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         setuid(uid = getuid());
 183         ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
 184         if (ruptible)
 185                 signal(SIGINT, SIG_DFL);
 186
 187         argc--, argv++;
 188         while (argc > 0) {
 189                 if (isdigit(argv[0][0])) {      /* starting message # */
 190                         rcfirst = atoi(argv[0]);
 191                 }
 192                 else if (isdigit(argv[0][1])) { /* backward offset */
 193                         rcback = atoi( &( argv[0][1] ) );
 194                 }
 195                 else {
 196                         ptr = *argv;
 197                         while (*ptr) switch (*ptr++) {
 198
 199                         case '-':
 200                                 break;
 201
 202                         case 'c':
 203                                 if (uid != SUPERUSER && uid != DAEMON)
 204                                         errx(1,
 205                                 "only the super-user can use the c flag");
 206                                 clean = YES;
 207                                 break;
 208
 209                         case 'f':               /* silently */
 210                                 hush = YES;
 211                                 break;
 212
 213                         case 'h':               /* headers only */
 214                                 hdrs = YES;
 215                                 break;
 216
 217                         case 'l':               /* local msgs only */
 218                                 locomode = YES;
 219                                 break;
 220
 221                         case 'o':               /* option to save last message */
 222                                 lastcmd = YES;
 223                                 break;
 224
 225                         case 'p':               /* pipe thru 'more' during long msgs */
 226                                 use_pager = YES;
 227                                 break;
 228
 229                         case 'q':               /* query only */
 230                                 qopt = YES;
 231                                 break;
 232
 233                         case 's':               /* sending TO msgs */
 234                                 send_msg = YES;
 235                                 break;
 236
 237                         default:
 238                                 usage();
 239                         }
 240                 }
 241                 argc--, argv++;
 242         }
 243
 244         /*
 245          * determine current message bounds
 246          */
 247         snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS);
 248
 249         /*
 250          * Test access rights to the bounds file
 251          * This can be a little tricky.  if(send_msg), then
 252          * we will create it.  We assume that if(send_msg),
 253          * then you have write permission there.
 254          * Else, it better be there, or we bail.
 255          */
 256         if (send_msg != YES) {
 257                 if (stat(fname, &buf) < 0) {
 258                         if (hush != YES) {
 259                                 err(errno, "%s", fname);
 260                         } else {
 261                                 exit(1);
 262                         }
 263                 }
 264         }
 265         bounds = fopen(fname, "r");
 266
 267         if (bounds != NULL) {
 268                 fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg);
 269                 fclose(bounds);
 270                 blast = lastmsg;        /* save upper bound */
 271         }
 272
 273         if (clean)
 274                 keep = t - (rcback? rcback : NDAYS) DAYS;
 275
 276         if (clean || bounds == NULL) {  /* relocate message bounds */
 277                 struct dirent *dp;
 278                 struct stat stbuf;
 279                 bool seenany = NO;
 280                 DIR     *dirp;
 281
 282                 dirp = opendir(_PATH_MSGS);
 283                 if (dirp == NULL)
 284                         err(errno, "%s", _PATH_MSGS);
 285
 286                 firstmsg = 32767;
 287                 lastmsg = 0;
 288
 289                 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
 290                         cp = dp->d_name;
 291                         int i = 0;
 292
 293                         if (dp->d_ino == 0)
 294                                 continue;
 295                         if (dp->d_namlen == 0)
 296                                 continue;
 297
 298                         if (clean)
 299                                 snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp);
 300
 301                         while (isdigit(*cp))
 302                                 i = i * 10 + *cp++ - '0';
 303                         if (*cp)
 304                                 continue;       /* not a message! */
 305
 306                         if (clean) {
