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Annotation of researchv10dc/ncurses/screen/subwin.c, revision 1.1

1.1     ! root        1: # include      "curses.ext"
        !             2: # include      <signal.h>
        !             3: /*     @(#) subwin.c: 1.1 10/15/83     (1.17   3/16/83)        */
        !             4: 
        !             5: char   *calloc();
        !             6: char   *malloc();
        !             7: extern char    *getenv();
        !             8: 
        !             9: extern WINDOW  *makenew();
        !            10: 
        !            11: WINDOW *
        !            12: subwin(orig, num_lines, num_cols, begy, begx)
        !            13: register WINDOW        *orig;
        !            14: int    num_lines, num_cols, begy, begx;
        !            15: {
        !            16: 
        !            17:        register int i;
        !            18:        register WINDOW *win;
        !            19:        register int by, bx, nlines, ncols;
        !            20:        register int j, k;
        !            21: 
        !            22:        by = begy;
        !            23:        bx = begx;
        !            24:        nlines = num_lines;
        !            25:        ncols = num_cols;
        !            26: 
        !            27:        /*
        !            28:         * make sure window fits inside the original one
        !            29:         */
        !            30: # ifdef        DEBUG
        !            31:        if(outf) fprintf(outf, "SUBWIN(%0.2o, %d, %d, %d, %d)\n", orig, nlines, ncols, by, bx);
        !            32: # endif
        !            33:        if (by < orig->_begy || bx < orig->_begx
        !            34:            || by + nlines > orig->_begy + orig->_maxy
        !            35:            || bx + ncols  > orig->_begx + orig->_maxx)
        !            36:                return NULL;
        !            37:        if (nlines == 0)
        !            38:                nlines = orig->_maxy - orig->_begy - by;
        !            39:        if (ncols == 0)
        !            40:                ncols = orig->_maxx - orig->_begx - bx;
        !            41:        if ((win = makenew(nlines, ncols, by, bx)) == NULL)
        !            42:                return NULL;
        !            43:        j = by - orig->_begy;
        !            44:        k = bx - orig->_begx;
        !            45:        for (i = 0; i < nlines; i++)
        !            46:                win->_y[i] = &orig->_y[j++][k];
        !            47:        win->_flags = _SUBWIN;
        !            48:        return win;
        !            49: }

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