1 /* $NetBSD: lex.c,v 1.47 2024/08/17 19:18:10 andvar 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)lex.c 8.2 (Berkeley) 4/20/95"; 36 #else 37 __RCSID("$NetBSD: lex.c,v 1.47 2024/08/17 19:18:10 andvar Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <assert.h> 42 #include <util.h> 43 44 #include "rcv.h" 45 #include "extern.h" 46 #ifdef USE_EDITLINE 47 #include "complete.h" 48 #endif 49 #include "format.h" 50 #include "sig.h" 51 #include "thread.h" 52 53 /* 54 * Mail -- a mail program 55 * 56 * Lexical processing of commands. 57 */ 58 59 static const char *prompt = DEFAULT_PROMPT; 60 static int *msgvec; 61 static int inithdr; /* Am printing startup headers. */ 62 static jmp_buf jmpbuf; /* The reset jmpbuf */ 63 static int reset_on_stop; /* To do job control longjmp. */ 64 65 #ifdef DEBUG_FILE_LEAK 66 struct glue { 67 struct glue *next; 68 int niobs; 69 FILE *iobs; 70 }; 71 extern struct glue __sglue; 72 73 static int open_fd_cnt; 74 static int open_fp_cnt; 75 76 static int 77 file_count(void) 78 { 79 struct glue *gp; 80 FILE *fp; 81 int n; 82 int cnt; 83 84 cnt = 0; 85 for (gp = &__sglue; gp; gp = gp->next) { 86 for (fp = gp->iobs, n = gp->niobs; --n >= 0; fp++) 87 if (fp->_flags) 88 cnt++; 89 } 90 return cnt; 91 } 92 93 static int 94 fds_count(void) 95 { 96 int maxfd; 97 int cnt; 98 int fd; 99 100 maxfd = fcntl(0, F_MAXFD); 101 if (maxfd == -1) { 102 warn("fcntl"); 103 return -1; 104 } 105 106 cnt = 0; 107 for (fd = 0; fd <= maxfd; fd++) { 108 struct stat sb; 109 110 if (fstat(fd, &sb) != -1) 111 cnt++; 112 else if (errno != EBADF 113 #ifdef BROKEN_CLONE_STAT /* see PRs 37878 and 37550 */ 114 && errno != EOPNOTSUPP 115 #endif 116 ) 117 warn("fstat(%d): errno=%d", fd, errno); 118 } 119 return cnt; 120 } 121 122 static void 123 file_leak_init(void) 124 { 125 open_fd_cnt = fds_count(); 126 open_fp_cnt = file_count(); 127 } 128 129 static void 130 file_leak_check(void) 131 { 132 if (open_fp_cnt != file_count() || 133 open_fd_cnt != fds_count()) { 134 (void)printf("FILE LEAK WARNING: " 135 "fp-count: %d (%d) " 136 "fd-count: %d (%d) max-fd: %d\n", 137 file_count(), open_fp_cnt, 138 fds_count(), open_fd_cnt, 139 fcntl(0, F_MAXFD)); 140 } 141 } 142 #endif /* DEBUG_FILE_LEAK */ 143 144 static void 145 update_mailname(const char *name) 146 { 147 char tbuf[PATHSIZE]; 148 size_t l; 149 150 /* Don't realpath(3) if it's only an update request */ 151 if (name != NULL && realpath(name, mailname) == NULL) { 152 warn("Can't canonicalize `%s'", name); 153 return; 154 } 155 156 if (getfold(tbuf, sizeof(tbuf)) >= 0) { 157 l = strlen(tbuf); 158 if (l < sizeof(tbuf) - 1) 159 tbuf[l++] = '/'; 160 if (strncmp(tbuf, mailname, l) == 0) { 161 char const *sep = "", *cp = mailname + l; 162 163 l = strlen(cp); 164 if (l >= sizeof(displayname)) { 165 cp += l; 166 cp -= sizeof(displayname) - 5; 167 sep = "..."; 168 } 169 (void)snprintf(displayname, sizeof(displayname), 170 "+%s%.*s", sep, 171 (int)(sizeof(displayname) - 1 - strlen(sep)), cp); 172 return; 173 } 174 } 175 176 l = strlen(mailname); 177 if (l < sizeof(displayname)) 178 strcpy(displayname, mailname); 179 else { 180 l -= sizeof(displayname) - 4 - sizeof(displayname) / 3; 181 (void)snprintf(displayname, sizeof(displayname), "%.