1 /* $NetBSD: lex.c,v 1.10 1997/05/17 19:55:13 pk 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 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)lex.c 8.2 (Berkeley) 4/20/95"; 39 #else 40 static char rcsid[] = "$NetBSD: lex.c,v 1.10 1997/05/17 19:55:13 pk Exp $"; 41 #endif 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; 69 struct stat stb; 70 char isedit = *name != '%'; 71 char *who = name[1] ? name + 1 : myname; 72 static int shudclob; 73 extern char *tempMesg; 74 extern int errno; 75 76 if ((name = expand(name)) == NOSTR) 77 return -1; 78 79 if ((ibuf = Fopen(name, "r")) == NULL) { 80 if (!isedit && errno == ENOENT) 81 goto nomail; 82 perror(name); 83 return(-1); 84 } 85 86 if (fstat(fileno(ibuf), &stb) < 0) { 87 perror("fstat"); 88 Fclose(ibuf); 89 return (-1); 90 } 91 92 switch (stb.st_mode & S_IFMT) { 93 case S_IFDIR: 94 Fclose(ibuf); 95 errno = EISDIR; 96 perror(name); 97 return (-1); 98 99 case S_IFREG: 100 break; 101 102 default: 103 Fclose(ibuf); 104 errno = EINVAL; 105 perror(name); 106 return (-1); 107 } 108 109 /* 110 * Looks like all will be well. We must now relinquish our 111 * hold on the current set of stuff. Must hold signals 112 * while we are reading the new file, else we will ruin 113 * the message[] data structure. 114 */ 115 116 holdsigs(); 117 if (shudclob) 118 quit(); 119 120 /* 121 * Copy the messages into /tmp 122 * and set pointers. 123 */ 124 125 readonly = 0; 126 if ((i = open(name, 1)) < 0) 127 readonly++; 128 else 129 close(i); 130 if (shudclob) { 131 fclose(itf); 132 fclose(otf); 133 } 134 shudclob = 1; 135 edit = isedit; 136 strcpy(prevfile, mailname); 137 if (name != mailname) 138 strcpy(mailname, name); 139 mailsize = fsize(ibuf); 140 if ((otf = fopen(tempMesg, "w")) == NULL) { 141 perror(tempMesg); 142 exit(1); 143 } 144 (void) fcntl(fileno(otf), F_SETFD, 1); 145 if ((itf = fopen(tempMesg, "r")) == NULL) { 146 perror(tempMesg); 147 exit(1); 148 } 149 (void) fcntl(fileno(itf), F_SETFD, 1); 150 rm(tempMesg); 151 setptr(ibuf, 0); 152 setmsize(msgCount); 153 /* 154 * New mail may have arrived while we were reading 155 * the mail file, so reset mailsize to be where 156 * we really are in the file... 157 */ 158 mailsize = ftell(ibuf); 159 Fclose(ibuf); 160 relsesigs(); 161 sawcom = 0; 162 if (!edit && msgCount == 0) { 163 nomail: 164 fprintf(stderr, "No mail for %s\n", who); 165 return -1; 166 } 167 return(0); 168 } 169 170 /* 171 * Incorporate any new mail that has arrived since we first 172 * started reading mail. 173 */ 174 int 175 incfile() 176 { 177 int newsize; 178 int omsgCount = msgCount; 179 FILE *ibuf; 180 181 ibuf = Fopen(mailname, "r"); 182 if (ibuf == NULL) 183 return -1; 184 holdsigs(); 185 newsize = fsize(ibuf); 186 if (newsize == 0) 187 return -1; /* mail box is now empty??? */ 188 if (newsize < mailsize) 189 return -1; /* mail box has shrunk??? */ 190 if (newsize == mailsize) 191 return 0; /* no new mail */ 192 setptr(ibuf, mailsize); 193 setmsize(msgCount); 194 mailsize = ftell(ibuf); 195 Fclose(ibuf); 196 relsesigs(); 197 return(msgCount - omsgCount); 198 } 199 200 int *msgvec; 201 int reset_on_stop; /* do a reset() if stopped */ 202 203 /* 204 * Interpret user commands one by one. If standard input is not a tty, 205 * print no prompt. 206 */ 207 void 208 commands() 209 { 210 int eofloop = 0; 211 register int n; 212 char linebuf[LINESIZE]; 213 #if __GNUC__ 214 /* Avoid longjmp clobbering */ 215 (void) &eofloop; 216 #endif 217 218 if (!sourcing) { 219 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 220 signal(SIGINT, intr); 221 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 222 signal(SIGHUP, hangup); 223 signal(SIGTSTP, stop); 224 signal(SIGTTOU, stop); 225 signal(SIGTTIN, stop); 226 } 227 setexit(); 228 for (;;) { 229 /* 230 * Print the prompt, if needed. Clear out 231 * string space, and flush the output. 