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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)msgs.c   8.2 (Berkeley) 4/28/95
  31  * $FreeBSD: src/usr.bin/msgs/msgs.c,v 1.15.2.2 2003/02/11 21:31:56 mike Exp $
  32  * $DragonFly: src/usr.bin/msgs/msgs.c,v 1.7 2007/11/25 18:10:07 swildner Exp $
  33  */
  34
  35 /*
  36  * msgs - a user bulletin board program
  37  *
  38  * usage:
  39  *      msgs [fhlopq] [[-]number]       to read messages
  40  *      msgs -s                         to place messages
  41  *      msgs -c [-days]                 to clean up the bulletin board
  42  *
  43  * prompt commands are:
  44  *      y       print message
  45  *      n       flush message, go to next message
  46  *      q       flush message, quit
  47  *      p       print message, turn on 'pipe thru more' mode
  48  *      P       print message, turn off 'pipe thru more' mode
  49  *      -       reprint last message
  50  *      s[-][<num>] [<filename>]        save message
  51  *      m[-][<num>]     mail with message in temp mbox
  52  *      x       exit without flushing this message
  53  *      <num>   print message number <num>
  54  */
  55
  56 #define V7              /* will look for TERM in the environment */
  57 #define OBJECT          /* will object to messages without Subjects */
  58 /* #define REJECT */    /* will reject messages without Subjects
  59                            (OBJECT must be defined also) */
  60 /* #define UNBUFFERED *//* use unbuffered output */
  61
  62 #include <sys/param.h>
  63 #include <sys/stat.h>
  64 #include <ctype.h>
  65 #include <dirent.h>
  66 #include <err.h>
  67 #include <errno.h>
  68 #include <fcntl.h>
  69 #include <locale.h>
  70 #include <pwd.h>
  71 #include <setjmp.h>
  72 #include <termcap.h>
  73 #include <termios.h>
  74 #include <signal.h>
  75 #include <stdio.h>
  76 #include <stdlib.h>
  77 #include <string.h>
  78 #include <time.h>
  79 #include <unistd.h>
  80 #include "pathnames.h"
  81
  82 #define CMODE   0644            /* bounds file creation mode */
  83 #define NO      0
  84 #define YES     1
  85 #define SUPERUSER       0       /* superuser uid */
  86 #define DAEMON          1       /* daemon uid */
  87 #define NLINES  24              /* default number of lines/crt screen */
  88 #define NDAYS   21              /* default keep time for messages */
  89 #define DAYS    *24*60*60       /* seconds/day */
  90 #define MSGSRC  ".msgsrc"       /* user's rc file */
  91 #define BOUNDS  "bounds"        /* message bounds file */
  92 #define NEXT    "Next message? [yq]"
  93 #define MORE    "More? [ynq]"
  94 #define NOMORE  "(No more) [q] ?"
  95
  96 typedef char    bool;
  97
  98 FILE    *msgsrc;
  99 FILE    *newmsg;
 100 const char *sep = "-";
 101 char    inbuf[BUFSIZ];
 102 char    fname[MAXPATHLEN];
 103 char    cmdbuf[MAXPATHLEN + MAXPATHLEN];
 104 char    subj[128];
 105 char    from[128];
 106 char    date[128];
 107 char    *ptr;
 108 char    *in;
 109 bool    local;
 110 bool    ruptible;
 111 bool    totty;
 112 bool    seenfrom;
 113 bool    seensubj;
 114 bool    blankline;
 115 bool    printing = NO;
 116 bool    mailing = NO;
 117 bool    quitit = NO;
 118 bool    sending = NO;
 119 bool    intrpflg = NO;
 120 int     uid;
 121 int     msg;
 122 int     prevmsg;
 123 int     lct;
 124 int     nlines;
 125 int     Lpp = 0;
 126 time_t  t;
 127 time_t  keep;
 128
 129 /* option initialization */
 130 bool    hdrs = NO;
 131 bool    qopt = NO;
 132 bool    hush = NO;
 133 bool    send_msg = NO;
 134 bool    locomode = NO;
 135 bool    use_pager = NO;
 136 bool    clean = NO;
 137 bool    lastcmd = NO;
 138 jmp_buf tstpbuf;
 139
 140
 141 void ask(const char *);
 142 void gfrsub(FILE *);
 143 int linecnt(FILE *);
 144 int next(char *);
