tty.c revision 1.15
1 /* $NetBSD: tty.c,v 1.15 2002/03/05 21:18:15 wiz Exp $ */ 2 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)tty.c 8.2 (Berkeley) 6/6/93"; 40 #else 41 __RCSID("$NetBSD: tty.c,v 1.15 2002/03/05 21:18:15 wiz Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 /* 46 * Mail -- a mail program 47 * 48 * Generally useful tty stuff. 49 */ 50 51 #include "rcv.h" 52 #include "extern.h" 53 54 static cc_t c_erase; /* Current erase char */ 55 static cc_t c_kill; /* Current kill char */ 56 static jmp_buf rewrite; /* Place to go when continued */ 57 static jmp_buf intjmp; /* Place to go when interrupted */ 58 #ifndef TIOCSTI 59 static int ttyset; /* We must now do erase/kill */ 60 #endif 61 62 /* 63 * Read all relevant header fields. 64 */ 65 66 int 67 grabh(struct header *hp, int gflags) 68 { 69 struct termios ttybuf; 70 sig_t saveint; 71 sig_t savetstp; 72 sig_t savettou; 73 sig_t savettin; 74 int errs; 75 #ifndef TIOCSTI 76 sig_t savequit; 77 #else 78 # ifdef TIOCEXT 79 int extproc, flag; 80 # endif /* TIOCEXT */ 81 #endif /* TIOCSTI */ 82 83 #ifdef __GNUC__ 84 /* Avoid longjmp clobbering */ 85 # if defined(TIOCSTI) && defined(TIOCEXT) 86 (void)&extproc; 87 # endif 88 (void)&saveint; 89 #endif /* __GNUC__ */ 90 91 savetstp = signal(SIGTSTP, SIG_DFL); 92 savettou = signal(SIGTTOU, SIG_DFL); 93 savettin = signal(SIGTTIN, SIG_DFL); 94 errs = 0; 95 #ifndef TIOCSTI 96 ttyset = 0; 97 #endif 98 if (tcgetattr(fileno(stdin), &ttybuf) < 0) { 99 perror("tcgetattr"); 100 return(-1); 101 } 102 c_erase = ttybuf.c_cc[VERASE]; 103 c_kill = ttybuf.c_cc[VKILL]; 104 #ifndef TIOCSTI 105 ttybuf.c_cc[VERASE] = _POSIX_VDISABLE; 106 ttybuf.c_cc[VKILL] = _POSIX_VDISABLE; 107 if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) 108 signal(SIGINT, SIG_DFL); 109 if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) 110 signal(SIGQUIT, SIG_DFL); 111 #else 112 # ifdef TIOCEXT 113 extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0); 114 if (extproc) { 115 flag = 0; 116 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 117 perror("TIOCEXT: off"); 118 } 119 # endif /* TIOCEXT */ 120 if (setjmp(intjmp)) 121 goto out; 122 saveint = signal(SIGINT, ttyint); 123 #endif 124 if (gflags & GTO) { 125 #ifndef TIOCSTI 126 if (!ttyset && hp->h_to != NULL) 127 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 128 #endif 129 hp->h_to = 130 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 131 } 132 if (gflags & GSUBJECT) { 133 #ifndef TIOCSTI 134 if (!ttyset && hp->h_subject != NULL) 135 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 136 #endif 137 hp->h_subject = readtty("Subject: ", hp->h_subject); 138 } 139 if (gflags & GCC) { 140 #ifndef TIOCSTI 141 if (!ttyset && hp->h_cc != NULL) 142 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 143 #endif 144 hp->h_cc = 145 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 146 } 147 if (gflags & GBCC) { 148 #ifndef TIOCSTI 149 if (!ttyset && hp->h_bcc != NULL) 150 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 151 #endif 152 hp->h_bcc = 153 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 154 } 155 out: 156 signal(SIGTSTP, savetstp); 157 signal(SIGTTOU, savettou); 158 signal(SIGTTIN, savettin); 