usr.bin/mail/collect.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  * 4. 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
  30 #ifndef lint
  31 #if 0
  32 static char sccsid[] = "@(#)collect.c   8.2 (Berkeley) 4/19/94";
  33 #endif
  34 #endif /* not lint */
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 /*
  39  * Mail -- a mail program
  40  *
  41  * Collect input from standard input, handling
  42  * ~ escapes.
  43  */
  44
  45 #include "rcv.h"
  46 #include <fcntl.h>
  47 #include "extern.h"
  48
  49 /*
  50  * Read a message from standard output and return a read file to it
  51  * or NULL on error.
  52  */
  53
  54 /*
  55  * The following hokiness with global variables is so that on
  56  * receipt of an interrupt signal, the partial message can be salted
  57  * away on dead.letter.
  58  */
  59
  60 static  sig_t   saveint;                /* Previous SIGINT value */
  61 static  sig_t   savehup;                /* Previous SIGHUP value */
  62 static  sig_t   savetstp;               /* Previous SIGTSTP value */
  63 static  sig_t   savettou;               /* Previous SIGTTOU value */
  64 static  sig_t   savettin;               /* Previous SIGTTIN value */
  65 static  FILE    *collf;                 /* File for saving away */
  66 static  int     hadintr;                /* Have seen one SIGINT so far */
  67
  68 static  jmp_buf colljmp;                /* To get back to work */
  69 static  int     colljmp_p;              /* whether to long jump */
  70 static  jmp_buf collabort;              /* To end collection with error */
  71
  72 FILE *
  73 collect(struct header *hp, int printheaders)
  74 {
  75         FILE *fbuf;
  76         int lc, cc, escape, eofcount, fd, c, t;
  77         char linebuf[LINESIZE], tempname[PATHSIZE], *cp, getsub;
  78         sigset_t nset;
  79         int longline, lastlong, rc;     /* So we don't make 2 or more lines
  80                                            out of a long input line. */
  81
  82         collf = NULL;
  83         /*
  84          * Start catching signals from here, but we're still die on interrupts
  85          * until we're in the main loop.
  86          */
  87         (void)sigemptyset(&nset);
  88         (void)sigaddset(&nset, SIGINT);
  89         (void)sigaddset(&nset, SIGHUP);
  90         (void)sigprocmask(SIG_BLOCK, &nset, NULL);
  91         if ((saveint = signal(SIGINT, SIG_IGN)) != SIG_IGN)
  92                 (void)signal(SIGINT, collint);
  93         if ((savehup = signal(SIGHUP, SIG_IGN)) != SIG_IGN)
  94                 (void)signal(SIGHUP, collhup);
  95         savetstp = signal(SIGTSTP, collstop);
  96         savettou = signal(SIGTTOU, collstop);
  97         savettin = signal(SIGTTIN, collstop);
  98         if (setjmp(collabort) || setjmp(colljmp)) {
  99                 (void)rm(tempname);
 100                 goto err;
 101         }
 102         (void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
 103
 104         noreset++;
 105         (void)snprintf(tempname, sizeof(tempname),
 106             "%s/mail.RsXXXXXXXXXX", tmpdir);
 107         if ((fd = mkstemp(tempname)) == -1 ||
 108             (collf = Fdopen(fd, "w+")) == NULL) {
 109                 warn("%s", tempname);
 110                 goto err;
 111         }
 112         (void)rm(tempname);
 113
 114         /*
 115          * If we are going to prompt for a subject,
 116          * refrain from printing a newline after
 117          * the headers (since some people mind).
 118          */
 119         t = GTO|GSUBJECT|GCC|GNL;
 120         getsub = 0;
 121         if (hp->h_subject == NULL && value("interactive") != NULL &&
 122             (value("ask") != NULL || value("asksub") != NULL))
 123                 t &= ~GNL, getsub++;
 124         if (printheaders) {
 125                 puthead(hp, stdout, t);
 126                 (void)fflush(stdout);
 127         }
 128         if ((cp = value("escape")) != NULL)
 129                 escape = *cp;
 130         else
 131                 escape = ESCAPE;
 132         eofcount = 0;
 133         hadintr = 0;
 134         lastlong = 0;
 135         longline = 0;
 136
 137         if (!setjmp(colljmp)) {
 138                 if (getsub)
 139                         grabh(hp, GSUBJECT);
 140         } else {
 141                 /*
 142                  * Come here for printing the after-signal message.
