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 1.2 2003/06/17 04:29:29 dillon 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 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 __P((char *));
 146 void gfrsub __P((FILE *));
 147 int linecnt __P((FILE *));
 148 int next __P((char *));
 149 char *nxtfld __P((unsigned char *));
 150 void onsusp __P((int));
 151 void onintr __P((int));
 152 void prmesg __P((int));
 153 static void usage __P((void));
 154
 155 int
 156 main(argc, argv)
 157 int argc; char *argv[];
 158 {
 159         bool newrc, already;
 160         int rcfirst = 0;                /* first message to print (from .rc) */
 161         int rcback = 0;                 /* amount to back off of rcfirst */
 162         int firstmsg = 0, nextmsg = 0, lastmsg = 0;
 163         int blast = 0;
 164         struct stat buf;                /* stat to check access of bounds */
 165         FILE *bounds;
 166
 167 #ifdef UNBUFFERED
 168         setbuf(stdout, NULL);
 169 #endif
 170         setlocale(LC_ALL, "");
 171
 172         time(&t);
 173         setuid(uid = getuid());
 174         ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
 175         if (ruptible)
 176                 signal(SIGINT, SIG_DFL);
 177
 178         argc--, argv++;
 179         while (argc > 0) {
 180                 if (isdigit(argv[0][0])) {      /* starting message # */
 181                         rcfirst = atoi(argv[0]);
 182                 }
 183                 else if (isdigit(argv[0][1])) { /* backward offset */
 184                         rcback = atoi( &( argv[0][1] ) );
 185                 }
 186                 else {
 187                         ptr = *argv;
 188                         while (*ptr) switch (*ptr++) {
 189
 190                         case '-':
 191                                 break;
 192
 193                         case 'c':
 194                                 if (uid != SUPERUSER && uid != DAEMON) {
 195                                         fprintf(stderr, "Sorry\n");
 196                                         exit(1);
 197                                 }
 198                                 clean = YES;
 199                                 break;
 200
 201                         case 'f':               /* silently */
 202                                 hush = YES;
 203                                 break;
 204
 205                         case 'h':               /* headers only */
 206                                 hdrs = YES;
 207                                 break;
 208
 209                         case 'l':               /* local msgs only */
 210                                 locomode = YES;
 211                                 break;
 212
 213                         case 'o':               /* option to save last message */
 214                                 lastcmd = YES;
 215                                 break;
 216
 217                         case 'p':               /* pipe thru 'more' during long msgs */
 218                                 use_pager = YES;
 219                                 break;
 220
 221                         case 'q':               /* query only */
 222                                 qopt = YES;
 223                                 break;
 224
 225                         case 's':               /* sending TO msgs */
 226                                 send_msg = YES;
 227                                 break;
 228
 229                         default:
 230                                 usage();
 231                         }
 232                 }
 233                 argc--, argv++;
 234         }
 235
 236         /*
 237          * determine current message bounds
 238          */
 239         snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS);
 240
 241         /*
 242          * Test access rights to the bounds file
 243          * This can be a little tricky.  if(send_msg), then
 244          * we will create it.  We assume that if(send_msg),
 245          * then you have write permission there.
 246          * Else, it better be there, or we bail.
