msgs.c revision 1.6
1 /*- 2 * Copyright (c) 1980 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 char copyright[] = 36 "@(#) Copyright (c) 1980 The Regents of the University of California.\n\ 37 All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)msgs.c 5.8 (Berkeley) 2/4/91";*/ 42 static char rcsid[] = "$Id: msgs.c,v 1.6 1994/02/19 09:11:33 cgd Exp $"; 43 #endif /* not lint */ 44 45 /* 46 * msgs - a user bulletin board program 47 * 48 * usage: 49 * msgs [fhlopqr] [[-]number] to read messages 50 * msgs -s to place messages 51 * msgs -c [-days] to clean up the bulletin board 52 * 53 * prompt commands are: 54 * y print message 55 * n flush message, go to next message 56 * q flush message, quit 57 * p print message, turn on 'pipe thru more' mode 58 * P print message, turn off 'pipe thru more' mode 59 * - reprint last message 60 * s[-][<num>] [<filename>] save message 61 * m[-][<num>] mail with message in temp mbox 62 * x exit without flushing this message 63 * <num> print message number <num> 64 */ 65 66 #define V7 /* will look for TERM in the environment */ 67 #define OBJECT /* will object to messages without Subjects */ 68 #define REJECT /* will reject messages without Subjects 69 (OBJECT must be defined also) */ 70 /* #define UNBUFFERED /* use unbuffered output */ 71 72 #include <sys/param.h> 73 #include <sys/stat.h> 74 #include <dirent.h> 75 #include <ctype.h> 76 #include <errno.h> 77 #include <pwd.h> 78 #include <setjmp.h> 79 #include <sgtty.h> 80 #include <signal.h> 81 #include <stdio.h> 82 #include <stdlib.h> 83 #include <string.h> 84 #include <time.h> 85 #include <unistd.h> 86 #include "pathnames.h" 87 88 #define CMODE 0664 /* bounds file creation mode */ 89 #define NO 0 90 #define YES 1 91 #define SUPERUSER 0 /* superuser uid */ 92 #define DAEMON 1 /* daemon uid */ 93 #define NLINES 24 /* default number of lines/crt screen */ 94 #define NDAYS 21 /* default keep time for messages */ 95 #define DAYS *24*60*60 /* seconds/day */ 96 #define MSGSRC ".msgsrc" /* user's rc file */ 97 #define BOUNDS "bounds" /* message bounds file */ 98 #define NEXT "Next message? [yq]" 99 #define MORE "More? [ynq]" 100 #define NOMORE "(No more) [q] ?" 101 102 typedef char bool; 103 104 FILE *msgsrc; 105 FILE *newmsg; 106 char *sep = "-"; 107 char inbuf[BUFSIZ]; 108 char fname[128]; 109 char cmdbuf[128]; 110 char subj[128]; 111 char from[128]; 112 char date[128]; 113 char *ptr; 114 char *in; 115 bool local; 116 bool ruptible; 117 bool totty; 118 bool seenfrom; 119 bool seensubj; 120 bool blankline; 121 bool printing = NO; 122 bool mailing = NO; 123 bool quitit = NO; 124 bool sending = NO; 125 bool intrpflg = NO; 126 int uid; 127 int msg; 128 int prevmsg; 129 int lct; 130 int nlines; 131 int Lpp = 0; 132 time_t t; 133 time_t keep; 134 struct sgttyb otty; 135 136 char *mktemp(); 137 char *nxtfld(); 138 void onintr(); 139 void onsusp(); 140 141 /* option initialization */ 142 