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Annotation of src/lib/libc/regex/regex2.h, Revision 1.1

1.1     ! jtc         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: #define        MAGIC1  ((('r'^0200)<<8) | 'e')
        !            19:
        !            20: /*
        !            21:  * The internal representation is a *strip*, a sequence of
        !            22:  * operators ending with an endmarker.  (Some terminology etc. is a
        !            23:  * historical relic of earlier versions which used multiple strips.)
        !            24:  * Certain oddities in the representation are there to permit running
        !            25:  * the machinery backwards; in particular, any deviation from sequential
        !            26:  * flow must be marked at both its source and its destination.  Some
        !            27:  * fine points:
        !            28:  *
        !            29:  * - OPLUS_ and O_PLUS are *inside* the loop they create.
        !            30:  * - OQUEST_ and O_QUEST are *outside* the bypass they create.
        !            31:  * - OCH_ and O_CH are *outside* the multi-way branch they create, while
        !            32:  *   OOR1 and OOR2 are respectively the end and the beginning of one of
        !            33:  *   the branches.  Note that there is an implicit OOR2 following OCH_
        !            34:  *   and an implicit OOR1 preceding O_CH.
        !            35:  *
        !            36:  * In state representations, an operator's bit is on to signify a state
        !            37:  * immediately *preceding* "execution" of that operator.
        !            38:  */
        !            39: typedef unsigned long sop;     /* strip operator */
        !            40: typedef long sopno;
        !            41: #define        OPRMASK 0xf8000000
        !            42: #define        OPDMASK 0x07ffffff
        !            43: #define        OPSHIFT ((unsigned)27)
        !            44: #define        OP(n)   ((n)&OPRMASK)
        !            45: #define        OPND(n) ((n)&OPDMASK)
        !            46: #define        SOP(op, opnd)   ((op)|(opnd))
        !            47: /* operators                      meaning      operand                 */
        !            48: /*                                             (back, fwd are offsets) */
        !            49: #define        OEND    (1<<OPSHIFT)    /* endmarker    -                       */
        !            50: #define        OCHAR   (2<<OPSHIFT)    /* character    unsigned char           */
        !            51: #define        OBOL    (3<<OPSHIFT)    /* left anchor  -                       */
        !            52: #define        OEOL    (4<<OPSHIFT)    /* right anchor -                       */
        !            53: #define        OANY    (5<<OPSHIFT)    /* .            -                       */
        !            54: #define        OANYOF  (6<<OPSHIFT)    /* [...]        set number              */
        !            55: #define        OBACK_  (7<<OPSHIFT)    /* begin \d     paren number            */
        !            56: #define        O_BACK  (8<<OPSHIFT)    /* end \d       paren number            */
        !            57: #define        OPLUS_  (9<<OPSHIFT)    /* + prefix     fwd to suffix           */
        !            58: #define        O_PLUS  (10<<OPSHIFT)   /* + suffix     back to prefix          */
        !            59: #define        OQUEST_ (11<<OPSHIFT)   /* ? prefix     fwd to suffix           */
        !            60: #define        O_QUEST (12<<OPSHIFT)   /* ? suffix     back to prefix          */
        !            61: #define        OLPAREN (13<<OPSHIFT)   /* (            fwd to )                */
        !            62: #define        ORPAREN (14<<OPSHIFT)   /* )            back to (               */
        !            63: #define        OCH_    (15<<OPSHIFT)   /* begin choice fwd to OOR2             */
        !            64: #define        OOR1    (16<<OPSHIFT)   /* | pt. 1      back to OOR1 or OCH_    */
        !            65: #define        OOR2    (17<<OPSHIFT)   /* | pt. 2      fwd to OOR2 or O_CH     */
        !            66: #define        O_CH    (18<<OPSHIFT)   /* end choice   back to OOR1            */
        !            67: #define        OBOW    (19<<OPSHIFT)   /* begin word   -                       */
        !            68: #define        OEOW    (20<<OPSHIFT)   /* end word     -                       */
        !            69:
        !            70: /*
        !            71:  * Structure for [] character-set representation.  Character sets are
        !            72:  * done as bit vectors, grouped 8 to a byte vector for compactness.
