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Annotation of 43BSD/contrib/icon/operators/tabmat.c, revision 1.1

1.1     ! root        1: #include "../h/rt.h"
        !             2: 
        !             3: /*
        !             4:  * =x - tab(match(x)).
        !             5:  * Reverses effects if resumed.
        !             6:  */
        !             7: 
        !             8: tabmat(nargs, oldsubj, arg1, arg0)
        !             9: int nargs;
        !            10: struct descrip oldsubj, arg1, arg0;
        !            11:    {
        !            12:    DclSave
        !            13:    register int l;
        !            14:    register char *s1, *s2;
        !            15:    int i, j;
        !            16:    char sbuf[MAXSTRING];
        !            17: 
        !            18:    SetBound;
        !            19:    /*
        !            20:     * x must be a string.
        !            21:     */
        !            22:    if (cvstr(&arg1,sbuf) == NULL)
        !            23:       runerr(103, &arg1);
        !            24: 
        !            25:    /*
        !            26:     * Make a copy of &subject and &pos.
        !            27:     */
        !            28:    oldsubj = k_subject;
        !            29:    i = k_pos;
        !            30:    
        !            31:    /*
        !            32:     * Fail if &subject[&pos:0] is not of sufficient length to contain x.
        !            33:     */
        !            34:    j = STRLEN(k_subject) - i + 1;
        !            35:    if (j < STRLEN(arg1))
        !            36:       fail();
        !            37: 
        !            38:    /*
        !            39:     * Get pointers to x (s1) and &subject (s2).  Compare them on a bytewise
        !            40:     *  basis and fail if s1 doesn't match s2 for *s1 characters.
        !            41:     */
        !            42:    s1 = STRLOC(arg1);
        !            43:    s2 = STRLOC(k_subject) + i - 1;
        !            44:    l = STRLEN(arg1);
        !            45:    while (l-- > 0) {
        !            46:       if (*s1++ != *s2++)
        !            47:          fail();
        !            48:       }
        !            49: 
        !            50:    /*
        !            51:     * Increment &pos to tab over the matched string and suspend the
        !            52:     *  matched string.
        !            53:     */
        !            54:    l = STRLEN(arg1);
        !            55:    k_pos += l;
        !            56:    arg0 = arg1;
        !            57:    suspend();
        !            58: 
        !            59:    /*
        !            60:     * tabmat has been resumed, restore &subject and &pos and fail.
        !            61:     */
        !            62:    k_subject = oldsubj;
        !            63:    k_pos = i;
        !            64:    fail();
        !            65:    }
        !            66: 
        !            67: Opblockx(tabmat,2,"=",1)

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