bool hdrs = NO; 143 bool qopt = NO; 144 bool hush = NO; 145 bool send_msg = NO; 146 bool locomode = NO; 147 bool use_pager = NO; 148 bool clean = NO; 149 bool lastcmd = NO; 150 bool restricted = NO; 151 jmp_buf tstpbuf; 152 153 main(argc, argv) 154 int argc; char *argv[]; 155 { 156 bool newrc, already; 157 int rcfirst = 0; /* first message to print (from .rc) */ 158 int rcback = 0; /* amount to back off of rcfirst */ 159 int firstmsg, nextmsg, lastmsg = 0; 160 int blast = 0; 161 FILE *bounds; 162 163 #ifdef UNBUFFERED 164 setbuf(stdout, NULL); 165 #endif 166 167 gtty(fileno(stdout), &otty); 168 time(&t); 169 setuid(uid = getuid()); 170 ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL); 171 if (ruptible) 172 signal(SIGINT, SIG_DFL); 173 174 argc--, argv++; 175 while (argc > 0) { 176 if (isdigit(argv[0][0])) { /* starting message # */ 177 rcfirst = atoi(argv[0]); 178 } 179 else if (isdigit(argv[0][1])) { /* backward offset */ 180 rcback = atoi( &( argv[0][1] ) ); 181 } 182 else { 183 ptr = *argv; 184 while (*ptr) switch (*ptr++) { 185 186 case '-': 187 break; 188 189 case 'c': 190 if (uid != SUPERUSER && uid != DAEMON) { 191 fprintf(stderr, "Sorry\n"); 192 exit(1); 193 } 194 clean = YES; 195 break; 196 197 case 'f': /* silently */ 198 hush = YES; 199 break; 200 201 case 'h': /* headers only */ 202 hdrs = YES; 203 break; 204 205 case 'l': /* local msgs only */ 206 locomode = YES; 207 break; 208 209 case 'o': /* option to save last message */ 210 lastcmd = YES; 211 break; 212 213 case 'p': /* pipe thru 'more' during long msgs */ 214 use_pager = YES; 215 break; 216 217 case 'q': /* query only */ 218 qopt = YES; 219 break; 220 221 case 'r': /* restricted */ 222 restricted = YES; 223 break; 224 225 case 's': /* sending TO msgs */ 226 send_msg = YES; 227 break; 228 229 default: 230 fprintf(stderr, 231 "usage: msgs [fhlopqr] [[-]number]\n"); 232 exit(1); 233 } 234 } 235 argc--, argv++; 236 } 237 238 /* 239 * determine current message bounds 240 */ 241 sprintf(fname, "%s/%s", _PATH_MSGS, BOUNDS); 242 bounds = fopen(fname, "r"); 243 244 if (bounds != NULL) { 245 fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg); 246 fclose(bounds); 247 blast = lastmsg; /* save upper bound */ 248 } 249 250 if (clean) 251 keep = t - (rcback? rcback : NDAYS) DAYS; 252 253 if (clean || bounds == NULL) { /* relocate message bounds */ 254 struct dirent *dp; 255 struct stat stbuf; 256 bool seenany = NO; 257 DIR *dirp; 258 259 dirp = opendir(_PATH_MSGS); 260 if (dirp == NULL) { 261 perror(_PATH_MSGS); 262 exit(errno); 263 } 264 265 firstmsg = 32767; 266 lastmsg = 0; 267 268 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){ 269 register char *cp = dp->d_name; 270 register int i = 0; 271 272 if (dp->d_ino == 0) 273 continue; 274 if (dp->d_namlen == 0) 275 continue; 276 277 if (clean) 278 sprintf(inbuf, "%s/%s", _PATH_MSGS, cp); 279 280 while (isdigit(*cp)) 281 i = i * 10 + *cp++ - '0'; 