usr.bin/msgs/msgs.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #ifndef lint
  33 static const char copyright[] =
  34 "@(#) Copyright (c) 1980, 1993\n\
  35         The Regents of the University of California.  All rights reserved.\n";
  36 #endif /* not lint */
  37
  38 #if 0
  39 #ifndef lint
  40 static char sccsid[] = "@(#)msgs.c      8.2 (Berkeley) 4/28/95";
  41 #endif /* not lint */
  42 #endif
  43
  44 #include <sys/cdefs.h>
  45 __FBSDID("$FreeBSD$");
  46
  47 /*
  48  * msgs - a user bulletin board program
  49  *
  50  * usage:
  51  *      msgs [fhlopq] [[-]number]       to read messages
  52  *      msgs -s                         to place messages
  53  *      msgs -c [-days]                 to clean up the bulletin board
  54  *
  55  * prompt commands are:
  56  *      y       print message
  57  *      n       flush message, go to next message
  58  *      q       flush message, quit
  59  *      p       print message, turn on 'pipe thru more' mode
  60  *      P       print message, turn off 'pipe thru more' mode
  61  *      -       reprint last message
  62  *      s[-][<num>] [<filename>]        save message
  63  *      m[-][<num>]     mail with message in temp mbox
  64  *      x       exit without flushing this message
  65  *      <num>   print message number <num>
  66  */
  67
  68 #define V7              /* will look for TERM in the environment */
  69 #define OBJECT          /* will object to messages without Subjects */
  70 /* #define REJECT */    /* will reject messages without Subjects
  71                            (OBJECT must be defined also) */
  72 /* #define UNBUFFERED *//* use unbuffered output */
  73
  74 #include <sys/param.h>
  75 #include <sys/stat.h>
  76 #include <ctype.h>
  77 #include <dirent.h>
  78 #include <err.h>
  79 #include <errno.h>
  80 #include <fcntl.h>
  81 #include <locale.h>
  82 #include <pwd.h>
  83 #include <setjmp.h>
  84 #include <termcap.h>
  85 #include <termios.h>
  86 #include <signal.h>
  87 #include <stdio.h>
  88 #include <stdlib.h>
  89 #include <string.h>
  90 #include <time.h>
  91 #include <unistd.h>
  92 #include "pathnames.h"
  93
  94 #define CMODE   0644            /* bounds file creation mode */
  95 #define NO      0
  96 #define YES     1
  97 #define SUPERUSER       0       /* superuser uid */
  98 #define DAEMON          1       /* daemon uid */
  99 #define NLINES  24              /* default number of lines/crt screen */
 100 #define NDAYS   21              /* default keep time for messages */
 101 #define DAYS    *24*60*60       /* seconds/day */
 102 #define MSGSRC  ".msgsrc"       /* user's rc file */
 103 #define BOUNDS  "bounds"        /* message bounds file */
 104 #define NEXT    "Next message? [yq]"
 105 #define MORE    "More? [ynq]"
 106 #define NOMORE  "(No more) [q] ?"
