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  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)msgs.c   8.2 (Berkeley) 4/28/95
  35  * $FreeBSD: src/usr.bin/msgs/msgs.c,v 1.15.2.2 2003/02/11 21:31:56 mike Exp $
  36  * $DragonFly: src/usr.bin/msgs/msgs.c,v 1.7 2007/11/25 18:10:07 swildner Exp $
  37  */
  38
  39 /*
  40  * msgs - a user bulletin board program
  41  *
  42  * usage:
  43  *      msgs [fhlopq] [[-]number]       to read messages
  44  *      msgs -s                         to place messages
  45  *      msgs -c [-days]                 to clean up the bulletin board
  46  *
  47  * prompt commands are:
  48  *      y       print message
  49  *      n       flush message, go to next message
  50  *      q       flush message, quit
  51  *      p       print message, turn on 'pipe thru more' mode
  52  *      P       print message, turn off 'pipe thru more' mode
  53  *      -       reprint last message
  54  *      s[-][<num>] [<filename>]        save message
  55  *      m[-][<num>]     mail with message in temp mbox
  56  *      x       exit without flushing this message
  57  *      <num>   print message number <num>
  58  */
  59
  60 #define V7              /* will look for TERM in the environment */
  61 #define OBJECT          /* will object to messages without Subjects */
  62 /* #define REJECT */    /* will reject messages without Subjects
  63                            (OBJECT must be defined also) */
  64 /* #define UNBUFFERED *//* use unbuffered output */
  65
  66 #include <sys/param.h>
  67 #include <sys/stat.h>
  68 #include <ctype.h>
  69 #include <dirent.h>
  70 #include <err.h>
  71 #include <errno.h>
  72 #include <fcntl.h>
  73 #include <locale.h>
  74 #include <pwd.h>
  75 #include <setjmp.h>
  76 #include <termcap.h>
  77 #include <termios.h>
  78 #include <signal.h>
  79 #include <stdio.h>
  80 #include <stdlib.h>
  81 #include <string.h>
  82 #include <time.h>
  83 #include <unistd.h>
  84 #include "pathnames.h"
  85
  86 #define CMODE   0644            /* bounds file creation mode */
  87 #define NO      0
  88 #define YES     1
  89 #define SUPERUSER       0       /* superuser uid */
  90 #define DAEMON          1       /* daemon uid */
  91 #define NLINES  24              /* default number of lines/crt screen */
  92 #define NDAYS   21              /* default keep time for messages */
  93 #define DAYS    *24*60*60       /* seconds/day */
  94 #define MSGSRC  ".msgsrc"       /* user's rc file */
  95 #define BOUNDS  "bounds"        /* message bounds file */
  96 #define NEXT    "Next message? [yq]"
  97 #define MORE    "More? [ynq]"
  98 #define NOMORE  "(No more) [q] ?"
