1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 /* 33 * msgs - a user bulletin board program 34 * 35 * usage: 36 * msgs [fhlopq] [[-]number] to read messages 37 * msgs -s to place messages 38 * msgs -c [-days] to clean up the bulletin board 39 * 40 * prompt commands are: 41 * y print message 42 * n flush message, go to next message 43 * q flush message, quit 44 * p print message, turn on 'pipe thru more' mode 45 * P print message, turn off 'pipe thru more' mode 46 * - reprint last message 47 * s[-][<num>] [<filename>] save message 48 * m[-][<num>] mail with message in temp mbox 49 * x exit without flushing this message 50 * <num> print message number <num> 51 */ 52 53 #define V7 /* will look for TERM in the environment */ 54 #define OBJECT /* will object to messages without Subjects */ 55 /* #define REJECT */ /* will reject messages without Subjects 56 (OBJECT must be defined also) */ 57 /* #define UNBUFFERED *//* use unbuffered output */ 58 59 #include <sys/param.h> 60 #include <sys/stat.h> 61 #include <ctype.h> 62 #include <dirent.h> 63 #include <err.h> 64 #include <errno.h> 65 #include <fcntl.h> 66 #include <locale.h> 67 #include <pwd.h> 68 #include <setjmp.h> 69 #include <termcap.h> 70 #include <termios.h> 71 #include <signal.h> 72 #include <stdio.h> 73 #include <stdlib.h> 74 #include <string.h> 75 #include <time.h> 76 #include <unistd.h> 77 #include <stdbool.h> 78 #include "pathnames.h" 79 80 #define CMODE 0644 /* bounds file creation mode */ 81 #define SUPERUSER 0 /* superuser uid */ 82 #define DAEMON 1 /* daemon uid */ 83 #define NLINES 24 /* default number of lines/crt screen */ 84 #define NDAYS 21 /* default keep time for messages */ 85 #define DAYS *24*60*60 /* seconds/day */ 86 #define MSGSRC ".msgsrc" /* user's rc file */ 87 #define BOUNDS "bounds" /* message bounds file */ 88 #define NEXT "Next message? [yq]" 89 #define MORE "More? [ynq]" 90 #define NOMORE "(No more) [q] ?" 91 92 static FILE *msgsrc; 93 static FILE *newmsg; 94 static const char *sep = "-"; 95 static char inbuf[BUFSIZ]; 96 static char fname[MAXPATHLEN]; 97 static char cmdbuf[MAXPATHLEN + MAXPATHLEN]; 98 static char subj[128]; 99 static char from[128]; 100 static char date[128]; 101 static char *ptr; 102 static char *in; 103 static bool local; 104 static bool ruptible; 105 static bool totty; 106 static bool seenfrom; 107 static bool seensubj; 108 static bool blankline; 109 static bool printing = false; 110 static bool mailing = false; 111 static bool quitit = false; 112 static bool sending = false; 113 static bool intrpflg = false; 114 static uid_t uid; 115 static int msg; 116 static int prevmsg; 117 static int lct; 118 static int nlines; 119 static int Lpp = 0; 120 static time_t t; 121 static time_t keep; 122 123 /* option initialization */ 124 static bool hdrs = false; 125 static bool qopt = false; 126 static bool hush = false; 127 static bool send_msg = false; 128 static bool locomode = false; 129 static bool use_pager = false; 130 static bool clean = false; 131 static bool lastcmd = false; 132 static jmp_buf tstpbuf; 133 134 static void ask(const char *); 135 static void gfrsub(FILE *); 136 static int linecnt(FILE *); 137 static