1 /* $NetBSD: lex.c,v 1.16 2001/02/05 02:07:53 christos 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[] = "@(#)lex.c 8.2 (Berkeley) 4/20/95"; 40 #else 41 __RCSID("$NetBSD: lex.c,v 1.16 2001/02/05 02:07:53 christos Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include "rcv.h" 46 #include "extern.h" 47 48 /* 49 * Mail -- a mail program 50 * 51 * Lexical processing of commands. 52 */ 53 54 extern char *version; 55 extern const struct cmd cmdtab[]; 56 extern char *tempMesg; 57 58 char *prompt = "& "; 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; 72 struct stat stb; 73 char isedit = *name != '%' || getuserid(myname) != getuid(); 74 char *who = name[1] ? name + 1 : myname; 75 static int shudclob; 76 77 if ((name = expand(name)) == NOSTR) 78 return -1; 79 80 if ((ibuf = Fopen(name, "r")) == NULL) { 81 if (!isedit && errno == ENOENT) 82 goto nomail; 83 perror(name); 84 return(-1); 85 } 86 87 if (fstat(fileno(ibuf), &stb) < 0) { 88 perror("fstat"); 89 Fclose(ibuf); 90 return (-1); 91 } 92 93 switch (stb.st_mode & S_IFMT) { 94 case S_IFDIR: 95 Fclose(ibuf); 96 errno = EISDIR; 97 perror(name); 98 return (-1); 99 100 case S_IFREG: 101 break; 102 103 default: 104 Fclose(ibuf); 105 errno = EINVAL; 106 perror(name); 107 return (-1); 108 } 109 110 /* 111 * Looks like all will be well. We must now relinquish our 112 * hold on the current set of stuff. Must hold signals 113 * while we are reading the new file, else we will ruin 114 * the message[] data structure. 115 */ 116 117 holdsigs(); 118 if (shudclob) 119 quit(); 120 121 /* 122 * Copy the messages into /tmp 123 * and set pointers. 124 */ 125 126 readonly = 0; 127 if ((i = open(name, 1)) < 0) 128 readonly++; 129 else 130 close(i); 131 if (shudclob) { 132 fclose(itf); 133 fclose(otf); 134 } 135 shudclob = 1; 136 edit = isedit; 137 strcpy(prevfile, mailname); 138 if (name != mailname) 139 strcpy(mailname, name); 140 mailsize = fsize(ibuf); 141 if ((otf = fopen(tempMesg, "w")) == NULL) { 142 perror(tempMesg); 143 exit(1); 144 } 145 (void) fcntl(fileno(otf), F_SETFD, 1); 146 if ((itf = fopen(tempMesg, "r")) == NULL) { 147 perror(tempMesg); 148 exit(1); 149 } 150 (void) fcntl(fileno(itf), F_SETFD, 1); 151 rm(tempMesg); 152 setptr(ibuf, 0); 153 setmsize(msgCount); 154 /* 155 * New mail may have arrived while we were reading 156 * the mail file, so reset mailsize to be where 157 * we really are in the file... 158 */ 159 mailsize = ftell(ibuf); 160 Fclose(ibuf); 161 relsesigs(); 162 sawcom = 0; 163 if (!edit && msgCount == 0) { 164 nomail: 165 fprintf(stderr, "No mail for %s\n", who); 166 return -1; 167 } 168 return(0); 169 } 170 171 /* 172 * Incorporate any new mail that has arrived since we first 173 * started reading mail. 174 */ 175 int 176 incfile() 177 { 178 int newsize; 179 int omsgCount = msgCount; 180 FILE *ibuf; 181 182 ibuf = Fopen(mailname, "r"); 183 if (ibuf == NULL) 184 return -1; 185 holdsigs(); 186 newsize = fsize(ibuf); 187 if (newsize == 0) 188 return -1; /* mail box is now empty??? */ 189 if (newsize < mailsize) 190 return -1; /* mail box has shrunk??? */ 191 if (newsize == mailsize) 192 return 0; /* no new mail */ 193 setptr(ibuf, mailsize); 194 setmsize(msgCount); 195 mailsize = ftell(ibuf); 196 Fclose(ibuf); 197 relsesigs(); 198 return(msgCount - omsgCount); 199 } 200 201 int *msgvec; 202 int reset_on_stop; /* do a reset() if stopped */ 203 204 /* 205 * Interpret user commands one by one. If standard input is not a tty, 206 * print no prompt. 