162 lines
6.2 KiB
C
162 lines
6.2 KiB
C
/* $OpenBSD: regex2.h,v 1.12 2021/01/03 17:07:58 tb Exp $ */
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/*-
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* Copyright (c) 1992, 1993, 1994 Henry Spencer.
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Henry Spencer.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)regex2.h 8.4 (Berkeley) 3/20/94
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*/
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/*
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* internals of regex_t
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*/
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#define MAGIC1 ((('r'^0200)<<8) | 'e')
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/*
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* The internal representation is a *strip*, a sequence of
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* operators ending with an endmarker. (Some terminology etc. is a
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* historical relic of earlier versions which used multiple strips.)
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* Certain oddities in the representation are there to permit running
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* the machinery backwards; in particular, any deviation from sequential
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* flow must be marked at both its source and its destination. Some
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* fine points:
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*
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* - OPLUS_ and O_PLUS are *inside* the loop they create.
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* - OQUEST_ and O_QUEST are *outside* the bypass they create.
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* - OCH_ and O_CH are *outside* the multi-way branch they create, while
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* OOR1 and OOR2 are respectively the end and the beginning of one of
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* the branches. Note that there is an implicit OOR2 following OCH_
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* and an implicit OOR1 preceding O_CH.
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*
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* In state representations, an operator's bit is on to signify a state
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* immediately *preceding* "execution" of that operator.
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*/
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typedef unsigned long sop; /* strip operator */
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typedef long sopno;
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#define OPRMASK 0xf8000000LU
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#define OPDMASK 0x07ffffffLU
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#define OPSHIFT ((unsigned)27)
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#define OP(n) ((n)&OPRMASK)
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#define OPND(n) ((n)&OPDMASK)
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#define SOP(op, opnd) ((op)|(opnd))
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/* operators meaning operand */
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/* (back, fwd are offsets) */
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#define OEND (1LU<<OPSHIFT) /* endmarker - */
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#define OCHAR (2LU<<OPSHIFT) /* character unsigned char */
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#define OBOL (3LU<<OPSHIFT) /* left anchor - */
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#define OEOL (4LU<<OPSHIFT) /* right anchor - */
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#define OANY (5LU<<OPSHIFT) /* . - */
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#define OANYOF (6LU<<OPSHIFT) /* [...] set number */
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#define OBACK_ (7LU<<OPSHIFT) /* begin \d paren number */
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#define O_BACK (8LU<<OPSHIFT) /* end \d paren number */
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#define OPLUS_ (9LU<<OPSHIFT) /* + prefix fwd to suffix */
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#define O_PLUS (10LU<<OPSHIFT) /* + suffix back to prefix */
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#define OQUEST_ (11LU<<OPSHIFT) /* ? prefix fwd to suffix */
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#define O_QUEST (12LU<<OPSHIFT) /* ? suffix back to prefix */
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#define OLPAREN (13LU<<OPSHIFT) /* ( fwd to ) */
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#define ORPAREN (14LU<<OPSHIFT) /* ) back to ( */
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#define OCH_ (15LU<<OPSHIFT) /* begin choice fwd to OOR2 */
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#define OOR1 (16LU<<OPSHIFT) /* | pt. 1 back to OOR1 or OCH_ */
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#define OOR2 (17LU<<OPSHIFT) /* | pt. 2 fwd to OOR2 or O_CH */
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#define O_CH (18LU<<OPSHIFT) /* end choice back to OOR1 */
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#define OBOW (19LU<<OPSHIFT) /* begin word - */
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#define OEOW (20LU<<OPSHIFT) /* end word - */
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/*
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* Structure for [] character-set representation. Character sets are
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* done as bit vectors, grouped 8 to a byte vector for compactness.
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* The individual set therefore has both a pointer to the byte vector
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* and a mask to pick out the relevant bit of each byte. A hash code
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* simplifies testing whether two sets could be identical.
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*
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* This will get trickier for multicharacter collating elements. As
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* preliminary hooks for dealing with such things, we also carry along
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* a string of multi-character elements, and decide the size of the
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* vectors at run time.
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*/
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typedef struct {
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uch *ptr; /* -> uch [csetsize] */
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uch mask; /* bit within array */
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uch hash; /* hash code */
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} cset;
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static inline void
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CHadd(cset *cs, char c)
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{
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cs->ptr[(uch)c] |= cs->mask;
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cs->hash += c;
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}
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static inline void
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CHsub(cset *cs, char c)
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{
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cs->ptr[(uch)c] &= ~cs->mask;
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cs->hash -= c;
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}
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static inline int
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CHIN(const cset *cs, char c)
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{
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return (cs->ptr[(uch)c] & cs->mask) != 0;
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}
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/*
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* main compiled-expression structure
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*/
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struct re_guts {
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# define MAGIC2 ((('R'^0200)<<8)|'E')
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sop *strip; /* malloced area for strip */
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cset *sets; /* -> cset [ncsets] */
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uch *setbits; /* -> uch[csetsize][ncsets/CHAR_BIT] */
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int magic;
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int csetsize; /* number of bits in a cset vector */
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int ncsets; /* number of csets in use */
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int cflags; /* copy of regcomp() cflags argument */
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sopno nstates; /* = number of sops */
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sopno firststate; /* the initial OEND (normally 0) */
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sopno laststate; /* the final OEND */
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int iflags; /* internal flags */
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# define USEBOL 01 /* used ^ */
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# define USEEOL 02 /* used $ */
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# define REGEX_BAD 04 /* something wrong */
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int nbol; /* number of ^ used */
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int neol; /* number of $ used */
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char *must; /* match must contain this string */
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int mlen; /* length of must */
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int backrefs; /* does it use back references? */
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size_t nsub; /* copy of re_nsub */
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sopno nplus; /* how deep does it nest +s? */
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};
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/* misc utilities */
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#define OUT (CHAR_MAX+1) /* a non-character value */
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#define ISWORD(c) (isalnum((c)&0xff) || (c) == '_')
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