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         char *cp;
 175
 176 #ifdef UNBUFFERED
 177         setbuf(stdout, NULL);
 178 #endif
 179         setlocale(LC_ALL, "");
 180
 181         time(&t);
 182         if (setuid(uid = getuid()) != 0)
 183                 err(1, "setuid failed");
 184         ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
 185         if (ruptible)
 186                 signal(SIGINT, SIG_DFL);
 187
 188         argc--, argv++;
 189         while (argc > 0) {
 190                 if (isdigit(argv[0][0])) {      /* starting message # */
 191                         rcfirst = atoi(argv[0]);
 192                 }
 193                 else if (isdigit(argv[0][1])) { /* backward offset */
 194                         rcback = atoi( &( argv[0][1] ) );
 195                 }
 196                 else {
 197                         ptr = *argv;
 198                         while (*ptr) switch (*ptr++) {
 199
 200                         case '-':
 201                                 break;
 202
 203                         case 'c':
 204                                 if (uid != SUPERUSER && uid != DAEMON)
 205                                         errx(1,
 206                                 "only the super-user can use the c flag");
 207                                 clean = YES;
 208                                 break;
 209
 210                         case 'f':               /* silently */
 211                                 hush = YES;
 212                                 break;
 213
 214                         case 'h':               /* headers only */
 215                                 hdrs = YES;
 216                                 break;
 217
 218                         case 'l':               /* local msgs only */
 219                                 locomode = YES;
 220                                 break;
 221
 222                         case 'o':               /* option to save last message */
 223                                 lastcmd = YES;
 224                                 break;
 225
 226                         case 'p':               /* pipe thru 'more' during long msgs */
 227                                 use_pager = YES;
 228                                 break;
 229
 230                         case 'q':               /* query only */
 231                                 qopt = YES;
 232                                 break;
 233
 234                         case 's':               /* sending TO msgs */
 235                                 send_msg = YES;
 236                                 break;
 237
 238                         default:
 239                                 usage();
 240                         }
 241                 }
 242                 argc--, argv++;
 243         }
 244
 245         /*
 246          * determine current message bounds
 247          */
 248         snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS);
 249
 250         /*
 251          * Test access rights to the bounds file
 252          * This can be a little tricky.  if(send_msg), then
 253          * we will create it.  We assume that if(send_msg),
 254          * then you have write permission there.
 255          * Else, it better be there, or we bail.
 256          */
 257         if (send_msg != YES) {
 258                 if (stat(fname, &buf) < 0) {
 259                         if (hush != YES) {
 260                                 err(errno, "%s", fname);
 261                         } else {
 262                                 exit(1);
 263                         }
 264                 }
 265         }
 266         bounds = fopen(fname, "r");
 267
 268         if (bounds != NULL) {
 269                 fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg);
 270                 fclose(bounds);
 271                 blast = lastmsg;        /* save upper bound */
 272         }
 273
 274         if (clean)
 275                 keep = t - (rcback? rcback : NDAYS) DAYS;
 276
 277         if (clean || bounds == NULL) {  /* relocate message bounds */
 278                 struct dirent *dp;
 279                 struct stat stbuf;
 280                 bool seenany = NO;
 281                 DIR     *dirp;
 282
 283                 dirp = opendir(_PATH_MSGS);
 284                 if (dirp == NULL)
 285                         err(errno, "%s", _PATH_MSGS);
 286
 287                 firstmsg = 32767;
 288                 lastmsg = 0;
 289
 290                 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
 291                         cp = dp->d_name;
 292                         int i = 0;
 293
 294                         if (dp->d_ino == 0)
 295                                 continue;
 296                         if (dp->d_namlen == 0)
 297                                 continue;
 298
 299                         if (clean)
 300                                 snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp);
 301
 302                         while (isdigit(*cp))
