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Diffstat (limited to 'lib/libcurses/lib_newwin.c')
| -rw-r--r-- | lib/libcurses/lib_newwin.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/lib/libcurses/lib_newwin.c b/lib/libcurses/lib_newwin.c new file mode 100644 index 00000000000..0fd8d16db36 --- /dev/null +++ b/lib/libcurses/lib_newwin.c @@ -0,0 +1,193 @@ + +/*************************************************************************** +* COPYRIGHT NOTICE * +**************************************************************************** +* ncurses is copyright (C) 1992-1995 * +* Zeyd M. Ben-Halim * +* zmbenhal@netcom.com * +* Eric S. Raymond * +* esr@snark.thyrsus.com * +* * +* Permission is hereby granted to reproduce and distribute ncurses * +* by any means and for any fee, whether alone or as part of a * +* larger distribution, in source or in binary form, PROVIDED * +* this notice is included with any such distribution, and is not * +* removed from any of its header files. Mention of ncurses in any * +* applications linked with it is highly appreciated. * +* * +* ncurses comes AS IS with no warranty, implied or expressed. * +* * +***************************************************************************/ + + + +/* +** lib_newwin.c +** +** The routines newwin(), subwin() and their dependent +** +*/ + +#include "curses.priv.h" +#include <stdlib.h> + +WINDOW * newwin(int num_lines, int num_columns, int begy, int begx) +{ +WINDOW *win; +chtype *ptr; +int i, j; + + T(("newwin(%d,%d,%d,%d) called", num_lines, num_columns, begy, begx)); + + if (num_lines == 0) + num_lines = screen_lines - begy; + if (num_columns == 0) + num_columns = screen_columns - begx; + + if (num_columns + begx > SP->_columns || num_lines + begy > SP->_lines) + return NULL; + + if ((win = _nc_makenew(num_lines, num_columns, begy, begx)) == NULL) + return NULL; + + for (i = 0; i < num_lines; i++) { + if ((win->_line[i].text = (chtype *) calloc((unsigned)num_columns, sizeof(chtype))) == NULL) { + for (j = 0; j < i; j++) + free(win->_line[j].text); + + free(win->_line); + free(win); + + return NULL; + } + else + for (ptr = win->_line[i].text; ptr < win->_line[i].text + num_columns; ) + *ptr++ = ' '; + } + + T(("newwin: returned window is %p", win)); + + return(win); +} + +WINDOW * derwin(WINDOW *orig, int num_lines, int num_columns, int begy, int begx) +{ +WINDOW *win; +int i; + + T(("derwin(%p, %d,%d,%d,%d) called", orig, num_lines, num_columns, begy, begx)); + + /* + ** make sure window fits inside the original one + */ + if ( begy < 0 || begx < 0) + return NULL; + if ( begy + num_lines > orig->_maxy + 1 + || begx + num_columns > orig->_maxx + 1) + return NULL; + + if (num_lines == 0) + num_lines = orig->_maxy - begy; + + if (num_columns == 0) + num_columns = orig->_maxx - begx; + + if ((win = _nc_makenew(num_lines, num_columns, orig->_begy + begy, orig->_begx + begx)) == NULL) + return NULL; + + win->_pary = begy; + win->_parx = begx; + win->_attrs = orig->_attrs; + win->_bkgd = orig->_bkgd; + + for (i = 0; i < num_lines; i++) + win->_line[i].text = &orig->_line[begy++].text[begx]; + + win->_flags = _SUBWIN; + win->_parent = orig; + + T(("derwin: returned window is %p", win)); + + return(win); +} + + +WINDOW *subwin(WINDOW *w, int l, int c, int y, int x) +{ + T(("subwin(%p, %d, %d, %d, %d) called", w, l, c, y, x)); + T(("parent has begy = %d, begx = %d", w->_begy, w->_begx)); + + return derwin(w, l, c, y - w->_begy, x - w->_begx); +} + +WINDOW * +_nc_makenew(int num_lines, int num_columns, int begy, int begx) +{ +int i; +WINDOW *win; + + T(("_nc_makenew(%d,%d,%d,%d)", num_lines, num_columns, begy, begx)); + + if (num_lines <= 0 || num_columns <= 0) + return NULL; + + if ((win = (WINDOW *) calloc(1, sizeof(WINDOW))) == NULL) + return NULL; + + if ((win->_line = (struct ldat *) calloc((unsigned)num_lines, sizeof (struct ldat))) == NULL) { + free(win); + return NULL; + } + + win->_curx = 0; + win->_cury = 0; + win->_maxy = num_lines - 1; + win->_maxx = num_columns - 1; + win->_begy = begy; + win->_begx = begx; + + win->_flags = 0; + win->_attrs = A_NORMAL; + win->_bkgd = A_NORMAL; + + win->_clear = (num_lines == screen_lines && num_columns == screen_columns); + win->_idlok = FALSE; + win->_idcok = TRUE; + win->_scroll = FALSE; + win->_leaveok = FALSE; + win->_use_keypad = FALSE; + win->_delay = -1; + win->_immed = FALSE; + win->_sync = 0; + win->_parx = -1; + win->_pary = -1; + win->_parent = (WINDOW *)NULL; + + win->_regtop = 0; + win->_regbottom = num_lines - 1; + + win->_pad._pad_y = -1; + win->_pad._pad_x = -1; + win->_pad._pad_top = -1; + win->_pad._pad_bottom = -1; + win->_pad._pad_left = -1; + win->_pad._pad_right = -1; + + for (i = 0; i < num_lines; i++) + { + win->_line[i].firstchar = win->_line[i].lastchar = _NOCHANGE; + win->_line[i].oldindex = i; + } + + if (begx + num_columns == screen_columns) { + win->_flags |= _ENDLINE; + + if (begx == 0 && num_lines == screen_lines && begy == 0) + win->_flags |= _FULLWIN; + + if (begy + num_lines == screen_lines) + win->_flags |= _SCROLLWIN; + } + + return(win); +} |