 247          */
 248         if (send_msg != YES) {
 249                 if (stat(fname, &buf) < 0) {
 250                         if (hush != YES) {
 251                                 err(errno, "%s", fname);
 252                         } else {
 253                                 exit(1);
 254                         }
 255                 }
 256         }
 257         bounds = fopen(fname, "r");
 258
 259         if (bounds != NULL) {
 260                 fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg);
 261                 fclose(bounds);
 262                 blast = lastmsg;        /* save upper bound */
 263         }
 264
 265         if (clean)
 266                 keep = t - (rcback? rcback : NDAYS) DAYS;
 267
 268         if (clean || bounds == NULL) {  /* relocate message bounds */
 269                 struct dirent *dp;
 270                 struct stat stbuf;
 271                 bool seenany = NO;
 272                 DIR     *dirp;
 273
 274                 dirp = opendir(_PATH_MSGS);
 275                 if (dirp == NULL)
 276                         err(errno, "%s", _PATH_MSGS);
 277
 278                 firstmsg = 32767;
 279                 lastmsg = 0;
 280
 281                 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
 282                         register char *cp = dp->d_name;
 283                         register int i = 0;
 284
 285                         if (dp->d_ino == 0)
 286                                 continue;
 287                         if (dp->d_namlen == 0)
 288                                 continue;
 289
 290                         if (clean)
 291                                 snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp);
 292
 293                         while (isdigit(*cp))
 294                                 i = i * 10 + *cp++ - '0';
 295                         if (*cp)
 296                                 continue;       /* not a message! */
 297
 298                         if (clean) {
 299                                 if (stat(inbuf, &stbuf) != 0)
 300                                         continue;
 301                                 if (stbuf.st_mtime < keep
 302                                     && stbuf.st_mode&S_IWRITE) {
 303                                         unlink(inbuf);
 304                                         continue;
 305                                 }
 306                         }
 307
 308                         if (i > lastmsg)
 309                                 lastmsg = i;
 310                         if (i < firstmsg)
 311                                 firstmsg = i;
 312                         seenany = YES;
 313                 }
 314                 closedir(dirp);
 315
 316                 if (!seenany) {
 317                         if (blast != 0) /* never lower the upper bound! */
 318                                 lastmsg = blast;
 319                         firstmsg = lastmsg + 1;
 320                 }
 321                 else if (blast > lastmsg)
 322                         lastmsg = blast;
 323
 324                 if (!send_msg) {
 325                         bounds = fopen(fname, "w");
 326                         if (bounds == NULL)
 327                                 err(errno, "%s", fname);
 328                         chmod(fname, CMODE);
 329                         fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
 330                         fclose(bounds);
 331                 }
 332         }
 333
 334         if (send_msg) {
 335                 /*
 336                  * Send mode - place msgs in _PATH_MSGS
 337                  */
 338                 bounds = fopen(fname, "w");
 339                 if (bounds == NULL)
 340                         err(errno, "%s", fname);
 341
 342                 nextmsg = lastmsg + 1;
 343                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg);
 344                 newmsg = fopen(fname, "w");
 345                 if (newmsg == NULL)
 346                         err(errno, "%s", fname);
 347                 chmod(fname, CMODE);
 348
 349                 fprintf(bounds, "%d %d\n", firstmsg, nextmsg);
 350                 fclose(bounds);
 351
 352                 sending = YES;
 353                 if (ruptible)
 354                         signal(SIGINT, onintr);
 355
 356                 if (isatty(fileno(stdin))) {
 357                         ptr = getpwuid(uid)->pw_name;
 358                         printf("Message %d:\nFrom %s %sSubject: ",
 359                                 nextmsg, ptr, ctime(&t));
 360                         fflush(stdout);
