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Annotation of researchv10no/cmd/basic/bite/src/update.c, revision 1.1

1.1     ! root        1: /* Copyright Bell Telephone Laboratories Whippany, N.J.
        !             2: 
        !             3:  *     ***********************************
        !             4:  *     ***********************************
        !             5:  *     ****** UPDATE THE PAGE INDEX ******
        !             6:  *     *** R. B. Drake WH 8C-005 X4163 ***
        !             7:  *     **** Sun Aug 26 12:02:08 1979 *****
        !             8:  *     ***********************************
        !             9:  *     ***********************************
        !            10: 
        !            11: */
        !            12: /*   "@(#) update.c:  V 1.1  12/21/80" */
        !            13: 
        !            14: /* after a shift of the lines in the program txtbuf, that portion of
        !            15:  * the page index from the current page upward must be rebuilt or
        !            16:  * "updated" */
        !            17: #include "bas.h"
        !            18: 
        !            19: update()
        !            20: {
        !            21: char *uptr;
        !            22:        if(index[pg].maxlin == 0)
        !            23:                uptr = txtbuf;
        !            24:        else
        !            25:        uptr = index[pg].begin;
        !            26:        while(1)
        !            27:        {
        !            28:                pg = (uptr - txtbuf) /PGSIZ;
        !            29:                if(fetch(-1,&uptr) != 0) return(0);
        !            30:                if(index[pg].maxlin == 0)
        !            31:                {
        !            32:                        index[pg].maxlin = inst.thing.linno;
        !            33:                        index[pg].begin = curptr;
        !            34:                }
        !            35:                if(inst.thing.linno > index[pg].maxlin)
        !            36:                        index[pg].maxlin = inst.thing.linno;
        !            37:        }
        !            38: }

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