diff options
Diffstat (limited to 'contrib/ncurses/ncurses/base/lib_scroll.c')
| -rw-r--r-- | contrib/ncurses/ncurses/base/lib_scroll.c | 88 |
1 files changed, 59 insertions, 29 deletions
diff --git a/contrib/ncurses/ncurses/base/lib_scroll.c b/contrib/ncurses/ncurses/base/lib_scroll.c index dcde0fc3f7e4..39c62d0850e5 100644 --- a/contrib/ncurses/ncurses/base/lib_scroll.c +++ b/contrib/ncurses/ncurses/base/lib_scroll.c @@ -1,5 +1,5 @@ /**************************************************************************** - * Copyright (c) 1998,2000 Free Software Foundation, Inc. * + * Copyright (c) 1998,2000,2001 Free Software Foundation, Inc. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the * @@ -27,7 +27,8 @@ ****************************************************************************/ /**************************************************************************** - * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * + * Author: Thomas E. Dickey 1996-2001 * + * and: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * * and: Eric S. Raymond <esr@snark.thyrsus.com> * ****************************************************************************/ @@ -42,18 +43,26 @@ #include <curses.priv.h> -MODULE_ID("$Id: lib_scroll.c,v 1.20 2000/12/10 02:54:03 tom Exp $") +MODULE_ID("$Id: lib_scroll.c,v 1.23 2001/12/19 01:06:55 tom Exp $") NCURSES_EXPORT(void) -_nc_scroll_window -(WINDOW *win, int const n, NCURSES_SIZE_T const top, - NCURSES_SIZE_T const bottom, chtype blank) +_nc_scroll_window(WINDOW *win, int const n, NCURSES_SIZE_T const top, + NCURSES_SIZE_T const bottom, NCURSES_CH_T blank) { - int line, j; - size_t to_copy = (size_t) (sizeof(chtype) * (win->_maxx + 1)); + int limit; + int line; + int j; + size_t to_copy = (size_t) (sizeof(NCURSES_CH_T) * (win->_maxx + 1)); TR(TRACE_MOVE, ("_nc_scroll_window(%p, %d, %d, %d)", win, n, top, bottom)); + if (top < 0 + || bottom < top + || bottom > win->_maxy) { + TR(TRACE_MOVE, ("nothing to scroll")); + return; + } + /* * This used to do a line-text pointer-shuffle instead of text copies. * That (a) doesn't work when the window is derived and doesn't have @@ -67,15 +76,26 @@ _nc_scroll_window /* shift n lines downwards */ if (n < 0) { - for (line = bottom; line >= top - n; line--) { - memcpy(win->_line[line].text, - win->_line[line + n].text, - to_copy); - if_USE_SCROLL_HINTS( - win->_line[line].oldindex = - win->_line[line + n].oldindex); + limit = top - n; + if (limit > win->_maxy) + limit = win->_maxy; + for (line = bottom; line >= limit; line--) { + if (line + n >= 0) { + TR(TRACE_MOVE, ("...copying %d to %d", line + n, line)); + memcpy(win->_line[line].text, + win->_line[line + n].text, + to_copy); + if_USE_SCROLL_HINTS(win->_line[line].oldindex = + win->_line[line + n].oldindex); + } else { + TR(TRACE_MOVE, ("...filling %d", line)); + for (j = 0; j <= win->_maxx; j++) + win->_line[line].text[j] = blank; + if_USE_SCROLL_HINTS(win->_line[line].oldindex = _NEWINDEX); + } } - for (line = top; line < top - n; line++) { + for (line = top; line < limit; line++) { + TR(TRACE_MOVE, ("...filling %d", line)); for (j = 0; j <= win->_maxx; j++) win->_line[line].text[j] = blank; if_USE_SCROLL_HINTS(win->_line[line].oldindex = _NEWINDEX); @@ -84,14 +104,26 @@ _nc_scroll_window /* shift n lines upwards */ if (n > 0) { - for (line = top; line <= bottom - n; line++) { - memcpy(win->_line[line].text, - win->_line[line + n].text, - to_copy); - if_USE_SCROLL_HINTS(win->_line[line].oldindex = - win->_line[line + n].oldindex); + limit = bottom - n; + if (limit < 0) + limit = 0; + for (line = top; line <= limit; line++) { + if (line + n <= win->_maxy) { + TR(TRACE_MOVE, ("...copying %d to %d", line + n, line)); + memcpy(win->_line[line].text, + win->_line[line + n].text, + to_copy); + if_USE_SCROLL_HINTS(win->_line[line].oldindex = + win->_line[line + n].oldindex); + } else { + TR(TRACE_MOVE, ("...filling %d", line)); + for (j = 0; j <= win->_maxx; j++) + win->_line[line].text[j] = blank; + if_USE_SCROLL_HINTS(win->_line[line].oldindex = _NEWINDEX); + } } - for (line = bottom; line > bottom - n; line--) { + for (line = bottom; line > limit; line--) { + TR(TRACE_MOVE, ("...filling %d", line)); for (j = 0; j <= win->_maxx; j++) win->_line[line].text[j] = blank; if_USE_SCROLL_HINTS(win->_line[line].oldindex = _NEWINDEX); @@ -105,17 +137,15 @@ wscrl(WINDOW *win, int n) { T((T_CALLED("wscrl(%p,%d)"), win, n)); - if (!win || !win->_scroll) + if (!win || !win->_scroll) { + TR(TRACE_MOVE, ("...scrollok is false")); returnCode(ERR); + } if (n == 0) returnCode(OK); - if ((n > (win->_regbottom - win->_regtop)) || - (-n > (win->_regbottom - win->_regtop))) - returnCode(ERR); - - _nc_scroll_window(win, n, win->_regtop, win->_regbottom, _nc_background(win)); + _nc_scroll_window(win, n, win->_regtop, win->_regbottom, win->_nc_bkgd); _nc_synchook(win); returnCode(OK); |