 307                                 if (stat(inbuf, &stbuf) != 0)
 308                                         continue;
 309                                 if (stbuf.st_mtime < keep
 310                                     && stbuf.st_mode&S_IWRITE) {
 311                                         unlink(inbuf);
 312                                         continue;
 313                                 }
 314                         }
 315
 316                         if (i > lastmsg)
 317                                 lastmsg = i;
 318                         if (i < firstmsg)
 319                                 firstmsg = i;
 320                         seenany = YES;
 321                 }
 322                 closedir(dirp);
 323
 324                 if (!seenany) {
 325                         if (blast != 0) /* never lower the upper bound! */
 326                                 lastmsg = blast;
 327                         firstmsg = lastmsg + 1;
 328                 }
 329                 else if (blast > lastmsg)
 330                         lastmsg = blast;
 331
 332                 if (!send_msg) {
 333                         bounds = fopen(fname, "w");
 334                         if (bounds == NULL)
 335                                 err(errno, "%s", fname);
 336                         chmod(fname, CMODE);
 337                         fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
 338                         fclose(bounds);
 339                 }
 340         }
 341
 342         if (send_msg) {
 343                 /*
 344                  * Send mode - place msgs in _PATH_MSGS
 345                  */
 346                 bounds = fopen(fname, "w");
 347                 if (bounds == NULL)
 348                         err(errno, "%s", fname);
 349
 350                 nextmsg = lastmsg + 1;
 351                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg);
 352                 newmsg = fopen(fname, "w");
 353                 if (newmsg == NULL)
 354                         err(errno, "%s", fname);
 355                 chmod(fname, CMODE);
 356
 357                 fprintf(bounds, "%d %d\n", firstmsg, nextmsg);
 358                 fclose(bounds);
 359
 360                 sending = YES;
 361                 if (ruptible)
 362                         signal(SIGINT, onintr);
 363
 364                 if (isatty(fileno(stdin))) {
 365                         ptr = getpwuid(uid)->pw_name;
 366                         printf("Message %d:\nFrom %s %sSubject: ",
 367                                 nextmsg, ptr, ctime(&t));
 368                         fflush(stdout);
 369                         fgets(inbuf, sizeof inbuf, stdin);
 370                         putchar('\n');
 371                         fflush(stdout);
 372                         fprintf(newmsg, "From %s %sSubject: %s\n",
 373                                 ptr, ctime(&t), inbuf);
 374                         blankline = seensubj = YES;
 375                 }
 376                 else
 377                         blankline = seensubj = NO;
 378                 for (;;) {
 379                         fgets(inbuf, sizeof inbuf, stdin);
 380                         if (feof(stdin) || ferror(stdin))
 381                                 break;
 382                         blankline = (blankline || (inbuf[0] == '\n'));
 383                         seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
 384                         fputs(inbuf, newmsg);
 385                 }
 386 #ifdef OBJECT
 387                 if (!seensubj) {
 388                         printf("NOTICE: Messages should have a Subject field!\n");
 389 #ifdef REJECT
 390                         unlink(fname);
 391 #endif
 392                         exit(1);
 393                 }
 394 #endif
 395                 exit(ferror(stdin));
 396         }
 397         if (clean)
 398                 exit(0);
 399
 400         /*
 401          * prepare to display messages
 402          */
 403         totty = (isatty(fileno(stdout)) != 0);
 404         use_pager = use_pager && totty;
 405
 406         if ((cp = getenv("HOME")) == NULL || *cp == '\0') {
 407                 fprintf(stderr, "Error, no home directory!\n");
 408                 exit(1);
 409         }
 410         snprintf(fname, sizeof(fname), "%s/%s", cp, MSGSRC);
 411         msgsrc = fopen(fname, "r");
 412         if (msgsrc) {
 413                 newrc = NO;
 414                 fscanf(msgsrc, "%d\n", &nextmsg);
 415                 fclose(msgsrc);
 416                 if (nextmsg > lastmsg+1) {
 417                         printf("Warning: bounds have been reset (%d, %d)\n",
 418                                 firstmsg, lastmsg);
 419                         truncate(fname, (off_t)0);
 420                         newrc = YES;
 421                 }
 422                 else if (!rcfirst)
 423                         rcfirst = nextmsg - rcback;
 424         }
 425         else
 426                 newrc = YES;
 427         msgsrc = fopen(fname, "r+");
