release/src/router/mysql/regex/regex2.h

   1 /*
   2  * First, the stuff that ends up in the outside-world include file
   3  = typedef off_t regoff_t;
   4  = typedef struct {
   5  =      int re_magic;
   6  =      size_t re_nsub;         // number of parenthesized subexpressions
   7  =      const char *re_endp;    // end pointer for REG_PEND
   8  =      struct re_guts *re_g;   // none of your business :-)
   9  = } regex_t;
  10  = typedef struct {
  11  =      regoff_t rm_so;         // start of match
  12  =      regoff_t rm_eo;         // end of match
  13  = } regmatch_t;
  14  */
  15 /*
  16  * internals of regex_t
  17  */
  18 #ifndef __regex2_h__
  19 #define __regex2_h__
  20
  21 #define MAGIC1  ((('r'^0200)<<8) | 'e')
  22
  23 /*
  24  * The internal representation is a *strip*, a sequence of
  25  * operators ending with an endmarker.  (Some terminology etc. is a
  26  * historical relic of earlier versions which used multiple strips.)
  27  * Certain oddities in the representation are there to permit running
  28  * the machinery backwards; in particular, any deviation from sequential
  29  * flow must be marked at both its source and its destination.  Some
  30  * fine points:
  31  *
  32  * - OPLUS_ and O_PLUS are *inside* the loop they create.
  33  * - OQUEST_ and O_QUEST are *outside* the bypass they create.
  34  * - OCH_ and O_CH are *outside* the multi-way branch they create, while
  35  *   OOR1 and OOR2 are respectively the end and the beginning of one of
  36  *   the branches.  Note that there is an implicit OOR2 following OCH_
  37  *   and an implicit OOR1 preceding O_CH.
  38  *
  39  * In state representations, an operator's bit is on to signify a state
  40  * immediately *preceding* "execution" of that operator.
  41  */
  42 typedef unsigned long sop;      /* strip operator */
  43 typedef long sopno;
  44 #define OPRMASK 0xf8000000
  45 #define OPDMASK 0x07ffffff
  46 #define OPSHIFT ((unsigned long)27)
  47 #define OP(n)   ((unsigned long) ((n)&OPRMASK))
  48 #define OPND(n) ((unsigned long) ((n)&OPDMASK))
  49 #define SOP(op, opnd)   (unsigned long) ((op)|(opnd))
  50 #define OSHIFT(A) ((unsigned long) (A) << OPSHIFT)
  51 /* operators                       meaning      operand                 */
  52 /*                                              (back, fwd are offsets) */
  53 #define OEND    OSHIFT(1)       /* endmarker    -                       */
  54 #define OCHAR   OSHIFT(2)       /* character    unsigned char           */
  55 #define OBOL    OSHIFT(3)       /* left anchor  -                       */
  56 #define OEOL    OSHIFT(4)       /* right anchor -                       */
  57 #define OANY    OSHIFT(5)       /* .            -                       */
  58 #define OANYOF  OSHIFT(6)       /* [...]        set number              */
  59 #define OBACK_  OSHIFT(7)       /* begin \d     paren number            */
  60 #define O_BACK  OSHIFT(8)       /* end \d       paren number            */
  61 #define OPLUS_  OSHIFT(9)       /* + prefix     fwd to suffix           */
  62 #define O_PLUS  OSHIFT(10)      /* + suffix     back to prefix          */
  63 #define OQUEST_ OSHIFT(11)      /* ? prefix     fwd to suffix           */
  64 #define O_QUEST OSHIFT(12)      /* ? suffix     back to prefix          */
  65 #define OLPAREN OSHIFT(13)      /* (            fwd to )                */
  66 #define ORPAREN OSHIFT(14)      /* )            back to (               */
  67 #define OCH_    OSHIFT(15)      /* begin choice fwd to OOR2             */
  68 #define OOR1    OSHIFT(16)      /* | pt. 1      back to OOR1 or OCH_    */
  69 #define OOR2    OSHIFT(17)      /* | pt. 2      fwd to OOR2 or O_CH     */
  70 #define O_CH    OSHIFT(18)      /* end choice   back to OOR1            */
  71 #define OBOW    OSHIFT(19)      /* begin word   -                       */
  72 #define OEOW    OSHIFT(20)      /* end word     -                       */
  73
  74 /*
  75  * Structure for [] character-set representation.  Character sets are
  76  * done as bit vectors, grouped 8 to a byte vector for compactness.
