msgs.c revision 1.14
1 /* $NetBSD: msgs.c,v 1.14 1999/04/20 07:24:49 mrg 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 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)msgs.c 8.2 (Berkeley) 4/28/95"; 45 #else 46 __RCSID("$NetBSD: msgs.c,v 1.14 1999/04/20 07:24:49 mrg Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * msgs - a user bulletin board program 52 * 53 * usage: 54 * msgs [fhlopqr] [[-]number] to read messages 55 * msgs -s to place messages 56 * msgs -c [-days] to clean up the bulletin board 57 * 58 * prompt commands are: 59 * y print message 60 * n flush message, go to next message 61 * q flush message, quit 62 * p print message, turn on 'pipe thru more' mode 63 * P print message, turn off 'pipe thru more' mode 64 * - reprint last message 65 * s[-][<num>] [<filename>] save message 66 * m[-][<num>] mail with message in temp mbox 67 * x exit without flushing this message 68 * <num> print message number <num> 69 */ 70 71 #define V7 /* will look for TERM in the environment */ 72 #define OBJECT /* will object to messages without Subjects */ 73 #define REJECT /* will reject messages without Subjects 74 (OBJECT must be defined also) */ 75 /*#define UNBUFFERED */ /* use unbuffered output */ 76 77 #include <sys/param.h> 78 #include <sys/ioctl.h> 79 #include <sys/stat.h> 80 81 #include <ctype.h> 82 #include <dirent.h> 83 #include <err.h> 84 #include <errno.h> 85 #include <pwd.h> 86 #include <setjmp.h> 87 #include <signal.h> 88 #include <stdio.h> 89 #include <stdlib.h> 90 #include <string.h> 91 #include <termcap.h> 92 #include <termios.h> 93 #include <time.h> 94 #include <unistd.h> 95 96 #include "pathnames.h" 97 98 #define CMODE 0664 /* bounds file creation mode */ 99 #define NO 0 100 #define YES 1 101 #define SUPERUSER 0 /* superuser uid */ 102 #define DAEMON 1 /* daemon uid */ 103 #define NLINES 24 /* default number of lines/crt screen */ 104 #define NDAYS 21 /* default keep time for messages */ 105 #define DAYS *24*60*60 /* seconds/day */ 106 #define MSGSRC ".msgsrc" /* user's rc file */ 107 #define BOUNDS "bounds" /* message bounds file */ 108 #define NEXT "Next message? [yq]" 109 #define MORE "More? [ynq]" 110 #define NOMORE "(No more) [q] ?" 111 112 typedef char bool; 113 114 FILE *msgsrc; 115 FILE *newmsg; 116 char *sep = "-"; 117 char inbuf[BUFSIZ]; 118 char fname[128]; 119 char cmdbuf[128]; 120 char subj[128]; 121 char from[128]; 122 char date[128]; 123 char *ptr; 124 char *in; 125 bool local; 126 bool ruptible; 127 bool totty; 128 bool seenfrom; 129 bool seensubj; 130 bool blankline; 131 bool printing = NO; 132 bool mailing = NO; 133 bool quitit = NO; 134 bool sending = NO; 135 bool intrpflg = NO; 136 bool restricted = NO; 137 int uid; 138 int msg; 139 int prevmsg; 140 int lct; 141 int nlines; 142 int Lpp = 0; 143 time_t t; 144 time_t keep; 145 146 void ask __P((char *)); 147 void gfrsub __P((FILE *)); 148 int linecnt __P((FILE *)); 149 int main __P((int, char *[])); 150 int next __P((char *)); 151 char *nxtfld __P((char *)); 152 void onintr __P((int)); 153 void onsusp __P((int)); 154 void prmesg __P((int)); 155 156 /* option initialization */ 157 bool hdrs = NO; 158 bool qopt = NO; 159 bool hush = NO; 160 bool send_msg = NO; 161 bool locomode = NO; 162 bool use_pager = NO; 163 bool clean = NO; 164 bool lastcmd = NO; 165 jmp_buf tstpbuf; 166 167 int 168 main(argc, argv) 169 int argc; char *argv[]; 170 { 171 bool newrc, already; 172 int rcfirst = 0; /* first message to print (from .rc) */ 173 int rcback = 0; /* amount to back off of rcfirst */ 174 int firstmsg, nextmsg, lastmsg = 0; 175 int blast = 0; 176 FILE *bounds; 177 struct passwd *pw; 178 179 #ifdef UNBUFFERED 180 setbuf(stdout, NULL); 181 #endif 182 183 time(&t); 184 setuid(uid = getuid()); 185 ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL); 186 if (ruptible) 187 signal(SIGINT, SIG_DFL); 188 189 argc--, argv++; 190 while (argc > 0) { 191 if (isdigit((unsigned char)argv[0][0])) {/* starting message # */ 192 rcfirst = atoi(argv[0]); 193 } 194 else if (isdigit((unsigned char)argv[0][1])) {/* backward offset */ 195 rcback = atoi( &( argv[0][1] ) ); 196 } 197 else { 198 ptr = *argv; 199 while (*ptr) switch (*ptr++) { 200 201 case '-': 202 break; 203 204 case 'c': 205 if (uid != SUPERUSER && uid != DAEMON) { 206 fprintf(stderr, "Sorry\n"); 207 exit(1); 208 } 209 clean = YES; 210 break; 211 212 case 'f': /* silently */ 213 hush = YES; 214 break; 215 216 case 'h': /* headers only */ 217 hdrs = YES; 218 break; 219 220 case 'l': /* local msgs only */ 221 locomode = YES; 222 break; 223 224 case 'o': /* option to save last message */ 225 lastcmd = YES; 226 break; 227 228 case 'p': /* pipe thru 'more' during long msgs */ 229 use_pager = YES; 230 break; 231 232 case 'q': /* query only */ 233 qopt = YES; 234 break; 235 236 case 'r': /* restricted */ 237 restricted = YES; 238 break; 239 240 241 case 's': /* sending TO msgs */ 242 send_msg = YES; 243 break; 244 245 default: 246 fprintf(stderr, 247 "usage: msgs [fhlopqr] [[-]number]\n"); 248 exit(1); 249 } 250 } 251 argc--, argv++; 252 } 253 254 /* 255 * determine current message bounds 256 */ 257 sprintf(fname, "%s/%s", _PATH_MSGS, BOUNDS); 258 bounds = fopen(fname, "r"); 259 260 if (bounds != NULL) { 261 if (fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg) < 2) 262 firstmsg = lastmsg = 0; 263 fclose(bounds); 264 blast = lastmsg; /* save upper bound */ 265 } 266 267 if (clean) 268 keep = t - (rcback? rcback : NDAYS) DAYS; 269 270 if (clean || bounds == NULL) { /* relocate message bounds */ 271 struct dirent *dp; 272 struct stat stbuf; 273 bool seenany = NO; 274 DIR *dirp; 275 276 dirp = opendir(_PATH_MSGS); 277 if (dirp == NULL) { 278 perror(_PATH_MSGS); 279 exit(errno); 280 } 281 chmod(fname, CMODE); 282 283 firstmsg = 32767; 284 lastmsg = 0; 285 286 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){ 287 char *cp = dp->d_name; 288 int i = 0; 289 290 if (dp->d_ino == 0) 291 continue; 292 #ifndef __SVR4 293 if (dp->d_namlen == 0) 294 continue; 295 #endif 296 297 if (clean) 298 sprintf(inbuf, "%s/%s", _PATH_MSGS, cp); 299 300 while (isdigit((unsigned