1273459Strasz/*- 2332595Strasz * This code is derived from OpenBSD's libc/regex, original license follows: 3332595Strasz * 4273459Strasz * Copyright (c) 1992, 1993, 1994 Henry Spencer. 5273459Strasz * Copyright (c) 1992, 1993, 1994 6273459Strasz * The Regents of the University of California. All rights reserved. 7273459Strasz * 8273459Strasz * This code is derived from software contributed to Berkeley by 9273459Strasz * Henry Spencer. 10273459Strasz * 11273459Strasz * Redistribution and use in source and binary forms, with or without 12273459Strasz * modification, are permitted provided that the following conditions 13273459Strasz * are met: 14273459Strasz * 1. Redistributions of source code must retain the above copyright 15273459Strasz * notice, this list of conditions and the following disclaimer. 16273459Strasz * 2. Redistributions in binary form must reproduce the above copyright 17273459Strasz * notice, this list of conditions and the following disclaimer in the 18273459Strasz * documentation and/or other materials provided with the distribution. 19273459Strasz * 3. Neither the name of the University nor the names of its contributors 20273459Strasz * may be used to endorse or promote products derived from this software 21273459Strasz * without specific prior written permission. 22273459Strasz * 23273459Strasz * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24273459Strasz * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25273459Strasz * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26273459Strasz * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27273459Strasz * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28273459Strasz * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29273459Strasz * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30273459Strasz * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31273459Strasz * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32273459Strasz * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33273459Strasz * SUCH DAMAGE. 34273459Strasz * 35273459Strasz * @(#)regex2.h 8.4 (Berkeley) 3/20/94 36273459Strasz */ 37285086Strasz 38273459Strasz/* 39274328Smav * internals of regex_t 40274328Smav */ 41285086Strasz#define MAGIC1 ((('r'^0200)<<8) | 'e') 42273459Strasz 43273459Strasz/* 44273459Strasz * The internal representation is a *strip*, a sequence of 45273459Strasz * operators ending with an endmarker. (Some terminology etc. is a 46273459Strasz * historical relic of earlier versions which used multiple strips.) 47273459Strasz * Certain oddities in the representation are there to permit running 48273459Strasz * the machinery backwards; in particular, any deviation from sequential 49273459Strasz * flow must be marked at both its source and its destination. Some 50273459Strasz * fine points: 51273459Strasz * 52285086Strasz * - OPLUS_ and O_PLUS are *inside* the loop they create. 53273459Strasz * - OQUEST_ and O_QUEST are *outside* the bypass they create. 54285086Strasz * - OCH_ and O_CH are *outside* the multi-way branch they create, while 55285086Strasz * OOR1 and OOR2 are respectively the end and the beginning of one of 56285086Strasz * the branches. Note that there is an implicit OOR2 following OCH_ 57285086Strasz * and an implicit OOR1 preceding O_CH. 58285086Strasz * 59273459Strasz * In state representations, an operator's bit is on to signify a state 60273459Strasz * immediately *preceding* "execution" of that operator. 61273459Strasz */ 62273459Strasztypedef unsigned long sop; /* strip operator */ 63273459Strasztypedef long sopno; 64273459Strasz#define OPRMASK 0xf8000000LU 65273459Strasz#define OPDMASK 0x07ffffffLU 66273459Strasz#define OPSHIFT ((unsigned)27) 67273459Strasz#define OP(n) ((n)&OPRMASK) 68273459Strasz#define OPND(n) ((n)&OPDMASK) 69273459Strasz#define SOP(op, opnd) ((op)|(opnd)) 70273459Strasz/* operators meaning operand */ 71273459Strasz/* (back, fwd are offsets) */ 72273459Strasz#define OEND (1LU<<OPSHIFT) /* endmarker - */ 73273459Strasz#define OCHAR (2LU<<OPSHIFT) /* character unsigned char */ 74273459Strasz#define OBOL (3LU<<OPSHIFT) /* left anchor - */ 75273459Strasz#define OEOL (4LU<<OPSHIFT) /* right anchor - */ 76273459Strasz#define OANY (5LU<<OPSHIFT) /* . - */ 77273459Strasz#define OANYOF (6LU<<OPSHIFT) /* [...] set number */ 78273459Strasz#define OBACK_ (7LU<<OPSHIFT) /* begin \d paren number */ 