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Annotation of 3BSD/cmd/ex/ex_re.h, revision 1.1

1.1     ! root        1: /* Copyright (c) 1979 Regents of the University of California */
        !             2: /*
        !             3:  * Regular expression definitions.
        !             4:  * The regular expressions in ex are similar to those in ed,
        !             5:  * with the addition of the word boundaries from Toronto ed
        !             6:  * and allowing character classes to have [a-b] as in the shell.
        !             7:  * The numbers for the nodes below are spaced further apart then
        !             8:  * necessary because I at one time partially put in + and | (one or
        !             9:  * more and alternation.)
        !            10:  */
        !            11: struct regexp {
        !            12:        char    Expbuf[ESIZE + 2];
        !            13:        bool    Circfl;
        !            14:        short   Nbra;
        !            15: };
        !            16: 
        !            17: /*
        !            18:  * There are three regular expressions here, the previous (in re),
        !            19:  * the previous substitute (in subre) and the previous scanning (in scanre).
        !            20:  * It would be possible to get rid of "re" by making it a stack parameter
        !            21:  * to the appropriate routines.
        !            22:  */
        !            23: struct regexp re;              /* Last re */
        !            24: struct regexp scanre;          /* Last scanning re */
        !            25: struct regexp subre;           /* Last substitute re */
        !            26: 
        !            27: /*
        !            28:  * Defining circfl and expbuf like this saves us from having to change
        !            29:  * old code in the ex_re.c stuff.
        !            30:  */
        !            31: #define        expbuf  re.Expbuf
        !            32: #define        circfl  re.Circfl
        !            33: #define        nbra    re.Nbra
        !            34: 
        !            35: /*
        !            36:  * Since the phototypesetter v7-epsilon
        !            37:  * C compiler doesn't have structure assignment...
        !            38:  */
        !            39: #define        savere(a)       copy(&a, &re, sizeof (struct regexp))
        !            40: #define        resre(a)        copy(&re, &a, sizeof (struct regexp))
        !            41: 
        !            42: /*
        !            43:  * Definitions for substitute
        !            44:  */
        !            45: char   *braslist[NBRA];        /* Starts of \(\)'ed text in lhs */
        !            46: char   *braelist[NBRA];        /* Ends... */
        !            47: char   rhsbuf[RHSSIZE];        /* Rhs of last substitute */
        !            48: 
        !            49: /*
        !            50:  * Definitions of codes for the compiled re's.
        !            51:  * The re algorithm is described in a paper
        !            52:  * by K. Thompson in the CACM about 10 years ago
        !            53:  * and is the same as in ed.
        !            54:  */
        !            55: #define        STAR    1
        !            56: 
        !            57: #define        CBRA    1
        !            58: #define        CDOT    4
        !            59: #define        CCL     8
        !            60: #define        NCCL    12
        !            61: #define        CDOL    16
        !            62: #define        CEOF    17
        !            63: #define        CKET    18
        !            64: #define        CCHR    20
        !            65: #define        CBRC    24
        !            66: #define        CLET    25

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