1 /* $NetBSD: tty.c,v 1.6 1996/12/28 07:11:08 tls 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 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)tty.c 8.2 (Berkeley) 6/6/93"; 39 #else 40 static char rcsid[] = "$NetBSD: tty.c,v 1.6 1996/12/28 07:11:08 tls Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 /* 45 * Mail -- a mail program 46 * 47 * Generally useful tty stuff. 48 */ 49 50 #include "rcv.h" 51 #include "extern.h" 52 #include <sys/ioctl.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 #ifndef TIOCSTI 74 sig_t savequit; 75 #else 76 int extproc, flag; 77 #endif 78 sig_t savetstp; 79 sig_t savettou; 80 sig_t savettin; 81 int errs; 82 #ifdef __GNUC__ 83 /* Avoid longjmp clobbering */ 84 (void) &saveint; 85 #endif 86 87 savetstp = signal(SIGTSTP, SIG_DFL); 88 savettou = signal(SIGTTOU, SIG_DFL); 89 savettin = signal(SIGTTIN, SIG_DFL); 90 errs = 0; 91 #ifndef TIOCSTI 92 ttyset = 0; 93 #endif 94 if (tcgetattr(fileno(stdin), &ttybuf) < 0) { 95 perror("tcgetattr"); 96 return(-1); 97 } 98 c_erase = ttybuf.c_cc[VERASE]; 99 c_kill = ttybuf.c_cc[VKILL]; 100 #ifndef TIOCSTI 101 ttybuf.c_cc[VERASE] = 0; 102 ttybuf.c_cc[VKILL] = 0; 103 if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) 104 signal(SIGINT, SIG_DFL); 105 if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) 106 signal(SIGQUIT, SIG_DFL); 107 #else 108 # ifdef TIOCEXT 109 extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0); 110 if (extproc) { 111 flag = 0; 112 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 113 perror("TIOCEXT: off"); 114 } 115 # endif /* TIOCEXT */ 116 if (setjmp(intjmp)) 117 goto out; 118 saveint = signal(SIGINT, ttyint); 119 #endif 120 if (gflags & GTO) { 121 #ifndef TIOCSTI 122 if (!ttyset && hp->h_to != NIL) 123 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 124 #endif 125 hp->h_to = 126 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 127 } 128 if (gflags & GSUBJECT) { 129 #ifndef TIOCSTI 130 if (!ttyset && hp->h_subject != NOSTR) 131 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 132 #endif 133 hp->h_subject = readtty("Subject: ", hp->h_subject); 134 } 135 if (gflags & GCC) { 136 #ifndef TIOCSTI 137 if (!ttyset && hp->h_cc != NIL) 138 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 139 #endif 140 hp->h_cc = 141 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 142 } 143 if (gflags & GBCC) { 144 #ifndef TIOCSTI 145 if (!ttyset && hp->h_bcc != NIL) 146 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 147 #endif 148 hp->h_bcc = 149 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 150 } 151 out: 152 signal(SIGTSTP, savetstp); 153 signal(SIGTTOU, savettou); 154 signal(SIGTTIN, savettin); 155 #ifndef TIOCSTI 156 ttybuf.c_cc[VERASE] = c_erase; 157 ttybuf.c_cc[VKILL] = c_kill; 158 if (ttyset) 159 tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 160 signal(SIGQUIT, savequit); 161 #else 162 # ifdef TIOCEXT 163 if (extproc) { 164 flag = 1; 165 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 166 perror("TIOCEXT: on"); 167 } 168 # endif /* TIOCEXT */ 169 #endif 170 signal(SIGINT, saveint); 171 return(errs); 172 } 173 174 /* 175 * Read up a header from standard input. 