| 1 | /*-
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| 2 | * Copyright (c) 1992, 1993, 1994 Henry Spencer.
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| 3 | * Copyright (c) 1992, 1993, 1994
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| 4 | * The Regents of the University of California. All rights reserved.
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| 5 | *
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| 6 | * This code is derived from software contributed to Berkeley by
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| 7 | * Henry Spencer.
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| 8 | *
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| 9 | * Redistribution and use in source and binary forms, with or without
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| 10 | * modification, are permitted provided that the following conditions
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| 11 | * are met:
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| 12 | * 1. Redistributions of source code must retain the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer.
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| 14 | * 2. Redistributions in binary form must reproduce the above copyright
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| 15 | * notice, this list of conditions and the following disclaimer in the
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| 16 | * documentation and/or other materials provided with the distribution.
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| 17 | * 3. All advertising materials mentioning features or use of this software
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| 18 | * must display the following acknowledgement:
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| 19 | * This product includes software developed by the University of
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| 20 | * California, Berkeley and its contributors.
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| 21 | * 4. Neither the name of the University nor the names of its contributors
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| 22 | * may be used to endorse or promote products derived from this software
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| 23 | * without specific prior written permission.
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| 24 | *
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| 25 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 30 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 31 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 32 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 34 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 35 | * SUCH DAMAGE.
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| 36 | *
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| 37 | * @(#)regex2.h 8.4 (Berkeley) 3/20/94
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| 38 | */
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| 39 |
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| 40 | /*
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| 41 | * First, the stuff that ends up in the outside-world include file
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| 42 | = typedef off_t regoff_t;
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| 43 | = typedef struct {
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| 44 | = int re_magic;
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| 45 | = size_t re_nsub; // number of parenthesized subexpressions
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| 46 | = const char *re_endp; // end pointer for REG_PEND
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| 47 | = struct re_guts *re_g; // none of your business :-)
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| 48 | = } regex_t;
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| 49 | = typedef struct {
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| 50 | = regoff_t rm_so; // start of match
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| 51 | = regoff_t rm_eo; // end of match
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| 52 | = } regmatch_t;
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| 53 | */
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| 54 | /*
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| 55 | * internals of regex_t
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| 56 | */
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| 57 | #define MAGIC1 ((('r'^0200)<<8) | 'e')
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| 58 |
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| 59 | /*
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| 60 | * The internal representation is a *strip*, a sequence of
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| 61 | * operators ending with an endmarker. (Some terminology etc. is a
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| 62 | * historical relic of earlier versions which used multiple strips.)
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| 63 | * Certain oddities in the representation are there to permit running
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| 64 | * the machinery backwards; in particular, any deviation from sequential
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| 65 | * flow must be marked at both its source and its destination. Some
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| 66 | * fine points:
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| 67 | *
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| 68 | * - OPLUS_ and O_PLUS are *inside* the loop they create.
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| 69 | * - OQUEST_ and O_QUEST are *outside* the bypass they create.
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| 70 | * - OCH_ and O_CH are *outside* the multi-way branch they create, while
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| 71 | * OOR1 and OOR2 are respectively the end and the beginning of one of
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| 72 | * the branches. Note that there is an implicit OOR2 following OCH_
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| 73 | * and an implicit OOR1 preceding O_CH.
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| 74 | *
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| 75 | * In state representations, an operator's bit is on to signify a state
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| 76 | * immediately *preceding* "execution" of that operator.
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| 77 | */
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| 78 | typedef unsigned long sop; /* strip operator */
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| 79 | typedef long sopno;
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| 80 | #define OPRMASK 0xf8000000
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| 81 | #define OPDMASK 0x07ffffff
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| 82 | #define OPSHIFT ((unsigned)27)
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| 83 | #define OP(n) ((n)&OPRMASK)
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| 84 | #define OPND(n) ((n)&OPDMASK)
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| 85 | #define SOP(op, opnd) ((op)|(opnd))
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| 86 | /* operators meaning operand */
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| 87 | /* (back, fwd are offsets) */
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| 88 | #define OEND (1<<OPSHIFT) /* endmarker - */
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| 89 | #define OCHAR (2<<OPSHIFT) /* character unsigned char */
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| 90 | #define OBOL (3<<OPSHIFT) /* left anchor - */
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| 91 | #define OEOL (4<<OPSHIFT) /* right anchor - */
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| 92 | #define OANY (5<<OPSHIFT) /* . - */
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| 93 | #define OANYOF (6<<OPSHIFT) /* [...] set number */
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| 94 | #define OBACK_ (7<<OPSHIFT) /* begin \d paren number */
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| 95 | #define O_BACK (8<<OPSHIFT) /* end \d paren number */
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| 96 | #define OPLUS_ (9<<OPSHIFT) /* + prefix fwd to suffix */
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| 97 | #define O_PLUS (10<<OPSHIFT) /* + suffix back to prefix */
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| 98 | #define OQUEST_ (11<<OPSHIFT) /* ? prefix fwd to suffix */
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| 99 | #define O_QUEST (12<<OPSHIFT) /* ? suffix back to prefix */
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| 100 | #define OLPAREN (13<<OPSHIFT) /* ( fwd to ) */
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| 101 | #define ORPAREN (14<<OPSHIFT) /* ) back to ( */
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| 102 | #define OCH_ (15<<OPSHIFT) /* begin choice fwd to OOR2 */
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| 103 | #define OOR1 (16<<OPSHIFT) /* | pt. 1 back to OOR1 or OCH_ */
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| 104 | #define OOR2 (17<<OPSHIFT) /* | pt. 2 fwd to OOR2 or O_CH */
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| 105 | #define O_CH (18<<OPSHIFT) /* end choice back to OOR1 */
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| 106 | #define OBOW (19<<OPSHIFT) /* begin word - */
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| 107 | #define OEOW (20<<OPSHIFT) /* end word - */
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| 108 |
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| 109 | /*
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| 110 | * Structure for [] character-set representation. Character sets are
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| 111 | * done as bit vectors, grouped 8 to a byte vector for compactness.
