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 | * $FreeBSD: src/lib/libc/regex/regex2.h,v 1.6 2002/03/22 23:41:56 obrien Exp $ |
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39 | */ |
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40 | |
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41 | /* |
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42 | * First, the stuff that ends up in the outside-world include file |
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43 | = typedef off_t regoff_t; |
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44 | = typedef struct { |
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45 | = int re_magic; |
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46 | = size_t re_nsub; // number of parenthesized subexpressions |
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47 | = const char *re_endp; // end pointer for REG_PEND |
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48 | = struct re_guts *re_g; // none of your business :-) |
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49 | = } regex_t; |
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50 | = typedef struct { |
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51 | = regoff_t rm_so; // start of match |
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52 | = regoff_t rm_eo; // end of match |
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53 | = } regmatch_t; |
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54 | */ |
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55 | /* |
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56 | * internals of regex_t |
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57 | */ |
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58 | #define MAGIC1 ((('r'^0200)<<8) | 'e') |
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59 | |
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60 | /* |
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61 | * The internal representation is a *strip*, a sequence of |
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62 | * operators ending with an endmarker. (Some terminology etc. is a |
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63 | * historical relic of earlier versions which used multiple strips.) |
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64 | * Certain oddities in the representation are there to permit running |
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65 | * the machinery backwards; in particular, any deviation from sequential |
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66 | * flow must be marked at both its source and its destination. Some |
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67 | * fine points: |
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68 | * |
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69 | * - OPLUS_ and O_PLUS are *inside* the loop they create. |
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70 | * - OQUEST_ and O_QUEST are *outside* the bypass they create. |
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71 | * - OCH_ and O_CH are *outside* the multi-way branch they create, while |
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72 | * OOR1 and OOR2 are respectively the end and the beginning of one of |
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73 | * the branches. Note that there is an implicit OOR2 following OCH_ |
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74 | * and an implicit OOR1 preceding O_CH. |
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75 | * |
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76 | * In state representations, an operator's bit is on to signify a state |
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77 | * immediately *preceding* "execution" of that operator. |
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78 | */ |
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79 | typedef unsigned long sop; /* strip operator */ |
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80 | typedef long sopno; |
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81 | #define OPRMASK 0xf8000000L |
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82 | #define OPDMASK 0x07ffffffL |
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83 | #define OPSHIFT ((unsigned)27) |
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84 | #define OP(n) ((n)&OPRMASK) |
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85 | #define OPND(n) ((n)&OPDMASK) |
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86 | #define SOP(op, opnd) ((op)|(opnd)) |
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87 | /* operators meaning operand */ |
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88 | /* (back, fwd are offsets) */ |
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89 | #define OEND (1L<<OPSHIFT) /* endmarker - */ |
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90 | #define OCHAR (2L<<OPSHIFT) /* character unsigned char */ |
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91 | #define OBOL (3L<<OPSHIFT) /* left anchor - */ |
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92 | #define OEOL (4L<<OPSHIFT) /* right anchor - */ |
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93 | #define OANY (5L<<OPSHIFT) /* . - */ |
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94 | #define OANYOF (6L<<OPSHIFT) /* [...] set number */ |
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95 | #define OBACK_ (7L<<OPSHIFT) /* begin \d paren number */ |
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96 | #define O_BACK (8L<<OPSHIFT) /* end \d paren number */ |
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97 | #define OPLUS_ (9L<<OPSHIFT) /* + prefix fwd to suffix */ |
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98 | #define O_PLUS (10L<<OPSHIFT) /* + suffix back to prefix */ |
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99 | #define OQUEST_ (11L<<OPSHIFT) /* ? prefix fwd to suffix */ |
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100 | #define O_QUEST (12L<<OPSHIFT) /* ? suffix back to prefix */ |
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101 | #define OLPAREN (13L<<OPSHIFT) /* ( fwd to ) */ |
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102 | #define ORPAREN (14L<<OPSHIFT) /* ) back to ( */ |
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103 | #define OCH_ (15L<<OPSHIFT) /* begin choice fwd to OOR2 */ |
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104 | #define OOR1 (16L<<OPSHIFT) /* | pt. 1 back to OOR1 or OCH_ */ |
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105 | #define OOR2 (17L<<OPSHIFT) /* | pt. 2 fwd to OOR2 or O_CH */ |
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106 | #define O_CH (18L<<OPSHIFT) /* end choice back to OOR1 */ |
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107 | #define OBOW (19L<<OPSHIFT) /* begin word - */ |