char)*cp)) 301 i = i * 10 + *cp++ - '0'; 302 if (*cp) 303 continue; /* not a message! */ 304 305 if (clean) { 306 if (stat(inbuf, &stbuf) != 0) 307 continue; 308 if (stbuf.st_mtime < keep 309 && stbuf.st_mode&S_IWRITE) { 310 unlink(inbuf); 311 continue; 312 } 313 } 314 315 if (i > lastmsg) 316 lastmsg = i; 317 if (i < firstmsg) 318 firstmsg = i; 319 seenany = YES; 320 } 321 closedir(dirp); 322 323 if (!seenany) { 324 if (blast != 0) /* never lower the upper bound! */ 325 lastmsg = blast; 326 firstmsg = lastmsg + 1; 327 } 328 else if (blast > lastmsg) 329 lastmsg = blast; 330 331 if (!send_msg) { 332 bounds = fopen(fname, "w"); 333 if (bounds == NULL) { 334 perror(fname); 335 exit(errno); 336 } 337 chmod(fname, CMODE); 338 fprintf(bounds, "%d %d\n", firstmsg, lastmsg); 339 fclose(bounds); 340 } 341 } 342 343 if (send_msg) { 344 /* 345 * Send mode - place msgs in _PATH_MSGS 346 */ 347 bounds = fopen(fname, "w"); 348 if (bounds == NULL) { 349 perror(fname); 350 exit(errno); 351 } 352 353 nextmsg = lastmsg + 1; 354 sprintf(fname, "%s/%d", _PATH_MSGS, nextmsg); 355 newmsg = fopen(fname, "w"); 356 if (newmsg == NULL) { 357 perror(fname); 358 exit(errno); 359 } 360 chmod(fname, 0644); 361 362 fprintf(bounds, "%d %d\n", firstmsg, nextmsg); 363 fclose(bounds); 364 365 sending = YES; 366 if (ruptible) 367 signal(SIGINT, onintr); 368 369 if (isatty(fileno(stdin))) { 370 pw = getpwuid(uid); 371 if (!pw) { 372 fprintf(stderr, "Who are you?\n"); 373 exit(1); 374 } 375 printf("Message %d:\nFrom %s %sSubject: ", 376 nextmsg, pw->pw_name, ctime(&t)); 377 fflush(stdout); 378 fgets(inbuf, sizeof inbuf, stdin); 379 putchar('\n'); 380 fflush(stdout); 381 fprintf(newmsg, "From %s %sSubject: %s\n", 382 ptr, ctime(&t), inbuf); 383 blankline = seensubj = YES; 384 } 385 else 386 blankline = seensubj = NO; 387 for (;;) { 388 fgets(inbuf, sizeof inbuf, stdin); 389 if (feof(stdin) || ferror(stdin)) 390 break; 391 blankline = (blankline || (inbuf[0] == '\n')); 392 seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0))); 393 fputs(inbuf, newmsg); 394 } 395 #ifdef OBJECT 396 if (!seensubj) { 397 printf("NOTICE: Messages should have a Subject field!\n"); 398 #ifdef REJECT 399 unlink(fname); 400 #endif 401 exit(1); 402 } 403 #endif 404 exit(ferror(stdin)); 405 } 406 if (clean) 407 exit(0); 408 409 /* 410 * prepare to display messages 411 */ 412 totty = (isatty(fileno(stdout)) != 0); 413 use_pager = use_pager && totty; 414 415 sprintf(fname, "%s/%s", getenv("HOME"), MSGSRC); 416 msgsrc = fopen(fname, "r"); 417 if (msgsrc) { 418 newrc = NO; 419 fscanf(msgsrc, "%d\n", &nextmsg); 420 fclose(msgsrc); 421 if (nextmsg > lastmsg+1) { 422 printf("Warning: bounds have been reset (%d, %d)\n", 423 firstmsg, lastmsg); 424 truncate(fname, (off_t)0); 425 newrc = YES; 426 } 427 else if (!rcfirst) 428 rcfirst = nextmsg - rcback; 429 } 430 else 431 newrc = YES; 432 msgsrc = fopen(fname, "r+"); 433 if (msgsrc == NULL) 434 msgsrc = fopen(fname, "w"); 435 if (msgsrc == NULL) { 436 perror(fname); 437 exit(errno); 438 } 439 if (rcfirst) { 440 if (rcfirst > lastmsg+1) { 441 printf("Warning: the last message is number %d.