
|
de_fault:
|
|
default: {
|
|
/*
|
|
* Encode a string of characters to be matched exactly.
|
|
*/
|
|
int added = 0;
|
|
|
|
/* Back up to pick up the first char of interest */
|
|
preg->regparse -= n;
|
|
|
|
ret = regnode(preg, EXACTLY);
|
|
|
|
/* Note that a META operator such as ? or * consumes the
|
|
* preceding char.
|
|
* Thus we must be careful to look ahead by 2 and add the
|
|
* last char as it's own EXACTLY if necessary
|
|
*/
|
|
|
|
/* Until end of string or a META char is reached */
|
|
while (*preg->regparse && strchr(META, *preg->regparse) == NULL) {
|
|
n = reg_utf8_tounicode_case(preg->regparse, &ch, (preg->cflags & REG_ICASE));
|
|
if (ch == '\\' && preg->regparse[n]) {
|
|
/* Non-trailing backslash.
|
|
* Is this a special escape, or a regular escape?
|
|
*/
|
|
if (strchr("<>mMwWdDsSAZ", preg->regparse[n])) {
|
|
/* A special escape. All done with EXACTLY */
|
|
break;
|
|
}
|
|
/* Decode it. Note that we add the length for the escape
|
|
* sequence to the length for the backlash so we can skip
|
|
* the entire sequence, or not as required.
|
|
*/
|
|
n += reg_decode_escape(preg->regparse + n, &ch);
|
|
if (ch == 0) {
|
|
preg->err = REG_ERR_NULL_CHAR;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Now we have one char 'ch' of length 'n'.
|
|
* Check to see if the following char is a MULT
|
|
*/
|
|
|
|
if (ISMULT(preg->regparse[n])) {
|
|
/* Yes. But do we already have some EXACTLY chars? */
|
|
if (added) {
|
|
/* Yes, so return what we have and pick up the current char next time around */
|
|
break;
|
|
}
|
|
/* No, so add this single char and finish */
|
|
regc(preg, ch);
|
|
added++;
|
|
preg->regparse += n;
|
|
break;
|
|
}
|
|
|
|
/* No, so just add this char normally */
|
|
regc(preg, ch);
|
|
added++;
|
|
preg->regparse += n;
|
|
}
|
|
regc(preg, '\0');
|
|
|
|
*flagp |= HASWIDTH;
|
|
if (added == 1)
|
|
*flagp |= SIMPLE;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return(ret);
|
|
}
|
|
|
|
static void reg_grow(regex_t *preg, int n)
|
|
{
|
|
if (preg->p + n >= preg->proglen) {
|
|
preg->proglen = (preg->p + n) * 2;
|
|
preg->program = realloc(preg->program, preg->proglen * sizeof(int));
|
|
}
|
|
}
|
|
|
|
/*
|
|
- regnode - emit a node
|
|
*/
|
|
/* Location. */
|
|
static int regnode(regex_t *preg, int op)
|
|
{
|
|
reg_grow(preg, 2);
|
|
|
|
/* The OP followed by a next pointer */
|
|
preg->program[preg->p++] = op;
|
|
preg->program[preg->p++] = 0;
|
|
|
|
/* Return the start of the node */
|
|
return preg->p - 2;
|
|
}
|
|
|
|
/*
|
|
- regc - emit (if appropriate) a byte of code
|
|
*/
|
|
static void regc(regex_t *preg, int b )
|
|
{
|
|
reg_grow(preg, 1);
|
|
preg->program[preg->p++] = b;
|
|
}
|
|
|
|
/*
|
|
- reginsert - insert an operator in front of already-emitted operand
|
|
*
|
|
* Means relocating the operand.
|
|
* Returns the new location of the original operand.
