msgs.c revision 1.16
1 /* $NetBSD: msgs.c,v 1.16 2000/07/06 14:21:47 ad 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 1.16 2000/07/06 14:21:47 ad 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[MAXPATHLEN]; 119 char cmdbuf[MAXPATHLEN + 16]; 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 snprintf(fname, sizeof (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 snprintf(inbuf, sizeof (inbuf), "%s/%s", 299 _PATH_MSGS, cp); 300 301 while (isdigit((unsigned char)*cp)) 302 i = i * 10 + *cp++ - '0'; 303 if (*cp) 304 continue; /* not a message! */ 305 306 if (clean) { 307 if (stat(inbuf, &stbuf) != 0) 308 continue; 309 if (stbuf.st_mtime < keep 310 && stbuf.st_mode&S_IWRITE) { 311 unlink(inbuf); 312 continue; 313 } 314 } 315 316 if (i > lastmsg) 317 lastmsg = i; 318 if (i < firstmsg) 319 firstmsg = i; 320 seenany = YES; 321 } 322 closedir(dirp); 323 324 if (!seenany) { 325 if (blast != 0) /* never lower the upper bound! */ 326 lastmsg = blast; 327 firstmsg = lastmsg + 1; 328 } 329 else if (blast > lastmsg) 330 lastmsg = blast; 331 332 if (!send_msg) { 333 bounds = fopen(fname, "w"); 334 if (bounds == NULL) { 335 perror(fname); 336 exit(errno); 337 } 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 perror(fname); 351 exit(errno); 352 } 353 354 nextmsg = lastmsg + 1; 355 snprintf(fname, sizeof (fname), "%s/%d", _PATH_MSGS, nextmsg); 356 newmsg = fopen(fname, "w"); 357 if (newmsg == NULL) { 358 perror(fname); 359 exit(errno); 360 } 361 chmod(fname, 0644); 362 363 fprintf(bounds, "%d %d\n", firstmsg, nextmsg); 364 fclose(bounds); 365 366 sending = YES; 367 if (ruptible) 368 signal(SIGINT, onintr); 369 370 if (isatty(fileno(stdin))) { 371 pw = getpwuid(uid); 372 if (!pw) { 373 fprintf(stderr, "Who are you?\n"); 374 exit(1); 375 } 376 printf("Message %d:\nFrom %s %sSubject: ", 377 nextmsg, pw->pw_name, ctime(&t)); 378 fflush(stdout); 379 fgets(inbuf, sizeof inbuf, stdin); 380 putchar('\n'); 381 fflush(stdout); 382 fprintf(newmsg, "From %s %sSubject: %s\n", 383 ptr, ctime(&t), inbuf); 384 blankline = seensubj = YES; 385 } 386 else 387 blankline = seensubj = NO; 388 for (;;) { 389 fgets(inbuf, sizeof inbuf, stdin); 390 if (feof(stdin) || ferror(stdin)) 391 break; 392 blankline = (blankline || (inbuf[0] == '\n')); 393 seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0))); 394 fputs(inbuf, newmsg); 395 } 396 #ifdef OBJECT 397 if (!seensubj) { 398 printf("NOTICE: Messages should have a Subject field!\n"); 399 #ifdef REJECT 400 unlink(fname); 401 #endif 402 exit(1); 403 } 404 #endif 405 exit(ferror(stdin)); 406 } 407 if (clean) 408 exit(0); 409 410 /* 411 * prepare to display messages 412 */ 413 totty = (isatty(fileno(stdout)) != 0); 414 use_pager = use_pager && totty; 415 416 snprintf(fname, sizeof (fname), "%s/%s", getenv("HOME"), MSGSRC); 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(length) 630 int length; 631 { 632 FILE *outf; 633 char *env_pager; 634 635 if (use_pager && length > Lpp) { 636 signal(SIGPIPE, SIG_IGN); 637 signal(SIGQUIT, SIG_IGN); 638 if ((env_pager = getenv("PAGER")) == NULL || 639 env_pager[0] == '\0') { 640 snprintf(cmdbuf, sizeof(cmdbuf), "%s -z%d", 641 _PATH_PAGER, Lpp); 642 } else { 643 strlcpy(cmdbuf, env_pager, sizeof (cmdbuf)); 644 } 645 outf = popen(cmdbuf, "w"); 646 if (!outf) 647 outf = stdout; 648 else 649 setbuf(outf, (char *)NULL); 650 } 651 else 652 outf = stdout; 653 654 if (seensubj) 655 putc('\n', outf); 656 657 while (fgets(inbuf, sizeof inbuf, newmsg)) { 658 fputs(inbuf, outf); 659 if (ferror(outf)) { 660 clearerr(outf); 661 break; 662 } 663 } 664 665 if (outf != stdout) { 666 pclose(outf); 667 signal(SIGPIPE, SIG_DFL); 668 signal(SIGQUIT, SIG_DFL); 669 } 670 else { 671 fflush(stdout); 672 } 673 674 /* trick to force wait on output */ 675 tcdrain(fileno(stdout)); 676 } 677 678 void 679 onintr(dummy) 680 int dummy; 681 { 682 signal(SIGINT, onintr); 683 if (mailing) 684 unlink(fname); 685 if (sending) { 686 unlink(fname); 687 puts("--Killed--"); 688 exit(1); 689 } 690 if (printing) { 691 putchar('\n'); 692 if (hdrs) 693 exit(0); 694 sep = "Interrupt"; 695 if (newmsg) 696 fseek(newmsg, 0L, 2); 697 intrpflg = YES; 698 } 699 } 700 701 /* 702 * We have just gotten a susp. Suspend and prepare to resume. 