1 /* $NetBSD: msgs.c,v 1.22 2012/03/20 20:34:58 matt 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 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)msgs.c 8.2 (Berkeley) 4/28/95"; 41 #else 42 __RCSID("$NetBSD: msgs.c,v 1.22 2012/03/20 20:34:58 matt Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 /* 47 * msgs - a user bulletin board program 48 * 49 * usage: 50 * msgs [fhlopqr] [[-]number] to read messages 51 * msgs -s to place messages 52 * msgs -c [-days] to clean up the bulletin board 53 * 54 * prompt commands are: 55 * y print message 56 * n flush message, go to next message 57 * q flush message, quit 58 * p print message, turn on 'pipe thru more' mode 59 * P print message, turn off 'pipe thru more' mode 60 * - reprint last message 61 * s[-][<num>] [<filename>] save message 62 * m[-][<num>] mail with message in temp mbox 63 * x exit without flushing this message 64 * <num> print message number <num> 65 */ 66 67 #define V7 /* will look for TERM in the environment */ 68 #define OBJECT /* will object to messages without Subjects */ 69 #define REJECT /* will reject messages without Subjects 70 (OBJECT must be defined also) */ 71 /*#define UNBUFFERED */ /* use unbuffered output */ 72 73 #include <sys/param.h> 74 #include <sys/ioctl.h> 75 #include <sys/stat.h> 76 77 #include <ctype.h> 78 #include <dirent.h> 79 #include <err.h> 80 #include <errno.h> 81 #include <pwd.h> 82 #include <setjmp.h> 83 #include <signal.h> 84 #include <stdio.h> 85 #include <stdlib.h> 86 #include <string.h> 87 #include <termcap.h> 88 #include <termios.h> 89 #include <time.h> 90 #include <unistd.h> 91 92 #include "pathnames.h" 93 94 #define CMODE 0664 /* bounds file creation mode */ 95 #define NO 0 96 #define YES 1 97 #define SUPERUSER 0 /* superuser uid */ 98 #define DAEMON 1 /* daemon uid */ 99 #define NLINES 24 /* default number of lines/crt screen */ 100 #define NDAYS 21 /* default keep time for messages */ 101 #define DAYS *24*60*60 /* seconds/day */ 102 #define MSGSRC ".msgsrc" /* user's rc file */ 103 #define BOUNDS "bounds" /* message bounds file */ 104 #define NEXT "Next message? [yq]" 105 #define MORE "More? [ynq]" 106 #define NOMORE "(No more) [q] ?" 107 108 typedef char bool; 109 110 FILE *msgsrc; 111 FILE *newmsg; 112 const char *sep = "-"; 113 char inbuf[BUFSIZ]; 114 char fname[MAXPATHLEN]; 115 char cmdbuf[MAXPATHLEN + 16]; 116 char subj[128]; 117 char from[128]; 118 char date[128]; 119 char *ptr; 120 char *in; 121 bool local; 122 bool ruptible; 123 bool totty; 124 bool seenfrom; 125 bool seensubj; 126 bool blankline; 127 bool printing = NO; 128 bool mailing = NO; 129 bool quitit = NO; 130 bool sending = NO; 131 bool intrpflg = NO; 132 bool restricted = 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 void ask(const char *); 143 void gfrsub(FILE *); 144 int linecnt(FILE *); 145 int main(int, char *[]); 146 int next(char *); 147 char *nxtfld(char *); 148 void onintr(int); 149 void onsusp(int); 150 void prmesg(int); 151 152 /* option initialization */ 153 bool hdrs = NO; 154 bool qopt = NO; 155 bool hush = NO; 156 bool send_msg = NO; 157 bool locomode = NO; 158 bool use_pager = NO; 159 bool clean = NO; 160 bool lastcmd = NO; 161 jmp_buf tstpbuf; 162 163 int 164 main(int argc, char *argv[]) 165 { 166 bool newrc, already; 167 int rcfirst = 0; /* first message to print (from .rc) */ 168 int rcback = 0; /* amount to back off of rcfirst */ 169 int firstmsg, nextmsg, lastmsg = 0; 170 