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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1980, 1993\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif /* not lint */
  35
  36 #if 0
  37 #ifndef lint
  38 static char sccsid[] = "@(#)msgs.c      8.2 (Berkeley) 4/28/95";
  39 #endif /* not lint */
  40 #endif
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 /*
  46  * msgs - a user bulletin board program
  47  *
  48  * usage:
  49  *      msgs [fhlopq] [[-]number]       to read messages
  50  *      msgs -s                         to place messages
  51  *      msgs -c [-days]                 to clean up the bulletin board
  52  *
  53  * prompt commands are:
  54  *      y       print message
  55  *      n       flush message, go to next message
  56  *      q       flush message, quit
  57  *      p       print message, turn on 'pipe thru more' mode
  58  *      P       print message, turn off 'pipe thru more' mode
  59  *      -       reprint last message
  60  *      s[-][<num>] [<filename>]        save message
  61  *      m[-][<num>]     mail with message in temp mbox
  62  *      x       exit without flushing this message
  63  *      <num>   print message number <num>
  64  */
  65
  66 #define V7              /* will look for TERM in the environment */
  67 #define OBJECT          /* will object to messages without Subjects */
  68 /* #define REJECT */    /* will reject messages without Subjects
  69                            (OBJECT must be defined also) */
  70 /* #define UNBUFFERED *//* use unbuffered output */
  71
  72 #include <sys/param.h>
  73 #include <sys/stat.h>
  74 #include <ctype.h>
  75 #include <dirent.h>
  76 #include <err.h>
  77 #include <errno.h>
  78 #include <fcntl.h>
  79 #include <locale.h>
  80 #include <pwd.h>
  81 #include <setjmp.h>
  82 #include <termcap.h>
  83 #include <termios.h>
  84 #include <signal.h>
  85 #include <stdio.h>
  86 #include <stdlib.h>
  87 #include <string.h>
  88 #include <time.h>
  89 #include <unistd.h>
  90 #include "pathnames.h"
  91
  92 #define CMODE   0644            /* bounds file creation mode */
  93 #define NO      0
  94 #define YES     1
  95 #define SUPERUSER       0       /* superuser uid */
  96 #define DAEMON          1       /* daemon uid */
  97 #define NLINES  24              /* default number of lines/crt screen */
  98 #define NDAYS   21              /* default keep time for messages */
  99 #define DAYS    *24*60*60       /* seconds/day */
 100 #define MSGSRC  ".msgsrc"       /* user's rc file */
 101 #define BOUNDS  "bounds"        /* message bounds file */
 102 #define NEXT    "Next message? [yq]"
 103 #define MORE    "More? [ynq]"
 104 #define NOMORE  "(No more) [q] ?"
 105
 106 typedef char    bool;
 107
 108 FILE    *msgsrc;
 109 FILE    *newmsg;
 110 const char *sep = "-";
 111 char    inbuf[BUFSIZ];
 112 char    fname[MAXPATHLEN];
 113 char    cmdbuf[MAXPATHLEN + MAXPATHLEN];
 114 char    subj[128];
 115 char    from[128];
 116 char    date[128];
 117 char    *ptr;
 118 char    *in;
 119 bool    local;
 120 bool    ruptible;
 121 bool    totty;
 122 bool    seenfrom;
 123 bool    seensubj;
 124 bool    blankline;
 125 bool    printing = NO;
 126 bool    mailing = NO;
 127 bool    quitit = NO;
 128 bool    sending = NO;
 129 bool    intrpflg = NO;
 130 uid_t   uid;
 131 int     msg;
 132 int     prevmsg;
 133 int     lct;
 134 int     nlines;
 135 int     Lpp = 0;
 136 time_t  t;
 137 time_t  keep;
 138
 139 /* option initialization */
 140 bool    hdrs = NO;
 141 bool    qopt = NO;
 142 bool    hush = NO;
 143 bool    send_msg = NO;
 144 bool    locomode = NO;
 145 bool    use_pager = NO;
 146 bool    clean = NO;
 147 bool    lastcmd = NO;
 148 jmp_buf tstpbuf;
 149
 150 static void     ask(const char *);
 151 static void     gfrsub(FILE *);
 152 static int      linecnt(FILE *);