|
|
*/
|
|
static int reginsert(regex_t *preg, int op, int size, int opnd )
|
|
{
|
|
reg_grow(preg, size);
|
|
|
|
/* Move everything from opnd up */
|
|
memmove(preg->program + opnd + size, preg->program + opnd, sizeof(int) * (preg->p - opnd));
|
|
/* Zero out the new space */
|
|
memset(preg->program + opnd, 0, sizeof(int) * size);
|
|
|
|
preg->program[opnd] = op;
|
|
|
|
preg->p += size;
|
|
|
|
return opnd + size;
|
|
}
|
|
|
|
/*
|
|
- regtail - set the next-pointer at the end of a node chain
|
|
*/
|
|
static void regtail(regex_t *preg, int p, int val)
|
|
{
|
|
int scan;
|
|
int temp;
|
|
int offset;
|
|
|
|
/* Find last node. */
|
|
scan = p;
|
|
for (;;) {
|
|
temp = regnext(preg, scan);
|
|
if (temp == 0)
|
|
break;
|
|
scan = temp;
|
|
}
|
|
|
|
if (OP(preg, scan) == BACK)
|
|
offset = scan - val;
|
|
else
|
|
offset = val - scan;
|
|
|
|
preg->program[scan + 1] = offset;
|
|
}
|
|
|
|
/*
|
|
- regoptail - regtail on operand of first argument; nop if operandless
|
|
*/
|
|
|
|
static void regoptail(regex_t *preg, int p, int val )
|
|
{
|
|
/* "Operandless" and "op != BRANCH" are synonymous in practice. */
|
|
if (p != 0 && OP(preg, p) == BRANCH) {
|
|
regtail(preg, OPERAND(p), val);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* regexec and friends
|
|
*/
|
|
|
|
/*
|
|
* Forwards.
|
|
*/
|
|
static int regtry(regex_t *preg, const char *string );
|
|
static int regmatch(regex_t *preg, int prog);
|
|
static int regrepeat(regex_t *preg, int p, int max);
|
|
|
|
/*
|
|
- regexec - match a regexp against a string
|
|
*/
|
|
int regexec(regex_t *preg, const char *string, size_t nmatch, regmatch_t pmatch[], int eflags)
|
|
{
|
|
const char *s;
|
|
int scan;
|
|
|
|
/* Be paranoid... */
|
|
if (preg == NULL || preg->program == NULL || string == NULL) {
|
|
return REG_ERR_NULL_ARGUMENT;
|
|
}
|
|
|
|
/* Check validity of program. */
|
|
if (*preg->program != REG_MAGIC) {
|
|
return REG_ERR_CORRUPTED;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
fprintf(stderr, "regexec: %s\n", string);
|
|
regdump(preg);
|
|
#endif
|
|
|
|
preg->eflags = eflags;
|
|
preg->pmatch = pmatch;
|
|
preg->nmatch = nmatch;
|
|
preg->start = string; /* All offsets are computed from here */
|
|
|
|
/* Must clear out the embedded repeat counts of REPX and REPXMIN opcodes */
|
|
for (scan = OPERAND(1); scan != 0; scan += regopsize(preg, scan)) {
|
|
int op = OP(preg, scan);
|
|
if (op == END)
|
|
break;
|
|
if (op == REPX || op == REPXMIN)
|
|
preg->program[scan + 4] = 0;
|
|
}
|
|
|
|
/* If there is a "must appear" string, look for it. */
|
|
if (preg->regmust != 0) {
|
|
s = string;
|
|
while ((s = str_find(s, preg->program[preg->regmust], preg->cflags & REG_ICASE)) != NULL) {
|
|
if (prefix_cmp(preg->program + preg->regmust, preg->regmlen, s, preg->cflags & REG_ICASE) >= 0) {
|
|
break;
|
|
}
|
|
s++;
|
|
}
|
|
if (s == NULL) /* Not present. */
|
|
return REG_NOMATCH;
|
|
}
|
|
|
|
/* Mark beginning of line for ^ . */
|
|
preg->regbol = string;
|
|
|
|
/* Simplest case: anchored match need be tried only once (maybe per line). */
|
|
if (preg->reganch) {
|
|
if (eflags & REG_NOTBOL) {
|
|
/* This is an anchored search, but not an BOL, so possibly skip to the next line */
|
|