*s...%s", 182 (int)sizeof(displayname) / 3, mailname, mailname + l); 183 } 184 } 185 186 /* 187 * Set the size of the message vector used to construct argument 188 * lists to message list functions. 189 */ 190 static void 191 setmsize(int sz) 192 { 193 if (msgvec != 0) 194 free(msgvec); 195 msgvec = ecalloc((size_t) (sz + 1), sizeof(*msgvec)); 196 } 197 198 /* 199 * Set up editing on the given file name. 200 * If the first character of name is %, we are considered to be 201 * editing the file, otherwise we are reading our mail which has 202 * significance for mbox and so forth. 203 */ 204 PUBLIC int 205 setfile(const char *name) 206 { 207 FILE *ibuf; 208 int i, fd; 209 struct stat stb; 210 char isedit = *name != '%' || getuserid(myname) != (int)getuid(); 211 const char *who = name[1] ? name + 1 : myname; 212 static int shudclob; 213 char tempname[PATHSIZE]; 214 215 if ((name = expand(name)) == NULL) 216 return -1; 217 218 if ((ibuf = Fopen(name, "ref")) == NULL) { 219 if (!isedit && errno == ENOENT) 220 goto nomail; 221 warn("Can't open `%s'", name); 222 return -1; 223 } 224 225 if (fstat(fileno(ibuf), &stb) < 0) { 226 warn("fstat"); 227 (void)Fclose(ibuf); 228 return -1; 229 } 230 231 switch (stb.st_mode & S_IFMT) { 232 case S_IFDIR: 233 (void)Fclose(ibuf); 234 errno = EISDIR; 235 warn("%s", name); 236 return -1; 237 238 case S_IFREG: 239 break; 240 241 default: 242 (void)Fclose(ibuf); 243 errno = EINVAL; 244 warn("%s", name); 245 return -1; 246 } 247 248 /* 249 * Looks like all will be well. We must now relinquish our 250 * hold on the current set of stuff. Must hold signals 251 * while we are reading the new file, else we will ruin 252 * the message[] data structure. 253 */ 254 255 sig_check(); 256 sig_hold(); 257 if (shudclob) 258 quit(jmpbuf); 259 260 /* 261 * Copy the messages into /tmp 262 * and set pointers. 263 */ 264 265 readonly = 0; 266 if ((i = open(name, O_WRONLY)) < 0) 267 readonly++; 268 else 269 (void)close(i); 270 if (shudclob) { 271 (void)fclose(itf); 272 (void)fclose(otf); 273 } 274 shudclob = 1; 275 edit = isedit; 276 (void)strcpy(prevfile, mailname); 277 update_mailname(name != mailname ? name : NULL); 278 mailsize = fsize(ibuf); 279 (void)snprintf(tempname, sizeof(tempname), 280 "%s/mail.RxXXXXXXXXXX", tmpdir); 281 if ((fd = mkstemp(tempname)) == -1 || 282 (otf = fdopen(fd, "wef")) == NULL) 283 err(EXIT_FAILURE, "Can't create tmp file `%s'", tempname); 284 if ((itf = fopen(tempname, "ref")) == NULL) 285 err(EXIT_FAILURE, "Can't create tmp file `%s'", tempname); 286 (void)rm(tempname); 287 setptr(ibuf, (off_t)0); 288 setmsize(get_abs_msgCount()); 289 /* 290 * New mail may have arrived while we were reading 291 * the mail file, so reset mailsize to be where 292 * we really are in the file... 293 */ 294 mailsize = ftell(ibuf); 295 (void)Fclose(ibuf); 296 sig_release(); 297 sig_check(); 298 sawcom = 0; 299 if (!edit && get_abs_msgCount() == 0) { 300 nomail: 301 (void)fprintf(stderr, "No