282 if (*cp) 283 continue; /* not a message! */ 284 285 if (clean) { 286 if (stat(inbuf, &stbuf) != 0) 287 continue; 288 if (stbuf.st_mtime < keep 289 && stbuf.st_mode&S_IWRITE) { 290 unlink(inbuf); 291 continue; 292 } 293 } 294 295 if (i > lastmsg) 296 lastmsg = i; 297 if (i < firstmsg) 298 firstmsg = i; 299 seenany = YES; 300 } 301 closedir(dirp); 302 303 if (!seenany) { 304 if (blast != 0) /* never lower the upper bound! */ 305 lastmsg = blast; 306 firstmsg = lastmsg + 1; 307 } 308 else if (blast > lastmsg) 309 lastmsg = blast; 310 311 if (!send_msg) { 312 bounds = fopen(fname, "w"); 313 if (bounds == NULL) { 314 perror(fname); 315 exit(errno); 316 } 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 perror(fname); 330 exit(errno); 331 } 332 chmod(fname, CMODE); 333 334 nextmsg = lastmsg + 1; 335 sprintf(fname, "%s/%d", _PATH_MSGS, nextmsg); 336 newmsg = fopen(fname, "w"); 337 if (newmsg == NULL) { 338 perror(fname); 339 exit(errno); 340 } 341 chmod(fname, 0644); 342 343 fprintf(bounds, "%d %d\n", firstmsg, nextmsg); 344 fclose(bounds); 345 346 sending = YES; 347 if (ruptible) 348 signal(SIGINT, onintr); 349 350 if (isatty(fileno(stdin))) { 351 ptr = getpwuid(uid)->pw_name; 352 printf("Message %d:\nFrom %s %sSubject: ", 353 nextmsg, ptr, ctime(&t)); 354 fflush(stdout); 355 fgets(inbuf, sizeof inbuf, stdin); 356 putchar('\n'); 357 fflush(stdout); 358 fprintf(newmsg, "From %s %sSubject: %s\n", 359 ptr, ctime(&t), inbuf); 360 blankline = seensubj = YES; 361 } 362 else 363 blankline = seensubj = NO; 364 for (;;) { 365 fgets(inbuf, sizeof inbuf, stdin); 366 if (feof(stdin) || ferror(stdin)) 367 break; 368 blankline = (blankline || (inbuf[0] == '\n')); 369 seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0))); 370 fputs(inbuf, newmsg); 371 } 372 #ifdef OBJECT 373 if (!seensubj) { 374 printf("NOTICE: Messages should have a Subject field!\n"); 375 #ifdef REJECT 376 unlink(fname); 377 #endif 378 exit(1); 379 } 380 #endif 381 exit(ferror(stdin)); 382 } 383 if (clean) 384 exit(0); 385 386 /* 387 * prepare to display messages 388 */ 389 totty = (isatty(fileno(stdout)) != 0); 390 use_pager = use_pager && totty; 391 392 sprintf(fname, "%s/%s", getenv("HOME"), MSGSRC); 393 msgsrc = fopen(fname, "r"); 394 if (msgsrc) { 395 newrc = NO; 396 fscanf(msgsrc, "%d\n", &nextmsg); 397 fclose(msgsrc); 398 if (nextmsg > lastmsg+1) { 399 printf("Warning: bounds have been reset (%d, %d)\n", 400 firstmsg, lastmsg); 401 truncate(fname, (off_t)0); 402 newrc = YES; 403 } 404 else if (!rcfirst) 405 rcfirst = nextmsg - rcback; 406 } 407 else 408 newrc = YES; 409 msgsrc = fopen(fname, "r+"); 410 if (msgsrc == NULL) 411 msgsrc = fopen(fname, "w"); 412 if (msgsrc == NULL) { 413 perror(fname); 414 exit(errno); 415 } 416 if (rcfirst) { 417 if (rcfirst > lastmsg+1) { 418 printf("Warning: the last message is number %d.