703 */ 704 void 705 onsusp(dummy) 706 int dummy; 707 { 708 709 signal(SIGTSTP, SIG_DFL); 710 sigsetmask(0); 711 kill(0, SIGTSTP); 712 signal(SIGTSTP, onsusp); 713 if (!mailing) 714 longjmp(tstpbuf, 0); 715 } 716 717 int 718 linecnt(f) 719 FILE *f; 720 { 721 off_t oldpos = ftell(f); 722 int l = 0; 723 char lbuf[BUFSIZ]; 724 725 while (fgets(lbuf, sizeof lbuf, f)) 726 l++; 727 clearerr(f); 728 fseek(f, oldpos, 0); 729 return (l); 730 } 731 732 int 733 next(buf) 734 char *buf; 735 { 736 int i; 737 sscanf(buf, "%d", &i); 738 snprintf(buf, sizeof (buf), "Goto %d", i); 739 return(--i); 740 } 741 742 void 743 ask(prompt) 744 char *prompt; 745 { 746 char inch; 747 int n, cmsg; 748 off_t oldpos; 749 FILE *cpfrom, *cpto; 750 751 printf("%s ", prompt); 752 fflush(stdout); 753 intrpflg = NO; 754 (void) fgets(inbuf, sizeof inbuf, stdin); 755 if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n') 756 inbuf[n - 1] = '\0'; 757 if (intrpflg) 758 inbuf[0] = 'x'; 759 760 /* 761 * Handle 'mail' and 'save' here. 762 */ 763 if (((inch = inbuf[0]) == 's' || inch == 'm') && !restricted) { 764 if (inbuf[1] == '-') 765 cmsg = prevmsg; 766 else if (isdigit((unsigned char)inbuf[1])) 767 cmsg = atoi(&inbuf[1]); 768 else 769 cmsg = msg; 770 snprintf(fname, sizeof (fname), "%s/%d", _PATH_MSGS, cmsg); 771 772 oldpos = ftell(newmsg); 773 774 cpfrom = fopen(fname, "r"); 775 if (!cpfrom) { 776 printf("Message %d not found\n", cmsg); 777 ask (prompt); 778 return; 779 } 780 781 if (inch == 's') { 782 in = nxtfld(inbuf); 783 if (*in) { 784 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */ 785 fname[n] = in[n]; 786 } 787 fname[n] = '\0'; 788 } 789 else 790 strlcpy(fname, "Messages", sizeof(fname)); 791 } 792 else { 793 int fd; 794 795 strlcpy(fname, _PATH_TMP, sizeof(fname)); 796 fd = mkstemp(fname); 797 if (fd == -1) 798 err(1, "mkstemp failed"); 799 close(fd); 800 snprintf(cmdbuf, sizeof (cmdbuf), _PATH_MAIL, fname); 801 mailing = YES; 802 } 803 cpto = fopen(fname, "a"); 804 if (!cpto) { 805 perror(fname); 806 mailing = NO; 807 fseek(newmsg, oldpos, 0); 808 ask(prompt); 809 return; 810 } 811 812 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)) != 0) 813 fwrite(inbuf, 1, n, cpto); 814 815 fclose(cpfrom); 816 fclose(cpto); 817 fseek(newmsg, oldpos, 0); /* reposition current message */ 818 if (inch == 's') 819 printf("Message %d saved in \"%s\"\n", cmsg, fname); 820 else { 821 system(cmdbuf); 822 unlink(fname); 823 mailing = NO; 824 } 825 ask(prompt); 826 } 827 } 828 829 void 830 gfrsub(infile) 831 FILE *infile; 832 { 833 off_t frompos; 834 835 seensubj = seenfrom = NO; 836 local = YES; 837 subj[0] = from[0] = date[0] = 0; 838 839 /* 840 * Is this a normal message? 841 */ 842 if (fgets(inbuf, sizeof inbuf, infile)) { 843 if (strncmp(inbuf, "From", 4)==0) { 844 /* 845 * expected form starts with From 846 */ 847 seenfrom = YES; 848 frompos = ftell(infile); 849 ptr = from; 850 in = nxtfld(inbuf); 851 if (*in) while (*in && *in > ' ') { 852 if (*in == ':' || *in == '@' || *in == '!') 853 local = NO; 854 *ptr++ = *in++; 855 /* what about sizeof from ? */ 856 } 857 *ptr = '\0'; 858 if (*(in = nxtfld(in))) 859 strncpy(date, in, sizeof date); 860 else { 861 date[0] = '\n'; 862 date[1] = '\0'; 863 } 864 } 865 else { 866 /* 867 * not the expected form 868 */ 869 fseek(infile, 0L, 0); 870 return; 871 } 872 } 873 else 874 /* 875 * empty file ? 876 */ 877 return; 878 879 /* 880 * look for Subject line until EOF or a blank line 881 */ 882 while (fgets(inbuf, sizeof inbuf, infile) 883 && !(blankline = (inbuf[0] == '\n'))) { 884 /* 885 * extract Subject line 886 */ 887 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) { 888 seensubj = YES; 889 frompos = ftell(infile); 890 strncpy(subj, nxtfld(inbuf), sizeof subj); 891 } 892 } 893 if (!blankline) 894 /* 895 * ran into EOF 896 */ 897 fseek(infile, frompos, 0); 898 899 if (!seensubj) 900 /* 901 * for possible use with Mail 902 */ 903 strncpy(subj, "(No Subject)\n", sizeof subj); 904 } 905 906 char * 907 nxtfld(s) 908 char *s; 909 { 910 if (*s) while (*s && *s > ' ') s++; /* skip over this field */ 911 if (*s) while (*s && *s <= ' ') s++; /* find start of next field */ 912 return (s); 913 } 914
Indexes created Fri Sep 26 08:10:20 GMT 2025