usr.bin/msgs/msgs.c

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