 145 char *nxtfld(unsigned char *);
 146 void onsusp(int);
 147 void onintr(int);
 148 void prmesg(int);
 149 static void usage(void);
 150
 151 int
 152 main(int argc, char **argv)
 153 {
 154         bool newrc, already;
 155         int rcfirst = 0;                /* first message to print (from .rc) */
 156         int rcback = 0;                 /* amount to back off of rcfirst */
 157         int firstmsg = 0, nextmsg = 0, lastmsg = 0;
 158         int blast = 0;
 159         struct stat buf;                /* stat to check access of bounds */
 160         FILE *bounds;
 161
 162 #ifdef UNBUFFERED
 163         setbuf(stdout, NULL);
 164 #endif
 165         setlocale(LC_ALL, "");
 166
 167         time(&t);
 168         setuid(uid = getuid());
 169         ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
 170         if (ruptible)
 171                 signal(SIGINT, SIG_DFL);
 172
 173         argc--, argv++;
 174         while (argc > 0) {
 175                 if (isdigit(argv[0][0])) {      /* starting message # */
 176                         rcfirst = atoi(argv[0]);
 177                 }
 178                 else if (isdigit(argv[0][1])) { /* backward offset */
 179                         rcback = atoi( &( argv[0][1] ) );
 180                 }
 181                 else {
 182                         ptr = *argv;
 183                         while (*ptr) switch (*ptr++) {
 184
 185                         case '-':
 186                                 break;
 187
 188                         case 'c':
 189                                 if (uid != SUPERUSER && uid != DAEMON) {
 190                                         fprintf(stderr, "Sorry\n");
 191                                         exit(1);
 192                                 }
 193                                 clean = YES;
 194                                 break;
 195
 196                         case 'f':               /* silently */
 197                                 hush = YES;
 198                                 break;
 199
 200                         case 'h':               /* headers only */
 201                                 hdrs = YES;
 202                                 break;
 203
 204                         case 'l':               /* local msgs only */
 205                                 locomode = YES;
 206                                 break;
 207
 208                         case 'o':               /* option to save last message */
 209                                 lastcmd = YES;
 210                                 break;
 211
 212                         case 'p':               /* pipe thru 'more' during long msgs */
 213                                 use_pager = YES;
 214                                 break;
 215
 216                         case 'q':               /* query only */
 217                                 qopt = YES;
 218                                 break;
 219
 220                         case 's':               /* sending TO msgs */
 221                                 send_msg = YES;
 222                                 break;
 223
 224                         default:
 225                                 usage();
 226                         }
 227                 }
 228                 argc--, argv++;
 229         }
 230
 231         /*
 232          * determine current message bounds
 233          */
 234         snprintf(fname, sizeof(fname), "%s/%s", _PATH_MSGS, BOUNDS);
 235
 236         /*
 237          * Test access rights to the bounds file
 238          * This can be a little tricky.  if(send_msg), then
 239          * we will create it.  We assume that if(send_msg),
 240          * then you have write permission there.
 241          * Else, it better be there, or we bail.