 143                  * Duplicate messages won't be printed because
 144                  * the write is aborted if we get a SIGTTOU.
 145                  */
 146 cont:
 147                 if (hadintr) {
 148                         (void)fflush(stdout);
 149                         fprintf(stderr,
 150                         "\n(Interrupt -- one more to kill letter)\n");
 151                 } else {
 152                         printf("(continue)\n");
 153                         (void)fflush(stdout);
 154                 }
 155         }
 156         for (;;) {
 157                 colljmp_p = 1;
 158                 c = readline(stdin, linebuf, LINESIZE);
 159                 colljmp_p = 0;
 160                 if (c < 0) {
 161                         if (value("interactive") != NULL &&
 162                             value("ignoreeof") != NULL && ++eofcount < 25) {
 163                                 printf("Use \".\" to terminate letter\n");
 164                                 continue;
 165                         }
 166                         break;
 167                 }
 168                 lastlong = longline;
 169                 longline = c == LINESIZE - 1;
 170                 eofcount = 0;
 171                 hadintr = 0;
 172                 if (linebuf[0] == '.' && linebuf[1] == '\0' &&
 173                     value("interactive") != NULL && !lastlong &&
 174                     (value("dot") != NULL || value("ignoreeof") != NULL))
 175                         break;
 176                 if (linebuf[0] != escape || value("interactive") == NULL ||
 177                     lastlong) {
 178                         if (putline(collf, linebuf, !longline) < 0)
 179                                 goto err;
 180                         continue;
 181                 }
 182                 c = linebuf[1];
 183                 switch (c) {
 184                 default:
 185                         /*
 186                          * On double escape, just send the single one.
 187                          * Otherwise, it's an error.
 188                          */
 189                         if (c == escape) {
 190                                 if (putline(collf, &linebuf[1], !longline) < 0)
 191                                         goto err;
 192                                 else
 193                                         break;
 194                         }
 195                         printf("Unknown tilde escape.\n");
 196                         break;
 197                 case 'C':
 198                         /*
 199                          * Dump core.
 200                          */
 201                         core();
 202                         break;
 203                 case '!':
 204                         /*
 205                          * Shell escape, send the balance of the
 206                          * line to sh -c.
 207                          */
 208                         shell(&linebuf[2]);
 209                         break;
 210                 case ':':
 211                 case '_':
 212                         /*
 213                          * Escape to command mode, but be nice!
 214                          */
 215                         execute(&linebuf[2], 1);
 216                         goto cont;
 217                 case '.':
 218                         /*
 219                          * Simulate end of file on input.
 220                          */
 221                         goto out;
 222                 case 'q':
 223                         /*
 224                          * Force a quit of sending mail.
 225                          * Act like an interrupt happened.
 226                          */
 227                         hadintr++;
 228                         collint(SIGINT);
 229                         exit(1);
 230                 case 'x':
 231                         /*
 232                          * Exit, do not save in dead.letter.
 233                          */
 234                         goto err;
 235                 case 'h':
 236                         /*
 237                          * Grab a bunch of headers.
 238                          */
 239                         grabh(hp, GTO|GSUBJECT|GCC|GBCC);
 240                         goto cont;
 241                 case 't':
 242                         /*
 243                          * Add to the To list.
 244                          */
 245                         hp->h_to = cat(hp->h_to, extract(&linebuf[2], GTO));
 246                         break;
 247                 case 's':
 248                         /*
 249                          * Set the Subject line.