207 */ 208 void 209 commands() 210 { 211 int eofloop = 0; 212 int n; 213 char linebuf[LINESIZE]; 214 #if __GNUC__ 215 /* Avoid longjmp clobbering */ 216 (void) &eofloop; 217 #endif 218 219 if (!sourcing) { 220 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 221 signal(SIGINT, intr); 222 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 223 signal(SIGHUP, hangup); 224 signal(SIGTSTP, stop); 225 signal(SIGTTOU, stop); 226 signal(SIGTTIN, stop); 227 } 228 setexit(); 229 for (;;) { 230 /* 231 * Print the prompt, if needed. Clear out 232 * string space, and flush the output. 233 */ 234 if (!sourcing && value("interactive") != NOSTR) { 235 if ((value("autoinc") != NOSTR) && (incfile() > 0)) 236 printf("New mail has arrived.\n"); 237 reset_on_stop = 1; 238 printf("%s", prompt); 239 } 240 fflush(stdout); 241 sreset(); 242 /* 243 * Read a line of commands from the current input 244 * and handle end of file specially. 245 */ 246 n = 0; 247 for (;;) { 248 if (readline(input, &linebuf[n], LINESIZE - n) < 0) { 249 if (n == 0) 250 n = -1; 251 break; 252 } 253 if ((n = strlen(linebuf)) == 0) 254 break; 255 n--; 256 if (linebuf[n] != '\\') 257 break; 258 linebuf[n++] = ' '; 259 } 260 reset_on_stop = 0; 261 if (n < 0) { 262 /* eof */ 263 if (loading) 264 break; 265 if (sourcing) { 266 unstack(); 267 continue; 268 } 269 if (value("interactive") != NOSTR && 270 value("ignoreeof") != NOSTR && 271 ++eofloop < 25) { 272 printf("Use \"quit\" to quit.\n"); 273 continue; 274 } 275 break; 276 } 277 eofloop = 0; 278 if (execute(linebuf, 0)) 279 break; 280 } 281 } 282 283 /* 284 * Execute a single command. 285 * Command functions return 0 for success, 1 for error, and -1 286 * for abort. A 1 or -1 aborts a load or source. A -1 aborts 287 * the interactive command loop. 288 * Contxt is non-zero if called while composing mail. 289 */ 290 int 291 execute(linebuf, contxt) 292 char linebuf[]; 293 int contxt; 294 { 295 char word[LINESIZE]; 296 char *arglist[MAXARGC]; 297 const struct cmd *com = NULL; 298 char *cp, *cp2; 299 int c; 300 int muvec[2]; 301 int e = 1; 302 303 /* 304 * Strip the white space away from the beginning 305 * of the command, then scan out a word, which 306 * consists of anything except digits and white space. 307 * 308 * Handle ! escapes differently to get the correct 309 * lexical conventions. 310 */ 311 312 for (cp = linebuf; isspace((unsigned char)*cp); cp++) 313 ; 314 if (*cp == '!') { 315 if (sourcing) { 316 printf("Can't \"!\" while sourcing\n"); 317 goto out; 318 } 319 shell(cp+1); 320 return(0); 321 } 322 cp2 = word; 323 while (*cp && strchr(" \t0123456789$^.:/-+*'\"", *cp) == NOSTR) 324 *cp2++ = *cp++; 325 *cp2 = '\0'; 326 327 /* 328 * Look up the command; if not found, bitch. 329 * Normally, a blank command would map to the 330 * first command in the table; while sourcing, 331 * however, we ignore blank lines to eliminate 332 * confusion. 333 */ 334 335 if (sourcing && *word == '\0') 336 return(0); 337 com = lex(word); 338 if (com == NONE) { 339 printf("Unknown command: \"%s\"\n", word); 340 goto out; 341 } 342 343 /* 344 * See if we should execute the command -- if a conditional 345 * we always execute it, otherwise, check the state of cond. 346 */ 347 348 if ((com->c_argtype & F) == 0) 349 if ((cond == CRCV && !rcvmode) || (cond == CSEND && rcvmode)) 350 return(0); 351 352 /* 353 * Process the arguments to the command, depending 354 * on the type he expects. Default to an error. 355 * If we are sourcing an interactive command, it's 356 * an error. 