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 * $FreeBSD$ 34 */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)lex.c 8.1 (Berkeley) 6/6/93"; 39 #endif 40 static const char rcsid[] = 41 "$FreeBSD$"; 42 #endif /* not lint */ 43 44 #include "rcv.h" 45 #include <errno.h> 46 #include <fcntl.h> 47 #include "extern.h" 48 49 /* 50 * Mail -- a mail program 51 * 52 * Lexical processing of commands. 53 */ 54 55 const char *prompt = "& "; 56 57 extern const struct cmd cmdtab[]; 58 extern const char *version; 59 60 /* 61 * Set up editing on the given file name. 62 * If the first character of name is %, we are considered to be 63 * editing the file, otherwise we are reading our mail which has 64 * signficance for mbox and so forth. 65 */ 66 int 67 setfile(name) 68 char *name; 69 { 70 FILE *ibuf; 71 int i, fd; 72 struct stat stb; 73 char isedit = *name != '%'; 74 char *who = name[1] ? name + 1 : myname; 75 char tempname[PATHSIZE]; 76 static int shudclob; 77 78 if ((name = expand(name)) == NULL) 79 return (-1); 80 81 if ((ibuf = Fopen(name, "r")) == NULL) { 82 if (!isedit && errno == ENOENT) 83 goto nomail; 84 warn("%s", name); 85 return (-1); 86 } 87 88 if (fstat(fileno(ibuf), &stb) < 0) { 89 warn("fstat"); 90 (void)Fclose(ibuf); 91 return (-1); 92 } 93 94 if (S_ISDIR(stb.st_mode) || !S_ISREG(stb.st_mode)) { 95 (void)Fclose(ibuf); 96 errno = S_ISDIR(stb.st_mode) ? EISDIR : EINVAL; 97 warn("%s", name); 98 return (-1); 99 } 100 101 /* 102 * Looks like all will be well. We must now relinquish our 103 * hold on the current set of stuff. Must hold signals 104 * while we are reading the new file, else we will ruin 105 * the message[] data structure. 106 */ 107 108 holdsigs(); 109 if (shudclob) 110 quit(); 111 112 /* 113 * Copy the messages into /tmp 114 * and set pointers. 115 */ 116 117 readonly = 0; 118 if ((i = open(name, 1)) < 0) 119 readonly++; 120 else 121 (void)close(i); 122 if (shudclob) { 123 (void)fclose(itf); 124 (void)fclose(otf); 125 } 126 shudclob = 1; 127 edit = isedit; 128 strlcpy(prevfile, mailname, sizeof(prevfile)); 129 if (name != mailname) 130 strlcpy(mailname, name, sizeof(mailname)); 131 mailsize = fsize(ibuf); 132 (void)snprintf(tempname, sizeof(tempname), 133 "%s/mail.RxXXXXXXXXXX", tmpdir); 134 if ((fd = mkstemp(tempname)) == -1 || (otf = fdopen(fd, "w")) == NULL) 135 err(1, "%s", tempname); 136 (void)fcntl(fileno(otf), F_SETFD, 1); 137 if ((itf = fopen(tempname, "r")) == NULL) 138 err(1, "%s", tempname); 139 (void)fcntl(fileno(itf), F_SETFD, 1); 140 (void)rm(tempname); 141 setptr(ibuf); 142 setmsize(msgCount); 143 (void)Fclose(ibuf); 144 relsesigs(); 145 sawcom = 0; 146 if (!edit && msgCount == 0) { 147 nomail: 148 fprintf(stderr, "No mail for %s\n", who); 149 return (-1); 150 } 151 return (0); 152 } 153 154 int *msgvec; 155 int reset_on_stop; /* do a reset() if stopped */ 156 157 /* 158 * Interpret user commands one by one. If standard input is not a tty, 159 * print no prompt. 160 */ 161 void 162 commands() 163 { 164 int n, eofloop = 0; 165 char linebuf[LINESIZE]; 166 167 if (!sourcing) { 168 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 169 (void)signal(SIGINT, intr); 170 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 171 (void)signal(SIGHUP, hangup); 172 (void)signal(SIGTSTP, stop); 173 (void)signal(SIGTTOU, stop); 174 (void)signal(SIGTTIN, stop); 175 } 176 setexit(); 177 for (;;) { 178 /* 179 * Print the prompt, if needed. Clear out 180 * string space, and flush the output. 