1 /*- 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. 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 static const char copyright[] = 36 "@(#) Copyright (c) 1980, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)msgs.c 8.2 (Berkeley) 4/28/95"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 /* 49 * msgs - a user bulletin board program 50 * 51 * usage: 52 * msgs [fhlopq] [[-]number] to read messages 53 * msgs -s to place messages 54 * msgs -c [-days] to clean up the bulletin board 55 * 56 * prompt commands are: 57 * y print message 58 * n flush message, go to next message 59 * q flush message, quit 60 * p print message, turn on 'pipe thru more' mode 61 * P print message, turn off 'pipe thru more' mode 62 * - reprint last message 63 * s[-][<num>] [<filename>] save message 64 * m[-][<num>] mail with message in temp mbox 65 * x exit without flushing this message 66 * <num> print message number <num> 67 */ 68 69 #define V7 /* will look for TERM in the environment */ 70 #define OBJECT /* will object to messages without Subjects */ 71 /* #define REJECT */ /* will reject messages without Subjects 72 (OBJECT must be defined also) */ 73 /* #define UNBUFFERED *//* use unbuffered output */ 74 75 #include <sys/param.h> 76 #include <sys/stat.h> 77 #include <ctype.h> 78 #include <dirent.h> 79 #include <err.h> 80 #include <errno.h> 81 #include <fcntl.h> 82 #include <locale.h> 83 #include <pwd.h> 84 #include <setjmp.h> 85 #include <termcap.h> 86 #include <termios.h> 87 #include <signal.h> 88 #include <stdio.h> 89 #include <stdlib.h> 90 #include <string.h> 91 #include <time.h> 92 #include <unistd.h> 93 #include "pathnames.h" 94 95 #define CMODE 0644 /* bounds file creation mode */ 96 #define NO 0 97 #define YES 1 98 #define SUPERUSER 0 /* superuser uid */ 99 #define DAEMON 1 /* daemon uid */ 100 #define NLINES 24 /* default number of lines/crt screen */ 101 #define NDAYS 21 /* default keep time for messages */ 102 #define DAYS *24*60*60 /* seconds/day */ 103 #define MSGSRC ".msgsrc" /* user's rc file */ 104 #define BOUNDS "bounds" /* message bounds file */ 105 #define NEXT "Next message? [yq]" 106 #define MORE "More? [ynq]" 107 #define NOMORE "(No more) [q] ?" 108 109 typedef char bool; 110 111 FILE *msgsrc; 112 FILE *newmsg; 113 const char *sep = "-"; 114 char inbuf[BUFSIZ]; 115 char fname[MAXPATHLEN]; 116 char cmdbuf[MAXPATHLEN + MAXPATHLEN]; 117 char subj[128]; 118 char from[128]; 119 char date[128]; 120 char *ptr; 121 char *in; 122 bool local; 123 bool ruptible; 124 bool totty; 125 bool seenfrom; 126 bool seensubj; 127 bool blankline; 128 bool printing = NO; 129 bool mailing = NO; 130 bool quitit = NO; 131 bool sending = NO; 132 bool intrpflg = NO; 133 int uid; 134 int msg; 135 int prevmsg; 136 int lct; 137 int nlines; 138 int Lpp = 0; 139 time_t t; 140 time_t keep; 141 142 /* option initialization */ 143 bool hdrs = NO; 144 bool qopt = NO; 145 bool hush = NO; 146 bool send_msg = NO; 147 bool locomode = NO; 148 bool use_pager = NO; 149 bool clean = NO; 150 bool lastcmd = NO; 151 jmp_buf tstpbuf; 152 153 154 void ask __P((const char *)); 155 void gfrsub __P((FILE *)); 