tty.c revision 1.10
1 /* $NetBSD: tty.c,v 1.10 1998/12/19 16:35:10 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)tty.c 8.2 (Berkeley) 6/6/93"; 40 #else 41 __RCSID("$NetBSD: tty.c,v 1.10 1998/12/19 16:35:10 christos Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 /* 46 * Mail -- a mail program 47 * 48 * Generally useful tty stuff. 49 */ 50 51 #include "rcv.h" 52 #include "extern.h" 53 54 static cc_t c_erase; /* Current erase char */ 55 static cc_t c_kill; /* Current kill char */ 56 static jmp_buf rewrite; /* Place to go when continued */ 57 static jmp_buf intjmp; /* Place to go when interrupted */ 58 #ifndef TIOCSTI 59 static int ttyset; /* We must now do erase/kill */ 60 #endif 61 62 /* 63 * Read all relevant header fields. 64 */ 65 66 int 67 grabh(hp, gflags) 68 struct header *hp; 69 int gflags; 70 { 71 struct termios ttybuf; 72 sig_t saveint; 73 sig_t savetstp; 74 sig_t savettou; 75 sig_t savettin; 76 int errs; 77 #ifndef TIOCSTI 78 sig_t savequit; 79 #else 80 # ifdef TIOCEXT 81 int extproc, flag; 82 # endif /* TIOCEXT */ 83 #endif /* TIOCSTI */ 84 85 #ifdef __GNUC__ 86 /* Avoid longjmp clobbering */ 87 # if !defined(TIOCSTI) && defined(TIOCEXT) 88 (void) &extproc; 89 # endif 90 (void) &saveint; 91 #endif /* __GNUC__ */ 92 93 savetstp = signal(SIGTSTP, SIG_DFL); 94 savettou = signal(SIGTTOU, SIG_DFL); 95 savettin = signal(SIGTTIN, SIG_DFL); 96 errs = 0; 97 #ifndef TIOCSTI 98 ttyset = 0; 99 #endif 100 if (tcgetattr(fileno(stdin), &ttybuf) < 0) { 101 perror("tcgetattr"); 102 return(-1); 103 } 104 c_erase = ttybuf.c_cc[VERASE]; 105 c_kill = ttybuf.c_cc[VKILL]; 106 #ifndef TIOCSTI 107 ttybuf.c_cc[VERASE] = _POSIX_VDISABLE; 108 ttybuf.c_cc[VKILL] = _POSIX_VDISABLE; 109 if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) 110 signal(SIGINT, SIG_DFL); 111 if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) 112 signal(SIGQUIT, SIG_DFL); 113 #else 114 # ifdef TIOCEXT 115 extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0); 116 if (extproc) { 117 flag = 0; 118 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 119 perror("TIOCEXT: off"); 120 } 121 # endif /* TIOCEXT */ 122 if (setjmp(intjmp)) 123 goto out; 124 saveint = signal(SIGINT, ttyint); 125 #endif 126 if (gflags & GTO) { 127 #ifndef TIOCSTI 128 if (!ttyset && hp->h_to != NIL) 129 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 130 #endif 131 hp->h_to = 132 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 133 } 134 if (gflags & GSUBJECT) { 135 #ifndef TIOCSTI 136 if (!ttyset && hp->h_subject != NOSTR) 137 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 138 #endif 139 hp->h_subject = readtty("Subject: ", hp->h_subject); 140 } 141 if (gflags & GCC) { 142 #ifndef TIOCSTI 143 if (!ttyset && hp->h_cc != NIL) 144 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 145 #endif 146 hp->h_cc = 147 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 148 } 149 if (gflags & GBCC) { 150 #ifndef TIOCSTI 151 if (!ttyset && hp->h_bcc != NIL) 152 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 153 #endif 154 hp->h_bcc = 155 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 156 } 157 out: 158 signal(SIGTSTP, savetstp); 159 signal(SIGTTOU, savettou); 160 signal(SIGTTIN, savettin); 161 #ifndef TIOCSTI 162 ttybuf.c_cc[VERASE] = c_erase; 163 ttybuf.c_cc[VKILL] = c_kill; 164 if (ttyset) 165 tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 166 signal(SIGQUIT, savequit); 167 #else 168 # ifdef TIOCEXT 169 if (extproc) { 170 flag = 1; 171 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 172 perror("TIOCEXT: on"); 173 } 174 # endif /* TIOCEXT */ 175 #endif 176 signal(SIGINT, saveint); 177 return(errs); 178 } 179 180 /* 181 * Read up a header from standard input. 182 * The source string has the preliminary contents to 183 * be read. 184 * 185 */ 186 187 char * 188 readtty(pr, src) 189 char pr[], src[]; 190 { 191 char ch, canonb[BUFSIZ]; 192 int c; 193 char *cp, *cp2; 194 #if __GNUC__ 195 /* Avoid longjmp clobbering */ 196 (void) &c; 197 (void) &cp2; 198 #endif 199 200 fputs(pr, stdout); 201 fflush(stdout); 202 if (src != NOSTR && strlen(src) > BUFSIZ - 2) { 203 printf("too long to edit\n"); 204 return(src); 205 } 206 #ifndef TIOCSTI 207 if (src != NOSTR) 208 cp = copy(src, canonb); 209 else 210 cp = copy("", canonb); 211 fputs(canonb, stdout); 212 fflush(stdout); 213 #else 214 cp = src == NOSTR ? "" : src; 215 while ((c = *cp++) != '\0') { 216 if ((c_erase != _POSIX_VDISABLE && c == c_erase) || 217 (c_kill != _POSIX_VDISABLE && c == c_kill)) { 218 ch = '\\'; 219 ioctl(0, TIOCSTI, &ch); 220 } 221 ch = c; 222 ioctl(0, TIOCSTI, &ch); 223 } 224 cp = canonb; 225 *cp = 0; 226 #endif 227 cp2 = cp; 228 while (cp2 < canonb + BUFSIZ) 229 *cp2++ = 0; 230 cp2 = cp; 231 if (setjmp(rewrite)) 232 goto redo; 233 signal(SIGTSTP, ttystop); 234 signal(SIGTTOU, ttystop); 235 signal(SIGTTIN, ttystop); 236 clearerr(stdin); 237 while (cp2 < canonb + BUFSIZ) { 238 c = getc(stdin); 239 if (c == EOF || c == '\n') 240 break; 241 *cp2++ = c; 242 } 243 *cp2 = 0; 244 signal(SIGTSTP, SIG_DFL); 245 signal(SIGTTOU, SIG_DFL); 246 signal(SIGTTIN, SIG_DFL); 247 if (c == EOF && ferror(stdin)) { 248 redo: 249 cp = strlen(canonb) > 0 ? canonb : NOSTR; 250 clearerr(stdin); 251 return(readtty(pr, cp)); 252 } 253 #ifndef TIOCSTI 254 if (cp == NOSTR || *cp == '\0') 255 return(src); 256 cp2 = cp; 257 if (!ttyset) 258 return(strlen(canonb) > 0 ? savestr(canonb) : NOSTR); 259 while (*cp != '\0') { 260 c = *cp++; 261 if (c_erase != _POSIX_VDISABLE && c == c_erase) { 262 if (cp2 == canonb) 263 continue; 264 if (cp2[-1] == '\\') { 265 cp2[-1] = c; 266 continue; 267 } 268 cp2--; 269 continue; 270 } 271 if (c_kill != _POSIX_VDISABLE && c == c_kill) { 272 if (cp2 == canonb) 273 continue; 274 if (cp2[-1] == '\\') { 275 cp2[-1] = c; 276 continue; 277 } 278 cp2 = canonb; 279 continue; 280 } 281 *cp2++ = c; 282 } 283 *cp2 = '\0'; 284 #endif 285 if (equal("", canonb)) 286 return(NOSTR); 287 return(savestr(canonb)); 288 } 289 290 /* 291 * Receipt continuation. 292 */ 293 void 294 ttystop(s) 295 int s; 296 { 297 sig_t old_action = signal(s, SIG_DFL); 298 sigset_t nset; 299 300 sigemptyset(&nset); 301 sigaddset(&nset, s); 302 sigprocmask(SIG_BLOCK, &nset, NULL); 303 kill(0, s); 304 sigprocmask(SIG_UNBLOCK, &nset, NULL); 305 signal(s, old_action); 306 longjmp(rewrite, 1); 307 } 308 309 /*ARGSUSED*/ 310 void 311 ttyint(s) 312 int s; 313 { 314 longjmp(intjmp, 1); 315 } 316
Indexes created Thu Sep 25 08:09:54 GMT 2025