1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)regex2.h 8.4 (Berkeley) 3/20/94 36 * $FreeBSD$ 37 */ 38 39 /* 40 * First, the stuff that ends up in the outside-world include file 41 = typedef off_t regoff_t; 42 = typedef struct { 43 = int re_magic; 44 = size_t re_nsub; // number of parenthesized subexpressions 45 = const char *re_endp; // end pointer for REG_PEND 46 = struct re_guts *re_g; // none of your business :-) 47 = } regex_t; 48 = typedef struct { 49 = regoff_t rm_so; // start of match 50 = regoff_t rm_eo; // end of match 51 = } regmatch_t; 52 */ 53 /* 54 * internals of regex_t 55 */ 56 #define MAGIC1 ((('r'^0200)<<8) | 'e') 57 58 /* 59 * The internal representation is a *strip*, a sequence of 60 * operators ending with an endmarker. (Some terminology etc. is a 61 * historical relic of earlier versions which used multiple strips.) 62 * Certain oddities in the representation are there to permit running 63 * the machinery backwards; in particular, any deviation from sequential 64 * flow must be marked at both its source and its destination. Some 65 * fine points: 66 * 67 * - OPLUS_ and O_PLUS are *inside* the loop they create. 68 * - OQUEST_ and O_QUEST are *outside* the bypass they create. 69 * - OCH_ and O_CH are *outside* the multi-way branch they create, while 70 * OOR1 and OOR2 are respectively the end and the beginning of one of 71 * the branches. Note that there is an implicit OOR2 following OCH_ 72 * and an implicit OOR1 preceding O_CH. 73 * 74 * In state representations, an operator's bit is on to signify a state 75 * immediately *preceding* "execution" of that operator. 76 */ 77 typedef unsigned long sop; /* strip operator */ 78 typedef unsigned long sopno; 79 #define OPRMASK 0xf8000000L 80 #define OPDMASK 0x07ffffffL 81 #define OPSHIFT ((unsigned)27) 82 #define OP(n) ((n)&OPRMASK) 83 #define OPND(n) ((n)&OPDMASK) 84 #define SOP(op, opnd) ((op)|(opnd)) 85 /* operators meaning operand */ 86 /* (back, fwd are offsets) */ 87 #define OEND (1L<<OPSHIFT) /* endmarker - */ 88 #define OCHAR (2L<<OPSHIFT) /* character wide character */ 89 #define OBOL (3L<<OPSHIFT) /* left anchor - */ 90 #define OEOL (4L<<OPSHIFT) /* right anchor - */ 91 #define OANY (5L<<OPSHIFT) /* . - */ 92 #define OANYOF (6L<<OPSHIFT) /* [...] set number */ 93 #define OBACK_ (7L<<OPSHIFT) /* begin \d paren number */ 94 #define O_BACK (8L<<OPSHIFT) /* end \d paren number */ 95 #define OPLUS_ (9L<<OPSHIFT) /* + prefix fwd to suffix */ 96 #define O_PLUS (10L<<OPSHIFT) /* + suffix back to prefix */ 97 #define OQUEST_ (11L<<OPSHIFT) /* ? prefix fwd to suffix */ 98 #define O_QUEST (12L<<OPSHIFT) /* ? suffix back to prefix */ 99 #define OLPAREN (13L<<OPSHIFT) /* ( fwd to ) */ 100 #define ORPAREN (14L<<OPSHIFT) /* ) back to ( */ 101 #define OCH_ (15L<<OPSHIFT) /* begin choice fwd to OOR2 */ 102 #define OOR1 (16L<<OPSHIFT) /* | pt. 1 back to OOR1 or OCH_ */ 103 #define OOR2 (17L<<OPSHIFT) /* | pt. 2 fwd to OOR2 or O_CH */ 104 #define O_CH (18L<<OPSHIFT) /* end choice back to OOR1 */ 105 #define OBOW (19L<<OPSHIFT) /* begin word - */ 106 #define OEOW (20L<<OPSHIFT) /* end word - */ 107 #define OBOS (21L<<OPSHIFT) /* begin subj. - */ 108 #define OEOS (22L<<OPSHIFT) /* end subj. - */ 109 #define OWBND (23L<<OPSHIFT) /* word bound - */ 110 #define ONWBND (24L<<OPSHIFT) /* not bound - */ 111 112 /* 113 * Structures for [] character-set representation. 