 107
 108 typedef char    bool;
 109
 110 static FILE     *msgsrc;
 111 static FILE     *newmsg;
 112 static const char *sep = "-";
 113 static char     inbuf[BUFSIZ];
 114 static char     fname[MAXPATHLEN];
 115 static char     cmdbuf[MAXPATHLEN + MAXPATHLEN];
 116 static char     subj[128];
 117 static char     from[128];
 118 static char     date[128];
 119 static char     *ptr;
 120 static char     *in;
 121 static bool     local;
 122 static bool     ruptible;
 123 static bool     totty;
 124 static bool     seenfrom;
 125 static bool     seensubj;
 126 static bool     blankline;
 127 static bool     printing = NO;
 128 static bool     mailing = NO;
 129 static bool     quitit = NO;
 130 static bool     sending = NO;
 131 static bool     intrpflg = NO;
 132 static uid_t    uid;
 133 static int      msg;
 134 static int      prevmsg;
 135 static int      lct;
 136 static int      nlines;
 137 static int      Lpp = 0;
 138 static time_t   t;
 139 static time_t   keep;
 140
 141 /* option initialization */
 142 static bool     hdrs = NO;
 143 static bool     qopt = NO;
 144 static bool     hush = NO;
 145 static bool     send_msg = NO;
 146 static bool     locomode = NO;
 147 static bool     use_pager = NO;
 148 static bool     clean = NO;
 149 static bool     lastcmd = NO;
 150 static jmp_buf  tstpbuf;
 151
 152 static void     ask(const char *);
 153 static void     gfrsub(FILE *);
 154 static int      linecnt(FILE *);
 155 static int      next(char *);
 156 static char     *nxtfld(char *);
 157 static void     onsusp(int);
 158 static void     onintr(int);
 159 static void     prmesg(int);
 160 static void     usage(void);
 161
 162 int
 163 main(int argc, char *argv[])
 164 {
 165         bool newrc, already;
 166         int rcfirst = 0;                /* first message to print (from .rc) */
 167         int rcback = 0;                 /* amount to back off of rcfirst */
 168         int firstmsg = 0, nextmsg = 0, lastmsg = 0;
 169         int blast = 0;
 170         struct stat buf;                /* stat to check access of bounds */
 171         FILE *bounds;
 172         char *cp;
 173
 174 #ifdef UNBUFFERED
 175         setbuf(stdout, NULL);
 176 #endif
 177         setlocale(LC_ALL, "");
 178
 179         time(&t);
 180         if (setuid(uid = getuid()) != 0)
 181                 err(1, "setuid failed");
 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                         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         if ((cp = getenv("HOME")) == NULL || *cp == '\0') {
 406                 fprintf(stderr, "Error, no home directory!\n");
 407                 exit(1);
 408         }
 409         snprintf(fname, sizeof(fname), "%s/%s", cp, MSGSRC);
 410         msgsrc = fopen(fname, "r");
 411         if (msgsrc) {
 412                 newrc = NO;
 413                 fscanf(msgsrc, "%d\n", &nextmsg);
 414                 fclose(msgsrc);
 415                 if (nextmsg > lastmsg+1) {
 416                         printf("Warning: bounds have been reset (%d, %d)\n",
 417                                 firstmsg, lastmsg);
 418                         truncate(fname, (off_t)0);
 419                         newrc = YES;
 420                 }
 421                 else if (!rcfirst)
 422                         rcfirst = nextmsg - rcback;
 423         }
 424         else
 425                 newrc = YES;
 426         msgsrc = fopen(fname, "r+");
 427         if (msgsrc == NULL)
 428                 msgsrc = fopen(fname, "w");
 429         if (msgsrc == NULL)
 430                 err(errno, "%s", fname);
 431         if (rcfirst) {
 432                 if (rcfirst > lastmsg+1) {
 433                         printf("Warning: the last message is number %d.\n",
 434                                 lastmsg);
 435                         rcfirst = nextmsg;
 436                 }
 437                 if (rcfirst > firstmsg)
 438                         firstmsg = rcfirst;     /* don't set below first msg */
 439         }
 440         if (newrc) {
 441                 nextmsg = firstmsg;
 442                 rewind(msgsrc);
 443                 fprintf(msgsrc, "%d\n", nextmsg);
 444                 fflush(msgsrc);
 445         }
 446
 447 #ifdef V7
 448         if (totty) {
 449                 struct winsize win;
 450                 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
 451                         Lpp = win.ws_row;
 452                 if (Lpp <= 0) {
 453                         if (tgetent(inbuf, getenv("TERM")) <= 0
 454                             || (Lpp = tgetnum("li")) <= 0) {
 455                                 Lpp = NLINES;
 456                         }
 457                 }
 458         }
 459 #endif
 460         Lpp -= 6;       /* for headers, etc. */
 461
 462         already = NO;
 463         prevmsg = firstmsg;
 464         printing = YES;
 465         if (ruptible)
 466                 signal(SIGINT, onintr);
 467
 468         /*
 469          * Main program loop
 470          */
 471         for (msg = firstmsg; msg <= lastmsg; msg++) {
 472
 473                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
 474                 newmsg = fopen(fname, "r");
 475                 if (newmsg == NULL)
 476                         continue;
 477
 478                 gfrsub(newmsg);         /* get From and Subject fields */
 479                 if (locomode && !local) {