        !            73:  * The individual set therefore has both a pointer to the byte vector
        !            74:  * and a mask to pick out the relevant bit of each byte.  A hash code
        !            75:  * simplifies testing whether two sets could be identical.
        !            76:  *
        !            77:  * This will get trickier for multicharacter collating elements.  As
        !            78:  * preliminary hooks for dealing with such things, we also carry along
        !            79:  * a string of multi-character elements, and decide the size of the
        !            80:  * vectors at run time.
        !            81:  */
        !            82: typedef struct {
        !            83:        uchar *ptr;             /* -> uchar [csetsize] */
        !            84:        uchar mask;             /* bit within array */
        !            85:        uchar hash;             /* hash code */
        !            86:        size_t smultis;
        !            87:        char *multis;           /* -> char[smulti]  ab\0cd\0ef\0\0 */
        !            88: } cset;
        !            89: /* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */
        !            90: #define        CHadd(cs, c)    ((cs)->ptr[(uchar)(c)] |= (cs)->mask, (cs)->hash += (c))
        !            91: #define        CHsub(cs, c)    ((cs)->ptr[(uchar)(c)] &= ~(cs)->mask, (cs)->hash -= (c))
        !            92: #define        CHIN(cs, c)     ((cs)->ptr[(uchar)(c)] & (cs)->mask)
        !            93: #define        MCadd(cs, cp)   mcadd(p, cs, cp)        /* regcomp() internal fns */
        !            94: #define        MCsub(cs, cp)   mcsub(cs, cp)
        !            95: #define        MCin(cs, cp)    mcin(cs, cp)
        !            96:
        !            97: /* stuff for character categories */
        !            98: typedef unsigned char cat_t;
        !            99:
        !           100: /*
        !           101:  * main compiled-expression structure
        !           102:  */
        !           103: struct re_guts {
        !           104:        int magic;
        !           105: #              define  MAGIC2  ((('R'^0200)<<8)|'E')
        !           106:        sop *strip;             /* malloced area for strip */
        !           107:        int csetsize;           /* number of bits in a cset vector */
        !           108:        int ncsets;             /* number of csets in use */
        !           109:        cset *sets;             /* -> cset [ncsets] */
        !           110:        uchar *setbits;         /* -> uchar[csetsize][ncsets/CHAR_BIT] */
        !           111:        int cflags;             /* copy of regcomp() cflags argument */
        !           112:        sopno nstates;          /* = number of sops */
        !           113:        sopno firststate;       /* the initial OEND (normally 0) */
        !           114:        sopno laststate;        /* the final OEND */
        !           115:        int iflags;             /* internal flags */
        !           116: #              define  USEBOL  01      /* used ^ */
        !           117: #              define  USEEOL  02      /* used $ */
        !           118: #              define  BAD     04      /* something wrong */
        !           119:        int nbol;               /* number of ^ used */
        !           120:        int neol;               /* number of $ used */
        !           121:        int ncategories;        /* how many character categories */
        !           122:        cat_t *categories;      /* ->catspace[-CHAR_MIN] */
        !           123:        char *must;             /* match must contain this string */
        !           124:        int mlen;               /* length of must */
        !           125:        size_t nsub;            /* copy of re_nsub */
        !           126:        int backrefs;           /* does it use back references? */
        !           127:        sopno nplus;            /* how deep does it nest +s? */
        !           128:        /* catspace must be last */
        !           129:        cat_t catspace[1];      /* actually [NC] */
        !           130: };
        !           131:
        !           132: /* misc utilities */
        !           133: #define        OUT     (CHAR_MAX+1)    /* a non-character value */