usr.bin/mail/collect.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #ifndef lint
  33 #if 0
  34 static char sccsid[] = "@(#)collect.c   8.2 (Berkeley) 4/19/94";
  35 #endif
  36 #endif /* not lint */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD$");
  39
  40 /*
  41  * Mail -- a mail program
  42  *
  43  * Collect input from standard input, handling
  44  * ~ escapes.
  45  */
  46
  47 #include "rcv.h"
  48 #include <fcntl.h>
  49 #include "extern.h"
  50
  51 /*
  52  * Read a message from standard input and return a read file to it
  53  * or NULL on error.
  54  */
  55
  56 /*
  57  * The following hokiness with global variables is so that on
  58  * receipt of an interrupt signal, the partial message can be salted
  59  * away on dead.letter.
  60  */
  61
  62 static  sig_t   saveint;                /* Previous SIGINT value */
  63 static  sig_t   savehup;                /* Previous SIGHUP value */
  64 static  sig_t   savetstp;               /* Previous SIGTSTP value */
  65 static  sig_t   savettou;               /* Previous SIGTTOU value */
  66 static  sig_t   savettin;               /* Previous SIGTTIN value */
  67 static  FILE    *collf;                 /* File for saving away */
  68 static  int     hadintr;                /* Have seen one SIGINT so far */
  69
  70 static  jmp_buf colljmp;                /* To get back to work */
  71 static  int     colljmp_p;              /* whether to long jump */
  72 static  jmp_buf collabort;              /* To end collection with error */
  73
  74 FILE *
  75 collect(struct header *hp, int printheaders)
  76 {
  77         FILE *fbuf;
  78         int lc, cc, escape, eofcount, fd, c, t;
  79         char linebuf[LINESIZE], tempname[PATHSIZE], *cp, getsub;
  80         sigset_t nset;
  81         int longline, lastlong, rc;     /* So we don't make 2 or more lines
  82                                            out of a long input line. */
  83
  84         collf = NULL;
  85         /*
  86          * Start catching signals from here, but we're still die on interrupts
  87          * until we're in the main loop.
  88          */
  89         (void)sigemptyset(&nset);
  90         (void)sigaddset(&nset, SIGINT);
  91         (void)sigaddset(&nset, SIGHUP);
  92         (void)sigprocmask(SIG_BLOCK, &nset, NULL);
  93         if ((saveint = signal(SIGINT, SIG_IGN)) != SIG_IGN)
  94                 (void)signal(SIGINT, collint);
  95         if ((savehup = signal(SIGHUP, SIG_IGN)) != SIG_IGN)
  96                 (void)signal(SIGHUP, collhup);
  97         savetstp = signal(SIGTSTP, collstop);
  98         savettou = signal(SIGTTOU, collstop);
  99         savettin = signal(SIGTTIN, collstop);
 100         if (setjmp(collabort) || setjmp(colljmp)) {
 101                 (void)rm(tempname);
 102                 goto err;
 103         }
 104         (void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
 105
 106         noreset++;
 107         (void)snprintf(tempname, sizeof(tempname),
 108             "%s/mail.RsXXXXXXXXXX", tmpdir);
 109         if ((fd = mkstemp(tempname)) == -1 ||
 110             (collf = Fdopen(fd, "w+")) == NULL) {
 111                 warn("%s", tempname);
 112                 goto err;
 113         }
 114         (void)rm(tempname);
 115
 116         /*
 117          * If we are going to prompt for a subject,
 118          * refrain from printing a newline after
 119          * the headers (since some people mind).
 120          */
 121         t = GTO|GSUBJECT|GCC|GNL;
 122         getsub = 0;
 123         if (hp->h_subject == NULL && value("interactive") != NULL &&
 124             (value("ask") != NULL || value("asksub") != NULL))
 125                 t &= ~GNL, getsub++;
 126         if (printheaders) {
 127                 puthead(hp, stdout, t);
 128                 (void)fflush(stdout);
 129         }
 130         if ((cp = value("escape")) != NULL)
 131                 escape = *cp;
 132         else
 133                 escape = ESCAPE;
 134         eofcount = 0;
 135         hadintr = 0;
 136         longline = 0;
 137
 138         if (!setjmp(colljmp)) {
 139                 if (getsub)
 140                         grabh(hp, GSUBJECT);
 141         } else {
 142                 /*
 143                  * Come here for printing the after-signal message.
