Annotation of src/lib/libc/regex/regex2.h, Revision 1.9
1.9 ! drochner 1: /* $NetBSD: regex2.h,v 1.8 1998/12/08 13:41:42 drochner Exp $ */
1.5 cgd 2:
1.4 cgd 3: /*-
4: * Copyright (c) 1992, 1993, 1994 Henry Spencer.
5: * Copyright (c) 1992, 1993, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Henry Spencer.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the University of
22: * California, Berkeley and its contributors.
23: * 4. Neither the name of the University nor the names of its contributors
24: * may be used to endorse or promote products derived from this software
25: * without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37: * SUCH DAMAGE.
38: *
39: * @(#)regex2.h 8.4 (Berkeley) 3/20/94
40: */
41:
1.1 jtc 42: /*
43: * First, the stuff that ends up in the outside-world include file
44: = typedef off_t regoff_t;
45: = typedef struct {
46: = int re_magic;
47: = size_t re_nsub; // number of parenthesized subexpressions
1.3 jtc 48: = const char *re_endp; // end pointer for REG_PEND
1.1 jtc 49: = struct re_guts *re_g; // none of your business :-)
50: = } regex_t;
51: = typedef struct {
52: = regoff_t rm_so; // start of match
53: = regoff_t rm_eo; // end of match
54: = } regmatch_t;
55: */
56: /*
57: * internals of regex_t
58: */
59: #define MAGIC1 ((('r'^0200)<<8) | 'e')
60:
61: /*
62: * The internal representation is a *strip*, a sequence of
63: * operators ending with an endmarker. (Some terminology etc. is a
64: * historical relic of earlier versions which used multiple strips.)
65: * Certain oddities in the representation are there to permit running
66: * the machinery backwards; in particular, any deviation from sequential
67: * flow must be marked at both its source and its destination. Some
68: * fine points:
69: *
70: * - OPLUS_ and O_PLUS are *inside* the loop they create.
71: * - OQUEST_ and O_QUEST are *outside* the bypass they create.
72: * - OCH_ and O_CH are *outside* the multi-way branch they create, while
73: * OOR1 and OOR2 are respectively the end and the beginning of one of
74: * the branches. Note that there is an implicit OOR2 following OCH_
75: * and an implicit OOR1 preceding O_CH.
76: *
77: * In state representations, an operator's bit is on to signify a state
78: * immediately *preceding* "execution" of that operator.
79: */
1.7 christos 80: typedef u_int32_t sop; /* strip operator */
1.8 drochner 81: typedef int sopno;
1.7 christos 82: #define OPRMASK ((u_int32_t)0xf8000000UL)
83: #define OPDMASK ((u_int32_t)0x07ffffffUL)
1.8 drochner 84: #define OPSHIFT ((unsigned)27)
1.1 jtc 85: #define OP(n) ((n)&OPRMASK)
1.8 drochner 86: #define OPND(n) ((int)((n)&OPDMASK))
1.1 jtc 87: #define SOP(op, opnd) ((op)|(opnd))
1.8 drochner 88:
89: #define OPC(n) (((u_int32_t)(n))<<OPSHIFT)
1.7 christos 90: /* operators meaning operand */
91: /* (back, fwd are offsets) */
92: #define OEND OPC(1) /* endmarker - */
93: #define OCHAR OPC(2) /* character unsigned char */
94: #define OBOL OPC(3) /* left anchor - */
95: #define OEOL OPC(4) /* right anchor - */
96: #define OANY OPC(5) /* . - */
97: #define OANYOF OPC(6) /* [...] set number */
98: #define OBACK_ OPC(7) /* begin \d paren number */
99: #define O_BACK OPC(8) /* end \d paren number */
100: #define OPLUS_ OPC(9) /* + prefix fwd to suffix */
101: #define O_PLUS OPC(10) /* + suffix back to prefix */
102: #define OQUEST_ OPC(11) /* ? prefix fwd to suffix */
103: #define O_QUEST OPC(12) /* ? suffix back to prefix */
104: #define OLPAREN OPC(13) /* ( fwd to ) */
105: #define ORPAREN OPC(14) /* ) back to ( */
106: #define OCH_ OPC(15) /* begin choice fwd to OOR2 */
107: #define OOR1 OPC(16) /* | pt. 1 back to OOR1 or OCH_ */
108: #define OOR2 OPC(17) /* | pt. 2 fwd to OOR2 or O_CH */
109: #define O_CH OPC(18) /* end choice back to OOR1 */
110: #define OBOW OPC(19) /* begin word - */
111: #define OEOW OPC(20) /* end word - */
1.1 jtc 112:
113: /*
114: * Structure for [] character-set representation. Character sets are
115: * done as bit vectors, grouped 8 to a byte vector for compactness.