114 */ 115 typedef struct { 116 wint_t min; 117 wint_t max; 118 } crange; 119 typedef struct { 120 unsigned char bmp[NC_MAX / 8]; 121 wctype_t *types; 122 unsigned int ntypes; 123 wint_t *wides; 124 unsigned int nwides; 125 crange *ranges; 126 unsigned int nranges; 127 int invert; 128 int icase; 129 } cset; 130 131 static int 132 CHIN1(cset *cs, wint_t ch) 133 { 134 unsigned int i; 135 136 assert(ch >= 0); 137 if (ch < NC) 138 return (((cs->bmp[ch >> 3] & (1 << (ch & 7))) != 0) ^ 139 cs->invert); 140 for (i = 0; i < cs->nwides; i++) { 141 if (cs->icase) { 142 if (ch == towlower(cs->wides[i]) || 143 ch == towupper(cs->wides[i])) 144 return (!cs->invert); 145 } else if (ch == cs->wides[i]) 146 return (!cs->invert); 147 } 148 for (i = 0; i < cs->nranges; i++) 149 if (cs->ranges[i].min <= ch && ch <= cs->ranges[i].max) 150 return (!cs->invert); 151 for (i = 0; i < cs->ntypes; i++) 152 if (iswctype(ch, cs->types[i])) 153 return (!cs->invert); 154 return (cs->invert); 155 } 156 157 static __inline int 158 CHIN(cset *cs, wint_t ch) 159 { 160 161 assert(ch >= 0); 162 if (ch < NC) 163 return (((cs->bmp[ch >> 3] & (1 << (ch & 7))) != 0) ^ 164 cs->invert); 165 else if (cs->icase) 166 return (CHIN1(cs, ch) || CHIN1(cs, towlower(ch)) || 167 CHIN1(cs, towupper(ch))); 168 else 169 return (CHIN1(cs, ch)); 170 } 171 172 /* 173 * main compiled-expression structure 174 */ 175 struct re_guts { 176 int magic; 177 # define MAGIC2 ((('R'^0200)<<8)|'E') 178 sop *strip; /* malloced area for strip */ 179 unsigned int ncsets; /* number of csets in use */ 180 cset *sets; /* -> cset [ncsets] */ 181 int cflags; /* copy of regcomp() cflags argument */ 182 sopno nstates; /* = number of sops */ 183 sopno firststate; /* the initial OEND (normally 0) */ 184 sopno laststate; /* the final OEND */ 185 int iflags; /* internal flags */ 186 # define USEBOL 01 /* used ^ */ 187 # define USEEOL 02 /* used $ */ 188 # define BAD 04 /* something wrong */ 189 int nbol; /* number of ^ used */ 190 int neol; /* number of $ used */ 191 char *must; /* match must contain this string */ 192 int moffset; /* latest point at which must may be located */ 193 int *charjump; /* Boyer-Moore char jump table */ 194 int *matchjump; /* Boyer-Moore match jump table */ 195 int mlen; /* length of must */ 196 size_t nsub; /* copy of re_nsub */ 197 int backrefs; /* does it use back references? */ 198 sopno nplus; /* how deep does it nest +s? */ 199 }; 200 201 /* misc utilities */ 202 #define OUT (CHAR_MIN - 1) /* a non-character value */ 203 #define IGN (CHAR_MIN - 2) 204 #define ISWORD(c) (iswalnum((uch)(c)) || (c) == '_') 205