1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * 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[] = "from: @(#)tty.c 5.12 (Berkeley) 4/1/91";*/ 36 static char rcsid[] = "$Id: tty.c,v 1.2 1993/08/01 18:12:53 mycroft Exp $"; 37 #endif /* not lint */ 38 39 /* 40 * Mail -- a mail program 41 * 42 * Generally useful tty stuff. 43 */ 44 45 #include "rcv.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 grabh(hp, gflags) 60 struct header *hp; 61 { 62 struct sgttyb ttybuf; 63 sig_t saveint; 64 #ifndef TIOCSTI 65 sig_t savequit; 66 #endif 67 sig_t savetstp; 68 sig_t savettou; 69 sig_t savettin; 70 int errs; 71 void ttyint(); 72 73 savetstp = signal(SIGTSTP, SIG_DFL); 74 savettou = signal(SIGTTOU, SIG_DFL); 75 savettin = signal(SIGTTIN, SIG_DFL); 76 errs = 0; 77 #ifndef TIOCSTI 78 ttyset = 0; 79 #endif 80 if (ioctl(fileno(stdin), TIOCGETP, &ttybuf) < 0) { 81 perror("gtty"); 82 return(-1); 83 } 84 c_erase = ttybuf.sg_erase; 85 c_kill = ttybuf.sg_kill; 86 #ifndef TIOCSTI 87 ttybuf.sg_erase = 0; 88 ttybuf.sg_kill = 0; 89 if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) 90 signal(SIGINT, SIG_DFL); 91 if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) 92 signal(SIGQUIT, SIG_DFL); 93 #else 94 if (setjmp(intjmp)) 95 goto out; 96 saveint = signal(SIGINT, ttyint); 97 #endif 98 if (gflags & GTO) { 99 #ifndef TIOCSTI 100 if (!ttyset && hp->h_to != NIL) 101 ttyset++, stty(fileno(stdin), &ttybuf); 102 #endif 103 hp->h_to = 104 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 105 } 106 if (gflags & GSUBJECT) { 107 #ifndef TIOCSTI 108 if (!ttyset && hp->h_subject != NOSTR) 109 ttyset++, stty(fileno(stdin), &ttybuf); 110 #endif 111 hp->h_subject = readtty("Subject: ", hp->h_subject); 112 } 113 if (gflags & GCC) { 114 #ifndef TIOCSTI 115 if (!ttyset && hp->h_cc != NIL) 116 ttyset++, stty(fileno(stdin), &ttybuf); 117 #endif 118 hp->h_cc = 119 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 120 } 121 if (gflags & GBCC) { 122 #ifndef TIOCSTI 123 if (!ttyset && hp->h_bcc != NIL) 124 ttyset++, stty(fileno(stdin), &ttybuf); 125 #endif 126 hp->h_bcc = 127 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 128 } 129 out: 130 signal(SIGTSTP, savetstp); 131 signal(SIGTTOU, savettou); 132 signal(SIGTTIN, savettin); 133 #ifndef TIOCSTI 134 ttybuf.sg_erase = c_erase; 135 ttybuf.sg_kill = c_kill; 136 if (ttyset) 137 stty(fileno(stdin), &ttybuf); 138 signal(SIGQUIT, savequit); 139 #endif 140 signal(SIGINT, saveint); 141 return(errs); 142 } 143 144 /* 145 * Read up a header from standard input. 146 * The source string has the preliminary contents to 147 * be read. 148 * 149 */ 150 151 char * 152 readtty(pr, src) 153 char pr[], src[]; 154 { 155 char ch, canonb[BUFSIZ]; 156 int c; 157 register char *cp, *cp2; 158 void ttystop(); 159 160 fputs(pr, stdout); 161 fflush(stdout); 162 if (src != NOSTR && strlen(src) > BUFSIZ - 2) { 163 printf("too long to edit\n"); 164 return(src); 165 } 166 #ifndef TIOCSTI 167 if (src != NOSTR) 168 cp = copy(src, canonb); 169 else 170 cp = copy("", canonb); 171 fputs(canonb, stdout); 172 fflush(stdout); 173 #else 174 cp = src == NOSTR ? "" : src; 175 while (c = *cp++) { 176 if (c == c_erase || c == c_kill) { 177 ch = '\\'; 178 ioctl(0, TIOCSTI, &ch); 179 } 180 ch = c; 181 ioctl(0, TIOCSTI, &ch); 182 } 183 cp = canonb; 184 *cp = 0; 185 #endif 186 cp2 = cp; 187 while (cp2 < canonb + BUFSIZ) 188 *cp2++ = 0; 189 cp2 = cp; 190 if (setjmp(rewrite)) 191 goto redo; 192 signal(SIGTSTP, ttystop); 193 signal(SIGTTOU, ttystop); 194 signal(SIGTTIN, ttystop); 195 clearerr(stdin); 196 while (cp2 < canonb + BUFSIZ) { 197 c = getc(stdin); 198 if (c == EOF || c == '\n') 199 break; 200 *cp2++ = c; 201 } 202 *cp2 = 0; 203 signal(SIGTSTP, SIG_DFL); 204 signal(SIGTTOU, SIG_DFL); 205 signal(SIGTTIN, SIG_DFL); 206 if (c == EOF && ferror(stdin)) { 207 redo: 208 cp = strlen(canonb) > 0 ? canonb : NOSTR; 209 clearerr(stdin); 210 return(readtty(pr, cp)); 211 } 212 #ifndef TIOCSTI 213 if (cp == NOSTR || *cp == '\0') 214 return(src); 215 cp2 = cp; 216 if (!ttyset) 217 return(strlen(canonb) > 0 ? savestr(canonb) : NOSTR); 218 while (*cp != '\0') { 219 c = *cp++; 220 if (c == c_erase) { 221 if (cp2 == canonb) 222 continue; 223 if (cp2[-1] == '\\') { 224 cp2[-1] = c; 225 continue; 226 } 227 cp2--; 228 continue; 229 } 230 if (c == c_kill) { 231 if (cp2 == canonb) 232 continue; 233 if (cp2[-1] == '\\') { 234 cp2[-1] = c; 235 continue; 236 } 237 cp2 = canonb; 238 continue; 239 } 240 *cp2++ = c; 241 } 242 *cp2 = '\0'; 243 #endif 244 if (equal("", canonb)) 245 return(NOSTR); 246 return(savestr(canonb)); 247 } 248 249 /* 250 * Receipt continuation. 251 */ 252 void 253 ttystop(s) 254 { 255 sig_t old_action = signal(s, SIG_DFL); 256 257 sigsetmask(sigblock(0) & ~sigmask(s)); 258 kill(0, s); 259 sigblock(sigmask(s)); 260 signal(s, old_action); 261 longjmp(rewrite, 1); 262 } 263 264 /*ARGSUSED*/ 265 void 266 ttyint(s) 267 { 268 longjmp(intjmp, 1); 269 } 270