 144                  * Duplicate messages won't be printed because
 145                  * the write is aborted if we get a SIGTTOU.
 146                  */
 147 cont:
 148                 if (hadintr) {
 149                         (void)fflush(stdout);
 150                         fprintf(stderr,
 151                         "\n(Interrupt -- one more to kill letter)\n");
 152                 } else {
 153                         printf("(continue)\n");
 154                         (void)fflush(stdout);
 155                 }
 156         }
 157         for (;;) {
 158                 colljmp_p = 1;
 159                 c = readline(stdin, linebuf, LINESIZE);
 160                 colljmp_p = 0;
 161                 if (c < 0) {
 162                         if (value("interactive") != NULL &&
 163                             value("ignoreeof") != NULL && ++eofcount < 25) {
 164                                 printf("Use \".\" to terminate letter\n");
 165                                 continue;
 166                         }
 167                         break;
 168                 }
 169                 lastlong = longline;
 170                 longline = c == LINESIZE - 1;
 171                 eofcount = 0;
 172                 hadintr = 0;
 173                 if (linebuf[0] == '.' && linebuf[1] == '\0' &&
 174                     value("interactive") != NULL && !lastlong &&
 175                     (value("dot") != NULL || value("ignoreeof") != NULL))
 176                         break;
 177                 if (linebuf[0] != escape || value("interactive") == NULL ||
 178                     lastlong) {
 179                         if (putline(collf, linebuf, !longline) < 0)
 180                                 goto err;
 181                         continue;
 182                 }
 183                 c = linebuf[1];
 184                 switch (c) {
 185                 default:
 186                         /*
 187                          * On double escape, just send the single one.
 188                          * Otherwise, it's an error.
 189                          */
 190                         if (c == escape) {
 191                                 if (putline(collf, &linebuf[1], !longline) < 0)
 192                                         goto err;
 193                                 else
 194                                         break;
 195                         }
 196                         printf("Unknown tilde escape.\n");
 197                         break;
 198                 case 'C':
 199                         /*
 200                          * Dump core.
 201                          */
 202                         core();
 203                         break;
 204                 case '!':
 205                         /*
 206                          * Shell escape, send the balance of the
 207                          * line to sh -c.
 208                          */
 209                         shell(&linebuf[2]);
 210                         break;
 211                 case ':':
 212                 case '_':
 213                         /*
 214                          * Escape to command mode, but be nice!
 215                          */
 216                         execute(&linebuf[2], 1);
 217                         goto cont;
 218                 case '.':
 219                         /*
 220                          * Simulate end of file on input.
 221                          */
 222                         goto out;
 223                 case 'q':
 224                         /*
 225                          * Force a quit of sending mail.
 226                          * Act like an interrupt happened.
 227                          */
 228                         hadintr++;
 229                         collint(SIGINT);
 230                         exit(1);
 231                 case 'x':
 232                         /*
 233                          * Exit, do not save in dead.letter.
 234                          */
 235                         goto err;
 236                 case 'h':
 237                         /*
 238                          * Grab a bunch of headers.
 239                          */
 240                         grabh(hp, GTO|GSUBJECT|GCC|GBCC);
 241                         goto cont;
 242                 case 't':
 243                         /*
 244                          * Add to the To list.
 245                          */
 246                         hp->h_to = cat(hp->h_to, extract(&linebuf[2], GTO));
 247                         break;
 248                 case 's':
 249                         /*
 250                          * Set the Subject line.
 251                          */
 252                         cp = &linebuf[2];
 253                         while (isspace((unsigned char)*cp))
 254                                 cp++;
 255                         hp->h_subject = savestr(cp);
 256                         break;
 257                 case 'R':
 258                         /*
 259                          * Set the Reply-To line.