 303                                 i = i * 10 + *cp++ - '0';
 304                         if (*cp)
 305                                 continue;       /* not a message! */
 306
 307                         if (clean) {
 308                                 if (stat(inbuf, &stbuf) != 0)
 309                                         continue;
 310                                 if (stbuf.st_mtime < keep
 311                                     && stbuf.st_mode&S_IWRITE) {
 312                                         unlink(inbuf);
 313                                         continue;
 314                                 }
 315                         }
 316
 317                         if (i > lastmsg)
 318                                 lastmsg = i;
 319                         if (i < firstmsg)
 320                                 firstmsg = i;
 321                         seenany = YES;
 322                 }
 323                 closedir(dirp);
 324
 325                 if (!seenany) {
 326                         if (blast != 0) /* never lower the upper bound! */
 327                                 lastmsg = blast;
 328                         firstmsg = lastmsg + 1;
 329                 }
 330                 else if (blast > lastmsg)
 331                         lastmsg = blast;
 332
 333                 if (!send_msg) {
 334                         bounds = fopen(fname, "w");
 335                         if (bounds == NULL)
 336                                 err(errno, "%s", fname);
 337                         chmod(fname, CMODE);
 338                         fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
 339                         fclose(bounds);
 340                 }
 341         }
 342
 343         if (send_msg) {
 344                 /*
 345                  * Send mode - place msgs in _PATH_MSGS
 346                  */
 347                 bounds = fopen(fname, "w");
 348                 if (bounds == NULL)
 349                         err(errno, "%s", fname);
 350
 351                 nextmsg = lastmsg + 1;
 352                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg);
 353                 newmsg = fopen(fname, "w");
 354                 if (newmsg == NULL)
 355                         err(errno, "%s", fname);
 356                 chmod(fname, CMODE);
 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                         ptr = getpwuid(uid)->pw_name;
 367                         printf("Message %d:\nFrom %s %sSubject: ",
 368                                 nextmsg, ptr, ctime(&t));
 369                         fflush(stdout);
 370                         fgets(inbuf, sizeof inbuf, stdin);
 371                         putchar('\n');
 372                         fflush(stdout);
 373                         fprintf(newmsg, "From %s %sSubject: %s\n",
 374                                 ptr, ctime(&t), inbuf);
 375                         blankline = seensubj = YES;
 376                 }
 377                 else
 378                         blankline = seensubj = NO;
 379                 for (;;) {
 380                         fgets(inbuf, sizeof inbuf, stdin);
 381                         if (feof(stdin) || ferror(stdin))
 382                                 break;
 383                         blankline = (blankline || (inbuf[0] == '\n'));
 384                         seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
 385                         fputs(inbuf, newmsg);
 386                 }
 387 #ifdef OBJECT
 388                 if (!seensubj) {
 389                         printf("NOTICE: Messages should have a Subject field!\n");
 390 #ifdef REJECT
 391                         unlink(fname);
 392 #endif
 393                         exit(1);
 394                 }
 395 #endif
 396                 exit(ferror(stdin));
 397         }
 398         if (clean)
 399                 exit(0);
 400
 401         /*
 402          * prepare to display messages
 403          */
 404         totty = (isatty(fileno(stdout)) != 0);
 405         use_pager = use_pager && totty;
 406
 407         if ((cp = getenv("HOME")) == NULL || *cp == '\0') {
 408                 fprintf(stderr, "Error, no home directory!\n");
 409                 exit(1);
 410         }
 411         snprintf(fname, sizeof(fname), "%s/%s", cp, MSGSRC);
 412         msgsrc = fopen(fname, "r");
 413         if (msgsrc) {
 414                 newrc = NO;
 415                 fscanf(msgsrc, "%d\n", &nextmsg);
 416                 fclose(msgsrc);
 417                 if (nextmsg > lastmsg+1) {
 418                         printf("Warning: bounds have been reset (%d, %d)\n",
 419                                 firstmsg, lastmsg);
 420                         truncate(fname, (off_t)0);
 421                         newrc = YES;
 422                 }
 423                 else if (!rcfirst)
 424                         rcfirst = nextmsg - rcback;
 425         }
 426         else
 427                 newrc = YES;
 428         msgsrc = fopen(fname, "r+");
