tty.c revision 1.6
1 /*- 2 * Copyright (c) 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char sccsid[] = "@(#)tty.c 8.5 (Berkeley) 8/13/94"; 36 #endif /* not lint */ 37 38 #include <stdlib.h> 39 #include <termios.h> 40 #include <unistd.h> 41 42 #include "curses.h" 43 44 /* 45 * In general, curses should leave tty hardware settings alone (speed, parity, 46 * word size). This is most easily done in BSD by using TCSASOFT on all 47 * tcsetattr calls. On other systems, it would be better to get and restore 48 * those attributes at each change, or at least when stopped and restarted. 49 * See also the comments in getterm(). 50 */ 51 #ifdef TCSASOFT 52 int __tcaction = 1; /* Ignore hardware settings. */ 53 #else 54 int __tcaction = 0; 55 #endif 56 57 struct termios __orig_termios, __baset; 58 static struct termios cbreakt, rawt, *curt; 59 static int useraw; 60 61 #ifndef OXTABS 62 #ifdef XTABS /* SMI uses XTABS. */ 63 #define OXTABS XTABS 64 #else 65 #define OXTABS 0 66 #endif 67 #endif 68 69 /* 70 * gettmode -- 71 * Do terminal type initialization. 72 */ 73 int 74 gettmode() 75 { 76 useraw = 0; 77 78 if (tcgetattr(STDIN_FILENO, &__orig_termios)) 79 return (ERR); 80 81 __baset = __orig_termios; 82 __baset.c_oflag &= ~OXTABS; 83 84 GT = 0; /* historical. was used before we wired OXTABS off */ 85 NONL = (__baset.c_oflag & ONLCR) == 0; 86 87 /* 88 * XXX 89 * System V and SMI systems overload VMIN and VTIME, such that 90 * VMIN is the same as the VEOF element, and VTIME is the same 91 * as the VEOL element. This means that, if VEOF was ^D, the 92 * default VMIN is 4. Majorly stupid. 93 */ 94 cbreakt = __baset; 95 cbreakt.c_lflag &= ~ICANON; 96 cbreakt.c_cc[VMIN] = 1; 97 cbreakt.c_cc[VTIME] = 0; 98 99 rawt = cbreakt; 100 rawt.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|INLCR|IGNCR|ICRNL|IXON); 101 rawt.c_oflag &= ~OPOST; 102 rawt.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN); 103 104 /* 105 * In general, curses should leave hardware-related settings alone. 106 * This includes parity and word size. Older versions set the tty 107 * to 8 bits, no parity in raw(), but this is considered to be an 108 * artifact of the old tty interface. If it's desired to change 109 * parity and word size, the TCSASOFT bit has to be removed from the 110 * calls that switch to/from "raw" mode. 111 */ 112 if (!__tcaction) { 113 rawt.c_iflag &= ~ISTRIP; 114 rawt.c_cflag &= ~(CSIZE|PARENB); 115 rawt.c_cflag |= CS8; 116 } 117 118 curt = &__baset; 119 return (tcsetattr(STDIN_FILENO, __tcaction ? 120 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK); 121 } 122 123 int 124 raw() 125 { 126 useraw = __pfast = __rawmode = 1; 127 curt = &rawt; 128 return (tcsetattr(STDIN_FILENO, __tcaction ? 129 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK); 130 } 131 132 int 133 noraw() 134 { 135 useraw = __pfast = __rawmode = 0; 136 curt = &__baset; 137 return (tcsetattr(STDIN_FILENO, __tcaction ? 138 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK); 139 } 140 141 int 142 cbreak() 143 { 144 145 __rawmode = 1; 146 curt = useraw ? &rawt : &cbreakt; 147 return (tcsetattr(STDIN_FILENO, __tcaction ? 