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 char *prompt = "& "; 56 57 /* 58 * Set up editing on the given file name. 59 * If the first character of name is %, we are considered to be 60 * editing the file, otherwise we are reading our mail which has 61 * signficance for mbox and so forth. 62 */ 63 int 64 setfile(name) 65 char *name; 66 { 67 FILE *ibuf; 68 int i, fd; 69 struct stat stb; 70 char isedit = *name != '%'; 71 char *who = name[1] ? name + 1 : myname; 72 char tempname[PATHSIZE]; 73 static int shudclob; 74 75 if ((name = expand(name)) == NOSTR) 76 return -1; 77 78 if ((ibuf = Fopen(name, "r")) == NULL) { 79 if (!isedit && errno == ENOENT) 80 goto nomail; 81 warn("%s", name); 82 return(-1); 83 } 84 85 if (fstat(fileno(ibuf), &stb) < 0) { 86 warn("fstat"); 87 Fclose(ibuf); 88 return (-1); 89 } 90 91 if (S_ISDIR(stb.st_mode) || !S_ISREG(stb.st_mode)) { 92 Fclose(ibuf); 93 errno = S_ISDIR(stb.st_mode) ? EISDIR : EINVAL; 94 warn("%s", name); 95 return (-1); 96 } 97 98 /* 99 * Looks like all will be well. We must now relinquish our 100 * hold on the current set of stuff. Must hold signals 101 * while we are reading the new file, else we will ruin 102 * the message[] data structure. 103 */ 104 105 holdsigs(); 106 if (shudclob) 107 quit(); 108 109 /* 110 * Copy the messages into /tmp 111 * and set pointers. 112 */ 113 114 readonly = 0; 115 if ((i = open(name, 1)) < 0) 116 readonly++; 117 else 118 close(i); 119 if (shudclob) { 120 fclose(itf); 121 fclose(otf); 122 } 123 shudclob = 1; 124 edit = isedit; 125 strlcpy(prevfile, mailname, sizeof(prevfile)); 126 if (name != mailname) 127 strlcpy(mailname, name, sizeof(mailname)); 128 mailsize = fsize(ibuf); 129 snprintf(tempname, sizeof(tempname), "%s/mail.RxXXXXXXXXXX", tmpdir); 130 if ((fd = mkstemp(tempname)) == -1 || (otf = fdopen(fd, "w")) == NULL) 131 err(1, "%s", tempname); 132 (void) fcntl(fileno(otf), F_SETFD, 1); 133 if ((itf = fopen(tempname, "r")) == NULL) 134 err(1, "%s", tempname); 135 (void) fcntl(fileno(itf), F_SETFD, 1); 136 rm(tempname); 137 setptr(ibuf); 138 setmsize(msgCount); 139 Fclose(ibuf); 140 relsesigs(); 141 sawcom = 0; 142 if (!edit && msgCount == 0) { 143 nomail: 144 fprintf(stderr, "No mail for %s\n", who); 145 return -1; 146 } 147 return(0); 148 } 149 150 int *msgvec; 151 int reset_on_stop; /* do a reset() if stopped */ 152 153 /* 154 * Interpret user commands one by one. If standard input is not a tty, 155 * print no prompt. 156 */ 157 void 158 commands() 159 { 160 int eofloop = 0; 161 register int n; 162 char linebuf[LINESIZE]; 163 void intr(), stop(), hangup(); 164 165 if (!sourcing) { 166 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 167 signal(SIGINT, intr); 168 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 169 signal(SIGHUP, hangup); 170 signal(SIGTSTP, stop); 171 signal(SIGTTOU, stop); 172 signal(SIGTTIN, stop); 173 } 174 setexit(); 175 for (;;) { 176 /* 177 * Print the prompt, if needed. Clear out 178 * string space, and flush the output. 179 */ 180 if (!sourcing && value("interactive") != NOSTR) { 181 reset_on_stop = 1; 182 printf("%s", prompt); 183 } 184 fflush(stdout); 185 sreset(); 186 /* 187 * Read a line of commands from the current input 188 * and handle end of file specially. 189 */ 190 n = 0; 191 for (;;) { 192 if (readline(input, &linebuf[n], LINESIZE - n) < 0) { 193 if (n == 0) 194 n = -1; 195 break; 196 } 197 if ((n = strlen(linebuf)) == 0) 198 break; 199 n--; 200 if (linebuf[n] != '\\') 201 break; 202 linebuf[n++] = ' '; 203 } 204 reset_on_stop = 0; 205 if (n < 0) { 206 /* eof */ 207 if (loading) 208 break; 209 if (sourcing) { 210 unstack(); 211 continue; 212 } 213 if (value("interactive") != NOSTR && 214 value("ignoreeof") != NOSTR && 215 ++eofloop < 25) { 216 printf("Use \"quit\" to quit.