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 /* 33 * Mail -- a mail program 34 * 35 * Generally useful tty stuff. 36 */ 37 38 #include "rcv.h" 39 #include "extern.h" 40 41 static cc_t c_erase; /* Current erase char */ 42 static cc_t c_kill; /* Current kill char */ 43 static jmp_buf rewrite; /* Place to go when continued */ 44 static jmp_buf intjmp; /* Place to go when interrupted */ 45 #ifndef TIOCSTI 46 static int ttyset; /* We must now do erase/kill */ 47 #endif 48 49 /* 50 * Read all relevant header fields. 51 */ 52 53 int 54 grabh(struct header *hp, int gflags) 55 { 56 struct termios ttybuf; 57 sig_t saveint; 58 sig_t savetstp; 59 sig_t savettou; 60 sig_t savettin; 61 int errs; 62 #ifndef TIOCSTI 63 sig_t savequit; 64 #else 65 # ifdef TIOCEXT 66 int extproc, flag; 67 # endif /* TIOCEXT */ 68 #endif /* TIOCSTI */ 69 70 savetstp = signal(SIGTSTP, SIG_DFL); 71 savettou = signal(SIGTTOU, SIG_DFL); 72 savettin = signal(SIGTTIN, SIG_DFL); 73 errs = 0; 74 #ifndef TIOCSTI 75 ttyset = 0; 76 #endif 77 if (tcgetattr(fileno(stdin), &ttybuf) < 0) { 78 warn("tcgetattr(stdin)"); 79 return (-1); 80 } 81 c_erase = ttybuf.c_cc[VERASE]; 82 c_kill = ttybuf.c_cc[VKILL]; 83 #ifndef TIOCSTI 84 ttybuf.c_cc[VERASE] = _POSIX_VDISABLE; 85 ttybuf.c_cc[VKILL] = _POSIX_VDISABLE; 86 if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) 87 (void)signal(SIGINT, SIG_DFL); 88 if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) 89 (void)signal(SIGQUIT, SIG_DFL); 90 #else 91 # ifdef TIOCEXT 92 extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0); 93 if (extproc) { 94 flag = 0; 95 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 96 warn("TIOCEXT: off"); 97 } 98 # endif /* TIOCEXT */ 99 if (setjmp(intjmp)) 100 goto out; 101 saveint = signal(SIGINT, ttyint); 102 #endif 103 if (gflags & GTO) { 104 #ifndef TIOCSTI 105 if (!ttyset && hp->h_to != NULL) 106 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 107 #endif 108 hp->h_to = 109 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 110 } 111 if (gflags & GSUBJECT) { 112 #ifndef TIOCSTI 113 if (!ttyset && hp->h_subject != NULL) 114 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 115 #endif 116 hp->h_subject = readtty("Subject: ", hp->h_subject); 117 } 118 if (gflags & GCC) { 119 #ifndef TIOCSTI 120 if (!ttyset && hp->h_cc != NULL) 121 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 122 #endif 123 hp->h_cc = 124 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 125 } 126 if (gflags & GBCC) { 127 #ifndef TIOCSTI 128 if (!ttyset && hp->h_bcc != NULL) 129 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 130 #endif 131 hp->h_bcc = 132 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 133 } 134 #ifdef TIOCSTI 135 out: 136 #endif 137 (void)signal(SIGTSTP, savetstp); 138 (void)signal(SIGTTOU, savettou); 139 (void)signal(SIGTTIN, savettin); 140 #ifndef TIOCSTI 141 ttybuf.c_cc[VERASE] = c_erase; 142 ttybuf.c_cc[VKILL] = c_kill; 143 if (ttyset) 144 tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 145 (void)signal(SIGQUIT, savequit); 146 #else 147 # ifdef TIOCEXT 148 if (extproc) { 149 flag = 1; 150 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 151 warn("TIOCEXT: on"); 152 } 153 # endif /* TIOCEXT */ 154 #endif 155 (void)signal(SIGINT, saveint); 156 return (errs); 157 } 158 159 /* 160 * Read up a header from standard input. 