116: * The individual set therefore has both a pointer to the byte vector
117: * and a mask to pick out the relevant bit of each byte. A hash code
118: * simplifies testing whether two sets could be identical.
119: *
120: * This will get trickier for multicharacter collating elements. As
121: * preliminary hooks for dealing with such things, we also carry along
122: * a string of multi-character elements, and decide the size of the
123: * vectors at run time.
124: */
125: typedef struct {
1.2 jtc 126: uch *ptr; /* -> uch [csetsize] */
127: uch mask; /* bit within array */
128: uch hash; /* hash code */
1.1 jtc 129: size_t smultis;
130: char *multis; /* -> char[smulti] ab\0cd\0ef\0\0 */
131: } cset;
132: /* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */
1.2 jtc 133: #define CHadd(cs, c) ((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (c))
134: #define CHsub(cs, c) ((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (c))
135: #define CHIN(cs, c) ((cs)->ptr[(uch)(c)] & (cs)->mask)
136: #define MCadd(p, cs, cp) mcadd(p, cs, cp) /* regcomp() internal fns */
137: #define MCsub(p, cs, cp) mcsub(p, cs, cp)
138: #define MCin(p, cs, cp) mcin(p, cs, cp)
1.1 jtc 139:
140: /* stuff for character categories */
141: typedef unsigned char cat_t;
142:
143: /*
144: * main compiled-expression structure
145: */
146: struct re_guts {
147: int magic;
148: # define MAGIC2 ((('R'^0200)<<8)|'E')
149: sop *strip; /* malloced area for strip */
150: int csetsize; /* number of bits in a cset vector */
151: int ncsets; /* number of csets in use */
152: cset *sets; /* -> cset [ncsets] */
1.2 jtc 153: uch *setbits; /* -> uch[csetsize][ncsets/CHAR_BIT] */
1.1 jtc 154: int cflags; /* copy of regcomp() cflags argument */
155: sopno nstates; /* = number of sops */
156: sopno firststate; /* the initial OEND (normally 0) */
157: sopno laststate; /* the final OEND */
158: int iflags; /* internal flags */
159: # define USEBOL 01 /* used ^ */
160: # define USEEOL 02 /* used $ */
161: # define BAD 04 /* something wrong */
162: int nbol; /* number of ^ used */
163: int neol; /* number of $ used */
164: int ncategories; /* how many character categories */
165: cat_t *categories; /* ->catspace[-CHAR_MIN] */
166: char *must; /* match must contain this string */
167: int mlen; /* length of must */
1.9 ! drochner 168: sopno nsub; /* copy of re_nsub */
1.1 jtc 169: int backrefs; /* does it use back references? */
170: sopno nplus; /* how deep does it nest +s? */
171: /* catspace must be last */
172: cat_t catspace[1]; /* actually [NC] */
173: };
174:
175: /* misc utilities */
176: #define OUT (CHAR_MAX+1) /* a non-character value */
1.3 jtc 177: #define ISWORD(c) (isalnum(c) || (c) == '_')
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