181 */ 182 if (!sourcing && value("interactive") != NULL) { 183 reset_on_stop = 1; 184 printf("%s", prompt); 185 } 186 (void)fflush(stdout); 187 sreset(); 188 /* 189 * Read a line of commands from the current input 190 * and handle end of file specially. 191 */ 192 n = 0; 193 for (;;) { 194 if (readline(input, &linebuf[n], LINESIZE - n) < 0) { 195 if (n == 0) 196 n = -1; 197 break; 198 } 199 if ((n = strlen(linebuf)) == 0) 200 break; 201 n--; 202 if (linebuf[n] != '\\') 203 break; 204 linebuf[n++] = ' '; 205 } 206 reset_on_stop = 0; 207 if (n < 0) { 208 /* eof */ 209 if (loading) 210 break; 211 if (sourcing) { 212 unstack(); 213 continue; 214 } 215 if (value("interactive") != NULL && 216 value("ignoreeof") != NULL && 217 ++eofloop < 25) { 218 printf("Use \"quit\" to quit.\n"); 219 continue; 220 } 221 break; 222 } 223 eofloop = 0; 224 if (execute(linebuf, 0)) 225 break; 226 } 227 } 228 229 /* 230 * Execute a single command. 231 * Command functions return 0 for success, 1 for error, and -1 232 * for abort. A 1 or -1 aborts a load or source. A -1 aborts 233 * the interactive command loop. 234 * Contxt is non-zero if called while composing mail. 235 */ 236 int 237 execute(linebuf, contxt) 238 char linebuf[]; 239 int contxt; 240 { 241 char word[LINESIZE]; 242 char *arglist[MAXARGC]; 243 const struct cmd *com; 244 char *cp, *cp2; 245 int c, muvec[2]; 246 int e = 1; 247 248 /* 249 * Strip the white space away from the beginning 250 * of the command, then scan out a word, which 251 * consists of anything except digits and white space. 252 * 253 * Handle ! escapes differently to get the correct 254 * lexical conventions. 255 */ 256 257 for (cp = linebuf; isspace(*cp); cp++) 258 ; 259 if (*cp == '!') { 260 if (sourcing) { 261 printf("Can't \"!\" while sourcing\n"); 262 goto out; 263 } 264 shell(cp+1); 265 return (0); 266 } 267 cp2 = word; 268 while (*cp != '\0' && strchr(" \t0123456789$^.:/-+*'\"", *cp) == NULL) 269 *cp2++ = *cp++; 270 *cp2 = '\0'; 271 272 /* 273 * Look up the command; if not found, bitch. 274 * Normally, a blank command would map to the 275 * first command in the table; while sourcing, 276 * however, we ignore blank lines to eliminate 277 * confusion. 278 */ 279 280 if (sourcing && *word == '\0') 281 return (0); 282 com = lex(word); 283 if (com == NULL) { 284 printf("Unknown command: \"%s\"\n", word); 285 goto out; 286 } 287 288 /* 289 * See if we should execute the command -- if a conditional 290 * we always execute it, otherwise, check the state of cond. 291 */ 292 293 if ((com->c_argtype & F) == 0) 294 if ((cond == CRCV && !rcvmode) || (cond == CSEND && rcvmode)) 295 return (0); 296 297 /* 298 * Process the arguments to the command, depending 299 * on the type he expects. Default to an error. 300 * If we are sourcing an interactive command, it's 301 * an error. 302 */ 303 304 if (!rcvmode && (com->c_argtype & M) == 0) { 305 printf("May not execute \"%s\" while sending\n", 306 com->c_name); 307 goto out; 308 } 309 if (sourcing && com->c_argtype & I) { 310 printf("May not execute \"%s\" while sourcing\n", 311 com->c_name); 312 goto out; 313 } 314 if (readonly && com->c_argtype & W) { 315 printf("May not execute \"%s\" -- message file is read only\n", 316 com->c_name); 317 goto out; 318 } 319 if (contxt && com->c_argtype & R) { 320 printf("Cannot recursively invoke \"%s\"\n", com->c_name); 321 goto out; 322 } 323 switch (com->c_argtype & ~(F|P|I|M|T|W|R)) { 324 case MSGLIST: 325 /* 326 * A message list defaulting to nearest forward 327 * legal message. 