int next(char *); 138 static char *nxtfld(char *); 139 static void onsusp(int); 140 static void onintr(int); 141 static void prmesg(int); 142 static void usage(void); 143 144 int 145 main(int argc, char *argv[]) 146 { 147 bool newrc, already; 148 int rcfirst = 0; /* first message to print (from .rc) */ 149 int rcback = 0; /* amount to back off of rcfirst */ 150 int firstmsg = 0, nextmsg = 0, lastmsg = 0; 151 int blast = 0; 152 struct stat buf; /* stat to check access of bounds */ 153 FILE *bounds; 154 char *cp; 155 156 #ifdef UNBUFFERED 157 setbuf(stdout, NULL); 158 #endif 159 setlocale(LC_ALL, ""); 160 161 time(&t); 162 if (setuid(uid = getuid()) != 0) 163 err(1, "setuid failed"); 164 ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL); 165 if (ruptible) 166 signal(SIGINT, SIG_DFL); 167 168 argc--, argv++; 169 while (argc > 0) { 170 if (isdigit(argv[0][0])) { /* starting message # */ 171 rcfirst = atoi(argv[0]); 172 } 173 else if (isdigit(argv[0][1])) { /* backward offset */ 174 rcback = atoi( &( argv[0][1] ) ); 175 } 176 else { 177 ptr = *argv; 178 while (*ptr) switch (*ptr++) { 179 180 case '-': 181 break; 182 183 case 'c': 184 if (uid != SUPERUSER && uid != DAEMON) 185 errx(1, 186 "only the super-user can use the c flag"); 187 clean = true; 188 break; 189 190 case 'f': /* silently */ 191 hush = true; 192 break; 193 194 case 'h': /* headers only */ 195 hdrs = true; 196 break; 197 198 case 'l': /* local msgs only */ 199 locomode = true; 200 break; 201 202 case 'o': /* option to save last message */ 203 lastcmd = true; 204 break; 205 206 case 'p': /* pipe thru 'more' during long msgs */ 207 use_pager = true; 208 break; 209 210 case 'q': /* query only */ 211 qopt = true; 212 break; 213 214 case 's': /* sending TO msgs */ 215 send_msg = true; 216 break; 217 218 default: 219 usage(); 220 } 221 } 222 argc--, argv++; 223 } 224 225 /* 226 * determine current message bounds 227 */ 228 snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS); 229 230 /* 231 * Test access rights to the bounds file 232 * This can be a little tricky. if(send_msg), then 233 * we will create it. We assume that if(send_msg), 234 * then you have write permission there. 235 * Else, it better be there, or we bail. 236 */ 237 if (!send_msg) { 238 if (stat(fname, &buf) < 0) { 239 if (!hush) { 240 err(errno, "%s", fname); 241 } else { 242 exit(1); 243 } 244 } 245 } 246 bounds = fopen(fname, "r"); 247 248 if (bounds != NULL) { 249 fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg); 250 fclose(bounds); 251 blast = lastmsg; /* save upper bound */ 252 } 253 254 if (clean) 255 keep = t - (rcback? rcback : NDAYS) DAYS; 256 257 if (clean || bounds == NULL) { /* relocate message bounds */ 258 struct dirent *dp; 259 struct stat stbuf; 260 bool seenany = false; 261 DIR *dirp; 262 263 dirp = opendir(_PATH_MSGS); 264 if (dirp == NULL) 265 err(errno, "%s", _PATH_MSGS); 266 267 firstmsg = 32767; 268 lastmsg = 0; 269 270 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){ 271 cp = dp->d_name; 272 int i = 0; 273 274 if (dp->d_ino == 0) 275 continue; 276 if (dp->d_namlen == 0) 277 continue; 278 279 if (clean) 280 snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp); 