goto nextline;
|
|
}
|
|
while (1) {
|
|
if (regtry(preg, string)) {
|
|
return REG_NOERROR;
|
|
}
|
|
if (*string) {
|
|
nextline:
|
|
if (preg->cflags & REG_NEWLINE) {
|
|
/* Try the next anchor? */
|
|
string = strchr(string, '\n');
|
|
if (string) {
|
|
preg->regbol = ++string;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
return REG_NOMATCH;
|
|
}
|
|
}
|
|
|
|
/* Messy cases: unanchored match. */
|
|
s = string;
|
|
if (preg->regstart != '\0') {
|
|
/* We know what char it must start with. */
|
|
while ((s = str_find(s, preg->regstart, preg->cflags & REG_ICASE)) != NULL) {
|
|
if (regtry(preg, s))
|
|
return REG_NOERROR;
|
|
s++;
|
|
}
|
|
}
|
|
else
|
|
/* We don't -- general case. */
|
|
while (1) {
|
|
if (regtry(preg, s))
|
|
return REG_NOERROR;
|
|
if (*s == '\0') {
|
|
break;
|
|
}
|
|
else {
|
|
int c;
|
|
s += utf8_tounicode(s, &c);
|
|
}
|
|
}
|
|
|
|
/* Failure. */
|
|
return REG_NOMATCH;
|
|
}
|
|
|
|
/*
|
|
- regtry - try match at specific point
|
|
*/
|
|
/* 0 failure, 1 success */
|
|
static int regtry( regex_t *preg, const char *string )
|
|
{
|
|
int i;
|
|
|
|
preg->reginput = string;
|
|
|
|
for (i = 0; i < preg->nmatch; i++) {
|
|
if (preg->pmatch) {
|
|
preg->pmatch[i].rm_so = -1;
|
|
preg->pmatch[i].rm_eo = -1;
|
|
}
|
|
}
|
|
if (regmatch(preg, 1)) {
|
|
if (preg->pmatch) {
|
|
preg->pmatch[0].rm_so = string - preg->start;
|
|
preg->pmatch[0].rm_eo = preg->reginput - preg->start;
|
|
}
|
|
return(1);
|
|
} else
|
|
return(0);
|
|
}
|
|
|
|
/**
|
|
* Returns bytes matched if 'pattern' is a prefix of 'string'.
|
|
*
|
|
* If 'nocase' is non-zero, does a case-insensitive match.
|
|
*
|
|
* Returns -1 on not found.
|
|
*/
|
|
static int prefix_cmp(const int *prog, int proglen, const char *string, int nocase)
|
|
{
|
|
const char *s = string;
|
|
while (proglen && *s) {
|
|
int ch;
|
|
int n = reg_utf8_tounicode_case(s, &ch, nocase);
|
|
if (ch != *prog) {
|
|
return -1;
|
|
}
|
|
prog++;
|
|
s += n;
|
|
proglen--;
|
|
}
|
|
if (proglen == 0) {
|
|
return s - string;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Searchs for 'c' in the range 'range'.
|
|
*
|
|
* Returns 1 if found, or 0 if not.
|
|
*/
|
|
static int reg_range_find(const int *range, int c)
|
|
{
|
|
while (*range) {
|
|
/*printf("Checking %d in range [%d,%d]\n", c, range[1], (range[0] + range[1] - 1));*/
|
|
if (c >= range[1] && c <= (range[0] + range[1] - 1)) {
|
|
return 1;
|
|
}
|
|
range += 2;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Search for the character 'c' in the utf-8 string 'string'.
|
|
*
|
|
* If 'nocase' is set, the 'string' is assumed to be uppercase
|
|
* and 'c' is converted to uppercase before matching.
|
|
*
|
|
* Returns the byte position in the string where the 'c' was found, or
|
|
* NULL if not found.
|
|
*/
|
|
static const char *str_find(const char *string, int c, int nocase)
|
|
{
|
|
if (nocase) {
|
|
/* The "string" should already be converted to uppercase */
|
|
c = utf8_upper(c);
|
|
}
|
|
while (*string) {
|
|
int ch;
|
|
int n = reg_utf8_tounicode_case(string, &ch, nocase);
|
|
if (c == ch) {
|
|
return string;
|
|
}
|
|
string += n;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* Returns true if 'ch' is an end-of-line char.
