1 /* $NetBSD: lex.c,v 1.14 2000/01/21 17:08:35 mycroft 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 1.14 2000/01/21 17:08:35 mycroft 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 char *prompt = "& "; 55 56 /* 57 * Set up editing on the given file name. 58 * If the first character of name is %, we are considered to be 59 * editing the file, otherwise we are reading our mail which has 60 * signficance for mbox and so forth. 61 */ 62 int 63 setfile(name) 64 char *name; 65 { 66 FILE *ibuf; 67 int i; 68 struct stat stb; 69 char isedit = *name != '%' || getuserid(myname) != getuid(); 70 char *who = name[1] ? name + 1 : myname; 71 static int shudclob; 72 extern char *tempMesg; 73 74 if ((name = expand(name)) == NOSTR) 75 return -1; 76 77 if ((ibuf = Fopen(name, "r")) == NULL) { 78 if (!isedit && errno == ENOENT) 79 goto nomail; 80 perror(name); 81 return(-1); 82 } 83 84 if (fstat(fileno(ibuf), &stb) < 0) { 85 perror("fstat"); 86 Fclose(ibuf); 87 return (-1); 88 } 89 90 switch (stb.st_mode & S_IFMT) { 91 case S_IFDIR: 92 Fclose(ibuf); 93 errno = EISDIR; 94 perror(name); 95 return (-1); 96 97 case S_IFREG: 98 break; 99 100 default: 101 Fclose(ibuf); 102 errno = EINVAL; 103 perror(name); 104 return (-1); 105 } 106 107 /* 108 * Looks like all will be well. We must now relinquish our 109 * hold on the current set of stuff. Must hold signals 110 * while we are reading the new file, else we will ruin 111 * the message[] data structure. 112 */ 113 114 holdsigs(); 115 if (shudclob) 116 quit(); 117 118 /* 119 * Copy the messages into /tmp 120 * and set pointers. 121 */ 122 123 readonly = 0; 124 if ((i = open(name, 1)) < 0) 125 readonly++; 126 else 127 close(i); 128 if (shudclob) { 129 fclose(itf); 130 fclose(otf); 131 } 132 shudclob = 1; 133 edit = isedit; 134 strcpy(prevfile, mailname); 135 if (name != mailname) 136 strcpy(mailname, name); 137 mailsize = fsize(ibuf); 138 if ((otf = fopen(tempMesg, "w")) == NULL) { 139 perror(tempMesg); 140 exit(1); 141 } 142 (void) fcntl(fileno(otf), F_SETFD, 1); 143 if ((itf = fopen(tempMesg, "r")) == NULL) { 144 perror(tempMesg); 145 exit(1); 146 } 147 (void) fcntl(fileno(itf), F_SETFD, 1); 148 rm(tempMesg); 149 setptr(ibuf, 0); 150 setmsize(msgCount); 151 /* 152 * New mail may have arrived while we were reading 153 * the mail file, so reset mailsize to be where 154 * we really are in the file... 155 */ 156 mailsize = ftell(ibuf); 157 Fclose(ibuf); 158 relsesigs(); 159 sawcom = 0; 160 if (!edit && msgCount == 0) { 161 nomail: 162 fprintf(stderr, "No mail for %s\n", who); 163 return -1; 164 } 165 return(0); 166 } 167 168 /* 169 * Incorporate any new mail that has arrived since we first 170 * started reading mail. 171 */ 172 int 173 incfile() 174 { 175 int newsize; 176 int omsgCount = msgCount; 177 FILE *ibuf; 178 179 ibuf = Fopen(mailname, "r"); 180 if (ibuf == NULL) 181 return -1; 182 holdsigs(); 183 newsize = fsize(ibuf); 184 if (newsize == 0) 185 return -1; /* mail box is now empty??? */ 186 if (newsize < mailsize) 187 return -1; /* mail box has shrunk??? */ 188 if (newsize == mailsize) 189 return 0; /* no new mail */ 190 setptr(ibuf, mailsize); 191 setmsize(msgCount); 192 mailsize = ftell(ibuf); 193 Fclose(ibuf); 194 relsesigs(); 195 return(msgCount - omsgCount); 196 } 197 198 int *msgvec; 199 int reset_on_stop; /* do a reset() if stopped */ 200 201 /* 202 * Interpret user commands one by one. If standard input is not a tty, 203 * print no prompt. 