 428         if (msgsrc == NULL)
 429                 msgsrc = fopen(fname, "w");
 430         if (msgsrc == NULL)
 431                 err(errno, "%s", fname);
 432         if (rcfirst) {
 433                 if (rcfirst > lastmsg+1) {
 434                         printf("Warning: the last message is number %d.\n",
 435                                 lastmsg);
 436                         rcfirst = nextmsg;
 437                 }
 438                 if (rcfirst > firstmsg)
 439                         firstmsg = rcfirst;     /* don't set below first msg */
 440         }
 441         if (newrc) {
 442                 nextmsg = firstmsg;
 443                 rewind(msgsrc);
 444                 fprintf(msgsrc, "%d\n", nextmsg);
 445                 fflush(msgsrc);
 446         }
 447
 448 #ifdef V7
 449         if (totty) {
 450                 struct winsize win;
 451                 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
 452                         Lpp = win.ws_row;
 453                 if (Lpp <= 0) {
 454                         if (tgetent(inbuf, getenv("TERM")) <= 0
 455                             || (Lpp = tgetnum("li")) <= 0) {
 456                                 Lpp = NLINES;
 457                         }
 458                 }
 459         }
 460 #endif
 461         Lpp -= 6;       /* for headers, etc. */
 462
 463         already = NO;
 464         prevmsg = firstmsg;
 465         printing = YES;
 466         if (ruptible)
 467                 signal(SIGINT, onintr);
 468
 469         /*
 470          * Main program loop
 471          */
 472         for (msg = firstmsg; msg <= lastmsg; msg++) {
 473
 474                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
 475                 newmsg = fopen(fname, "r");
 476                 if (newmsg == NULL)
 477                         continue;
 478
 479                 gfrsub(newmsg);         /* get From and Subject fields */
 480                 if (locomode && !local) {
 481                         fclose(newmsg);
 482                         continue;
 483                 }
 484
 485                 if (qopt) {     /* This has to be located here */
 486                         printf("There are new messages.\n");
 487                         exit(0);
 488                 }
 489
 490                 if (already && !hdrs)
 491                         putchar('\n');
 492
 493                 /*
 494                  * Print header
 495                  */
 496                 if (totty)
 497                         signal(SIGTSTP, onsusp);
 498                 (void) setjmp(tstpbuf);
 499                 already = YES;
 500                 nlines = 2;
 501                 if (seenfrom) {
 502                         printf("Message %d:\nFrom %s %s", msg, from, date);
 503                         nlines++;
 504                 }
 505                 if (seensubj) {
 506                         printf("Subject: %s", subj);
 507                         nlines++;
 508                 }
 509                 else {
 510                         if (seenfrom) {
 511                                 putchar('\n');
 512                                 nlines++;
 513                         }
 514                         while (nlines < 6
 515                             && fgets(inbuf, sizeof inbuf, newmsg)
 516                             && inbuf[0] != '\n') {
 517                                 fputs(inbuf, stdout);
 518                                 nlines++;
 519                         }
 520                 }
 521
 522                 lct = linecnt(newmsg);
 523                 if (lct)
 524                         printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
 525                             (lct == 1) ? "" : "s");
 526
 527                 if (hdrs) {
 528                         printf("\n-----\n");
 529                         fclose(newmsg);
 530                         continue;
 531                 }
 532
 533                 /*
 534                  * Ask user for command
 535                  */
 536                 if (totty)
 537                         ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
 538                 else
 539                         inbuf[0] = 'y';
 540                 if (totty)
 541                         signal(SIGTSTP, SIG_DFL);
 542 cmnd:
 543                 in = inbuf;
 544                 switch (*in) {
 545                         case 'x':
 546                                 /* FALLTHROUGH */
 547                         case 'X':
 548                                 exit(0);
 549                                 /* NOTREACHED */
 550
 551                         case 'q':
 552                                 /* FALLTHROUGH */
 553                         case 'Q':
 554                                 quitit = YES;
 555                                 printf("--Postponed--\n");
 556                                 exit(0);
 557                                 /* NOTREACHED */
 558
 559                         case 'n':