 153 static int      next(char *);
 154 static char     *nxtfld(char *);
 155 static void     onsusp(int);
 156 static void     onintr(int);
 157 static void     prmesg(int);
 158 static void usage(void);
 159
 160 int
 161 main(int argc, char *argv[])
 162 {
 163         bool newrc, already;
 164         int rcfirst = 0;                /* first message to print (from .rc) */
 165         int rcback = 0;                 /* amount to back off of rcfirst */
 166         int firstmsg = 0, nextmsg = 0, lastmsg = 0;
 167         int blast = 0;
 168         struct stat buf;                /* stat to check access of bounds */
 169         FILE *bounds;
 170         char *cp;
 171
 172 #ifdef UNBUFFERED
 173         setbuf(stdout, NULL);
 174 #endif
 175         setlocale(LC_ALL, "");
 176
 177         time(&t);
 178         setuid(uid = getuid());
 179         ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
 180         if (ruptible)
 181                 signal(SIGINT, SIG_DFL);
 182
 183         argc--, argv++;
 184         while (argc > 0) {
 185                 if (isdigit(argv[0][0])) {      /* starting message # */
 186                         rcfirst = atoi(argv[0]);
 187                 }
 188                 else if (isdigit(argv[0][1])) { /* backward offset */
 189                         rcback = atoi( &( argv[0][1] ) );
 190                 }
 191                 else {
 192                         ptr = *argv;
 193                         while (*ptr) switch (*ptr++) {
 194
 195                         case '-':
 196                                 break;
 197
 198                         case 'c':
 199                                 if (uid != SUPERUSER && uid != DAEMON)
 200                                         errx(1,
 201                                 "only the super-user can use the c flag");
 202                                 clean = YES;
 203                                 break;
 204
 205                         case 'f':               /* silently */
 206                                 hush = YES;
 207                                 break;
 208
 209                         case 'h':               /* headers only */
 210                                 hdrs = YES;
 211                                 break;
 212
 213                         case 'l':               /* local msgs only */
 214                                 locomode = YES;
 215                                 break;
 216
 217                         case 'o':               /* option to save last message */
 218                                 lastcmd = YES;
 219                                 break;
 220
 221                         case 'p':               /* pipe thru 'more' during long msgs */
 222                                 use_pager = YES;
 223                                 break;
 224
 225                         case 'q':               /* query only */
 226                                 qopt = YES;
 227                                 break;
 228
 229                         case 's':               /* sending TO msgs */
 230                                 send_msg = YES;
 231                                 break;
 232
 233                         default:
 234                                 usage();
 235                         }
 236                 }
 237                 argc--, argv++;
 238         }
 239
 240         /*
 241          * determine current message bounds
 242          */
 243         snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS);
 244
 245         /*
 246          * Test access rights to the bounds file
 247          * This can be a little tricky.  if(send_msg), then
 248          * we will create it.  We assume that if(send_msg),
 249          * then you have write permission there.
 250          * Else, it better be there, or we bail.