281 282 while (isdigit(*cp)) 283 i = i * 10 + *cp++ - '0'; 284 if (*cp) 285 continue; /* not a message! */ 286 287 if (clean) { 288 if (stat(inbuf, &stbuf) != 0) 289 continue; 290 if (stbuf.st_mtime < keep 291 && stbuf.st_mode&S_IWRITE) { 292 unlink(inbuf); 293 continue; 294 } 295 } 296 297 if (i > lastmsg) 298 lastmsg = i; 299 if (i < firstmsg) 300 firstmsg = i; 301 seenany = true; 302 } 303 closedir(dirp); 304 305 if (!seenany) { 306 if (blast != 0) /* never lower the upper bound! */ 307 lastmsg = blast; 308 firstmsg = lastmsg + 1; 309 } 310 else if (blast > lastmsg) 311 lastmsg = blast; 312 313 if (!send_msg) { 314 bounds = fopen(fname, "w"); 315 if (bounds == NULL) 316 err(errno, "%s", fname); 317 chmod(fname, CMODE); 318 fprintf(bounds, "%d %d\n", firstmsg, lastmsg); 319 fclose(bounds); 320 } 321 } 322 323 if (send_msg) { 324 /* 325 * Send mode - place msgs in _PATH_MSGS 326 */ 327 bounds = fopen(fname, "w"); 328 if (bounds == NULL) 329 err(errno, "%s", fname); 330 331 nextmsg = lastmsg + 1; 332 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg); 333 newmsg = fopen(fname, "w"); 334 if (newmsg == NULL) 335 err(errno, "%s", fname); 336 chmod(fname, CMODE); 337 338 fprintf(bounds, "%d %d\n", firstmsg, nextmsg); 339 fclose(bounds); 340 341 sending = true; 342 if (ruptible) 343 signal(SIGINT, onintr); 344 345 if (isatty(fileno(stdin))) { 346 ptr = getpwuid(uid)->pw_name; 347 printf("Message %d:\nFrom %s %sSubject: ", 348 nextmsg, ptr, ctime(&t)); 349 fflush(stdout); 350 fgets(inbuf, sizeof inbuf, stdin); 351 putchar('\n'); 352 fflush(stdout); 353 fprintf(newmsg, "From %s %sSubject: %s\n", 354 ptr, ctime(&t), inbuf); 355 blankline = seensubj = true; 356 } 357 else 358 blankline = seensubj = false; 359 for (;;) { 360 fgets(inbuf, sizeof inbuf, stdin); 361 if (feof(stdin) || ferror(stdin)) 362 break; 363 blankline = (blankline || (inbuf[0] == '\n')); 364 seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0))); 365 fputs(inbuf, newmsg); 366 } 367 #ifdef OBJECT 368 if (!seensubj) { 369 printf("NOTICE: Messages should have a Subject field!\n"); 370 #ifdef REJECT 371 unlink(fname); 372 #endif 373 exit(1); 374 } 375 #endif 376 exit(ferror(stdin)); 377 } 378 if (clean) 379 exit(0); 380 381 /* 382 * prepare to display messages 383 */ 384 totty = (isatty(fileno(stdout)) != 0); 385 use_pager = use_pager && totty; 386 387 if ((cp = getenv("HOME")) == NULL || *cp == '\0') { 388 fprintf(stderr, "Error, no home directory!\n"); 389 exit(1); 390 } 391 snprintf(fname, sizeof(fname), "%s/%s", cp, MSGSRC); 392 msgsrc = fopen(fname, "r"); 393 if (msgsrc) { 394 newrc = false; 395 fscanf(msgsrc, "%d\n", &nextmsg); 396 fclose(msgsrc); 397 if (nextmsg > lastmsg+1) { 398 printf("Warning: bounds have been reset (%d, %d)\n", 399 firstmsg, lastmsg); 400 truncate(fname, (off_t)0); 401 newrc = true; 402 } 403 else if (!rcfirst) 404 rcfirst = nextmsg - rcback; 405 } 406 else 407 newrc = true; 408 msgsrc = fopen(fname, "r+"); 409 if (msgsrc == NULL) 410 msgsrc = fopen(fname, "w"); 411 if (msgsrc == NULL) 412 err(errno, "%s", fname); 413 if (rcfirst) { 414 if (rcfirst > lastmsg+1) { 415 printf("Warning: the last message is number %d.