176 * The source string has the preliminary contents to 177 * be read. 178 * 179 */ 180 181 char * 182 readtty(pr, src) 183 char pr[], src[]; 184 { 185 char ch, canonb[BUFSIZ]; 186 int c; 187 char *cp, *cp2; 188 #if __GNUC__ 189 /* Avoid longjmp clobbering */ 190 (void) &c; 191 (void) &cp2; 192 #endif 193 194 fputs(pr, stdout); 195 fflush(stdout); 196 if (src != NOSTR && strlen(src) > BUFSIZ - 2) { 197 printf("too long to edit\n"); 198 return(src); 199 } 200 #ifndef TIOCSTI 201 if (src != NOSTR) 202 cp = copy(src, canonb); 203 else 204 cp = copy("", canonb); 205 fputs(canonb, stdout); 206 fflush(stdout); 207 #else 208 cp = src == NOSTR ? "" : src; 209 while ((c = *cp++) != '\0') { 210 if ((c_erase != _POSIX_VDISABLE && c == c_erase) || 211 (c_kill != _POSIX_VDISABLE && c == c_kill)) { 212 ch = '\\'; 213 ioctl(0, TIOCSTI, &ch); 214 } 215 ch = c; 216 ioctl(0, TIOCSTI, &ch); 217 } 218 cp = canonb; 219 *cp = 0; 220 #endif 221 cp2 = cp; 222 while (cp2 < canonb + BUFSIZ) 223 *cp2++ = 0; 224 cp2 = cp; 225 if (setjmp(rewrite)) 226 goto redo; 227 signal(SIGTSTP, ttystop); 228 signal(SIGTTOU, ttystop); 229 signal(SIGTTIN, ttystop); 230 clearerr(stdin); 231 while (cp2 < canonb + BUFSIZ) { 232 c = getc(stdin); 233 if (c == EOF || c == '\n') 234 break; 235 *cp2++ = c; 236 } 237 *cp2 = 0; 238 signal(SIGTSTP, SIG_DFL); 239 signal(SIGTTOU, SIG_DFL); 240 signal(SIGTTIN, SIG_DFL); 241 if (c == EOF && ferror(stdin)) { 242 redo: 243 cp = strlen(canonb) > 0 ? canonb : NOSTR; 244 clearerr(stdin); 245 return(readtty(pr, cp)); 246 } 247 #ifndef TIOCSTI 248 if (cp == NOSTR || *cp == '\0') 249 return(src); 250 cp2 = cp; 251 if (!ttyset) 252 return(strlen(canonb) > 0 ? savestr(canonb) : NOSTR); 253 while (*cp != '\0') { 254 c = *cp++; 255 if (c_erase != _POSIX_VDISABLE && c == c_erase) { 256 if (cp2 == canonb) 257 continue; 258 if (cp2[-1] == '\\') { 259 cp2[-1] = c; 260 continue; 261 } 262 cp2--; 263 continue; 264 } 265 if (c_kill != _POSIX_VDISABLE && c == c_kill) { 266 if (cp2 == canonb) 267 continue; 268 if (cp2[-1] == '\\') { 269 cp2[-1] = c; 270 continue; 271 } 272 cp2 = canonb; 273 continue; 274 } 275 *cp2++ = c; 276 } 277 *cp2 = '\0'; 278 #endif 279 if (equal("", canonb)) 280 return(NOSTR); 281 return(savestr(canonb)); 282 } 283 284 /* 285 * Receipt continuation. 286 */ 287 void 288 ttystop(s) 289 int s; 290 { 291 sig_t old_action = signal(s, SIG_DFL); 292 sigset_t nset; 293 294 sigemptyset(&nset); 295 sigaddset(&nset, s); 296 sigprocmask(SIG_BLOCK, &nset, NULL); 297 kill(0, s); 298 sigprocmask(SIG_UNBLOCK, &nset, NULL); 299 signal(s, old_action); 300 longjmp(rewrite, 1); 301 } 302 303 /*ARGSUSED*/ 304 void 305 ttyint(s) 306 int s; 307 { 308 longjmp(intjmp, 1); 309 } 310