 260                          */
 261                         cp = &linebuf[2];
 262                         while (isspace((unsigned char)*cp))
 263                                 cp++;
 264                         hp->h_replyto = savestr(cp);
 265                         break;
 266                 case 'c':
 267                         /*
 268                          * Add to the CC list.
 269                          */
 270                         hp->h_cc = cat(hp->h_cc, extract(&linebuf[2], GCC));
 271                         break;
 272                 case 'b':
 273                         /*
 274                          * Add to the BCC list.
 275                          */
 276                         hp->h_bcc = cat(hp->h_bcc, extract(&linebuf[2], GBCC));
 277                         break;
 278                 case 'i':
 279                 case 'A':
 280                 case 'a':
 281                         /*
 282                          * Insert named variable in message.
 283                          */
 284                         switch(c) {
 285                                 case 'i':
 286                                         cp = &linebuf[2];
 287                                         while(isspace((unsigned char)*cp))
 288                                                 cp++;
 289                                         break;
 290                                 case 'a':
 291                                         cp = "sign";
 292                                         break;
 293                                 case 'A':
 294                                         cp = "Sign";
 295                                         break;
 296                                 default:
 297                                         goto err;
 298                         }
 299
 300                         if(*cp != '\0' && (cp = value(cp)) != NULL) {
 301                                 printf("%s\n", cp);
 302                                 if(putline(collf, cp, 1) < 0)
 303                                         goto err;
 304                         }
 305
 306                         break;
 307                 case 'd':
 308                         /*
 309                          * Read in the dead letter file.
 310                          */
 311                         if (strlcpy(linebuf + 2, getdeadletter(),
 312                                 sizeof(linebuf) - 2)
 313                             >= sizeof(linebuf) - 2) {
 314                                 printf("Line buffer overflow\n");
 315                                 break;
 316                         }
 317                         /* FALLTHROUGH */
 318                 case 'r':
 319                 case '<':
 320                         /*
 321                          * Invoke a file:
 322                          * Search for the file name,
 323                          * then open it and copy the contents to collf.
 324                          */
 325                         cp = &linebuf[2];
 326                         while (isspace((unsigned char)*cp))
 327                                 cp++;
 328                         if (*cp == '\0') {
 329                                 printf("Interpolate what file?\n");
 330                                 break;
 331                         }
 332                         cp = expand(cp);
 333                         if (cp == NULL)
 334                                 break;
 335                         if (*cp == '!') {
 336                                 /*
 337                                  * Insert stdout of command.
 338                                  */
 339                                 char *sh;
 340                                 int nullfd, tempfd, rc;
 341                                 char tempname2[PATHSIZE];
 342
 343                                 if ((nullfd = open(_PATH_DEVNULL, O_RDONLY, 0))
 344                                     == -1) {
 345                                         warn(_PATH_DEVNULL);
 346                                         break;
 347                                 }
 348
 349                                 (void)snprintf(tempname2, sizeof(tempname2),
 350                                     "%s/mail.ReXXXXXXXXXX", tmpdir);
 351                                 if ((tempfd = mkstemp(tempname2)) == -1 ||
 352                                     (fbuf = Fdopen(tempfd, "w+")) == NULL) {
 353                                         warn("%s", tempname2);
 354                                         break;
 355                                 }
 356                                 (void)unlink(tempname2);
 357
 358                                 if ((sh = value("SHELL")) == NULL)
 359                                         sh = _PATH_CSHELL;
 360
 361                                 rc = run_command(sh, 0, nullfd, fileno(fbuf),
 362                                     "-c", cp+1, NULL);
 363
 364                                 close(nullfd);
 365
 366                                 if (rc < 0) {
 367                                         (void)Fclose(fbuf);
 368                                         break;
 369                                 }
 370
 371                                 if (fsize(fbuf) == 0) {
 372                                         fprintf(stderr,
 373                                             "No bytes from command \"%s\"\n",
