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Annotation of researchv10no/cmd/basic/bite/src/update.c, revision 1.1.1.1

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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