tty.c revision 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[] = "from: @(#)tty.c 8.1 (Berkeley) 6/6/93"; 36 static char rcsid[] = "$Id: tty.c,v 1.3 1994/06/29 05:09:47 deraadt 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 #include "extern.h" 47 48 static int c_erase; /* Current erase char */ 49 static int c_kill; /* Current kill char */ 50 static jmp_buf rewrite; /* Place to go when continued */ 51 static jmp_buf intjmp; /* Place to go when interrupted */ 52 #ifndef TIOCSTI 53 static int ttyset; /* We must now do erase/kill */ 54 #endif 55 56 /* 57 * Read all relevant header fields. 58 */ 59 60 int 61 grabh(hp, gflags) 62 struct header *hp; 63 int gflags; 64 { 65 struct sgttyb ttybuf; 66 sig_t saveint; 67 #ifndef TIOCSTI 68 sig_t savequit; 69 #endif 70 sig_t savetstp; 71 sig_t savettou; 72 sig_t savettin; 73 int errs; 74 void ttyint(); 75 76 savetstp = signal(SIGTSTP, SIG_DFL); 77 savettou = signal(SIGTTOU, SIG_DFL); 78 savettin = signal(SIGTTIN, SIG_DFL); 79 errs = 0; 80 #ifndef TIOCSTI 81 ttyset = 0; 82 #endif 83 if (ioctl(fileno(stdin), TIOCGETP, &ttybuf) < 0) { 84 perror("gtty"); 85 return(-1); 86 } 87 c_erase = ttybuf.sg_erase; 88 c_kill = ttybuf.sg_kill; 89 #ifndef TIOCSTI 90 ttybuf.sg_erase = 0; 91 ttybuf.sg_kill = 0; 92 if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) 93 signal(SIGINT, SIG_DFL); 94 if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) 95 signal(SIGQUIT, SIG_DFL); 96 #else 97 if (setjmp(intjmp)) 98 goto out; 99 saveint = signal(SIGINT, ttyint); 100 #endif 101 if (gflags & GTO) { 102 #ifndef TIOCSTI 103 if (!ttyset && hp->h_to != NIL) 104 ttyset++, stty(fileno(stdin), &ttybuf); 105 #endif 106 hp->h_to = 107 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 108 } 109 if (gflags & GSUBJECT) { 110 #ifndef TIOCSTI 111 if (!ttyset && hp->h_subject != NOSTR) 112 ttyset++, stty(fileno(stdin), &ttybuf); 113 #endif 114 hp->h_subject = readtty("Subject: ", hp->h_subject); 115 } 116 if (gflags & GCC) { 117 #ifndef TIOCSTI 118 if (!ttyset && hp->h_cc != NIL) 119 ttyset++, stty(fileno(stdin), &ttybuf); 120 #endif 121 hp->h_cc = 122 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 123 } 124 if (gflags & GBCC) { 125 #ifndef TIOCSTI 126 if (!ttyset && hp->h_bcc != NIL) 127 ttyset++, stty(fileno(stdin), &ttybuf); 128 #endif 129 hp->h_bcc = 130 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 131 } 132 out: 133 signal(SIGTSTP, savetstp); 134 signal(SIGTTOU, savettou); 135 signal(SIGTTIN, savettin); 136 #ifndef TIOCSTI 137 ttybuf.sg_erase = c_erase; 138 ttybuf.sg_kill = c_kill; 139 if (ttyset) 140 stty(fileno(stdin), &ttybuf); 141 signal(SIGQUIT, savequit); 142 #endif 143 signal(SIGINT, saveint); 144 return(errs); 145 } 146 147 /* 148 * Read up a header from standard input. 149 * The source string has the preliminary contents to 150 * be read. 151 * 152 */ 153 154 char * 155 readtty(pr, src) 156 char pr[], src[]; 157 { 158 char ch, canonb[BUFSIZ]; 159 int c; 160 register char *cp, *cp2; 161 void ttystop(); 162 163 fputs(pr, stdout); 164 fflush(stdout); 165 if (src != NOSTR && strlen(src) > BUFSIZ - 2) { 166 printf("too long to edit\n"); 167 return(src); 168 } 169 #ifndef TIOCSTI 170 if (src != NOSTR) 171 cp = copy(src, canonb); 172 else 173 cp = copy("", canonb); 174 fputs(canonb, stdout); 175 fflush(stdout); 176 #else 177 cp = src == NOSTR ? "" : src; 178 while (c = *cp++) { 179 if (c == c_erase || c == c_kill) { 180 ch = '\\'; 181 ioctl(0, TIOCSTI, &ch); 182 } 183 ch = c; 184 ioctl(0, TIOCSTI, &ch); 185 } 186 cp = canonb; 187 *cp = 0; 188 #endif 189 cp2 = cp; 190 while (cp2 < canonb + BUFSIZ) 191 *cp2++ = 0; 192 cp2 = cp; 193 if (setjmp(rewrite)) 194 goto redo; 195 signal(SIGTSTP, ttystop); 196 signal(SIGTTOU, ttystop); 197 signal(SIGTTIN, ttystop); 198 clearerr(stdin); 199 while (cp2 < canonb + BUFSIZ) { 200 c = getc(stdin); 201 if (c == EOF || c == '\n') 202 break; 203 *cp2++ = c; 204 } 205 *cp2 = 0; 206 signal(SIGTSTP, SIG_DFL); 207 signal(SIGTTOU, SIG_DFL); 208 signal(SIGTTIN, SIG_DFL); 209 if (c == EOF && ferror(stdin)) { 210 redo: 211 cp = strlen(canonb) > 0 ? canonb : NOSTR; 212 clearerr(stdin); 213 return(readtty(pr, cp)); 214 } 215 #ifndef TIOCSTI 216 if (cp == NOSTR || *cp == '\0') 217 return(src); 218 cp2 = cp; 219 if (!ttyset) 220 return(strlen(canonb) > 0 ? savestr(canonb) : NOSTR); 221 while (*cp != '\0') { 222 c = *cp++; 223 if (c == c_erase) { 224 if (cp2 == canonb) 225 continue; 226 if (cp2[-1] == '\\') { 227 cp2[-1] = c; 228 continue; 229 } 230 cp2--; 231 continue; 232 } 233 if (c == c_kill) { 234 if (cp2 == canonb) 235 continue; 236 if (cp2[-1] == '\\') { 237 cp2[-1] = c; 238 continue; 239 } 240 cp2 = canonb; 241 continue; 242 } 243 *cp2++ = c; 244 } 245 *cp2 = '\0'; 246 #endif 247 if (equal("", canonb)) 248 return(NOSTR); 249 return(savestr(canonb)); 250 } 251 252 /* 253 * Receipt continuation. 254 */ 255 void 256 ttystop(s) 257 int s; 258 { 259 sig_t old_action = signal(s, SIG_DFL); 260 261 sigsetmask(sigblock(0) & ~sigmask(s)); 262 kill(0, s); 263 sigblock(sigmask(s)); 264 signal(s, old_action); 265 longjmp(rewrite, 1); 266 } 267 268 /*ARGSUSED*/ 269 void 270 ttyint(s) 271 int s; 272 { 273 longjmp(intjmp, 1); 274 } 275
Indexes created Thu Sep 25 16:09:42 GMT 2025