usr.bin/msgs/msgs.c

   1 /*-
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1980, 1993\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif /* not lint */
  35
  36 #if 0
  37 #ifndef lint
  38 static char sccsid[] = "@(#)msgs.c      8.2 (Berkeley) 4/28/95";
  39 #endif /* not lint */
  40 #endif
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 /*
  46  * msgs - a user bulletin board program
  47  *
  48  * usage:
  49  *      msgs [fhlopq] [[-]number]       to read messages
  50  *      msgs -s                         to place messages
  51  *      msgs -c [-days]                 to clean up the bulletin board
  52  *
  53  * prompt commands are:
  54  *      y       print message
  55  *      n       flush message, go to next message
  56  *      q       flush message, quit
  57  *      p       print message, turn on 'pipe thru more' mode
  58  *      P       print message, turn off 'pipe thru more' mode
  59  *      -       reprint last message
  60  *      s[-][<num>] [<filename>]        save message
  61  *      m[-][<num>]     mail with message in temp mbox
  62  *      x       exit without flushing this message
  63  *      <num>   print message number <num>
  64  */
  65
  66 #define V7              /* will look for TERM in the environment */
  67 #define OBJECT          /* will object to messages without Subjects */
  68 /* #define REJECT */    /* will reject messages without Subjects
  69                            (OBJECT must be defined also) */
  70 /* #define UNBUFFERED *//* use unbuffered output */
  71
  72 #include <sys/param.h>
  73 #include <sys/stat.h>
  74 #include <ctype.h>
  75 #include <dirent.h>
  76 #include <err.h>
  77 #include <errno.h>
  78 #include <fcntl.h>
  79 #include <locale.h>
  80 #include <pwd.h>
  81 #include <setjmp.h>
  82 #include <termcap.h>
  83 #include <termios.h>
  84 #include <signal.h>
  85 #include <stdio.h>
  86 #include <stdlib.h>
  87 #include <string.h>
  88 #include <time.h>
  89 #include <unistd.h>
  90 #include "pathnames.h"
  91
  92 #define CMODE   0644            /* bounds file creation mode */
  93 #define NO      0
  94 #define YES     1
  95 #define SUPERUSER       0       /* superuser uid */
  96 #define DAEMON          1       /* daemon uid */
  97 #define NLINES  24              /* default number of lines/crt screen */
  98 #define NDAYS   21              /* default keep time for messages */
  99 #define DAYS    *24*60*60       /* seconds/day */
 100 #define MSGSRC  ".msgsrc"       /* user's rc file */
 101 #define BOUNDS  "bounds"        /* message bounds file */
 102 #define NEXT    "Next message? [yq]"
 103 #define MORE    "More? [ynq]"
 104 #define NOMORE  "(No more) [q] ?"