\n"); 217 continue; 218 } 219 break; 220 } 221 eofloop = 0; 222 if (execute(linebuf, 0)) 223 break; 224 } 225 } 226 227 /* 228 * Execute a single command. 229 * Command functions return 0 for success, 1 for error, and -1 230 * for abort. A 1 or -1 aborts a load or source. A -1 aborts 231 * the interactive command loop. 232 * Contxt is non-zero if called while composing mail. 233 */ 234 int 235 execute(linebuf, contxt) 236 char linebuf[]; 237 int contxt; 238 { 239 char word[LINESIZE]; 240 char *arglist[MAXARGC]; 241 struct cmd *com; 242 register char *cp, *cp2; 243 register int c; 244 int muvec[2]; 245 int e = 1; 246 247 /* 248 * Strip the white space away from the beginning 249 * of the command, then scan out a word, which 250 * consists of anything except digits and white space. 251 * 252 * Handle ! escapes differently to get the correct 253 * lexical conventions. 254 */ 255 256 for (cp = linebuf; isspace(*cp); cp++) 257 ; 258 if (*cp == '!') { 259 if (sourcing) { 260 printf("Can't \"!\" while sourcing\n"); 261 goto out; 262 } 263 shell(cp+1); 264 return(0); 265 } 266 cp2 = word; 267 while (*cp && strchr(" \t0123456789$^.:/-+*'\"", *cp) == NOSTR) 268 *cp2++ = *cp++; 269 *cp2 = '\0'; 270 271 /* 272 * Look up the command; if not found, bitch. 273 * Normally, a blank command would map to the 274 * first command in the table; while sourcing, 275 * however, we ignore blank lines to eliminate 276 * confusion. 277 */ 278 279 if (sourcing && *word == '\0') 280 return(0); 281 com = lex(word); 282 if (com == NONE) { 283 printf("Unknown command: \"%s\"\n", word); 284 goto out; 285 } 286 287 /* 288 * See if we should execute the command -- if a conditional 289 * we always execute it, otherwise, check the state of cond. 290 */ 291 292 if ((com->c_argtype & F) == 0) 293 if (cond == CRCV && !rcvmode || cond == CSEND && rcvmode) 294 return(0); 295 296 /* 297 * Process the arguments to the command, depending 298 * on the type he expects. Default to an error. 299 * If we are sourcing an interactive command, it's 300 * an error. 301 */ 302 303 if (!rcvmode && (com->c_argtype & M) == 0) { 304 printf("May not execute \"%s\" while sending\n", 305 com->c_name); 306 goto out; 307 } 308 if (sourcing && com->c_argtype & I) { 309 printf("May not execute \"%s\" while sourcing\n", 310 com->c_name); 311 goto out; 312 } 313 if (readonly && com->c_argtype & W) { 314 printf("May not execute \"%s\" -- message file is read only\n", 315 com->c_name); 316 goto out; 317 } 318 if (contxt && com->c_argtype & R) { 319 printf("Cannot recursively invoke \"%s\"\n", com->c_name); 320 goto out; 321 } 322 switch (com->c_argtype & ~(F|P|I|M|T|W|R)) { 323 case MSGLIST: 324 /* 325 * A message list defaulting to nearest forward 326 * legal message. 327 */ 328 if (msgvec == 0) { 329 printf("Illegal use of \"message list\"\n"); 330 break; 331 } 332 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) 333 break; 334 if (c == 0) { 335 *msgvec = first(com->c_msgflag, 336 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") != NOSTR && 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 free((char *) msgvec); 438 msgvec = (int *) 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 struct cmd * 447 lex(word) 448 char word[]; 449 { 450 register struct cmd *cp; 451 extern struct cmd cmdtab[]; 452 453 /* 454 * ignore trailing chars after `#' 455 * 456 * lines with beginning `#' are comments 457 * spaces before `#' are ignored in execute() 458 */ 459 460 if (*word == '#') 461 *(word+1) = '\0'; 462 463 464 for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++) 465 if (isprefix(word, cp->c_name)) 466 return(cp); 467 return(NONE); 468 } 469 470 /* 471 * Determine if as1 is a valid prefix of as2. 