tty.c revision 1.1
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[] = "@(#)tty.c 5.12 (Berkeley) 4/1/91"; 36 #endif /* not lint */ 37 38 /* 39 * Mail -- a mail program 40 * 41 * Generally useful tty stuff. 42 */ 43 44 #include "rcv.h" 45 46 static int c_erase; /* Current erase char */ 47 static int c_kill; /* Current kill char */ 48 static jmp_buf rewrite; /* Place to go when continued */ 49 static jmp_buf intjmp; /* Place to go when interrupted */ 50 #ifndef TIOCSTI 51 static int ttyset; /* We must now do erase/kill */ 52 #endif 53 54 /* 55 * Read all relevant header fields. 56 */ 57 58 grabh(hp, gflags) 59 struct header *hp; 60 { 61 struct sgttyb ttybuf; 62 sig_t saveint; 63 #ifndef TIOCSTI 64 sig_t savequit; 65 #endif 66 sig_t savetstp; 67 sig_t savettou; 68 sig_t savettin; 69 int errs; 70 void ttyint(); 71 72 savetstp = signal(SIGTSTP, SIG_DFL); 73 savettou = signal(SIGTTOU, SIG_DFL); 74 savettin = signal(SIGTTIN, SIG_DFL); 75 errs = 0; 76 #ifndef TIOCSTI 77 ttyset = 0; 78 #endif 79 if (ioctl(fileno(stdin), TIOCGETP, &ttybuf) < 0) { 80 perror("gtty"); 81 return(-1); 82 } 83 c_erase = ttybuf.sg_erase; 84 c_kill = ttybuf.sg_kill; 85 #ifndef TIOCSTI 86 ttybuf.sg_erase = 0; 87 ttybuf.sg_kill = 0; 88 if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) 89 signal(SIGINT, SIG_DFL); 90 if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) 91 signal(SIGQUIT, SIG_DFL); 92 #else 93 if (setjmp(intjmp)) 94 goto out; 95 saveint = signal(SIGINT, ttyint); 96 #endif 97 if (gflags & GTO) { 98 #ifndef TIOCSTI 99 if (!ttyset && hp->h_to != NIL) 100 ttyset++, stty(fileno(stdin), &ttybuf); 101 #endif 102 hp->h_to = 103 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 104 } 105 if (gflags & GSUBJECT) { 106 #ifndef TIOCSTI 107 if (!ttyset && hp->h_subject != NOSTR) 108 ttyset++, stty(fileno(stdin), &ttybuf); 109 #endif 110 hp->h_subject = readtty("Subject: ", hp->h_subject); 111 } 112 if (gflags & GCC) { 113 #ifndef TIOCSTI 114 if (!ttyset && hp->h_cc != NIL) 115 ttyset++, stty(fileno(stdin), &ttybuf); 116 #endif 117 hp->h_cc = 118 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 119 } 120 if (gflags & GBCC) { 121 #ifndef TIOCSTI 122 if (!ttyset && hp->h_bcc != NIL) 123 ttyset++, stty(fileno(stdin), &ttybuf); 124 #endif 125 hp->h_bcc = 126 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 127 } 128 out: 129 signal(SIGTSTP, savetstp); 130 signal(SIGTTOU, savettou); 131 signal(SIGTTIN, savettin); 132 #ifndef TIOCSTI 133 ttybuf.sg_erase = c_erase; 134 ttybuf.sg_kill = c_kill; 135 if (ttyset) 136 stty(fileno(stdin), &ttybuf); 137 signal(SIGQUIT, savequit); 138 #endif 139 signal(SIGINT, saveint); 140 return(errs); 141 } 142 143 /* 144 * Read up a header from standard input. 145 * The source string has the preliminary contents to 146 * be read. 147 * 148 */ 149 150 char * 151 readtty(pr, src) 152 char pr[], src[]; 153 { 154 char ch, canonb[BUFSIZ]; 155 int c; 156 register char *cp, *cp2; 157 void ttystop(); 158 159 fputs(pr, stdout); 160 fflush(stdout); 161 if (src != NOSTR && strlen(src) > BUFSIZ - 2) { 162 printf("too long to edit\n"); 163 return(src); 164 } 165 #ifndef TIOCSTI 166 if (src != NOSTR) 167 cp = copy(src, canonb); 168 else 169 cp = copy("", canonb); 170 fputs(canonb, stdout); 171 fflush(stdout); 172 #else 173 cp = src == NOSTR ? "" : src; 174 while (c = *cp++) { 175 if (c == c_erase || c == c_kill) { 176 ch = '\\'; 177 ioctl(0, TIOCSTI, &ch); 178 } 179 ch = c; 180 ioctl(0, TIOCSTI, &ch); 181 } 182 cp = canonb; 183 *cp = 0; 184 #endif 185 cp2 = cp; 186 while (cp2 < canonb + BUFSIZ) 187 *cp2++ = 0; 188 cp2 = cp; 189 if (setjmp(rewrite)) 190 goto redo; 191 signal(SIGTSTP, ttystop); 192 signal(SIGTTOU, ttystop); 193 signal(SIGTTIN, ttystop); 194 clearerr(stdin); 195 while (cp2 < canonb + BUFSIZ) { 196 c = getc(stdin); 197 if (c == EOF || c == '\n') 198 break; 199 *cp2++ = c; 200 } 201 *cp2 = 0; 202 signal(SIGTSTP, SIG_DFL); 203 signal(SIGTTOU, SIG_DFL); 204 signal(SIGTTIN, SIG_DFL); 205 if (c == EOF && ferror(stdin)) { 206 redo: 207 cp = strlen(canonb) > 0 ? canonb : NOSTR; 208 clearerr(stdin); 209 return(readtty(pr, cp)); 210 } 211 #ifndef TIOCSTI 212 if (cp == NOSTR || *cp == '\0') 213 return(src); 214 cp2 = cp; 215 if (!ttyset) 216 return(strlen(canonb) > 0 ? savestr(canonb) : NOSTR); 217 while (*cp != '\0') { 218 c = *cp++; 219 if (c == c_erase) { 220 if (cp2 == canonb) 221 continue; 222 if (cp2[-1] == '\\') { 223 cp2[-1] = c; 224 continue; 225 } 226 cp2--; 227 continue; 228 } 229 if (c == c_kill) { 230 if (cp2 == canonb) 231 continue; 232 if (cp2[-1] == '\\') { 233 cp2[-1] = c; 234 continue; 235 } 236 cp2 = canonb; 237 continue; 238 } 239 *cp2++ = c; 240 } 241 *cp2 = '\0'; 242 #endif 243 if (equal("", canonb)) 244 return(NOSTR); 245 return(savestr(canonb)); 246 } 247 248 /* 249 * Receipt continuation. 250 */ 251 void 252 ttystop(s) 253 { 254 sig_t old_action = signal(s, SIG_DFL); 255 256 sigsetmask(sigblock(0) & ~sigmask(s)); 257 kill(0, s); 258 sigblock(sigmask(s)); 259 signal(s, old_action); 260 longjmp(rewrite, 1); 261 } 262 263 /*ARGSUSED*/ 264 void 265 ttyint(s) 266 { 267 longjmp(intjmp, 1); 268 } 269
Indexes created Fri Sep 26 08:10:20 GMT 2025