 560                                 /* FALLTHROUGH */
 561                         case 'N':
 562                                 if (msg >= nextmsg) sep = "Flushed";
 563                                 prevmsg = msg;
 564                                 break;
 565
 566                         case 'p':
 567                                 /* FALLTHROUGH */
 568                         case 'P':
 569                                 use_pager = (*in++ == 'p');
 570                                 /* FALLTHROUGH */
 571                         case '\n':
 572                                 /* FALLTHROUGH */
 573                         case 'y':
 574                         default:
 575                                 if (*in == '-') {
 576                                         msg = prevmsg-1;
 577                                         sep = "replay";
 578                                         break;
 579                                 }
 580                                 if (isdigit(*in)) {
 581                                         msg = next(in);
 582                                         sep = in;
 583                                         break;
 584                                 }
 585
 586                                 prmesg(nlines + lct + (seensubj? 1 : 0));
 587                                 prevmsg = msg;
 588
 589                 }
 590
 591                 printf("--%s--\n", sep);
 592                 sep = "-";
 593                 if (msg >= nextmsg) {
 594                         nextmsg = msg + 1;
 595                         rewind(msgsrc);
 596                         fprintf(msgsrc, "%d\n", nextmsg);
 597                         fflush(msgsrc);
 598                 }
 599                 if (newmsg)
 600                         fclose(newmsg);
 601                 if (quitit)
 602                         break;
 603         }
 604
 605         /*
 606          * Make sure .rc file gets updated
 607          */
 608         if (--msg >= nextmsg) {
 609                 nextmsg = msg + 1;
 610                 rewind(msgsrc);
 611                 fprintf(msgsrc, "%d\n", nextmsg);
 612                 fflush(msgsrc);
 613         }
 614         if (already && !quitit && lastcmd && totty) {
 615                 /*
 616                  * save or reply to last message?
 617                  */
 618                 msg = prevmsg;
 619                 ask(NOMORE);
 620                 if (inbuf[0] == '-' || isdigit(inbuf[0]))
 621                         goto cmnd;
 622         }
 623         if (!(already || hush || qopt))
 624                 printf("No new messages.\n");
 625         exit(0);
 626         /* NOTREACHED */
 627 }
 628
 629 static void
 630 usage(void)
 631 {
 632         fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
 633         exit(1);
 634 }
 635
 636 static void
 637 prmesg(int length)
 638 {
 639         FILE *outf;
 640         char *env_pager;
 641
 642         if (use_pager && length > Lpp) {
 643                 signal(SIGPIPE, SIG_IGN);
 644                 signal(SIGQUIT, SIG_IGN);
 645                 if ((env_pager = getenv("PAGER")) == NULL) {
 646                         snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
 647                 } else {
 648                         snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
 649                 }
 650                 outf = popen(cmdbuf, "w");
 651                 if (!outf)
 652                         outf = stdout;
 653                 else
 654                         setbuf(outf, (char *)NULL);
 655         }
 656         else
 657                 outf = stdout;
 658
 659         if (seensubj)
 660                 putc('\n', outf);
 661
 662         while (fgets(inbuf, sizeof inbuf, newmsg)) {
 663                 fputs(inbuf, outf);
 664                 if (ferror(outf)) {
 665                         clearerr(outf);
 666                         break;
 667                 }
 668         }
 669
 670         if (outf != stdout) {
 671                 pclose(outf);
 672                 signal(SIGPIPE, SIG_DFL);
 673                 signal(SIGQUIT, SIG_DFL);
 674         }
 675         else {
 676                 fflush(stdout);
 677         }
 678
 679         /* force wait on output */
 680         tcdrain(fileno(stdout));
 681 }
 682
 683 static void
 684 onintr(int unused __unused)
 685 {
 686         signal(SIGINT, onintr);
 687         if (mailing)
 688                 unlink(fname);
 689         if (sending) {
 690                 unlink(fname);
 691                 puts("--Killed--");
 692                 exit(1);
 693         }
 694         if (printing) {
 695                 putchar('\n');
 696                 if (hdrs)
 697                         exit(0);
 698                 sep = "Interrupt";
 699                 if (newmsg)
 700                         fseeko(newmsg, (off_t)0, SEEK_END);
 701                 intrpflg = YES;
 702         }
 703 }
 704
 705 /*
 706  * We have just gotten a susp.  Suspend and prepare to resume.