\n", 442 lastmsg); 443 rcfirst = nextmsg; 444 } 445 if (rcfirst > firstmsg) 446 firstmsg = rcfirst; /* don't set below first msg */ 447 } 448 if (newrc) { 449 nextmsg = firstmsg; 450 fseek(msgsrc, 0L, 0); 451 fprintf(msgsrc, "%d\n", nextmsg); 452 fflush(msgsrc); 453 } 454 455 #ifdef V7 456 if (totty) { 457 struct winsize win; 458 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1) 459 Lpp = win.ws_row; 460 if (Lpp <= 0) { 461 if (tgetent(inbuf, getenv("TERM")) <= 0 462 || (Lpp = tgetnum("li")) <= 0) { 463 Lpp = NLINES; 464 } 465 } 466 } 467 #endif 468 Lpp -= 6; /* for headers, etc. */ 469 470 already = NO; 471 prevmsg = firstmsg; 472 printing = YES; 473 if (ruptible) 474 signal(SIGINT, onintr); 475 476 /* 477 * Main program loop 478 */ 479 for (msg = firstmsg; msg <= lastmsg; msg++) { 480 481 sprintf(fname, "%s/%d", _PATH_MSGS, msg); 482 newmsg = fopen(fname, "r"); 483 if (newmsg == NULL) 484 continue; 485 486 gfrsub(newmsg); /* get From and Subject fields */ 487 if (locomode && !local) { 488 fclose(newmsg); 489 continue; 490 } 491 492 if (qopt) { /* This has to be located here */ 493 printf("There are new messages.\n"); 494 exit(0); 495 } 496 497 if (already && !hdrs) 498 putchar('\n'); 499 500 /* 501 * Print header 502 */ 503 if (totty) 504 signal(SIGTSTP, onsusp); 505 (void) setjmp(tstpbuf); 506 already = YES; 507 nlines = 2; 508 if (seenfrom) { 509 printf("Message %d:\nFrom %s %s", msg, from, date); 510 nlines++; 511 } 512 if (seensubj) { 513 printf("Subject: %s", subj); 514 nlines++; 515 } 516 else { 517 if (seenfrom) { 518 putchar('\n'); 519 nlines++; 520 } 521 while (nlines < 6 522 && fgets(inbuf, sizeof inbuf, newmsg) 523 && inbuf[0] != '\n') { 524 fputs(inbuf, stdout); 525 nlines++; 526 } 527 } 528 529 lct = linecnt(newmsg); 530 if (lct) 531 printf("(%d%slines) ", lct, seensubj? " " : " more "); 532 533 if (hdrs) { 534 printf("\n-----\n"); 535 fclose(newmsg); 536 continue; 537 } 538 539 /* 540 * Ask user for command 541 */ 542 if (totty) 543 ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT)); 544 else 545 inbuf[0] = 'y'; 546 if (totty) 547 signal(SIGTSTP, SIG_DFL); 548 cmnd: 549 in = inbuf; 550 switch (*in) { 551 case 'x': 552 case 'X': 553 exit(0); 554 555 case 'q': 556 case 'Q': 557 quitit = YES; 558 printf("--Postponed--\n"); 559 exit(0); 560 /* intentional fall-thru */ 561 case 'n': 562 case 'N': 563 if (msg >= nextmsg) sep = "Flushed"; 564 prevmsg = msg; 565 break; 566 567 case 'p': 568 case 'P': 569 use_pager = (*in++ == 'p'); 570 /* intentional fallthru */ 571 case '\n': 572 case 'y': 573 default: 574 if (*in == '-') { 575 msg = prevmsg-1; 576 sep = "replay"; 577 break; 578 } 579 if (isdigit((unsigned char)*in)) { 580 msg = next(in); 581 sep = in; 582 break; 583 } 584 585 prmesg(nlines + lct + (seensubj? 