tty.c revision 1.1.1.3
1 /* 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char sccsid[] = "@(#)tty.c 8.2 (Berkeley) 4/20/95"; 36 #endif /* not lint */ 37 38 /* 39 * Mail -- a mail program 40 * 41 * Generally useful tty stuff. 42 */ 43 44 #include "rcv.h" 45 #include "extern.h" 46 47 static int c_erase; /* Current erase char */ 48 static int c_kill; /* Current kill char */ 49 static jmp_buf rewrite; /* Place to go when continued */ 50 static jmp_buf intjmp; /* Place to go when interrupted */ 51 #ifndef TIOCSTI 52 static int ttyset; /* We must now do erase/kill */ 53 #endif 54 55 /* 56 * Read all relevant header fields. 57 */ 58 59 int 60 grabh(hp, gflags) 61 struct header *hp; 62 int gflags; 63 { 64 struct termios ttybuf; 65 sig_t saveint; 66 #ifndef TIOCSTI 67 sig_t savequit; 68 #else 69 int extproc, flag; 70 #endif 71 sig_t savetstp; 72 sig_t savettou; 73 sig_t savettin; 74 int errs; 75 void ttyint(); 76 77 savetstp = signal(SIGTSTP, SIG_DFL); 78 savettou = signal(SIGTTOU, SIG_DFL); 79 savettin = signal(SIGTTIN, SIG_DFL); 80 errs = 0; 81 #ifndef TIOCSTI 82 ttyset = 0; 83 #endif 84 if (ioctl(fileno(stdin), TIOCGETA, &ttybuf) < 0) { 85 perror("TIOCGETA"); 86 return(-1); 87 } 88 c_erase = ttybuf.c_cc[VERASE]; 89 c_kill = ttybuf.c_cc[VKILL]; 90 #ifndef TIOCSTI 91 ttybuf.c_cc[VERASE] = 0; 92 ttybuf.c_cc[VKILL] = 0; 93 if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) 94 signal(SIGINT, SIG_DFL); 95 if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) 96 signal(SIGQUIT, SIG_DFL); 97 #else 98 # ifdef TIOCEXT 99 extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0); 100 if (extproc) { 101 flag = 0; 102 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 103 perror("TIOCEXT: off"); 104 } 105 # endif /* TIOCEXT */ 106 if (setjmp(intjmp)) 107 goto out; 108 saveint = signal(SIGINT, ttyint); 109 #endif 110 if (gflags & GTO) { 111 #ifndef TIOCSTI 112 if (!ttyset && hp->h_to != NIL) 113 ttyset++, tcsetattr(fileno(stdin), &ttybuf); 114 #endif 115 hp->h_to = 116 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 117 } 118 if (gflags & GSUBJECT) { 119 #ifndef TIOCSTI 120 if (!ttyset && hp->h_subject != NOSTR) 121 ttyset++, tcsetattr(fileno(stdin), &ttybuf); 122 #endif 123 hp->h_subject = readtty("Subject: ", hp->h_subject); 124 } 125 if (gflags & GCC) { 126 #ifndef TIOCSTI 127 if (!ttyset && hp->h_cc != NIL) 128 ttyset++, tcsetattr(fileno(stdin), &ttybuf); 129 #endif 130 hp->h_cc = 131 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 132 } 133 if (gflags & GBCC) { 134 #ifndef TIOCSTI 135 if (!ttyset && hp->h_bcc != NIL) 136 ttyset++, tcsetattr(fileno(stdin), &ttybuf); 137 #endif 138 hp->h_bcc = 139 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 140 } 141 out: 142 signal(SIGTSTP, savetstp); 143 signal(SIGTTOU, savettou); 144 signal(SIGTTIN, savettin); 145 #ifndef TIOCSTI 146 ttybuf.c_cc[VERASE] = c_erase; 147 ttybuf.c_cc[VKILL] = c_kill; 148 if (ttyset) 149 tcsetattr(fileno(stdin), &ttybuf); 150 signal(SIGQUIT, savequit); 151 #else 152 # ifdef TIOCEXT 153 if (extproc) { 154 flag = 1; 155 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 156 perror("TIOCEXT: on"); 157 } 158 # endif /* TIOCEXT */ 159 #endif 160 signal(SIGINT, saveint); 161 return(errs); 162 } 163 164 /* 165 * Read up a header from standard input. 