  99
 100 typedef char    bool;
 101
 102 FILE    *msgsrc;
 103 FILE    *newmsg;
 104 const char *sep = "-";
 105 char    inbuf[BUFSIZ];
 106 char    fname[MAXPATHLEN];
 107 char    cmdbuf[MAXPATHLEN + MAXPATHLEN];
 108 char    subj[128];
 109 char    from[128];
 110 char    date[128];
 111 char    *ptr;
 112 char    *in;
 113 bool    local;
 114 bool    ruptible;
 115 bool    totty;
 116 bool    seenfrom;
 117 bool    seensubj;
 118 bool    blankline;
 119 bool    printing = NO;
 120 bool    mailing = NO;
 121 bool    quitit = NO;
 122 bool    sending = NO;
 123 bool    intrpflg = NO;
 124 int     uid;
 125 int     msg;
 126 int     prevmsg;
 127 int     lct;
 128 int     nlines;
 129 int     Lpp = 0;
 130 time_t  t;
 131 time_t  keep;
 132
 133 /* option initialization */
 134 bool    hdrs = NO;
 135 bool    qopt = NO;
 136 bool    hush = NO;
 137 bool    send_msg = NO;
 138 bool    locomode = NO;
 139 bool    use_pager = NO;
 140 bool    clean = NO;
 141 bool    lastcmd = NO;
 142 jmp_buf tstpbuf;
 143
 144
 145 void ask(const char *);
 146 void gfrsub(FILE *);
 147 int linecnt(FILE *);
 148 int next(char *);
 149 char *nxtfld(unsigned char *);
 150 void onsusp(int);
 151 void onintr(int);
 152 void prmesg(int);
 153 static void usage(void);
 154
 155 int
 156 main(int argc, char **argv)
 157 {
 158         bool newrc, already;
 159         int rcfirst = 0;                /* first message to print (from .rc) */
 160         int rcback = 0;                 /* amount to back off of rcfirst */
 161         int firstmsg = 0, nextmsg = 0, lastmsg = 0;
 162         int blast = 0;
 163         struct stat buf;                /* stat to check access of bounds */
 164         FILE *bounds;
 165
 166 #ifdef UNBUFFERED
 167         setbuf(stdout, NULL);
 168 #endif
 169         setlocale(LC_ALL, "");
 170
 171         time(&t);
 172         setuid(uid = getuid());
 173         ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
 174         if (ruptible)
 175                 signal(SIGINT, SIG_DFL);
 176
 177         argc--, argv++;
 178         while (argc > 0) {
 179                 if (isdigit(argv[0][0])) {      /* starting message # */
 180                         rcfirst = atoi(argv[0]);
 181                 }
 182                 else if (isdigit(argv[0][1])) { /* backward offset */
 183                         rcback = atoi( &( argv[0][1] ) );
 184                 }
 185                 else {
 186                         ptr = *argv;
 187                         while (*ptr) switch (*ptr++) {
 188
 189                         case '-':
 190                                 break;
 191
 192                         case 'c':
 193                                 if (uid != SUPERUSER && uid != DAEMON) {
 194                                         fprintf(stderr, "Sorry\n");
 195                                         exit(1);
 196                                 }
 197                                 clean = YES;
 198                                 break;
 199
 200                         case 'f':               /* silently */
 201                                 hush = YES;
 202                                 break;
 203
 204                         case 'h':               /* headers only */
 205                                 hdrs = YES;
 206                                 break;
 207
 208                         case 'l':               /* local msgs only */
 209                                 locomode = YES;
 210                                 break;
 211
 212                         case 'o':               /* option to save last message */
 213                                 lastcmd = YES;
 214                                 break;
 215
 216                         case 'p':               /* pipe thru 'more' during long msgs */
 217                                 use_pager = YES;
 218                                 break;
 219
 220                         case 'q':               /* query only */
 221                                 qopt = YES;
 222                                 break;
 223
 224                         case 's':               /* sending TO msgs */
 225                                 send_msg = YES;
 226                                 break;
 227
 228                         default:
 229                                 usage();
 230                         }
 231                 }
 232                 argc--, argv++;
 233         }
 234
 235         /*
 236          * determine current message bounds
 237          */
 238         snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS);
 239
 240         /*
 241          * Test access rights to the bounds file
 242          * This can be a little tricky.  if(send_msg), then
 243          * we will create it.  We assume that if(send_msg),
 244          * then you have write permission there.
 245          * Else, it better be there, or we bail.
