1 /* $OpenBSD: lib_newterm.c,v 1.13 2010/01/12 23:22:06 nicm Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998-2007,2008 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: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 33 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 34 * and: Thomas E. Dickey 1996-on * 35 ****************************************************************************/ 36 37 /* 38 ** lib_newterm.c 39 ** 40 ** The newterm() function. 41 ** 42 */ 43 44 #include <curses.priv.h> 45 46 #if SVR4_TERMIO && !defined(_POSIX_SOURCE) 47 #define _POSIX_SOURCE 48 #endif 49 50 #include <term.h> /* clear_screen, cup & friends, cur_term */ 51 #include <tic.h> 52 53 MODULE_ID("$Id: lib_newterm.c,v 1.13 2010/01/12 23:22:06 nicm Exp $") 54 55 #ifndef ONLCR /* Allows compilation under the QNX 4.2 OS */ 56 #define ONLCR 0 57 #endif 58 59 /* 60 * SVr4/XSI Curses specify that hardware echo is turned off in initscr, and not 61 * restored during the curses session. The library simulates echo in software. 62 * (The behavior is unspecified if the application enables hardware echo). 63 * 64 * The newterm function also initializes terminal settings, and since initscr 65 * is supposed to behave as if it calls newterm, we do it here. 66 */ 67 static NCURSES_INLINE int 68 _nc_initscr(void) 69 { 70 int result = ERR; 71 72 /* for extended XPG4 conformance requires cbreak() at this point */ 73 /* (SVr4 curses does this anyway) */ 74 if (cbreak() == OK) { 75 TTY buf; 76 77 buf = cur_term->Nttyb; 78 #ifdef TERMIOS 79 buf.c_lflag &= ~(ECHO | ECHONL); 80 buf.c_iflag &= ~(ICRNL | INLCR | IGNCR); 81 buf.c_oflag &= ~(ONLCR); 82 #elif HAVE_SGTTY_H 83 buf.sg_flags &= ~(ECHO | CRMOD); 84 #else 85 memset(&buf, 0, sizeof(buf)); 86 #endif 87 if ((result = _nc_set_tty_mode(&buf)) == OK) 88 cur_term->Nttyb = buf; 89 } 90 return result; 91 } 92 93 /* 94 * filter() has to be called before either initscr() or newterm(), so there is 95 * apparently no way to make this flag apply to some terminals and not others, 96 * aside from possibly delaying a filter() call until some terminals have been 97 * initialized. 98 */ 99 NCURSES_EXPORT(void) 100 filter(void) 101 { 102 START_TRACE(); 103 T((T_CALLED("filter"))); 104 _nc_prescreen.filter_mode = TRUE; 105 returnVoid; 106 } 107 108 #if NCURSES_EXT_FUNCS 109 /* 110 * An extension, allowing the application to open a new screen without 111 * requiring it to also be filtered. 112 */ 113 NCURSES_EXPORT(void) 114 nofilter(void) 115 { 116 START_TRACE(); 117 T((T_CALLED("nofilter"))); 118 _nc_prescreen.filter_mode = FALSE; 119 returnVoid; 120 } 121 #endif 122 123 NCURSES_EXPORT(SCREEN *) 124 newterm(NCURSES_CONST char *name, FILE *ofp, FILE *ifp) 125 { 126 int value; 127 int errret; 128 SCREEN *current; 129 SCREEN *result = 0; 130 TERMINAL *its_term; 131 132 START_TRACE(); 133 T((T_CALLED("newterm(\"%s\",%p,%p)"), name, ofp, ifp)); 134 135 _nc_init_pthreads(); 136 _nc_lock_global(curses); 137 138 current = SP; 139 its_term = (SP ? SP->_term : 0); 140 141 /* this loads the capability entry, then sets LINES and COLS */ 142 if (setupterm(name, fileno(ofp), &errret) != ERR) { 143 int slk_format = _nc_globals.slk_format; 144 145 /* 146 * This actually allocates the screen structure, and saves the original 147 * terminal settings. 148 */ 149 _nc_set_screen(0); 150 151 /* allow user to set maximum escape delay from the environment */ 152 if ((value = _nc_getenv_num("ESCDELAY")) >= 0) { 153 set_escdelay(value); 154 } 155 156 if (_nc_setupscreen(LINES, 157 COLS, 158 ofp, 159 _nc_prescreen.filter_mode, 160 slk_format) == ERR) { 161 _nc_set_screen(current); 162 result = 0; 163 } else { 164 assert(SP != 0); 165 /* 166 * In setupterm() we did a set_curterm(), but it was before we set 167 * SP. So the "current" screen's terminal pointer was overwritten 168 * with a different terminal. Later, in _nc_setupscreen(), we set 169 * SP and the terminal pointer in the new screen. 170 * 171 * Restore the terminal-pointer for the pre-existing screen, if 172 * any. 173 */ 174 if (current) 175 current->_term = its_term; 176 177 /* if the terminal type has real soft labels, set those up */ 178 if (slk_format && num_labels > 0 && SLK_STDFMT(slk_format)) 179 _nc_slk_initialize(stdscr, COLS); 180 181 SP->_ifd = fileno(ifp); 182 typeahead(fileno(ifp)); 183 #ifdef TERMIOS 184 SP->_use_meta = ((cur_term->Ottyb.c_cflag & CSIZE) == CS8 && 185 !(cur_term->Ottyb.c_iflag & ISTRIP)); 186 #else 187 SP->_use_meta = FALSE; 188 #endif 189 SP->_endwin = FALSE; 190 191 /* 192 * Check whether we can optimize scrolling under dumb terminals in 193 * case we do not have any of these capabilities, scrolling 194 * optimization will be useless. 195 */ 196 SP->_scrolling = ((scroll_forward && scroll_reverse) || 197 ((parm_rindex || 198 parm_insert_line || 199 insert_line) && 200 (parm_index || 201 parm_delete_line || 202 delete_line))); 203 204 baudrate(); /* sets a field in the SP structure */ 205 206 SP->_keytry = 0; 207 208 /* 209 * Check for mismatched graphic-rendition capabilities. Most SVr4 210 * terminfo trees contain entries that have rmul or rmso equated to 211 * sgr0 (Solaris curses copes with those entries). We do this only 212 * for curses, since many termcap applications assume that 213 * smso/rmso and smul/rmul are paired, and will not function 214 * properly if we remove rmso or rmul. Curses applications 215 * shouldn't be looking at this detail. 216 */ 217 #define SGR0_TEST(mode) (mode != 0) && (exit_attribute_mode == 0 || strcmp(mode, exit_attribute_mode)) 218 SP->_use_rmso = SGR0_TEST(exit_standout_mode); 219 SP->_use_rmul = SGR0_TEST(exit_underline_mode); 220 221 /* compute movement costs so we can do better move optimization */ 222 _nc_mvcur_init(); 223 224 /* initialize terminal to a sane state */ 225 _nc_screen_init(); 226 227 /* Initialize the terminal line settings. */ 228 _nc_initscr(); 229 230 _nc_signal_handler(TRUE); 231 232 result = SP; 233 } 234 } 235 _nc_unlock_global(curses); 236 returnSP(result); 237 } 238