tty.c revision 1.23
1 /* $NetBSD: tty.c,v 1.23 2006/09/27 12:58:33 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)tty.c 8.2 (Berkeley) 6/6/93"; 36 #else 37 __RCSID("$NetBSD: tty.c,v 1.23 2006/09/27 12:58:33 christos Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 /* 42 * Mail -- a mail program 43 * 44 * Generally useful tty stuff. 45 */ 46 47 #include "rcv.h" 48 #include "extern.h" 49 #ifdef USE_READLINE 50 #include "complete.h" 51 #endif 52 53 static cc_t c_erase; /* Current erase char */ 54 static cc_t c_kill; /* Current kill char */ 55 static jmp_buf rewrite; /* Place to go when continued */ 56 static jmp_buf intjmp; /* Place to go when interrupted */ 57 #ifndef TIOCSTI 58 static int ttyset; /* We must now do erase/kill */ 59 #endif 60 61 /* 62 * Read all relevant header fields. 63 */ 64 65 int 66 grabh(struct header *hp, int gflags) 67 { 68 struct termios ttybuf; 69 static sig_t saveint; 70 static sig_t savetstp; 71 static sig_t savettou; 72 static sig_t savettin; 73 int errs; 74 #ifndef TIOCSTI 75 static sig_t savequit; 76 #else 77 # ifdef TIOCEXT 78 static int extproc; 79 int flag; 80 # endif /* TIOCEXT */ 81 #endif /* TIOCSTI */ 82 83 savetstp = signal(SIGTSTP, SIG_DFL); 84 savettou = signal(SIGTTOU, SIG_DFL); 85 savettin = signal(SIGTTIN, SIG_DFL); 86 errs = 0; 87 #ifndef TIOCSTI 88 ttyset = 0; 89 #endif 90 if (tcgetattr(fileno(stdin), &ttybuf) < 0) { 91 warn("tcgetattr"); 92 return(-1); 93 } 94 c_erase = ttybuf.c_cc[VERASE]; 95 c_kill = ttybuf.c_cc[VKILL]; 96 #ifndef TIOCSTI 97 ttybuf.c_cc[VERASE] = _POSIX_VDISABLE; 98 ttybuf.c_cc[VKILL] = _POSIX_VDISABLE; 99 if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) 100 (void)signal(SIGINT, SIG_DFL); 101 if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) 102 (void)signal(SIGQUIT, SIG_DFL); 103 #else 104 # ifdef TIOCEXT 105 extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0); 106 if (extproc) { 107 flag = 0; 108 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 109 warn("TIOCEXT: off"); 110 } 111 # endif /* TIOCEXT */ 112 if (setjmp(intjmp)) { 113 #ifdef USE_READLINE 114 (void)fputc('\n',stdout); 115 errs = 1; 116 #endif /* USE_READLINE */ 117 goto out; 118 } 119 saveint = signal(SIGINT, ttyint); 120 #endif 121 if (gflags & GTO) { 122 #ifndef TIOCSTI 123 if (!ttyset && hp->h_to != NULL) 124 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 125 #endif 126 hp->h_to = 127 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 128 } 129 if (gflags & GSUBJECT) { 130 #ifndef TIOCSTI 131 if (!ttyset && hp->h_subject != NULL) 132 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 133 #endif 134 hp->h_subject = readtty("Subject: ", hp->h_subject); 135 } 136 if (gflags & GCC) { 137 #ifndef TIOCSTI 138 if (!ttyset && hp->h_cc != NULL) 139 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 140 #endif 141 hp->h_cc = 142 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 143 } 144 if (gflags & GBCC) { 145 #ifndef TIOCSTI 146 if (!ttyset && hp->h_bcc != NULL) 147 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 148 #endif 149 hp->h_bcc = 150 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 151 } 152 if (gflags & GSMOPTS) { 153 char *smopts; 154 char *argv[MAXARGC]; 155 int argc, i; 156 struct name *np, *t; 157 158 #ifndef TIOCSTI 159 if (!ttyset && hp->h_smopts != NULL) 160 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 161 #endif 162 smopts = readtty("Smopts: ", detract(hp->h_smopts, GSMOPTS)); 163 164 /* Parse smopts with getrawlist() rather than expand() 165 * to get a shell-like expansion. 