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 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)msgs.c      8.2 (Berkeley) 4/28/95";
  43 #endif
  44 static const char rcsid[] =
  45   "$FreeBSD: src/usr.bin/msgs/msgs.c,v 1.15.2.2 2003/02/11 21:31:56 mike Exp $";
  46 #endif /* not lint */
  47
  48 /*
  49  * msgs - a user bulletin board program
  50  *
  51  * usage:
  52  *      msgs [fhlopq] [[-]number]       to read messages
  53  *      msgs -s                         to place messages
  54  *      msgs -c [-days]                 to clean up the bulletin board
  55  *
  56  * prompt commands are:
  57  *      y       print message
  58  *      n       flush message, go to next message
  59  *      q       flush message, quit
  60  *      p       print message, turn on 'pipe thru more' mode
  61  *      P       print message, turn off 'pipe thru more' mode
  62  *      -       reprint last message
  63  *      s[-][<num>] [<filename>]        save message
  64  *      m[-][<num>]     mail with message in temp mbox
  65  *      x       exit without flushing this message
  66  *      <num>   print message number <num>
  67  */
  68
  69 #define V7              /* will look for TERM in the environment */
  70 #define OBJECT          /* will object to messages without Subjects */
  71 /* #define REJECT */    /* will reject messages without Subjects
  72                            (OBJECT must be defined also) */
  73 /* #define UNBUFFERED *//* use unbuffered output */
  74
  75 #include <sys/param.h>
  76 #include <sys/stat.h>
  77 #include <ctype.h>
  78 #include <dirent.h>
  79 #include <err.h>
  80 #include <errno.h>
  81 #include <fcntl.h>
  82 #include <locale.h>
  83 #include <pwd.h>
  84 #include <setjmp.h>
  85 #include <termcap.h>
  86 #include <termios.h>
  87 #include <signal.h>
  88 #include <stdio.h>
  89 #include <stdlib.h>
  90 #include <string.h>
  91 #include <time.h>
  92 #include <unistd.h>
  93 #include "pathnames.h"
  94
  95 #define CMODE   0644            /* bounds file creation mode */
  96 #define NO      0
  97 #define YES     1
  98 #define SUPERUSER       0       /* superuser uid */
  99 #define DAEMON          1       /* daemon uid */
 100 #define NLINES  24              /* default number of lines/crt screen */
 101 #define NDAYS   21              /* default keep time for messages */
 102 #define DAYS    *24*60*60       /* seconds/day */
 103 #define MSGSRC  ".msgsrc"       /* user's rc file */
 104 #define BOUNDS  "bounds"        /* message bounds file */
 105 #define NEXT    "Next message? [yq]"
 106 #define MORE    "More? [ynq]"
 107 #define NOMORE  "(No more) [q] ?"
 108
 109 typedef char    bool;
 110
 111 FILE    *msgsrc;
 112 FILE    *newmsg;
 113 char    *sep = "-";
 114 char    inbuf[BUFSIZ];
 115 char    fname[MAXPATHLEN];
 116 char    cmdbuf[MAXPATHLEN + MAXPATHLEN];
 117 char    subj[128];
 118 char    from[128];
 119 char    date[128];
 120 char    *ptr;
 121 char    *in;
 122 bool    local;
 123 bool    ruptible;
 124 bool    totty;
 125 bool    seenfrom;
 126 bool    seensubj;
 127 bool    blankline;
 128 bool    printing = NO;
 129 bool    mailing = NO;
 130 bool    quitit = NO;
 131 bool    sending = NO;
 132 bool    intrpflg = NO;
 133 int     uid;
 134 int     msg;
 135 int     prevmsg;
 136 int     lct;
 137 int     nlines;
 138 int     Lpp = 0;
 139 time_t  t;
 140 time_t  keep;
 141
 142 /* option initialization */
 143 bool    hdrs = NO;
 144 bool    qopt = NO;
 145 bool    hush = NO;
 146 bool    send_msg = NO;
 147 bool    locomode = NO;
 148 bool    use_pager = NO;
 149 bool    clean = NO;
 150 bool    lastcmd = NO;
 151 jmp_buf tstpbuf;
 152
 153
 154 void ask __P((char *));
 155 void gfrsub __P((FILE *));
 156 int linecnt __P((FILE *));
 157 int next __P((char *));
 158 char *nxtfld __P((unsigned char *));
 159 void onsusp __P((int));
 160 void onintr __P((int));
 161 void prmesg __P((int));
 162 static void usage __P((void));
 163
 164 int
 165 main(argc, argv)
 166 int argc; char *argv[];
 167 {
 168         bool newrc, already;
 169         int rcfirst = 0;                /* first message to print (from .rc) */
 170         int rcback = 0;                 /* amount to back off of rcfirst */