 361                         fgets(inbuf, sizeof inbuf, stdin);
 362                         putchar('\n');
 363                         fflush(stdout);
 364                         fprintf(newmsg, "From %s %sSubject: %s\n",
 365                                 ptr, ctime(&t), inbuf);
 366                         blankline = seensubj = YES;
 367                 }
 368                 else
 369                         blankline = seensubj = NO;
 370                 for (;;) {
 371                         fgets(inbuf, sizeof inbuf, stdin);
 372                         if (feof(stdin) || ferror(stdin))
 373                                 break;
 374                         blankline = (blankline || (inbuf[0] == '\n'));
 375                         seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
 376                         fputs(inbuf, newmsg);
 377                 }
 378 #ifdef OBJECT
 379                 if (!seensubj) {
 380                         printf("NOTICE: Messages should have a Subject field!\n");
 381 #ifdef REJECT
 382                         unlink(fname);
 383 #endif
 384                         exit(1);
 385                 }
 386 #endif
 387                 exit(ferror(stdin));
 388         }
 389         if (clean)
 390                 exit(0);
 391
 392         /*
 393          * prepare to display messages
 394          */
 395         totty = (isatty(fileno(stdout)) != 0);
 396         use_pager = use_pager && totty;
 397
 398         snprintf(fname, sizeof(fname), "%s/%s", getenv("HOME"), MSGSRC);
 399         msgsrc = fopen(fname, "r");
 400         if (msgsrc) {
 401                 newrc = NO;
 402                 fscanf(msgsrc, "%d\n", &nextmsg);
 403                 fclose(msgsrc);
 404                 if (nextmsg > lastmsg+1) {
 405                         printf("Warning: bounds have been reset (%d, %d)\n",
 406                                 firstmsg, lastmsg);
 407                         truncate(fname, (off_t)0);
 408                         newrc = YES;
 409                 }
 410                 else if (!rcfirst)
 411                         rcfirst = nextmsg - rcback;
 412         }
 413         else
 414                 newrc = YES;
 415         msgsrc = fopen(fname, "r+");
 416         if (msgsrc == NULL)
 417                 msgsrc = fopen(fname, "w");
 418         if (msgsrc == NULL)
 419                 err(errno, "%s", fname);
 420         if (rcfirst) {
 421                 if (rcfirst > lastmsg+1) {
 422                         printf("Warning: the last message is number %d.\n",
 423                                 lastmsg);
 424                         rcfirst = nextmsg;
 425                 }
 426                 if (rcfirst > firstmsg)
 427                         firstmsg = rcfirst;     /* don't set below first msg */
 428         }
 429         if (newrc) {
 430                 nextmsg = firstmsg;
 431                 fseek(msgsrc, 0L, 0);
 432                 fprintf(msgsrc, "%d\n", nextmsg);
 433                 fflush(msgsrc);
 434         }
 435
 436 #ifdef V7
 437         if (totty) {
 438                 struct winsize win;
 439                 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
 440                         Lpp = win.ws_row;
 441                 if (Lpp <= 0) {
 442                         if (tgetent(inbuf, getenv("TERM")) <= 0
 443                             || (Lpp = tgetnum("li")) <= 0) {
 444                                 Lpp = NLINES;
 445                         }
 446                 }
 447         }
 448 #endif
 449         Lpp -= 6;       /* for headers, etc. */
 450
 451         already = NO;
 452         prevmsg = firstmsg;
 453         printing = YES;
 454         if (ruptible)
 455                 signal(SIGINT, onintr);
 456
 457         /*
 458          * Main program loop
 459          */
 460         for (msg = firstmsg; msg <= lastmsg; msg++) {
 461
 462                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
 463                 newmsg = fopen(fname, "r");
 464                 if (newmsg == NULL)
 465                         continue;
 466
 467                 gfrsub(newmsg);         /* get From and Subject fields */
 468                 if (locomode && !local) {
 469                         fclose(newmsg);
 470                         continue;
 471                 }
 472
 473                 if (qopt) {     /* This has to be located here */
 474                         printf("There are new messages.\n");
 475                         exit(0);
 476                 }
 477
 478                 if (already && !hdrs)
 479                         putchar('\n');
 480
 481                 /*