156 int linecnt __P((FILE *)); 157 int main __P((int, char *[])); 158 int next __P((char *)); 159 char *nxtfld __P((unsigned char *)); 160 void onsusp __P((int)); 161 void onintr __P((int)); 162 void prmesg __P((int)); 163 static void usage __P((void)); 164 165 int 166 main(argc, argv) 167 int argc; char *argv[]; 168 { 169 bool newrc, already; 170 int rcfirst = 0; /* first message to print (from .rc) */ 171 int rcback = 0; /* amount to back off of rcfirst */ 172 int firstmsg = 0, nextmsg = 0, lastmsg = 0; 173 int blast = 0; 174 struct stat buf; /* stat to check access of bounds */ 175 FILE *bounds; 176 177 #ifdef UNBUFFERED 178 setbuf(stdout, NULL); 179 #endif 180 setlocale(LC_ALL, ""); 181 182 time(&t); 183 setuid(uid = getuid()); 184 ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL); 185 if (ruptible) 186 signal(SIGINT, SIG_DFL); 187 188 argc--, argv++; 189 while (argc > 0) { 190 if (isdigit(argv[0][0])) { /* starting message # */ 191 rcfirst = atoi(argv[0]); 192 } 193 else if (isdigit(argv[0][1])) { /* backward offset */ 194 rcback = atoi( &( argv[0][1] ) ); 195 } 196 else { 197 ptr = *argv; 198 while (*ptr) switch (*ptr++) { 199 200 case '-': 201 break; 202 203 case 'c': 204 if (uid != SUPERUSER && uid != DAEMON) { 205 fprintf(stderr, "Sorry\n"); 206 exit(1); 207 } 208 clean = YES; 209 break; 210 211 case 'f': /* silently */ 212 hush = YES; 213 break; 214 215 case 'h': /* headers only */ 216 hdrs = YES; 217 break; 218 219 case 'l': /* local msgs only */ 220 locomode = YES; 221 break; 222 223 case 'o': /* option to save last message */ 224 lastcmd = YES; 225 break; 226 227 case 'p': /* pipe thru 'more' during long msgs */ 228 use_pager = YES; 229 break; 230 231 case 'q': /* query only */ 232 qopt = YES; 233 break; 234 235 case 's': /* sending TO msgs */ 236 send_msg = YES; 237 break; 238 239 default: 240 usage(); 241 } 242 } 243 argc--, argv++; 244 } 245 246 /* 247 * determine current message bounds 248 */ 249 snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS); 250 251 /* 252 * Test access rights to the bounds file 253 * This can be a little tricky. if(send_msg), then 254 * we will create it. We assume that if(send_msg), 255 * then you have write permission there. 256 * Else, it better be there, or we bail. 257 */ 258 if (send_msg != YES) { 259 if (stat(fname, &buf) < 0) { 260 if (hush != YES) { 261 err(errno, "%s", fname); 262 } else { 263 exit(1); 264 } 265 } 266 } 267 bounds = fopen(fname, "r"); 268 269 if (bounds != NULL) { 270 fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg); 271 fclose(bounds); 272 blast = lastmsg; /* save upper bound */ 273 } 274 275 if (clean) 276 keep = t - (rcback? rcback : NDAYS) DAYS; 277 278 if (clean || bounds == NULL) { /* relocate message bounds */ 279 struct dirent *dp; 280 struct stat stbuf; 281 bool seenany = NO; 282 DIR *dirp; 283 284 dirp = opendir(_PATH_MSGS); 285 if (dirp == NULL) 286 err(errno, "%s", _PATH_MSGS); 287 288 firstmsg = 32767; 289 lastmsg = 0; 290 291 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){ 292 register char *cp = dp->d_name; 293 register int i = 0; 294 295 if (dp->d_ino == 0) 296 