328 */ 329 if (msgvec == 0) { 330 printf("Illegal use of \"message list\"\n"); 331 break; 332 } 333 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) 334 break; 335 if (c == 0) { 336 *msgvec = first(com->c_msgflag, com->c_msgmask); 337 msgvec[1] = 0; 338 } 339 if (*msgvec == 0) { 340 printf("No applicable messages\n"); 341 break; 342 } 343 e = (*com->c_func)(msgvec); 344 break; 345 346 case NDMLIST: 347 /* 348 * A message list with no defaults, but no error 349 * if none exist. 350 */ 351 if (msgvec == 0) { 352 printf("Illegal use of \"message list\"\n"); 353 break; 354 } 355 if (getmsglist(cp, msgvec, com->c_msgflag) < 0) 356 break; 357 e = (*com->c_func)(msgvec); 358 break; 359 360 case STRLIST: 361 /* 362 * Just the straight string, with 363 * leading blanks removed. 364 */ 365 while (isspace(*cp)) 366 cp++; 367 e = (*com->c_func)(cp); 368 break; 369 370 case RAWLIST: 371 /* 372 * A vector of strings, in shell style. 373 */ 374 if ((c = getrawlist(cp, arglist, 375 sizeof(arglist) / sizeof(*arglist))) < 0) 376 break; 377 if (c < com->c_minargs) { 378 printf("%s requires at least %d arg(s)\n", 379 com->c_name, com->c_minargs); 380 break; 381 } 382 if (c > com->c_maxargs) { 383 printf("%s takes no more than %d arg(s)\n", 384 com->c_name, com->c_maxargs); 385 break; 386 } 387 e = (*com->c_func)(arglist); 388 break; 389 390 case NOLIST: 391 /* 392 * Just the constant zero, for exiting, 393 * eg. 394 */ 395 e = (*com->c_func)(0); 396 break; 397 398 default: 399 errx(1, "Unknown argtype"); 400 } 401 402 out: 403 /* 404 * Exit the current source file on 405 * error. 406 */ 407 if (e) { 408 if (e < 0) 409 return (1); 410 if (loading) 411 return (1); 412 if (sourcing) 413 unstack(); 414 return (0); 415 } 416 if (value("autoprint") != NULL && com->c_argtype & P) 417 if ((dot->m_flag & MDELETED) == 0) { 418 muvec[0] = dot - &message[0] + 1; 419 muvec[1] = 0; 420 type(muvec); 421 } 422 if (!sourcing && (com->c_argtype & T) == 0) 423 sawcom = 1; 424 return (0); 425 } 426 427 /* 428 * Set the size of the message vector used to construct argument 429 * lists to message list functions. 430 */ 431 void 432 setmsize(sz) 433 int sz; 434 { 435 436 if (msgvec != 0) 437 (void)free(msgvec); 438 msgvec = calloc((unsigned)(sz + 1), sizeof(*msgvec)); 439 } 440 441 /* 442 * Find the correct command in the command table corresponding 443 * to the passed command "word" 444 */ 445 446 __const struct cmd * 447 lex(word) 448 char word[]; 449 { 450 const struct cmd *cp; 451 452 /* 453 * ignore trailing chars after `#' 454 * 455 * lines with beginning `#' are comments 456 * spaces before `#' are ignored in execute() 457 */ 458 459 if (*word == '#') 460 *(word+1) = '\0'; 461 462 463 for (cp = &cmdtab[0]; cp->c_name != NULL; cp++) 464 if (isprefix(word, cp->c_name)) 465 return (cp); 466 return (NULL); 467 } 468 469 /* 470 * Determine if as1 is a valid prefix of as2. 471 * Return true if yep. 472 */ 473 int 474 isprefix(as1, as2) 475 const char *as1, *as2; 476 { 477 const char *s1, *s2; 478 479 s1 = as1; 480 s2 = as2; 481 while (*s1++ == *s2) 482 if (*s2++ == '\0') 483 return (1); 484 return (*--s1 == '\0'); 485 } 486 487 /* 488 * The following gets called on receipt of an interrupt. This is 489 * to abort printout of a command, mainly. 