 250                          */
 251                         cp = &linebuf[2];
 252                         while (isspace((unsigned char)*cp))
 253                                 cp++;
 254                         hp->h_subject = savestr(cp);
 255                         break;
 256                 case 'R':
 257                         /*
 258                          * Set the Reply-To line.
 259                          */
 260                         cp = &linebuf[2];
 261                         while (isspace((unsigned char)*cp))
 262                                 cp++;
 263                         hp->h_replyto = savestr(cp);
 264                         break;
 265                 case 'c':
 266                         /*
 267                          * Add to the CC list.
 268                          */
 269                         hp->h_cc = cat(hp->h_cc, extract(&linebuf[2], GCC));
 270                         break;
 271                 case 'b':
 272                         /*
 273                          * Add to the BCC list.
 274                          */
 275                         hp->h_bcc = cat(hp->h_bcc, extract(&linebuf[2], GBCC));
 276                         break;
 277                 case 'i':
 278                 case 'A':
 279                 case 'a':
 280                         /*
 281                          * Insert named variable in message.
 282                          */
 283                         switch(c) {
 284                                 case 'i':
 285                                         cp = &linebuf[2];
 286                                         while(isspace((unsigned char)*cp))
 287                                                 cp++;
 288                                         break;
 289                                 case 'a':
 290                                         cp = "sign";
 291                                         break;
 292                                 case 'A':
 293                                         cp = "Sign";
 294                                         break;
 295                                 default:
 296                                         goto err;
 297                         }
 298
 299                         if(*cp != '\0' && (cp = value(cp)) != NULL) {
 300                                 printf("%s\n", cp);
 301                                 if(putline(collf, cp, 1) < 0)
 302                                         goto err;
 303                         }
 304
 305                         break;
 306                 case 'd':
 307                         /*
 308                          * Read in the dead letter file.
 309                          */
 310                         if (strlcpy(linebuf + 2, getdeadletter(),
 311                                 sizeof(linebuf) - 2)
 312                             >= sizeof(linebuf) - 2) {
 313                                 printf("Line buffer overflow\n");
 314                                 break;
 315                         }
 316                         /* FALLTHROUGH */
 317                 case 'r':
 318                 case '<':
 319                         /*
 320                          * Invoke a file:
 321                          * Search for the file name,
 322                          * then open it and copy the contents to collf.
 323                          */
 324                         cp = &linebuf[2];
 325                         while (isspace((unsigned char)*cp))
 326                                 cp++;
 327                         if (*cp == '\0') {
 328                                 printf("Interpolate what file?\n");
 329                                 break;
 330                         }
 331                         cp = expand(cp);
 332                         if (cp == NULL)
 333                                 break;
 334                         if (*cp == '!') {
 335                                 /*
 336                                  * Insert stdout of command.
 337                                  */
 338                                 char *sh;
 339                                 int nullfd, tempfd, rc;
 340                                 char tempname2[PATHSIZE];
 341
 342                                 if ((nullfd = open("/dev/null", O_RDONLY, 0))
 343                                     == -1) {
 344                                         warn("/dev/null");
 345                                         break;
 346                                 }
 347
 348                                 (void)snprintf(tempname2, sizeof(tempname2),
 349                                     "%s/mail.ReXXXXXXXXXX", tmpdir);
 350                                 if ((tempfd = mkstemp(tempname2)) == -1 ||
 351                                     (fbuf = Fdopen(tempfd, "w+")) == NULL) {
 352                                         warn("%s", tempname2);
 353                                         break;
 354                                 }
 355                                 (void)unlink(tempname2);
 356
 357                                 if ((sh = value("SHELL")) == NULL)
 358                                         sh = _PATH_CSHELL;
 359
 360                                 rc = run_command(sh, 0, nullfd, fileno(fbuf),
 361                                     "-c", cp+1, NULL);
 362
 363                                 close(nullfd);
 364
 365                                 if (rc < 0) {
 366                                         (void)Fclose(fbuf);
 367                                         break;
 368                                 }
 369