mail for %s\n", who); 302 return -1; 303 } 304 return 0; 305 } 306 307 /* 308 * Incorporate any new mail that has arrived since we first 309 * started reading mail. 310 */ 311 PUBLIC int 312 incfile(void) 313 { 314 off_t newsize; 315 int omsgCount; 316 FILE *ibuf; 317 int rval; 318 319 omsgCount = get_abs_msgCount(); 320 321 ibuf = Fopen(mailname, "ref"); 322 if (ibuf == NULL) 323 return -1; 324 sig_check(); 325 sig_hold(); 326 newsize = fsize(ibuf); 327 if (newsize == 0 || /* mail box is now empty??? */ 328 newsize < mailsize) { /* mail box has shrunk??? */ 329 rval = -1; 330 goto done; 331 } 332 if (newsize == mailsize) { 333 rval = 0; /* no new mail */ 334 goto done; 335 } 336 setptr(ibuf, mailsize); /* read in new mail */ 337 setmsize(get_abs_msgCount()); /* get the new message count */ 338 mailsize = ftell(ibuf); 339 rval = get_abs_msgCount() - omsgCount; 340 done: 341 (void)Fclose(ibuf); 342 sig_release(); 343 sig_check(); 344 return rval; 345 } 346 347 /* 348 * Return a pointer to the comment character, respecting quoting as 349 * done in getrawlist(). The comment character is ignored inside 350 * quotes. 351 */ 352 static char * 353 comment_char(char *line) 354 { 355 char *p; 356 char quotec; 357 quotec = '\0'; 358 for (p = line; *p; p++) { 359 if (quotec != '\0') { 360 if (*p == quotec) 361 quotec = '\0'; 362 } 363 else if (*p == '"' || *p == '\'') 364 quotec = *p; 365 else if (*p == COMMENT_CHAR) 366 return p; 367 } 368 return NULL; 369 } 370 371 /* 372 * Signal handler is hooked by setup_piping(). 373 * Respond to a broken pipe signal -- 374 * probably caused by quitting more. 375 */ 376 static jmp_buf pipestop; 377 378 /*ARGSUSED*/ 379 __dead static void 380 lex_brokpipe(int signo) 381 { 382 383 longjmp(pipestop, signo); 384 } 385 386 /* 387 * Check the command line for any requested piping or redirection, 388 * depending on the value of 'c'. If "enable-pipes" is set, search 389 * the command line (cp) for the first occurrence of the character 'c' 390 * that is not in a quote or (parenthese) group. 391 */ 392 PUBLIC char * 393 shellpr(char *cp) 394 { 395 int quotec; 396 int level; 397 398 if (cp == NULL || value(ENAME_ENABLE_PIPES) == NULL) 399 return NULL; 400 401 level = 0; 402 quotec = 0; 403 for (/*EMPTY*/; *cp != '\0'; cp++) { 404 if (quotec) { 405 if (*cp == quotec) 406 quotec = 0; 407 if (*cp == '\\' && 408 (cp[1] == quotec || cp[1] == '\\')) 409 cp++; 410 } 411 else { 412 switch (*cp) { 413 case '|': 414 case '>': 415 if (level == 0) 416 return cp; 417 break; 418 case '(': 419 level++; 420 break; 421 case ')': 422 level--; 423 break; 424 case '"': 425 case '\'': 426 quotec = *cp; 427 break; 428 default: 429 break; 430 } 431 } 432 } 433 return NULL; 434 } 435 436 static int 437 do_paging(const char *cmd, int c_pipe) 438 { 439 char *cp, *p; 440 441 if (value(ENAME_PAGER_OFF) != NULL) 442 return 0; 443 444 if (c_pipe & C_PIPE_PAGER) 445 return 1; 446 447 if (c_pipe & C_PIPE_CRT && value(ENAME_CRT) != NULL) 448 return 1; 449 450 if ((cp = value(ENAME_PAGE_ALSO)) == NULL) 451 return 0; 452 453 if ((p = strcasestr(cp, cmd)) == NULL) 454 return 0; 455 456 if (p != cp && p[-1] != ',' && !is_WSP(p[-1])) 457 return 0; 458 459 p += strlen(cmd); 460 461 return (*p == '\0' || *p == ',' || is_WSP(*p)); 462 } 463 464 /* 465 * Setup any pipe or redirection that the command line indicates. 