 246          */
 247         if (send_msg != YES) {
 248                 if (stat(fname, &buf) < 0) {
 249                         if (hush != YES) {
 250                                 err(errno, "%s", fname);
 251                         } else {
 252                                 exit(1);
 253                         }
 254                 }
 255         }
 256         bounds = fopen(fname, "r");
 257
 258         if (bounds != NULL) {
 259                 fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg);
 260                 fclose(bounds);
 261                 blast = lastmsg;        /* save upper bound */
 262         }
 263
 264         if (clean)
 265                 keep = t - (rcback? rcback : NDAYS) DAYS;
 266
 267         if (clean || bounds == NULL) {  /* relocate message bounds */
 268                 struct dirent *dp;
 269                 struct stat stbuf;
 270                 bool seenany = NO;
 271                 DIR     *dirp;
 272
 273                 dirp = opendir(_PATH_MSGS);
 274                 if (dirp == NULL)
 275                         err(errno, "%s", _PATH_MSGS);
 276
 277                 firstmsg = 32767;
 278                 lastmsg = 0;
 279
 280                 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
 281                         char *cp = dp->d_name;
 282                         int i = 0;
 283
 284                         if (dp->d_ino == 0)
 285                                 continue;
 286
 287                         if (clean)
 288                                 snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp);
 289
 290                         while (isdigit(*cp))
 291                                 i = i * 10 + *cp++ - '0';
 292                         if (*cp)
 293                                 continue;       /* not a message! */
 294
 295                         if (clean) {
 296                                 if (stat(inbuf, &stbuf) != 0)
 297                                         continue;
 298                                 if (stbuf.st_mtime < keep
 299                                     && stbuf.st_mode&S_IWRITE) {
 300                                         unlink(inbuf);
 301                                         continue;
 302                                 }
 303                         }
 304
 305                         if (i > lastmsg)
 306                                 lastmsg = i;
 307                         if (i < firstmsg)
 308                                 firstmsg = i;
 309                         seenany = YES;
 310                 }
 311                 closedir(dirp);
 312
 313                 if (!seenany) {
 314                         if (blast != 0) /* never lower the upper bound! */
 315                                 lastmsg = blast;
 316                         firstmsg = lastmsg + 1;
 317                 }
 318                 else if (blast > lastmsg)
 319                         lastmsg = blast;
 320
 321                 if (!send_msg) {
 322                         bounds = fopen(fname, "w");
 323                         if (bounds == NULL)
 324                                 err(errno, "%s", fname);
 325                         chmod(fname, CMODE);
 326                         fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
 327                         fclose(bounds);
 328                 }
 329         }
 330
 331         if (send_msg) {
 332                 /*
 333                  * Send mode - place msgs in _PATH_MSGS
 334                  */
 335                 bounds = fopen(fname, "w");
 336                 if (bounds == NULL)
 337                         err(errno, "%s", fname);
 338
 339                 nextmsg = lastmsg + 1;
 340                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg);
 341                 newmsg = fopen(fname, "w");
 342                 if (newmsg == NULL)
 343                         err(errno, "%s", fname);
 344                 chmod(fname, CMODE);
 345
 346                 fprintf(bounds, "%d %d\n", firstmsg, nextmsg);
 347                 fclose(bounds);
 348
 349                 sending = YES;
 350                 if (ruptible)
 351                         signal(SIGINT, onintr);
 352
 353                 if (isatty(fileno(stdin))) {
 354                         ptr = getpwuid(uid)->pw_name;
 355                         printf("Message %d:\nFrom %s %sSubject: ",
 356                                 nextmsg, ptr, ctime(&t));
 357                         fflush(stdout);
 358                         fgets(inbuf, sizeof inbuf, stdin);
 359                         putchar('\n');