232 */ 233 if (!sourcing && value("interactive") != NOSTR) { 234 if ((value("autoinc") != NOSTR) && (incfile() > 0)) 235 printf("New mail has arrived.\n"); 236 reset_on_stop = 1; 237 printf(prompt); 238 } 239 fflush(stdout); 240 sreset(); 241 /* 242 * Read a line of commands from the current input 243 * and handle end of file specially. 244 */ 245 n = 0; 246 for (;;) { 247 if (readline(input, &linebuf[n], LINESIZE - n) < 0) { 248 if (n == 0) 249 n = -1; 250 break; 251 } 252 if ((n = strlen(linebuf)) == 0) 253 break; 254 n--; 255 if (linebuf[n] != '\\') 256 break; 257 linebuf[n++] = ' '; 258 } 259 reset_on_stop = 0; 260 if (n < 0) { 261 /* eof */ 262 if (loading) 263 break; 264 if (sourcing) { 265 unstack(); 266 continue; 267 } 268 if (value("interactive") != NOSTR && 269 value("ignoreeof") != NOSTR && 270 ++eofloop < 25) { 271 printf("Use \"quit\" to quit.\n"); 272 continue; 273 } 274 break; 275 } 276 eofloop = 0; 277 if (execute(linebuf, 0)) 278 break; 279 } 280 } 281 282 /* 283 * Execute a single command. 284 * Command functions return 0 for success, 1 for error, and -1 285 * for abort. A 1 or -1 aborts a load or source. A -1 aborts 286 * the interactive command loop. 287 * Contxt is non-zero if called while composing mail. 288 */ 289 int 290 execute(linebuf, contxt) 291 char linebuf[]; 292 int contxt; 293 { 294 char word[LINESIZE]; 295 char *arglist[MAXARGC]; 296 const struct cmd *com = NULL; 297 register char *cp, *cp2; 298 register int c; 299 int muvec[2]; 300 int e = 1; 301 302 /* 303 * Strip the white space away from the beginning 304 * of the command, then scan out a word, which 305 * consists of anything except digits and white space. 306 * 307 * Handle ! escapes differently to get the correct 308 * lexical conventions. 309 */ 310 311 for (cp = linebuf; isspace(*cp); cp++) 312 ; 313 if (*cp == '!') { 314 if (sourcing) { 315 printf("Can't \"!\" while sourcing\n"); 316 goto out; 317 } 318 shell(cp+1); 319 return(0); 320 } 321 cp2 = word; 322 while (*cp && index(" \t0123456789$^.:/-+*'\"", *cp) == NOSTR) 323 *cp2++ = *cp++; 324 *cp2 = '\0'; 325 326 /* 327 * Look up the command; if not found, bitch. 328 * Normally, a blank command would map to the 329 * first command in the table; while sourcing, 330 * however, we ignore blank lines to eliminate 331 * confusion. 332 */ 333 334 if (sourcing && *word == '\0') 335 return(0); 336 com = lex(word); 337 if (com == NONE) { 338 printf("Unknown command: \"%s\"\n", word); 339 goto out; 340 } 341 342 /* 343 * See if we should execute the command -- if a conditional 344 * we always execute it, otherwise, check the state of cond. 345 */ 346 347 if ((com->c_argtype & F) == 0) 348 if ((cond == CRCV && !rcvmode) || (cond == CSEND && rcvmode)) 349 return(0); 350 351 /* 352 * Process the arguments to the command, depending 353 * on the type he expects. Default to an error. 354 * If we are sourcing an interactive command, it's 355 * an error. 