 251          */
 252         if (send_msg != YES) {
 253                 if (stat(fname, &buf) < 0) {
 254                         if (hush != YES) {
 255                                 err(errno, "%s", fname);
 256                         } else {
 257                                 exit(1);
 258                         }
 259                 }
 260         }
 261         bounds = fopen(fname, "r");
 262
 263         if (bounds != NULL) {
 264                 fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg);
 265                 fclose(bounds);
 266                 blast = lastmsg;        /* save upper bound */
 267         }
 268
 269         if (clean)
 270                 keep = t - (rcback? rcback : NDAYS) DAYS;
 271
 272         if (clean || bounds == NULL) {  /* relocate message bounds */
 273                 struct dirent *dp;
 274                 struct stat stbuf;
 275                 bool seenany = NO;
 276                 DIR     *dirp;
 277
 278                 dirp = opendir(_PATH_MSGS);
 279                 if (dirp == NULL)
 280                         err(errno, "%s", _PATH_MSGS);
 281
 282                 firstmsg = 32767;
 283                 lastmsg = 0;
 284
 285                 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
 286                         cp = dp->d_name;
 287                         int i = 0;
 288
 289                         if (dp->d_ino == 0)
 290                                 continue;
 291                         if (dp->d_namlen == 0)
 292                                 continue;
 293
 294                         if (clean)
 295                                 snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp);
 296
 297                         while (isdigit(*cp))
 298                                 i = i * 10 + *cp++ - '0';
 299                         if (*cp)
 300                                 continue;       /* not a message! */
 301
 302                         if (clean) {
 303                                 if (stat(inbuf, &stbuf) != 0)
 304                                         continue;
 305                                 if (stbuf.st_mtime < keep
 306                                     && stbuf.st_mode&S_IWRITE) {
 307                                         unlink(inbuf);
 308                                         continue;
 309                                 }
 310                         }
 311
 312                         if (i > lastmsg)
 313                                 lastmsg = i;
 314                         if (i < firstmsg)
 315                                 firstmsg = i;
 316                         seenany = YES;
 317                 }
 318                 closedir(dirp);
 319
 320                 if (!seenany) {
 321                         if (blast != 0) /* never lower the upper bound! */
 322                                 lastmsg = blast;
 323                         firstmsg = lastmsg + 1;
 324                 }
 325                 else if (blast > lastmsg)
 326                         lastmsg = blast;
 327
 328                 if (!send_msg) {
 329                         bounds = fopen(fname, "w");
 330                         if (bounds == NULL)
 331                                 err(errno, "%s", fname);
 332                         chmod(fname, CMODE);
 333                         fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
 334                         fclose(bounds);
 335                 }
 336         }
 337
 338         if (send_msg) {
 339                 /*
 340                  * Send mode - place msgs in _PATH_MSGS
 341                  */
 342                 bounds = fopen(fname, "w");
 343                 if (bounds == NULL)
 344                         err(errno, "%s", fname);
 345
 346                 nextmsg = lastmsg + 1;
 347                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg);
 348                 newmsg = fopen(fname, "w");
 349                 if (newmsg == NULL)
 350                         err(errno, "%s", fname);
 351                 chmod(fname, CMODE);
 352
 353                 fprintf(bounds, "%d %d\n", firstmsg, nextmsg);
 354                 fclose(bounds);
 355
 356                 sending = YES;
 357                 if (ruptible)
 358                         signal(SIGINT, onintr);
 359
 360                 if (isatty(fileno(stdin))) {
 361                         ptr = getpwuid(uid)->pw_name;
 362                         printf("Message %d:\nFrom %s %sSubject: ",
 363                                 nextmsg, ptr, ctime(&t));
 364                         fflush(stdout);
 365                         fgets(inbuf, sizeof inbuf, stdin);
 366                         putchar('\n');
 367                         fflush(stdout);