 374                                             cp+1);
 375                                         (void)Fclose(fbuf);
 376                                         break;
 377                                 }
 378
 379                                 rewind(fbuf);
 380                         } else if (isdir(cp)) {
 381                                 printf("%s: Directory\n", cp);
 382                                 break;
 383                         } else if ((fbuf = Fopen(cp, "r")) == NULL) {
 384                                 warn("%s", cp);
 385                                 break;
 386                         }
 387                         printf("\"%s\" ", cp);
 388                         (void)fflush(stdout);
 389                         lc = 0;
 390                         cc = 0;
 391                         while ((rc = readline(fbuf, linebuf, LINESIZE)) >= 0) {
 392                                 if (rc != LINESIZE - 1)
 393                                         lc++;
 394                                 if ((t = putline(collf, linebuf,
 395                                          rc != LINESIZE - 1)) < 0) {
 396                                         (void)Fclose(fbuf);
 397                                         goto err;
 398                                 }
 399                                 cc += t;
 400                         }
 401                         (void)Fclose(fbuf);
 402                         printf("%d/%d\n", lc, cc);
 403                         break;
 404                 case 'w':
 405                         /*
 406                          * Write the message on a file.
 407                          */
 408                         cp = &linebuf[2];
 409                         while (*cp == ' ' || *cp == '\t')
 410                                 cp++;
 411                         if (*cp == '\0') {
 412                                 fprintf(stderr, "Write what file!?\n");
 413                                 break;
 414                         }
 415                         if ((cp = expand(cp)) == NULL)
 416                                 break;
 417                         rewind(collf);
 418                         exwrite(cp, collf, 1);
 419                         break;
 420                 case 'm':
 421                 case 'M':
 422                 case 'f':
 423                 case 'F':
 424                         /*
 425                          * Interpolate the named messages, if we
 426                          * are in receiving mail mode.  Does the
 427                          * standard list processing garbage.
 428                          * If ~f is given, we don't shift over.
 429                          */
 430                         if (forward(linebuf + 2, collf, tempname, c) < 0)
 431                                 goto err;
 432                         goto cont;
 433                 case '?':
 434                         if ((fbuf = Fopen(_PATH_TILDE, "r")) == NULL) {
 435                                 warn("%s", _PATH_TILDE);
 436                                 break;
 437                         }
 438                         while ((t = getc(fbuf)) != EOF)
 439                                 (void)putchar(t);
 440                         (void)Fclose(fbuf);
 441                         break;
 442                 case 'p':
 443                         /*
 444                          * Print out the current state of the
 445                          * message without altering anything.
 446                          */
 447                         rewind(collf);
 448                         printf("-------\nMessage contains:\n");
 449                         puthead(hp, stdout, GTO|GSUBJECT|GCC|GBCC|GNL);
 450                         while ((t = getc(collf)) != EOF)
 451                                 (void)putchar(t);
 452                         goto cont;
 453                 case '|':
 454                         /*
 455                          * Pipe message through command.
 456                          * Collect output as new message.
 457                          */
 458                         rewind(collf);
 459                         mespipe(collf, &linebuf[2]);
 460                         goto cont;
 461                 case 'v':
 462                 case 'e':
 463                         /*
 464                          * Edit the current message.
 465                          * 'e' means to use EDITOR
 466                          * 'v' means to use VISUAL
 467                          */
 468                         rewind(collf);
 469                         mesedit(collf, c);
 470                         goto cont;
 471                 }
 472         }
 473         goto out;
 474 err:
 475         if (collf != NULL) {
 476                 (void)Fclose(collf);
 477                 collf = NULL;
 478         }
 479 out:
 480         if (collf != NULL)
 481                 rewind(collf);
 482         noreset--;
 483         (void)sigprocmask(SIG_BLOCK, &nset, NULL);
 484         (void)signal(SIGINT, saveint);
 485         (void)signal(SIGHUP, savehup);
 486         (void)signal(SIGTSTP, savetstp);
 487         (void)signal(SIGTTOU, savettou);
 488         (void)signal(SIGTTIN, savettin);
 489         (void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
 490         return (collf);
 491 }
 492
 493 /*
 494  * Write a file, ex-like if f set.