int blast = 0; 171 FILE *bounds; 172 struct passwd *pw; 173 174 #ifdef UNBUFFERED 175 setbuf(stdout, NULL); 176 #endif 177 178 time(&t); 179 setuid(uid = getuid()); 180 ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL); 181 if (ruptible) 182 signal(SIGINT, SIG_DFL); 183 184 argc--, argv++; 185 while (argc > 0) { 186 if (isdigit((unsigned char)argv[0][0])) {/* starting message # */ 187 rcfirst = atoi(argv[0]); 188 } 189 else if (isdigit((unsigned char)argv[0][1])) {/* backward offset */ 190 rcback = atoi( &( argv[0][1] ) ); 191 } 192 else { 193 ptr = *argv; 194 while (*ptr) switch (*ptr++) { 195 196 case '-': 197 break; 198 199 case 'c': 200 if (uid != SUPERUSER && uid != DAEMON) { 201 fprintf(stderr, "Sorry\n"); 202 exit(1); 203 } 204 clean = YES; 205 break; 206 207 case 'f': /* silently */ 208 hush = YES; 209 break; 210 211 case 'h': /* headers only */ 212 hdrs = YES; 213 break; 214 215 case 'l': /* local msgs only */ 216 locomode = YES; 217 break; 218 219 case 'o': /* option to save last message */ 220 lastcmd = YES; 221 break; 222 223 case 'p': /* pipe thru 'more' during long msgs */ 224 use_pager = YES; 225 break; 226 227 case 'q': /* query only */ 228 qopt = YES; 229 break; 230 231 case 'r': /* restricted */ 232 restricted = YES; 233 break; 234 235 236 case 's': /* sending TO msgs */ 237 send_msg = YES; 238 break; 239 240 default: 241 fprintf(stderr, 242 "usage: msgs [cfhlopqrs] [[-]number]\n"); 243 exit(1); 244 } 245 } 246 argc--, argv++; 247 } 248 249 /* 250 * determine current message bounds 251 */ 252 snprintf(fname, sizeof (fname), "%s/%s", _PATH_MSGS, BOUNDS); 253 bounds = fopen(fname, "r"); 254 255 if (bounds != NULL) { 256 if (fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg) < 2) 257 firstmsg = lastmsg = 0; 258 fclose(bounds); 259 blast = lastmsg; /* save upper bound */ 260 } 261 262 if (clean) 263 keep = t - (rcback? rcback : NDAYS) DAYS; 264 265 if (clean || bounds == NULL) { /* relocate message bounds */ 266 struct dirent *dp; 267 struct stat stbuf; 268 bool seenany = NO; 269 DIR *dirp; 270 271 dirp = opendir(_PATH_MSGS); 272 if (dirp == NULL) { 273 perror(_PATH_MSGS); 274 exit(errno); 275 } 276 chmod(fname, CMODE); 277 278 firstmsg = 32767; 279 lastmsg = 0; 280 281 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){ 282 char *cp = dp->d_name; 283 int i = 0; 284 285 if (dp->d_ino == 0) 286 continue; 287 #ifndef __SVR4 288 if (dp->d_namlen == 0) 289 continue; 290 #endif 291 292 if (clean) 293 snprintf(inbuf, sizeof (inbuf), "%s/%s", 294 _PATH_MSGS, cp); 295 296 while (isdigit((unsigned char)*cp)) 297 i = i * 10 + *cp++ - '0'; 298 if (*cp) 299 continue; /* not a message! */ 300 301 if (clean) { 302 if (stat(inbuf, &stbuf) != 0) 303 continue; 304 if (stbuf.st_mtime < keep 305 && stbuf.st_mode&S_IWRITE) { 306 unlink(inbuf); 307 continue; 308 } 309 } 310 311 if (i > lastmsg) 312 lastmsg = i; 313 if (i < firstmsg) 314 firstmsg = i; 315 seenany = YES; 316 } 317 closedir(dirp); 318 319 if (!seenany) { 320 if (blast != 0) /* never lower the upper bound! */ 321 lastmsg = blast; 322 firstmsg = lastmsg + 1; 323 } 324 else if (blast > lastmsg) 325 lastmsg = blast; 326 327 if (!send_msg) { 328 bounds = fopen(fname, "w"); 329 if (bounds == NULL) { 330 perror(fname); 331 exit(errno); 332 } 333 chmod(fname, CMODE); 334 fprintf(bounds, "%d %d\n", firstmsg, lastmsg); 335 fclose(bounds); 336 } 337 } 338 339 if (send_msg) { 340 /* 341 * Send mode - place msgs in _PATH_MSGS 342 */ 343 bounds = fopen(fname, "w"); 344 if (bounds == NULL) { 345 perror(fname); 346 exit(errno); 347 } 348 349 nextmsg = lastmsg + 1; 350 snprintf(fname, sizeof (fname), "%s/%d", _PATH_MSGS, nextmsg); 351 newmsg = fopen(fname, "w"); 352 if (newmsg == NULL) { 353 perror(fname); 354 exit(errno); 355 } 356 chmod(fname, 0644); 357 358 fprintf(bounds, "%d %d\n", firstmsg, nextmsg); 359 fclose(bounds); 360 361 sending = YES; 362 if (ruptible) 363 signal(SIGINT, onintr); 364 365 if (isatty(fileno(stdin))) { 366 pw = getpwuid(uid); 367 if (!pw) { 368 fprintf(stderr, "Who are you?\n"); 369 exit(1); 370 } 371 printf("Message %d:\nFrom %s %sSubject: ", 372 nextmsg, pw->pw_name, ctime(&t)); 373 fflush(stdout); 374 fgets(inbuf, sizeof inbuf, stdin); 375 putchar('\n'); 376 fflush(stdout); 377 fprintf(newmsg, "From %s %sSubject: %s\n", 378 ptr, ctime(&t), inbuf); 379 blankline = seensubj = YES; 380 } 381 else 382 blankline = seensubj = NO; 383 for (;;) { 384 fgets(inbuf, sizeof inbuf, stdin); 385 if (feof(stdin) || ferror(stdin)) 386 break; 387 blankline = (blankline || (inbuf[0] == '\n')); 388 seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0))); 389 fputs(inbuf, newmsg); 390 } 391 #ifdef OBJECT 392 if (!seensubj) { 393 printf("NOTICE: Messages should have a Subject field!\n"); 394 #ifdef REJECT 395 unlink(fname); 396 #endif 397 exit(1); 398 } 399 #endif 400 exit(ferror(stdin)); 401 } 402 if (clean) 403 exit(0); 404 405 /* 406 * prepare to display messages 407 */ 408 totty = (isatty(fileno(stdout)) != 0); 409 use_pager = use_pager && totty; 410 411 { 412 char *home = getenv("HOME"); 413 if(home == NULL || *home == '\0') 414 errx(1, "$HOME not set"); 415 snprintf(fname, sizeof (fname), "%s/%s", home, MSGSRC); 416 } 417 msgsrc = fopen(fname, "r"); 418 if (msgsrc) { 419 newrc = NO; 420 fscanf(msgsrc, "%d\n", &nextmsg); 421 fclose(msgsrc); 422 if (nextmsg > lastmsg+1) { 423 printf("Warning: bounds have been reset (%d, %d)\n", 424 firstmsg, lastmsg); 425 truncate(fname, (off_t)0); 426 newrc = YES; 427 } 428 else if (!rcfirst) 429 rcfirst = nextmsg - rcback; 430 } 431 else 432 newrc = YES; 433 msgsrc = fopen(fname, "r+"); 434 if (msgsrc == NULL) 435 msgsrc = fopen(fname, "w"); 436 if (msgsrc == NULL) { 437 perror(fname); 438 exit(errno); 439 } 440 if (rcfirst) { 441 if (rcfirst > lastmsg+1) { 442 printf("Warning: the last message is number %d.\n", 443 lastmsg); 444 rcfirst = nextmsg; 445 } 446 if (rcfirst > firstmsg) 447 firstmsg = rcfirst; /* don't set below first msg */ 448 } 449 if (newrc) { 450 nextmsg = firstmsg; 451 fseek(msgsrc, 0L, 0); 452 fprintf(msgsrc, "%d\n", nextmsg); 453 fflush(msgsrc); 454 } 455 456 #ifdef V7 457 if (totty) { 458 struct winsize win; 459 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1) 460 Lpp = win.ws_row; 461 if (Lpp <= 0) { 462 if (tgetent(inbuf, getenv("TERM")) <= 0 463 || (Lpp = tgetnum("li")) <= 0) { 464 Lpp = NLINES; 465 } 466 } 467 } 468 #endif 469 Lpp -= 6; /* for headers, etc. */ 470 471 already = NO; 472 prevmsg = firstmsg; 473 printing = YES; 474 if (ruptible) 475 signal(SIGINT, onintr); 476 477 /* 478 * Main program loop 479 */ 480 for (msg = firstmsg; msg <= lastmsg; msg++) { 481 482 snprintf(fname, sizeof (fname), "%s/%d", _PATH_MSGS, msg); 483 newmsg = fopen(fname, "r"); 484 if (newmsg == NULL) 485 continue; 486 487 gfrsub(newmsg); /* get From and Subject fields */ 488 if (locomode && !local) { 489 fclose(newmsg); 490 continue; 491 } 492 493 if (qopt) { /* This has to be located here */ 494 printf("There are new messages.