 480                         fclose(newmsg);
 481                         continue;
 482                 }
 483
 484                 if (qopt) {     /* This has to be located here */
 485                         printf("There are new messages.\n");
 486                         exit(0);
 487                 }
 488
 489                 if (already && !hdrs)
 490                         putchar('\n');
 491
 492                 /*
 493                  * Print header
 494                  */
 495                 if (totty)
 496                         signal(SIGTSTP, onsusp);
 497                 (void) setjmp(tstpbuf);
 498                 already = YES;
 499                 nlines = 2;
 500                 if (seenfrom) {
 501                         printf("Message %d:\nFrom %s %s", msg, from, date);
 502                         nlines++;
 503                 }
 504                 if (seensubj) {
 505                         printf("Subject: %s", subj);
 506                         nlines++;
 507                 }
 508                 else {
 509                         if (seenfrom) {
 510                                 putchar('\n');
 511                                 nlines++;
 512                         }
 513                         while (nlines < 6
 514                             && fgets(inbuf, sizeof inbuf, newmsg)
 515                             && inbuf[0] != '\n') {
 516                                 fputs(inbuf, stdout);
 517                                 nlines++;
 518                         }
 519                 }
 520
 521                 lct = linecnt(newmsg);
 522                 if (lct)
 523                         printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
 524                             (lct == 1) ? "" : "s");
 525
 526                 if (hdrs) {
 527                         printf("\n-----\n");
 528                         fclose(newmsg);
 529                         continue;
 530                 }
 531
 532                 /*
 533                  * Ask user for command
 534                  */
 535                 if (totty)
 536                         ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
 537                 else
 538                         inbuf[0] = 'y';
 539                 if (totty)
 540                         signal(SIGTSTP, SIG_DFL);
 541 cmnd:
 542                 in = inbuf;
 543                 switch (*in) {
 544                         case 'x':
 545                                 /* FALLTHROUGH */
 546                         case 'X':
 547                                 exit(0);
 548                                 /* NOTREACHED */
 549
 550                         case 'q':
 551                                 /* FALLTHROUGH */
 552                         case 'Q':
 553                                 quitit = YES;
 554                                 printf("--Postponed--\n");
 555                                 exit(0);
 556                                 /* NOTREACHED */
 557
 558                         case 'n':
 559                                 /* FALLTHROUGH */
 560                         case 'N':
 561                                 if (msg >= nextmsg) sep = "Flushed";
 562                                 prevmsg = msg;
 563                                 break;
 564
 565                         case 'p':
 566                                 /* FALLTHROUGH */
 567                         case 'P':
 568                                 use_pager = (*in++ == 'p');
 569                                 /* FALLTHROUGH */
 570                         case '\n':
 571                                 /* FALLTHROUGH */
 572                         case 'y':
 573                         default:
 574                                 if (*in == '-') {
 575                                         msg = prevmsg-1;
 576                                         sep = "replay";
 577                                         break;
 578                                 }
 579                                 if (isdigit(*in)) {
 580                                         msg = next(in);
 581                                         sep = in;
 582                                         break;
 583                                 }
 584
 585                                 prmesg(nlines + lct + (seensubj? 1 : 0));
 586                                 prevmsg = msg;
 587
 588                 }
 589
 590                 printf("--%s--\n", sep);
 591                 sep = "-";
 592                 if (msg >= nextmsg) {
 593                         nextmsg = msg + 1;
 594                         rewind(msgsrc);
 595                         fprintf(msgsrc, "%d\n", nextmsg);
 596                         fflush(msgsrc);
 597                 }
 598                 if (newmsg)
 599                         fclose(newmsg);
 600                 if (quitit)
 601                         break;
 602         }
 603
 604         /*
 605          * Make sure .rc file gets updated
 606          */
 607         if (--msg >= nextmsg) {
 608                 nextmsg = msg + 1;
 609                 rewind(msgsrc);
 610                 fprintf(msgsrc, "%d\n", nextmsg);
 611                 fflush(msgsrc);
 612         }
 613         if (already && !quitit && lastcmd && totty) {
 614                 /*
 615                  * save or reply to last message?