 171         int firstmsg = 0, nextmsg = 0, lastmsg = 0;
 172         int blast = 0;
 173         struct stat buf;                /* stat to check access of bounds */
 174         FILE *bounds;
 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                                         fprintf(stderr, "Sorry\n");
 205                                         exit(1);
 206                                 }
 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                         register char *cp = dp->d_name;
 292                         register 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         snprintf(fname, sizeof(fname), "%s/%s", getenv("HOME"), MSGSRC);
 408         msgsrc = fopen(fname, "r");
 409         if (msgsrc) {
 410                 newrc = NO;
 411                 fscanf(msgsrc, "%d\n", &nextmsg);
 412                 fclose(msgsrc);
 413                 if (nextmsg > lastmsg+1) {
 414                         printf("Warning: bounds have been reset (%d, %d)\n",
 415                                 firstmsg, lastmsg);
 416                         truncate(fname, (off_t)0);
 417                         newrc = YES;
 418                 }
 419                 else if (!rcfirst)
 420                         rcfirst = nextmsg - rcback;
 421         }
 422         else
 423                 newrc = YES;
 424         msgsrc = fopen(fname, "r+");
 425         if (msgsrc == NULL)
 426                 msgsrc = fopen(fname, "w");
 427         if (msgsrc == NULL)
 428                 err(errno, "%s", fname);
 429         if (rcfirst) {
 430                 if (rcfirst > lastmsg+1) {
 431                         printf("Warning: the last message is number %d.\n",
 432                                 lastmsg);
 433                         rcfirst = nextmsg;
 434                 }
 435                 if (rcfirst > firstmsg)
 436                         firstmsg = rcfirst;     /* don't set below first msg */
 437         }
 438         if (newrc) {
 439                 nextmsg = firstmsg;
 440                 fseek(msgsrc, 0L, 0);
 441                 fprintf(msgsrc, "%d\n", nextmsg);
 442                 fflush(msgsrc);
 443         }
 444
 445 #ifdef V7
 446         if (totty) {
 447                 struct winsize win;
 448                 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
 449                         Lpp = win.ws_row;
 450                 if (Lpp <= 0) {
 451                         if (tgetent(inbuf, getenv("TERM")) <= 0
 452                             || (Lpp = tgetnum("li")) <= 0) {
 453                                 Lpp = NLINES;
 454                         }
 455                 }
 456         }
 457 #endif
 458         Lpp -= 6;       /* for headers, etc. */
 459
 460         already = NO;
 461         prevmsg = firstmsg;
 462         printing = YES;
 463         if (ruptible)
 464                 signal(SIGINT, onintr);
 465
 466         /*
 467          * Main program loop
 468          */
 469         for (msg = firstmsg; msg <= lastmsg; msg++) {
 470
 471                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
 472                 newmsg = fopen(fname, "r");
 473                 if (newmsg == NULL)
 474                         continue;
 475
 476                 gfrsub(newmsg);         /* get From and Subject fields */
 477                 if (locomode && !local) {
 478                         fclose(newmsg);
 479                         continue;
 480                 }
 481
 482                 if (qopt) {     /* This has to be located here */
 483                         printf("There are new messages.\n");
 484                         exit(0);
 485                 }
 486
 487                 if (already && !hdrs)
 488                         putchar('\n');
 489
 490                 /*
 491                  * Print header
 492                  */
 493                 if (totty)
 494                         signal(SIGTSTP, onsusp);
 495                 (void) setjmp(tstpbuf);
 496                 already = YES;
 497                 nlines = 2;
 498                 if (seenfrom) {
 499                         printf("Message %d:\nFrom %s %s", msg, from, date);
 500                         nlines++;
 501                 }