1 : 0)); 586 prevmsg = msg; 587 588 } 589 590 printf("--%s--\n", sep); 591 sep = "-"; 592 if (msg >= nextmsg) { 593 nextmsg = msg + 1; 594 fseek(msgsrc, 0L, 0); 595 fprintf(msgsrc, "%d\n", nextmsg); 596 fflush(msgsrc); 597 } 598 if (newmsg) 599 fclose(newmsg); 600 if (quitit) 601 break; 602 } 603 604 /* 605 * Make sure .rc file gets updated 606 */ 607 if (--msg >= nextmsg) { 608 nextmsg = msg + 1; 609 fseek(msgsrc, 0L, 0); 610 fprintf(msgsrc, "%d\n", nextmsg); 611 fflush(msgsrc); 612 } 613 if (already && !quitit && lastcmd && totty) { 614 /* 615 * save or reply to last message? 616 */ 617 msg = prevmsg; 618 ask(NOMORE); 619 if (inbuf[0] == '-' || isdigit((unsigned char)inbuf[0])) 620 goto cmnd; 621 } 622 if (!(already || hush || qopt)) 623 printf("No new messages.\n"); 624 exit(0); 625 } 626 627 void 628 prmesg(length) 629 int length; 630 { 631 FILE *outf; 632 char *env_pager; 633 634 if (use_pager && length > Lpp) { 635 signal(SIGPIPE, SIG_IGN); 636 signal(SIGQUIT, SIG_IGN); 637 if ((env_pager = getenv("PAGER")) == NULL) { 638 sprintf(cmdbuf, _PATH_PAGER, Lpp); 639 } else { 640 strcpy(cmdbuf, env_pager); 641 } 642 outf = popen(cmdbuf, "w"); 643 if (!outf) 644 outf = stdout; 645 else 646 setbuf(outf, (char *)NULL); 647 } 648 else 649 outf = stdout; 650 651 if (seensubj) 652 putc('\n', outf); 653 654 while (fgets(inbuf, sizeof inbuf, newmsg)) { 655 fputs(inbuf, outf); 656 if (ferror(outf)) { 657 clearerr(outf); 658 break; 659 } 660 } 661 662 if (outf != stdout) { 663 pclose(outf); 664 signal(SIGPIPE, SIG_DFL); 665 signal(SIGQUIT, SIG_DFL); 666 } 667 else { 668 fflush(stdout); 669 } 670 671 /* trick to force wait on output */ 672 tcdrain(fileno(stdout)); 673 } 674 675 void 676 onintr(dummy) 677 int dummy; 678 { 679 signal(SIGINT, onintr); 680 if (mailing) 681 unlink(fname); 682 if (sending) { 683 unlink(fname); 684 puts("--Killed--"); 685 exit(1); 686 } 687 if (printing) { 688 putchar('\n'); 689 if (hdrs) 690 exit(0); 691 sep = "Interrupt"; 692 if (newmsg) 693 fseek(newmsg, 0L, 2); 694 intrpflg = YES; 695 } 696 } 697 698 /* 699 * We have just gotten a susp. Suspend and prepare to resume. 700 */ 701 void 702 onsusp(dummy) 703 int dummy; 704 { 705 706 signal(SIGTSTP, SIG_DFL); 707 sigsetmask(0); 708 kill(0, SIGTSTP); 709 signal(SIGTSTP, onsusp); 710 if (!mailing) 711 longjmp(tstpbuf, 0); 712 } 713 714 int 715 linecnt(f) 716 FILE *f; 717 { 718 off_t oldpos = ftell(f); 719 int l = 0; 720 char lbuf[BUFSIZ]; 721 722 while (fgets(lbuf, sizeof lbuf, f)) 723 l++; 724 clearerr(f); 725 fseek(f, oldpos, 0); 726 return (l); 727 } 728 729 int 730 next(buf) 731 char *buf; 732 { 733 int i; 734 sscanf(buf, "%d", &i); 735 sprintf(buf, "Goto %d", i); 736 return(--i); 737 } 738 739 void 740 ask(prompt) 741 char *prompt; 742 { 743 char inch; 744 int n, cmsg; 745 off_t oldpos; 746 FILE *cpfrom, *cpto; 747 748 printf("%s ", prompt); 749 fflush(stdout); 750 intrpflg = NO; 751 (void) fgets(inbuf, sizeof inbuf, stdin); 752 if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n') 753 inbuf[n - 1] = '\0'; 754 if (intrpflg) 755 inbuf[0] = 'x'; 756 757 /* 758 * Handle 'mail' and 'save' here. 759 */ 760 if (((inch = inbuf[0]) == 's' || inch == 'm') && !restricted) { 761 if (inbuf[1] == '-') 762 