166 * The source string has the preliminary contents to 167 * be read. 168 * 169 */ 170 171 char * 172 readtty(pr, src) 173 char pr[], src[]; 174 { 175 char ch, canonb[BUFSIZ]; 176 int c; 177 register char *cp, *cp2; 178 void ttystop(); 179 180 fputs(pr, stdout); 181 fflush(stdout); 182 if (src != NOSTR && strlen(src) > BUFSIZ - 2) { 183 printf("too long to edit\n"); 184 return(src); 185 } 186 #ifndef TIOCSTI 187 if (src != NOSTR) 188 cp = copy(src, canonb); 189 else 190 cp = copy("", canonb); 191 fputs(canonb, stdout); 192 fflush(stdout); 193 #else 194 cp = src == NOSTR ? "" : src; 195 while (c = *cp++) { 196 if (c == c_erase || c == c_kill) { 197 ch = '\\'; 198 ioctl(0, TIOCSTI, &ch); 199 } 200 ch = c; 201 ioctl(0, TIOCSTI, &ch); 202 } 203 cp = canonb; 204 *cp = 0; 205 #endif 206 cp2 = cp; 207 while (cp2 < canonb + BUFSIZ) 208 *cp2++ = 0; 209 cp2 = cp; 210 if (setjmp(rewrite)) 211 goto redo; 212 signal(SIGTSTP, ttystop); 213 signal(SIGTTOU, ttystop); 214 signal(SIGTTIN, ttystop); 215 clearerr(stdin); 216 while (cp2 < canonb + BUFSIZ) { 217 c = getc(stdin); 218 if (c == EOF || c == '\n') 219 break; 220 *cp2++ = c; 221 } 222 *cp2 = 0; 223 signal(SIGTSTP, SIG_DFL); 224 signal(SIGTTOU, SIG_DFL); 225 signal(SIGTTIN, SIG_DFL); 226 if (c == EOF && ferror(stdin)) { 227 redo: 228 cp = strlen(canonb) > 0 ? canonb : NOSTR; 229 clearerr(stdin); 230 return(readtty(pr, cp)); 231 } 232 #ifndef TIOCSTI 233 if (cp == NOSTR || *cp == '\0') 234 return(src); 235 cp2 = cp; 236 if (!ttyset) 237 return(strlen(canonb) > 0 ? savestr(canonb) : NOSTR); 238 while (*cp != '\0') { 239 c = *cp++; 240 if (c == c_erase) { 241 if (cp2 == canonb) 242 continue; 243 if (cp2[-1] == '\\') { 244 cp2[-1] = c; 245 continue; 246 } 247 cp2--; 248 continue; 249 } 250 if (c == c_kill) { 251 if (cp2 == canonb) 252 continue; 253 if (cp2[-1] == '\\') { 254 cp2[-1] = c; 255 continue; 256 } 257 cp2 = canonb; 258 continue; 259 } 260 *cp2++ = c; 261 } 262 *cp2 = '\0'; 263 #endif 264 if (equal("", canonb)) 265 return(NOSTR); 266 return(savestr(canonb)); 267 } 268 269 /* 270 * Receipt continuation. 271 */ 272 void 273 ttystop(s) 274 int s; 275 { 276 sig_t old_action = signal(s, SIG_DFL); 277 278 sigsetmask(sigblock(0) & ~sigmask(s)); 279 kill(0, s); 280 sigblock(sigmask(s)); 281 signal(s, old_action); 282 longjmp(rewrite, 1); 283 } 284 285 /*ARGSUSED*/ 286 void 287 ttyint(s) 288 int s; 289 { 290 longjmp(intjmp, 1); 291 } 292
Indexes created Sun Oct 12 09:09:55 GMT 2025