357 */ 358 359 if (!rcvmode && (com->c_argtype & M) == 0) { 360 printf("May not execute \"%s\" while sending\n", 361 com->c_name); 362 goto out; 363 } 364 if (sourcing && com->c_argtype & I) { 365 printf("May not execute \"%s\" while sourcing\n", 366 com->c_name); 367 goto out; 368 } 369 if (readonly && com->c_argtype & W) { 370 printf("May not execute \"%s\" -- message file is read only\n", 371 com->c_name); 372 goto out; 373 } 374 if (contxt && com->c_argtype & R) { 375 printf("Cannot recursively invoke \"%s\"\n", com->c_name); 376 goto out; 377 } 378 switch (com->c_argtype & ~(F|P|I|M|T|W|R)) { 379 case MSGLIST: 380 /* 381 * A message list defaulting to nearest forward 382 * legal message. 383 */ 384 if (msgvec == 0) { 385 printf("Illegal use of \"message list\"\n"); 386 break; 387 } 388 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) 389 break; 390 if (c == 0) { 391 *msgvec = first(com->c_msgflag, 392 com->c_msgmask); 393 msgvec[1] = 0; 394 } 395 if (*msgvec == 0) { 396 printf("No applicable messages\n"); 397 break; 398 } 399 e = (*com->c_func)(msgvec); 400 break; 401 402 case NDMLIST: 403 /* 404 * A message list with no defaults, but no error 405 * if none exist. 406 */ 407 if (msgvec == 0) { 408 printf("Illegal use of \"message list\"\n"); 409 break; 410 } 411 if (getmsglist(cp, msgvec, com->c_msgflag) < 0) 412 break; 413 e = (*com->c_func)(msgvec); 414 break; 415 416 case STRLIST: 417 /* 418 * Just the straight string, with 419 * leading blanks removed. 420 */ 421 while (isspace((unsigned char)*cp)) 422 cp++; 423 e = (*com->c_func)(cp); 424 break; 425 426 case RAWLIST: 427 /* 428 * A vector of strings, in shell style. 429 */ 430 if ((c = getrawlist(cp, arglist, 431 sizeof arglist / sizeof *arglist)) < 0) 432 break; 433 if (c < com->c_minargs) { 434 printf("%s requires at least %d arg(s)\n", 435 com->c_name, com->c_minargs); 436 break; 437 } 438 if (c > com->c_maxargs) { 439 printf("%s takes no more than %d arg(s)\n", 440 com->c_name, com->c_maxargs); 441 break; 442 } 443 e = (*com->c_func)(arglist); 444 break; 445 446 case NOLIST: 447 /* 448 * Just the constant zero, for exiting, 449 * eg. 450 */ 451 e = (*com->c_func)(0); 452 break; 453 454 default: 455 errx(1, "Unknown argtype"); 456 } 457 458 out: 459 /* 460 * Exit the current source file on 461 * error. 462 */ 463 if (e) { 464 if (e < 0) 465 return 1; 466 if (loading) 467 return 1; 468 if (sourcing) 469 unstack(); 470 return 0; 471 } 472 if (com == NULL) 473 return(0); 474 if (value("autoprint") != NOSTR && com->c_argtype & P) 475 if ((dot->m_flag & MDELETED) == 0) { 476 muvec[0] = dot - &message[0] + 1; 477 muvec[1] = 0; 478 type(muvec); 479 } 480 if (!sourcing && (com->c_argtype & T) == 0) 481 sawcom = 1; 482 return(0); 483 } 484 485 /* 486 * Set the size of the message vector used to construct argument 487 * lists to message list functions. 488 */ 489 void 490 setmsize(sz) 491 int sz; 492 { 493 494 if (msgvec != 0) 495 free((char *) msgvec); 496 msgvec = (int *) calloc((unsigned) (sz + 1), sizeof *msgvec); 497 } 498 499 /* 500 * Find the correct command in the command table corresponding 501 * to the passed command "word" 502 */ 503 504 const struct cmd * 505 lex(word) 506 char word[]; 507 { 508 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 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 struct message *mp; 631 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 printf("Version %s\n", version); 696 return(0); 697 } 698 699 /* 700 * Load a file of user definitions. 701 */ 702 void 703 load(name) 704 char *name; 705 { 706 FILE *in, *oldin; 707 708 if ((in = Fopen(name, "r")) == NULL) 709 return; 710 oldin = input; 711 input = in; 712 loading = 1; 713 sourcing = 1; 714 commands(); 715 loading = 0; 716 sourcing = 0; 717 input = oldin; 718 Fclose(in); 719 } 720