 502                 if (seensubj) {
 503                         printf("Subject: %s", subj);
 504                         nlines++;
 505                 }
 506                 else {
 507                         if (seenfrom) {
 508                                 putchar('\n');
 509                                 nlines++;
 510                         }
 511                         while (nlines < 6
 512                             && fgets(inbuf, sizeof inbuf, newmsg)
 513                             && inbuf[0] != '\n') {
 514                                 fputs(inbuf, stdout);
 515                                 nlines++;
 516                         }
 517                 }
 518
 519                 lct = linecnt(newmsg);
 520                 if (lct)
 521                         printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
 522                             (lct == 1) ? "" : "s");
 523
 524                 if (hdrs) {
 525                         printf("\n-----\n");
 526                         fclose(newmsg);
 527                         continue;
 528                 }
 529
 530                 /*
 531                  * Ask user for command
 532                  */
 533                 if (totty)
 534                         ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
 535                 else
 536                         inbuf[0] = 'y';
 537                 if (totty)
 538                         signal(SIGTSTP, SIG_DFL);
 539 cmnd:
 540                 in = inbuf;
 541                 switch (*in) {
 542                         case 'x':
 543                         case 'X':
 544                                 exit(0);
 545
 546                         case 'q':
 547                         case 'Q':
 548                                 quitit = YES;
 549                                 printf("--Postponed--\n");
 550                                 exit(0);
 551                                 /* intentional fall-thru */
 552                         case 'n':
 553                         case 'N':
 554                                 if (msg >= nextmsg) sep = "Flushed";
 555                                 prevmsg = msg;
 556                                 break;
 557
 558                         case 'p':
 559                         case 'P':
 560                                 use_pager = (*in++ == 'p');
 561                                 /* intentional fallthru */
 562                         case '\n':
 563                         case 'y':
 564                         default:
 565                                 if (*in == '-') {
 566                                         msg = prevmsg-1;
 567                                         sep = "replay";
 568                                         break;
 569                                 }
 570                                 if (isdigit(*in)) {
 571                                         msg = next(in);
 572                                         sep = in;
 573                                         break;
 574                                 }
 575
 576                                 prmesg(nlines + lct + (seensubj? 1 : 0));
 577                                 prevmsg = msg;
 578
 579                 }
 580
 581                 printf("--%s--\n", sep);
 582                 sep = "-";
 583                 if (msg >= nextmsg) {
 584                         nextmsg = msg + 1;
 585                         fseek(msgsrc, 0L, 0);
 586                         fprintf(msgsrc, "%d\n", nextmsg);
 587                         fflush(msgsrc);
 588                 }
 589                 if (newmsg)
 590                         fclose(newmsg);
 591                 if (quitit)
 592                         break;
 593         }
 594
 595         /*
 596          * Make sure .rc file gets updated
 597          */
 598         if (--msg >= nextmsg) {
 599                 nextmsg = msg + 1;
 600                 fseek(msgsrc, 0L, 0);
 601                 fprintf(msgsrc, "%d\n", nextmsg);
 602                 fflush(msgsrc);
 603         }
 604         if (already && !quitit && lastcmd && totty) {
 605                 /*
 606                  * save or reply to last message?