466 * If none, then setup the pager unless "pager-off" is defined. 467 */ 468 static FILE *fp_stop = NULL; 469 static int oldfd1 = -1; 470 static sig_t old_sigpipe; 471 472 static int 473 setup_piping(const char *cmd, char *cmdline, int c_pipe) 474 { 475 FILE *fout; 476 FILE *last_file; 477 char *cp; 478 479 sig_check(); 480 481 last_file = last_registered_file(0); 482 483 fout = NULL; 484 if ((cp = shellpr(cmdline)) != NULL) { 485 char c; 486 c = *cp; 487 *cp = '\0'; 488 cp++; 489 490 if (c == '|') { 491 if ((fout = Popen(cp, "we")) == NULL) { 492 warn("Popen: %s", cp); 493 return -1; 494 } 495 } 496 else { 497 const char *mode; 498 assert(c == '>'); 499 mode = *cp == '>' ? "ae" : "we"; 500 if (*cp == '>') 501 cp++; 502 503 cp = skip_WSP(cp); 504 if ((fout = Fopen(cp, mode)) == NULL) { 505 warn("Fopen: %s", cp); 506 return -1; 507 } 508 } 509 510 } 511 else if (do_paging(cmd, c_pipe)) { 512 const char *pager; 513 pager = value(ENAME_PAGER); 514 if (pager == NULL || *pager == '\0') 515 pager = _PATH_MORE; 516 517 if ((fout = Popen(pager, "we")) == NULL) { 518 warn("Popen: %s", pager); 519 return -1; 520 } 521 } 522 523 if (fout) { 524 old_sigpipe = sig_signal(SIGPIPE, lex_brokpipe); 525 (void)fflush(stdout); 526 if ((oldfd1 = dup(STDOUT_FILENO)) == -1) 527 err(EXIT_FAILURE, "dup failed"); 528 if (dup2(fileno(fout), STDOUT_FILENO) == -1) 529 err(EXIT_FAILURE, "dup2 failed"); 530 fp_stop = last_file; 531 } 532 return 0; 533 } 534 535 /* 536 * This will close any piping started by setup_piping(). 537 */ 538 static void 539 close_piping(void) 540 { 541 sigset_t oset; 542 struct sigaction osa; 543 544 if (oldfd1 != -1) { 545 (void)fflush(stdout); 546 if (fileno(stdout) != oldfd1 && 547 dup2(oldfd1, STDOUT_FILENO) == -1) 548 err(EXIT_FAILURE, "dup2 failed"); 549 550 (void)sig_ignore(SIGPIPE, &osa, &oset); 551 552 close_top_files(fp_stop); 553 fp_stop = NULL; 554 (void)close(oldfd1); 555 oldfd1 = -1; 556 557 (void)sig_signal(SIGPIPE, old_sigpipe); 558 (void)sig_restore(SIGPIPE, &osa, &oset); 559 } 560 sig_check(); 561 } 562 563 /* 564 * Determine if as1 is a valid prefix of as2. 565 * Return true if yep. 566 */ 567 static int 568 isprefix(char *as1, const char *as2) 569 { 570 char *s1; 571 const char *s2; 572 573 s1 = as1; 574 s2 = as2; 575 while (*s1++ == *s2) 576 if (*s2++ == '\0') 577 return 1; 578 return *--s1 == '\0'; 579 } 580 581 /* 582 * Find the correct command in the command table corresponding 583 * to the passed command "word" 584 */ 585 PUBLIC const struct cmd * 586 lex(char word[]) 587 { 588 const struct cmd *cp; 589 590 for (cp = &cmdtab[0]; cp->c_name != NULL; cp++) 591 if (isprefix(word, cp->c_name)) 592 return cp; 593 return NULL; 594 } 595 596 PUBLIC char * 597 get_cmdname(char *buf) 598 { 599 char *cp; 600 char *cmd; 601 size_t len; 602 603 for (cp = buf; *cp; cp++) 604 if (strchr(" \t0123456789$^.:/-+*'\">|", *cp) != NULL) 605 break; 606 /* XXX - Don't miss the pipe command! */ 607 if (cp == buf && *cp == '|') 608 cp++; 609 len = cp - buf + 1; 610 cmd = salloc(len); 611 (void)strlcpy(cmd, buf, len); 612 return cmd; 613 } 614 615 /* 616 * Execute a single command. 