166 */ 167 hp->h_smopts = NULL; 168 if (smopts) { 169 np = NULL; 170 argc = getrawlist(smopts, argv, sizeof(argv)/sizeof(*argv)); 171 for (i = 0 ; i < argc ; i++) { 172 t = nalloc(argv[i], GSMOPTS); 173 if (hp->h_smopts == NULL) 174 hp->h_smopts = t; 175 else 176 np->n_flink = t; 177 t->n_blink = np; 178 np = t; 179 } 180 } 181 } 182 out: 183 (void)signal(SIGTSTP, savetstp); 184 (void)signal(SIGTTOU, savettou); 185 (void)signal(SIGTTIN, savettin); 186 #ifndef TIOCSTI 187 ttybuf.c_cc[VERASE] = c_erase; 188 ttybuf.c_cc[VKILL] = c_kill; 189 if (ttyset) 190 tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 191 (void)signal(SIGQUIT, savequit); 192 #else 193 # ifdef TIOCEXT 194 if (extproc) { 195 flag = 1; 196 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 197 warn("TIOCEXT: on"); 198 } 199 # endif /* TIOCEXT */ 200 #endif 201 (void)signal(SIGINT, saveint); 202 return(errs); 203 } 204 205 /* 206 * Read up a header from standard input. 207 * The source string has the preliminary contents to 208 * be read. 209 * 210 */ 211 212 #ifdef USE_READLINE 213 char * 214 readtty(const char pr[], char src[]) 215 { 216 return savestr(rl_getline(pr, src)); 217 } 218 #else 219 char * 220 readtty(const char pr[], char src[]) 221 { 222 char ch, canonb[BUFSIZ]; 223 int c; 224 char *cp, *cp2; 225 static char empty[] = ""; 226 #if __GNUC__ 227 /* Avoid longjmp clobbering */ 228 (void)&c; 229 (void)&cp2; 230 #endif 231 232 (void)fputs(pr, stdout); 233 (void)fflush(stdout); 234 if (src != NULL && strlen(src) > BUFSIZ - 2) { 235 (void)printf("too long to edit\n"); 236 return(src); 237 } 238 #ifndef TIOCSTI 239 if (src != NULL) 240 cp = copy(src, canonb); 241 else 242 cp = copy("", canonb); 243 (void)fputs(canonb, stdout); 244 (void)fflush(stdout); 245 #else 246 cp = src == NULL ? empty : src; 247 while ((c = *cp++) != '\0') { 248 if ((c_erase != _POSIX_VDISABLE && c == c_erase) || 249 (c_kill != _POSIX_VDISABLE && c == c_kill)) { 250 ch = '\\'; 251 (void)ioctl(0, TIOCSTI, &ch); 252 } 253 ch = c; 254 (void)ioctl(0, TIOCSTI, &ch); 255 } 256 cp = canonb; 257 *cp = 0; 258 #endif 259 cp2 = cp; 260 while (cp2 < canonb + BUFSIZ) 261 *cp2++ = 0; 262 cp2 = cp; 263 if (setjmp(rewrite)) 264 goto redo; 265 (void)signal(SIGTSTP, ttystop); 266 (void)signal(SIGTTOU, ttystop); 267 (void)signal(SIGTTIN, ttystop); 268 clearerr(stdin); 269 while (cp2 < canonb + BUFSIZ) { 270 c = getc(stdin); 271 if (c == EOF || c == '\n') 272 break; 273 *cp2++ = c; 274 } 275 *cp2 = 0; 276 (void)signal(SIGTSTP, SIG_DFL); 277 (void)signal(SIGTTOU, SIG_DFL); 278 (void)signal(SIGTTIN, SIG_DFL); 279 if (c == EOF && ferror(stdin)) { 280 redo: 281 cp = strlen(canonb) > 0 ? canonb : NULL; 282 clearerr(stdin); 283 return(readtty(pr, cp)); 284 } 285 #ifndef TIOCSTI 286 if (cp == NULL || *cp == '\0') 287 return(src); 288 cp2 = cp; 289 if (!ttyset) 290 return(strlen(canonb) > 0 ? savestr(canonb) : NULL); 291 while (*cp != '\0') { 292 c = *cp++; 293 if (c_erase != _POSIX_VDISABLE && c == c_erase) { 294 if (cp2 == canonb) 295 continue; 296 if (cp2[-1] == '\\') { 297 cp2[-1] = c; 298 continue; 299 } 300 cp2--; 301 continue; 302 } 303 if (c_kill != _POSIX_VDISABLE && c == c_kill) { 304 if (cp2 == canonb) 305 continue; 306 if (cp2[-1] == '\\') { 307 cp2[-1] = c; 308 continue; 309 } 310 cp2 = canonb; 311 continue; 312 } 313 *cp2++ = c; 314 } 315 *cp2 = '\0'; 316 #endif 317 if (equal("", canonb)) 318 return(NULL); 319 return(savestr(canonb)); 320 } 321 #endif 322 323 /* 324 * Receipt continuation. 325 */ 326 void 327 ttystop(int s) 328 { 329 sig_t old_action = signal(s, SIG_DFL); 330 sigset_t nset; 331 332 (void)sigemptyset(&nset); 333 (void)sigaddset(&nset, s); 334 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 335 (void)kill(0, s); 336 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 337 (void)signal(s, old_action); 338 longjmp(rewrite, 1); 339 } 340 341 /*ARGSUSED*/ 342 void 343 ttyint(int s) 344 { 345 longjmp(intjmp, 1); 346 } 347
Indexes created Sun Oct 12 22:09:51 GMT 2025