\n", 419 lastmsg); 420 rcfirst = nextmsg; 421 } 422 if (rcfirst > firstmsg) 423 firstmsg = rcfirst; /* don't set below first msg */ 424 } 425 if (newrc) { 426 nextmsg = firstmsg; 427 fseek(msgsrc, 0L, 0); 428 fprintf(msgsrc, "%d\n", nextmsg); 429 fflush(msgsrc); 430 } 431 432 #ifdef V7 433 if (totty) { 434 struct winsize win; 435 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1) 436 Lpp = win.ws_row; 437 if (Lpp <= 0) { 438 if (tgetent(inbuf, getenv("TERM")) <= 0 439 || (Lpp = tgetnum("li")) <= 0) { 440 Lpp = NLINES; 441 } 442 } 443 } 444 #endif 445 Lpp -= 6; /* for headers, etc. */ 446 447 already = NO; 448 prevmsg = firstmsg; 449 printing = YES; 450 if (ruptible) 451 signal(SIGINT, onintr); 452 453 /* 454 * Main program loop 455 */ 456 for (msg = firstmsg; msg <= lastmsg; msg++) { 457 458 sprintf(fname, "%s/%d", _PATH_MSGS, msg); 459 newmsg = fopen(fname, "r"); 460 if (newmsg == NULL) 461 continue; 462 463 gfrsub(newmsg); /* get From and Subject fields */ 464 if (locomode && !local) { 465 fclose(newmsg); 466 continue; 467 } 468 469 if (qopt) { /* This has to be located here */ 470 printf("There are new messages.\n"); 471 exit(0); 472 } 473 474 if (already && !hdrs) 475 putchar('\n'); 476 477 /* 478 * Print header 479 */ 480 if (totty) 481 signal(SIGTSTP, onsusp); 482 (void) setjmp(tstpbuf); 483 already = YES; 484 nlines = 2; 485 if (seenfrom) { 486 printf("Message %d:\nFrom %s %s", msg, from, date); 487 nlines++; 488 } 489 if (seensubj) { 490 printf("Subject: %s", subj); 491 nlines++; 492 } 493 else { 494 if (seenfrom) { 495 putchar('\n'); 496 nlines++; 497 } 498 while (nlines < 6 499 && fgets(inbuf, sizeof inbuf, newmsg) 500 && inbuf[0] != '\n') { 501 fputs(inbuf, stdout); 502 nlines++; 503 } 504 } 505 506 lct = linecnt(newmsg); 507 if (lct) 508 printf("(%d%slines) ", lct, seensubj? " " : " more "); 509 510 if (hdrs) { 511 printf("\n-----\n"); 512 fclose(newmsg); 513 continue; 514 } 515 516 /* 517 * Ask user for command 518 */ 519 if (totty) 520 ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT)); 521 else 522 inbuf[0] = 'y'; 523 if (totty) 524 signal(SIGTSTP, SIG_DFL); 525 cmnd: 526 in = inbuf; 527 switch (*in) { 528 case 'x': 529 case 'X': 530 exit(0); 531 532 case 'q': 533 case 'Q': 534 quitit = YES; 535 printf("--Postponed--\n"); 536 exit(0); 537 /* intentional fall-thru */ 538 case 'n': 539 case 'N': 540 if (msg >= nextmsg) sep = "Flushed"; 541 prevmsg = msg; 542 break; 543 544 case 'p': 545 case 'P': 546 use_pager = (*in++ == 'p'); 547 /* intentional fallthru */ 548 case '\n': 549 case 'y': 550 default: 551 if (*in == '-') { 552 msg = prevmsg-1; 553 sep = "replay"; 554 break; 555 } 556 if (isdigit(*in)) { 557 msg = next(in); 558 sep = in; 559 break; 560 } 561 562 prmesg(nlines + lct + (seensubj? 