617 * Command functions return 0 for success, 1 for error, and -1 618 * for abort. A 1 or -1 aborts a load or source. A -1 aborts 619 * the interactive command loop. 620 * execute_contxt_e is in extern.h. 621 */ 622 PUBLIC int 623 execute(char linebuf[], enum execute_contxt_e contxt) 624 { 625 char *word; 626 char *arglist[MAXARGC]; 627 const struct cmd * volatile com = NULL; 628 char *volatile cp; 629 int retval; 630 int c; 631 volatile int e = 1; 632 633 /* 634 * Strip the white space away from the beginning 635 * of the command, then scan out a word, which 636 * consists of anything except digits and white space. 637 * 638 * Handle ! escapes differently to get the correct 639 * lexical conventions. 640 */ 641 642 cp = skip_space(linebuf); 643 if (*cp == '!') { 644 if (sourcing) { 645 (void)printf("Can't \"!\" while sourcing\n"); 646 goto out; 647 } 648 (void)shell(cp + 1); 649 return 0; 650 } 651 652 word = get_cmdname(cp); 653 cp += strlen(word); 654 655 /* 656 * Look up the command; if not found, bitch. 657 * Normally, a blank command would map to the 658 * first command in the table; while sourcing, 659 * however, we ignore blank lines to eliminate 660 * confusion. 661 */ 662 663 if (sourcing && *word == '\0') 664 return 0; 665 com = lex(word); 666 if (com == NULL) { 667 (void)printf("Unknown command: \"%s\"\n", word); 668 goto out; 669 } 670 671 /* 672 * See if we should execute the command -- if a conditional 673 * we always execute it, otherwise, check the state of cond. 674 */ 675 676 if ((com->c_argtype & F) == 0 && (cond & CSKIP)) 677 return 0; 678 679 /* 680 * Process the arguments to the command, depending 681 * on the type he expects. Default to an error. 682 * If we are sourcing an interactive command, it's 683 * an error. 684 */ 685 686 if (mailmode == mm_sending && (com->c_argtype & M) == 0) { 687 (void)printf("May not execute \"%s\" while sending\n", 688 com->c_name); 689 goto out; 690 } 691 if (sourcing && com->c_argtype & I) { 692 (void)printf("May not execute \"%s\" while sourcing\n", 693 com->c_name); 694 goto out; 695 } 696 if (readonly && com->c_argtype & W) { 697 (void)printf("May not execute \"%s\" -- message file is read only\n", 698 com->c_name); 699 goto out; 700 } 701 if (contxt == ec_composing && com->c_argtype & R) { 702 (void)printf("Cannot recursively invoke \"%s\"\n", com->c_name); 703 goto out; 704 } 705 706 if (!sourcing && com->c_pipe && value(ENAME_INTERACTIVE) != NULL) { 707 708 sig_check(); 709 if (setjmp(pipestop)) 710 goto out; 711 712 if (setup_piping(com->c_name, cp, com->c_pipe) == -1) 713 goto out; 714 } 715 switch (com->c_argtype & ARGTYPE_MASK) { 716 case MSGLIST: 717 /* 718 * A message list defaulting to nearest forward 719 * legal message. 