161 * The source string has the preliminary contents to 162 * be read. 163 * 164 */ 165 166 char * 167 readtty(const char *pr, char src[]) 168 { 169 char canonb[BUFSIZ]; 170 #ifdef TIOCSTI 171 char ch; 172 #endif 173 int c; 174 char *cp, *cp2; 175 176 fputs(pr, stdout); 177 (void)fflush(stdout); 178 if (src != NULL && strlen(src) > BUFSIZ - 2) { 179 printf("too long to edit\n"); 180 return (src); 181 } 182 #ifndef TIOCSTI 183 if (src != NULL) 184 strlcpy(canonb, src, sizeof(canonb)); 185 else 186 *canonb = '\0'; 187 fputs(canonb, stdout); 188 (void)fflush(stdout); 189 #else 190 cp = src == NULL ? "" : src; 191 while ((c = *cp++) != '\0') { 192 if ((c_erase != _POSIX_VDISABLE && c == c_erase) || 193 (c_kill != _POSIX_VDISABLE && c == c_kill)) { 194 ch = '\\'; 195 ioctl(0, TIOCSTI, &ch); 196 } 197 ch = c; 198 ioctl(0, TIOCSTI, &ch); 199 } 200 cp = canonb; 201 *cp = '\0'; 202 #endif 203 cp2 = cp; 204 while (cp2 < canonb + BUFSIZ) 205 *cp2++ = '\0'; 206 cp2 = cp; 207 if (setjmp(rewrite)) 208 goto redo; 209 (void)signal(SIGTSTP, ttystop); 210 (void)signal(SIGTTOU, ttystop); 211 (void)signal(SIGTTIN, ttystop); 212 clearerr(stdin); 213 while (cp2 < canonb + BUFSIZ) { 214 c = getc(stdin); 215 if (c == EOF || c == '\n') 216 break; 217 *cp2++ = c; 218 } 219 *cp2 = '\0'; 220 (void)signal(SIGTSTP, SIG_DFL); 221 (void)signal(SIGTTOU, SIG_DFL); 222 (void)signal(SIGTTIN, SIG_DFL); 223 if (c == EOF && ferror(stdin)) { 224 redo: 225 cp = strlen(canonb) > 0 ? canonb : NULL; 226 clearerr(stdin); 227 return (readtty(pr, cp)); 228 } 229 #ifndef TIOCSTI 230 if (cp == NULL || *cp == '\0') 231 return (src); 232 cp2 = cp; 233 if (!ttyset) 234 return (strlen(canonb) > 0 ? savestr(canonb) : NULL); 235 while (*cp != '\0') { 236 c = *cp++; 237 if (c_erase != _POSIX_VDISABLE && c == c_erase) { 238 if (cp2 == canonb) 239 continue; 240 if (cp2[-1] == '\\') { 241 cp2[-1] = c; 242 continue; 243 } 244 cp2--; 245 continue; 246 } 247 if (c_kill != _POSIX_VDISABLE && c == c_kill) { 248 if (cp2 == canonb) 249 continue; 250 if (cp2[-1] == '\\') { 251 cp2[-1] = c; 252 continue; 253 } 254 cp2 = canonb; 255 continue; 256 } 257 *cp2++ = c; 258 } 259 *cp2 = '\0'; 260 #endif 261 if (equal("", canonb)) 262 return (NULL); 263 return (savestr(canonb)); 264 } 265 266 /* 267 * Receipt continuation. 268 */ 269 void 270 ttystop(int s) 271 { 272 sig_t old_action = signal(s, SIG_DFL); 273 sigset_t nset; 274 275 (void)sigemptyset(&nset); 276 (void)sigaddset(&nset, s); 277 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 278 kill(0, s); 279 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 280 (void)signal(s, old_action); 281 longjmp(rewrite, 1); 282 } 283 284 void 285 ttyint(int s __unused) 286 { 287 longjmp(intjmp, 1); 288 } 289