204 */ 205 void 206 commands() 207 { 208 int eofloop = 0; 209 int n; 210 char linebuf[LINESIZE]; 211 #if __GNUC__ 212 /* Avoid longjmp clobbering */ 213 (void) &eofloop; 214 #endif 215 216 if (!sourcing) { 217 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 218 signal(SIGINT, intr); 219 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 220 signal(SIGHUP, hangup); 221 signal(SIGTSTP, stop); 222 signal(SIGTTOU, stop); 223 signal(SIGTTIN, stop); 224 } 225 setexit(); 226 for (;;) { 227 /* 228 * Print the prompt, if needed. Clear out 229 * string space, and flush the output. 230 */ 231 if (!sourcing && value("interactive") != NOSTR) { 232 if ((value("autoinc") != NOSTR) && (incfile() > 0)) 233 printf("New mail has arrived.\n"); 234 reset_on_stop = 1; 235 printf(prompt); 236 } 237 fflush(stdout); 238 sreset(); 239 /* 240 * Read a line of commands from the current input 241 * and handle end of file specially. 242 */ 243 n = 0; 244 for (;;) { 245 if (readline(input, &linebuf[n], LINESIZE - n) < 0) { 246 if (n == 0) 247 n = -1; 248 break; 249 } 250 if ((n = strlen(linebuf)) == 0) 251 break; 252 n--; 253 if (linebuf[n] != '\\') 254 break; 255 linebuf[n++] = ' '; 256 } 257 reset_on_stop = 0; 258 if (n < 0) { 259 /* eof */ 260 if (loading) 261 break; 262 if (sourcing) { 263 unstack(); 264 continue; 265 } 266 if (value("interactive") != NOSTR && 267 value("ignoreeof") != NOSTR && 268 ++eofloop < 25) { 269 printf("Use \"quit\" to quit.\n"); 270 continue; 271 } 272 break; 273 } 274 eofloop = 0; 275 if (execute(linebuf, 0)) 276 break; 277 } 278 } 279 280 /* 281 * Execute a single command. 282 * Command functions return 0 for success, 1 for error, and -1 283 * for abort. A 1 or -1 aborts a load or source. A -1 aborts 284 * the interactive command loop. 285 * Contxt is non-zero if called while composing mail. 286 */ 287 int 288 execute(linebuf, contxt) 289 char linebuf[]; 290 int contxt; 291 { 292 char word[LINESIZE]; 293 char *arglist[MAXARGC]; 294 const struct cmd *com = NULL; 295 char *cp, *cp2; 296 int c; 297 int muvec[2]; 298 int e = 1; 299 300 /* 301 * Strip the white space away from the beginning 302 * of the command, then scan out a word, which 303 * consists of anything except digits and white space. 304 * 305 * Handle ! escapes differently to get the correct 306 * lexical conventions. 307 */ 308 309 for (cp = linebuf; isspace((unsigned char)*cp); cp++) 310 ; 311 if (*cp == '!') { 312 if (sourcing) { 313 printf("Can't \"!\" while sourcing\n"); 314 goto out; 315 } 316 shell(cp+1); 317 return(0); 318 } 319 cp2 = word; 320 while (*cp && strchr(" \t0123456789$^.:/-+*'\"", *cp) == NOSTR) 321 *cp2++ = *cp++; 322 *cp2 = '\0'; 323 324 /* 325 * Look up the command; if not found, bitch. 326 * Normally, a blank command would map to the 327 * first command in the table; while sourcing, 328 * however, we ignore blank lines to eliminate 329 * confusion. 330 */ 331 332 if (sourcing && *word == '\0') 333 return(0); 334 com = lex(word); 335 if (com == NONE) { 336 printf("Unknown command: \"%s\"\n", word); 337 goto out; 338 } 339 340 /* 341 * See if we should execute the command -- if a conditional 342 * we always execute it, otherwise, check the state of cond. 343 */ 344 345 if ((com->c_argtype & F) == 0) 346 if ((cond == CRCV && !rcvmode) || (cond == CSEND && rcvmode)) 347 return(0); 348 349 /* 350 * Process the arguments to the command, depending 351 * on the type he expects. Default to an error. 352 * If we are sourcing an interactive command, it's 353 * an error. 