 707  */
 708 static void
 709 onsusp(int unused __unused)
 710 {
 711         signal(SIGTSTP, SIG_DFL);
 712         sigsetmask(0);
 713         kill(0, SIGTSTP);
 714         signal(SIGTSTP, onsusp);
 715         if (!mailing)
 716                 longjmp(tstpbuf, 0);
 717 }
 718
 719 static int
 720 linecnt(FILE *f)
 721 {
 722         off_t oldpos = ftello(f);
 723         int l = 0;
 724         char lbuf[BUFSIZ];
 725
 726         while (fgets(lbuf, sizeof lbuf, f))
 727                 l++;
 728         clearerr(f);
 729         fseeko(f, oldpos, SEEK_SET);
 730         return (l);
 731 }
 732
 733 static int
 734 next(char *buf)
 735 {
 736         int i;
 737         sscanf(buf, "%d", &i);
 738         sprintf(buf, "Goto %d", i);
 739         return(--i);
 740 }
 741
 742 static void
 743 ask(const char *prompt)
 744 {
 745         char    inch;
 746         int     n, cmsg, fd;
 747         off_t   oldpos;
 748         FILE    *cpfrom, *cpto;
 749
 750         printf("%s ", prompt);
 751         fflush(stdout);
 752         intrpflg = NO;
 753         (void) fgets(inbuf, sizeof inbuf, stdin);
 754         if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
 755                 inbuf[n - 1] = '\0';
 756         if (intrpflg)
 757                 inbuf[0] = 'x';
 758
 759         /*
 760          * Handle 'mail' and 'save' here.
 761          */
 762         if ((inch = inbuf[0]) == 's' || inch == 'm') {
 763                 if (inbuf[1] == '-')
 764                         cmsg = prevmsg;
 765                 else if (isdigit(inbuf[1]))
 766                         cmsg = atoi(&inbuf[1]);
 767                 else
 768                         cmsg = msg;
 769                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
 770
 771                 oldpos = ftello(newmsg);
 772
 773                 cpfrom = fopen(fname, "r");
 774                 if (!cpfrom) {
 775                         printf("Message %d not found\n", cmsg);
 776                         ask (prompt);
 777                         return;
 778                 }
 779
 780                 if (inch == 's') {
 781                         in = nxtfld(inbuf);
 782                         if (*in) {
 783                                 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
 784                                         fname[n] = in[n];
 785                                 }
 786                                 fname[n] = '\0';
 787                         }
 788                         else
 789                                 strcpy(fname, "Messages");
 790                         fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
 791                 }
 792                 else {
 793                         strcpy(fname, _PATH_TMP);
 794                         fd = mkstemp(fname);
 795                         if (fd != -1) {
 796                                 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
 797                                     fname);
 798                                 mailing = YES;
 799                         }
 800                 }
 801                 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
 802                         if (fd != -1)
 803                                 close(fd);
 804                         warn("%s", fname);
 805                         mailing = NO;
 806                         fseeko(newmsg, oldpos, SEEK_SET);
 807                         ask(prompt);
 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                                 strncpy(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                         strncpy(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                 strncpy(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 }