 105
 106 typedef char    bool;
 107
 108 static FILE     *msgsrc;
 109 static FILE     *newmsg;
 110 static const char *sep = "-";
 111 static char     inbuf[BUFSIZ];
 112 static char     fname[MAXPATHLEN];
 113 static char     cmdbuf[MAXPATHLEN + MAXPATHLEN];
 114 static char     subj[128];
 115 static char     from[128];
 116 static char     date[128];
 117 static char     *ptr;
 118 static char     *in;
 119 static bool     local;
 120 static bool     ruptible;
 121 static bool     totty;
 122 static bool     seenfrom;
 123 static bool     seensubj;
 124 static bool     blankline;
 125 static bool     printing = NO;
 126 static bool     mailing = NO;
 127 static bool     quitit = NO;
 128 static bool     sending = NO;
 129 static bool     intrpflg = NO;
 130 static uid_t    uid;
 131 static int      msg;
 132 static int      prevmsg;
 133 static int      lct;
 134 static int      nlines;
 135 static int      Lpp = 0;
 136 static time_t   t;
 137 static time_t   keep;
 138
 139 /* option initialization */
 140 static bool     hdrs = NO;
 141 static bool     qopt = NO;
 142 static bool     hush = NO;
 143 static bool     send_msg = NO;
 144 static bool     locomode = NO;
 145 static bool     use_pager = NO;
 146 static bool     clean = NO;
 147 static bool     lastcmd = NO;
 148 static jmp_buf  tstpbuf;
 149
 150 static void     ask(const char *);
 151 static void     gfrsub(FILE *);
 152 static int      linecnt(FILE *);
 153 static int      next(char *);
 154 static char     *nxtfld(char *);
 155 static void     onsusp(int);
 156 static void     onintr(int);
 157 static void     prmesg(int);
 158 static void     usage(void);
 159
 160 int
 161 main(int argc, char *argv[])
 162 {
 163         bool newrc, already;
 164         int rcfirst = 0;                /* first message to print (from .rc) */
 165         int rcback = 0;                 /* amount to back off of rcfirst */
 166         int firstmsg = 0, nextmsg = 0, lastmsg = 0;
 167         int blast = 0;
 168         struct stat buf;                /* stat to check access of bounds */
 169         FILE *bounds;
 170         char *cp;
 171
 172 #ifdef UNBUFFERED
 173         setbuf(stdout, NULL);
 174 #endif
 175         setlocale(LC_ALL, "");
 176
 177         time(&t);
 178         if (setuid(uid = getuid()) != 0)
 179                 err(1, "setuid failed");
 180         ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
 181         if (ruptible)
 182                 signal(SIGINT, SIG_DFL);
 183
 184         argc--, argv++;
 185         while (argc > 0) {
 186                 if (isdigit(argv[0][0])) {      /* starting message # */
 187                         rcfirst = atoi(argv[0]);
 188                 }
 189                 else if (isdigit(argv[0][1])) { /* backward offset */
 190                         rcback = atoi( &( argv[0][1] ) );
 191                 }
 192                 else {
 193                         ptr = *argv;
 194                         while (*ptr) switch (*ptr++) {
 195
 196                         case '-':
 197                                 break;
 198
 199                         case 'c':
 200                                 if (uid != SUPERUSER && uid != DAEMON)
 201                                         errx(1,
 202                                 "only the super-user can use the c flag");
 203                                 clean = YES;
 204                                 break;
 205
 206                         case 'f':               /* silently */
 207                                 hush = YES;
 208                                 break;
 209
 210                         case 'h':               /* headers only */
 211                                 hdrs = YES;
 212                                 break;
 213
 214                         case 'l':               /* local msgs only */
 215                                 locomode = YES;
 216                                 break;
 217
 218                         case 'o':               /* option to save last message */
 219                                 lastcmd = YES;
 220                                 break;
 221
 222                         case 'p':               /* pipe thru 'more' during long msgs */
 223                                 use_pager = YES;
 224                                 break;
 225
 226                         case 'q':               /* query only */
 227                                 qopt = YES;
 228                                 break;
 229
 230                         case 's':               /* sending TO msgs */
 231                                 send_msg = YES;
 232                                 break;
 233
 234                         default:
 235                                 usage();
 236                         }
 237                 }
 238                 argc--, argv++;
 239         }
 240
 241         /*
 242          * determine current message bounds
 243          */
 244         snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS);
 245
 246         /*
 247          * Test access rights to the bounds file
 248          * This can be a little tricky.  if(send_msg), then
 249          * we will create it.  We assume that if(send_msg),
 250          * then you have write permission there.
 251          * Else, it better be there, or we bail.