 616                  */
 617                 msg = prevmsg;
 618                 ask(NOMORE);
 619                 if (inbuf[0] == '-' || isdigit(inbuf[0]))
 620                         goto cmnd;
 621         }
 622         if (!(already || hush || qopt))
 623                 printf("No new messages.\n");
 624         exit(0);
 625         /* NOTREACHED */
 626 }
 627
 628 static void
 629 usage(void)
 630 {
 631         fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
 632         exit(1);
 633 }
 634
 635 static void
 636 prmesg(int length)
 637 {
 638         FILE *outf;
 639         char *env_pager;
 640
 641         if (use_pager && length > Lpp) {
 642                 signal(SIGPIPE, SIG_IGN);
 643                 signal(SIGQUIT, SIG_IGN);
 644                 if ((env_pager = getenv("PAGER")) == NULL) {
 645                         snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
 646                 } else {
 647                         snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
 648                 }
 649                 outf = popen(cmdbuf, "w");
 650                 if (!outf)
 651                         outf = stdout;
 652                 else
 653                         setbuf(outf, (char *)NULL);
 654         }
 655         else
 656                 outf = stdout;
 657
 658         if (seensubj)
 659                 putc('\n', outf);
 660
 661         while (fgets(inbuf, sizeof inbuf, newmsg)) {
 662                 fputs(inbuf, outf);
 663                 if (ferror(outf)) {
 664                         clearerr(outf);
 665                         break;
 666                 }
 667         }
 668
 669         if (outf != stdout) {
 670                 pclose(outf);
 671                 signal(SIGPIPE, SIG_DFL);
 672                 signal(SIGQUIT, SIG_DFL);
 673         }
 674         else {
 675                 fflush(stdout);
 676         }
 677
 678         /* force wait on output */
 679         tcdrain(fileno(stdout));
 680 }
 681
 682 static void
 683 onintr(int unused __unused)
 684 {
 685         signal(SIGINT, onintr);
 686         if (mailing)
 687                 unlink(fname);
 688         if (sending) {
 689                 unlink(fname);
 690                 puts("--Killed--");
 691                 exit(1);
 692         }
 693         if (printing) {
 694                 putchar('\n');
 695                 if (hdrs)
 696                         exit(0);
 697                 sep = "Interrupt";
 698                 if (newmsg)
 699                         fseeko(newmsg, (off_t)0, SEEK_END);
 700                 intrpflg = YES;
 701         }
 702 }
 703
 704 /*
 705  * We have just gotten a susp.  Suspend and prepare to resume.
 706  */
 707 static void
 708 onsusp(int unused __unused)
 709 {
 710         signal(SIGTSTP, SIG_DFL);
 711         sigsetmask(0);
 712         kill(0, SIGTSTP);
 713         signal(SIGTSTP, onsusp);
 714         if (!mailing)
 715                 longjmp(tstpbuf, 0);
 716 }
 717
 718 static int
 719 linecnt(FILE *f)
 720 {
 721         off_t oldpos = ftello(f);
 722         int l = 0;
 723         char lbuf[BUFSIZ];
 724
 725         while (fgets(lbuf, sizeof lbuf, f))
 726                 l++;
 727         clearerr(f);
 728         fseeko(f, oldpos, SEEK_SET);
 729         return (l);
 730 }
 731
 732 static int
 733 next(char *buf)
 734 {
 735         int i;
 736         sscanf(buf, "%d", &i);
 737         sprintf(buf, "Goto %d", i);
 738         return(--i);
 739 }
 740
 741 static void
 742 ask(const char *prompt)
 743 {
 744         char    inch;
 745         int     n, cmsg, fd;
 746         off_t   oldpos;
 747         FILE    *cpfrom, *cpto;
 748
 749         printf("%s ", prompt);
 750         fflush(stdout);
 751         intrpflg = NO;
 752         (void) fgets(inbuf, sizeof inbuf, stdin);
 753         if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
 754                 inbuf[n - 1] = '\0';
 755         if (intrpflg)
 756                 inbuf[0] = 'x';
 757
 758         /*
 759          * Handle 'mail' and 'save' here.
