date and time created 81/01/26 17:03:04 by arnold

SCCS-vsn: lib/libcurses/newwin.c 1.1

diff --git a/usr/src/lib/libcurses/newwin.c b/usr/src/lib/libcurses/newwin.c
new file mode 100644 (file)
index 0000000..57fd77e
--- /dev/null
+++ b/usr/src/lib/libcurses/newwin.c
@@ -0,0 +1,158 @@
+/*
+ * allocate space for and set up defaults for a new window
+ *
+ * %G% (Berkeley) %W
+ */
+
+# include      "curses.ext"
+
+short  *calloc();
+WINDOW *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;
+
+       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;
+       for (i = 0; i < nl; i++)
+               if ((win->_y[i] = (char *) calloc(nc, sizeof (char))) == NULL) {
+                       reg int         j;
+
+                       for (j = 0; j < i; j++)
+                               cfree(win->_y[j]);
+                       cfree(win->_firstch);
+                       cfree(win->_lastch);
+                       cfree(win->_y);
+                       cfree(win);
+                       return ERR;
+               }
+               else
+                       for (sp = win->_y[i]; sp < win->_y[i] + nc; )
+                               *sp++ = ' ';
+       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;
+       reg int         j, k;
+
+       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 || bx + nc > orig->_maxx)
+               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;
+       j = orig->_begy + by;
+       k = orig->_begx + bx;
+       for (i = 0; i < nl; i++)
+               win->_y[i] = &orig->_y[j++][k];
+       win->_flags = _SUBWIN;
+       return win;
+}
+
+/*
+ *     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 (WINDOW))) == NULL)
+               return NULL;
+# ifdef DEBUG
+       fprintf(outf, "MAKENEW: nl = %d\n", nl);
+# endif
+       if ((win->_y = (char **) calloc(nl, sizeof (char *))) == NULL) {
+               cfree(win);
+               return (WINDOW *) NULL;
+       }
+       if ((win->_firstch = calloc(nl, sizeof (short))) == NULL) {
+               cfree(win);
+               cfree(win->_y);
+       }
+       if ((win->_lastch = calloc(nl, sizeof (short))) == NULL) {
+               cfree(win);
+               cfree(win->_y);
+               cfree(win->_firstch);
+       }
+# ifdef DEBUG
+       fprintf(outf, "MAKENEW: nc = %d\n", nc);
+# endif
+       win->_cury = win->_curx = 0;
+       win->_clear = (nl == LINES && nc == COLS);
+       win->_maxy = nl;
+       win->_maxx = nc;
+       win->_begy = by;
+       win->_begx = bx;
+       win->_scroll = win->_leave = FALSE;
+       for (i = 0; i < nl; i++)
+               win->_firstch[i] = win->_lastch[i] = _NOCHANGE;
+       if (bx + nc == COLS) {
+               win->_flags |= _ENDLINE;
+               if (bx == 0 && nl == LINES && by == 0)
+                       win->_flags |= _FULLWIN;
+               if (by + nl == LINES)
+                       win->_flags |= _SCROLLWIN;
+       }
+# 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;
+}