159 #ifndef TIOCSTI 160 ttybuf.c_cc[VERASE] = c_erase; 161 ttybuf.c_cc[VKILL] = c_kill; 162 if (ttyset) 163 tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 164 signal(SIGQUIT, savequit); 165 #else 166 # ifdef TIOCEXT 167 if (extproc) { 168 flag = 1; 169 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 170 perror("TIOCEXT: on"); 171 } 172 # endif /* TIOCEXT */ 173 #endif 174 signal(SIGINT, saveint); 175 return(errs); 176 } 177 178 /* 179 * Read up a header from standard input. 180 * The source string has the preliminary contents to 181 * be read. 182 * 183 */ 184 185 char * 186 readtty(char pr[], char src[]) 187 { 188 char ch, canonb[BUFSIZ]; 189 int c; 190 char *cp, *cp2; 191 #if __GNUC__ 192 /* Avoid longjmp clobbering */ 193 (void)&c; 194 (void)&cp2; 195 #endif 196 197 fputs(pr, stdout); 198 fflush(stdout); 199 if (src != NULL && strlen(src) > BUFSIZ - 2) { 200 printf("too long to edit\n"); 201 return(src); 202 } 203 #ifndef TIOCSTI 204 if (src != NULL) 205 cp = copy(src, canonb); 206 else 207 cp = copy("", canonb); 208 fputs(canonb, stdout); 209 fflush(stdout); 210 #else 211 cp = src == NULL ? "" : src; 212 while ((c = *cp++) != '\0') { 213 if ((c_erase != _POSIX_VDISABLE && c == c_erase) || 214 (c_kill != _POSIX_VDISABLE && c == c_kill)) { 215 ch = '\\'; 216 ioctl(0, TIOCSTI, &ch); 217 } 218 ch = c; 219 ioctl(0, TIOCSTI, &ch); 220 } 221 cp = canonb; 222 *cp = 0; 223 #endif 224 cp2 = cp; 225 while (cp2 < canonb + BUFSIZ) 226 *cp2++ = 0; 227 cp2 = cp; 228 if (setjmp(rewrite)) 229 goto redo; 230 signal(SIGTSTP, ttystop); 231 signal(SIGTTOU, ttystop); 232 signal(SIGTTIN, ttystop); 233 clearerr(stdin); 234 while (cp2 < canonb + BUFSIZ) { 235 c = getc(stdin); 236 if (c == EOF || c == '\n') 237 break; 238 *cp2++ = c; 239 } 240 *cp2 = 0; 241 signal(SIGTSTP, SIG_DFL); 242 signal(SIGTTOU, SIG_DFL); 243 signal(SIGTTIN, SIG_DFL); 244 if (c == EOF && ferror(stdin)) { 245 redo: 246 cp = strlen(canonb) > 0 ? canonb : NULL; 247 clearerr(stdin); 248 return(readtty(pr, cp)); 249 } 250 #ifndef TIOCSTI 251 if (cp == NULL || *cp == '\0') 252 return(src); 253 cp2 = cp; 254 if (!ttyset) 255 return(strlen(canonb) > 0 ? savestr(canonb) : NULL); 256 while (*cp != '\0') { 257 c = *cp++; 258 if (c_erase != _POSIX_VDISABLE && c == c_erase) { 259 if (cp2 == canonb) 260 continue; 261 if (cp2[-1] == '\\') { 262 cp2[-1] = c; 263 continue; 264 } 265 cp2--; 266 continue; 267 } 268 if (c_kill != _POSIX_VDISABLE && c == c_kill) { 269 if (cp2 == canonb) 270 continue; 271 if (cp2[-1] == '\\') { 272 cp2[-1] = c; 273 continue; 274 } 275 cp2 = canonb; 276 continue; 277 } 278 *cp2++ = c; 279 } 280 *cp2 = '\0'; 281 #endif 282 if (equal("", canonb)) 283 return(NULL); 284 return(savestr(canonb)); 285 } 286 287 /* 288 * Receipt continuation. 289 */ 290 void 291 ttystop(int s) 292 { 293 sig_t old_action = signal(s, SIG_DFL); 294 sigset_t nset; 295 296 sigemptyset(&nset); 297 sigaddset(&nset, s); 298 sigprocmask(SIG_BLOCK, &nset, NULL); 299 kill(0, s); 300 sigprocmask(SIG_UNBLOCK, &nset, NULL); 301 signal(s, old_action); 302 longjmp(rewrite, 1); 303 } 304 305 /*ARGSUSED*/ 306 void 307 ttyint(int s) 308 { 309 longjmp(intjmp, 1); 310 } 311
Indexes created Thu Sep 25 08:09:54 GMT 2025