 370                                 if (fsize(fbuf) == 0) {
 371                                         fprintf(stderr,
 372                                             "No bytes from command \"%s\"\n",
 373                                             cp+1);
 374                                         (void)Fclose(fbuf);
 375                                         break;
 376                                 }
 377
 378                                 rewind(fbuf);
 379                         } else if (isdir(cp)) {
 380                                 printf("%s: Directory\n", cp);
 381                                 break;
 382                         } else if ((fbuf = Fopen(cp, "r")) == NULL) {
 383                                 warn("%s", cp);
 384                                 break;
 385                         }
 386                         printf("\"%s\" ", cp);
 387                         (void)fflush(stdout);
 388                         lc = 0;
 389                         cc = 0;
 390                         while ((rc = readline(fbuf, linebuf, LINESIZE)) >= 0) {
 391                                 if (rc != LINESIZE - 1)
 392                                         lc++;
 393                                 if ((t = putline(collf, linebuf,
 394                                          rc != LINESIZE - 1)) < 0) {
 395                                         (void)Fclose(fbuf);
 396                                         goto err;
 397                                 }
 398                                 cc += t;
 399                         }
 400                         (void)Fclose(fbuf);
 401                         printf("%d/%d\n", lc, cc);
 402                         break;
 403                 case 'w':
 404                         /*
 405                          * Write the message on a file.
 406                          */
 407                         cp = &linebuf[2];
 408                         while (*cp == ' ' || *cp == '\t')
 409                                 cp++;
 410                         if (*cp == '\0') {
 411                                 fprintf(stderr, "Write what file!?\n");
 412                                 break;
 413                         }
 414                         if ((cp = expand(cp)) == NULL)
 415                                 break;
 416                         rewind(collf);
 417                         exwrite(cp, collf, 1);
 418                         break;
 419                 case 'm':
 420                 case 'M':
 421                 case 'f':
 422                 case 'F':
 423                         /*
 424                          * Interpolate the named messages, if we
 425                          * are in receiving mail mode.  Does the
 426                          * standard list processing garbage.
 427                          * If ~f is given, we don't shift over.
 428                          */
 429                         if (forward(linebuf + 2, collf, tempname, c) < 0)
 430                                 goto err;
 431                         goto cont;
 432                 case '?':
 433                         if ((fbuf = Fopen(_PATH_TILDE, "r")) == NULL) {
 434                                 warn("%s", _PATH_TILDE);
 435                                 break;
 436                         }
 437                         while ((t = getc(fbuf)) != EOF)
 438                                 (void)putchar(t);
 439                         (void)Fclose(fbuf);
 440                         break;
 441                 case 'p':
 442                         /*
 443                          * Print out the current state of the
 444                          * message without altering anything.
 445                          */
 446                         rewind(collf);
 447                         printf("-------\nMessage contains:\n");
 448                         puthead(hp, stdout, GTO|GSUBJECT|GCC|GBCC|GNL);
 449                         while ((t = getc(collf)) != EOF)
 450                                 (void)putchar(t);
 451                         goto cont;
 452                 case '|':
 453                         /*
 454                          * Pipe message through command.
 455                          * Collect output as new message.
 456                          */
 457                         rewind(collf);
 458                         mespipe(collf, &linebuf[2]);
 459                         goto cont;
 460                 case 'v':
 461                 case 'e':
 462                         /*
 463                          * Edit the current message.
 464                          * 'e' means to use EDITOR
 465                          * 'v' means to use VISUAL
 466                          */
 467                         rewind(collf);
 468                         mesedit(collf, c);
 469                         goto cont;
 470                 }
 471         }
 472         goto out;
 473 err:
 474         if (collf != NULL) {
 475                 (void)Fclose(collf);
 476                 collf = NULL;
 477         }
 478 out:
 479         if (collf != NULL)
 480                 rewind(collf);
 481         noreset--;
 482         (void)sigprocmask(SIG_BLOCK, &nset, NULL);
 483         (void)signal(SIGINT, saveint);
 484         (void)signal(SIGHUP, savehup);
 485         (void)signal(SIGTSTP, savetstp);
 486         (void)signal(SIGTTOU, savettou);
 487         (void)signal(SIGTTIN, savettin);
 488         (void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
 489         return (collf);
 490 }
 491
 492 /*
 493  * Write a file, ex-like if f set.