 252          */
 253         if (send_msg != YES) {
 254                 if (stat(fname, &buf) < 0) {
 255                         if (hush != YES) {
 256                                 err(errno, "%s", fname);
 257                         } else {
 258                                 exit(1);
 259                         }
 260                 }
 261         }
 262         bounds = fopen(fname, "r");
 263
 264         if (bounds != NULL) {
 265                 fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg);
 266                 fclose(bounds);
 267                 blast = lastmsg;        /* save upper bound */
 268         }
 269
 270         if (clean)
 271                 keep = t - (rcback? rcback : NDAYS) DAYS;
 272
 273         if (clean || bounds == NULL) {  /* relocate message bounds */
 274                 struct dirent *dp;
 275                 struct stat stbuf;
 276                 bool seenany = NO;
 277                 DIR     *dirp;
 278
 279                 dirp = opendir(_PATH_MSGS);
 280                 if (dirp == NULL)
 281                         err(errno, "%s", _PATH_MSGS);
 282
 283                 firstmsg = 32767;
 284                 lastmsg = 0;
 285
 286                 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
 287                         cp = dp->d_name;
 288                         int i = 0;
 289
 290                         if (dp->d_ino == 0)
 291                                 continue;
 292                         if (dp->d_namlen == 0)
 293                                 continue;
 294
 295                         if (clean)
 296                                 snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp);
 297
 298                         while (isdigit(*cp))
 299                                 i = i * 10 + *cp++ - '0';
 300                         if (*cp)
 301                                 continue;       /* not a message! */
 302
 303                         if (clean) {
 304                                 if (stat(inbuf, &stbuf) != 0)
 305                                         continue;
 306                                 if (stbuf.st_mtime < keep
 307                                     && stbuf.st_mode&S_IWRITE) {
 308                                         unlink(inbuf);
 309                                         continue;
 310                                 }
 311                         }
 312
 313                         if (i > lastmsg)
 314                                 lastmsg = i;
 315                         if (i < firstmsg)
 316                                 firstmsg = i;
 317                         seenany = YES;
 318                 }
 319                 closedir(dirp);
 320
 321                 if (!seenany) {
 322                         if (blast != 0) /* never lower the upper bound! */
 323                                 lastmsg = blast;
 324                         firstmsg = lastmsg + 1;
 325                 }
 326                 else if (blast > lastmsg)
 327                         lastmsg = blast;
 328
 329                 if (!send_msg) {
 330                         bounds = fopen(fname, "w");
 331                         if (bounds == NULL)
 332                                 err(errno, "%s", fname);
 333                         chmod(fname, CMODE);
 334                         fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
 335                         fclose(bounds);
 336                 }
 337         }
 338
 339         if (send_msg) {
 340                 /*
 341                  * Send mode - place msgs in _PATH_MSGS
 342                  */
 343                 bounds = fopen(fname, "w");
 344                 if (bounds == NULL)
 345                         err(errno, "%s", fname);
 346
 347                 nextmsg = lastmsg + 1;
 348                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg);
 349                 newmsg = fopen(fname, "w");
 350                 if (newmsg == NULL)
 351                         err(errno, "%s", fname);
 352                 chmod(fname, CMODE);
 353
 354                 fprintf(bounds, "%d %d\n", firstmsg, nextmsg);
 355                 fclose(bounds);
 356
 357                 sending = YES;
 358                 if (ruptible)
 359                         signal(SIGINT, onintr);
 360
 361                 if (isatty(fileno(stdin))) {
 362                         ptr = getpwuid(uid)->pw_name;
 363                         printf("Message %d:\nFrom %s %sSubject: ",
 364                                 nextmsg, ptr, ctime(&t));
 365                         fflush(stdout);
 366                         fgets(inbuf, sizeof inbuf, stdin);