 368                         fprintf(newmsg, "From %s %sSubject: %s\n",
 369                                 ptr, ctime(&t), inbuf);
 370                         blankline = seensubj = YES;
 371                 }
 372                 else
 373                         blankline = seensubj = NO;
 374                 for (;;) {
 375                         fgets(inbuf, sizeof inbuf, stdin);
 376                         if (feof(stdin) || ferror(stdin))
 377                                 break;
 378                         blankline = (blankline || (inbuf[0] == '\n'));
 379                         seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
 380                         fputs(inbuf, newmsg);
 381                 }
 382 #ifdef OBJECT
 383                 if (!seensubj) {
 384                         printf("NOTICE: Messages should have a Subject field!\n");
 385 #ifdef REJECT
 386                         unlink(fname);
 387 #endif
 388                         exit(1);
 389                 }
 390 #endif
 391                 exit(ferror(stdin));
 392         }
 393         if (clean)
 394                 exit(0);
 395
 396         /*
 397          * prepare to display messages
 398          */
 399         totty = (isatty(fileno(stdout)) != 0);
 400         use_pager = use_pager && totty;
 401
 402         if ((cp = getenv("HOME")) == NULL || *cp == '\0') {
 403                 fprintf(stderr, "Error, no home directory!\n");
 404                 exit(1);
 405         }
 406         snprintf(fname, sizeof(fname), "%s/%s", cp, MSGSRC);
 407         msgsrc = fopen(fname, "r");
 408         if (msgsrc) {
 409                 newrc = NO;
 410                 fscanf(msgsrc, "%d\n", &nextmsg);
 411                 fclose(msgsrc);
 412                 if (nextmsg > lastmsg+1) {
 413                         printf("Warning: bounds have been reset (%d, %d)\n",
 414                                 firstmsg, lastmsg);
 415                         truncate(fname, (off_t)0);
 416                         newrc = YES;
 417                 }
 418                 else if (!rcfirst)
 419                         rcfirst = nextmsg - rcback;
 420         }
 421         else
 422                 newrc = YES;
 423         msgsrc = fopen(fname, "r+");
 424         if (msgsrc == NULL)
 425                 msgsrc = fopen(fname, "w");
 426         if (msgsrc == NULL)
 427                 err(errno, "%s", fname);
 428         if (rcfirst) {
 429                 if (rcfirst > lastmsg+1) {
 430                         printf("Warning: the last message is number %d.\n",
 431                                 lastmsg);
 432                         rcfirst = nextmsg;
 433                 }
 434                 if (rcfirst > firstmsg)
 435                         firstmsg = rcfirst;     /* don't set below first msg */
 436         }
 437         if (newrc) {
 438                 nextmsg = firstmsg;
 439                 rewind(msgsrc);
 440                 fprintf(msgsrc, "%d\n", nextmsg);
 441                 fflush(msgsrc);
 442         }
 443
 444 #ifdef V7
 445         if (totty) {
 446                 struct winsize win;
 447                 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
 448                         Lpp = win.ws_row;
 449                 if (Lpp <= 0) {
 450                         if (tgetent(inbuf, getenv("TERM")) <= 0
 451                             || (Lpp = tgetnum("li")) <= 0) {
 452                                 Lpp = NLINES;
 453                         }
 454                 }
 455         }
 456 #endif
 457         Lpp -= 6;       /* for headers, etc. */
 458
 459         already = NO;
 460         prevmsg = firstmsg;
 461         printing = YES;
 462         if (ruptible)
 463                 signal(SIGINT, onintr);
 464
 465         /*
 466          * Main program loop
 467          */
 468         for (msg = firstmsg; msg <= lastmsg; msg++) {
 469
 470                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
 471                 newmsg = fopen(fname, "r");
 472                 if (newmsg == NULL)
 473                         continue;
 474
 475                 gfrsub(newmsg);         /* get From and Subject fields */
 476                 if (locomode && !local) {
 477                         fclose(newmsg);
 478                         continue;
 479                 }
 480
 481                 if (qopt) {     /* This has to be located here */
 482                         printf("There are new messages.\n");
 483                         exit(0);
 484                 }
 485
 486                 if (already && !hdrs)
 487                         putchar('\n');
 488
 489                 /*
 490                  * Print header
 491                  */
 492                 if (totty)
 493                         signal(SIGTSTP, onsusp);
