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 1.3 2003/10/04 20:36:49 hmp 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(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                         register char *cp = dp->d_name;
 282                         register int i = 0;
 283
 284                         if (dp->d_ino == 0)
 285                                 continue;
 286                         if (dp->d_namlen == 0)
 287                                 continue;
 288
 289                         if (clean)
 290                                 snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp);
 291
 292                         while (isdigit(*cp))
 293                                 i = i * 10 + *cp++ - '0';
 294                         if (*cp)
 295                                 continue;       /* not a message! */
 296
 297                         if (clean) {
 298                                 if (stat(inbuf, &stbuf) != 0)
 299                                         continue;
 300                                 if (stbuf.st_mtime < keep
 301                                     && stbuf.st_mode&S_IWRITE) {
 302                                         unlink(inbuf);
 303                                         continue;
 304                                 }
 305                         }
 306
 307                         if (i > lastmsg)
 308                                 lastmsg = i;
 309                         if (i < firstmsg)
 310                                 firstmsg = i;
 311                         seenany = YES;
 312                 }
 313                 closedir(dirp);
 314
 315                 if (!seenany) {
 316                         if (blast != 0) /* never lower the upper bound! */
 317                                 lastmsg = blast;
 318                         firstmsg = lastmsg + 1;
 319                 }
 320                 else if (blast > lastmsg)
 321                         lastmsg = blast;
 322
 323                 if (!send_msg) {
 324                         bounds = fopen(fname, "w");
 325                         if (bounds == NULL)
 326                                 err(errno, "%s", fname);
 327                         chmod(fname, CMODE);
 328                         fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
 329                         fclose(bounds);
 330                 }
 331         }
 332
 333         if (send_msg) {
 334                 /*
 335                  * Send mode - place msgs in _PATH_MSGS
 336                  */
 337                 bounds = fopen(fname, "w");
 338                 if (bounds == NULL)
 339                         err(errno, "%s", fname);
 340
 341                 nextmsg = lastmsg + 1;
 342                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg);
 343                 newmsg = fopen(fname, "w");
 344                 if (newmsg == NULL)
 345                         err(errno, "%s", fname);
 346                 chmod(fname, CMODE);
 347
 348                 fprintf(bounds, "%d %d\n", firstmsg, nextmsg);
 349                 fclose(bounds);
 350
 351                 sending = YES;
 352                 if (ruptible)
 353                         signal(SIGINT, onintr);
 354
 355                 if (isatty(fileno(stdin))) {
 356                         ptr = getpwuid(uid)->pw_name;
 357                         printf("Message %d:\nFrom %s %sSubject: ",
 358                                 nextmsg, ptr, ctime(&t));
 359                         fflush(stdout);
 360                         fgets(inbuf, sizeof inbuf, stdin);
 361                         putchar('\n');
 362                         fflush(stdout);
 363                         fprintf(newmsg, "From %s %sSubject: %s\n",
 364                                 ptr, ctime(&t), inbuf);
 365                         blankline = seensubj = YES;
 366                 }
 367                 else
 368                         blankline = seensubj = NO;
 369                 for (;;) {
 370                         fgets(inbuf, sizeof inbuf, stdin);
 371                         if (feof(stdin) || ferror(stdin))
 372                                 break;
 373                         blankline = (blankline || (inbuf[0] == '\n'));
 374                         seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
 375                         fputs(inbuf, newmsg);
 376                 }
 377 #ifdef OBJECT
 378                 if (!seensubj) {
 379                         printf("NOTICE: Messages should have a Subject field!\n");
 380 #ifdef REJECT
 381                         unlink(fname);
 382 #endif
 383                         exit(1);
 384                 }
 385 #endif
 386                 exit(ferror(stdin));
 387         }
 388         if (clean)
 389                 exit(0);
 390
 391         /*
 392          * prepare to display messages
 393          */
 394         totty = (isatty(fileno(stdout)) != 0);
 395         use_pager = use_pager && totty;
 396
 397         snprintf(fname, sizeof(fname), "%s/%s", getenv("HOME"), MSGSRC);
 398         msgsrc = fopen(fname, "r");
 399         if (msgsrc) {
 400                 newrc = NO;
 401                 fscanf(msgsrc, "%d\n", &nextmsg);
 402                 fclose(msgsrc);
 403                 if (nextmsg > lastmsg+1) {
 404                         printf("Warning: bounds have been reset (%d, %d)\n",
 405                                 firstmsg, lastmsg);
 406                         truncate(fname, (off_t)0);
 407                         newrc = YES;
 408                 }
 409                 else if (!rcfirst)
 410                         rcfirst = nextmsg - rcback;
 411         }
 412         else
 413                 newrc = YES;
 414         msgsrc = fopen(fname, "r+");
 415         if (msgsrc == NULL)
 416                 msgsrc = fopen(fname, "w");
 417         if (msgsrc == NULL)
 418                 err(errno, "%s", fname);
 419         if (rcfirst) {
 420                 if (rcfirst > lastmsg+1) {
 421                         printf("Warning: the last message is number %d.\n",
 422                                 lastmsg);
 423                         rcfirst = nextmsg;
 424                 }
 425                 if (rcfirst > firstmsg)
 426                         firstmsg = rcfirst;     /* don't set below first msg */
 427         }
 428         if (newrc) {
 429                 nextmsg = firstmsg;