 482                  * Print header
 483                  */
 484                 if (totty)
 485                         signal(SIGTSTP, onsusp);
 486                 (void) setjmp(tstpbuf);
 487                 already = YES;
 488                 nlines = 2;
 489                 if (seenfrom) {
 490                         printf("Message %d:\nFrom %s %s", msg, from, date);
 491                         nlines++;
 492                 }
 493                 if (seensubj) {
 494                         printf("Subject: %s", subj);
 495                         nlines++;
 496                 }
 497                 else {
 498                         if (seenfrom) {
 499                                 putchar('\n');
 500                                 nlines++;
 501                         }
 502                         while (nlines < 6
 503                             && fgets(inbuf, sizeof inbuf, newmsg)
 504                             && inbuf[0] != '\n') {
 505                                 fputs(inbuf, stdout);
 506                                 nlines++;
 507                         }
 508                 }
 509
 510                 lct = linecnt(newmsg);
 511                 if (lct)
 512                         printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
 513                             (lct == 1) ? "" : "s");
 514
 515                 if (hdrs) {
 516                         printf("\n-----\n");
 517                         fclose(newmsg);
 518                         continue;
 519                 }
 520
 521                 /*
 522                  * Ask user for command
 523                  */
 524                 if (totty)
 525                         ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
 526                 else
 527                         inbuf[0] = 'y';
 528                 if (totty)
 529                         signal(SIGTSTP, SIG_DFL);
 530 cmnd:
 531                 in = inbuf;
 532                 switch (*in) {
 533                         case 'x':
 534                         case 'X':
 535                                 exit(0);
 536
 537                         case 'q':
 538                         case 'Q':
 539                                 quitit = YES;
 540                                 printf("--Postponed--\n");
 541                                 exit(0);
 542                                 /* intentional fall-thru */
 543                         case 'n':
 544                         case 'N':
 545                                 if (msg >= nextmsg) sep = "Flushed";
 546                                 prevmsg = msg;
 547                                 break;
 548
 549                         case 'p':
 550                         case 'P':
 551                                 use_pager = (*in++ == 'p');
 552                                 /* intentional fallthru */
 553                         case '\n':
 554                         case 'y':
 555                         default:
 556                                 if (*in == '-') {
 557                                         msg = prevmsg-1;
 558                                         sep = "replay";
 559                                         break;
 560                                 }
 561                                 if (isdigit(*in)) {
 562                                         msg = next(in);
 563                                         sep = in;
 564                                         break;
 565                                 }
 566
 567                                 prmesg(nlines + lct + (seensubj? 1 : 0));
 568                                 prevmsg = msg;
 569
 570                 }
 571
 572                 printf("--%s--\n", sep);
 573                 sep = "-";
 574                 if (msg >= nextmsg) {
 575                         nextmsg = msg + 1;
 576                         fseek(msgsrc, 0L, 0);
 577                         fprintf(msgsrc, "%d\n", nextmsg);
 578                         fflush(msgsrc);
 579                 }
 580                 if (newmsg)
 581                         fclose(newmsg);
 582                 if (quitit)
 583                         break;
 584         }
 585
 586         /*
 587          * Make sure .rc file gets updated
 588          */
 589         if (--msg >= nextmsg) {
 590                 nextmsg = msg + 1;
 591                 fseek(msgsrc, 0L, 0);
 592                 fprintf(msgsrc, "%d\n", nextmsg);
 593                 fflush(msgsrc);
 594         }
 595         if (already && !quitit && lastcmd && totty) {
 596                 /*
 597                  * save or reply to last message?