 494                 (void) setjmp(tstpbuf);
 495                 already = YES;
 496                 nlines = 2;
 497                 if (seenfrom) {
 498                         printf("Message %d:\nFrom %s %s", msg, from, date);
 499                         nlines++;
 500                 }
 501                 if (seensubj) {
 502                         printf("Subject: %s", subj);
 503                         nlines++;
 504                 }
 505                 else {
 506                         if (seenfrom) {
 507                                 putchar('\n');
 508                                 nlines++;
 509                         }
 510                         while (nlines < 6
 511                             && fgets(inbuf, sizeof inbuf, newmsg)
 512                             && inbuf[0] != '\n') {
 513                                 fputs(inbuf, stdout);
 514                                 nlines++;
 515                         }
 516                 }
 517
 518                 lct = linecnt(newmsg);
 519                 if (lct)
 520                         printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
 521                             (lct == 1) ? "" : "s");
 522
 523                 if (hdrs) {
 524                         printf("\n-----\n");
 525                         fclose(newmsg);
 526                         continue;
 527                 }
 528
 529                 /*
 530                  * Ask user for command
 531                  */
 532                 if (totty)
 533                         ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
 534                 else
 535                         inbuf[0] = 'y';
 536                 if (totty)
 537                         signal(SIGTSTP, SIG_DFL);
 538 cmnd:
 539                 in = inbuf;
 540                 switch (*in) {
 541                         case 'x':
 542                                 /* FALLTHROUGH */
 543                         case 'X':
 544                                 exit(0);
 545                                 /* NOTREACHED */
 546
 547                         case 'q':
 548                                 /* FALLTHROUGH */
 549                         case 'Q':
 550                                 quitit = YES;
 551                                 printf("--Postponed--\n");
 552                                 exit(0);
 553                                 /* NOTREACHED */
 554
 555                         case 'n':
 556                                 /* FALLTHROUGH */
 557                         case 'N':
 558                                 if (msg >= nextmsg) sep = "Flushed";
 559                                 prevmsg = msg;
 560                                 break;
 561
 562                         case 'p':
 563                                 /* FALLTHROUGH */
 564                         case 'P':
 565                                 use_pager = (*in++ == 'p');
 566                                 /* FALLTHROUGH */
 567                         case '\n':
 568                                 /* FALLTHROUGH */
 569                         case 'y':
 570                         default:
 571                                 if (*in == '-') {
 572                                         msg = prevmsg-1;
 573                                         sep = "replay";
 574                                         break;
 575                                 }
 576                                 if (isdigit(*in)) {
 577                                         msg = next(in);
 578                                         sep = in;
 579                                         break;
 580                                 }
 581
 582                                 prmesg(nlines + lct + (seensubj? 1 : 0));
 583                                 prevmsg = msg;
 584
 585                 }
 586
 587                 printf("--%s--\n", sep);
 588                 sep = "-";
 589                 if (msg >= nextmsg) {
 590                         nextmsg = msg + 1;
 591                         rewind(msgsrc);
 592                         fprintf(msgsrc, "%d\n", nextmsg);
 593                         fflush(msgsrc);
 594                 }
 595                 if (newmsg)
 596                         fclose(newmsg);
 597                 if (quitit)
 598                         break;
 599         }
 600
 601         /*
 602          * Make sure .rc file gets updated
 603          */
 604         if (--msg >= nextmsg) {
 605                 nextmsg = msg + 1;
 606                 rewind(msgsrc);
 607                 fprintf(msgsrc, "%d\n", nextmsg);
 608                 fflush(msgsrc);
 609         }
 610         if (already && !quitit && lastcmd && totty) {
 611                 /*
 612                  * save or reply to last message?