\n", 416 lastmsg); 417 rcfirst = nextmsg; 418 } 419 if (rcfirst > firstmsg) 420 firstmsg = rcfirst; /* don't set below first msg */ 421 } 422 if (newrc) { 423 nextmsg = firstmsg; 424 rewind(msgsrc); 425 fprintf(msgsrc, "%d\n", nextmsg); 426 fflush(msgsrc); 427 } 428 429 #ifdef V7 430 if (totty) { 431 struct winsize win; 432 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1) 433 Lpp = win.ws_row; 434 if (Lpp <= 0) { 435 if (tgetent(inbuf, getenv("TERM")) <= 0 436 || (Lpp = tgetnum("li")) <= 0) { 437 Lpp = NLINES; 438 } 439 } 440 } 441 #endif 442 Lpp -= 6; /* for headers, etc. */ 443 444 already = false; 445 prevmsg = firstmsg; 446 printing = true; 447 if (ruptible) 448 signal(SIGINT, onintr); 449 450 /* 451 * Main program loop 452 */ 453 for (msg = firstmsg; msg <= lastmsg; msg++) { 454 455 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg); 456 newmsg = fopen(fname, "r"); 457 if (newmsg == NULL) 458 continue; 459 460 gfrsub(newmsg); /* get From and Subject fields */ 461 if (locomode && !local) { 462 fclose(newmsg); 463 continue; 464 } 465 466 if (qopt) { /* This has to be located here */ 467 printf("There are new messages.\n"); 468 exit(0); 469 } 470 471 if (already && !hdrs) 472 putchar('\n'); 473 474 /* 475 * Print header 476 */ 477 if (totty) 478 signal(SIGTSTP, onsusp); 479 (void) setjmp(tstpbuf); 480 already = true; 481 nlines = 2; 482 if (seenfrom) { 483 printf("Message %d:\nFrom %s %s", msg, from, date); 484 nlines++; 485 } 486 if (seensubj) { 487 printf("Subject: %s", subj); 488 nlines++; 489 } 490 else { 491 if (seenfrom) { 492 putchar('\n'); 493 nlines++; 494 } 495 while (nlines < 6 496 && fgets(inbuf, sizeof inbuf, newmsg) 497 && inbuf[0] != '\n') { 498 fputs(inbuf, stdout); 499 nlines++; 500 } 501 } 502 503 lct = linecnt(newmsg); 504 if (lct) 505 printf("(%d%sline%s) ", lct, seensubj? " " : " more ", 506 (lct == 1) ? "" : "s"); 507 508 if (hdrs) { 509 printf("\n-----\n"); 510 fclose(newmsg); 511 continue; 512 } 513 514 /* 515 * Ask user for command 516 */ 517 if (totty) 518 ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT)); 519 else 520 inbuf[0] = 'y'; 521 if (totty) 522 signal(SIGTSTP, SIG_DFL); 523 cmnd: 524 in = inbuf; 525 switch (*in) { 526 case 'x': 527 /* FALLTHROUGH */ 528 case 'X': 529 exit(0); 530 /* NOTREACHED */ 531 532 case 'q': 533 /* FALLTHROUGH */ 534 case 'Q': 535 quitit = true; 536 printf("--Postponed--\n"); 537 exit(0); 538 /* NOTREACHED */ 539 540 case 'n': 541 /* FALLTHROUGH */ 542 case 'N': 543 if (msg >= nextmsg) sep = "Flushed"; 544 prevmsg = msg; 545 break; 546 547 case 'p': 548 /* FALLTHROUGH */ 549 case 'P': 550 use_pager = (*in++ == 'p'); 551 /* FALLTHROUGH */ 552 case '\n': 553 /* FALLTHROUGH */ 554 case 'y': 555 default: 556 if (*in == '-') { 557 msg = prevmsg-1; 558 sep = "replay"; 559 break; 560 } 561 if (isdigit(*in)) { 562 msg = next(in); 563 sep = in; 564 break; 565 } 566 567 prmesg(nlines + lct + (seensubj? 