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