 360                         fflush(stdout);
 361                         fprintf(newmsg, "From %s %sSubject: %s\n",
 362                                 ptr, ctime(&t), inbuf);
 363                         blankline = seensubj = YES;
 364                 }
 365                 else
 366                         blankline = seensubj = NO;
 367                 for (;;) {
 368                         fgets(inbuf, sizeof inbuf, stdin);
 369                         if (feof(stdin) || ferror(stdin))
 370                                 break;
 371                         blankline = (blankline || (inbuf[0] == '\n'));
 372                         seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
 373                         fputs(inbuf, newmsg);
 374                 }
 375 #ifdef OBJECT
 376                 if (!seensubj) {
 377                         printf("NOTICE: Messages should have a Subject field!\n");
 378 #ifdef REJECT
 379                         unlink(fname);
 380 #endif
 381                         exit(1);
 382                 }
 383 #endif
 384                 exit(ferror(stdin));
 385         }
 386         if (clean)
 387                 exit(0);
 388
 389         /*
 390          * prepare to display messages
 391          */
 392         totty = (isatty(fileno(stdout)) != 0);
 393         use_pager = use_pager && totty;
 394
 395         snprintf(fname, sizeof(fname), "%s/%s", getenv("HOME"), MSGSRC);
 396         msgsrc = fopen(fname, "r");
 397         if (msgsrc) {
 398                 newrc = NO;
 399                 fscanf(msgsrc, "%d\n", &nextmsg);
 400                 fclose(msgsrc);
 401                 if (nextmsg > lastmsg+1) {
 402                         printf("Warning: bounds have been reset (%d, %d)\n",
 403                                 firstmsg, lastmsg);
 404                         truncate(fname, (off_t)0);
 405                         newrc = YES;
 406                 }
 407                 else if (!rcfirst)
 408                         rcfirst = nextmsg - rcback;
 409         }
 410         else
 411                 newrc = YES;
 412         msgsrc = fopen(fname, "r+");
 413         if (msgsrc == NULL)
 414                 msgsrc = fopen(fname, "w");
 415         if (msgsrc == NULL)
 416                 err(errno, "%s", fname);
 417         if (rcfirst) {
 418                 if (rcfirst > lastmsg+1) {
 419                         printf("Warning: the last message is number %d.\n",
 420                                 lastmsg);
 421                         rcfirst = nextmsg;
 422                 }
 423                 if (rcfirst > firstmsg)
 424                         firstmsg = rcfirst;     /* don't set below first msg */
 425         }
 426         if (newrc) {
 427                 nextmsg = firstmsg;
 428                 fseek(msgsrc, 0L, 0);
 429                 fprintf(msgsrc, "%d\n", nextmsg);
 430                 fflush(msgsrc);
 431         }
 432
 433 #ifdef V7
 434         if (totty) {
 435                 struct winsize win;
 436                 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
 437                         Lpp = win.ws_row;
 438                 if (Lpp <= 0) {
 439                         if (tgetent(inbuf, getenv("TERM")) <= 0
 440                             || (Lpp = tgetnum("li")) <= 0) {
 441                                 Lpp = NLINES;
 442                         }
 443                 }
 444         }
 445 #endif
 446         Lpp -= 6;       /* for headers, etc. */
 447
 448         already = NO;
 449         prevmsg = firstmsg;
 450         printing = YES;
 451         if (ruptible)
 452                 signal(SIGINT, onintr);
 453
 454         /*
 455          * Main program loop
 456          */
 457         for (msg = firstmsg; msg <= lastmsg; msg++) {
 458
 459                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
 460                 newmsg = fopen(fname, "r");
 461                 if (newmsg == NULL)
 462                         continue;
 463
 464                 gfrsub(newmsg);         /* get From and Subject fields */
 465                 if (locomode && !local) {
 466                         fclose(newmsg);
 467                         continue;
 468                 }
 469
 470                 if (qopt) {     /* This has to be located here */
 471                         printf("There are new messages.\n");
 472                         exit(0);
 473                 }
 474
 475                 if (already && !hdrs)
 476                         putchar('\n');
 477
 478                 /*
 479                  * Print header