 607                  */
 608                 msg = prevmsg;
 609                 ask(NOMORE);
 610                 if (inbuf[0] == '-' || isdigit(inbuf[0]))
 611                         goto cmnd;
 612         }
 613         if (!(already || hush || qopt))
 614                 printf("No new messages.\n");
 615         exit(0);
 616 }
 617
 618 static void
 619 usage()
 620 {
 621         fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
 622         exit(1);
 623 }
 624
 625 void
 626 prmesg(length)
 627 int length;
 628 {
 629         FILE *outf;
 630         char *env_pager;
 631
 632         if (use_pager && length > Lpp) {
 633                 signal(SIGPIPE, SIG_IGN);
 634                 signal(SIGQUIT, SIG_IGN);
 635                 if ((env_pager = getenv("PAGER")) == NULL) {
 636                         snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
 637                 } else {
 638                         snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
 639                 }
 640                 outf = popen(cmdbuf, "w");
 641                 if (!outf)
 642                         outf = stdout;
 643                 else
 644                         setbuf(outf, (char *)NULL);
 645         }
 646         else
 647                 outf = stdout;
 648
 649         if (seensubj)
 650                 putc('\n', outf);
 651
 652         while (fgets(inbuf, sizeof inbuf, newmsg)) {
 653                 fputs(inbuf, outf);
 654                 if (ferror(outf)) {
 655                         clearerr(outf);
 656                         break;
 657                 }
 658         }
 659
 660         if (outf != stdout) {
 661                 pclose(outf);
 662                 signal(SIGPIPE, SIG_DFL);
 663                 signal(SIGQUIT, SIG_DFL);
 664         }
 665         else {
 666                 fflush(stdout);
 667         }
 668
 669         /* force wait on output */
 670         tcdrain(fileno(stdout));
 671 }
 672
 673 void
 674 onintr(unused)
 675         int unused;
 676 {
 677         signal(SIGINT, onintr);
 678         if (mailing)
 679                 unlink(fname);
 680         if (sending) {
 681                 unlink(fname);
 682                 puts("--Killed--");
 683                 exit(1);
 684         }
 685         if (printing) {
 686                 putchar('\n');
 687                 if (hdrs)
 688                         exit(0);
 689                 sep = "Interrupt";
 690                 if (newmsg)
 691                         fseek(newmsg, 0L, 2);
 692                 intrpflg = YES;
 693         }
 694 }
 695
 696 /*
 697  * We have just gotten a susp.  Suspend and prepare to resume.
 698  */
 699 void
 700 onsusp(unused)
 701         int unused;
 702 {
 703         signal(SIGTSTP, SIG_DFL);
 704         sigsetmask(0);
 705         kill(0, SIGTSTP);
 706         signal(SIGTSTP, onsusp);
 707         if (!mailing)
 708                 longjmp(tstpbuf, 0);
 709 }
 710
 711 int
 712 linecnt(f)
 713 FILE *f;
 714 {
 715         off_t oldpos = ftell(f);
 716         int l = 0;
 717         char lbuf[BUFSIZ];
 718
 719         while (fgets(lbuf, sizeof lbuf, f))
 720                 l++;
 721         clearerr(f);
 722         fseek(f, oldpos, 0);
 723         return (l);
 724 }
 725
 726 int
 727 next(buf)
 728 char *buf;
 729 {
 730         int i;
 731         sscanf(buf, "%d", &i);
 732         sprintf(buf, "Goto %d", i);
 733         return(--i);
 734 }
 735
 736 void
 737 ask(prompt)
 738 char *prompt;
 739 {
 740         char    inch;
 741         int     n, cmsg, fd;
 742         off_t   oldpos;
 743         FILE    *cpfrom, *cpto;
 744
 745         printf("%s ", prompt);
 746         fflush(stdout);
 747         intrpflg = NO;
 748         (void) fgets(inbuf, sizeof inbuf, stdin);
 749         if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
 750                 inbuf[n - 1] = '\0';
 751         if (intrpflg)
 752                 inbuf[0] = 'x';
 753
 754         /*
 755          * Handle 'mail' and 'save' here.