 242          */
 243         if (send_msg != YES) {
 244                 if (stat(fname, &buf) < 0) {
 245                         if (hush != YES) {
 246                                 err(errno, "%s", fname);
 247                         } else {
 248                                 exit(1);
 249                         }
 250                 }
 251         }
 252         bounds = fopen(fname, "r");
 253
 254         if (bounds != NULL) {
 255                 fscanf(bounds, "%d %d\n", &firstmsg, &lastmsg);
 256                 fclose(bounds);
 257                 blast = lastmsg;        /* save upper bound */
 258         }
 259
 260         if (clean)
 261                 keep = t - (rcback? rcback : NDAYS) DAYS;
 262
 263         if (clean || bounds == NULL) {  /* relocate message bounds */
 264                 struct dirent *dp;
 265                 struct stat stbuf;
 266                 bool seenany = NO;
 267                 DIR     *dirp;
 268
 269                 dirp = opendir(_PATH_MSGS);
 270                 if (dirp == NULL)
 271                         err(errno, "%s", _PATH_MSGS);
 272
 273                 firstmsg = 32767;
 274                 lastmsg = 0;
 275
 276                 for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
 277                         char *cp = dp->d_name;
 278                         int i = 0;
 279
 280                         if (dp->d_ino == 0)
 281                                 continue;
 282
 283                         if (clean)
 284                                 snprintf(inbuf, sizeof(inbuf), "%s/%s", _PATH_MSGS, cp);
 285
 286                         while (isdigit(*cp))
 287                                 i = i * 10 + *cp++ - '0';
 288                         if (*cp)
 289                                 continue;       /* not a message! */
 290
 291                         if (clean) {
 292                                 if (stat(inbuf, &stbuf) != 0)
 293                                         continue;
 294                                 if (stbuf.st_mtime < keep
 295                                     && stbuf.st_mode&S_IWRITE) {
 296                                         unlink(inbuf);
 297                                         continue;
 298                                 }
 299                         }
 300
 301                         if (i > lastmsg)
 302                                 lastmsg = i;
 303                         if (i < firstmsg)
 304                                 firstmsg = i;
 305                         seenany = YES;
 306                 }
 307                 closedir(dirp);
 308
 309                 if (!seenany) {
 310                         if (blast != 0) /* never lower the upper bound! */
 311                                 lastmsg = blast;
 312                         firstmsg = lastmsg + 1;
 313                 }
 314                 else if (blast > lastmsg)
 315                         lastmsg = blast;
 316
 317                 if (!send_msg) {
 318                         bounds = fopen(fname, "w");
 319                         if (bounds == NULL)
 320                                 err(errno, "%s", fname);
 321                         chmod(fname, CMODE);
 322                         fprintf(bounds, "%d %d\n", firstmsg, lastmsg);
 323                         fclose(bounds);
 324                 }
 325         }
 326
 327         if (send_msg) {
 328                 /*
 329                  * Send mode - place msgs in _PATH_MSGS
 330                  */
 331                 bounds = fopen(fname, "w");
 332                 if (bounds == NULL)
 333                         err(errno, "%s", fname);
 334
 335                 nextmsg = lastmsg + 1;
 336                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, nextmsg);
 337                 newmsg = fopen(fname, "w");
 338                 if (newmsg == NULL)
 339                         err(errno, "%s", fname);
 340                 chmod(fname, CMODE);
 341
 342                 fprintf(bounds, "%d %d\n", firstmsg, nextmsg);
 343                 fclose(bounds);
 344
 345                 sending = YES;
 346                 if (ruptible)
 347                         signal(SIGINT, onintr);
 348
 349                 if (isatty(fileno(stdin))) {
 350                         ptr = getpwuid(uid)->pw_name;
 351                         printf("Message %d:\nFrom %s %sSubject: ",
 352                                 nextmsg, ptr, ctime(&t));
 353                         fflush(stdout);
 354                         fgets(inbuf, sizeof inbuf, stdin);
 355                         putchar('\n');