\n"); 495 exit(0); 496 } 497 498 if (already && !hdrs) 499 putchar('\n'); 500 501 /* 502 * Print header 503 */ 504 if (totty) 505 signal(SIGTSTP, onsusp); 506 (void) setjmp(tstpbuf); 507 already = YES; 508 nlines = 2; 509 if (seenfrom) { 510 printf("Message %d:\nFrom %s %s", msg, from, date); 511 nlines++; 512 } 513 if (seensubj) { 514 printf("Subject: %s", subj); 515 nlines++; 516 } 517 else { 518 if (seenfrom) { 519 putchar('\n'); 520 nlines++; 521 } 522 while (nlines < 6 523 && fgets(inbuf, sizeof inbuf, newmsg) 524 && inbuf[0] != '\n') { 525 fputs(inbuf, stdout); 526 nlines++; 527 } 528 } 529 530 lct = linecnt(newmsg); 531 if (lct) 532 printf("(%d%slines) ", lct, seensubj? " " : " more "); 533 534 if (hdrs) { 535 printf("\n-----\n"); 536 fclose(newmsg); 537 continue; 538 } 539 540 /* 541 * Ask user for command 542 */ 543 if (totty) 544 ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT)); 545 else 546 inbuf[0] = 'y'; 547 if (totty) 548 signal(SIGTSTP, SIG_DFL); 549 cmnd: 550 in = inbuf; 551 switch (*in) { 552 case 'x': 553 case 'X': 554 exit(0); 555 556 case 'q': 557 case 'Q': 558 quitit = YES; 559 printf("--Postponed--\n"); 560 exit(0); 561 /* intentional fall-thru */ 562 case 'n': 563 case 'N': 564 if (msg >= nextmsg) sep = "Flushed"; 565 prevmsg = msg; 566 break; 567 568 case 'p': 569 case 'P': 570 use_pager = (*in++ == 'p'); 571 /* intentional fallthru */ 572 case '\n': 573 case 'y': 574 default: 575 if (*in == '-') { 576 msg = prevmsg-1; 577 sep = "replay"; 578 break; 579 } 580 if (isdigit((unsigned char)*in)) { 581 msg = next(in); 582 sep = in; 583 break; 584 } 585 586 prmesg(nlines + lct + (seensubj? 1 : 0)); 587 prevmsg = msg; 588 589 } 590 591 printf("--%s--\n", sep); 592 sep = "-"; 593 if (msg >= nextmsg) { 594 nextmsg = msg + 1; 595 fseek(msgsrc, 0L, 0); 596 fprintf(msgsrc, "%d\n", nextmsg); 597 fflush(msgsrc); 598 } 599 if (newmsg) 600 fclose(newmsg); 601 if (quitit) 602 break; 603 } 604 605 /* 606 * Make sure .rc file gets updated 607 */ 608 if (--msg >= nextmsg) { 609 nextmsg = msg + 1; 610 fseek(msgsrc, 0L, 0); 611 fprintf(msgsrc, "%d\n", nextmsg); 612 fflush(msgsrc); 613 } 614 if (already && !quitit && lastcmd && totty) { 615 /* 616 * save or reply to last message? 617 */ 618 msg = prevmsg; 619 ask(NOMORE); 620 if (inbuf[0] == '-' || isdigit((unsigned char)inbuf[0])) 621 goto cmnd; 622 } 623 if (!(already || hush || qopt)) 624 printf("No new messages.\n"); 625 exit(0); 626 } 627 628 void 629 prmesg(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 env_pager[0] == '\0') { 639 snprintf(cmdbuf, sizeof(cmdbuf), "%s -z%d", 640 _PATH_PAGER, Lpp); 641 } else { 642 strlcpy(cmdbuf, env_pager, sizeof (cmdbuf)); 643 } 644 outf = popen(cmdbuf, "w"); 645 if (!outf) 646 outf = stdout; 647 else 648 setbuf(outf, NULL); 649 } 650 else 651 outf = stdout; 652 653 if (seensubj) 654 putc('\n', outf); 655 656 while (fgets(inbuf, sizeof inbuf, newmsg)) { 657 fputs(inbuf, outf); 658 if (ferror(outf)) { 659 clearerr(outf); 660 break; 661 } 662 } 663 664 if (outf != stdout) { 665 pclose(outf); 666 signal(SIGPIPE, SIG_DFL); 667 signal(SIGQUIT, SIG_DFL); 668 } 669 else { 670 fflush(stdout); 671 } 672 673 /* trick to force wait on output */ 674 tcdrain(fileno(stdout)); 675 } 676 677 void 678 onintr(int dummy) 679 { 680 signal(SIGINT, onintr); 681 if (mailing) 682 unlink(fname); 683 if (sending) { 684 unlink(fname); 685 puts("--Killed--"); 686 exit(1); 687 } 688 if (printing) { 689 putchar('\n'); 690 if (hdrs) 691 exit(0); 692 sep = "Interrupt"; 693 if (newmsg) 694 fseek(newmsg, 0L, 2); 695 intrpflg = YES; 696 } 697 } 698 699 /* 700 * We have just gotten a susp. Suspend and prepare to resume. 