 430                 fseek(msgsrc, 0L, 0);
 431                 fprintf(msgsrc, "%d\n", nextmsg);
 432                 fflush(msgsrc);
 433         }
 434
 435 #ifdef V7
 436         if (totty) {
 437                 struct winsize win;
 438                 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
 439                         Lpp = win.ws_row;
 440                 if (Lpp <= 0) {
 441                         if (tgetent(inbuf, getenv("TERM")) <= 0
 442                             || (Lpp = tgetnum("li")) <= 0) {
 443                                 Lpp = NLINES;
 444                         }
 445                 }
 446         }
 447 #endif
 448         Lpp -= 6;       /* for headers, etc. */
 449
 450         already = NO;
 451         prevmsg = firstmsg;
 452         printing = YES;
 453         if (ruptible)
 454                 signal(SIGINT, onintr);
 455
 456         /*
 457          * Main program loop
 458          */
 459         for (msg = firstmsg; msg <= lastmsg; msg++) {
 460
 461                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
 462                 newmsg = fopen(fname, "r");
 463                 if (newmsg == NULL)
 464                         continue;
 465
 466                 gfrsub(newmsg);         /* get From and Subject fields */
 467                 if (locomode && !local) {
 468                         fclose(newmsg);
 469                         continue;
 470                 }
 471
 472                 if (qopt) {     /* This has to be located here */
 473                         printf("There are new messages.\n");
 474                         exit(0);
 475                 }
 476
 477                 if (already && !hdrs)
 478                         putchar('\n');
 479
 480                 /*
 481                  * Print header
 482                  */
 483                 if (totty)
 484                         signal(SIGTSTP, onsusp);
 485                 (void) setjmp(tstpbuf);
 486                 already = YES;
 487                 nlines = 2;
 488                 if (seenfrom) {
 489                         printf("Message %d:\nFrom %s %s", msg, from, date);
 490                         nlines++;
 491                 }
 492                 if (seensubj) {
 493                         printf("Subject: %s", subj);
 494                         nlines++;
 495                 }
 496                 else {
 497                         if (seenfrom) {
 498                                 putchar('\n');
 499                                 nlines++;
 500                         }
 501                         while (nlines < 6
 502                             && fgets(inbuf, sizeof inbuf, newmsg)
 503                             && inbuf[0] != '\n') {
 504                                 fputs(inbuf, stdout);
 505                                 nlines++;
 506                         }
 507                 }
 508
 509                 lct = linecnt(newmsg);
 510                 if (lct)
 511                         printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
 512                             (lct == 1) ? "" : "s");
 513
 514                 if (hdrs) {
 515                         printf("\n-----\n");
 516                         fclose(newmsg);
 517                         continue;
 518                 }
 519
 520                 /*
 521                  * Ask user for command
 522                  */
 523                 if (totty)
 524                         ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
 525                 else
 526                         inbuf[0] = 'y';
 527                 if (totty)
 528                         signal(SIGTSTP, SIG_DFL);
 529 cmnd:
 530                 in = inbuf;
 531                 switch (*in) {
 532                         case 'x':
 533                         case 'X':
 534                                 exit(0);
 535
 536                         case 'q':
 537                         case 'Q':
 538                                 quitit = YES;
 539                                 printf("--Postponed--\n");
 540                                 exit(0);
 541                                 /* intentional fall-thru */
 542                         case 'n':
 543                         case 'N':
 544                                 if (msg >= nextmsg) sep = "Flushed";
 545                                 prevmsg = msg;
 546                                 break;
 547
 548                         case 'p':
 549                         case 'P':
 550                                 use_pager = (*in++ == 'p');
 551                                 /* intentional fallthru */
 552                         case '\n':
 553                         case 'y':
 554                         default:
 555                                 if (*in == '-') {
 556                                         msg = prevmsg-1;
 557                                         sep = "replay";
 558                                         break;
 559                                 }
 560                                 if (isdigit(*in)) {
 561                                         msg = next(in);
 562                                         sep = in;
 563                                         break;
 564                                 }
 565
 566                                 prmesg(nlines + lct + (seensubj? 1 : 0));
 567                                 prevmsg = msg;
 568
 569                 }
 570
 571                 printf("--%s--\n", sep);
 572                 sep = "-";
 573                 if (msg >= nextmsg) {
 574                         nextmsg = msg + 1;
 575                         fseek(msgsrc, 0L, 0);
 576                         fprintf(msgsrc, "%d\n", nextmsg);
 577                         fflush(msgsrc);
 578                 }
 579                 if (newmsg)
 580                         fclose(newmsg);
 581                 if (quitit)
 582                         break;
 583         }
 584
 585         /*
 586          * Make sure .rc file gets updated
 587          */
 588         if (--msg >= nextmsg) {
 589                 nextmsg = msg + 1;
 590                 fseek(msgsrc, 0L, 0);
 591                 fprintf(msgsrc, "%d\n", nextmsg);
 592                 fflush(msgsrc);
 593         }
 594         if (already && !quitit && lastcmd && totty) {
 595                 /*
 596                  * save or reply to last message?