1 : 0)); 563 prevmsg = msg; 564 565 } 566 567 printf("--%s--\n", sep); 568 sep = "-"; 569 if (msg >= nextmsg) { 570 nextmsg = msg + 1; 571 fseek(msgsrc, 0L, 0); 572 fprintf(msgsrc, "%d\n", nextmsg); 573 fflush(msgsrc); 574 } 575 if (newmsg) 576 fclose(newmsg); 577 if (quitit) 578 break; 579 } 580 581 /* 582 * Make sure .rc file gets updated 583 */ 584 if (--msg >= nextmsg) { 585 nextmsg = msg + 1; 586 fseek(msgsrc, 0L, 0); 587 fprintf(msgsrc, "%d\n", nextmsg); 588 fflush(msgsrc); 589 } 590 if (already && !quitit && lastcmd && totty) { 591 /* 592 * save or reply to last message? 593 */ 594 msg = prevmsg; 595 ask(NOMORE); 596 if (inbuf[0] == '-' || isdigit(inbuf[0])) 597 goto cmnd; 598 } 599 if (!(already || hush || qopt)) 600 printf("No new messages.\n"); 601 exit(0); 602 } 603 604 prmesg(length) 605 int length; 606 { 607 FILE *outf; 608 char *env_pager; 609 610 if (use_pager && length > Lpp) { 611 signal(SIGPIPE, SIG_IGN); 612 signal(SIGQUIT, SIG_IGN); 613 if ((env_pager = getenv("PAGER")) == NULL) { 614 sprintf(cmdbuf, _PATH_PAGER, Lpp); 615 } else { 616 strcpy(cmdbuf, env_pager); 617 } 618 outf = popen(cmdbuf, "w"); 619 if (!outf) 620 outf = stdout; 621 else 622 setbuf(outf, (char *)NULL); 623 } 624 else 625 outf = stdout; 626 627 if (seensubj) 628 putc('\n', outf); 629 630 while (fgets(inbuf, sizeof inbuf, newmsg)) { 631 fputs(inbuf, outf); 632 if (ferror(outf)) { 633 clearerr(outf); 634 break; 635 } 636 } 637 638 if (outf != stdout) { 639 pclose(outf); 640 signal(SIGPIPE, SIG_DFL); 641 signal(SIGQUIT, SIG_DFL); 642 } 643 else { 644 fflush(stdout); 645 } 646 647 /* trick to force wait on output */ 648 stty(fileno(stdout), &otty); 649 } 650 651 void 652 onintr() 653 { 654 signal(SIGINT, onintr); 655 if (mailing) 656 unlink(fname); 657 if (sending) { 658 unlink(fname); 659 puts("--Killed--"); 660 exit(1); 661 } 662 if (printing) { 663 putchar('\n'); 664 if (hdrs) 665 exit(0); 666 sep = "Interrupt"; 667 if (newmsg) 668 fseek(newmsg, 0L, 2); 669 intrpflg = YES; 670 } 671 } 672 673 /* 674 * We have just gotten a susp. Suspend and prepare to resume. 675 */ 676 void 677 onsusp() 678 { 679 680 signal(SIGTSTP, SIG_DFL); 681 sigsetmask(0); 682 kill(0, SIGTSTP); 683 signal(SIGTSTP, onsusp); 684 if (!mailing) 685 longjmp(tstpbuf, 0); 686 } 687 688 linecnt(f) 689 FILE *f; 690 { 691 off_t oldpos = ftell(f); 692 int l = 0; 693 char lbuf[BUFSIZ]; 694 695 while (fgets(lbuf, sizeof lbuf, f)) 696 l++; 697 clearerr(f); 698 fseek(f, oldpos, 0); 699 return (l); 700 } 701 702 next(buf) 703 char *buf; 704 { 705 int i; 706 sscanf(buf, "%d", &i); 707 sprintf(buf, "Goto %d", i); 708 return(--i); 709 } 710 711 ask(prompt) 712 char *prompt; 713 { 714 char inch; 715 int n, cmsg; 716 off_t oldpos; 717 FILE *cpfrom, *cpto; 718 719 printf("%s ", prompt); 720 fflush(stdout); 721 intrpflg = NO; 722 (void) fgets(inbuf, sizeof inbuf, stdin); 723 if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n') 724 inbuf[n - 1] = '\0'; 725 if (intrpflg) 726 inbuf[0] = 'x'; 727 728 /* 729 * Handle 'mail' and 'save' here. 730 */ 731 if (((inch = inbuf[0]) == 's' || inch == 'm') && !restricted) { 732 if (inbuf[1] == '-') 733 cmsg = prevmsg; 