 756          */
 757         if ((inch = inbuf[0]) == 's' || inch == 'm') {
 758                 if (inbuf[1] == '-')
 759                         cmsg = prevmsg;
 760                 else if (isdigit(inbuf[1]))
 761                         cmsg = atoi(&inbuf[1]);
 762                 else
 763                         cmsg = msg;
 764                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
 765
 766                 oldpos = ftell(newmsg);
 767
 768                 cpfrom = fopen(fname, "r");
 769                 if (!cpfrom) {
 770                         printf("Message %d not found\n", cmsg);
 771                         ask (prompt);
 772                         return;
 773                 }
 774
 775                 if (inch == 's') {
 776                         in = nxtfld(inbuf);
 777                         if (*in) {
 778                                 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
 779                                         fname[n] = in[n];
 780                                 }
 781                                 fname[n] = NULL;
 782                         }
 783                         else
 784                                 strcpy(fname, "Messages");
 785                         fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
 786                 }
 787                 else {
 788                         strcpy(fname, _PATH_TMP);
 789                         fd = mkstemp(fname);
 790                         if (fd != -1) {
 791                                 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
 792                                     fname);
 793                                 mailing = YES;
 794                         }
 795                 }
 796                 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
 797                         if (fd != -1)
 798                                 close(fd);
 799                         warn("%s", fname);
 800                         mailing = NO;
 801                         fseek(newmsg, oldpos, 0);
 802                         ask(prompt);
 803                         return;
 804                 }
 805
 806                 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
 807                         fwrite(inbuf, 1, n, cpto);
 808
 809                 fclose(cpfrom);
 810                 fclose(cpto);
 811                 fseek(newmsg, oldpos, 0);       /* reposition current message */
 812                 if (inch == 's')
 813                         printf("Message %d saved in \"%s\"\n", cmsg, fname);
 814                 else {
 815                         system(cmdbuf);
 816                         unlink(fname);
 817                         mailing = NO;
 818                 }
 819                 ask(prompt);
 820         }
 821 }
 822
 823 void
 824 gfrsub(infile)
 825 FILE *infile;
 826 {
 827         off_t frompos;
 828         int count;
 829
 830         seensubj = seenfrom = NO;
 831         local = YES;
 832         subj[0] = from[0] = date[0] = NULL;
 833
 834         /*
 835          * Is this a normal message?
 836          */
 837         if (fgets(inbuf, sizeof inbuf, infile)) {
 838                 if (strncmp(inbuf, "From", 4)==0) {
 839                         /*
 840                          * expected form starts with From
 841                          */
 842                         seenfrom = YES;
 843                         frompos = ftell(infile);
 844                         ptr = from;
 845                         in = nxtfld(inbuf);
 846                         if (*in) {
 847                                 count = sizeof(from) - 1;
 848                                 while (*in && *in > ' ' && count-- > 0) {
 849                                         if (*in == ':' || *in == '@' ||
 850                                             *in == '!')
 851                                                 local = NO;
 852                                         *ptr++ = *in++;
 853                                 }
 854                         }
 855                         *ptr = NULL;
 856                         if (*(in = nxtfld(in)))
 857                                 strncpy(date, in, sizeof date);
 858                         else {
 859                                 date[0] = '\n';
 860                                 date[1] = NULL;
 861                         }
 862                 }
 863                 else {
 864                         /*
 865                          * not the expected form
 866                          */
 867                         fseek(infile, 0L, 0);
 868                         return;
 869                 }
 870         }
 871         else
 872                 /*
 873                  * empty file ?
 874                  */
 875                 return;
 876
 877         /*
 878          * look for Subject line until EOF or a blank line
 879          */
 880         while (fgets(inbuf, sizeof inbuf, infile)
 881             && !(blankline = (inbuf[0] == '\n'))) {
 882                 /*
 883                  * extract Subject line
 884                  */
 885                 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
 886                         seensubj = YES;
 887                         frompos = ftell(infile);
 888                         strncpy(subj, nxtfld(inbuf), sizeof subj);
 889                 }
 890         }
 891         if (!blankline)
 892                 /*
 893                  * ran into EOF
 894                  */
 895                 fseek(infile, frompos, 0);
 896
 897         if (!seensubj)
 898                 /*
 899                  * for possible use with Mail
 900                  */
 901                 strncpy(subj, "(No Subject)\n", sizeof subj);
 902 }
 903
 904 char *
 905 nxtfld(s)
 906 unsigned char *s;
 907 {
 908         if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
 909         if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
 910         return (s);
 911 }