210 lines
8.8 KiB
C
210 lines
8.8 KiB
C
/* $NetBSD: regex2.h,v 1.10 2003/08/07 16:43:20 agc Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1992, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Henry Spencer.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)regex2.h 8.4 (Berkeley) 3/20/94
|
|
*/
|
|
|
|
/*-
|
|
* Copyright (c) 1992, 1993, 1994 Henry Spencer.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Henry Spencer.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)regex2.h 8.4 (Berkeley) 3/20/94
|
|
*/
|
|
|
|
/*
|
|
* First, the stuff that ends up in the outside-world include file
|
|
= typedef off_t regoff_t;
|
|
= typedef struct {
|
|
= int re_magic;
|
|
= size_t re_nsub; // number of parenthesized subexpressions
|
|
= const char *re_endp; // end pointer for REG_PEND
|
|
= struct re_guts *re_g; // none of your business :-)
|
|
= } regex_t;
|
|
= typedef struct {
|
|
= regoff_t rm_so; // start of match
|
|
= regoff_t rm_eo; // end of match
|
|
= } regmatch_t;
|
|
*/
|
|
/*
|
|
* internals of regex_t
|
|
*/
|
|
#define MAGIC1 ((('r'^0200)<<8) | 'e')
|
|
|
|
/*
|
|
* The internal representation is a *strip*, a sequence of
|
|
* operators ending with an endmarker. (Some terminology etc. is a
|
|
* historical relic of earlier versions which used multiple strips.)
|
|
* Certain oddities in the representation are there to permit running
|
|
* the machinery backwards; in particular, any deviation from sequential
|
|
* flow must be marked at both its source and its destination. Some
|
|
* fine points:
|
|
*
|
|
* - OPLUS_ and O_PLUS are *inside* the loop they create.
|
|
* - OQUEST_ and O_QUEST are *outside* the bypass they create.
|
|
* - OCH_ and O_CH are *outside* the multi-way branch they create, while
|
|
* OOR1 and OOR2 are respectively the end and the beginning of one of
|
|
* the branches. Note that there is an implicit OOR2 following OCH_
|
|
* and an implicit OOR1 preceding O_CH.
|
|
*
|
|
* In state representations, an operator's bit is on to signify a state
|
|
* immediately *preceding* "execution" of that operator.
|
|
*/
|
|
typedef u_int32_t sop; /* strip operator */
|
|
typedef int sopno;
|
|
#define OPRMASK ((u_int32_t)0xf8000000UL)
|
|
#define OPDMASK ((u_int32_t)0x07ffffffUL)
|
|
#define OPSHIFT ((unsigned)27)
|
|
#define OP(n) ((n)&OPRMASK)
|
|
#define OPND(n) ((int)((n)&OPDMASK))
|
|
#define SOP(op, opnd) ((op)|(opnd))
|
|
|
|
#define OPC(n) (((u_int32_t)(n))<<OPSHIFT)
|
|
/* operators meaning operand */
|
|
/* (back, fwd are offsets) */
|
|
#define OEND OPC(1) /* endmarker - */
|
|
#define OCHAR OPC(2) /* character unsigned char */
|
|
#define OBOL OPC(3) /* left anchor - */
|
|
#define OEOL OPC(4) /* right anchor - */
|
|
#define OANY OPC(5) /* . - */
|
|
#define OANYOF OPC(6) /* [...] set number */
|
|
#define OBACK_ OPC(7) /* begin \d paren number */
|
|
#define O_BACK OPC(8) /* end \d paren number */
|
|
#define OPLUS_ OPC(9) /* + prefix fwd to suffix */
|
|
#define O_PLUS OPC(10) /* + suffix back to prefix */
|
|
#define OQUEST_ OPC(11) /* ? prefix fwd to suffix */
|
|
#define O_QUEST OPC(12) /* ? suffix back to prefix */
|
|
#define OLPAREN OPC(13) /* ( fwd to ) */
|
|
#define ORPAREN OPC(14) /* ) back to ( */
|
|
#define OCH_ OPC(15) /* begin choice fwd to OOR2 */
|
|
#define OOR1 OPC(16) /* | pt. 1 back to OOR1 or OCH_ */
|
|
#define OOR2 OPC(17) /* | pt. 2 fwd to OOR2 or O_CH */
|
|
#define O_CH OPC(18) /* end choice back to OOR1 */
|
|
#define OBOW OPC(19) /* begin word - */
|
|
#define OEOW OPC(20) /* end word - */
|
|
|
|
/*
|
|
* Structure for [] character-set representation. Character sets are
|
|
* done as bit vectors, grouped 8 to a byte vector for compactness.