 356                         fflush(stdout);
 357                         fprintf(newmsg, "From %s %sSubject: %s\n",
 358                                 ptr, ctime(&t), inbuf);
 359                         blankline = seensubj = YES;
 360                 }
 361                 else
 362                         blankline = seensubj = NO;
 363                 for (;;) {
 364                         fgets(inbuf, sizeof inbuf, stdin);
 365                         if (feof(stdin) || ferror(stdin))
 366                                 break;
 367                         blankline = (blankline || (inbuf[0] == '\n'));
 368                         seensubj = (seensubj || (!blankline && (strncmp(inbuf, "Subj", 4) == 0)));
 369                         fputs(inbuf, newmsg);
 370                 }
 371 #ifdef OBJECT
 372                 if (!seensubj) {
 373                         printf("NOTICE: Messages should have a Subject field!\n");
 374 #ifdef REJECT
 375                         unlink(fname);
 376 #endif
 377                         exit(1);
 378                 }
 379 #endif
 380                 exit(ferror(stdin));
 381         }
 382         if (clean)
 383                 exit(0);
 384
 385         /*
 386          * prepare to display messages
 387          */
 388         totty = (isatty(fileno(stdout)) != 0);
 389         use_pager = use_pager && totty;
 390
 391         snprintf(fname, sizeof(fname), "%s/%s", getenv("HOME"), MSGSRC);
 392         msgsrc = fopen(fname, "r");
 393         if (msgsrc) {
 394                 newrc = NO;
 395                 fscanf(msgsrc, "%d\n", &nextmsg);
 396                 fclose(msgsrc);
 397                 if (nextmsg > lastmsg+1) {
 398                         printf("Warning: bounds have been reset (%d, %d)\n",
 399                                 firstmsg, lastmsg);
 400                         truncate(fname, (off_t)0);
 401                         newrc = YES;
 402                 }
 403                 else if (!rcfirst)
 404                         rcfirst = nextmsg - rcback;
 405         }
 406         else
 407                 newrc = YES;
 408         msgsrc = fopen(fname, "r+");
 409         if (msgsrc == NULL)
 410                 msgsrc = fopen(fname, "w");
 411         if (msgsrc == NULL)
 412                 err(errno, "%s", fname);
 413         if (rcfirst) {
 414                 if (rcfirst > lastmsg+1) {
 415                         printf("Warning: the last message is number %d.\n",
 416                                 lastmsg);
 417                         rcfirst = nextmsg;
 418                 }
 419                 if (rcfirst > firstmsg)
 420                         firstmsg = rcfirst;     /* don't set below first msg */
 421         }
 422         if (newrc) {
 423                 nextmsg = firstmsg;
 424                 fseek(msgsrc, 0L, 0);
 425                 fprintf(msgsrc, "%d\n", nextmsg);
 426                 fflush(msgsrc);
 427         }
 428
 429 #ifdef V7
 430         if (totty) {
 431                 struct winsize win;
 432                 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1)
 433                         Lpp = win.ws_row;
 434                 if (Lpp <= 0) {
 435                         if (tgetent(inbuf, getenv("TERM")) <= 0
 436                             || (Lpp = tgetnum("li")) <= 0) {
 437                                 Lpp = NLINES;
 438                         }
 439                 }
 440         }
 441 #endif
 442         Lpp -= 6;       /* for headers, etc. */
 443
 444         already = NO;
 445         prevmsg = firstmsg;
 446         printing = YES;
 447         if (ruptible)
 448                 signal(SIGINT, onintr);
 449
 450         /*
 451          * Main program loop
 452          */
 453         for (msg = firstmsg; msg <= lastmsg; msg++) {
 454
 455                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, msg);
 456                 newmsg = fopen(fname, "r");
 457                 if (newmsg == NULL)
 458                         continue;
 459
 460                 gfrsub(newmsg);         /* get From and Subject fields */
 461                 if (locomode && !local) {
 462                         fclose(newmsg);
 463                         continue;
 464                 }
 465
 466                 if (qopt) {     /* This has to be located here */
 467                         printf("There are new messages.\n");
 468                         exit(0);
 469                 }
 470
 471                 if (already && !hdrs)
 472                         putchar('\n');
 473
 474                 /*
 475                  * Print header