continue; 297 if (dp->d_namlen == 0) 298 continue; 299 300 if (clean) 301 snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp); 302 303 while (isdigit(*cp)) 304 i = i * 10 + *cp++ - '0'; 305 if (*cp) 306 continue; /* not a message! */ 307 308 if (clean) { 309 if (stat(inbuf, &stbuf) != 0) 310 continue; 311 if (stbuf.st_mtime < keep 312 && stbuf.st_mode&S_IWRITE) { 313 unlink(inbuf); 314 continue; 315 } 316 } 317 318 if (i > lastmsg) 319 lastmsg = i; 320 if (i < firstmsg) 321 firstmsg = i; 322 seenany = YES; 323 } 324 closedir(dirp); 325 326 if (!seenany) { 327 if (blast != 0) /* never lower the upper bound! */ 328 lastmsg = blast; 329 firstmsg = lastmsg + 1; 330 } 331 else if (blast > lastmsg) 332 lastmsg = blast; 333 334 if (!send_msg) { 335 bounds = fopen(fname, "w"); 336 if (bounds == NULL) 337 err(errno, "%s", fname); 338 chmod(fname, CMODE); 339 fprintf(bounds, "%d %d\n", firstmsg, lastmsg); 340 fclose(bounds); 341 } 342 } 343 344 if (send_msg) { 345 /* 346 * Send mode - place msgs in _PATH_MSGS 347 */ 348 bounds = fopen(fname, "w"); 349 if (bounds == NULL) 350 err(errno, "%s", fname); 351 352 nextmsg = lastmsg + 1; 353 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg); 354 newmsg = fopen(fname, "w"); 355 if (newmsg == NULL) 356 err(errno, "%s", fname); 357 chmod(fname, CMODE); 358 359 fprintf(bounds, "%d %d\n", firstmsg, nextmsg); 360 fclose(bounds); 361 362 sending = YES; 363 if (ruptible) 364 signal(SIGINT, onintr); 365 366 if (isatty(fileno(stdin))) { 367 ptr = getpwuid(uid)->pw_name; 368 printf("Message %d:\nFrom %s %sSubject: ", 369 nextmsg, ptr, ctime(&t)); 370 fflush(stdout); 371 fgets(inbuf, sizeof inbuf, stdin); 372 putchar('\n'); 373 fflush(stdout); 374 fprintf(newmsg, "From %s %sSubject: %s\n", 375 ptr, ctime(&t), inbuf); 376 blankline = seensubj = YES; 377 } 378 else 379 blankline = seensubj = NO; 380 for (;;) { 381 fgets(inbuf, sizeof inbuf, stdin); 382 if (feof(stdin) || ferror(stdin)) 383 break; 384 blankline = (blankline || (inbuf[0] == '\n')); 385 seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0))); 386 fputs(inbuf, newmsg); 387 } 388 #ifdef OBJECT 389 if (!seensubj) { 390 printf("NOTICE: Messages should have a Subject field!\n"); 391 #ifdef REJECT 392 unlink(fname); 393 #endif 394 exit(1); 395 } 396 #endif 397 exit(ferror(stdin)); 398 } 399 if (clean) 400 exit(0); 401 402 /* 403 * prepare to display messages 404 */ 405 totty = (isatty(fileno(stdout)) != 0); 406 use_pager = use_pager && totty; 407 408 snprintf(fname, sizeof(fname), "%s/%s", getenv("HOME"), MSGSRC); 409 msgsrc = fopen(fname, "r"); 410 if (msgsrc) { 411 newrc = NO; 412 fscanf(msgsrc, "%d\n", &nextmsg); 413 fclose(msgsrc); 414 if (nextmsg > lastmsg+1) { 415 printf("Warning: bounds have been reset (%d, %d)\n", 416 firstmsg, lastmsg); 417 truncate(fname, (off_t)0); 418 newrc = YES; 419 } 420 else if (!rcfirst) 421 rcfirst = nextmsg - rcback; 422 } 423 else 424 newrc = YES; 425 msgsrc = fopen(fname, "r+"); 426 if (msgsrc == NULL) 427 msgsrc = fopen(fname, "w"); 428 if (msgsrc == NULL) 429 err(errno, "%s", fname); 430 if (rcfirst) { 431 if (rcfirst > lastmsg+1) { 432 printf("Warning: the last message is number %d.