720 */ 721 if (msgvec == 0) { 722 (void)printf("Illegal use of \"message list\"\n"); 723 break; 724 } 725 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) 726 break; 727 if (c == 0) { 728 *msgvec = first(com->c_msgflag, com->c_msgmask); 729 msgvec[1] = 0; 730 } 731 if (*msgvec == 0) { 732 (void)printf("No applicable messages\n"); 733 break; 734 } 735 e = (*com->c_func)(msgvec); 736 break; 737 738 case NDMLIST: 739 /* 740 * A message list with no defaults, but no error 741 * if none exist. 742 */ 743 if (msgvec == 0) { 744 (void)printf("Illegal use of \"message list\"\n"); 745 break; 746 } 747 if (getmsglist(cp, msgvec, com->c_msgflag) < 0) 748 break; 749 e = (*com->c_func)(msgvec); 750 break; 751 752 case STRLIST: 753 /* 754 * Just the straight string, with 755 * leading blanks removed. 756 */ 757 cp = skip_space(cp); 758 e = (*com->c_func)(cp); 759 break; 760 761 case RAWLIST: 762 /* 763 * A vector of strings, in shell style. 764 */ 765 if ((c = getrawlist(cp, arglist, (int)__arraycount(arglist))) < 0) 766 break; 767 if (c < com->c_minargs) { 768 (void)printf("%s requires at least %d arg(s)\n", 769 com->c_name, com->c_minargs); 770 break; 771 } 772 if (c > com->c_maxargs) { 773 (void)printf("%s takes no more than %d arg(s)\n", 774 com->c_name, com->c_maxargs); 775 break; 776 } 777 e = (*com->c_func)(arglist); 778 break; 779 780 case NOLIST: 781 /* 782 * Just the constant zero, for exiting, 783 * eg. 784 */ 785 e = (*com->c_func)(0); 786 break; 787 788 default: 789 errx(EXIT_FAILURE, "Unknown argtype"); 790 } 791 792 out: 793 close_piping(); 794 795 /* 796 * Exit the current source file on 797 * error. 798 */ 799 retval = 0; 800 if (e) { 801 if (e < 0) 802 retval = 1; 803 else if (loading) 804 retval = 1; 805 else if (sourcing) 806 (void)unstack(); 807 } 808 else if (com != NULL) { 809 if (contxt != ec_autoprint && com->c_argtype & P && 810 value(ENAME_AUTOPRINT) != NULL && 811 (dot->m_flag & MDELETED) == 0) 812 (void)execute(__UNCONST("print ."), ec_autoprint); 813 if (!sourcing && (com->c_argtype & T) == 0) 814 sawcom = 1; 815 } 816 sig_check(); 817 return retval; 818 } 819 820 /* 821 * The following gets called on receipt of an interrupt. This is 822 * to abort printout of a command, mainly. 823 * Dispatching here when commands() is inactive crashes rcv. 824 * Close all open files except 0, 1, 2, and the temporary. 825 * Also, unstack all source files. 826 */ 827 __dead static void 828 lex_intr(int signo) 829 { 830 831 noreset = 0; 832 if (!inithdr) 833 sawcom++; 834 inithdr = 0; 835 while (sourcing) 836 (void)unstack(); 837 838 close_piping(); 839 close_all_files(); 840 841 if (image >= 0) { 842 (void)close(image); 843 image = -1; 844 } 845 (void)fprintf(stderr, "Interrupt\n"); 846 longjmp(jmpbuf, signo); 847 } 848 849 /* 850 * Branch here on hangup signal and simulate "exit". 851 */ 852 /*ARGSUSED*/ 853 __dead static void 854 lex_hangup(int s __unused) 855 { 856 857 /* nothing to do? */ 858 exit(EXIT_FAILURE); 859 } 860 861 /* 862 * When we wake up after ^Z, reprint the prompt. 863 * 864 * NOTE: EditLine deals with the prompt and job control, so with it 865 * this does nothing, i.e., reset_on_stop == 0. 