|
|
*
|
|
* In REG_NEWLINE mode, \n is considered EOL in
|
|
* addition to \0
|
|
*/
|
|
static int reg_iseol(regex_t *preg, int ch)
|
|
{
|
|
if (preg->cflags & REG_NEWLINE) {
|
|
return ch == '\0' || ch == '\n';
|
|
}
|
|
else {
|
|
return ch == '\0';
|
|
}
|
|
}
|
|
|
|
static int regmatchsimplerepeat(regex_t *preg, int scan, int matchmin)
|
|
{
|
|
int nextch = '\0';
|
|
const char *save;
|
|
int no;
|
|
int c;
|
|
|
|
int max = preg->program[scan + 2];
|
|
int min = preg->program[scan + 3];
|
|
int next = regnext(preg, scan);
|
|
|
|
/*
|
|
* Lookahead to avoid useless match attempts
|
|
* when we know what character comes next.
|
|
*/
|
|
if (OP(preg, next) == EXACTLY) {
|
|
nextch = preg->program[OPERAND(next)];
|
|
}
|
|
save = preg->reginput;
|
|
no = regrepeat(preg, scan + 5, max);
|
|
if (no < min) {
|
|
return 0;
|
|
}
|
|
if (matchmin) {
|
|
/* from min up to no */
|
|
max = no;
|
|
no = min;
|
|
}
|
|
/* else from no down to min */
|
|
while (1) {
|
|
if (matchmin) {
|
|
if (no > max) {
|
|
break;
|
|
}
|
|
}
|
|
else {
|
|
if (no < min) {
|
|
break;
|
|
}
|
|
}
|
|
preg->reginput = save + utf8_index(save, no);
|
|
reg_utf8_tounicode_case(preg->reginput, &c, (preg->cflags & REG_ICASE));
|
|
/* If it could work, try it. */
|
|
if (reg_iseol(preg, nextch) || c == nextch) {
|
|
if (regmatch(preg, next)) {
|
|
return(1);
|
|
}
|
|
}
|
|
if (matchmin) {
|
|
/* Couldn't or didn't, add one more */
|
|
no++;
|
|
}
|
|
else {
|
|
/* Couldn't or didn't -- back up. */
|
|
no--;
|
|
}
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
static int regmatchrepeat(regex_t *preg, int scan, int matchmin)
|
|
{
|
|
int *scanpt = preg->program + scan;
|
|
|
|
int max = scanpt[2];
|
|
int min = scanpt[3];
|
|
|
|
/* Have we reached min? */
|
|
if (scanpt[4] < min) {
|
|
/* No, so get another one */
|
|
scanpt[4]++;
|
|
if (regmatch(preg, scan + 5)) {
|
|
return 1;
|
|
}
|
|
scanpt[4]--;
|
|
return 0;
|
|
}
|
|
if (scanpt[4] > max) {
|
|
return 0;
|
|
}
|
|
|
|
if (matchmin) {
|
|
/* minimal, so try other branch first */
|
|
if (regmatch(preg, regnext(preg, scan))) {
|
|
return 1;
|
|
}
|
|
/* No, so try one more */
|
|
scanpt[4]++;
|
|
if (regmatch(preg, scan + 5)) {
|
|
return 1;
|
|
}
|
|
scanpt[4]--;
|
|
return 0;
|
|
}
|
|
/* maximal, so try this branch again */
|
|
if (scanpt[4] < max) {
|
|
scanpt[4]++;
|
|
if (regmatch(preg, scan + 5)) {
|
|
return 1;
|
|
}
|
|
scanpt[4]--;
|
|
}
|
|
/* At this point we are at max with no match. Try the other branch */
|
|
return regmatch(preg, regnext(preg, scan));
|
|
}
|
|
|
|
/*
|
|
- regmatch - main matching routine
|
|
*
|
|
* Conceptually the strategy is simple: check to see whether the current
|
|
* node matches, call self recursively to see whether the rest matches,
|
|
* and then act accordingly. In practice we make some effort to avoid
|
|
* recursion, in particular by going through "ordinary" nodes (that don't
|
|
* need to know whether the rest of the match failed) by a loop instead of
|
|
* by recursion.