 613                  */
 614                 msg = prevmsg;
 615                 ask(NOMORE);
 616                 if (inbuf[0] == '-' || isdigit(inbuf[0]))
 617                         goto cmnd;
 618         }
 619         if (!(already || hush || qopt))
 620                 printf("No new messages.\n");
 621         exit(0);
 622         /* NOTREACHED */
 623 }
 624
 625 static void
 626 usage(void)
 627 {
 628         fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
 629         exit(1);
 630 }
 631
 632 static void
 633 prmesg(int length)
 634 {
 635         FILE *outf;
 636         char *env_pager;
 637
 638         if (use_pager && length > Lpp) {
 639                 signal(SIGPIPE, SIG_IGN);
 640                 signal(SIGQUIT, SIG_IGN);
 641                 if ((env_pager = getenv("PAGER")) == NULL) {
 642                         snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
 643                 } else {
 644                         snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
 645                 }
 646                 outf = popen(cmdbuf, "w");
 647                 if (!outf)
 648                         outf = stdout;
 649                 else
 650                         setbuf(outf, (char *)NULL);
 651         }
 652         else
 653                 outf = stdout;
 654
 655         if (seensubj)
 656                 putc('\n', outf);
 657
 658         while (fgets(inbuf, sizeof inbuf, newmsg)) {
 659                 fputs(inbuf, outf);
 660                 if (ferror(outf)) {
 661                         clearerr(outf);
 662                         break;
 663                 }
 664         }
 665
 666         if (outf != stdout) {
 667                 pclose(outf);
 668                 signal(SIGPIPE, SIG_DFL);
 669                 signal(SIGQUIT, SIG_DFL);
 670         }
 671         else {
 672                 fflush(stdout);
 673         }
 674
 675         /* force wait on output */
 676         tcdrain(fileno(stdout));
 677 }
 678
 679 static void
 680 onintr(int unused __unused)
 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                         fseeko(newmsg, (off_t)0, SEEK_END);
 697                 intrpflg = YES;
 698         }
 699 }
 700
 701 /*
 702  * We have just gotten a susp.  Suspend and prepare to resume.
 703  */
 704 static void
 705 onsusp(int unused __unused)
 706 {
 707         signal(SIGTSTP, SIG_DFL);
 708         sigsetmask(0);
 709         kill(0, SIGTSTP);
 710         signal(SIGTSTP, onsusp);
 711         if (!mailing)
 712                 longjmp(tstpbuf, 0);
 713 }
 714
 715 static int
 716 linecnt(FILE *f)
 717 {
 718         off_t oldpos = ftello(f);
 719         int l = 0;
 720         char lbuf[BUFSIZ];
 721
 722         while (fgets(lbuf, sizeof lbuf, f))
 723                 l++;
 724         clearerr(f);
 725         fseeko(f, oldpos, SEEK_SET);
 726         return (l);
 727 }
 728
 729 static int
 730 next(char *buf)
 731 {
 732         int i;
 733         sscanf(buf, "%d", &i);
 734         sprintf(buf, "Goto %d", i);
 735         return(--i);
 736 }
 737
 738 static void
 739 ask(const char *prompt)
 740 {
 741         char    inch;
 742         int     n, cmsg, fd;
 743         off_t   oldpos;
 744         FILE    *cpfrom, *cpto;
 745
 746         printf("%s ", prompt);
 747         fflush(stdout);
 748         intrpflg = NO;
 749         (void) fgets(inbuf, sizeof inbuf, stdin);
 750         if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
 751                 inbuf[n - 1] = '\0';
 752         if (intrpflg)
 753                 inbuf[0] = 'x';
 754
 755         /*
 756          * Handle 'mail' and 'save' here.
