source: trunk/minix/lib/regex/regex2.h@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a

File size: 7.2 KB
Line 
1/*-
2 * Copyright (c) 1992, 1993, 1994 Henry Spencer.
3 * Copyright (c) 1992, 1993, 1994
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Henry Spencer.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)regex2.h 8.4 (Berkeley) 3/20/94
38 */
39
40/*
41 * First, the stuff that ends up in the outside-world include file
42 = typedef off_t regoff_t;
43 = typedef struct {
44 = int re_magic;
45 = size_t re_nsub; // number of parenthesized subexpressions
46 = const char *re_endp; // end pointer for REG_PEND
47 = struct re_guts *re_g; // none of your business :-)
48 = } regex_t;
49 = typedef struct {
50 = regoff_t rm_so; // start of match
51 = regoff_t rm_eo; // end of match
52 = } regmatch_t;
53 */
54/*
55 * internals of regex_t
56 */
57#define MAGIC1 ((('r'^0200)<<8) | 'e')
58
59/*
60 * The internal representation is a *strip*, a sequence of
61 * operators ending with an endmarker. (Some terminology etc. is a
62 * historical relic of earlier versions which used multiple strips.)
63 * Certain oddities in the representation are there to permit running
64 * the machinery backwards; in particular, any deviation from sequential
65 * flow must be marked at both its source and its destination. Some
66 * fine points:
67 *
68 * - OPLUS_ and O_PLUS are *inside* the loop they create.
69 * - OQUEST_ and O_QUEST are *outside* the bypass they create.
70 * - OCH_ and O_CH are *outside* the multi-way branch they create, while
71 * OOR1 and OOR2 are respectively the end and the beginning of one of
72 * the branches. Note that there is an implicit OOR2 following OCH_
73 * and an implicit OOR1 preceding O_CH.
74 *
75 * In state representations, an operator's bit is on to signify a state
76 * immediately *preceding* "execution" of that operator.
77 */
78typedef unsigned long sop; /* strip operator */
79typedef long sopno;
80#define OPRMASK 0xf8000000
81#define OPDMASK 0x07ffffff
82#define OPSHIFT ((unsigned)27)
83#define OP(n) ((n)&OPRMASK)
84#define OPND(n) ((n)&OPDMASK)
85#define SOP(op, opnd) ((op)|(opnd))
86/* operators meaning operand */
87/* (back, fwd are offsets) */
88#define OEND (1<<OPSHIFT) /* endmarker - */
89#define OCHAR (2<<OPSHIFT) /* character unsigned char */
90#define OBOL (3<<OPSHIFT) /* left anchor - */
91#define OEOL (4<<OPSHIFT) /* right anchor - */
92#define OANY (5<<OPSHIFT) /* . - */
93#define OANYOF (6<<OPSHIFT) /* [...] set number */
94#define OBACK_ (7<<OPSHIFT) /* begin \d paren number */
95#define O_BACK (8<<OPSHIFT) /* end \d paren number */
96#define OPLUS_ (9<<OPSHIFT) /* + prefix fwd to suffix */
97#define O_PLUS (10<<OPSHIFT) /* + suffix back to prefix */
98#define OQUEST_ (11<<OPSHIFT) /* ? prefix fwd to suffix */
99#define O_QUEST (12<<OPSHIFT) /* ? suffix back to prefix */
100#define OLPAREN (13<<OPSHIFT) /* ( fwd to ) */
101#define ORPAREN (14<<OPSHIFT) /* ) back to ( */
102#define OCH_ (15<<OPSHIFT) /* begin choice fwd to OOR2 */
103#define OOR1 (16<<OPSHIFT) /* | pt. 1 back to OOR1 or OCH_ */
104#define OOR2 (17<<OPSHIFT) /* | pt. 2 fwd to OOR2 or O_CH */
105#define O_CH (18<<OPSHIFT) /* end choice back to OOR1 */
106#define OBOW (19<<OPSHIFT) /* begin word - */
107#define OEOW (20<<OPSHIFT) /* end word - */
108
109/*
110 * Structure for [] character-set representation. Character sets are
111 * done as bit vectors, grouped 8 to a byte vector for compactness.
112 * The individual set therefore has both a pointer to the byte vector
113 * and a mask to pick out the relevant bit of each byte. A hash code
114 * simplifies testing whether two sets could be identical.
115 *
116 * This will get trickier for multicharacter collating elements. As
117 * preliminary hooks for dealing with such things, we also carry along
118 * a string of multi-character elements, and decide the size of the
119 * vectors at run time.
120 */
121typedef struct {
122 uch *ptr; /* -> uch [csetsize] */
123 uch mask; /* bit within array */
124 uch hash; /* hash code */
125 size_t smultis;
126 char *multis; /* -> char[smulti] ab\0cd\0ef\0\0 */
127} cset;
128/* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */
129#define CHadd(cs, c) ((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (c))
130#define CHsub(cs, c) ((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (c))
131#define CHIN(cs, c) ((cs)->ptr[(uch)(c)] & (cs)->mask)
132#define MCadd(p, cs, cp) mcadd(p, cs, cp) /* regcomp() internal fns */
133#define MCsub(p, cs, cp) mcsub(p, cs, cp)
134#define MCin(p, cs, cp) mcin(p, cs, cp)
135
136/* stuff for character categories */
137typedef unsigned char cat_t;
138
139/*
140 * main compiled-expression structure
141 */
142struct re_guts {
143 int magic;
144# define MAGIC2 ((('R'^0200)<<8)|'E')
145 sop *strip; /* malloced area for strip */
146 int csetsize; /* number of bits in a cset vector */
147 int ncsets; /* number of csets in use */
148 cset *sets; /* -> cset [ncsets] */
149 uch *setbits; /* -> uch[csetsize][ncsets/CHAR_BIT] */
150 int cflags; /* copy of regcomp() cflags argument */
151 sopno nstates; /* = number of sops */
152 sopno firststate; /* the initial OEND (normally 0) */
153 sopno laststate; /* the final OEND */
154 int iflags; /* internal flags */
155# define USEBOL 01 /* used ^ */
156# define USEEOL 02 /* used $ */
157# define BAD 04 /* something wrong */
158 int nbol; /* number of ^ used */
159 int neol; /* number of $ used */
160 int ncategories; /* how many character categories */
161 cat_t *categories; /* ->catspace[-CHAR_MIN] */
162 char *must; /* match must contain this string */
163 int mlen; /* length of must */
164 size_t nsub; /* copy of re_nsub */
165 int backrefs; /* does it use back references? */
166 sopno nplus; /* how deep does it nest +s? */
167 /* catspace must be last */
168 cat_t catspace[1]; /* actually [NC] */
169};
170
171/* misc utilities */
172#define OUT (CHAR_MAX+1) /* a non-character value */
173#define ISWORD(c) (isalnum(c) || (c) == '_')
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