 597                  */
 598                 msg = prevmsg;
 599                 ask(NOMORE);
 600                 if (inbuf[0] == '-' || isdigit(inbuf[0]))
 601                         goto cmnd;
 602         }
 603         if (!(already || hush || qopt))
 604                 printf("No new messages.\n");
 605         exit(0);
 606 }
 607
 608 static void
 609 usage(void)
 610 {
 611         fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
 612         exit(1);
 613 }
 614
 615 void
 616 prmesg(int length)
 617 {
 618         FILE *outf;
 619         char *env_pager;
 620
 621         if (use_pager && length > Lpp) {
 622                 signal(SIGPIPE, SIG_IGN);
 623                 signal(SIGQUIT, SIG_IGN);
 624                 if ((env_pager = getenv("PAGER")) == NULL) {
 625                         snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
 626                 } else {
 627                         snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
 628                 }
 629                 outf = popen(cmdbuf, "w");
 630                 if (!outf)
 631                         outf = stdout;
 632                 else
 633                         setbuf(outf, (char *)NULL);
 634         }
 635         else
 636                 outf = stdout;
 637
 638         if (seensubj)
 639                 putc('\n', outf);
 640
 641         while (fgets(inbuf, sizeof inbuf, newmsg)) {
 642                 fputs(inbuf, outf);
 643                 if (ferror(outf)) {
 644                         clearerr(outf);
 645                         break;
 646                 }
 647         }
 648
 649         if (outf != stdout) {
 650                 pclose(outf);
 651                 signal(SIGPIPE, SIG_DFL);
 652                 signal(SIGQUIT, SIG_DFL);
 653         }
 654         else {
 655                 fflush(stdout);
 656         }
 657
 658         /* force wait on output */
 659         tcdrain(fileno(stdout));
 660 }
 661
 662 void
 663 onintr(int unused)
 664 {
 665         signal(SIGINT, onintr);
 666         if (mailing)
 667                 unlink(fname);
 668         if (sending) {
 669                 unlink(fname);
 670                 puts("--Killed--");
 671                 exit(1);
 672         }
 673         if (printing) {
 674                 putchar('\n');
 675                 if (hdrs)
 676                         exit(0);
 677                 sep = "Interrupt";
 678                 if (newmsg)
 679                         fseek(newmsg, 0L, 2);
 680                 intrpflg = YES;
 681         }
 682 }
 683
 684 /*
 685  * We have just gotten a susp.  Suspend and prepare to resume.
 686  */
 687 void
 688 onsusp(int unused)
 689 {
 690         signal(SIGTSTP, SIG_DFL);
 691         sigsetmask(0);
 692         kill(0, SIGTSTP);
 693         signal(SIGTSTP, onsusp);
 694         if (!mailing)
 695                 longjmp(tstpbuf, 0);
 696 }
 697
 698 int
 699 linecnt(FILE *f)
 700 {
 701         off_t oldpos = ftell(f);
 702         int l = 0;
 703         char lbuf[BUFSIZ];
 704
 705         while (fgets(lbuf, sizeof lbuf, f))
 706                 l++;
 707         clearerr(f);
 708         fseek(f, oldpos, 0);
 709         return (l);
 710 }
 711
 712 int
 713 next(char *buf)
 714 {
 715         int i;
 716         sscanf(buf, "%d", &i);
 717         sprintf(buf, "Goto %d", i);
 718         return(--i);
 719 }
 720
 721 void
 722 ask(char *prompt)
 723 {
 724         char    inch;
 725         int     n, cmsg, fd;
 726         off_t   oldpos;
 727         FILE    *cpfrom, *cpto;
 728
 729         printf("%s ", prompt);
 730         fflush(stdout);
 731         intrpflg = NO;
 732         (void) fgets(inbuf, sizeof inbuf, stdin);
 733         if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
 734                 inbuf[n - 1] = '\0';
 735         if (intrpflg)
 736                 inbuf[0] = 'x';
 737
 738         /*
 739          * Handle 'mail' and 'save' here.