\n", 433 lastmsg); 434 rcfirst = nextmsg; 435 } 436 if (rcfirst > firstmsg) 437 firstmsg = rcfirst; /* don't set below first msg */ 438 } 439 if (newrc) { 440 nextmsg = firstmsg; 441 rewind(msgsrc); 442 fprintf(msgsrc, "%d\n", nextmsg); 443 fflush(msgsrc); 444 } 445 446 #ifdef V7 447 if (totty) { 448 struct winsize win; 449 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1) 450 Lpp = win.ws_row; 451 if (Lpp <= 0) { 452 if (tgetent(inbuf, getenv("TERM")) <= 0 453 || (Lpp = tgetnum(__DECONST(char *, "li"))) <= 0) { 454 Lpp = NLINES; 455 } 456 } 457 } 458 #endif 459 Lpp -= 6; /* for headers, etc. */ 460 461 already = NO; 462 prevmsg = firstmsg; 463 printing = YES; 464 if (ruptible) 465 signal(SIGINT, onintr); 466 467 /* 468 * Main program loop 469 */ 470 for (msg = firstmsg; msg <= lastmsg; msg++) { 471 472 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg); 473 newmsg = fopen(fname, "r"); 474 if (newmsg == NULL) 475 continue; 476 477 gfrsub(newmsg); /* get From and Subject fields */ 478 if (locomode && !local) { 479 fclose(newmsg); 480 continue; 481 } 482 483 if (qopt) { /* This has to be located here */ 484 printf("There are new messages.\n"); 485 exit(0); 486 } 487 488 if (already && !hdrs) 489 putchar('\n'); 490 491 /* 492 * Print header 493 */ 494 if (totty) 495 signal(SIGTSTP, onsusp); 496 (void) setjmp(tstpbuf); 497 already = YES; 498 nlines = 2; 499 if (seenfrom) { 500 printf("Message %d:\nFrom %s %s", msg, from, date); 501 nlines++; 502 } 503 if (seensubj) { 504 printf("Subject: %s", subj); 505 nlines++; 506 } 507 else { 508 if (seenfrom) { 509 putchar('\n'); 510 nlines++; 511 } 512 while (nlines < 6 513 && fgets(inbuf, sizeof inbuf, newmsg) 514 && inbuf[0] != '\n') { 515 fputs(inbuf, stdout); 516 nlines++; 517 } 518 } 519 520 lct = linecnt(newmsg); 521 if (lct) 522 printf("(%d%slines) ", lct, seensubj? " " : " more "); 523 524 if (hdrs) { 525 printf("\n-----\n"); 526 fclose(newmsg); 527 continue; 528 } 529 530 /* 531 * Ask user for command 532 */ 533 if (totty) 534 ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT)); 535 else 536 inbuf[0] = 'y'; 537 if (totty) 538 signal(SIGTSTP, SIG_DFL); 539 cmnd: 540 in = inbuf; 541 switch (*in) { 542 case 'x': 543 case 'X': 544 exit(0); 545 546 case 'q': 547 case 'Q': 548 quitit = YES; 549 printf("--Postponed--\n"); 550 exit(0); 551 /* intentional fall-thru */ 552 case 'n': 553 case 'N': 554 if (msg >= nextmsg) sep = "Flushed"; 555 prevmsg = msg; 556 break; 557 558 case 'p': 559 case 'P': 560 use_pager = (*in++ == 'p'); 561 /* intentional fallthru */ 562 case '\n': 563 case 'y': 564 default: 565 if (*in == '-') { 566 msg = prevmsg-1; 567 sep = "replay"; 568 break; 569 } 570 if (isdigit(*in)) { 571 msg = next(in); 572 sep = in; 573 break; 574 } 575 576 prmesg(nlines + lct + (seensubj? 1 : 0)); 577 prevmsg = msg; 578 579 } 580 581 printf("--%s--\n", sep); 582 sep = "-"; 583 if (msg >= nextmsg) { 584 nextmsg = msg + 1; 585 rewind(msgsrc); 586 fprintf(msgsrc, "%d\n", nextmsg); 587 fflush(msgsrc); 588 } 589 if (newmsg) 590 fclose(newmsg); 591 if (quitit) 592 break; 593 } 594 595 /* 596 * Make sure .rc file gets updated 597 */ 598 if (--msg >= nextmsg) { 599 nextmsg = msg + 1; 600 rewind(msgsrc); 601 fprintf(msgsrc, "%d\n", nextmsg); 602 fflush(msgsrc); 603 } 604 if (already && !quitit && lastcmd && totty) { 605 /* 606 * save or reply to last message? 