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Annotation of researchv10no/ncurses/screen/_scrdown.c, revision 1.1

1.1     ! root        1: /*     @(#) _scrdown.c: 1.1 10/15/83   (1.9    10/27/82)       */
        !             2: 
        !             3: #include "curses.ext"
        !             4: 
        !             5: /*
        !             6:  * Scroll the screen down (e.g. in the normal direction of text) one line
        !             7:  * physically, and update the internal notion of what's on the screen
        !             8:  * (SP->cur_body) to know about this.  Do it in such a way that we will
        !             9:  * realize this has been done later and take advantage of it.
        !            10:  */
        !            11: _scrdown()
        !            12: {
        !            13:        struct line *old_d, *old_p;
        !            14:        register int i, l=lines;
        !            15: 
        !            16: #ifdef DEBUG
        !            17:        if(outf)
        !            18:        {
        !            19:                fprintf(outf, "_scrdown()\n");
        !            20:                fprintf( outf, "\tDoing _pos( %d, 0 )\n", lines - 1 );
        !            21:                fprintf( outf, "\tDoing _scrollf(1)\n" );
        !            22:        }
        !            23: #endif
        !            24: 
        !            25:        /* physically... */
        !            26:        _pos(lines-1, 0);
        !            27:        _scrollf(1);
        !            28: 
        !            29:        /* internally */
        !            30:        old_d = SP->std_body[1];
        !            31:        old_p = SP->cur_body[1];
        !            32: #ifdef DEBUG
        !            33:        if(outf)
        !            34:        {
        !            35:                fprintf( outf, "lines = l = %d\n", l );
        !            36:        }
        !            37: #endif DEBUG
        !            38: 
        !            39:        for( i=1; i<=l; i++ )
        !            40:        {
        !            41:                SP->std_body[i] = SP->std_body[i+1];
        !            42:                SP->cur_body[i] = SP->cur_body[i+1];
        !            43:        }
        !            44:        SP->std_body[1] = NULL;
        !            45:        SP->cur_body[1] = NULL;
        !            46:        _line_free(old_d);
        !            47:        if( old_d != old_p )
        !            48:        {
        !            49:                _line_free(old_p);
        !            50:        }
        !            51: }

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