|
|
*/
|
|
/* 0 failure, 1 success */
|
|
static int regmatch(regex_t *preg, int prog)
|
|
{
|
|
int scan; /* Current node. */
|
|
int next; /* Next node. */
|
|
const char *save;
|
|
|
|
scan = prog;
|
|
|
|
#ifdef DEBUG
|
|
if (scan != 0 && regnarrate)
|
|
fprintf(stderr, "%s(\n", regprop(scan));
|
|
#endif
|
|
while (scan != 0) {
|
|
int n;
|
|
int c;
|
|
#ifdef DEBUG
|
|
if (regnarrate) {
|
|
fprintf(stderr, "%3d: %s...\n", scan, regprop(OP(preg, scan))); /* Where, what. */
|
|
}
|
|
#endif
|
|
next = regnext(preg, scan);
|
|
n = reg_utf8_tounicode_case(preg->reginput, &c, (preg->cflags & REG_ICASE));
|
|
|
|
switch (OP(preg, scan)) {
|
|
case BOLX:
|
|
if ((preg->eflags & REG_NOTBOL)) {
|
|
return(0);
|
|
}
|
|
/* Fall through */
|
|
case BOL:
|
|
if (preg->reginput != preg->regbol) {
|
|
return(0);
|
|
}
|
|
break;
|
|
case EOLX:
|
|
if (c != 0) {
|
|
/* For EOLX, only match real end of line, not newline */
|
|
return 0;
|
|
}
|
|
break;
|
|
case EOL:
|
|
if (!reg_iseol(preg, c)) {
|
|
return(0);
|
|
}
|
|
break;
|
|
case WORDA:
|
|
/* Must be looking at a letter, digit, or _ */
|
|
if ((!isalnum(UCHAR(c))) && c != '_')
|
|
return(0);
|
|
/* Prev must be BOL or nonword */
|
|
if (preg->reginput > preg->regbol &&
|
|
(isalnum(UCHAR(preg->reginput[-1])) || preg->reginput[-1] == '_'))
|
|
return(0);
|
|
break;
|
|
case WORDZ:
|
|
/* Can't match at BOL */
|
|
if (preg->reginput > preg->regbol) {
|
|
/* Current must be EOL or nonword */
|
|
if (reg_iseol(preg, c) || !isalnum(UCHAR(c)) || c != '_') {
|
|
c = preg->reginput[-1];
|
|
/* Previous must be word */
|
|
if (isalnum(UCHAR(c)) || c == '_') {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
/* No */
|
|
return(0);
|
|
|
|
case ANY:
|
|
if (reg_iseol(preg, c))
|
|
return 0;
|
|
preg->reginput += n;
|
|
break;
|
|
case EXACTLY: {
|
|
int opnd;
|
|
int len;
|
|
int slen;
|
|
|
|
opnd = OPERAND(scan);
|
|
len = str_int_len(preg->program + opnd);
|
|
|
|
slen = prefix_cmp(preg->program + opnd, len, preg->reginput, preg->cflags & REG_ICASE);
|
|
if (slen < 0) {
|
|
return(0);
|
|
}
|
|
preg->reginput += slen;
|
|
}
|
|
break;
|
|
case ANYOF:
|
|
if (reg_iseol(preg, c) || reg_range_find(preg->program + OPERAND(scan), c) == 0) {
|
|
return(0);
|
|
}
|
|
preg->reginput += n;
|
|
break;
|
|
case ANYBUT:
|
|
if (reg_iseol(preg, c) || reg_range_find(preg->program + OPERAND(scan), c) != 0) {
|
|
return(0);
|
|
}
|
|
preg->reginput += n;
|
|
break;
|
|
case NOTHING:
|
|
break;
|
|
case BACK:
|
|
break;
|
|
case BRANCH:
|
|
if (OP(preg, next) != BRANCH) /* No choice. */
|
|
next = OPERAND(scan); /* Avoid recursion. */
|
|
