1 /**************************************************************************** 2 * Copyright (c) 1998 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 28 29 /**************************************************************************** 30 * Author: Thomas E. Dickey <dickey@clark.net> 1996,1997 * 31 ****************************************************************************/ 32 33 /* 34 * This is an extension to the curses library. It provides callers with a hook 35 * into the NCURSES data to resize windows, primarily for use by programs 36 * running in an X Window terminal (e.g., xterm). I abstracted this module 37 * from my application library for NCURSES because it must be compiled with 38 * the private data structures -- T.Dickey 1995/7/4. 39 */ 40 41 #include <curses.priv.h> 42 #include <term.h> 43 44 MODULE_ID("$Id: resizeterm.c,v 1.7 1998/09/19 19:27:43 Alexander.V.Lukyanov Exp $") 45 46 /* 47 * This function reallocates NCURSES window structures. It is invoked in 48 * response to a SIGWINCH interrupt. Other user-defined windows may also need 49 * to be reallocated. 50 * 51 * Because this performs memory allocation, it should not (in general) be 52 * invoked directly from the signal handler. 53 */ 54 int 55 resizeterm(int ToLines, int ToCols) 56 { 57 int stolen = screen_lines - SP->_lines_avail; 58 int bottom = screen_lines + SP->_topstolen - stolen; 59 60 T((T_CALLED("resizeterm(%d,%d) old(%d,%d)"), 61 ToLines, ToCols, 62 screen_lines, screen_columns)); 63 64 SP->_sig_winch = FALSE; 65 66 if (ToLines != screen_lines 67 || ToCols != screen_columns) { 68 WINDOWLIST *wp; 69 70 #if USE_SIGWINCH 71 ungetch(KEY_RESIZE); /* so application can know this */ 72 clearok(curscr, TRUE); /* screen contents are unknown */ 73 #endif 74 75 for (wp = _nc_windows; wp != 0; wp = wp->next) { 76 WINDOW *win = wp->win; 77 int myLines = win->_maxy + 1; 78 int myCols = win->_maxx + 1; 79 80 /* pads aren't treated this way */ 81 if (win->_flags & _ISPAD) 82 continue; 83 84 if (win->_begy >= bottom) { 85 win->_begy += (ToLines - screen_lines); 86 } else { 87 if (myLines == screen_lines - stolen 88 && ToLines != screen_lines) 89 myLines = ToLines - stolen; 90 else 91 if (myLines == screen_lines 92 && ToLines != screen_lines) 93 myLines = ToLines; 94 } 95 96 if (myCols == screen_columns 97 && ToCols != screen_columns) 98 myCols = ToCols; 99 100 if (wresize(win, myLines, myCols) != OK) 101 returnCode(ERR); 102 } 103 104 screen_lines = lines = ToLines; 105 screen_columns = columns = ToCols; 106 107 SP->_lines_avail = lines - stolen; 108 109 if (SP->oldhash) { FreeAndNull(SP->oldhash); } 110 if (SP->newhash) { FreeAndNull(SP->newhash); } 111 } 112 113 /* 114 * Always update LINES, to allow for call from lib_doupdate.c which 115 * needs to have the count adjusted by the stolen (ripped off) lines. 116 */ 117 LINES = ToLines - stolen; 118 COLS = ToCols; 119 120 returnCode(OK); 121 } 122