1 : 0)); 568 prevmsg = msg; 569 570 } 571 572 printf("--%s--\n", sep); 573 sep = "-"; 574 if (msg >= nextmsg) { 575 nextmsg = msg + 1; 576 rewind(msgsrc); 577 fprintf(msgsrc, "%d\n", nextmsg); 578 fflush(msgsrc); 579 } 580 if (newmsg) 581 fclose(newmsg); 582 if (quitit) 583 break; 584 } 585 586 /* 587 * Make sure .rc file gets updated 588 */ 589 if (--msg >= nextmsg) { 590 nextmsg = msg + 1; 591 rewind(msgsrc); 592 fprintf(msgsrc, "%d\n", nextmsg); 593 fflush(msgsrc); 594 } 595 if (already && !quitit && lastcmd && totty) { 596 /* 597 * save or reply to last message? 598 */ 599 msg = prevmsg; 600 ask(NOMORE); 601 if (inbuf[0] == '-' || isdigit(inbuf[0])) 602 goto cmnd; 603 } 604 if (!(already || hush || qopt)) 605 printf("No new messages.\n"); 606 exit(0); 607 /* NOTREACHED */ 608 } 609 610 static void 611 usage(void) 612 { 613 fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n"); 614 exit(1); 615 } 616 617 static void 618 prmesg(int length) 619 { 620 FILE *outf; 621 char *env_pager; 622 623 if (use_pager && length > Lpp) { 624 signal(SIGPIPE, SIG_IGN); 625 signal(SIGQUIT, SIG_IGN); 626 if ((env_pager = getenv("PAGER")) == NULL) { 627 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp); 628 } else { 629 snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager); 630 } 631 outf = popen(cmdbuf, "w"); 632 if (!outf) 633 outf = stdout; 634 else 635 setbuf(outf, (char *)NULL); 636 } 637 else 638 outf = stdout; 639 640 if (seensubj) 641 putc('\n', outf); 642 643 while (fgets(inbuf, sizeof inbuf, newmsg)) { 644 fputs(inbuf, outf); 645 if (ferror(outf)) { 646 clearerr(outf); 647 break; 648 } 649 } 650 651 if (outf != stdout) { 652 pclose(outf); 653 signal(SIGPIPE, SIG_DFL); 654 signal(SIGQUIT, SIG_DFL); 655 } 656 else { 657 fflush(stdout); 658 } 659 660 /* force wait on output */ 661 tcdrain(fileno(stdout)); 662 } 663 664 static void 665 onintr(int unused __unused) 666 { 667 signal(SIGINT, onintr); 668 if (mailing) 669 unlink(fname); 670 if (sending) { 671 unlink(fname); 672 puts("--Killed--"); 673 exit(1); 674 } 675 if (printing) { 676 putchar('\n'); 677 if (hdrs) 678 exit(0); 679 sep = "Interrupt"; 680 if (newmsg) 681 fseeko(newmsg, (off_t)0, SEEK_END); 682 intrpflg = true; 683 } 684 } 685 686 /* 687 * We have just gotten a susp. Suspend and prepare to resume. 688 */ 689 static void 690 onsusp(int unused __unused) 691 { 692 signal(SIGTSTP, SIG_DFL); 693 sigsetmask(0); 694 kill(0, SIGTSTP); 695 signal(SIGTSTP, onsusp); 696 if (!mailing) 697 longjmp(tstpbuf, 0); 698 } 699 700 static int 701 linecnt(FILE *f) 702 { 703 off_t oldpos = ftello(f); 704 int l = 0; 705 char lbuf[BUFSIZ]; 706 707 while (fgets(lbuf, sizeof lbuf, f)) 708 l++; 709 clearerr(f); 710 fseeko(f, oldpos, SEEK_SET); 711 return (l); 712 } 713 714 static int 715 next(char *buf) 716 { 717 int i; 718 sscanf(buf, "%d", &i); 719 sprintf(buf, "Goto %d", i); 720 return(--i); 721 } 722 723 static void 724 ask(const char *prompt) 725 { 726 char inch; 727 int n, cmsg, fd; 728 off_t oldpos; 729 FILE *cpfrom, *cpto; 730 731 printf("%s ", prompt); 732 fflush(stdout); 733 intrpflg = false; 734 (void) fgets(inbuf, sizeof inbuf, stdin); 735 if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n') 736 inbuf[n - 1] = '\0'; 737 if (intrpflg) 738 inbuf[0] = 'x'; 739 740 /* 741 * Handle 'mail' and 'save' here. 742 */ 743 if ((inch = inbuf[0]) == 's' || inch == 'm') { 744 if (inbuf[1] == '-') 745 cmsg = prevmsg; 