 429         if (msgsrc == NULL)
 430                 msgsrc = fopen(fname, "w");
 431         if (msgsrc == NULL)
 432                 err(errno, "%s", fname);
 433         if (rcfirst) {
 434                 if (rcfirst > lastmsg+1) {
 435                         printf("Warning: the last message is number %d.\n",
 436                                 lastmsg);
 437                         rcfirst = nextmsg;
 438                 }
 439                 if (rcfirst > firstmsg)
 440                         firstmsg = rcfirst;     /* don't set below first msg */
 441         }
 442         if (newrc) {
 443                 nextmsg = firstmsg;
 444                 rewind(msgsrc);
 445                 fprintf(msgsrc, "%d\n", nextmsg);
 446                 fflush(msgsrc);
 447         }
 448
 449 #ifdef V7
 450         if (totty) {
 451                 struct winsize win;
 452                 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
 453                         Lpp = win.ws_row;
 454                 if (Lpp <= 0) {
 455                         if (tgetent(inbuf, getenv("TERM")) <= 0
 456                             || (Lpp = tgetnum("li")) <= 0) {
 457                                 Lpp = NLINES;
 458                         }
 459                 }
 460         }
 461 #endif
 462         Lpp -= 6;       /* for headers, etc. */
 463
 464         already = NO;
 465         prevmsg = firstmsg;
 466         printing = YES;
 467         if (ruptible)
 468                 signal(SIGINT, onintr);
 469
 470         /*
 471          * Main program loop
 472          */
 473         for (msg = firstmsg; msg <= lastmsg; msg++) {
 474
 475                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
 476                 newmsg = fopen(fname, "r");
 477                 if (newmsg == NULL)
 478                         continue;
 479
 480                 gfrsub(newmsg);         /* get From and Subject fields */
 481                 if (locomode && !local) {
 482                         fclose(newmsg);
 483                         continue;
 484                 }
 485
 486                 if (qopt) {     /* This has to be located here */
 487                         printf("There are new messages.\n");
 488                         exit(0);
 489                 }
 490
 491                 if (already && !hdrs)
 492                         putchar('\n');
 493
 494                 /*
 495                  * Print header
 496                  */
 497                 if (totty)
 498                         signal(SIGTSTP, onsusp);
 499                 (void) setjmp(tstpbuf);
 500                 already = YES;
 501                 nlines = 2;
 502                 if (seenfrom) {
 503                         printf("Message %d:\nFrom %s %s", msg, from, date);
 504                         nlines++;
 505                 }
 506                 if (seensubj) {
 507                         printf("Subject: %s", subj);
 508                         nlines++;
 509                 }
 510                 else {
 511                         if (seenfrom) {
 512                                 putchar('\n');
 513                                 nlines++;
 514                         }
 515                         while (nlines < 6
 516                             && fgets(inbuf, sizeof inbuf, newmsg)
 517                             && inbuf[0] != '\n') {
 518                                 fputs(inbuf, stdout);
 519                                 nlines++;
 520                         }
 521                 }
 522
 523                 lct = linecnt(newmsg);
 524                 if (lct)
 525                         printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
 526                             (lct == 1) ? "" : "s");
 527
 528                 if (hdrs) {
 529                         printf("\n-----\n");
 530                         fclose(newmsg);
 531                         continue;
 532                 }
 533
 534                 /*
 535                  * Ask user for command
 536                  */
 537                 if (totty)
 538                         ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
 539                 else
 540                         inbuf[0] = 'y';
 541                 if (totty)
 542                         signal(SIGTSTP, SIG_DFL);
 543 cmnd:
 544                 in = inbuf;
 545                 switch (*in) {
 546                         case 'x':
 547                                 /* FALLTHROUGH */
 548                         case 'X':
 549                                 exit(0);
 550                                 /* NOTREACHED */
 551
 552                         case 'q':
 553                                 /* FALLTHROUGH */
 554                         case 'Q':
 555                                 quitit = YES;
 556                                 printf("--Postponed--\n");
 557                                 exit(0);
 558                                 /* NOTREACHED */
 559
 560                         case 'n':