354 */ 355 356 if (!rcvmode && (com->c_argtype & M) == 0) { 357 printf("May not execute \"%s\" while sending\n", 358 com->c_name); 359 goto out; 360 } 361 if (sourcing && com->c_argtype & I) { 362 printf("May not execute \"%s\" while sourcing\n", 363 com->c_name); 364 goto out; 365 } 366 if (readonly && com->c_argtype & W) { 367 printf("May not execute \"%s\" -- message file is read only\n", 368 com->c_name); 369 goto out; 370 } 371 if (contxt && com->c_argtype & R) { 372 printf("Cannot recursively invoke \"%s\"\n", com->c_name); 373 goto out; 374 } 375 switch (com->c_argtype & ~(F|P|I|M|T|W|R)) { 376 case MSGLIST: 377 /* 378 * A message list defaulting to nearest forward 379 * legal message. 380 */ 381 if (msgvec == 0) { 382 printf("Illegal use of \"message list\"\n"); 383 break; 384 } 385 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) 386 break; 387 if (c == 0) { 388 *msgvec = first(com->c_msgflag, 389 com->c_msgmask); 390 msgvec[1] = 0; 391 } 392 if (*msgvec == 0) { 393 printf("No applicable messages\n"); 394 break; 395 } 396 e = (*com->c_func)(msgvec); 397 break; 398 399 case NDMLIST: 400 /* 401 * A message list with no defaults, but no error 402 * if none exist. 403 */ 404 if (msgvec == 0) { 405 printf("Illegal use of \"message list\"\n"); 406 break; 407 } 408 if (getmsglist(cp, msgvec, com->c_msgflag) < 0) 409 break; 410 e = (*com->c_func)(msgvec); 411 break; 412 413 case STRLIST: 414 /* 415 * Just the straight string, with 416 * leading blanks removed. 417 */ 418 while (isspace((unsigned char)*cp)) 419 cp++; 420 e = (*com->c_func)(cp); 421 break; 422 423 case RAWLIST: 424 /* 425 * A vector of strings, in shell style. 426 */ 427 if ((c = getrawlist(cp, arglist, 428 sizeof arglist / sizeof *arglist)) < 0) 429 break; 430 if (c < com->c_minargs) { 431 printf("%s requires at least %d arg(s)\n", 432 com->c_name, com->c_minargs); 433 break; 434 } 435 if (c > com->c_maxargs) { 436 printf("%s takes no more than %d arg(s)\n", 437 com->c_name, com->c_maxargs); 438 break; 439 } 440 e = (*com->c_func)(arglist); 441 break; 442 443 case NOLIST: 444 /* 445 * Just the constant zero, for exiting, 446 * eg. 447 */ 448 e = (*com->c_func)(0); 449 break; 450 451 default: 452 errx(1, "Unknown argtype"); 453 } 454 455 out: 456 /* 457 * Exit the current source file on 458 * error. 459 */ 460 if (e) { 461 if (e < 0) 462 return 1; 463 if (loading) 464 return 1; 465 if (sourcing) 466 unstack(); 467 return 0; 468 } 469 if (com == NULL) 470 return(0); 471 if (value("autoprint") != NOSTR && com->c_argtype & P) 472 if ((dot->m_flag & MDELETED) == 0) { 473 muvec[0] = dot - &message[0] + 1; 474 muvec[1] = 0; 475 type(muvec); 476 } 477 if (!sourcing && (com->c_argtype & T) == 0) 478 sawcom = 1; 479 return(0); 480 } 481 482 /* 483 * Set the size of the message vector used to construct argument 484 * lists to message list functions. 485 */ 486 void 487 setmsize(sz) 488 int sz; 489 { 490 491 if (msgvec != 0) 492 free((char *) msgvec); 493 msgvec = (int *) calloc((unsigned) (sz + 1), sizeof *msgvec); 494 } 495 496 /* 497 * Find the correct command in the command table corresponding 498 * to the passed command "word" 499 */ 500 501 const struct cmd * 502 lex(word) 503 char word[]; 504 { 505 extern const struct cmd cmdtab[]; 506 const struct cmd *cp; 507 508 for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++) 509 if (isprefix(word, cp->c_name)) 510 return(cp); 511 return(NONE); 512 } 513 514 /* 515 * Determine if as1 is a valid prefix of as2. 