 480                  */
 481                 if (totty)
 482                         signal(SIGTSTP, onsusp);
 483                 (void) setjmp(tstpbuf);
 484                 already = YES;
 485                 nlines = 2;
 486                 if (seenfrom) {
 487                         printf("Message %d:\nFrom %s %s", msg, from, date);
 488                         nlines++;
 489                 }
 490                 if (seensubj) {
 491                         printf("Subject: %s", subj);
 492                         nlines++;
 493                 }
 494                 else {
 495                         if (seenfrom) {
 496                                 putchar('\n');
 497                                 nlines++;
 498                         }
 499                         while (nlines < 6
 500                             && fgets(inbuf, sizeof inbuf, newmsg)
 501                             && inbuf[0] != '\n') {
 502                                 fputs(inbuf, stdout);
 503                                 nlines++;
 504                         }
 505                 }
 506
 507                 lct = linecnt(newmsg);
 508                 if (lct)
 509                         printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
 510                             (lct == 1) ? "" : "s");
 511
 512                 if (hdrs) {
 513                         printf("\n-----\n");
 514                         fclose(newmsg);
 515                         continue;
 516                 }
 517
 518                 /*
 519                  * Ask user for command
 520                  */
 521                 if (totty)
 522                         ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
 523                 else
 524                         inbuf[0] = 'y';
 525                 if (totty)
 526                         signal(SIGTSTP, SIG_DFL);
 527 cmnd:
 528                 in = inbuf;
 529                 switch (*in) {
 530                         case 'x':
 531                         case 'X':
 532                                 exit(0);
 533
 534                         case 'q':
 535                         case 'Q':
 536                                 quitit = YES;
 537                                 printf("--Postponed--\n");
 538                                 exit(0);
 539                                 /* intentional fall-thru */
 540                         case 'n':
 541                         case 'N':
 542                                 if (msg >= nextmsg) sep = "Flushed";
 543                                 prevmsg = msg;
 544                                 break;
 545
 546                         case 'p':
 547                         case 'P':
 548                                 use_pager = (*in++ == 'p');
 549                                 /* intentional fallthru */
 550                         case '\n':
 551                         case 'y':
 552                         default:
 553                                 if (*in == '-') {
 554                                         msg = prevmsg-1;
 555                                         sep = "replay";
 556                                         break;
 557                                 }
 558                                 if (isdigit(*in)) {
 559                                         msg = next(in);
 560                                         sep = in;
 561                                         break;
 562                                 }
 563
 564                                 prmesg(nlines + lct + (seensubj? 1 : 0));
 565                                 prevmsg = msg;
 566
 567                 }
 568
 569                 printf("--%s--\n", sep);
 570                 sep = "-";
 571                 if (msg >= nextmsg) {
 572                         nextmsg = msg + 1;
 573                         fseek(msgsrc, 0L, 0);
 574                         fprintf(msgsrc, "%d\n", nextmsg);
 575                         fflush(msgsrc);
 576                 }
 577                 if (newmsg)
 578                         fclose(newmsg);
 579                 if (quitit)
 580                         break;
 581         }
 582
 583         /*
 584          * Make sure .rc file gets updated
 585          */
 586         if (--msg >= nextmsg) {
 587                 nextmsg = msg + 1;
 588                 fseek(msgsrc, 0L, 0);
 589                 fprintf(msgsrc, "%d\n", nextmsg);
 590                 fflush(msgsrc);
 591         }
 592         if (already && !quitit && lastcmd && totty) {
 593                 /*
 594                  * save or reply to last message?