 561                                 /* FALLTHROUGH */
 562                         case 'N':
 563                                 if (msg >= nextmsg) sep = "Flushed";
 564                                 prevmsg = msg;
 565                                 break;
 566
 567                         case 'p':
 568                                 /* FALLTHROUGH */
 569                         case 'P':
 570                                 use_pager = (*in++ == 'p');
 571                                 /* FALLTHROUGH */
 572                         case '\n':
 573                                 /* FALLTHROUGH */
 574                         case 'y':
 575                         default:
 576                                 if (*in == '-') {
 577                                         msg = prevmsg-1;
 578                                         sep = "replay";
 579                                         break;
 580                                 }
 581                                 if (isdigit(*in)) {
 582                                         msg = next(in);
 583                                         sep = in;
 584                                         break;
 585                                 }
 586
 587                                 prmesg(nlines + lct + (seensubj? 1 : 0));
 588                                 prevmsg = msg;
 589
 590                 }
 591
 592                 printf("--%s--\n", sep);
 593                 sep = "-";
 594                 if (msg >= nextmsg) {
 595                         nextmsg = msg + 1;
 596                         rewind(msgsrc);
 597                         fprintf(msgsrc, "%d\n", nextmsg);
 598                         fflush(msgsrc);
 599                 }
 600                 if (newmsg)
 601                         fclose(newmsg);
 602                 if (quitit)
 603                         break;
 604         }
 605
 606         /*
 607          * Make sure .rc file gets updated
 608          */
 609         if (--msg >= nextmsg) {
 610                 nextmsg = msg + 1;
 611                 rewind(msgsrc);
 612                 fprintf(msgsrc, "%d\n", nextmsg);
 613                 fflush(msgsrc);
 614         }
 615         if (already && !quitit && lastcmd && totty) {
 616                 /*
 617                  * save or reply to last message?
 618                  */
 619                 msg = prevmsg;
 620                 ask(NOMORE);
 621                 if (inbuf[0] == '-' || isdigit(inbuf[0]))
 622                         goto cmnd;
 623         }
 624         if (!(already || hush || qopt))
 625                 printf("No new messages.\n");
 626         exit(0);
 627         /* NOTREACHED */
 628 }
 629
 630 static void
 631 usage(void)
 632 {
 633         fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
 634         exit(1);
 635 }
 636
 637 static void
 638 prmesg(int length)
 639 {
 640         FILE *outf;
 641         char *env_pager;
 642
 643         if (use_pager && length > Lpp) {
 644                 signal(SIGPIPE, SIG_IGN);
 645                 signal(SIGQUIT, SIG_IGN);
 646                 if ((env_pager = getenv("PAGER")) == NULL) {
 647                         snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
 648                 } else {
 649                         snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
 650                 }
 651                 outf = popen(cmdbuf, "w");
 652                 if (!outf)
 653                         outf = stdout;
 654                 else
 655                         setbuf(outf, (char *)NULL);
 656         }
 657         else
 658                 outf = stdout;
 659
 660         if (seensubj)
 661                 putc('\n', outf);
 662
 663         while (fgets(inbuf, sizeof inbuf, newmsg)) {
 664                 fputs(inbuf, outf);
 665                 if (ferror(outf)) {
 666                         clearerr(outf);
 667                         break;
 668                 }
 669         }
 670
 671         if (outf != stdout) {
 672                 pclose(outf);
 673                 signal(SIGPIPE, SIG_DFL);
 674                 signal(SIGQUIT, SIG_DFL);
 675         }
 676         else {
 677                 fflush(stdout);
 678         }
 679
 680         /* force wait on output */
 681         tcdrain(fileno(stdout));
 682 }
 683
 684 static void
 685 onintr(int unused __unused)
 686 {
 687         signal(SIGINT, onintr);
 688         if (mailing)
 689                 unlink(fname);
 690         if (sending) {
 691                 unlink(fname);
 692                 puts("--Killed--");
 693                 exit(1);
 694         }
 695         if (printing) {
 696                 putchar('\n');
 697                 if (hdrs)
 698                         exit(0);
 699                 sep = "Interrupt";
 700                 if (newmsg)
 701                         fseeko(newmsg, (off_t)0, SEEK_END);
 702                 intrpflg = YES;
 703         }
 704 }
 705
 706 /*
 707  * We have just gotten a susp.  Suspend and prepare to resume.
