1 /* $OpenBSD: resizeterm.c,v 1.2 2001/01/22 18:01:48 millert Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998,2000 Free Software Foundation, Inc. * 5 * * 6 * Permission is hereby granted, free of charge, to any person obtaining a * 7 * copy of this software and associated documentation files (the * 8 * "Software"), to deal in the Software without restriction, including * 9 * without limitation the rights to use, copy, modify, merge, publish, * 10 * distribute, distribute with modifications, sublicense, and/or sell * 11 * copies of the Software, and to permit persons to whom the Software is * 12 * furnished to do so, subject to the following conditions: * 13 * * 14 * The above copyright notice and this permission notice shall be included * 15 * in all copies or substantial portions of the Software. * 16 * * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 24 * * 25 * Except as contained in this notice, the name(s) of the above copyright * 26 * holders shall not be used in advertising or otherwise to promote the * 27 * sale, use or other dealings in this Software without prior written * 28 * authorization. * 29 ****************************************************************************/ 30 31 /**************************************************************************** 32 * Author: Thomas E. Dickey <dickey@clark.net> 1996,1997 * 33 ****************************************************************************/ 34 35 /* 36 * This is an extension to the curses library. It provides callers with a hook 37 * into the NCURSES data to resize windows, primarily for use by programs 38 * running in an X Window terminal (e.g., xterm). I abstracted this module 39 * from my application library for NCURSES because it must be compiled with 40 * the private data structures -- T.Dickey 1995/7/4. 41 */ 42 43 #include <curses.priv.h> 44 #include <term.h> 45 46 MODULE_ID("$From: resizeterm.c,v 1.9 2000/12/10 02:43:28 tom Exp $") 47 48 /* 49 * This function reallocates NCURSES window structures. It is invoked in 50 * response to a SIGWINCH interrupt. Other user-defined windows may also need 51 * to be reallocated. 52 * 53 * Because this performs memory allocation, it should not (in general) be 54 * invoked directly from the signal handler. 55 */ 56 NCURSES_EXPORT(int) 57 resizeterm(int ToLines, int ToCols) 58 { 59 int stolen = screen_lines - SP->_lines_avail; 60 int bottom = screen_lines + SP->_topstolen - stolen; 61 62 T((T_CALLED("resizeterm(%d,%d) old(%d,%d)"), 63 ToLines, ToCols, 64 screen_lines, screen_columns)); 65 66 SP->_sig_winch = FALSE; 67 68 if (ToLines != screen_lines 69 || ToCols != screen_columns) { 70 WINDOWLIST *wp; 71 72 #if USE_SIGWINCH 73 ungetch(KEY_RESIZE); /* so application can know this */ 74 clearok(curscr, TRUE); /* screen contents are unknown */ 75 #endif 76 77 for (wp = _nc_windows; wp != 0; wp = wp->next) { 78 WINDOW *win = wp->win; 79 int myLines = win->_maxy + 1; 80 int myCols = win->_maxx + 1; 81 82 /* pads aren't treated this way */ 83 if (win->_flags & _ISPAD) 84 continue; 85 86 if (win->_begy >= bottom) { 87 win->_begy += (ToLines - screen_lines); 88 } else { 89 if (myLines == screen_lines - stolen 90 && ToLines != screen_lines) 91 myLines = ToLines - stolen; 92 else if (myLines == screen_lines 93 && ToLines != screen_lines) 94 myLines = ToLines; 95 } 96 97 if (myCols == screen_columns 98 && ToCols != screen_columns) 99 myCols = ToCols; 100 101 if (wresize(win, myLines, myCols) != OK) 102 returnCode(ERR); 103 } 104 105 screen_lines = lines = ToLines; 106 screen_columns = columns = ToCols; 107 108 SP->_lines_avail = lines - stolen; 109 110 if (SP->oldhash) { 111 FreeAndNull(SP->oldhash); 112 } 113 if (SP->newhash) { 114 FreeAndNull(SP->newhash); 115 } 116 } 117 118 /* 119 * Always update LINES, to allow for call from lib_doupdate.c which 120 * needs to have the count adjusted by the stolen (ripped off) lines. 121 */ 122 LINES = ToLines - stolen; 123 COLS = ToCols; 124 125 returnCode(OK); 126 } 127