tty.c revision 1.21
1 /* $NetBSD: tty.c,v 1.21 2006/09/18 19:46:21 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 1.21 2006/09/18 19:46:21 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 sig_t saveint; 70 sig_t savetstp; 71 sig_t savettou; 72 sig_t savettin; 73 int errs; 74 #ifndef TIOCSTI 75 sig_t savequit; 76 #else 77 # ifdef TIOCEXT 78 int extproc, flag; 79 # endif /* TIOCEXT */ 80 #endif /* TIOCSTI */ 81 82 #ifdef __GNUC__ 83 /* Avoid longjmp clobbering */ 84 # if defined(TIOCSTI) && defined(TIOCEXT) 85 (void)&extproc; 86 # endif 87 (void)&saveint; 88 saveint = 0; /* XXX gcc */ 89 #endif /* __GNUC__ */ 90 91 savetstp = signal(SIGTSTP, SIG_DFL); 92 savettou = signal(SIGTTOU, SIG_DFL); 93 savettin = signal(SIGTTIN, SIG_DFL); 94 errs = 0; 95 #ifndef TIOCSTI 96 ttyset = 0; 97 #endif 98 if (tcgetattr(fileno(stdin), &ttybuf) < 0) { 99 warn("tcgetattr"); 100 return(-1); 101 } 102 c_erase = ttybuf.c_cc[VERASE]; 103 c_kill = ttybuf.c_cc[VKILL]; 104 #ifndef TIOCSTI 105 ttybuf.c_cc[VERASE] = _POSIX_VDISABLE; 106 ttybuf.c_cc[VKILL] = _POSIX_VDISABLE; 107 if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) 108 (void)signal(SIGINT, SIG_DFL); 109 if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) 110 (void)signal(SIGQUIT, SIG_DFL); 111 #else 112 # ifdef TIOCEXT 113 extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0); 114 if (extproc) { 115 flag = 0; 116 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 117 warn("TIOCEXT: off"); 118 } 119 # endif /* TIOCEXT */ 120 if (setjmp(intjmp)) 121 goto out; 122 saveint = signal(SIGINT, ttyint); 123 #endif 124 if (gflags & GTO) { 125 #ifndef TIOCSTI 126 if (!ttyset && hp->h_to != NULL) 127 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 128 #endif 129 hp->h_to = 130 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 131 } 132 if (gflags & GSUBJECT) { 133 #ifndef TIOCSTI 134 if (!ttyset && hp->h_subject != NULL) 135 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 136 #endif 137 hp->h_subject = readtty("Subject: ", hp->h_subject); 138 } 139 if (gflags & GCC) { 140 #ifndef TIOCSTI 141 if (!ttyset && hp->h_cc != NULL) 142 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 143 #endif 144 hp->h_cc = 145 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 146 } 147 if (gflags & GBCC) { 148 #ifndef TIOCSTI 149 if (!ttyset && hp->h_bcc != NULL) 150 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 151 #endif 152 hp->h_bcc = 153 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 154 } 155 if (gflags & GSMOPTS) { 156 char *smopts; 157 char *argv[MAXARGC]; 158 int argc, i; 159 struct name *np, *t; 160 161 #ifndef TIOCSTI 162 if (!ttyset && hp->h_smopts != NULL) 163 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 164 #endif 165 smopts = readtty("Smopts: ", detract(hp->h_smopts, GSMOPTS)); 166 167 /* Parse smopts with getrawlist() rather than expand() 168 * to get a shell-like expansion. 169 */ 170 hp->h_smopts = NULL; 171 if (smopts) { 172 np = NULL; 173 argc = getrawlist(smopts, argv, sizeof(argv)/sizeof(*argv)); 174 for (i = 0 ; i < argc ; i++) { 175 t = nalloc(argv[i], GSMOPTS); 176 if (hp->h_smopts == NULL) 177 hp->h_smopts = t; 178 else 179 np->n_flink = t; 180 t->n_blink = np; 181 np = t; 182 } 183 } 184 } 185 out: 186 (void)signal(SIGTSTP, savetstp); 187 (void)signal(SIGTTOU, savettou); 188 (void)signal(SIGTTIN, savettin); 189 #ifndef TIOCSTI 190 ttybuf.c_cc[VERASE] = c_erase; 191 ttybuf.c_cc[VKILL] = c_kill; 192 if (ttyset) 193 tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 194 (void)signal(SIGQUIT, savequit); 195 #else 196 # ifdef TIOCEXT 197 if (extproc) { 198 flag = 1; 199 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 200 warn("TIOCEXT: on"); 201 } 202 # endif /* TIOCEXT */ 203 #endif 204 (void)signal(SIGINT, saveint); 205 return(errs); 206 } 207 208 /* 209 * Read up a header from standard input. 