79273459Strasz#define O_BACK (8LU<<OPSHIFT) /* end \d paren number */ 80273459Strasz#define OPLUS_ (9LU<<OPSHIFT) /* + prefix fwd to suffix */ 81273459Strasz#define O_PLUS (10LU<<OPSHIFT) /* + suffix back to prefix */ 82273459Strasz#define OQUEST_ (11LU<<OPSHIFT) /* ? prefix fwd to suffix */ 83273459Strasz#define O_QUEST (12LU<<OPSHIFT) /* ? suffix back to prefix */ 84273459Strasz#define OLPAREN (13LU<<OPSHIFT) /* ( fwd to ) */ 85273459Strasz#define ORPAREN (14LU<<OPSHIFT) /* ) back to ( */ 86273459Strasz#define OCH_ (15LU<<OPSHIFT) /* begin choice fwd to OOR2 */ 87273459Strasz#define OOR1 (16LU<<OPSHIFT) /* | pt. 1 back to OOR1 or OCH_ */ 88273459Strasz#define OOR2 (17LU<<OPSHIFT) /* | pt. 2 fwd to OOR2 or O_CH */ 89273459Strasz#define O_CH (18LU<<OPSHIFT) /* end choice back to OOR1 */ 90273459Strasz#define OBOW (19LU<<OPSHIFT) /* begin word - */ 91273459Strasz#define OEOW (20LU<<OPSHIFT) /* end word - */ 92273459Strasz 93273459Strasz/* 94273459Strasz * Structure for [] character-set representation. Character sets are 95273459Strasz * done as bit vectors, grouped 8 to a byte vector for compactness. 96273459Strasz * The individual set therefore has both a pointer to the byte vector 97273459Strasz * and a mask to pick out the relevant bit of each byte. A hash code 98273459Strasz * simplifies testing whether two sets could be identical. 99273459Strasz * 100273459Strasz * This will get trickier for multicharacter collating elements. As 101273459Strasz * preliminary hooks for dealing with such things, we also carry along 102273459Strasz * a string of multi-character elements, and decide the size of the 103273459Strasz * vectors at run time. 104273459Strasz */ 105273459Strasztypedef struct { 106273459Strasz uch *ptr; /* -> uch [csetsize] */ 107273459Strasz uch mask; /* bit within array */ 108274328Smav uch hash; /* hash code */ 109274328Smav size_t smultis; 110274328Smav char *multis; /* -> char[smulti] ab\0cd\0ef\0\0 */ 111274328Smav} cset; 112274328Smav/* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */ 113274328Smav#define CHadd(cs, c) ((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (c)) 114274328Smav#define CHsub(cs, c) ((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (c)) 115274328Smav#define CHIN(cs, c) ((cs)->ptr[(uch)(c)] & (cs)->mask) 116274328Smav#define MCadd(p, cs, cp) mcadd(p, cs, cp) /* llvm_regcomp() internal fns */ 117274328Smav#define MCsub(p, cs, cp) mcsub(p, cs, cp) 118274328Smav#define MCin(p, cs, cp) mcin(p, cs, cp) 119274328Smav 120274328Smav/* stuff for character categories */ 121274328Smavtypedef unsigned char cat_t; 122274328Smav 123274328Smav/* 124274328Smav * main compiled-expression structure 125274328Smav */ 126274328Smavstruct re_guts { 127274328Smav int magic; 128274328Smav# define MAGIC2 ((('R'^0200)<<8)|'E') 129274328Smav sop *strip; /* malloced area for strip */ 130274328Smav int csetsize; /* number of bits in a cset vector */ 131273459Strasz int ncsets; /* number of csets in use */ 132273459Strasz cset *sets; /* -> cset [ncsets] */ 133273459Strasz uch *setbits; /* -> uch[csetsize][ncsets/CHAR_BIT] */ 134273459Strasz int cflags; /* copy of llvm_regcomp() cflags argument */ 135273459Strasz sopno nstates; /* = number of sops */ 136273459Strasz sopno firststate; /* the initial OEND (normally 0) */ 137273459Strasz sopno laststate; /* the final OEND */ 138273459Strasz int iflags; /* internal flags */ 139273459Strasz# define USEBOL 01 /* used ^ */ 140273459Strasz# define USEEOL 02 /* used $ */ 141273459Strasz# define REGEX_BAD 04 /* something wrong */ 142274328Smav int nbol; /* number of ^ used */ 143274328Smav int neol; /* number of $ used */ 144274328Smav int ncategories; /* how many character categories */ 145273459Strasz cat_t *categories; /* ->catspace[-CHAR_MIN] */ 146274328Smav char *must; /* match must contain this string */ 147274328Smav int mlen; /* length of must */ 148273459Strasz size_t nsub; /* copy of re_nsub */ 149273459Strasz int backrefs; /* does it use back references? */ 150273459Strasz sopno nplus; /* how deep does it nest +s? */ 151273459Strasz /* catspace must be last */ 152273459Strasz cat_t catspace[1]; /* actually [NC] */ 153273459Strasz}; 154273459Strasz 155273459Strasz/* misc utilities */ 156273459Strasz#define OUT (CHAR_MAX+1) /* a non-character value */ 157273459Strasz#define ISWORD(c) (isalnum(c&0xff) || (c) == '_') 158273459Strasz