 595                  */
 596                 msg = prevmsg;
 597                 ask(NOMORE);
 598                 if (inbuf[0] == '-' || isdigit(inbuf[0]))
 599                         goto cmnd;
 600         }
 601         if (!(already || hush || qopt))
 602                 printf("No new messages.\n");
 603         exit(0);
 604 }
 605
 606 static void
 607 usage(void)
 608 {
 609         fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
 610         exit(1);
 611 }
 612
 613 void
 614 prmesg(int length)
 615 {
 616         FILE *outf;
 617         char *env_pager;
 618
 619         if (use_pager && length > Lpp) {
 620                 signal(SIGPIPE, SIG_IGN);
 621                 signal(SIGQUIT, SIG_IGN);
 622                 if ((env_pager = getenv("PAGER")) == NULL) {
 623                         snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
 624                 } else {
 625                         snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
 626                 }
 627                 outf = popen(cmdbuf, "w");
 628                 if (!outf)
 629                         outf = stdout;
 630                 else
 631                         setbuf(outf, (char *)NULL);
 632         }
 633         else
 634                 outf = stdout;
 635
 636         if (seensubj)
 637                 putc('\n', outf);
 638
 639         while (fgets(inbuf, sizeof inbuf, newmsg)) {
 640                 fputs(inbuf, outf);
 641                 if (ferror(outf)) {
 642                         clearerr(outf);
 643                         break;
 644                 }
 645         }
 646
 647         if (outf != stdout) {
 648                 pclose(outf);
 649                 signal(SIGPIPE, SIG_DFL);
 650                 signal(SIGQUIT, SIG_DFL);
 651         }
 652         else {
 653                 fflush(stdout);
 654         }
 655
 656         /* force wait on output */
 657         tcdrain(fileno(stdout));
 658 }
 659
 660 void
 661 onintr(int unused __unused)
 662 {
 663         signal(SIGINT, onintr);
 664         if (mailing)
 665                 unlink(fname);
 666         if (sending) {
 667                 unlink(fname);
 668                 puts("--Killed--");
 669                 exit(1);
 670         }
 671         if (printing) {
 672                 putchar('\n');
 673                 if (hdrs)
 674                         exit(0);
 675                 sep = "Interrupt";
 676                 if (newmsg)
 677                         fseek(newmsg, 0L, 2);
 678                 intrpflg = YES;
 679         }
 680 }
 681
 682 /*
 683  * We have just gotten a susp.  Suspend and prepare to resume.
 684  */
 685 void
 686 onsusp(int unused __unused)
 687 {
 688         signal(SIGTSTP, SIG_DFL);
 689         sigsetmask(0);
 690         kill(0, SIGTSTP);
 691         signal(SIGTSTP, onsusp);
 692         if (!mailing)
 693                 longjmp(tstpbuf, 0);
 694 }
 695
 696 int
 697 linecnt(FILE *f)
 698 {
 699         off_t oldpos = ftell(f);
 700         int l = 0;
 701         char lbuf[BUFSIZ];
 702
 703         while (fgets(lbuf, sizeof lbuf, f))
 704                 l++;
 705         clearerr(f);
 706         fseek(f, oldpos, 0);
 707         return (l);
 708 }
 709
 710 int
 711 next(char *buf)
 712 {
 713         int i;
 714         sscanf(buf, "%d", &i);
 715         sprintf(buf, "Goto %d", i);
 716         return(--i);
 717 }
 718
 719 void
 720 ask(const char *prompt)
 721 {
 722         char    inch;
 723         int     n, cmsg, fd;
 724         off_t   oldpos;
 725         FILE    *cpfrom, *cpto;
 726
 727         printf("%s ", prompt);
 728         fflush(stdout);
 729         intrpflg = NO;
 730         (void) fgets(inbuf, sizeof inbuf, stdin);
 731         if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
 732                 inbuf[n - 1] = '\0';
 733         if (intrpflg)
 734                 inbuf[0] = 'x';
 735
 736         /*
 737          * Handle 'mail' and 'save' here.