 476                  */
 477                 if (totty)
 478                         signal(SIGTSTP, onsusp);
 479                 (void) setjmp(tstpbuf);
 480                 already = YES;
 481                 nlines = 2;
 482                 if (seenfrom) {
 483                         printf("Message %d:\nFrom %s %s", msg, from, date);
 484                         nlines++;
 485                 }
 486                 if (seensubj) {
 487                         printf("Subject: %s", subj);
 488                         nlines++;
 489                 }
 490                 else {
 491                         if (seenfrom) {
 492                                 putchar('\n');
 493                                 nlines++;
 494                         }
 495                         while (nlines < 6
 496                             && fgets(inbuf, sizeof inbuf, newmsg)
 497                             && inbuf[0] != '\n') {
 498                                 fputs(inbuf, stdout);
 499                                 nlines++;
 500                         }
 501                 }
 502
 503                 lct = linecnt(newmsg);
 504                 if (lct)
 505                         printf("(%d%sline%s) ", lct, seensubj? " " : " more ",
 506                             (lct == 1) ? "" : "s");
 507
 508                 if (hdrs) {
 509                         printf("\n-----\n");
 510                         fclose(newmsg);
 511                         continue;
 512                 }
 513
 514                 /*
 515                  * Ask user for command
 516                  */
 517                 if (totty)
 518                         ask(lct? MORE : (msg==lastmsg? NOMORE : NEXT));
 519                 else
 520                         inbuf[0] = 'y';
 521                 if (totty)
 522                         signal(SIGTSTP, SIG_DFL);
 523 cmnd:
 524                 in = inbuf;
 525                 switch (*in) {
 526                         case 'x':
 527                         case 'X':
 528                                 exit(0);
 529
 530                         case 'q':
 531                         case 'Q':
 532                                 quitit = YES;
 533                                 printf("--Postponed--\n");
 534                                 exit(0);
 535                                 /* intentional fall-thru */
 536                         case 'n':
 537                         case 'N':
 538                                 if (msg >= nextmsg) sep = "Flushed";
 539                                 prevmsg = msg;
 540                                 break;
 541
 542                         case 'p':
 543                         case 'P':
 544                                 use_pager = (*in++ == 'p');
 545                                 /* intentional fallthru */
 546                         case '\n':
 547                         case 'y':
 548                         default:
 549                                 if (*in == '-') {
 550                                         msg = prevmsg-1;
 551                                         sep = "replay";
 552                                         break;
 553                                 }
 554                                 if (isdigit(*in)) {
 555                                         msg = next(in);
 556                                         sep = in;
 557                                         break;
 558                                 }
 559
 560                                 prmesg(nlines + lct + (seensubj? 1 : 0));
 561                                 prevmsg = msg;
 562
 563                 }
 564
 565                 printf("--%s--\n", sep);
 566                 sep = "-";
 567                 if (msg >= nextmsg) {
 568                         nextmsg = msg + 1;
 569                         fseek(msgsrc, 0L, 0);
 570                         fprintf(msgsrc, "%d\n", nextmsg);
 571                         fflush(msgsrc);
 572                 }
 573                 if (newmsg)
 574                         fclose(newmsg);
 575                 if (quitit)
 576                         break;
 577         }
 578
 579         /*
 580          * Make sure .rc file gets updated
 581          */
 582         if (--msg >= nextmsg) {
 583                 nextmsg = msg + 1;
 584                 fseek(msgsrc, 0L, 0);
 585                 fprintf(msgsrc, "%d\n", nextmsg);
 586                 fflush(msgsrc);
 587         }
 588         if (already && !quitit && lastcmd && totty) {
 589                 /*
 590                  * save or reply to last message?