 495  */
 496 int
 497 exwrite(char name[], FILE *fp, int f)
 498 {
 499         FILE *of;
 500         int c, lc;
 501         long cc;
 502         struct stat junk;
 503
 504         if (f) {
 505                 printf("\"%s\" ", name);
 506                 (void)fflush(stdout);
 507         }
 508         if (stat(name, &junk) >= 0 && S_ISREG(junk.st_mode)) {
 509                 if (!f)
 510                         fprintf(stderr, "%s: ", name);
 511                 fprintf(stderr, "File exists\n");
 512                 return (-1);
 513         }
 514         if ((of = Fopen(name, "w")) == NULL) {
 515                 warn((char *)NULL);
 516                 return (-1);
 517         }
 518         lc = 0;
 519         cc = 0;
 520         while ((c = getc(fp)) != EOF) {
 521                 cc++;
 522                 if (c == '\n')
 523                         lc++;
 524                 (void)putc(c, of);
 525                 if (ferror(of)) {
 526                         warnx("%s", name);
 527                         (void)Fclose(of);
 528                         return (-1);
 529                 }
 530         }
 531         (void)Fclose(of);
 532         printf("%d/%ld\n", lc, cc);
 533         (void)fflush(stdout);
 534         return (0);
 535 }
 536
 537 /*
 538  * Edit the message being collected on fp.
 539  * On return, make the edit file the new temp file.
 540  */
 541 void
 542 mesedit(FILE *fp, int c)
 543 {
 544         sig_t sigint = signal(SIGINT, SIG_IGN);
 545         FILE *nf = run_editor(fp, (off_t)-1, c, 0);
 546
 547         if (nf != NULL) {
 548                 (void)fseeko(nf, (off_t)0, SEEK_END);
 549                 collf = nf;
 550                 (void)Fclose(fp);
 551         }
 552         (void)signal(SIGINT, sigint);
 553 }
 554
 555 /*
 556  * Pipe the message through the command.
 557  * Old message is on stdin of command;
 558  * New message collected from stdout.
 559  * Sh -c must return 0 to accept the new message.
 560  */
 561 void
 562 mespipe(FILE *fp, char cmd[])
 563 {
 564         FILE *nf;
 565         int fd;
 566         sig_t sigint = signal(SIGINT, SIG_IGN);
 567         char *sh, tempname[PATHSIZE];
 568
 569         (void)snprintf(tempname, sizeof(tempname),
 570             "%s/mail.ReXXXXXXXXXX", tmpdir);
 571         if ((fd = mkstemp(tempname)) == -1 ||
 572             (nf = Fdopen(fd, "w+")) == NULL) {
 573                 warn("%s", tempname);
 574                 goto out;
 575         }
 576         (void)rm(tempname);
 577         /*
 578          * stdin = current message.
 579          * stdout = new message.
 580          */
 581         if ((sh = value("SHELL")) == NULL)
 582                 sh = _PATH_CSHELL;
 583         if (run_command(sh,
 584             0, fileno(fp), fileno(nf), "-c", cmd, NULL) < 0) {
 585                 (void)Fclose(nf);
 586                 goto out;
 587         }
 588         if (fsize(nf) == 0) {
 589                 fprintf(stderr, "No bytes from \"%s\" !?\n", cmd);
 590                 (void)Fclose(nf);
 591                 goto out;
 592         }
 593         /*
 594          * Take new files.
 595          */
 596         (void)fseeko(nf, (off_t)0, SEEK_END);
 597         collf = nf;
 598         (void)Fclose(fp);
 599 out:
 600         (void)signal(SIGINT, sigint);
 601 }
 602
 603 /*
 604  * Interpolate the named messages into the current
 605  * message, preceding each line with a tab.