734 else if (isdigit(inbuf[1])) 735 cmsg = atoi(&inbuf[1]); 736 else 737 cmsg = msg; 738 sprintf(fname, "%s/%d", _PATH_MSGS, cmsg); 739 740 oldpos = ftell(newmsg); 741 742 cpfrom = fopen(fname, "r"); 743 if (!cpfrom) { 744 printf("Message %d not found\n", cmsg); 745 ask (prompt); 746 return; 747 } 748 749 if (inch == 's') { 750 in = nxtfld(inbuf); 751 if (*in) { 752 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */ 753 fname[n] = in[n]; 754 } 755 fname[n] = NULL; 756 } 757 else 758 strcpy(fname, "Messages"); 759 } 760 else { 761 strcpy(fname, _PATH_TMP); 762 mktemp(fname); 763 sprintf(cmdbuf, _PATH_MAIL, fname); 764 mailing = YES; 765 } 766 cpto = fopen(fname, "a"); 767 if (!cpto) { 768 perror(fname); 769 mailing = NO; 770 fseek(newmsg, oldpos, 0); 771 ask(prompt); 772 return; 773 } 774 775 while (n = fread(inbuf, 1, sizeof inbuf, cpfrom)) 776 fwrite(inbuf, 1, n, cpto); 777 778 fclose(cpfrom); 779 fclose(cpto); 780 fseek(newmsg, oldpos, 0); /* reposition current message */ 781 if (inch == 's') 782 printf("Message %d saved in \"%s\"\n", cmsg, fname); 783 else { 784 system(cmdbuf); 785 unlink(fname); 786 mailing = NO; 787 } 788 ask(prompt); 789 } 790 } 791 792 gfrsub(infile) 793 FILE *infile; 794 { 795 off_t frompos; 796 797 seensubj = seenfrom = NO; 798 local = YES; 799 subj[0] = from[0] = date[0] = NULL; 800 801 /* 802 * Is this a normal message? 803 */ 804 if (fgets(inbuf, sizeof inbuf, infile)) { 805 if (strncmp(inbuf, "From", 4)==0) { 806 /* 807 * expected form starts with From 808 */ 809 seenfrom = YES; 810 frompos = ftell(infile); 811 ptr = from; 812 in = nxtfld(inbuf); 813 if (*in) while (*in && *in > ' ') { 814 if (*in == ':' || *in == '@' || *in == '!') 815 local = NO; 816 *ptr++ = *in++; 817 /* what about sizeof from ? */ 818 } 819 *ptr = NULL; 820 if (*(in = nxtfld(in))) 821 strncpy(date, in, sizeof date); 822 else { 823 date[0] = '\n'; 824 date[1] = NULL; 825 } 826 } 827 else { 828 /* 829 * not the expected form 830 */ 831 fseek(infile, 0L, 0); 832 return; 833 } 834 } 835 else 836 /* 837 * empty file ? 838 */ 839 return; 840 841 /* 842 * look for Subject line until EOF or a blank line 843 */ 844 while (fgets(inbuf, sizeof inbuf, infile) 845 && !(blankline = (inbuf[0] == '\n'))) { 846 /* 847 * extract Subject line 848 */ 849 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) { 850 seensubj = YES; 851 frompos = ftell(infile); 852 strncpy(subj, nxtfld(inbuf), sizeof subj); 853 } 854 } 855 if (!blankline) 856 /* 857 * ran into EOF 858 */ 859 fseek(infile, frompos, 0); 860 861 if (!seensubj) 862 /* 863 * for possible use with Mail 864 */ 865 strncpy(subj, "(No Subject)\n", sizeof subj); 866 } 867 868 char * 869 nxtfld(s) 870 char *s; 871 { 872 if (*s) while (*s && *s > ' ') s++; /* skip over this field */ 873 if (*s) while (*s && *s <= ' ') s++; /* find start of next field */ 874 return (s); 875 } 876
Indexes created Tue Sep 23 07:09:52 GMT 2025