148 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK); 149 } 150 151 int 152 nocbreak() 153 { 154 155 __rawmode = 0; 156 curt = useraw ? &rawt : &__baset; 157 return (tcsetattr(STDIN_FILENO, __tcaction ? 158 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK); 159 } 160 161 int 162 echo() 163 { 164 rawt.c_lflag |= ECHO; 165 cbreakt.c_lflag |= ECHO; 166 __baset.c_lflag |= ECHO; 167 168 __echoit = 1; 169 return (tcsetattr(STDIN_FILENO, __tcaction ? 170 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK); 171 } 172 173 int 174 noecho() 175 { 176 rawt.c_lflag &= ~ECHO; 177 cbreakt.c_lflag &= ~ECHO; 178 __baset.c_lflag &= ~ECHO; 179 180 __echoit = 0; 181 return (tcsetattr(STDIN_FILENO, __tcaction ? 182 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK); 183 } 184 185 int 186 nl() 187 { 188 rawt.c_iflag |= ICRNL; 189 rawt.c_oflag |= ONLCR; 190 cbreakt.c_iflag |= ICRNL; 191 cbreakt.c_oflag |= ONLCR; 192 __baset.c_iflag |= ICRNL; 193 __baset.c_oflag |= ONLCR; 194 195 __pfast = __rawmode; 196 return (tcsetattr(STDIN_FILENO, __tcaction ? 197 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK); 198 } 199 200 int 201 nonl() 202 { 203 rawt.c_iflag &= ~ICRNL; 204 rawt.c_oflag &= ~ONLCR; 205 cbreakt.c_iflag &= ~ICRNL; 206 cbreakt.c_oflag &= ~ONLCR; 207 __baset.c_iflag &= ~ICRNL; 208 __baset.c_oflag &= ~ONLCR; 209 210 __pfast = 1; 211 return (tcsetattr(STDIN_FILENO, __tcaction ? 212 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK); 213 } 214 215 void 216 __startwin() 217 { 218 static char *stdbuf; 219 static size_t len; 220 221 (void)fflush(stdout); 222 223 /* 224 * Some C libraries default to a 1K buffer when talking to a tty. 225 * With a larger screen, especially across a network, we'd like 226 * to get it to all flush in a single write. Make it twice as big 227 * as just the characters (so that we have room for cursor motions 228 * and standout information) but no more than 8K. 229 */ 230 if (stdbuf == NULL) { 231 if ((len = LINES * COLS * 2) > 8192) 232 len = 8192; 233 if ((stdbuf = malloc(len)) == NULL) 234 len = 0; 235 } 236 (void)setvbuf(stdout, stdbuf, _IOFBF, len); 237 238 tputs(TI, 0, __cputchar); 239 tputs(VS, 0, __cputchar); 240 } 241 242 int 243 endwin() 244 { 245 __restore_stophandler(); 246 247 if (curscr != NULL) { 248 if (curscr->flags & __WSTANDOUT) { 249 tputs(SE, 0, __cputchar); 250 curscr->flags &= ~__WSTANDOUT; 251 } 252 __mvcur(curscr->cury, curscr->cury, curscr->maxy - 1, 0, 0); 253 } 254 255 (void)tputs(VE, 0, __cputchar); 256 (void)tputs(TE, 0, __cputchar); 257 (void)fflush(stdout); 258 (void)setvbuf(stdout, NULL, _IOLBF, 0); 259 260 return (tcsetattr(STDIN_FILENO, __tcaction ? 261 TCSASOFT | TCSADRAIN : TCSADRAIN, &__orig_termios) ? ERR : OK); 262 } 263 264 /* 265 * The following routines, savetty and resetty are completely useless and 266 * are left in only as stubs. If people actually use them they will almost 267 * certainly screw up the state of the world. 268 */ 269 static struct termios savedtty; 270 int 271 savetty() 272 { 273 return (tcgetattr(STDIN_FILENO, &savedtty) ? ERR : OK); 274 } 275 276 int 277 resetty() 278 { 279 return (tcsetattr(STDIN_FILENO, __tcaction ? 280 TCSASOFT | TCSADRAIN : TCSADRAIN, &savedtty) ? ERR : OK); 281 } 282
Indexes created Wed Sep 24 05:09:52 GMT 2025