  77  * The individual set therefore has both a pointer to the byte vector
  78  * and a mask to pick out the relevant bit of each byte.  A hash code
  79  * simplifies testing whether two sets could be identical.
  80  *
  81  * This will get trickier for multicharacter collating elements.  As
  82  * preliminary hooks for dealing with such things, we also carry along
  83  * a string of multi-character elements, and decide the size of the
  84  * vectors at run time.
  85  */
  86 #ifdef __WIN__
  87 typedef unsigned char uch ;
  88 #endif
  89
  90 typedef struct {
  91         uch *ptr;               /* -> uch [csetsize] */
  92         uch mask;               /* bit within array */
  93         uch hash;               /* hash code */
  94         size_t smultis;
  95         char *multis;           /* -> char[smulti]  ab\0cd\0ef\0\0 */
  96 } cset;
  97 /* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */
  98 #define CHadd(cs, c)    ((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (uch) (c))
  99 #define CHsub(cs, c)    ((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (uch)(c))
 100 #define CHIN(cs, c)     ((cs)->ptr[(uch)(c)] & (cs)->mask)
 101 #define MCadd(p, cs, cp)        mcadd(p, cs, cp)        /* regcomp() internal fns */
 102 #define MCsub(p, cs, cp)        mcsub(p, cs, cp)
 103 #define MCin(p, cs, cp) mcin(p, cs, cp)
 104
 105 /* stuff for character categories */
 106 typedef unsigned char cat_t;
 107
 108 /*
 109  * main compiled-expression structure
 110  */
 111 struct re_guts {
 112         int magic;
 113 #               define  MAGIC2  ((('R'^0200)<<8)|'E')
 114         sop *strip;             /* malloced area for strip */
 115         int csetsize;           /* number of bits in a cset vector */
 116         int ncsets;             /* number of csets in use */
 117         cset *sets;             /* -> cset [ncsets] */
 118         uch *setbits;           /* -> uch[csetsize][ncsets/CHAR_BIT] */
 119         int cflags;             /* copy of regcomp() cflags argument */
 120         sopno nstates;          /* = number of sops */
 121         sopno firststate;       /* the initial OEND (normally 0) */
 122         sopno laststate;        /* the final OEND */
 123         int iflags;             /* internal flags */
 124 #               define  USEBOL  01      /* used ^ */
 125 #               define  USEEOL  02      /* used $ */
 126 #               define  BAD     04      /* something wrong */
 127         int nbol;               /* number of ^ used */
 128         int neol;               /* number of $ used */
 129         int ncategories;        /* how many character categories */
 130         cat_t *categories;      /* ->catspace[-CHAR_MIN] */
 131         char *must;             /* match must contain this string */
 132         int mlen;               /* length of must */
 133         size_t nsub;            /* copy of re_nsub */
 134         int backrefs;           /* does it use back references? */
 135         sopno nplus;            /* how deep does it nest +s? */
 136         /* catspace must be last */
 137         cat_t catspace[1];      /* actually [NC] */
 138 };
 139
 140 /* misc utilities */
 141 #undef OUT                      /* May be defined in windows */
 142 #define OUT     (CHAR_MAX+1)    /* a non-character value */
 143 #define ISWORD(s,c)     (my_isalnum(s,c) || (c) == '_')
 144
 145 #endif /* __regex2_h__ */