tty.c revision 1.22
1 /* $NetBSD: tty.c,v 1.22 2006/09/26 23:33:23 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 1.22 2006/09/26 23:33:23 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 #ifdef USE_READLINE 122 (void)printf("\n(continue)\n"); 123 #endif /* USE_READLINE */ 124 goto out; 125 } 126 saveint = signal(SIGINT, ttyint); 127 #endif 128 if (gflags & GTO) { 129 #ifndef TIOCSTI 130 if (!ttyset && hp->h_to != NULL) 131 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 132 #endif 133 hp->h_to = 134 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 135 } 136 if (gflags & GSUBJECT) { 137 #ifndef TIOCSTI 138 if (!ttyset && hp->h_subject != NULL) 139 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 140 #endif 141 hp->h_subject = readtty("Subject: ", hp->h_subject); 142 } 143 if (gflags & GCC) { 144 #ifndef TIOCSTI 145 if (!ttyset && hp->h_cc != NULL) 146 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 147 #endif 148 hp->h_cc = 149 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 150 } 151 if (gflags & GBCC) { 152 #ifndef TIOCSTI 153 if (!ttyset && hp->h_bcc != NULL) 154 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 155 #endif 156 hp->h_bcc = 157 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 158 } 159 if (gflags & GSMOPTS) { 160 char *smopts; 161 char *argv[MAXARGC]; 162 int argc, i; 163 struct name *np, *t; 164 165 #ifndef TIOCSTI 166 if (!ttyset && hp->h_smopts != NULL) 167 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 168 #endif 169 smopts = readtty("Smopts: ", detract(hp->h_smopts, GSMOPTS)); 170 171 /* Parse smopts with getrawlist() rather than expand() 172 * to get a shell-like expansion. 173 */ 174 hp->h_smopts = NULL; 175 if (smopts) { 176 np = NULL; 177 argc = getrawlist(smopts, argv, sizeof(argv)/sizeof(*argv)); 178 for (i = 0 ; i < argc ; i++) { 179 t = nalloc(argv[i], GSMOPTS); 180 if (hp->h_smopts == NULL) 181 hp->h_smopts = t; 182 else 183 np->n_flink = t; 184 t->n_blink = np; 185 np = t; 186 } 187 } 188 } 189 out: 190 (void)signal(SIGTSTP, savetstp); 191 (void)signal(SIGTTOU, savettou); 192 (void)signal(SIGTTIN, savettin); 193 #ifndef TIOCSTI 194 ttybuf.c_cc[VERASE] = c_erase; 195 ttybuf.c_cc[VKILL] = c_kill; 196 if (ttyset) 197 tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 198 (void)signal(SIGQUIT, savequit); 199 #else 200 # ifdef TIOCEXT 201 if (extproc) { 202 flag = 1; 203 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 204 warn("TIOCEXT: on"); 205 } 206 # endif /* TIOCEXT */ 207 #endif 208 (void)signal(SIGINT, saveint); 209 return(errs); 210 } 211 212 /* 213 * Read up a header from standard input. 214 * The source string has the preliminary contents to 215 * be read. 216 * 217 */ 218 219 #ifdef USE_READLINE 220 char * 221 readtty(const char pr[], char src[]) 222 { 223 return savestr(rl_getline(pr, src)); 224 } 225 #else 226 char * 227 readtty(const char pr[], char src[]) 228 { 229 char ch, canonb[BUFSIZ]; 230 int c; 231 char *cp, *cp2; 232 static char empty[] = ""; 233 #if __GNUC__ 234 /* Avoid longjmp clobbering */ 235 (void)&c; 236 (void)&cp2; 237 #endif 238 239 (void)fputs(pr, stdout); 240 (void)fflush(stdout); 241 if (src != NULL && strlen(src) > BUFSIZ - 2) { 242 (void)printf("too long to edit\n"); 243 return(src); 244 } 245 #ifndef TIOCSTI 246 if (src != NULL) 247 cp = copy(src, canonb); 248 else 249 cp = copy("", canonb); 250 (void)fputs(canonb, stdout); 251 (void)fflush(stdout); 252 #else 253 cp = src == NULL ? empty : src; 254 while ((c = *cp++) != '\0') { 255 if ((c_erase != _POSIX_VDISABLE && c == c_erase) || 256 (c_kill != _POSIX_VDISABLE && c == c_kill)) { 257 ch = '\\'; 258 (void)ioctl(0, TIOCSTI, &ch); 259 } 260 ch = c; 261 (void)ioctl(0, TIOCSTI, &ch); 262 } 263 cp = canonb; 264 *cp = 0; 265 #endif 266 cp2 = cp; 267 while (cp2 < canonb + BUFSIZ) 268 *cp2++ = 0; 269 cp2 = cp; 270 if (setjmp(rewrite)) 271 goto redo; 272 (void)signal(SIGTSTP, ttystop); 273 (void)signal(SIGTTOU, ttystop); 274 (void)signal(SIGTTIN, ttystop); 275 clearerr(stdin); 276 while (cp2 < canonb + BUFSIZ) { 277 c = getc(stdin); 278 if (c == EOF || c == '\n') 279 break; 280 *cp2++ = c; 281 } 282 *cp2 = 0; 283 (void)signal(SIGTSTP, SIG_DFL); 284 (void)signal(SIGTTOU, SIG_DFL); 285 (void)signal(SIGTTIN, SIG_DFL); 286 if (c == EOF && ferror(stdin)) { 287 redo: 288 cp = strlen(canonb) > 0 ? canonb : NULL; 289 clearerr(stdin); 290 return(readtty(pr, cp)); 291 } 292 #ifndef TIOCSTI 293 if (cp == NULL || *cp == '\0') 294 return(src); 295 cp2 = cp; 296 if (!ttyset) 297 return(strlen(canonb) > 0 ? savestr(canonb) : NULL); 298 while (*cp != '\0') { 299 c = *cp++; 300 if (c_erase != _POSIX_VDISABLE && c == c_erase) { 301 if (cp2 == canonb) 302 continue; 303 if (cp2[-1] == '\\') { 304 cp2[-1] = c; 305 continue; 306 } 307 cp2--; 308 continue; 309 } 310 if (c_kill != _POSIX_VDISABLE && c == c_kill) { 311 if (cp2 == canonb) 312 continue; 313 if (cp2[-1] == '\\') { 314 cp2[-1] = c; 315 continue; 316 } 317 cp2 = canonb; 318 continue; 319 } 320 *cp2++ = c; 321 } 322 *cp2 = '\0'; 323 #endif 324 if (equal("", canonb)) 325 return(NULL); 326 return(savestr(canonb)); 327 } 328 #endif 329 330 /* 331 * Receipt continuation. 332 */ 333 void 334 ttystop(int s) 335 { 336 sig_t old_action = signal(s, SIG_DFL); 337 sigset_t nset; 338 339 (void)sigemptyset(&nset); 340 (void)sigaddset(&nset, s); 341 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 342 (void)kill(0, s); 343 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 344 (void)signal(s, old_action); 345 longjmp(rewrite, 1); 346 } 347 348 /*ARGSUSED*/ 349 void 350 ttyint(int s) 351 { 352 longjmp(intjmp, 1); 353 } 354
Indexes created Sat Sep 27 14:09:57 GMT 2025