701 */ 702 void 703 onsusp(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(FILE *f) 716 { 717 off_t oldpos = ftell(f); 718 int l = 0; 719 char lbuf[BUFSIZ]; 720 721 while (fgets(lbuf, sizeof lbuf, f)) 722 l++; 723 clearerr(f); 724 fseek(f, oldpos, 0); 725 return (l); 726 } 727 728 int 729 next(char *buf) 730 { 731 int i; 732 sscanf(buf, "%d", &i); 733 snprintf(buf, sizeof (buf), "Goto %d", i); 734 return(--i); 735 } 736 737 void 738 ask(const char *prompt) 739 { 740 char inch; 741 int n, cmsg; 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') && !restricted) { 758 if (inbuf[1] == '-') 759 cmsg = prevmsg; 760 else if (isdigit((unsigned char)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 = ftell(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] = '\0'; 782 } 783 else 784 strlcpy(fname, "Messages", sizeof(fname)); 785 } 786 else { 787 int fd; 788 789 strlcpy(fname, _PATH_TMP, sizeof(fname)); 790 fd = mkstemp(fname); 791 if (fd == -1) 792 err(1, "mkstemp failed"); 793 close(fd); 794 snprintf(cmdbuf, sizeof (cmdbuf), _PATH_MAIL, fname); 795 mailing = YES; 796 } 797 cpto = fopen(fname, "a"); 798 if (!cpto) { 799 perror(fname); 800 mailing = NO; 801 fseek(newmsg, oldpos, 0); 802 ask(prompt); 803 return; 804 } 805 806 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)) != 0) 807 fwrite(inbuf, 1, n, cpto); 808 809 fclose(cpfrom); 810 fclose(cpto); 811 fseek(newmsg, oldpos, 0); /* 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(FILE *infile) 825 { 826 off_t frompos; 827 828 seensubj = seenfrom = NO; 829 local = YES; 830 subj[0] = from[0] = date[0] = 0; 831 832 /* 833 * Is this a normal message? 834 */ 835 if (fgets(inbuf, sizeof inbuf, infile)) { 836 if (strncmp(inbuf, "From", 4)==0) { 837 /* 838 * expected form starts with From 839 */ 840 seenfrom = YES; 841 frompos = ftell(infile); 842 ptr = from; 843 in = nxtfld(inbuf); 844 if (*in) while (*in && *in > ' ') { 845 if (*in == ':' || *in == '@' || *in == '!') 846 local = NO; 847 *ptr++ = *in++; 848 /* what about sizeof from ? */ 849 } 850 *ptr = '\0'; 851 if (*(in = nxtfld(in))) 852 strncpy(date, in, sizeof date); 853 else { 854 date[0] = '\n'; 855 date[1] = '\0'; 856 } 857 } 858 else { 859 /* 860 * not the expected form 861 */ 862 fseek(infile, 0L, 0); 863 return; 864 } 865 } 866 else 867 /* 868 * empty file ? 869 */ 870 return; 871 872 /* 873 * look for Subject line until EOF or a blank line 874 */ 875 while (fgets(inbuf, sizeof inbuf, infile) 876 && !(blankline = (inbuf[0] == '\n'))) { 877 /* 878 * extract Subject line 879 */ 880 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) { 881 seensubj = YES; 882 frompos = ftell(infile); 883 strncpy(subj, nxtfld(inbuf), sizeof subj); 884 } 885 } 886 if (!blankline) 887 /* 888 * ran into EOF 889 */ 890 fseek(infile, frompos, 0); 891 892 if (!seensubj) 893 /* 894 * for possible use with Mail 895 */ 896 strncpy(subj, "(No Subject)\n", sizeof subj); 897 } 898 899 char * 900 nxtfld(char *s) 901 { 902 if (*s) while (*s && *s > ' ') s++; /* skip over this field */ 903 if (*s) while (*s && *s <= ' ') s++; /* find start of next field */ 904 return (s); 905 } 906