 494  */
 495 int
 496 exwrite(char name[], FILE *fp, int f)
 497 {
 498         FILE *of;
 499         int c, lc;
 500         long cc;
 501         struct stat junk;
 502
 503         if (f) {
 504                 printf("\"%s\" ", name);
 505                 (void)fflush(stdout);
 506         }
 507         if (stat(name, &junk) >= 0 && S_ISREG(junk.st_mode)) {
 508                 if (!f)
 509                         fprintf(stderr, "%s: ", name);
 510                 fprintf(stderr, "File exists\n");
 511                 return (-1);
 512         }
 513         if ((of = Fopen(name, "w")) == NULL) {
 514                 warn((char *)NULL);
 515                 return (-1);
 516         }
 517         lc = 0;
 518         cc = 0;
 519         while ((c = getc(fp)) != EOF) {
 520                 cc++;
 521                 if (c == '\n')
 522                         lc++;
 523                 (void)putc(c, of);
 524                 if (ferror(of)) {
 525                         warnx("%s", name);
 526                         (void)Fclose(of);
 527                         return (-1);
 528                 }
 529         }
 530         (void)Fclose(of);
 531         printf("%d/%ld\n", lc, cc);
 532         (void)fflush(stdout);
 533         return (0);
 534 }
 535
 536 /*
 537  * Edit the message being collected on fp.
 538  * On return, make the edit file the new temp file.
 539  */
 540 void
 541 mesedit(FILE *fp, int c)
 542 {
 543         sig_t sigint = signal(SIGINT, SIG_IGN);
 544         FILE *nf = run_editor(fp, (off_t)-1, c, 0);
 545
 546         if (nf != NULL) {
 547                 (void)fseeko(nf, (off_t)0, SEEK_END);
 548                 collf = nf;
 549                 (void)Fclose(fp);
 550         }
 551         (void)signal(SIGINT, sigint);
 552 }
 553
 554 /*
 555  * Pipe the message through the command.
 556  * Old message is on stdin of command;
 557  * New message collected from stdout.
 558  * Sh -c must return 0 to accept the new message.
 559  */
 560 void
 561 mespipe(FILE *fp, char cmd[])
 562 {
 563         FILE *nf;
 564         int fd;
 565         sig_t sigint = signal(SIGINT, SIG_IGN);
 566         char *sh, tempname[PATHSIZE];
 567
 568         (void)snprintf(tempname, sizeof(tempname),
 569             "%s/mail.ReXXXXXXXXXX", tmpdir);
 570         if ((fd = mkstemp(tempname)) == -1 ||
 571             (nf = Fdopen(fd, "w+")) == NULL) {
 572                 warn("%s", tempname);
 573                 goto out;
 574         }
 575         (void)rm(tempname);
 576         /*
 577          * stdin = current message.
 578          * stdout = new message.
 579          */
 580         if ((sh = value("SHELL")) == NULL)
 581                 sh = _PATH_CSHELL;
 582         if (run_command(sh,
 583             0, fileno(fp), fileno(nf), "-c", cmd, NULL) < 0) {
 584                 (void)Fclose(nf);
 585                 goto out;
 586         }
 587         if (fsize(nf) == 0) {
 588                 fprintf(stderr, "No bytes from \"%s\" !?\n", cmd);
 589                 (void)Fclose(nf);
 590                 goto out;
 591         }
 592         /*
 593          * Take new files.
 594          */
 595         (void)fseeko(nf, (off_t)0, SEEK_END);
 596         collf = nf;
 597         (void)Fclose(fp);
 598 out:
 599         (void)signal(SIGINT, sigint);
 600 }
 601
 602 /*
 603  * Interpolate the named messages into the current
 604  * message, preceding each line with a tab.