 367                         putchar('\n');
 368                         fflush(stdout);
 369                         fprintf(newmsg, "From %s %sSubject: %s\n",
 370                                 ptr, ctime(&t), inbuf);
 371                         blankline = seensubj = YES;
 372                 }
 373                 else
 374                         blankline = seensubj = NO;
 375                 for (;;) {
 376                         fgets(inbuf, sizeof inbuf, stdin);
 377                         if (feof(stdin) || ferror(stdin))
 378                                 break;
 379                         blankline = (blankline || (inbuf[0] == '\n'));
 380                         seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
 381                         fputs(inbuf, newmsg);
 382                 }
 383 #ifdef OBJECT
 384                 if (!seensubj) {
 385                         printf("NOTICE: Messages should have a Subject field!\n");
 386 #ifdef REJECT
 387                         unlink(fname);
 388 #endif
 389                         exit(1);
 390                 }
 391 #endif
 392                 exit(ferror(stdin));
 393         }
 394         if (clean)
 395                 exit(0);
 396
 397         /*
 398          * prepare to display messages
 399          */
 400         totty = (isatty(fileno(stdout)) != 0);
 401         use_pager = use_pager && totty;
 402
 403         if ((cp = getenv("HOME")) == NULL || *cp == '\0') {
 404                 fprintf(stderr, "Error, no home directory!\n");
 405                 exit(1);
 406         }
 407         snprintf(fname, sizeof(fname), "%s/%s", cp, 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                 rewind(msgsrc);
 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                                 /* FALLTHROUGH */
 544                         case 'X':
 545                                 exit(0);
 546                                 /* NOTREACHED */
 547
 548                         case 'q':
 549                                 /* FALLTHROUGH */
 550                         case 'Q':
 551                                 quitit = YES;
 552                                 printf("--Postponed--\n");
 553                                 exit(0);
 554                                 /* NOTREACHED */
 555
 556                         case 'n':
 557                                 /* FALLTHROUGH */
 558                         case 'N':
 559                                 if (msg >= nextmsg) sep = "Flushed";
 560                                 prevmsg = msg;
 561                                 break;
 562
 563                         case 'p':
 564                                 /* FALLTHROUGH */
 565                         case 'P':
 566                                 use_pager = (*in++ == 'p');
 567                                 /* FALLTHROUGH */
 568                         case '\n':
 569                                 /* FALLTHROUGH */
 570                         case 'y':
 571                         default:
 572                                 if (*in == '-') {
 573                                         msg = prevmsg-1;
 574                                         sep = "replay";
 575                                         break;
 576                                 }
 577                                 if (isdigit(*in)) {
 578                                         msg = next(in);
 579                                         sep = in;
 580                                         break;
 581                                 }
 582
 583                                 prmesg(nlines + lct + (seensubj? 1 : 0));
 584                                 prevmsg = msg;
 585
 586                 }
 587
 588                 printf("--%s--\n", sep);
 589                 sep = "-";
 590                 if (msg >= nextmsg) {
 591                         nextmsg = msg + 1;
 592                         rewind(msgsrc);
 593                         fprintf(msgsrc, "%d\n", nextmsg);
 594                         fflush(msgsrc);
 595                 }
 596                 if (newmsg)
 597                         fclose(newmsg);
 598                 if (quitit)
 599                         break;
 600         }
 601
 602         /*
 603          * Make sure .rc file gets updated
 604          */
 605         if (--msg >= nextmsg) {
 606                 nextmsg = msg + 1;
 607                 rewind(msgsrc);
 608                 fprintf(msgsrc, "%d\n", nextmsg);
 609                 fflush(msgsrc);
 610         }
 611         if (already && !quitit && lastcmd && totty) {
 612                 /*
 613                  * save or reply to last message?