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| 112 | * The individual set therefore has both a pointer to the byte vector
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| 113 | * and a mask to pick out the relevant bit of each byte. A hash code
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| 114 | * simplifies testing whether two sets could be identical.
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| 115 | *
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| 116 | * This will get trickier for multicharacter collating elements. As
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| 117 | * preliminary hooks for dealing with such things, we also carry along
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| 118 | * a string of multi-character elements, and decide the size of the
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| 119 | * vectors at run time.
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| 120 | */
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| 121 | typedef struct {
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| 122 | uch *ptr; /* -> uch [csetsize] */
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| 123 | uch mask; /* bit within array */
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| 124 | uch hash; /* hash code */
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| 125 | size_t smultis;
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| 126 | char *multis; /* -> char[smulti] ab\0cd\0ef\0\0 */
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| 127 | } cset;
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| 128 | /* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */
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| 129 | #define CHadd(cs, c) ((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (c))
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| 130 | #define CHsub(cs, c) ((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (c))
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| 131 | #define CHIN(cs, c) ((cs)->ptr[(uch)(c)] & (cs)->mask)
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| 132 | #define MCadd(p, cs, cp) mcadd(p, cs, cp) /* regcomp() internal fns */
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| 133 | #define MCsub(p, cs, cp) mcsub(p, cs, cp)
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| 134 | #define MCin(p, cs, cp) mcin(p, cs, cp)
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| 135 |
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| 136 | /* stuff for character categories */
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| 137 | typedef unsigned char cat_t;
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| 138 |
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| 139 | /*
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| 140 | * main compiled-expression structure
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| 141 | */
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| 142 | struct re_guts {
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| 143 | int magic;
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| 144 | # define MAGIC2 ((('R'^0200)<<8)|'E')
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| 145 | sop *strip; /* malloced area for strip */
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| 146 | int csetsize; /* number of bits in a cset vector */
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| 147 | int ncsets; /* number of csets in use */
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| 148 | cset *sets; /* -> cset [ncsets] */
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| 149 | uch *setbits; /* -> uch[csetsize][ncsets/CHAR_BIT] */
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| 150 | int cflags; /* copy of regcomp() cflags argument */
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| 151 | sopno nstates; /* = number of sops */
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| 152 | sopno firststate; /* the initial OEND (normally 0) */
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| 153 | sopno laststate; /* the final OEND */
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| 154 | int iflags; /* internal flags */
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| 155 | # define USEBOL 01 /* used ^ */
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| 156 | # define USEEOL 02 /* used $ */
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| 157 | # define BAD 04 /* something wrong */
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| 158 | int nbol; /* number of ^ used */
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| 159 | int neol; /* number of $ used */
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| 160 | int ncategories; /* how many character categories */
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| 161 | cat_t *categories; /* ->catspace[-CHAR_MIN] */
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| 162 | char *must; /* match must contain this string */
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| 163 | int mlen; /* length of must */
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| 164 | size_t nsub; /* copy of re_nsub */
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| 165 | int backrefs; /* does it use back references? */
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| 166 | sopno nplus; /* how deep does it nest +s? */
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| 167 | /* catspace must be last */
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| 168 | cat_t catspace[1]; /* actually [NC] */
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| 169 | };
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| 170 |
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| 171 | /* misc utilities */
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| 172 | #define OUT (CHAR_MAX+1) /* a non-character value */
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| 173 | #define ISWORD(c) (isalnum(c) || (c) == '_')
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