 605  * Return a count of the number of characters now in
 606  * the message, or -1 if an error is encountered writing
 607  * the message temporary.  The flag argument is 'm' if we
 608  * should shift over and 'f' if not.
 609  */
 610 int
 611 forward(char ms[], FILE *fp, char *fn, int f)
 612 {
 613         int *msgvec;
 614         struct ignoretab *ig;
 615         char *tabst;
 616
 617         msgvec = (int *)salloc((msgCount+1) * sizeof(*msgvec));
 618         if (msgvec == NULL)
 619                 return (0);
 620         if (getmsglist(ms, msgvec, 0) < 0)
 621                 return (0);
 622         if (*msgvec == 0) {
 623                 *msgvec = first(0, MMNORM);
 624                 if (*msgvec == 0) {
 625                         printf("No appropriate messages\n");
 626                         return (0);
 627                 }
 628                 msgvec[1] = 0;
 629         }
 630         if (f == 'f' || f == 'F')
 631                 tabst = NULL;
 632         else if ((tabst = value("indentprefix")) == NULL)
 633                 tabst = "\t";
 634         ig = isupper((unsigned char)f) ? NULL : ignore;
 635         printf("Interpolating:");
 636         for (; *msgvec != 0; msgvec++) {
 637                 struct message *mp = message + *msgvec - 1;
 638
 639                 touch(mp);
 640                 printf(" %d", *msgvec);
 641                 if (sendmessage(mp, fp, ig, tabst) < 0) {
 642                         warnx("%s", fn);
 643                         return (-1);
 644                 }
 645         }
 646         printf("\n");
 647         return (0);
 648 }
 649
 650 /*
 651  * Print (continue) when continued after ^Z.
 652  */
 653 /*ARGSUSED*/
 654 void
 655 collstop(int s)
 656 {
 657         sig_t old_action = signal(s, SIG_DFL);
 658         sigset_t nset;
 659
 660         (void)sigemptyset(&nset);
 661         (void)sigaddset(&nset, s);
 662         (void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
 663         (void)kill(0, s);
 664         (void)sigprocmask(SIG_BLOCK, &nset, NULL);
 665         (void)signal(s, old_action);
 666         if (colljmp_p) {
 667                 colljmp_p = 0;
 668                 hadintr = 0;
 669                 longjmp(colljmp, 1);
 670         }
 671 }
 672
 673 /*
 674  * On interrupt, come here to save the partial message in ~/dead.letter.
 675  * Then jump out of the collection loop.
 676  */
 677 /*ARGSUSED*/
 678 void
 679 collint(int s __unused)
 680 {
 681         /*
 682          * the control flow is subtle, because we can be called from ~q.
 683          */
 684         if (!hadintr) {
 685                 if (value("ignore") != NULL) {
 686                         printf("@");
 687                         (void)fflush(stdout);
 688                         clearerr(stdin);
 689                         return;
 690                 }
 691                 hadintr = 1;
 692                 longjmp(colljmp, 1);
 693         }
 694         rewind(collf);
 695         if (value("nosave") == NULL)
 696                 savedeadletter(collf);
 697         longjmp(collabort, 1);
 698 }
 699
 700 /*ARGSUSED*/
 701 void
 702 collhup(int s __unused)
 703 {
 704         rewind(collf);
 705         savedeadletter(collf);
 706         /*
 707          * Let's pretend nobody else wants to clean up,
 708          * a true statement at this time.
 709          */
 710         exit(1);
 711 }
 712
 713 void
 714 savedeadletter(FILE *fp)
 715 {
 716         FILE *dbuf;
 717         int c;
 718         char *cp;
 719
 720         if (fsize(fp) == 0)
 721                 return;
 722         cp = getdeadletter();
 723         c = umask(077);
 724         dbuf = Fopen(cp, "a");
 725         (void)umask(c);
 726         if (dbuf == NULL)
 727                 return;
 728         while ((c = getc(fp)) != EOF)
 729                 (void)putc(c, dbuf);
 730         (void)Fclose(dbuf);
 731         rewind(fp);
 732 }