472 * Return true if yep. 473 */ 474 int 475 isprefix(as1, as2) 476 char *as1, *as2; 477 { 478 register char *s1, *s2; 479 480 s1 = as1; 481 s2 = as2; 482 while (*s1++ == *s2) 483 if (*s2++ == '\0') 484 return(1); 485 return(*--s1 == '\0'); 486 } 487 488 /* 489 * The following gets called on receipt of an interrupt. This is 490 * to abort printout of a command, mainly. 491 * Dispatching here when command() is inactive crashes rcv. 492 * Close all open files except 0, 1, 2, and the temporary. 493 * Also, unstack all source files. 494 */ 495 496 int inithdr; /* am printing startup headers */ 497 498 /*ARGSUSED*/ 499 void 500 intr(s) 501 int s; 502 { 503 504 noreset = 0; 505 if (!inithdr) 506 sawcom++; 507 inithdr = 0; 508 while (sourcing) 509 unstack(); 510 511 close_all_files(); 512 513 if (image >= 0) { 514 close(image); 515 image = -1; 516 } 517 fprintf(stderr, "Interrupt\n"); 518 reset(0); 519 } 520 521 /* 522 * When we wake up after ^Z, reprint the prompt. 523 */ 524 void 525 stop(s) 526 int s; 527 { 528 sig_t old_action = signal(s, SIG_DFL); 529 530 sigsetmask(sigblock(0) & ~sigmask(s)); 531 kill(0, s); 532 sigblock(sigmask(s)); 533 signal(s, old_action); 534 if (reset_on_stop) { 535 reset_on_stop = 0; 536 reset(0); 537 } 538 } 539 540 /* 541 * Branch here on hangup signal and simulate "exit". 542 */ 543 /*ARGSUSED*/ 544 void 545 hangup(s) 546 int s; 547 { 548 549 /* nothing to do? */ 550 exit(1); 551 } 552 553 /* 554 * Announce the presence of the current Mail version, 555 * give the message count, and print a header listing. 556 */ 557 void 558 announce() 559 { 560 int vec[2], mdot; 561 562 mdot = newfileinfo(); 563 vec[0] = mdot; 564 vec[1] = 0; 565 dot = &message[mdot - 1]; 566 if (msgCount > 0 && value("noheader") == NOSTR) { 567 inithdr++; 568 headers(vec); 569 inithdr = 0; 570 } 571 } 572 573 /* 574 * Announce information about the file we are editing. 575 * Return a likely place to set dot. 576 */ 577 int 578 newfileinfo() 579 { 580 register struct message *mp; 581 register int u, n, mdot, d, s; 582 char fname[PATHSIZE+1], zname[PATHSIZE+1], *ename; 583 584 for (mp = &message[0]; mp < &message[msgCount]; mp++) 585 if (mp->m_flag & MNEW) 586 break; 587 if (mp >= &message[msgCount]) 588 for (mp = &message[0]; mp < &message[msgCount]; mp++) 589 if ((mp->m_flag & MREAD) == 0) 590 break; 591 if (mp < &message[msgCount]) 592 mdot = mp - &message[0] + 1; 593 else 594 mdot = 1; 595 s = d = 0; 596 for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) { 597 if (mp->m_flag & MNEW) 598 n++; 599 if ((mp->m_flag & MREAD) == 0) 600 u++; 601 if (mp->m_flag & MDELETED) 602 d++; 603 if (mp->m_flag & MSAVED) 604 s++; 605 } 606 ename = mailname; 607 if (getfold(fname, sizeof(fname) - 1) >= 0) { 608 strcat(fname, "/"); 609 if (strncmp(fname, mailname, strlen(fname)) == 0) { 610 snprintf(zname, sizeof(zname), "+%s", 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 extern char *version; 643 644 printf("Version %s\n", version); 645 return(0); 646 } 647 648 /* 649 * Load a file of user definitions. 650 */ 651 void 652 load(name) 653 char *name; 654 { 655 register FILE *in, *oldin; 656 657 if ((in = Fopen(name, "r")) == NULL) 658 return; 659 oldin = input; 660 input = in; 661 loading = 1; 662 sourcing = 1; 663 commands(); 664 loading = 0; 665 sourcing = 0; 666 input = oldin; 667 Fclose(in); 668 } 669