 591                  */
 592                 msg = prevmsg;
 593                 ask(NOMORE);
 594                 if (inbuf[0] == '-' || isdigit(inbuf[0]))
 595                         goto cmnd;
 596         }
 597         if (!(already || hush || qopt))
 598                 printf("No new messages.\n");
 599         exit(0);
 600 }
 601
 602 static void
 603 usage(void)
 604 {
 605         fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
 606         exit(1);
 607 }
 608
 609 void
 610 prmesg(int length)
 611 {
 612         FILE *outf;
 613         char *env_pager;
 614
 615         if (use_pager && length > Lpp) {
 616                 signal(SIGPIPE, SIG_IGN);
 617                 signal(SIGQUIT, SIG_IGN);
 618                 if ((env_pager = getenv("PAGER")) == NULL) {
 619                         snprintf(cmdbuf, sizeof(cmdbuf), _PATH_PAGER, Lpp);
 620                 } else {
 621                         snprintf(cmdbuf, sizeof(cmdbuf), "%s", env_pager);
 622                 }
 623                 outf = popen(cmdbuf, "w");
 624                 if (!outf)
 625                         outf = stdout;
 626                 else
 627                         setbuf(outf, NULL);
 628         }
 629         else
 630                 outf = stdout;
 631
 632         if (seensubj)
 633                 putc('\n', outf);
 634
 635         while (fgets(inbuf, sizeof inbuf, newmsg)) {
 636                 fputs(inbuf, outf);
 637                 if (ferror(outf)) {
 638                         clearerr(outf);
 639                         break;
 640                 }
 641         }
 642
 643         if (outf != stdout) {
 644                 pclose(outf);
 645                 signal(SIGPIPE, SIG_DFL);
 646                 signal(SIGQUIT, SIG_DFL);
 647         }
 648         else {
 649                 fflush(stdout);
 650         }
 651
 652         /* force wait on output */
 653         tcdrain(fileno(stdout));
 654 }
 655
 656 void
 657 onintr(int unused __unused)
 658 {
 659         signal(SIGINT, onintr);
 660         if (mailing)
 661                 unlink(fname);
 662         if (sending) {
 663                 unlink(fname);
 664                 puts("--Killed--");
 665                 exit(1);
 666         }
 667         if (printing) {
 668                 putchar('\n');
 669                 if (hdrs)
 670                         exit(0);
 671                 sep = "Interrupt";
 672                 if (newmsg)
 673                         fseek(newmsg, 0L, 2);
 674                 intrpflg = YES;
 675         }
 676 }
 677
 678 /*
 679  * We have just gotten a susp.  Suspend and prepare to resume.
 680  */
 681 void
 682 onsusp(int unused __unused)
 683 {
 684         signal(SIGTSTP, SIG_DFL);
 685         sigsetmask(0);
 686         kill(0, SIGTSTP);
 687         signal(SIGTSTP, onsusp);
 688         if (!mailing)
 689                 longjmp(tstpbuf, 0);
 690 }
 691
 692 int
 693 linecnt(FILE *f)
 694 {
 695         off_t oldpos = ftell(f);
 696         int l = 0;
 697         char lbuf[BUFSIZ];
 698
 699         while (fgets(lbuf, sizeof lbuf, f))
 700                 l++;
 701         clearerr(f);
 702         fseek(f, oldpos, 0);
 703         return (l);
 704 }
 705
 706 int
 707 next(char *buf)
 708 {
 709         int i;
 710         sscanf(buf, "%d", &i);
 711         sprintf(buf, "Goto %d", i);
 712         return(--i);
 713 }
 714
 715 void
 716 ask(const char *prompt)
 717 {
 718         char    inch;
 719         int     n, cmsg, fd;
 720         off_t   oldpos;
 721         FILE    *cpfrom, *cpto;
 722
 723         printf("%s ", prompt);
 724         fflush(stdout);
 725         intrpflg = NO;
 726         (void) fgets(inbuf, sizeof inbuf, stdin);
 727         if ((n = strlen(inbuf)) > 0 && inbuf[n - 1] == '\n')
 728                 inbuf[n - 1] = '\0';
 729         if (intrpflg)
 730                 inbuf[0] = 'x';
 731
 732         /*
 733          * Handle 'mail' and 'save' here.