 738          */
 739         if ((inch = inbuf[0]) == 's' || inch == 'm') {
 740                 if (inbuf[1] == '-')
 741                         cmsg = prevmsg;
 742                 else if (isdigit(inbuf[1]))
 743                         cmsg = atoi(&inbuf[1]);
 744                 else
 745                         cmsg = msg;
 746                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
 747
 748                 oldpos = ftell(newmsg);
 749
 750                 cpfrom = fopen(fname, "r");
 751                 if (!cpfrom) {
 752                         printf("Message %d not found\n", cmsg);
 753                         ask (prompt);
 754                         return;
 755                 }
 756
 757                 if (inch == 's') {
 758                         in = nxtfld(inbuf);
 759                         if (*in) {
 760                                 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
 761                                         fname[n] = in[n];
 762                                 }
 763                                 fname[n] = '\0';
 764                         }
 765                         else
 766                                 strcpy(fname, "Messages");
 767                         fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
 768                 }
 769                 else {
 770                         strcpy(fname, _PATH_TMP);
 771                         fd = mkstemp(fname);
 772                         if (fd != -1) {
 773                                 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
 774                                     fname);
 775                                 mailing = YES;
 776                         }
 777                 }
 778                 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
 779                         if (fd != -1)
 780                                 close(fd);
 781                         warn("%s", fname);
 782                         mailing = NO;
 783                         fseek(newmsg, oldpos, 0);
 784                         ask(prompt);
 785                         return;
 786                 }
 787
 788                 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
 789                         fwrite(inbuf, 1, n, cpto);
 790
 791                 fclose(cpfrom);
 792                 fclose(cpto);
 793                 fseek(newmsg, oldpos, 0);       /* reposition current message */
 794                 if (inch == 's')
 795                         printf("Message %d saved in \"%s\"\n", cmsg, fname);
 796                 else {
 797                         system(cmdbuf);
 798                         unlink(fname);
 799                         mailing = NO;
 800                 }
 801                 ask(prompt);
 802         }
 803 }
 804
 805 void
 806 gfrsub(FILE *infile)
 807 {
 808         off_t frompos;
 809         int count;
 810
 811         seensubj = seenfrom = NO;
 812         local = YES;
 813         subj[0] = from[0] = date[0] = '\0';
 814
 815         /*
 816          * Is this a normal message?
 817          */
 818         if (fgets(inbuf, sizeof inbuf, infile)) {
 819                 if (strncmp(inbuf, "From", 4)==0) {
 820                         /*
 821                          * expected form starts with From
 822                          */
 823                         seenfrom = YES;
 824                         frompos = ftell(infile);
 825                         ptr = from;
 826                         in = nxtfld(inbuf);
 827                         if (*in) {
 828                                 count = sizeof(from) - 1;
 829                                 while (*in && *in > ' ' && count-- > 0) {
 830                                         if (*in == ':' || *in == '@' ||
 831                                             *in == '!')
 832                                                 local = NO;
 833                                         *ptr++ = *in++;
 834                                 }
 835                         }
 836                         *ptr = '\0';
 837                         if (*(in = nxtfld(in)))
 838                                 strncpy(date, in, sizeof date);
 839                         else {
 840                                 date[0] = '\n';
 841                                 date[1] = '\0';
 842                         }
 843                 }
 844                 else {
 845                         /*
 846                          * not the expected form
 847                          */
 848                         fseek(infile, 0L, 0);
 849                         return;
 850                 }
 851         }
 852         else
 853                 /*
 854                  * empty file ?
 855                  */
 856                 return;
 857
 858         /*
 859          * look for Subject line until EOF or a blank line
 860          */
 861         while (fgets(inbuf, sizeof inbuf, infile)
 862             && !(blankline = (inbuf[0] == '\n'))) {
 863                 /*
 864                  * extract Subject line
 865                  */
 866                 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
 867                         seensubj = YES;
 868                         frompos = ftell(infile);
 869                         strncpy(subj, nxtfld(inbuf), sizeof subj);
 870                 }
 871         }
 872         if (!blankline)
 873                 /*
 874                  * ran into EOF
 875                  */
 876                 fseek(infile, frompos, 0);
 877
 878         if (!seensubj)
 879                 /*
 880                  * for possible use with Mail
 881                  */
 882                 strncpy(subj, "(No Subject)\n", sizeof subj);
 883 }
 884
 885 char *
 886 nxtfld(unsigned char *s)
 887 {
 888         if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
 889         if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
 890         return (s);
 891 }