193 lines
6.7 KiB
C
193 lines
6.7 KiB
C
/*-
|
|
* Copyright (c) 1992, 1993, 1994 Henry Spencer.
|
|
* 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.
|
|
* 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
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* 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 unsigned long sop; /* strip operator */
|
|
typedef long sopno;
|
|
#define OPRMASK 0xf8000000L
|
|
#define OPDMASK 0x07ffffffL
|
|
#define OPSHIFT ((unsigned)27)
|
|
#define OP(n) ((n)&OPRMASK)
|
|
#define OPND(n) ((n)&OPDMASK)
|
|
#define SOP(op, opnd) ((op)|(opnd))
|
|
/* operators meaning operand */
|
|
/* (back, fwd are offsets) */
|
|
#define OEND (1L<<OPSHIFT) /* endmarker - */
|
|
#define OCHAR (2L<<OPSHIFT) /* character wide character */
|
|
#define OBOL (3L<<OPSHIFT) /* left anchor - */
|
|
#define OEOL (4L<<OPSHIFT) /* right anchor - */
|
|
#define OANY (5L<<OPSHIFT) /* . - */
|
|
#define OANYOF (6L<<OPSHIFT) /* [...] set number */
|
|
#define OBACK_ (7L<<OPSHIFT) /* begin \d paren number */
|
|
#define O_BACK (8L<<OPSHIFT) /* end \d paren number */
|
|
#define OPLUS_ (9L<<OPSHIFT) /* + prefix fwd to suffix */
|
|
#define O_PLUS (10L<<OPSHIFT) /* + suffix back to prefix */
|
|
#define OQUEST_ (11L<<OPSHIFT) /* ? prefix fwd to suffix */
|
|
#define O_QUEST (12L<<OPSHIFT) /* ? suffix back to prefix */
|
|
#define OLPAREN (13L<<OPSHIFT) /* ( fwd to ) */
|
|
#define ORPAREN (14L<<OPSHIFT) /* ) back to ( */
|
|
#define OCH_ (15L<<OPSHIFT) /* begin choice fwd to OOR2 */
|
|
#define OOR1 (16L<<OPSHIFT) /* | pt. 1 back to OOR1 or OCH_ */
|
|
#define OOR2 (17L<<OPSHIFT) /* | pt. 2 fwd to OOR2 or O_CH */
|
|
#define O_CH (18L<<OPSHIFT) /* end choice back to OOR1 */
|
|
#define OBOW (19L<<OPSHIFT) /* begin word - */
|
|
#define OEOW (20L<<OPSHIFT) /* end word - */
|
|
|
|
/*
|
|
* Structures for [] character-set representation.
|
|
*/
|
|
typedef struct {
|
|
wint_t min;
|
|
wint_t max;
|
|
} crange;
|
|
typedef struct {
|
|
unsigned char bmp[NC / 8];
|
|
wctype_t *types;
|
|
int ntypes;
|
|
wint_t *wides;
|
|
int nwides;
|
|
crange *ranges;
|
|
int nranges;
|
|
int invert;
|
|
int icase;
|
|
} cset;
|
|
|
|
static int
|
|
CHIN1(cset *cs, wint_t ch)
|
|
{
|
|
int i;
|
|
|
|
assert(ch >= 0);
|
|
if (ch < NC)
|
|
return (((cs->bmp[ch >> 3] & (1 << (ch & 7))) != 0) ^
|
|
cs->invert);
|
|
for (i = 0; i < cs->nwides; i++)
|
|
if (ch == cs->wides[i])
|
|
return (!cs->invert);
|
|
for (i = 0; i < cs->nranges; i++)
|
|
if (cs->ranges[i].min <= ch && ch <= cs->ranges[i].max)
|
|
return (!cs->invert);
|
|
for (i = 0; i < cs->ntypes; i++)
|
|
if (iswctype(ch, cs->types[i]))
|
|
return (!cs->invert);
|
|
return (cs->invert);
|
|
}
|
|
|
|
static __inline int
|
|
CHIN(cset *cs, wint_t ch)
|
|
{
|
|
|
|
assert(ch >= 0);
|
|
if (ch < NC)
|
|
return (((cs->bmp[ch >> 3] & (1 << (ch & 7))) != 0) ^
|
|
cs->invert);
|
|
else if (cs->icase)
|
|
return (CHIN1(cs, ch) || CHIN1(cs, towlower(ch)) ||
|
|
CHIN1(cs, towupper(ch)));
|
|
else
|
|
return (CHIN1(cs, ch));
|
|
}
|
|
|
|
/*
|
|
* main compiled-expression structure
|
|
*/
|
|
struct re_guts {
|
|
int magic;
|
|
# define MAGIC2 ((('R'^0200)<<8)|'E')
|
|
sop *strip; /* malloced area for strip */
|
|
int ncsets; /* number of csets in use */
|
|
cset *sets; /* -> cset [ncsets] */
|
|
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 */
|
|
char *must; /* match must contain this string */
|
|
int moffset; /* latest point at which must may be located */
|
|
int *charjump; /* Boyer-Moore char jump table */
|
|
int *matchjump; /* Boyer-Moore match jump table */
|
|
int mlen; /* length of must */
|
|
size_t nsub; /* copy of re_nsub */
|
|
int backrefs; /* does it use back references? */
|
|
sopno nplus; /* how deep does it nest +s? */
|
|
};
|
|
|
|
/* misc utilities */
|
|
#define OUT (CHAR_MIN - 1) /* a non-character value */
|
|
#define ISWORD(c) (iswalnum((uch)(c)) || (c) == '_')
|