 606  * Return a count of the number of characters now in
 607  * the message, or -1 if an error is encountered writing
 608  * the message temporary.  The flag argument is 'm' if we
 609  * should shift over and 'f' if not.
 610  */
 611 int
 612 forward(char ms[], FILE *fp, char *fn, int f)
 613 {
 614         int *msgvec;
 615         struct ignoretab *ig;
 616         char *tabst;
 617
 618         msgvec = (int *)salloc((msgCount+1) * sizeof(*msgvec));
 619         if (msgvec == NULL)
 620                 return (0);
 621         if (getmsglist(ms, msgvec, 0) < 0)
 622                 return (0);
 623         if (*msgvec == 0) {
 624                 *msgvec = first(0, MMNORM);
 625                 if (*msgvec == 0) {
 626                         printf("No appropriate messages\n");
 627                         return (0);
 628                 }
 629                 msgvec[1] = 0;
 630         }
 631         if (f == 'f' || f == 'F')
 632                 tabst = NULL;
 633         else if ((tabst = value("indentprefix")) == NULL)
 634                 tabst = "\t";
 635         ig = isupper((unsigned char)f) ? NULL : ignore;
 636         printf("Interpolating:");
 637         for (; *msgvec != 0; msgvec++) {
 638                 struct message *mp = message + *msgvec - 1;
 639
 640                 touch(mp);
 641                 printf(" %d", *msgvec);
 642                 if (sendmessage(mp, fp, ig, tabst) < 0) {
 643                         warnx("%s", fn);
 644                         return (-1);
 645                 }
 646         }
 647         printf("\n");
 648         return (0);
 649 }
 650
 651 /*
 652  * Print (continue) when continued after ^Z.
 653  */
 654 /*ARGSUSED*/
 655 void
 656 collstop(int s)
 657 {
 658         sig_t old_action = signal(s, SIG_DFL);
 659         sigset_t nset;
 660
 661         (void)sigemptyset(&nset);
 662         (void)sigaddset(&nset, s);
 663         (void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
 664         (void)kill(0, s);
 665         (void)sigprocmask(SIG_BLOCK, &nset, NULL);
 666         (void)signal(s, old_action);
 667         if (colljmp_p) {
 668                 colljmp_p = 0;
 669                 hadintr = 0;
 670                 longjmp(colljmp, 1);
 671         }
 672 }
 673
 674 /*
 675  * On interrupt, come here to save the partial message in ~/dead.letter.
 676  * Then jump out of the collection loop.
 677  */
 678 /*ARGSUSED*/
 679 void
 680 collint(int s __unused)
 681 {
 682         /*
 683          * the control flow is subtle, because we can be called from ~q.
 684          */
 685         if (!hadintr) {
 686                 if (value("ignore") != NULL) {
 687                         printf("@");
 688                         (void)fflush(stdout);
 689                         clearerr(stdin);
 690                         return;
 691                 }
 692                 hadintr = 1;
 693                 longjmp(colljmp, 1);
 694         }
 695         rewind(collf);
 696         if (value("nosave") == NULL)
 697                 savedeadletter(collf);
 698         longjmp(collabort, 1);
 699 }
 700
 701 /*ARGSUSED*/
 702 void
 703 collhup(int s __unused)
 704 {
 705         rewind(collf);
 706         savedeadletter(collf);
 707         /*
 708          * Let's pretend nobody else wants to clean up,
 709          * a true statement at this time.
 710          */
 711         exit(1);
 712 }
 713
 714 void
 715 savedeadletter(FILE *fp)
 716 {
 717         FILE *dbuf;
 718         int c;
 719         char *cp;
 720
 721         if (fsize(fp) == 0)
 722                 return;
 723         cp = getdeadletter();
 724         c = umask(077);
 725         dbuf = Fopen(cp, "a");
 726         (void)umask(c);
 727         if (dbuf == NULL)
 728                 return;
 729         while ((c = getc(fp)) != EOF)
 730                 (void)putc(c, dbuf);
 731         (void)Fclose(dbuf);
 732         rewind(fp);
 733 }