490 * Dispatching here when command() is inactive crashes rcv. 491 * Close all open files except 0, 1, 2, and the temporary. 492 * Also, unstack all source files. 493 */ 494 495 int inithdr; /* am printing startup headers */ 496 497 /*ARGSUSED*/ 498 void 499 intr(s) 500 int s; 501 { 502 503 noreset = 0; 504 if (!inithdr) 505 sawcom++; 506 inithdr = 0; 507 while (sourcing) 508 unstack(); 509 510 close_all_files(); 511 512 if (image >= 0) { 513 (void)close(image); 514 image = -1; 515 } 516 fprintf(stderr, "Interrupt\n"); 517 reset(0); 518 } 519 520 /* 521 * When we wake up after ^Z, reprint the prompt. 522 */ 523 void 524 stop(s) 525 int s; 526 { 527 sig_t old_action = signal(s, SIG_DFL); 528 529 (void)sigsetmask(sigblock(0) & ~sigmask(s)); 530 (void)kill(0, s); 531 (void)sigblock(sigmask(s)); 532 (void)signal(s, old_action); 533 if (reset_on_stop) { 534 reset_on_stop = 0; 535 reset(0); 536 } 537 } 538 539 /* 540 * Branch here on hangup signal and simulate "exit". 541 */ 542 /*ARGSUSED*/ 543 void 544 hangup(s) 545 int s; 546 { 547 548 /* nothing to do? */ 549 exit(1); 550 } 551 552 /* 553 * Announce the presence of the current Mail version, 554 * give the message count, and print a header listing. 555 */ 556 void 557 announce() 558 { 559 int vec[2], mdot; 560 561 mdot = newfileinfo(); 562 vec[0] = mdot; 563 vec[1] = 0; 564 dot = &message[mdot - 1]; 565 if (msgCount > 0 && value("noheader") == NULL) { 566 inithdr++; 567 headers(vec); 568 inithdr = 0; 569 } 570 } 571 572 /* 573 * Announce information about the file we are editing. 574 * Return a likely place to set dot. 575 */ 576 int 577 newfileinfo() 578 { 579 struct message *mp; 580 int u, n, mdot, d, s; 581 char fname[PATHSIZE+1], zname[PATHSIZE+1], *ename; 582 583 for (mp = &message[0]; mp < &message[msgCount]; mp++) 584 if (mp->m_flag & MNEW) 585 break; 586 if (mp >= &message[msgCount]) 587 for (mp = &message[0]; mp < &message[msgCount]; mp++) 588 if ((mp->m_flag & MREAD) == 0) 589 break; 590 if (mp < &message[msgCount]) 591 mdot = mp - &message[0] + 1; 592 else 593 mdot = 1; 594 s = d = 0; 595 for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) { 596 if (mp->m_flag & MNEW) 597 n++; 598 if ((mp->m_flag & MREAD) == 0) 599 u++; 600 if (mp->m_flag & MDELETED) 601 d++; 602 if (mp->m_flag & MSAVED) 603 s++; 604 } 605 ename = mailname; 606 if (getfold(fname, sizeof(fname) - 1) >= 0) { 607 strcat(fname, "/"); 608 if (strncmp(fname, mailname, strlen(fname)) == 0) { 609 (void)snprintf(zname, sizeof(zname), "+%s", 610 mailname + strlen(fname)); 611 ename = zname; 612 } 613 } 614 printf("\"%s\": ", ename); 615 if (msgCount == 1) 616 printf("1 message"); 617 else 618 printf("%d messages", msgCount); 619 if (n > 0) 620 printf(" %d new", n); 621 if (u-n > 0) 622 printf(" %d unread", u); 623 if (d > 0) 624 printf(" %d deleted", d); 625 if (s > 0) 626 printf(" %d saved", s); 627 if (readonly) 628 printf(" [Read only]"); 629 printf("\n"); 630 return (mdot); 631 } 632 633 /* 634 * Print the current version number. 635 */ 636 637 /*ARGSUSED*/ 638 int 639 pversion(e) 640 int e; 641 { 642 643 printf("Version %s\n", version); 644 return (0); 645 } 646 647 /* 648 * Load a file of user definitions. 649 */ 650 void 651 load(name) 652 char *name; 653 { 654 FILE *in, *oldin; 655 656 if ((in = Fopen(name, "r")) == NULL) 657 return; 658 oldin = input; 659 input = in; 660 loading = 1; 661 sourcing = 1; 662 commands(); 663 loading = 0; 664 sourcing = 0; 665 input = oldin; 666 (void)Fclose(in); 667 } 668