 708  */
 709 static void
 710 onsusp(int unused __unused)
 711 {
 712         signal(SIGTSTP, SIG_DFL);
 713         sigsetmask(0);
 714         kill(0, SIGTSTP);
 715         signal(SIGTSTP, onsusp);
 716         if (!mailing)
 717                 longjmp(tstpbuf, 0);
 718 }
 719
 720 static int
 721 linecnt(FILE *f)
 722 {
 723         off_t oldpos = ftello(f);
 724         int l = 0;
 725         char lbuf[BUFSIZ];
 726
 727         while (fgets(lbuf, sizeof lbuf, f))
 728                 l++;
 729         clearerr(f);
 730         fseeko(f, oldpos, SEEK_SET);
 731         return (l);
 732 }
 733
 734 static int
 735 next(char *buf)
 736 {
 737         int i;
 738         sscanf(buf, "%d", &i);
 739         sprintf(buf, "Goto %d", i);
 740         return(--i);
 741 }
 742
 743 static void
 744 ask(const char *prompt)
 745 {
 746         char    inch;
 747         int     n, cmsg, fd;
 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') {
 764                 if (inbuf[1] == '-')
 765                         cmsg = prevmsg;
 766                 else if (isdigit(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 = ftello(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                                 strcpy(fname, "Messages");
 791                         fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
 792                 }
 793                 else {
 794                         strcpy(fname, _PATH_TMP);
 795                         fd = mkstemp(fname);
 796                         if (fd != -1) {
 797                                 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
 798                                     fname);
 799                                 mailing = YES;
 800                         }
 801                 }
 802                 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
 803                         if (fd != -1)
 804                                 close(fd);
 805                         warn("%s", fname);
 806                         mailing = NO;
 807                         fseeko(newmsg, oldpos, SEEK_SET);
 808                         ask(prompt);
 809                         return;
 810                 }
 811
 812                 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
 813                         fwrite(inbuf, 1, n, cpto);
 814
 815                 fclose(cpfrom);
 816                 fclose(cpto);
 817                 fseeko(newmsg, oldpos, SEEK_SET);/* 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 static void
 830 gfrsub(FILE *infile)
 831 {
 832         off_t frompos;
 833         int count;
 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 = ftello(infile);
 849                         ptr = from;
 850                         in = nxtfld(inbuf);
 851                         if (*in) {
 852                                 count = sizeof(from) - 1;
 853                                 while (*in && *in > ' ' && count-- > 0) {
 854                                         if (*in == ':' || *in == '@' ||
 855                                             *in == '!')
 856                                                 local = NO;
 857                                         *ptr++ = *in++;
 858                                 }
 859                         }
 860                         *ptr = '\0';
 861                         if (*(in = nxtfld(in)))
 862                                 strncpy(date, in, sizeof date);
 863                         else {
 864                                 date[0] = '\n';
 865                                 date[1] = '\0';
 866                         }
 867                 }
 868                 else {
 869                         /*
 870                          * not the expected form
 871                          */
 872                         rewind(infile);
 873                         return;
 874                 }
 875         }
 876         else
 877                 /*
 878                  * empty file ?
 879                  */
 880                 return;
 881
 882         /*
 883          * look for Subject line until EOF or a blank line
 884          */
 885         while (fgets(inbuf, sizeof inbuf, infile)
 886             && !(blankline = (inbuf[0] == '\n'))) {
 887                 /*
 888                  * extract Subject line
 889                  */
 890                 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
 891                         seensubj = YES;
 892                         frompos = ftello(infile);
 893                         strncpy(subj, nxtfld(inbuf), sizeof subj);
 894                 }
 895         }
 896         if (!blankline)
 897                 /*
 898                  * ran into EOF
 899                  */
 900                 fseeko(infile, frompos, SEEK_SET);
 901
 902         if (!seensubj)
 903                 /*
 904                  * for possible use with Mail
 905                  */
 906                 strncpy(subj, "(No Subject)\n", sizeof subj);
 907 }
 908
 909 static char *
 910 nxtfld(char *s)
 911 {
 912         if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
 913         if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
 914         return (s);
 915 }