|
|
* The individual set therefore has both a pointer to the byte vector
|
|
* and a mask to pick out the relevant bit of each byte. A hash code
|
|
* simplifies testing whether two sets could be identical.
|
|
*
|
|
* This will get trickier for multicharacter collating elements. As
|
|
* preliminary hooks for dealing with such things, we also carry along
|
|
* a string of multi-character elements, and decide the size of the
|
|
* vectors at run time.
|
|
*/
|
|
typedef struct {
|
|
uch *ptr; /* -> uch [csetsize] */
|
|
uch mask; /* bit within array */
|
|
uch hash; /* hash code */
|
|
size_t smultis;
|
|
char *multis; /* -> char[smulti] ab\0cd\0ef\0\0 */
|
|
} cset;
|
|
/* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */
|
|
#define CHadd(cs, c) ((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (c))
|
|
#define CHsub(cs, c) ((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (c))
|
|
#define CHIN(cs, c) ((cs)->ptr[(uch)(c)] & (cs)->mask)
|
|
#define MCadd(p, cs, cp) mcadd(p, cs, cp) /* regcomp() internal fns */
|
|
#define MCsub(p, cs, cp) mcsub(p, cs, cp)
|
|
#define MCin(p, cs, cp) mcin(p, cs, cp)
|
|
|
|
/* stuff for character categories */
|
|
typedef unsigned char cat_t;
|
|
|
|
/*
|
|
* main compiled-expression structure
|
|
*/
|
|
struct re_guts {
|
|
int magic;
|
|
# define MAGIC2 ((('R'^0200)<<8)|'E')
|
|
sop *strip; /* malloced area for strip */
|
|
int csetsize; /* number of bits in a cset vector */
|
|
int ncsets; /* number of csets in use */
|
|
cset *sets; /* -> cset [ncsets] */
|
|
uch *setbits; /* -> uch[csetsize][ncsets/CHAR_BIT] */
|
|
int cflags; /* copy of regcomp() cflags argument */
|
|
sopno nstates; /* = number of sops */
|
|
sopno firststate; /* the initial OEND (normally 0) */
|
|
sopno laststate; /* the final OEND */
|
|
int iflags; /* internal flags */
|
|
# define USEBOL 01 /* used ^ */
|
|
# define USEEOL 02 /* used $ */
|
|
# define BAD 04 /* something wrong */
|
|
int nbol; /* number of ^ used */
|
|
int neol; /* number of $ used */
|
|
int ncategories; /* how many character categories */
|
|
cat_t *categories; /* ->catspace[-CHAR_MIN] */
|
|
char *must; /* match must contain this string */
|
|
int mlen; /* length of must */
|
|
sopno nsub; /* copy of re_nsub */
|
|
int backrefs; /* does it use back references? */
|
|
sopno nplus; /* how deep does it nest +s? */
|
|
/* catspace must be last */
|
|
cat_t catspace[1]; /* actually [NC] */
|
|
};
|
|
|
|
/* misc utilities */
|
|
#define OUT (CHAR_MAX+1) /* a non-character value */
|
|
#define ISWORD(c) (isalnum(c) || (c) == '_')
|