356 */ 357 358 if (!rcvmode && (com->c_argtype & M) == 0) { 359 printf("May not execute \"%s\" while sending\n", 360 com->c_name); 361 goto out; 362 } 363 if (sourcing && com->c_argtype & I) { 364 printf("May not execute \"%s\" while sourcing\n", 365 com->c_name); 366 goto out; 367 } 368 if (readonly && com->c_argtype & W) { 369 printf("May not execute \"%s\" -- message file is read only\n", 370 com->c_name); 371 goto out; 372 } 373 if (contxt && com->c_argtype & R) { 374 printf("Cannot recursively invoke \"%s\"\n", com->c_name); 375 goto out; 376 } 377 switch (com->c_argtype & ~(F|P|I|M|T|W|R)) { 378 case MSGLIST: 379 /* 380 * A message list defaulting to nearest forward 381 * legal message. 382 */ 383 if (msgvec == 0) { 384 printf("Illegal use of \"message list\"\n"); 385 break; 386 } 387 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) 388 break; 389 if (c == 0) { 390 *msgvec = first(com->c_msgflag, 391 com->c_msgmask); 392 msgvec[1] = 0; 393 } 394 if (*msgvec == 0) { 395 printf("No applicable messages\n"); 396 break; 397 } 398 e = (*com->c_func)(msgvec); 399 break; 400 401 case NDMLIST: 402 /* 403 * A message list with no defaults, but no error 404 * if none exist. 405 */ 406 if (msgvec == 0) { 407 printf("Illegal use of \"message list\"\n"); 408 break; 409 } 410 if (getmsglist(cp, msgvec, com->c_msgflag) < 0) 411 break; 412 e = (*com->c_func)(msgvec); 413 break; 414 415 case STRLIST: 416 /* 417 * Just the straight string, with 418 * leading blanks removed. 419 */ 420 while (isspace(*cp)) 421 cp++; 422 e = (*com->c_func)(cp); 423 break; 424 425 case RAWLIST: 426 /* 427 * A vector of strings, in shell style. 428 */ 429 if ((c = getrawlist(cp, arglist, 430 sizeof arglist / sizeof *arglist)) < 0) 431 break; 432 if (c < com->c_minargs) { 433 printf("%s requires at least %d arg(s)\n", 434 com->c_name, com->c_minargs); 435 break; 436 } 437 if (c > com->c_maxargs) { 438 printf("%s takes no more than %d arg(s)\n", 439 com->c_name, com->c_maxargs); 440 break; 441 } 442 e = (*com->c_func)(arglist); 443 break; 444 445 case NOLIST: 446 /* 447 * Just the constant zero, for exiting, 448 * eg. 449 */ 450 e = (*com->c_func)(0); 451 break; 452 453 default: 454 panic("Unknown argtype"); 455 } 456 457 out: 458 /* 459 * Exit the current source file on 460 * error. 461 */ 462 if (e) { 463 if (e < 0) 464 return 1; 465 if (loading) 466 return 1; 467 if (sourcing) 468 unstack(); 469 return 0; 470 } 471 if (com == NULL) 472 return(0); 473 if (value("autoprint") != NOSTR && com->c_argtype & P) 474 if ((dot->m_flag & MDELETED) == 0) { 475 muvec[0] = dot - &message[0] + 1; 476 muvec[1] = 0; 477 type(muvec); 478 } 479 if (!sourcing && (com->c_argtype & T) == 0) 480 sawcom = 1; 481 return(0); 482 } 483 484 /* 485 * Set the size of the message vector used to construct argument 486 * lists to message list functions. 487 */ 488 void 489 setmsize(sz) 490 int sz; 491 { 492 493 if (msgvec != 0) 494 free((char *) msgvec); 495 msgvec = (int *) calloc((unsigned) (sz + 1), sizeof *msgvec); 496 } 497 498 /* 499 * Find the correct command in the command table corresponding 500 * to the passed command "word" 501 */ 502 503 const struct cmd * 504 lex(word) 505 char word[]; 506 { 507 extern const struct cmd cmdtab[]; 508 register const struct cmd *cp; 509 510 for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++) 511 if (isprefix(word, cp->c_name)) 512 return(cp); 513 return(NONE); 514 } 515 516 /* 517 * Determine if as1 is a valid prefix of as2. 518 * Return true if yep. 519 */ 520 int 521 isprefix(as1, as2) 522 char *as1, *as2; 523 { 524 register char *s1, *s2; 525 526 s1 = as1; 527 s2 = as2; 528 while (*s1++ == *s2) 529 if (*s2++ == '\0') 530 return(1); 531 return(*--s1 == '\0'); 532 } 533 534 /* 535 * The following gets called on receipt of an interrupt. This is 536 * to abort printout of a command, mainly. 537 * Dispatching here when command() is inactive crashes rcv. 538 * Close all open files except 0, 1, 2, and the temporary. 