866 */ 867 static void 868 lex_stop(int signo) 869 { 870 871 if (reset_on_stop) { 872 reset_on_stop = 0; 873 longjmp(jmpbuf, signo); 874 } 875 } 876 877 /* 878 * Interpret user commands one by one. If standard input is not a tty, 879 * print no prompt. 880 */ 881 PUBLIC void 882 commands(void) 883 { 884 int n; 885 char linebuf[LINESIZE]; 886 int eofloop; 887 888 #ifdef DEBUG_FILE_LEAK 889 file_leak_init(); 890 #endif 891 892 if (!sourcing) { 893 sig_check(); 894 895 sig_hold(); 896 (void)sig_signal(SIGINT, lex_intr); 897 (void)sig_signal(SIGHUP, lex_hangup); 898 (void)sig_signal(SIGTSTP, lex_stop); 899 (void)sig_signal(SIGTTOU, lex_stop); 900 (void)sig_signal(SIGTTIN, lex_stop); 901 sig_release(); 902 } 903 904 (void)setjmp(jmpbuf); /* "reset" location if we got an interrupt */ 905 906 eofloop = 0; /* initialize this after a possible longjmp */ 907 for (;;) { 908 sig_check(); 909 (void)fflush(stdout); 910 sreset(); 911 /* 912 * Print the prompt, if needed. Clear out 913 * string space, and flush the output. 914 */ 915 if (!sourcing && value(ENAME_INTERACTIVE) != NULL) { 916 if ((prompt = value(ENAME_PROMPT)) == NULL) 917 prompt = DEFAULT_PROMPT; 918 prompt = smsgprintf(prompt, dot); 919 if ((value(ENAME_AUTOINC) != NULL) && (incfile() > 0)) 920 (void)printf("New mail has arrived.\n"); 921 922 #ifndef USE_EDITLINE 923 reset_on_stop = 1; /* enable job control longjmp */ 924 (void)printf("%s", prompt); 925 #endif 926 } 927 #ifdef DEBUG_FILE_LEAK 928 file_leak_check(); 929 #endif 930 /* 931 * Read a line of commands from the current input 932 * and handle end of file specially. 933 */ 934 n = 0; 935 for (;;) { 936 sig_check(); 937 #ifdef USE_EDITLINE 938 if (!sourcing) { 939 char *line; 940 941 line = my_gets(&elm.command, prompt, NULL); 942 if (line == NULL) { 943 if (n == 0) 944 n = -1; 945 break; 946 } 947 (void)strlcpy(linebuf, line, sizeof(linebuf)); 948 } 949 else { 950 if (readline(input, &linebuf[n], LINESIZE - n, 0) < 0) { 951 if (n == 0) 952 n = -1; 953 break; 954 } 955 } 956 #else /* USE_EDITLINE */ 957 if (readline(input, &linebuf[n], LINESIZE - n, reset_on_stop) < 0) { 958 if (n == 0) 959 n = -1; 960 break; 961 } 962 #endif /* USE_EDITLINE */ 963 if (!sourcing) 964 setscreensize(); /* so we can resize window */ 965 966 if (sourcing) { /* allow comments in source files */ 967 char *ptr; 968 if ((ptr = comment_char(linebuf)) != NULL) 969 *ptr = '\0'; 970 } 971 if ((n = (int)strlen(linebuf)) == 0) 972 break; 973 n--; 974 if (linebuf[n] != '\\') 975 break; 976 linebuf[n++] = ' '; 977 } 978 #ifndef USE_EDITLINE 979 sig_check(); 980 reset_on_stop = 0; /* disable job control longjmp */ 981 #endif 982 if (n < 0) { 983 char *p; 984 985 /* eof */ 986 if (loading) 987 break; 988 if (sourcing) { 989 (void)unstack(); 990 continue; 991 } 992 if (value(ENAME_INTERACTIVE) != NULL && 993 (p = value(ENAME_IGNOREEOF)) != NULL && 994 ++eofloop < (*p == '\0' ? 25 : atoi(p))) { 995 (void)printf("Use \"quit\" to quit.\n"); 996 continue; 997 } 998 break; 999 } 1000 eofloop = 0; 1001 if (execute(linebuf, ec_normal)) 1002 break; 1003 } 1004 } 1005 1006 /* 1007 * Announce information about the file we are editing. 