 734          */
 735         if ((inch = inbuf[0]) == 's' || inch == 'm') {
 736                 if (inbuf[1] == '-')
 737                         cmsg = prevmsg;
 738                 else if (isdigit(inbuf[1]))
 739                         cmsg = atoi(&inbuf[1]);
 740                 else
 741                         cmsg = msg;
 742                 snprintf(fname, sizeof(fname), "%s/%d", _PATH_MSGS, cmsg);
 743
 744                 oldpos = ftell(newmsg);
 745
 746                 cpfrom = fopen(fname, "r");
 747                 if (!cpfrom) {
 748                         printf("Message %d not found\n", cmsg);
 749                         ask (prompt);
 750                         return;
 751                 }
 752
 753                 if (inch == 's') {
 754                         in = nxtfld(inbuf);
 755                         if (*in) {
 756                                 for (n=0; in[n] > ' '; n++) { /* sizeof fname? */
 757                                         fname[n] = in[n];
 758                                 }
 759                                 fname[n] = '\0';
 760                         }
 761                         else
 762                                 strcpy(fname, "Messages");
 763                         fd = open(fname, O_RDWR|O_EXCL|O_CREAT|O_APPEND);
 764                 }
 765                 else {
 766                         strcpy(fname, _PATH_TMP);
 767                         fd = mkstemp(fname);
 768                         if (fd != -1) {
 769                                 snprintf(cmdbuf, sizeof(cmdbuf), _PATH_MAIL,
 770                                     fname);
 771                                 mailing = YES;
 772                         }
 773                 }
 774                 if (fd == -1 || (cpto = fdopen(fd, "a")) == NULL) {
 775                         if (fd != -1)
 776                                 close(fd);
 777                         warn("%s", fname);
 778                         mailing = NO;
 779                         fseek(newmsg, oldpos, 0);
 780                         ask(prompt);
 781                         return;
 782                 }
 783
 784                 while ((n = fread(inbuf, 1, sizeof inbuf, cpfrom)))
 785                         fwrite(inbuf, 1, n, cpto);
 786
 787                 fclose(cpfrom);
 788                 fclose(cpto);
 789                 fseek(newmsg, oldpos, 0);       /* reposition current message */
 790                 if (inch == 's')
 791                         printf("Message %d saved in \"%s\"\n", cmsg, fname);
 792                 else {
 793                         system(cmdbuf);
 794                         unlink(fname);
 795                         mailing = NO;
 796                 }
 797                 ask(prompt);
 798         }
 799 }
 800
 801 void
 802 gfrsub(FILE *infile)
 803 {
 804         off_t frompos;
 805         int count;
 806
 807         seensubj = seenfrom = NO;
 808         local = YES;
 809         subj[0] = from[0] = date[0] = '\0';
 810
 811         /*
 812          * Is this a normal message?
 813          */
 814         if (fgets(inbuf, sizeof inbuf, infile)) {
 815                 if (strncmp(inbuf, "From", 4)==0) {
 816                         /*
 817                          * expected form starts with From
 818                          */
 819                         seenfrom = YES;
 820                         frompos = ftell(infile);
 821                         ptr = from;
 822                         in = nxtfld(inbuf);
 823                         if (*in) {
 824                                 count = sizeof(from) - 1;
 825                                 while (*in && *in > ' ' && count-- > 0) {
 826                                         if (*in == ':' || *in == '@' ||
 827                                             *in == '!')
 828                                                 local = NO;
 829                                         *ptr++ = *in++;
 830                                 }
 831                         }
 832                         *ptr = '\0';
 833                         if (*(in = nxtfld(in)))
 834                                 strncpy(date, in, sizeof date);
 835                         else {
 836                                 date[0] = '\n';
 837                                 date[1] = '\0';
 838                         }
 839                 }
 840                 else {
 841                         /*
 842                          * not the expected form
 843                          */
 844                         fseek(infile, 0L, 0);
 845                         return;
 846                 }
 847         }
 848         else
 849                 /*
 850                  * empty file ?
 851                  */
 852                 return;
 853
 854         /*
 855          * look for Subject line until EOF or a blank line
 856          */
 857         while (fgets(inbuf, sizeof inbuf, infile)
 858             && !(blankline = (inbuf[0] == '\n'))) {
 859                 /*
 860                  * extract Subject line
 861                  */
 862                 if (!seensubj && strncmp(inbuf, "Subj", 4)==0) {
 863                         seensubj = YES;
 864                         frompos = ftell(infile);
 865                         strncpy(subj, nxtfld(inbuf), sizeof subj);
 866                 }
 867         }
 868         if (!blankline)
 869                 /*
 870                  * ran into EOF
 871                  */
 872                 fseek(infile, frompos, 0);
 873
 874         if (!seensubj)
 875                 /*
 876                  * for possible use with Mail
 877                  */
 878                 strncpy(subj, "(No Subject)\n", sizeof subj);
 879 }
 880
 881 char *
 882 nxtfld(unsigned char *s)
 883 {
 884         if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
 885         if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
 886         return (s);
 887 }