539 * Also, unstack all source files. 540 */ 541 542 int inithdr; /* am printing startup headers */ 543 544 /*ARGSUSED*/ 545 void 546 intr(s) 547 int s; 548 { 549 550 noreset = 0; 551 if (!inithdr) 552 sawcom++; 553 inithdr = 0; 554 while (sourcing) 555 unstack(); 556 557 close_all_files(); 558 559 if (image >= 0) { 560 close(image); 561 image = -1; 562 } 563 fprintf(stderr, "Interrupt\n"); 564 reset(0); 565 } 566 567 /* 568 * When we wake up after ^Z, reprint the prompt. 569 */ 570 void 571 stop(s) 572 int s; 573 { 574 sig_t old_action = signal(s, SIG_DFL); 575 sigset_t nset; 576 577 sigemptyset(&nset); 578 sigaddset(&nset, s); 579 sigprocmask(SIG_UNBLOCK, &nset, NULL); 580 kill(0, s); 581 sigprocmask(SIG_BLOCK, &nset, NULL); 582 signal(s, old_action); 583 if (reset_on_stop) { 584 reset_on_stop = 0; 585 reset(0); 586 } 587 } 588 589 /* 590 * Branch here on hangup signal and simulate "exit". 591 */ 592 /*ARGSUSED*/ 593 void 594 hangup(s) 595 int s; 596 { 597 598 /* nothing to do? */ 599 exit(1); 600 } 601 602 /* 603 * Announce the presence of the current Mail version, 604 * give the message count, and print a header listing. 605 */ 606 void 607 announce() 608 { 609 int vec[2], mdot; 610 611 mdot = newfileinfo(0); 612 vec[0] = mdot; 613 vec[1] = 0; 614 dot = &message[mdot - 1]; 615 if (msgCount > 0 && value("noheader") == NOSTR) { 616 inithdr++; 617 headers(vec); 618 inithdr = 0; 619 } 620 } 621 622 /* 623 * Announce information about the file we are editing. 624 * Return a likely place to set dot. 625 */ 626 int 627 newfileinfo(omsgCount) 628 int omsgCount; 629 { 630 register struct message *mp; 631 register int u, n, mdot, d, s, l; 632 char fname[PATHSIZE], zname[PATHSIZE], *ename; 633 634 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++) 635 if (mp->m_flag & MNEW) 636 break; 637 if (mp >= &message[msgCount]) 638 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++) 639 if ((mp->m_flag & MREAD) == 0) 640 break; 641 if (mp < &message[msgCount]) 642 mdot = mp - &message[0] + 1; 643 else 644 mdot = omsgCount + 1; 645 s = d = 0; 646 for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) { 647 if (mp->m_flag & MNEW) 648 n++; 649 if ((mp->m_flag & MREAD) == 0) 650 u++; 651 if (mp->m_flag & MDELETED) 652 d++; 653 if (mp->m_flag & MSAVED) 654 s++; 655 } 656 ename = mailname; 657 if (getfold(fname) >= 0) { 658 l = strlen(fname); 659 if (l < PATHSIZE - 1) 660 fname[l++] = '/'; 661 if (strncmp(fname, mailname, l) == 0) { 662 snprintf(zname, PATHSIZE, "+%s", 663 mailname + l); 664 ename = zname; 665 } 666 } 667 printf("\"%s\": ", ename); 668 if (msgCount == 1) 669 printf("1 message"); 670 else 671 printf("%d messages", msgCount); 672 if (n > 0) 673 printf(" %d new", n); 674 if (u-n > 0) 675 printf(" %d unread", u); 676 if (d > 0) 677 printf(" %d deleted", d); 678 if (s > 0) 679 printf(" %d saved", s); 680 if (readonly) 681 printf(" [Read only]"); 682 printf("\n"); 683 return(mdot); 684 } 685 686 /* 687 * Print the current version number. 688 */ 689 690 /*ARGSUSED*/ 691 int 692 pversion(v) 693 void *v; 694 { 695 extern char *version; 696 697 printf("Version %s\n", version); 698 return(0); 699 } 700 701 /* 702 * Load a file of user definitions. 703 */ 704 void 705 load(name) 706 char *name; 707 { 708 register FILE *in, *oldin; 709 710 if ((in = Fopen(name, "r")) == NULL) 711 return; 712 oldin = input; 713 input = in; 714 loading = 1; 715 sourcing = 1; 716 commands(); 717 loading = 0; 718 sourcing = 0; 719 input = oldin; 720 Fclose(in); 721 } 722