 614                  */
 615                 msg = prevmsg;
 616                 ask(NOMORE);
 617                 if (inbuf[0] == '-' || isdigit(inbuf[0]))
 618                         goto cmnd;
 619         }
 620         if (!(already || hush || qopt))
 621                 printf("No new messages.\n");
 622         exit(0);
 623         /* NOTREACHED */
 624 }
 625
 626 static void
 627 usage(void)
 628 {
 629         fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
 630         exit(1);
 631 }
 632
 633 static void
 634 prmesg(int length)
 635 {
 636         FILE *outf;
 637         char *env_pager;
 638
 639         if (use_pager && length > Lpp) {
 640                 signal(SIGPIPE, SIG_IGN);
 641                 signal(SIGQUIT, SIG_IGN);
 642                 if ((env_pager = getenv("PAGER")) == NULL) {
 643                         snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
 644                 } else {
 645                         snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
 646                 }
 647                 outf = popen(cmdbuf, "w");
 648                 if (!outf)
 649                         outf = stdout;
 650                 else
 651                         setbuf(outf, (char *)NULL);
 652         }
 653         else
 654                 outf = stdout;
 655
 656         if (seensubj)
 657                 putc('\n', outf);
 658
 659         while (fgets(inbuf, sizeof inbuf, newmsg)) {
 660                 fputs(inbuf, outf);
 661                 if (ferror(outf)) {
 662                         clearerr(outf);
 663                         break;
 664                 }
 665         }
 666
 667         if (outf != stdout) {
 668                 pclose(outf);
 669                 signal(SIGPIPE, SIG_DFL);
 670                 signal(SIGQUIT, SIG_DFL);
 671         }
 672         else {
 673                 fflush(stdout);
 674         }
 675
 676         /* force wait on output */
 677         tcdrain(fileno(stdout));
 678 }
 679
 680 static void
 681 onintr(int unused __unused)
 682 {
 683         signal(SIGINT, onintr);
 684         if (mailing)
 685                 unlink(fname);
 686         if (sending) {
 687                 unlink(fname);
 688                 puts("--Killed--");
 689                 exit(1);
 690         }
 691         if (printing) {
 692                 putchar('\n');
 693                 if (hdrs)
 694                         exit(0);
 695                 sep = "Interrupt";
 696                 if (newmsg)
 697                         fseeko(newmsg, (off_t)0, SEEK_END);
 698                 intrpflg = YES;
 699         }
 700 }
 701
 702 /*
 703  * We have just gotten a susp.  Suspend and prepare to resume.
 704  */
 705 static void
 706 onsusp(int unused __unused)
 707 {
 708         signal(SIGTSTP, SIG_DFL);
 709         sigsetmask(0);
 710         kill(0, SIGTSTP);
 711         signal(SIGTSTP, onsusp);
 712         if (!mailing)
 713                 longjmp(tstpbuf, 0);
 714 }
 715
 716 static int
 717 linecnt(FILE *f)
 718 {
 719         off_t oldpos = ftello(f);
 720         int l = 0;
 721         char lbuf[BUFSIZ];
 722
 723         while (fgets(lbuf, sizeof lbuf, f))
 724                 l++;
 725         clearerr(f);
 726         fseeko(f, oldpos, SEEK_SET);
 727         return (l);
 728 }
 729
 730 static int
 731 next(char *buf)
 732 {
 733         int i;
 734         sscanf(buf, "%d", &i);
 735         sprintf(buf, "Goto %d", i);
 736         return(--i);
 737 }
 738
 739 static void
 740 ask(const char *prompt)
 741 {
 742         char    inch;
 743         int     n, cmsg, fd;
 744         off_t   oldpos;
 745         FILE    *cpfrom, *cpto;
 746
 747         printf("%s ", prompt);
 748         fflush(stdout);
 749         intrpflg = NO;
 750         (void) fgets(inbuf, sizeof inbuf, stdin);
 751         if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
 752                 inbuf[n - 1] = '\0';
 753         if (intrpflg)
 754                 inbuf[0] = 'x';
 755
 756         /*
 757          * Handle 'mail' and 'save' here.