1008 * Return a likely place to set dot. 1009 */ 1010 PUBLIC int 1011 newfileinfo(int omsgCount) 1012 { 1013 struct message *mp; 1014 int d, n, s, t, u, mdot; 1015 1016 /* 1017 * Figure out where to set the 'dot'. Use the first new or 1018 * unread message. 1019 */ 1020 for (mp = get_abs_message(omsgCount + 1); mp; 1021 mp = next_abs_message(mp)) 1022 if (mp->m_flag & MNEW) 1023 break; 1024 1025 if (mp == NULL) 1026 for (mp = get_abs_message(omsgCount + 1); mp; 1027 mp = next_abs_message(mp)) 1028 if ((mp->m_flag & MREAD) == 0) 1029 break; 1030 if (mp != NULL) 1031 mdot = get_msgnum(mp); 1032 else 1033 mdot = omsgCount + 1; 1034 #ifdef THREAD_SUPPORT 1035 /* 1036 * See if the message is in the current thread. 1037 */ 1038 if (mp != NULL && get_message(1) != NULL && get_message(mdot) != mp) 1039 mdot = 0; 1040 #endif 1041 /* 1042 * Scan the message array counting the new, unread, deleted, 1043 * and saved messages. 1044 */ 1045 d = n = s = t = u = 0; 1046 for (mp = get_abs_message(1); mp; mp = next_abs_message(mp)) { 1047 if (mp->m_flag & MNEW) 1048 n++; 1049 if ((mp->m_flag & MREAD) == 0) 1050 u++; 1051 if (mp->m_flag & MDELETED) 1052 d++; 1053 if (mp->m_flag & MSAVED) 1054 s++; 1055 if (mp->m_flag & MTAGGED) 1056 t++; 1057 } 1058 /* 1059 * Display the statistics. 1060 */ 1061 update_mailname(NULL); 1062 (void)printf("\"%s\": ", displayname); 1063 { 1064 int cnt = get_abs_msgCount(); 1065 (void)printf("%d message%s", cnt, cnt == 1 ? "" : "s"); 1066 } 1067 if (n > 0) 1068 (void)printf(" %d new", n); 1069 if (u-n > 0) 1070 (void)printf(" %d unread", u); 1071 if (t > 0) 1072 (void)printf(" %d tagged", t); 1073 if (d > 0) 1074 (void)printf(" %d deleted", d); 1075 if (s > 0) 1076 (void)printf(" %d saved", s); 1077 if (readonly) 1078 (void)printf(" [Read only]"); 1079 (void)printf("\n"); 1080 1081 return mdot; 1082 } 1083 1084 /* 1085 * Announce the presence of the current Mail version, 1086 * give the message count, and print a header listing. 1087 */ 1088 PUBLIC void 1089 announce(void) 1090 { 1091 int vec[2], mdot; 1092 1093 mdot = newfileinfo(0); 1094 vec[0] = mdot; 1095 vec[1] = 0; 1096 if ((dot = get_message(mdot)) == NULL) 1097 dot = get_abs_message(1); /* make sure we get something! */ 1098 if (get_abs_msgCount() > 0 && value(ENAME_NOHEADER) == NULL) { 1099 inithdr++; 1100 (void)headers(vec); 1101 inithdr = 0; 1102 } 1103 } 1104 1105 /* 1106 * Print the current version number. 1107 */ 1108 1109 /*ARGSUSED*/ 1110 PUBLIC int 1111 pversion(void *v __unused) 1112 { 1113 (void)printf("Version %s\n", version); 1114 return 0; 1115 } 1116 1117 /* 1118 * Load a file of user definitions. 1119 */ 1120 PUBLIC void 1121 load(const char *name) 1122 { 1123 FILE *in, *oldin; 1124 1125 if ((in = Fopen(name, "ref")) == NULL) 1126 return; 1127 oldin = input; 1128 input = in; 1129 loading = 1; 1130 sourcing = 1; 1131 commands(); 1132 loading = 0; 1133 sourcing = 0; 1134 input = oldin; 1135 (void)Fclose(in); 1136 } 1137
Indexes created Sat Sep 20 22:09:52 GMT 2025