else {
|
|
do {
|
|
save = preg->reginput;
|
|
if (regmatch(preg, OPERAND(scan))) {
|
|
return(1);
|
|
}
|
|
preg->reginput = save;
|
|
scan = regnext(preg, scan);
|
|
} while (scan != 0 && OP(preg, scan) == BRANCH);
|
|
return(0);
|
|
/* NOTREACHED */
|
|
}
|
|
break;
|
|
case REP:
|
|
case REPMIN:
|
|
return regmatchsimplerepeat(preg, scan, OP(preg, scan) == REPMIN);
|
|
|
|
case REPX:
|
|
case REPXMIN:
|
|
return regmatchrepeat(preg, scan, OP(preg, scan) == REPXMIN);
|
|
|
|
case END:
|
|
return 1; /* Success! */
|
|
|
|
case OPENNC:
|
|
case CLOSENC:
|
|
return regmatch(preg, next);
|
|
|
|
default:
|
|
if (OP(preg, scan) >= OPEN+1 && OP(preg, scan) < CLOSE_END) {
|
|
save = preg->reginput;
|
|
if (regmatch(preg, next)) {
|
|
if (OP(preg, scan) < CLOSE) {
|
|
int no = OP(preg, scan) - OPEN;
|
|
if (no < preg->nmatch && preg->pmatch && preg->pmatch[no].rm_so == -1) {
|
|
preg->pmatch[no].rm_so = save - preg->start;
|
|
}
|
|
}
|
|
else {
|
|
int no = OP(preg, scan) - CLOSE;
|
|
if (no < preg->nmatch && preg->pmatch && preg->pmatch[no].rm_eo == -1) {
|
|
preg->pmatch[no].rm_eo = save - preg->start;
|
|
}
|
|
}
|
|
return(1);
|
|
}
|
|
/* Restore input position after failure */
|
|
preg->reginput = save;
|
|
return(0);
|
|
}
|
|
return REG_ERR_INTERNAL;
|
|
}
|
|
|
|
scan = next;
|
|
}
|
|
|
|
/*
|
|
* We get here only if there's trouble -- normally "case END" is
|
|
* the terminating point.
|
|
*/
|
|
return REG_ERR_INTERNAL;
|
|
}
|
|
|
|
/*
|
|
- regrepeat - repeatedly match something simple, report how many
|
|
*/
|
|
static int regrepeat(regex_t *preg, int p, int max)
|
|
{
|
|
int count = 0;
|
|
const char *scan;
|
|
int opnd;
|
|
int ch;
|
|
int n;
|
|
|
|
scan = preg->reginput;
|
|
opnd = OPERAND(p);
|
|
switch (OP(preg, p)) {
|
|
case ANY:
|
|
while (!reg_iseol(preg, *scan) && count < max) {
|
|
count++;
|
|
scan += utf8_charlen(*scan);
|
|
}
|
|
break;
|
|
case EXACTLY:
|
|
while (count < max) {
|
|
n = reg_utf8_tounicode_case(scan, &ch, preg->cflags & REG_ICASE);
|
|
if (preg->program[opnd] != ch) {
|
|
break;
|
|
}
|
|
count++;
|
|
scan += n;
|
|
}
|
|
break;
|
|
case ANYOF:
|
|
while (count < max) {
|
|
n = reg_utf8_tounicode_case(scan, &ch, preg->cflags & REG_ICASE);
|
|
if (reg_iseol(preg, ch) || reg_range_find(preg->program + opnd, ch) == 0) {
|
|
break;
|
|
}
|
|
count++;
|
|
scan += n;
|
|
}
|
|
break;
|
|
case ANYBUT:
|
|
while (count < max) {
|
|
n = reg_utf8_tounicode_case(scan, &ch, preg->cflags & REG_ICASE);
|
|
if (reg_iseol(preg, ch) || reg_range_find(preg->program + opnd, ch) != 0) {
|
|
break;
|
|
}
|
|
count++;
|
|
scan += n;
|
|
}
|
|
break;