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108 | #define OEOW (20L<<OPSHIFT) /* end word - */ |
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109 | |
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110 | /* |
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111 | * Structure for [] character-set representation. Character sets are |
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112 | * done as bit vectors, grouped 8 to a byte vector for compactness. |
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113 | * The individual set therefore has both a pointer to the byte vector |
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114 | * and a mask to pick out the relevant bit of each byte. A hash code |
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115 | * simplifies testing whether two sets could be identical. |
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116 | * |
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117 | * This will get trickier for multicharacter collating elements. As |
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118 | * preliminary hooks for dealing with such things, we also carry along |
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119 | * a string of multi-character elements, and decide the size of the |
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120 | * vectors at run time. |
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121 | */ |
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122 | typedef struct { |
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123 | uch *ptr; /* -> uch [csetsize] */ |
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124 | uch mask; /* bit within array */ |
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125 | short hash; /* hash code */ |
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126 | size_t smultis; |
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127 | char *multis; /* -> char[smulti] ab\0cd\0ef\0\0 */ |
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128 | } cset; |
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129 | /* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */ |
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130 | #define CHadd(cs, c) ((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (uch)(c)) |
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131 | #define CHsub(cs, c) ((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (uch)(c)) |
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132 | #define CHIN(cs, c) ((cs)->ptr[(uch)(c)] & (cs)->mask) |
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133 | #define MCadd(p, cs, cp) mcadd(p, cs, cp) /* regcomp() internal fns */ |
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134 | #define MCsub(p, cs, cp) mcsub(p, cs, cp) |
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135 | #define MCin(p, cs, cp) mcin(p, cs, cp) |
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136 | |
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137 | /* stuff for character categories */ |
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138 | typedef unsigned char cat_t; |
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139 | |
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140 | /* |
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141 | * main compiled-expression structure |
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142 | */ |
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143 | struct re_guts { |
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144 | int magic; |
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145 | # define MAGIC2 ((('R'^0200)<<8)|'E') |
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146 | sop *strip; /* malloced area for strip */ |
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147 | int csetsize; /* number of bits in a cset vector */ |
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148 | int ncsets; /* number of csets in use */ |
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149 | cset *sets; /* -> cset [ncsets] */ |
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150 | uch *setbits; /* -> uch[csetsize][ncsets/CHAR_BIT] */ |
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151 | int cflags; /* copy of regcomp() cflags argument */ |
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152 | sopno nstates; /* = number of sops */ |
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153 | sopno firststate; /* the initial OEND (normally 0) */ |
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154 | sopno laststate; /* the final OEND */ |
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155 | int iflags; /* internal flags */ |
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156 | # define USEBOL 01 /* used ^ */ |
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157 | # define USEEOL 02 /* used $ */ |
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158 | # define BAD 04 /* something wrong */ |
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159 | int nbol; /* number of ^ used */ |
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160 | int neol; /* number of $ used */ |
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161 | int ncategories; /* how many character categories */ |
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162 | cat_t *categories; /* ->catspace[-CHAR_MIN] */ |
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163 | char *must; /* match must contain this string */ |
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164 | int moffset; /* latest point at which must may be located */ |
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165 | int *charjump; /* Boyer-Moore char jump table */ |
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166 | int *matchjump; /* Boyer-Moore match jump table */ |
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167 | int mlen; /* length of must */ |
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168 | size_t nsub; /* copy of re_nsub */ |
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169 | int backrefs; /* does it use back references? */ |
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170 | sopno nplus; /* how deep does it nest +s? */ |
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171 | /* catspace must be last */ |
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172 | cat_t catspace[1]; /* actually [NC] */ |
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173 | }; |
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174 | |
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175 | /* misc utilities */ |
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176 | #define OUT (CHAR_MAX+1) /* a non-character value */ |
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177 | #define ISWORD(c) (isalnum((uch)(c)) || (c) == '_') |
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