cmsg = prevmsg; 763 else if (isdigit((unsigned char)inbuf[1])) 764 cmsg = atoi(&inbuf[1]); 765 else 766 cmsg = msg; 767 sprintf(fname, "%s/%d", _PATH_MSGS, cmsg); 768 769 oldpos = ftell(newmsg); 770 771 cpfrom = fopen(fname, "r"); 772 if (!cpfrom) { 773 printf("Message %d not found\n", cmsg); 774 ask (prompt); 775 return; 776 } 777 778 if (inch == 's') { 779 in = nxtfld(inbuf); 780 if (*in) { 781 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */ 782 fname[n] = in[n]; 783 } 784 fname[n] = '\0'; 785 } 786 else 787 strcpy(fname, "Messages"); 788 } 789 else { 790 int fd; 791 792 strcpy(fname, _PATH_TMP); 793 fd = mkstemp(fname); 794 if (fd == -1) 795 err(1, "mkstemp failed"); 796 close(fd); 797 sprintf(cmdbuf, _PATH_MAIL, fname); 798 mailing = YES; 799 } 800 cpto = fopen(fname, "a"); 801 if (!cpto) { 802 perror(fname); 803 mailing = NO; 804 fseek(newmsg, oldpos, 0); 805 ask(prompt); 806 return; 807 } 808 809 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)) != 0) 810 fwrite(inbuf, 1, n, cpto); 811 812 fclose(cpfrom); 813 fclose(cpto); 814 fseek(newmsg, oldpos, 0); /* reposition current message */ 815 if (inch == 's') 816 printf("Message %d saved in \"%s\"\n", cmsg, fname); 817 else { 818 system(cmdbuf); 819 unlink(fname); 820 mailing = NO; 821 } 822 ask(prompt); 823 } 824 } 825 826 void 827 gfrsub(infile) 828 FILE *infile; 829 { 830 off_t frompos; 831 832 seensubj = seenfrom = NO; 833 local = YES; 834 subj[0] = from[0] = date[0] = 0; 835 836 /* 837 * Is this a normal message? 838 */ 839 if (fgets(inbuf, sizeof inbuf, infile)) { 840 if (strncmp(inbuf, "From", 4)==0) { 841 /* 842 * expected form starts with From 843 */ 844 seenfrom = YES; 845 frompos = ftell(infile); 846 ptr = from; 847 in = nxtfld(inbuf); 848 if (*in) while (*in && *in > ' ') { 849 if (*in == ':' || *in == '@' || *in == '!') 850 local = NO; 851 *ptr++ = *in++; 852 /* what about sizeof from ? */ 853 } 854 *ptr = '\0'; 855 if (*(in = nxtfld(in))) 856 strncpy(date, in, sizeof date); 857 else { 858 date[0] = '\n'; 859 date[1] = '\0'; 860 } 861 } 862 else { 863 /* 864 * not the expected form 865 */ 866 fseek(infile, 0L, 0); 867 return; 868 } 869 } 870 else 871 /* 872 * empty file ? 873 */ 874 return; 875 876 /* 877 * look for Subject line until EOF or a blank line 878 */ 879 while (fgets(inbuf, sizeof inbuf, infile) 880 && !(blankline = (inbuf[0] == '\n'))) { 881 /* 882 * extract Subject line 883 */ 884 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) { 885 seensubj = YES; 886 frompos = ftell(infile); 887 strncpy(subj, nxtfld(inbuf), sizeof subj); 888 } 889 } 890 if (!blankline) 891 /* 892 * ran into EOF 893 */ 894 fseek(infile, frompos, 0); 895 896 if (!seensubj) 897 /* 898 * for possible use with Mail 899 */ 900 strncpy(subj, "(No Subject)\n", sizeof subj); 901 } 902 903 char * 904 nxtfld(s) 905 char *s; 906 { 907 if (*s) while (*s && *s > ' ') s++; /* skip over this field */ 908 if (*s) while (*s && *s <= ' ') s++; /* find start of next field */ 909 return (s); 910 } 911
Indexes created Wed Sep 24 05:09:52 GMT 2025