 598                  */
 599                 msg = prevmsg;
 600                 ask(NOMORE);
 601                 if (inbuf[0] == '-' || isdigit(inbuf[0]))
 602                         goto cmnd;
 603         }
 604         if (!(already || hush || qopt))
 605                 printf("No new messages.\n");
 606         exit(0);
 607 }
 608
 609 static void
 610 usage()
 611 {
 612         fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
 613         exit(1);
 614 }
 615
 616 void
 617 prmesg(length)
 618 int length;
 619 {
 620         FILE *outf;
 621         char *env_pager;
 622
 623         if (use_pager && length > Lpp) {
 624                 signal(SIGPIPE, SIG_IGN);
 625                 signal(SIGQUIT, SIG_IGN);
 626                 if ((env_pager = getenv("PAGER")) == NULL) {
 627                         snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
 628                 } else {
 629                         snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
 630                 }
 631                 outf = popen(cmdbuf, "w");
 632                 if (!outf)
 633                         outf = stdout;
 634                 else
 635                         setbuf(outf, (char *)NULL);
 636         }
 637         else
 638                 outf = stdout;
 639
 640         if (seensubj)
 641                 putc('\n', outf);
 642
 643         while (fgets(inbuf, sizeof inbuf, newmsg)) {
 644                 fputs(inbuf, outf);
 645                 if (ferror(outf)) {
 646                         clearerr(outf);
 647                         break;
 648                 }
 649         }
 650
 651         if (outf != stdout) {
 652                 pclose(outf);
 653                 signal(SIGPIPE, SIG_DFL);
 654                 signal(SIGQUIT, SIG_DFL);
 655         }
 656         else {
 657                 fflush(stdout);
 658         }
 659
 660         /* force wait on output */
 661         tcdrain(fileno(stdout));
 662 }
 663
 664 void
 665 onintr(unused)
 666         int unused;
 667 {
 668         signal(SIGINT, onintr);
 669         if (mailing)
 670                 unlink(fname);
 671         if (sending) {
 672                 unlink(fname);
 673                 puts("--Killed--");
 674                 exit(1);
 675         }
 676         if (printing) {
 677                 putchar('\n');
 678                 if (hdrs)
 679                         exit(0);
 680                 sep = "Interrupt";
 681                 if (newmsg)
 682                         fseek(newmsg, 0L, 2);
 683                 intrpflg = YES;
 684         }
 685 }
 686
 687 /*
 688  * We have just gotten a susp.  Suspend and prepare to resume.
 689  */
 690 void
 691 onsusp(unused)
 692         int unused;
 693 {
 694         signal(SIGTSTP, SIG_DFL);
 695         sigsetmask(0);
 696         kill(0, SIGTSTP);
 697         signal(SIGTSTP, onsusp);
 698         if (!mailing)
 699                 longjmp(tstpbuf, 0);
 700 }
 701
 702 int
 703 linecnt(f)
 704 FILE *f;
 705 {
 706         off_t oldpos = ftell(f);
 707         int l = 0;
 708         char lbuf[BUFSIZ];
 709
 710         while (fgets(lbuf, sizeof lbuf, f))
 711                 l++;
 712         clearerr(f);
 713         fseek(f, oldpos, 0);
 714         return (l);
 715 }
 716
 717 int
 718 next(buf)
 719 char *buf;
 720 {
 721         int i;
 722         sscanf(buf, "%d", &i);
 723         sprintf(buf, "Goto %d", i);
 724         return(--i);
 725 }
 726
 727 void
 728 ask(prompt)
 729 char *prompt;
 730 {
 731         char    inch;
 732         int     n, cmsg, fd;
 733         off_t   oldpos;
 734         FILE    *cpfrom, *cpto;
 735
 736         printf("%s ", prompt);
 737         fflush(stdout);
 738         intrpflg = NO;
 739         (void) fgets(inbuf, sizeof inbuf, stdin);
 740         if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
 741                 inbuf[n - 1] = '\0';
 742         if (intrpflg)
 743                 inbuf[0] = 'x';
 744
 745         /*
 746          * Handle 'mail' and 'save' here.