607 */ 608 msg = prevmsg; 609 ask(NOMORE); 610 if (inbuf[0] == '-' || isdigit(inbuf[0])) 611 goto cmnd; 612 } 613 if (!(already || hush || qopt)) 614 printf("No new messages.\n"); 615 exit(0); 616 } 617 618 static void 619 usage() 620 { 621 fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n"); 622 exit(1); 623 } 624 625 void 626 prmesg(length) 627 int length; 628 { 629 FILE *outf; 630 char *env_pager; 631 632 if (use_pager && length > Lpp) { 633 signal(SIGPIPE, SIG_IGN); 634 signal(SIGQUIT, SIG_IGN); 635 if ((env_pager = getenv("PAGER")) == NULL) { 636 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp); 637 } else { 638 snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager); 639 } 640 outf = popen(cmdbuf, "w"); 641 if (!outf) 642 outf = stdout; 643 else 644 setbuf(outf, (char *)NULL); 645 } 646 else 647 outf = stdout; 648 649 if (seensubj) 650 putc('\n', outf); 651 652 while (fgets(inbuf, sizeof inbuf, newmsg)) { 653 fputs(inbuf, outf); 654 if (ferror(outf)) { 655 clearerr(outf); 656 break; 657 } 658 } 659 660 if (outf != stdout) { 661 pclose(outf); 662 signal(SIGPIPE, SIG_DFL); 663 signal(SIGQUIT, SIG_DFL); 664 } 665 else { 666 fflush(stdout); 667 } 668 669 /* force wait on output */ 670 tcdrain(fileno(stdout)); 671 } 672 673 void 674 onintr(unused) 675 int unused __unused; 676 { 677 signal(SIGINT, onintr); 678 if (mailing) 679 unlink(fname); 680 if (sending) { 681 unlink(fname); 682 puts("--Killed--"); 683 exit(1); 684 } 685 if (printing) { 686 putchar('\n'); 687 if (hdrs) 688 exit(0); 689 sep = "Interrupt"; 690 if (newmsg) 691 fseeko(newmsg, (off_t)0, SEEK_END); 692 intrpflg = YES; 693 } 694 } 695 696 /* 697 * We have just gotten a susp. Suspend and prepare to resume. 698 */ 699 void 700 onsusp(unused) 701 int unused __unused; 702 { 703 signal(SIGTSTP, SIG_DFL); 704 sigsetmask(0); 705 kill(0, SIGTSTP); 706 signal(SIGTSTP, onsusp); 707 if (!mailing) 708 longjmp(tstpbuf, 0); 709 } 710 711 int 712 linecnt(f) 713 FILE *f; 714 { 715 off_t oldpos = ftello(f); 716 int l = 0; 717 char lbuf[BUFSIZ]; 718 719 while (fgets(lbuf, sizeof lbuf, f)) 720 l++; 721 clearerr(f); 722 fseeko(f, oldpos, SEEK_SET); 723 return (l); 724 } 725 726 int 727 next(buf) 728 char *buf; 729 { 730 int i; 731 sscanf(buf, "%d", &i); 732 sprintf(buf, "Goto %d", i); 733 return(--i); 734 } 735 736 void 737 ask(prompt) 738 const char *prompt; 739 { 740 char inch; 741 int n, cmsg, fd; 742 off_t oldpos; 743 FILE *cpfrom, *cpto; 744 745 printf("%s ", prompt); 746 fflush(stdout); 747 intrpflg = NO; 748 (void) fgets(inbuf, sizeof inbuf, stdin); 749 if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n') 750 inbuf[n - 1] = '\0'; 751 if (intrpflg) 752 inbuf[0] = 'x'; 753 754 /* 755 * Handle 'mail' and 'save' here. 756 */ 757 if ((inch = inbuf[0]) == 's' || inch == 'm') { 758 if (inbuf[1] == '-') 759 cmsg = prevmsg; 760 else if (isdigit(inbuf[1])) 761 cmsg = atoi(&inbuf[1]); 762 else 763 cmsg = msg; 764 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg); 765 766 oldpos = ftello(newmsg); 767 768 cpfrom = fopen(fname, "r"); 769 if (!cpfrom) { 770 printf("Message %d not found\n", cmsg); 771 ask (prompt); 772 return; 773 } 774 775 if (inch == 's') { 776 in = nxtfld(inbuf); 777 if (*in) { 778 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */ 779 fname[n] = in[n]; 780 } 781 fname[n] = NULL; 782 } 783 else 784 strcpy(fname, "Messages"); 785 fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND); 786 } 787 else { 788 strcpy(fname, _PATH_TMP); 789 fd = mkstemp(fname); 790 if (fd != -1) { 791 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL, 792 fname); 793 mailing = YES; 794 } 795 } 796 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) { 797 if (fd != -1) 798 close(fd); 799 warn("%s", fname); 800 mailing = NO; 801 fseeko(newmsg, oldpos, SEEK_SET); 802 ask(prompt); 803 return; 804 } 805 806 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom))) 807 fwrite(inbuf, 1, n, cpto); 808 809 fclose(cpfrom); 810 fclose(cpto); 811 fseeko(newmsg, oldpos, SEEK_SET);/* reposition current message */ 812 if (inch == 's') 813 printf("Message %d saved in \"%s\"\n", cmsg, fname); 814 else { 815 system(cmdbuf); 816 unlink(fname); 817 mailing = NO; 818 } 819 ask(prompt); 820 } 821 } 822 823 void 824 gfrsub(infile) 825 FILE *infile; 826 { 827 off_t frompos; 828 int count; 829 830 seensubj = seenfrom = NO; 831 local = YES; 832 subj[0] = from[0] = date[0] = NULL; 833 834 /* 835 * Is this a normal message? 836 */ 837 if (fgets(inbuf, sizeof inbuf, infile)) { 838 if (strncmp(inbuf, "From", 4)==0) { 839 /* 840 * expected form starts with From 841 */ 842 seenfrom = YES; 843 frompos = ftello(infile); 844 ptr = from; 845 in = nxtfld(inbuf); 846 if (*in) { 847 count = sizeof(from) - 1; 848 while (*in && *in > ' ' && count-- > 0) { 849 if (*in == ':' || *in == '@' || 850 *in == '!') 851 local = NO; 852 *ptr++ = *in++; 853 } 854 } 855 *ptr = NULL; 856 if (*(in = nxtfld(in))) 857 strncpy(date, in, sizeof date); 858 else { 859 date[0] = '\n'; 860 date[1] = NULL; 861 } 862 } 863 else { 864 /* 865 * not the expected form 866 */ 867 rewind(infile); 868 return; 869 } 870 } 871 else 872 /* 873 * empty file ? 874 */ 875 return; 876 877 /* 878 * look for Subject line until EOF or a blank line 879 */ 880 while (fgets(inbuf, sizeof inbuf, infile) 881 && !(blankline = (inbuf[0] == '\n'))) { 882 /* 883 * extract Subject line 884 */ 885 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) { 886 seensubj = YES; 887 frompos = ftello(infile); 888 strncpy(subj, nxtfld(inbuf), sizeof subj); 889 } 890 } 891 if (!blankline) 892 /* 893 * ran into EOF 894 */ 895 fseeko(infile, frompos, SEEK_SET); 896 897 if (!seensubj) 898 /* 899 * for possible use with Mail 900 */ 901 strncpy(subj, "(No Subject)\n", sizeof subj); 902 } 903 904 char * 905 nxtfld(s) 906 unsigned char *s; 907 { 908 if (*s) while (*s && !isspace(*s)) s++; /* skip over this field */ 909 if (*s) while (*s && isspace(*s)) s++; /* find start of next field */ 910 return (s); 911 } 912