746 else if (isdigit(inbuf[1])) 747 cmsg = atoi(&inbuf[1]); 748 else 749 cmsg = msg; 750 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg); 751 752 oldpos = ftello(newmsg); 753 754 cpfrom = fopen(fname, "r"); 755 if (!cpfrom) { 756 printf("Message %d not found\n", cmsg); 757 ask (prompt); 758 return; 759 } 760 761 if (inch == 's') { 762 in = nxtfld(inbuf); 763 if (*in) { 764 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */ 765 fname[n] = in[n]; 766 } 767 fname[n] = '\0'; 768 } 769 else 770 strcpy(fname, "Messages"); 771 fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND); 772 } 773 else { 774 strcpy(fname, _PATH_TMP); 775 fd = mkstemp(fname); 776 if (fd != -1) { 777 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL, 778 fname); 779 mailing = true; 780 } 781 } 782 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) { 783 if (fd != -1) 784 close(fd); 785 warn("%s", fname); 786 mailing = false; 787 fseeko(newmsg, oldpos, SEEK_SET); 788 ask(prompt); 789 fclose(cpfrom); 790 return; 791 } 792 793 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom))) 794 fwrite(inbuf, 1, n, cpto); 795 796 fclose(cpfrom); 797 fclose(cpto); 798 fseeko(newmsg, oldpos, SEEK_SET);/* reposition current message */ 799 if (inch == 's') 800 printf("Message %d saved in \"%s\"\n", cmsg, fname); 801 else { 802 system(cmdbuf); 803 unlink(fname); 804 mailing = false; 805 } 806 ask(prompt); 807 } 808 } 809 810 static void 811 gfrsub(FILE *infile) 812 { 813 off_t frompos; 814 int count; 815 816 seensubj = seenfrom = false; 817 local = true; 818 subj[0] = from[0] = date[0] = '\0'; 819 820 /* 821 * Is this a normal message? 822 */ 823 if (fgets(inbuf, sizeof inbuf, infile)) { 824 if (strncmp(inbuf, "From", 4)==0) { 825 /* 826 * expected form starts with From 827 */ 828 seenfrom = true; 829 frompos = ftello(infile); 830 ptr = from; 831 in = nxtfld(inbuf); 832 if (*in) { 833 count = sizeof(from) - 1; 834 while (*in && *in > ' ' && count-- > 0) { 835 if (*in == ':' || *in == '@' || 836 *in == '!') 837 local = false; 838 *ptr++ = *in++; 839 } 840 } 841 *ptr = '\0'; 842 if (*(in = nxtfld(in))) 843 strlcpy(date, in, sizeof date); 844 else { 845 date[0] = '\n'; 846 date[1] = '\0'; 847 } 848 } 849 else { 850 /* 851 * not the expected form 852 */ 853 rewind(infile); 854 return; 855 } 856 } 857 else 858 /* 859 * empty file ? 860 */ 861 return; 862 863 /* 864 * look for Subject line until EOF or a blank line 865 */ 866 while (fgets(inbuf, sizeof inbuf, infile) 867 && !(blankline = (inbuf[0] == '\n'))) { 868 /* 869 * extract Subject line 870 */ 871 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) { 872 seensubj = true; 873 frompos = ftello(infile); 874 strlcpy(subj, nxtfld(inbuf), sizeof subj); 875 } 876 } 877 if (!blankline) 878 /* 879 * ran into EOF 880 */ 881 fseeko(infile, frompos, SEEK_SET); 882 883 if (!seensubj) 884 /* 885 * for possible use with Mail 886 */ 887 strlcpy(subj, "(No Subject)\n", sizeof subj); 888 } 889 890 static char * 891 nxtfld(char *s) 892 { 893 if (*s) while (*s && !isspace(*s)) s++; /* skip over this field */ 894 if (*s) while (*s && isspace(*s)) s++; /* find start of next field */ 895 return (s); 896 } 897