 740          */
 741         if ((inch = inbuf[0]) == 's' || inch == 'm') {
 742                 if (inbuf[1] == '-')
 743                         cmsg = prevmsg;
 744                 else if (isdigit(inbuf[1]))
 745                         cmsg = atoi(&inbuf[1]);
 746                 else
 747                         cmsg = msg;
 748                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
 749
 750                 oldpos = ftell(newmsg);
 751
 752                 cpfrom = fopen(fname, "r");
 753                 if (!cpfrom) {
 754                         printf("Message %d not found\n", cmsg);
 755                         ask (prompt);
 756                         return;
 757                 }
 758
 759                 if (inch == 's') {
 760                         in = nxtfld(inbuf);
 761                         if (*in) {
 762                                 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
 763                                         fname[n] = in[n];
 764                                 }
 765                                 fname[n] = NULL;
 766                         }
 767                         else
 768                                 strcpy(fname, "Messages");
 769                         fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
 770                 }
 771                 else {
 772                         strcpy(fname, _PATH_TMP);
 773                         fd = mkstemp(fname);
 774                         if (fd != -1) {
 775                                 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
 776                                     fname);
 777                                 mailing = YES;
 778                         }
 779                 }
 780                 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
 781                         if (fd != -1)
 782                                 close(fd);
 783                         warn("%s", fname);
 784                         mailing = NO;
 785                         fseek(newmsg, oldpos, 0);
 786                         ask(prompt);
 787                         return;
 788                 }
 789
 790                 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
 791                         fwrite(inbuf, 1, n, cpto);
 792
 793                 fclose(cpfrom);
 794                 fclose(cpto);
 795                 fseek(newmsg, oldpos, 0);       /* reposition current message */
 796                 if (inch == 's')
 797                         printf("Message %d saved in \"%s\"\n", cmsg, fname);
 798                 else {
 799                         system(cmdbuf);
 800                         unlink(fname);
 801                         mailing = NO;
 802                 }
 803                 ask(prompt);
 804         }
 805 }
 806
 807 void
 808 gfrsub(FILE *infile)
 809 {
 810         off_t frompos;
 811         int count;
 812
 813         seensubj = seenfrom = NO;
 814         local = YES;
 815         subj[0] = from[0] = date[0] = NULL;
 816
 817         /*
 818          * Is this a normal message?
 819          */
 820         if (fgets(inbuf, sizeof inbuf, infile)) {
 821                 if (strncmp(inbuf, "From", 4)==0) {
 822                         /*
 823                          * expected form starts with From
 824                          */
 825                         seenfrom = YES;
 826                         frompos = ftell(infile);
 827                         ptr = from;
 828                         in = nxtfld(inbuf);
 829                         if (*in) {
 830                                 count = sizeof(from) - 1;
 831                                 while (*in && *in > ' ' && count-- > 0) {
 832                                         if (*in == ':' || *in == '@' ||
 833                                             *in == '!')
 834                                                 local = NO;
 835                                         *ptr++ = *in++;
 836                                 }
 837                         }
 838                         *ptr = NULL;
 839                         if (*(in = nxtfld(in)))
 840                                 strncpy(date, in, sizeof date);
 841                         else {
 842                                 date[0] = '\n';
 843                                 date[1] = NULL;
 844                         }
 845                 }
 846                 else {
 847                         /*
 848                          * not the expected form
 849                          */
 850                         fseek(infile, 0L, 0);
 851                         return;
 852                 }
 853         }
 854         else
 855                 /*
 856                  * empty file ?
 857                  */
 858                 return;
 859
 860         /*
 861          * look for Subject line until EOF or a blank line
 862          */
 863         while (fgets(inbuf, sizeof inbuf, infile)
 864             && !(blankline = (inbuf[0] == '\n'))) {
 865                 /*
 866                  * extract Subject line
 867                  */
 868                 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
 869                         seensubj = YES;
 870                         frompos = ftell(infile);
 871                         strncpy(subj, nxtfld(inbuf), sizeof subj);
 872                 }
 873         }
 874         if (!blankline)
 875                 /*
 876                  * ran into EOF
 877                  */
 878                 fseek(infile, frompos, 0);
 879
 880         if (!seensubj)
 881                 /*
 882                  * for possible use with Mail
 883                  */
 884                 strncpy(subj, "(No Subject)\n", sizeof subj);
 885 }
 886
 887 char *
 888 nxtfld(unsigned char *s)
 889 {
 890         if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
 891         if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
 892         return (s);
 893 }