|
|
default: /* Oh dear. Called inappropriately. */
|
|
preg->err = REG_ERR_INTERNAL;
|
|
count = 0; /* Best compromise. */
|
|
break;
|
|
}
|
|
preg->reginput = scan;
|
|
|
|
return(count);
|
|
}
|
|
|
|
/*
|
|
- regnext - dig the "next" pointer out of a node
|
|
*/
|
|
static int regnext(regex_t *preg, int p )
|
|
{
|
|
int offset;
|
|
|
|
offset = NEXT(preg, p);
|
|
|
|
if (offset == 0)
|
|
return 0;
|
|
|
|
if (OP(preg, p) == BACK)
|
|
return(p-offset);
|
|
else
|
|
return(p+offset);
|
|
}
|
|
|
|
/*
|
|
- regopsize - returns the size of opcode + operands at 'p' in words
|
|
*/
|
|
static int regopsize(regex_t *preg, int p )
|
|
{
|
|
/* Almost all opcodes are 2 words, but some are more */
|
|
switch (OP(preg, p)) {
|
|
case REP:
|
|
case REPMIN:
|
|
case REPX:
|
|
case REPXMIN:
|
|
return 5;
|
|
|
|
case ANYOF:
|
|
case ANYBUT:
|
|
case EXACTLY: {
|
|
int s = p + 2;
|
|
while (preg->program[s++]) {
|
|
}
|
|
return s - p;
|
|
}
|
|
}
|
|
return 2;
|
|
}
|
|
|
|
#if defined(DEBUG) && !defined(JIM_BOOTSTRAP)
|
|
|
|
/*
|
|
- regdump - dump a regexp onto stdout in vaguely comprehensible form
|
|
*/
|
|
static void regdump(regex_t *preg)
|
|
{
|
|
int s;
|
|
int op = EXACTLY; /* Arbitrary non-END op. */
|
|
int next;
|
|
char buf[MAX_UTF8_LEN + 1];
|
|
|
|
int i;
|
|
for (i = 1; i < preg->p; i++) {
|
|
printf("%02x ", (unsigned char)preg->program[i]);
|
|
if (i % 16 == 0) {
|
|
printf("\n");
|
|
}
|
|
}
|
|
printf("\n");
|
|
|
|
s = 1;
|
|
while (op != END && s < preg->p) { /* While that wasn't END last time... */
|
|
op = OP(preg, s);
|
|
printf("%3d: %s", s, regprop(op)); /* Where, what. */
|
|
next = regnext(preg, s);
|
|
if (next == 0) /* Next ptr. */
|
|
printf("(0)");
|
|
else
|
|
printf("(%d)", next);
|
|
s += 2;
|
|
if (op == REP || op == REPMIN || op == REPX || op == REPXMIN) {
|
|
int max = preg->program[s];
|
|
int min = preg->program[s + 1];
|
|
if (max == 65535) {
|
|
printf("{%d,*}", min);
|
|
}
|
|
else {
|
|
printf("{%d,%d}", min, max);
|
|
}
|
|
printf(" %d", preg->program[s + 2]);
|
|
s += 3;
|
|
}
|
|
else if (op == ANYOF || op == ANYBUT) {
|
|
/* set of ranges */
|
|
|
|
while (preg->program[s]) {
|
|
int len = preg->program[s++];
|
|
int first = preg->program[s++];
|
|
buf[utf8_getchars(buf, first)] = 0;
|
|
printf("%s", buf);
|
|
if (len > 1) {
|
|
buf[utf8_getchars(buf, first + len - 1)] = 0;
|
|
printf("-%s", buf);
|
|
}
|
|
}
|
|
s++;
|
|
}
|
|
else if (op == EXACTLY) {
|
|
/* Literal string, where present. */
|
|
|
|
while (preg->program[s]) {
|
|
buf[utf8_getchars(buf, preg->program[s])] = 0;
|
|
printf("%s", buf);
|
|
s++;
|
|
}
|
|
s++;
|
|