 758          */
 759         if ((inch = inbuf[0]) == 's' || inch == 'm') {
 760                 if (inbuf[1] == '-')
 761                         cmsg = prevmsg;
 762                 else if (isdigit(inbuf[1]))
 763                         cmsg = atoi(&inbuf[1]);
 764                 else
 765                         cmsg = msg;
 766                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
 767
 768                 oldpos = ftello(newmsg);
 769
 770                 cpfrom = fopen(fname, "r");
 771                 if (!cpfrom) {
 772                         printf("Message %d not found\n", cmsg);
 773                         ask (prompt);
 774                         return;
 775                 }
 776
 777                 if (inch == 's') {
 778                         in = nxtfld(inbuf);
 779                         if (*in) {
 780                                 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
 781                                         fname[n] = in[n];
 782                                 }
 783                                 fname[n] = '\0';
 784                         }
 785                         else
 786                                 strcpy(fname, "Messages");
 787                         fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
 788                 }
 789                 else {
 790                         strcpy(fname, _PATH_TMP);
 791                         fd = mkstemp(fname);
 792                         if (fd != -1) {
 793                                 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
 794                                     fname);
 795                                 mailing = YES;
 796                         }
 797                 }
 798                 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
 799                         if (fd != -1)
 800                                 close(fd);
 801                         warn("%s", fname);
 802                         mailing = NO;
 803                         fseeko(newmsg, oldpos, SEEK_SET);
 804                         ask(prompt);
 805                         return;
 806                 }
 807
 808                 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
 809                         fwrite(inbuf, 1, n, cpto);
 810
 811                 fclose(cpfrom);
 812                 fclose(cpto);
 813                 fseeko(newmsg, oldpos, SEEK_SET);/* reposition current message */
 814                 if (inch == 's')
 815                         printf("Message %d saved in \"%s\"\n", cmsg, fname);
 816                 else {
 817                         system(cmdbuf);
 818                         unlink(fname);
 819                         mailing = NO;
 820                 }
 821                 ask(prompt);
 822         }
 823 }
 824
 825 static void
 826 gfrsub(FILE *infile)
 827 {
 828         off_t frompos;
 829         int count;
 830
 831         seensubj = seenfrom = NO;
 832         local = YES;
 833         subj[0] = from[0] = date[0] = '\0';
 834
 835         /*
 836          * Is this a normal message?
 837          */
 838         if (fgets(inbuf, sizeof inbuf, infile)) {
 839                 if (strncmp(inbuf, "From", 4)==0) {
 840                         /*
 841                          * expected form starts with From
 842                          */
 843                         seenfrom = YES;
 844                         frompos = ftello(infile);
 845                         ptr = from;
 846                         in = nxtfld(inbuf);
 847                         if (*in) {
 848                                 count = sizeof(from) - 1;
 849                                 while (*in && *in > ' ' && count-- > 0) {
 850                                         if (*in == ':' || *in == '@' ||
 851                                             *in == '!')
 852                                                 local = NO;
 853                                         *ptr++ = *in++;
 854                                 }
 855                         }
 856                         *ptr = '\0';
 857                         if (*(in = nxtfld(in)))
 858                                 strncpy(date, in, sizeof date);
 859                         else {
 860                                 date[0] = '\n';
 861                                 date[1] = '\0';
 862                         }
 863                 }
 864                 else {
 865                         /*
 866                          * not the expected form
 867                          */
 868                         rewind(infile);
 869                         return;
 870                 }
 871         }
 872         else
 873                 /*
 874                  * empty file ?
 875                  */
 876                 return;
 877
 878         /*
 879          * look for Subject line until EOF or a blank line
 880          */
 881         while (fgets(inbuf, sizeof inbuf, infile)
 882             && !(blankline = (inbuf[0] == '\n'))) {
 883                 /*
 884                  * extract Subject line
 885                  */
 886                 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
 887                         seensubj = YES;
 888                         frompos = ftello(infile);
 889                         strncpy(subj, nxtfld(inbuf), sizeof subj);
 890                 }
 891         }
 892         if (!blankline)
 893                 /*
 894                  * ran into EOF
 895                  */
 896                 fseeko(infile, frompos, SEEK_SET);
 897
 898         if (!seensubj)
 899                 /*
 900                  * for possible use with Mail
 901                  */
 902                 strncpy(subj, "(No Subject)\n", sizeof subj);
 903 }
 904
 905 static char *
 906 nxtfld(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 }