210 * The source string has the preliminary contents to 211 * be read. 212 * 213 */ 214 215 #ifdef USE_READLINE 216 char * 217 readtty(const char pr[], char src[]) 218 { 219 return savestr(rl_getline(pr, src)); 220 } 221 #else 222 char * 223 readtty(const char pr[], char src[]) 224 { 225 char ch, canonb[BUFSIZ]; 226 int c; 227 char *cp, *cp2; 228 static char empty[] = ""; 229 #if __GNUC__ 230 /* Avoid longjmp clobbering */ 231 (void)&c; 232 (void)&cp2; 233 #endif 234 235 (void)fputs(pr, stdout); 236 (void)fflush(stdout); 237 if (src != NULL && strlen(src) > BUFSIZ - 2) { 238 (void)printf("too long to edit\n"); 239 return(src); 240 } 241 #ifndef TIOCSTI 242 if (src != NULL) 243 cp = copy(src, canonb); 244 else 245 cp = copy("", canonb); 246 (void)fputs(canonb, stdout); 247 (void)fflush(stdout); 248 #else 249 cp = src == NULL ? empty : src; 250 while ((c = *cp++) != '\0') { 251 if ((c_erase != _POSIX_VDISABLE && c == c_erase) || 252 (c_kill != _POSIX_VDISABLE && c == c_kill)) { 253 ch = '\\'; 254 (void)ioctl(0, TIOCSTI, &ch); 255 } 256 ch = c; 257 (void)ioctl(0, TIOCSTI, &ch); 258 } 259 cp = canonb; 260 *cp = 0; 261 #endif 262 cp2 = cp; 263 while (cp2 < canonb + BUFSIZ) 264 *cp2++ = 0; 265 cp2 = cp; 266 if (setjmp(rewrite)) 267 goto redo; 268 (void)signal(SIGTSTP, ttystop); 269 (void)signal(SIGTTOU, ttystop); 270 (void)signal(SIGTTIN, ttystop); 271 clearerr(stdin); 272 while (cp2 < canonb + BUFSIZ) { 273 c = getc(stdin); 274 if (c == EOF || c == '\n') 275 break; 276 *cp2++ = c; 277 } 278 *cp2 = 0; 279 (void)signal(SIGTSTP, SIG_DFL); 280 (void)signal(SIGTTOU, SIG_DFL); 281 (void)signal(SIGTTIN, SIG_DFL); 282 if (c == EOF && ferror(stdin)) { 283 redo: 284 cp = strlen(canonb) > 0 ? canonb : NULL; 285 clearerr(stdin); 286 return(readtty(pr, cp)); 287 } 288 #ifndef TIOCSTI 289 if (cp == NULL || *cp == '\0') 290 return(src); 291 cp2 = cp; 292 if (!ttyset) 293 return(strlen(canonb) > 0 ? savestr(canonb) : NULL); 294 while (*cp != '\0') { 295 c = *cp++; 296 if (c_erase != _POSIX_VDISABLE && c == c_erase) { 297 if (cp2 == canonb) 298 continue; 299 if (cp2[-1] == '\\') { 300 cp2[-1] = c; 301 continue; 302 } 303 cp2--; 304 continue; 305 } 306 if (c_kill != _POSIX_VDISABLE && c == c_kill) { 307 if (cp2 == canonb) 308 continue; 309 if (cp2[-1] == '\\') { 310 cp2[-1] = c; 311 continue; 312 } 313 cp2 = canonb; 314 continue; 315 } 316 *cp2++ = c; 317 } 318 *cp2 = '\0'; 319 #endif 320 if (equal("", canonb)) 321 return(NULL); 322 return(savestr(canonb)); 323 } 324 #endif 325 326 /* 327 * Receipt continuation. 328 */ 329 void 330 ttystop(int s) 331 { 332 sig_t old_action = signal(s, SIG_DFL); 333 sigset_t nset; 334 335 (void)sigemptyset(&nset); 336 (void)sigaddset(&nset, s); 337 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 338 (void)kill(0, s); 339 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 340 (void)signal(s, old_action); 341 longjmp(rewrite, 1); 342 } 343 344 /*ARGSUSED*/ 345 void 346 ttyint(int s) 347 { 348 longjmp(intjmp, 1); 349 } 350
Indexes created Sat Sep 27 14:09:57 GMT 2025