BSD 4_3 release

[unix-history] / usr / src / usr.lib / libcurses / newwin.c

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
static char sccsid[] = "@(#)newwin.c    5.1 (Berkeley) 6/7/85";
#endif not lint

/*
* allocate space for and set up defaults for a new window
*
*/

# include       "curses.ext"

char    *malloc();

# define        SMALLOC (short *) malloc

static WINDOW   *makenew();

# undef         nl      /* don't need it here, and it interferes        */

WINDOW *
newwin(num_lines, num_cols, begy, begx)
int     num_lines, num_cols, begy, begx;
{
       reg WINDOW      *win;
       reg char        *sp;
       reg int         i, by, bx, nl, nc;
       reg int         j;

       by = begy;
       bx = begx;
       nl = num_lines;
       nc = num_cols;

       if (nl == 0)
               nl = LINES - by;
       if (nc == 0)
               nc = COLS - bx;
       if ((win = makenew(nl, nc, by, bx)) == NULL)
               return ERR;
       if ((win->_firstch = SMALLOC(nl * sizeof win->_firstch[0])) == NULL) {
               free(win->_y);
               free(win);
               return NULL;
       }
       if ((win->_lastch = SMALLOC(nl * sizeof win->_lastch[0])) == NULL) {
               free(win->_y);
               free(win->_firstch);
               free(win);
               return NULL;
       }
       win->_nextp = win;
       for (i = 0; i < nl; i++) {
               win->_firstch[i] = _NOCHANGE;
               win->_lastch[i] = _NOCHANGE;
       }
       for (i = 0; i < nl; i++)
               if ((win->_y[i] = malloc(nc * sizeof win->_y[0])) == NULL) {
                       for (j = 0; j < i; j++)
                               free(win->_y[j]);
                       free(win->_firstch);
                       free(win->_lastch);
                       free(win->_y);
                       free(win);
                       return ERR;
               }
               else
                       for (sp = win->_y[i]; sp < win->_y[i] + nc; )
                               *sp++ = ' ';
       win->_ch_off = 0;
# ifdef DEBUG
       fprintf(outf, "NEWWIN: win->_ch_off = %d\n", win->_ch_off);
# endif
       return win;
}

WINDOW *
subwin(orig, num_lines, num_cols, begy, begx)
reg WINDOW      *orig;
int             num_lines, num_cols, begy, begx;
{
       reg int         i;
       reg WINDOW      *win;
       reg int         by, bx, nl, nc;

       by = begy;
       bx = begx;
       nl = num_lines;
       nc = num_cols;

       /*
        * make sure window fits inside the original one
        */
# ifdef DEBUG
       fprintf(outf, "SUBWIN(%0.2o, %d, %d, %d, %d)\n", orig, nl, nc, by, bx);
# endif
       if (by < orig->_begy || bx < orig->_begx
           || by + nl > orig->_maxy + orig->_begy
           || bx + nc > orig->_maxx + orig->_begx)
               return ERR;
       if (nl == 0)
               nl = orig->_maxy + orig->_begy - by;
       if (nc == 0)
               nc = orig->_maxx + orig->_begx - bx;
       if ((win = makenew(nl, nc, by, bx)) == NULL)
               return ERR;
       win->_nextp = orig->_nextp;
       orig->_nextp = win;
       win->_orig = orig;
       _set_subwin_(orig, win);
       return win;
}

/*
* this code is shared with mvwin()
*/
_set_subwin_(orig, win)
register WINDOW *orig, *win;
{
       register int    i, j, k;

       j = win->_begy - orig->_begy;
       k = win->_begx - orig->_begx;
       win->_ch_off = k;
# ifdef DEBUG
       fprintf(outf, "_SET_SUBWIN_: win->_ch_off = %d\n", win->_ch_off);
# endif
       win->_firstch = &orig->_firstch[j];
       win->_lastch = &orig->_lastch[j];
       for (i = 0; i < win->_maxy; i++, j++)
               win->_y[i] = &orig->_y[j][k];

}

/*
*      This routine sets up a window buffer and returns a pointer to it.
*/
static WINDOW *
makenew(num_lines, num_cols, begy, begx)
int     num_lines, num_cols, begy, begx; {

       reg int         i;
       reg WINDOW      *win;
       reg int         by, bx, nl, nc;

       by = begy;
       bx = begx;
       nl = num_lines;
       nc = num_cols;

# ifdef DEBUG
       fprintf(outf, "MAKENEW(%d, %d, %d, %d)\n", nl, nc, by, bx);
# endif
       if ((win = (WINDOW *) malloc(sizeof *win)) == NULL)
               return NULL;
# ifdef DEBUG
       fprintf(outf, "MAKENEW: nl = %d\n", nl);
# endif
       if ((win->_y = (char **) malloc(nl * sizeof win->_y[0])) == NULL) {
               free(win);
               return NULL;
       }
# ifdef DEBUG
       fprintf(outf, "MAKENEW: nc = %d\n", nc);
# endif
       win->_cury = win->_curx = 0;
       win->_clear = FALSE;
       win->_maxy = nl;
       win->_maxx = nc;
       win->_begy = by;
       win->_begx = bx;
       win->_flags = 0;
       win->_scroll = win->_leave = FALSE;
       _swflags_(win);
# ifdef DEBUG
       fprintf(outf, "MAKENEW: win->_clear = %d\n", win->_clear);
       fprintf(outf, "MAKENEW: win->_leave = %d\n", win->_leave);
       fprintf(outf, "MAKENEW: win->_scroll = %d\n", win->_scroll);
       fprintf(outf, "MAKENEW: win->_flags = %0.2o\n", win->_flags);
       fprintf(outf, "MAKENEW: win->_maxy = %d\n", win->_maxy);
       fprintf(outf, "MAKENEW: win->_maxx = %d\n", win->_maxx);
       fprintf(outf, "MAKENEW: win->_begy = %d\n", win->_begy);
       fprintf(outf, "MAKENEW: win->_begx = %d\n", win->_begx);
# endif
       return win;
}

_swflags_(win)
register WINDOW *win;
{
       win->_flags &= ~(_ENDLINE|_FULLLINE|_FULLWIN|_SCROLLWIN);
       if (win->_begx + win->_maxx == COLS) {
               win->_flags |= _ENDLINE;
               if (win->_begx == 0) {
                       if (AL && DL)
                               win->_flags |= _FULLLINE;
                       if (win->_maxy == LINES && win->_begy == 0)
                               win->_flags |= _FULLWIN;
               }
               if (win->_begy + win->_maxy == LINES)
                       win->_flags |= _SCROLLWIN;
       }
}