 757          */
 758         if ((inch = inbuf[0]) == 's' || inch == 'm') {
 759                 if (inbuf[1] == '-')
 760                         cmsg = prevmsg;
 761                 else if (isdigit(inbuf[1]))
 762                         cmsg = atoi(&inbuf[1]);
 763                 else
 764                         cmsg = msg;
 765                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
 766
 767                 oldpos = ftello(newmsg);
 768
 769                 cpfrom = fopen(fname, "r");
 770                 if (!cpfrom) {
 771                         printf("Message %d not found\n", cmsg);
 772                         ask (prompt);
 773                         return;
 774                 }
 775
 776                 if (inch == 's') {
 777                         in = nxtfld(inbuf);
 778                         if (*in) {
 779                                 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
 780                                         fname[n] = in[n];
 781                                 }
 782                                 fname[n] = '\0';
 783                         }
 784                         else
 785                                 strcpy(fname, "Messages");
 786                         fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
 787                 }
 788                 else {
 789                         strcpy(fname, _PATH_TMP);
 790                         fd = mkstemp(fname);
 791                         if (fd != -1) {
 792                                 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
 793                                     fname);
 794                                 mailing = YES;
 795                         }
 796                 }
 797                 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
 798                         if (fd != -1)
 799                                 close(fd);
 800                         warn("%s", fname);
 801                         mailing = NO;
 802                         fseeko(newmsg, oldpos, SEEK_SET);
 803                         ask(prompt);
 804                         return;
 805                 }
 806
 807                 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
 808                         fwrite(inbuf, 1, n, cpto);
 809
 810                 fclose(cpfrom);
 811                 fclose(cpto);
 812                 fseeko(newmsg, oldpos, SEEK_SET);/* reposition current message */
 813                 if (inch == 's')
 814                         printf("Message %d saved in \"%s\"\n", cmsg, fname);
 815                 else {
 816                         system(cmdbuf);
 817                         unlink(fname);
 818                         mailing = NO;
 819                 }
 820                 ask(prompt);
 821         }
 822 }
 823
 824 static void
 825 gfrsub(FILE *infile)
 826 {
 827         off_t frompos;
 828         int count;
 829
 830         seensubj = seenfrom = NO;
 831         local = YES;
 832         subj[0] = from[0] = date[0] = '\0';
 833
 834         /*
 835          * Is this a normal message?
 836          */
 837         if (fgets(inbuf, sizeof inbuf, infile)) {
 838                 if (strncmp(inbuf, "From", 4)==0) {
 839                         /*
 840                          * expected form starts with From
 841                          */
 842                         seenfrom = YES;
 843                         frompos = ftello(infile);
 844                         ptr = from;
 845                         in = nxtfld(inbuf);
 846                         if (*in) {
 847                                 count = sizeof(from) - 1;
 848                                 while (*in && *in > ' ' && count-- > 0) {
 849                                         if (*in == ':' || *in == '@' ||
 850                                             *in == '!')
 851                                                 local = NO;
 852                                         *ptr++ = *in++;
 853                                 }
 854                         }
 855                         *ptr = '\0';
 856                         if (*(in = nxtfld(in)))
 857                                 strncpy(date, in, sizeof date);
 858                         else {
 859                                 date[0] = '\n';
 860                                 date[1] = '\0';
 861                         }
 862                 }
 863                 else {
 864                         /*
 865                          * not the expected form
 866                          */
 867                         rewind(infile);
 868                         return;
 869                 }
 870         }
 871         else
 872                 /*
 873                  * empty file ?
 874                  */
 875                 return;
 876
 877         /*
 878          * look for Subject line until EOF or a blank line
 879          */
 880         while (fgets(inbuf, sizeof inbuf, infile)
 881             && !(blankline = (inbuf[0] == '\n'))) {
 882                 /*
 883                  * extract Subject line
 884                  */
 885                 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
 886                         seensubj = YES;
 887                         frompos = ftello(infile);
 888                         strncpy(subj, nxtfld(inbuf), sizeof subj);
 889                 }
 890         }
 891         if (!blankline)
 892                 /*
 893                  * ran into EOF
 894                  */
 895                 fseeko(infile, frompos, SEEK_SET);
 896
 897         if (!seensubj)
 898                 /*
 899                  * for possible use with Mail
 900                  */
 901                 strncpy(subj, "(No Subject)\n", sizeof subj);
 902 }
 903
 904 static char *
 905 nxtfld(char *s)
 906 {
 907         if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
 908         if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
 909         return (s);
 910 }