 760          */
 761         if ((inch = inbuf[0]) == 's' || inch == 'm') {
 762                 if (inbuf[1] == '-')
 763                         cmsg = prevmsg;
 764                 else if (isdigit(inbuf[1]))
 765                         cmsg = atoi(&inbuf[1]);
 766                 else
 767                         cmsg = msg;
 768                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
 769
 770                 oldpos = ftello(newmsg);
 771
 772                 cpfrom = fopen(fname, "r");
 773                 if (!cpfrom) {
 774                         printf("Message %d not found\n", cmsg);
 775                         ask (prompt);
 776                         return;
 777                 }
 778
 779                 if (inch == 's') {
 780                         in = nxtfld(inbuf);
 781                         if (*in) {
 782                                 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
 783                                         fname[n] = in[n];
 784                                 }
 785                                 fname[n] = '\0';
 786                         }
 787                         else
 788                                 strcpy(fname, "Messages");
 789                         fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
 790                 }
 791                 else {
 792                         strcpy(fname, _PATH_TMP);
 793                         fd = mkstemp(fname);
 794                         if (fd != -1) {
 795                                 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
 796                                     fname);
 797                                 mailing = YES;
 798                         }
 799                 }
 800                 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
 801                         if (fd != -1)
 802                                 close(fd);
 803                         warn("%s", fname);
 804                         mailing = NO;
 805                         fseeko(newmsg, oldpos, SEEK_SET);
 806                         ask(prompt);
 807                         fclose(cpfrom);
 808                         return;
 809                 }
 810
 811                 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
 812                         fwrite(inbuf, 1, n, cpto);
 813
 814                 fclose(cpfrom);
 815                 fclose(cpto);
 816                 fseeko(newmsg, oldpos, SEEK_SET);/* reposition current message */
 817                 if (inch == 's')
 818                         printf("Message %d saved in \"%s\"\n", cmsg, fname);
 819                 else {
 820                         system(cmdbuf);
 821                         unlink(fname);
 822                         mailing = NO;
 823                 }
 824                 ask(prompt);
 825         }
 826 }
 827
 828 static void
 829 gfrsub(FILE *infile)
 830 {
 831         off_t frompos;
 832         int count;
 833
 834         seensubj = seenfrom = NO;
 835         local = YES;
 836         subj[0] = from[0] = date[0] = '\0';
 837
 838         /*
 839          * Is this a normal message?
 840          */
 841         if (fgets(inbuf, sizeof inbuf, infile)) {
 842                 if (strncmp(inbuf, "From", 4)==0) {
 843                         /*
 844                          * expected form starts with From
 845                          */
 846                         seenfrom = YES;
 847                         frompos = ftello(infile);
 848                         ptr = from;
 849                         in = nxtfld(inbuf);
 850                         if (*in) {
 851                                 count = sizeof(from) - 1;
 852                                 while (*in && *in > ' ' && count-- > 0) {
 853                                         if (*in == ':' || *in == '@' ||
 854                                             *in == '!')
 855                                                 local = NO;
 856                                         *ptr++ = *in++;
 857                                 }
 858                         }
 859                         *ptr = '\0';
 860                         if (*(in = nxtfld(in)))
 861                                 strlcpy(date, in, sizeof date);
 862                         else {
 863                                 date[0] = '\n';
 864                                 date[1] = '\0';
 865                         }
 866                 }
 867                 else {
 868                         /*
 869                          * not the expected form
 870                          */
 871                         rewind(infile);
 872                         return;
 873                 }
 874         }
 875         else
 876                 /*
 877                  * empty file ?
 878                  */
 879                 return;
 880
 881         /*
 882          * look for Subject line until EOF or a blank line
 883          */
 884         while (fgets(inbuf, sizeof inbuf, infile)
 885             && !(blankline = (inbuf[0] == '\n'))) {
 886                 /*
 887                  * extract Subject line
 888                  */
 889                 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
 890                         seensubj = YES;
 891                         frompos = ftello(infile);
 892                         strlcpy(subj, nxtfld(inbuf), sizeof subj);
 893                 }
 894         }
 895         if (!blankline)
 896                 /*
 897                  * ran into EOF
 898                  */
 899                 fseeko(infile, frompos, SEEK_SET);
 900
 901         if (!seensubj)
 902                 /*
 903                  * for possible use with Mail
 904                  */
 905                 strlcpy(subj, "(No Subject)\n", sizeof subj);
 906 }
 907
 908 static char *
 909 nxtfld(char *s)
 910 {
 911         if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
 912         if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
 913         return (s);
 914 }