 747          */
 748         if ((inch = inbuf[0]) == 's' || inch == 'm') {
 749                 if (inbuf[1] == '-')
 750                         cmsg = prevmsg;
 751                 else if (isdigit(inbuf[1]))
 752                         cmsg = atoi(&inbuf[1]);
 753                 else
 754                         cmsg = msg;
 755                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
 756
 757                 oldpos = ftell(newmsg);
 758
 759                 cpfrom = fopen(fname, "r");
 760                 if (!cpfrom) {
 761                         printf("Message %d not found\n", cmsg);
 762                         ask (prompt);
 763                         return;
 764                 }
 765
 766                 if (inch == 's') {
 767                         in = nxtfld(inbuf);
 768                         if (*in) {
 769                                 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
 770                                         fname[n] = in[n];
 771                                 }
 772                                 fname[n] = NULL;
 773                         }
 774                         else
 775                                 strcpy(fname, "Messages");
 776                         fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
 777                 }
 778                 else {
 779                         strcpy(fname, _PATH_TMP);
 780                         fd = mkstemp(fname);
 781                         if (fd != -1) {
 782                                 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
 783                                     fname);
 784                                 mailing = YES;
 785                         }
 786                 }
 787                 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
 788                         if (fd != -1)
 789                                 close(fd);
 790                         warn("%s", fname);
 791                         mailing = NO;
 792                         fseek(newmsg, oldpos, 0);
 793                         ask(prompt);
 794                         return;
 795                 }
 796
 797                 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
 798                         fwrite(inbuf, 1, n, cpto);
 799
 800                 fclose(cpfrom);
 801                 fclose(cpto);
 802                 fseek(newmsg, oldpos, 0);       /* reposition current message */
 803                 if (inch == 's')
 804                         printf("Message %d saved in \"%s\"\n", cmsg, fname);
 805                 else {
 806                         system(cmdbuf);
 807                         unlink(fname);
 808                         mailing = NO;
 809                 }
 810                 ask(prompt);
 811         }
 812 }
 813
 814 void
 815 gfrsub(infile)
 816 FILE *infile;
 817 {
 818         off_t frompos;
 819         int count;
 820
 821         seensubj = seenfrom = NO;
 822         local = YES;
 823         subj[0] = from[0] = date[0] = NULL;
 824
 825         /*
 826          * Is this a normal message?
 827          */
 828         if (fgets(inbuf, sizeof inbuf, infile)) {
 829                 if (strncmp(inbuf, "From", 4)==0) {
 830                         /*
 831                          * expected form starts with From
 832                          */
 833                         seenfrom = YES;
 834                         frompos = ftell(infile);
 835                         ptr = from;
 836                         in = nxtfld(inbuf);
 837                         if (*in) {
 838                                 count = sizeof(from) - 1;
 839                                 while (*in && *in > ' ' && count-- > 0) {
 840                                         if (*in == ':' || *in == '@' ||
 841                                             *in == '!')
 842                                                 local = NO;
 843                                         *ptr++ = *in++;
 844                                 }
 845                         }
 846                         *ptr = NULL;
 847                         if (*(in = nxtfld(in)))
 848                                 strncpy(date, in, sizeof date);
 849                         else {
 850                                 date[0] = '\n';
 851                                 date[1] = NULL;
 852                         }
 853                 }
 854                 else {
 855                         /*
 856                          * not the expected form
 857                          */
 858                         fseek(infile, 0L, 0);
 859                         return;
 860                 }
 861         }
 862         else
 863                 /*
 864                  * empty file ?
 865                  */
 866                 return;
 867
 868         /*
 869          * look for Subject line until EOF or a blank line
 870          */
 871         while (fgets(inbuf, sizeof inbuf, infile)
 872             && !(blankline = (inbuf[0] == '\n'))) {
 873                 /*
 874                  * extract Subject line
 875                  */
 876                 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
 877                         seensubj = YES;
 878                         frompos = ftell(infile);
 879                         strncpy(subj, nxtfld(inbuf), sizeof subj);
 880                 }
 881         }
 882         if (!blankline)
 883                 /*
 884                  * ran into EOF
 885                  */
 886                 fseek(infile, frompos, 0);
 887
 888         if (!seensubj)
 889                 /*
 890                  * for possible use with Mail
 891                  */
 892                 strncpy(subj, "(No Subject)\n", sizeof subj);
 893 }
 894
 895 char *
 896 nxtfld(s)
 897 unsigned char *s;
 898 {
 899         if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
 900         if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
 901         return (s);
 902 }