516 * Return true if yep. 517 */ 518 int 519 isprefix(as1, as2) 520 char *as1, *as2; 521 { 522 char *s1, *s2; 523 524 s1 = as1; 525 s2 = as2; 526 while (*s1++ == *s2) 527 if (*s2++ == '\0') 528 return(1); 529 return(*--s1 == '\0'); 530 } 531 532 /* 533 * The following gets called on receipt of an interrupt. This is 534 * to abort printout of a command, mainly. 535 * Dispatching here when command() is inactive crashes rcv. 536 * Close all open files except 0, 1, 2, and the temporary. 537 * Also, unstack all source files. 538 */ 539 540 int inithdr; /* am printing startup headers */ 541 542 /*ARGSUSED*/ 543 void 544 intr(s) 545 int s; 546 { 547 548 noreset = 0; 549 if (!inithdr) 550 sawcom++; 551 inithdr = 0; 552 while (sourcing) 553 unstack(); 554 555 close_all_files(); 556 557 if (image >= 0) { 558 close(image); 559 image = -1; 560 } 561 fprintf(stderr, "Interrupt\n"); 562 reset(0); 563 } 564 565 /* 566 * When we wake up after ^Z, reprint the prompt. 567 */ 568 void 569 stop(s) 570 int s; 571 { 572 sig_t old_action = signal(s, SIG_DFL); 573 sigset_t nset; 574 575 sigemptyset(&nset); 576 sigaddset(&nset, s); 577 sigprocmask(SIG_UNBLOCK, &nset, NULL); 578 kill(0, s); 579 sigprocmask(SIG_BLOCK, &nset, NULL); 580 signal(s, old_action); 581 if (reset_on_stop) { 582 reset_on_stop = 0; 583 reset(0); 584 } 585 } 586 587 /* 588 * Branch here on hangup signal and simulate "exit". 589 */ 590 /*ARGSUSED*/ 591 void 592 hangup(s) 593 int s; 594 { 595 596 /* nothing to do? */ 597 exit(1); 598 } 599 600 /* 601 * Announce the presence of the current Mail version, 602 * give the message count, and print a header listing. 603 */ 604 void 605 announce() 606 { 607 int vec[2], mdot; 608 609 mdot = newfileinfo(0); 610 vec[0] = mdot; 611 vec[1] = 0; 612 dot = &message[mdot - 1]; 613 if (msgCount > 0 && value("noheader") == NOSTR) { 614 inithdr++; 615 headers(vec); 616 inithdr = 0; 617 } 618 } 619 620 /* 621 * Announce information about the file we are editing. 622 * Return a likely place to set dot. 623 */ 624 int 625 newfileinfo(omsgCount) 626 int omsgCount; 627 { 628 struct message *mp; 629 int u, n, mdot, d, s, l; 630 char fname[PATHSIZE], zname[PATHSIZE], *ename; 631 632 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++) 633 if (mp->m_flag & MNEW) 634 break; 635 if (mp >= &message[msgCount]) 636 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++) 637 if ((mp->m_flag & MREAD) == 0) 638 break; 639 if (mp < &message[msgCount]) 640 mdot = mp - &message[0] + 1; 641 else 642 mdot = omsgCount + 1; 643 s = d = 0; 644 for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) { 645 if (mp->m_flag & MNEW) 646 n++; 647 if ((mp->m_flag & MREAD) == 0) 648 u++; 649 if (mp->m_flag & MDELETED) 650 d++; 651 if (mp->m_flag & MSAVED) 652 s++; 653 } 654 ename = mailname; 655 if (getfold(fname) >= 0) { 656 l = strlen(fname); 657 if (l < PATHSIZE - 1) 658 fname[l++] = '/'; 659 if (strncmp(fname, mailname, l) == 0) { 660 snprintf(zname, PATHSIZE, "+%s", 661 mailname + l); 662 ename = zname; 663 } 664 } 665 printf("\"%s\": ", ename); 666 if (msgCount == 1) 667 printf("1 message"); 668 else 669 printf("%d messages", msgCount); 670 if (n > 0) 671 printf(" %d new", n); 672 if (u-n > 0) 673 printf(" %d unread", u); 674 if (d > 0) 675 printf(" %d deleted", d); 676 if (s > 0) 677 printf(" %d saved", s); 678 if (readonly) 679 printf(" [Read only]"); 680 printf("\n"); 681 return(mdot); 682 } 683 684 /* 685 * Print the current version number. 686 */ 687 688 /*ARGSUSED*/ 689 int 690 pversion(v) 691 void *v; 692 { 693 extern char *version; 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