}
|
|
putchar('\n');
|
|
}
|
|
|
|
if (op == END) {
|
|
/* Header fields of interest. */
|
|
if (preg->regstart) {
|
|
buf[utf8_getchars(buf, preg->regstart)] = 0;
|
|
printf("start '%s' ", buf);
|
|
}
|
|
if (preg->reganch)
|
|
printf("anchored ");
|
|
if (preg->regmust != 0) {
|
|
int i;
|
|
printf("must have:");
|
|
for (i = 0; i < preg->regmlen; i++) {
|
|
putchar(preg->program[preg->regmust + i]);
|
|
}
|
|
putchar('\n');
|
|
}
|
|
}
|
|
printf("\n");
|
|
}
|
|
|
|
/*
|
|
- regprop - printable representation of opcode
|
|
*/
|
|
static const char *regprop( int op )
|
|
{
|
|
static char buf[50];
|
|
|
|
switch (op) {
|
|
case BOL:
|
|
return "BOL";
|
|
case EOL:
|
|
return "EOL";
|
|
case BOLX:
|
|
return "BOLX";
|
|
case EOLX:
|
|
return "EOLX";
|
|
case ANY:
|
|
return "ANY";
|
|
case ANYOF:
|
|
return "ANYOF";
|
|
case ANYBUT:
|
|
return "ANYBUT";
|
|
case BRANCH:
|
|
return "BRANCH";
|
|
case EXACTLY:
|
|
return "EXACTLY";
|
|
case NOTHING:
|
|
return "NOTHING";
|
|
case BACK:
|
|
return "BACK";
|
|
case END:
|
|
return "END";
|
|
case REP:
|
|
return "REP";
|
|
case REPMIN:
|
|
return "REPMIN";
|
|
case REPX:
|
|
return "REPX";
|
|
case REPXMIN:
|
|
return "REPXMIN";
|
|
case WORDA:
|
|
return "WORDA";
|
|
case WORDZ:
|
|
return "WORDZ";
|
|
case OPENNC:
|
|
return "OPEN";
|
|
case CLOSENC:
|
|
return "CLOSE";
|
|
default:
|
|
if (op >= OPEN && op < CLOSE) {
|
|
snprintf(buf, sizeof(buf), "OPEN%d", op-OPEN);
|
|
}
|
|
else if (op >= CLOSE && op < CLOSE_END) {
|
|
snprintf(buf, sizeof(buf), "CLOSE%d", op-CLOSE);
|
|
}
|
|
else {
|
|
snprintf(buf, sizeof(buf), "?%d?\n", op);
|
|
}
|
|
return(buf);
|
|
}
|
|
}
|
|
#endif /* JIM_BOOTSTRAP */
|
|
|
|
size_t regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
|
|
{
|
|
static const char *error_strings[] = {
|
|
"success",
|
|
"no match",
|
|
"bad pattern",
|
|
"null argument",
|
|
"unknown error",
|
|
"too big",
|
|
"out of memory",
|
|
"too many ()",
|
|
"parentheses () not balanced",
|
|
"braces {} not balanced",
|
|
"invalid repetition count(s)",
|
|
"extra characters",
|
|
"*+ of empty atom",
|
|
"nested count",
|
|
"internal error",
|
|
"count follows nothing",
|
|
"invalid escape \\ sequence",
|
|
"corrupted program",
|
|
"contains null char",
|
|
"brackets [] not balanced",
|
|
};
|
|
const char *err;
|
|
|
|
(void)preg;
|
|
|
|
if (errcode < 0 || errcode >= REG_ERR_NUM) {
|
|
err = "Bad error code";
|
|
}
|
|
else {
|
|
err = error_strings[errcode];
|
|
}
|
|
|
|
return snprintf(errbuf, errbuf_size, "%s", err);
|
|
}
|
|
|
|
void regfree(regex_t *preg)
|
|
{
|
|
free(preg->program);
|
|
}
|
|
|
|
#endif
|