1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 #ifndef lint 33 #if 0 34 static char sccsid[] = "@(#)tty.c 8.2 (Berkeley) 6/6/93"; 35 #endif 36 #endif /* not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 /* 41 * Mail -- a mail program 42 * 43 * Generally useful tty stuff. 44 */ 45 46 #include "rcv.h" 47 #include "extern.h" 48 49 static cc_t c_erase; /* Current erase char */ 50 static cc_t c_kill; /* Current kill char */ 51 static jmp_buf rewrite; /* Place to go when continued */ 52 static jmp_buf intjmp; /* Place to go when interrupted */ 53 #ifndef TIOCSTI 54 static int ttyset; /* We must now do erase/kill */ 55 #endif 56 57 /* 58 * Read all relevant header fields. 59 */ 60 61 int 62 grabh(struct header *hp, int gflags) 63 { 64 struct termios ttybuf; 65 sig_t saveint; 66 sig_t savetstp; 67 sig_t savettou; 68 sig_t savettin; 69 int errs; 70 #ifndef TIOCSTI 71 sig_t savequit; 72 #else 73 # ifdef TIOCEXT 74 int extproc, flag; 75 # endif /* TIOCEXT */ 76 #endif /* TIOCSTI */ 77 78 savetstp = signal(SIGTSTP, SIG_DFL); 79 savettou = signal(SIGTTOU, SIG_DFL); 80 savettin = signal(SIGTTIN, SIG_DFL); 81 errs = 0; 82 #ifndef TIOCSTI 83 ttyset = 0; 84 #endif 85 if (tcgetattr(fileno(stdin), &ttybuf) < 0) { 86 warn("tcgetattr(stdin)"); 87 return (-1); 88 } 89 c_erase = ttybuf.c_cc[VERASE]; 90 c_kill = ttybuf.c_cc[VKILL]; 91 #ifndef TIOCSTI 92 ttybuf.c_cc[VERASE] = _POSIX_VDISABLE; 93 ttybuf.c_cc[VKILL] = _POSIX_VDISABLE; 94 if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) 95 (void)signal(SIGINT, SIG_DFL); 96 if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) 97 (void)signal(SIGQUIT, SIG_DFL); 98 #else 99 # ifdef TIOCEXT 100 extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0); 101 if (extproc) { 102 flag = 0; 103 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 104 warn("TIOCEXT: off"); 105 } 106 # endif /* TIOCEXT */ 107 if (setjmp(intjmp)) 108 goto out; 109 saveint = signal(SIGINT, ttyint); 110 #endif 111 if (gflags & GTO) { 112 #ifndef TIOCSTI 113 if (!ttyset && hp->h_to != NULL) 114 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 115 #endif 116 hp->h_to = 117 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 118 } 119 if (gflags & GSUBJECT) { 120 #ifndef TIOCSTI 121 if (!ttyset && hp->h_subject != NULL) 122 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 123 #endif 124 hp->h_subject = readtty("Subject: ", hp->h_subject); 125 } 126 if (gflags & GCC) { 127 #ifndef TIOCSTI 128 if (!ttyset && hp->h_cc != NULL) 129 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 130 #endif 131 hp->h_cc = 132 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 133 } 134 if (gflags & GBCC) { 135 #ifndef TIOCSTI 136 if (!ttyset && hp->h_bcc != NULL) 137 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 138 #endif 139 hp->h_bcc = 140 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 141 } 142 out: 143 (void)signal(SIGTSTP, savetstp); 144 (void)signal(SIGTTOU, savettou); 145 (void)signal(SIGTTIN, savettin); 146 #ifndef TIOCSTI 147 ttybuf.c_cc[VERASE] = c_erase; 148 ttybuf.c_cc[VKILL] = c_kill; 149 if (ttyset) 150 tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 151 (void)signal(SIGQUIT, savequit); 152 #else 153 # ifdef TIOCEXT 154 if (extproc) { 155 flag = 1; 156 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 157 warn("TIOCEXT: on"); 158 } 159 # endif /* TIOCEXT */ 160 #endif 161 (void)signal(SIGINT, saveint); 162 return (errs); 163 } 164 165 /* 166 * Read up a header from standard input. 167 * The source string has the preliminary contents to 168 * be read. 169 * 170 */ 171 172 char * 173 readtty(const char *pr, char src[]) 174 { 175 char ch, canonb[BUFSIZ]; 176 int c; 177 char *cp, *cp2; 178 179 fputs(pr, stdout); 180 (void)fflush(stdout); 181 if (src != NULL && strlen(src) > BUFSIZ - 2) { 182 printf("too long to edit\n"); 183 return (src); 184 } 185 #ifndef TIOCSTI 186 if (src != NULL) 187 strlcpy(canonb, src, sizeof(canonb)); 188 else 189 *canonb = '\0'; 190 fputs(canonb, stdout); 191 (void)fflush(stdout); 192 #else 193 cp = src == NULL ? "" : src; 194 while ((c = *cp++) != '\0') { 195 if ((c_erase != _POSIX_VDISABLE && c == c_erase) || 196 (c_kill != _POSIX_VDISABLE && 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 (void)signal(SIGTSTP, ttystop); 213 (void)signal(SIGTTOU, ttystop); 214 (void)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 (void)signal(SIGTSTP, SIG_DFL); 224 (void)signal(SIGTTOU, SIG_DFL); 225 (void)signal(SIGTTIN, SIG_DFL); 226 if (c == EOF && ferror(stdin)) { 227 redo: 228 cp = strlen(canonb) > 0 ? canonb : NULL; 229 clearerr(stdin); 230 return (readtty(pr, cp)); 231 } 232 #ifndef TIOCSTI 233 if (cp == NULL || *cp == '\0') 234 return (src); 235 cp2 = cp; 236 if (!ttyset) 237 return (strlen(canonb) > 0 ? savestr(canonb) : NULL); 238 while (*cp != '\0') { 239 c = *cp++; 240 if (c_erase != _POSIX_VDISABLE && 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_kill != _POSIX_VDISABLE && 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 (NULL); 266 return (savestr(canonb)); 267 } 268 269 /* 270 * Receipt continuation. 271 */ 272 void 273 ttystop(int s) 274 { 275 sig_t old_action = signal(s, SIG_DFL); 276 sigset_t nset; 277 278 (void)sigemptyset(&nset); 279 (void)sigaddset(&nset, s); 280 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 281 kill(0, s); 282 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 283 (void)signal(s, old_action); 284 longjmp(rewrite, 1); 285 } 286 287 void 288 ttyint(int s __unused) 289 { 290 longjmp(intjmp, 1); 291 } 292