collect.c

   1 /*
   2  * S-nail - a mail user agent derived from Berkeley Mail.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 Steffen "Daode" Nurpmeso.
   6  */
   7 /*
   8  * Copyright (c) 1980, 1993
   9  *      The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  */
  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 "extern.h"
  49 #include <unistd.h>
  50 #include <sys/stat.h>
  51
  52 /* TODO longjmp() globbering as in cmd1.c and cmd3.c (see there)
  53  * TODO Problem: Popen doesn't encapsulate all cases of open failures,
  54  * TODO may leave child running if fdopen() fails! */
  55
  56 /*
  57  * Read a message from standard output and return a read file to it
  58  * or NULL on error.
  59  */
  60
  61 /*
  62  * The following hokiness with global variables is so that on
  63  * receipt of an interrupt signal, the partial message can be salted
  64  * away on dead.letter.
  65  */
  66
  67 static  sighandler_type         saveint;        /* Previous SIGINT value */
  68 static  sighandler_type         savehup;        /* Previous SIGHUP value */
  69 static  sighandler_type         savetstp;       /* Previous SIGTSTP value */
  70 static  sighandler_type         savettou;       /* Previous SIGTTOU value */
  71 static  sighandler_type         savettin;       /* Previous SIGTTIN value */
  72 static  FILE    *collf;                 /* File for saving away */
  73 static  int     hadintr;                /* Have seen one SIGINT so far */
  74
  75 static  sigjmp_buf      colljmp;        /* To get back to work */
  76 static  int             colljmp_p;      /* whether to long jump */
  77 static  sigjmp_buf      collabort;      /* To end collection with error */
  78
  79 static  sigjmp_buf pipejmp;             /* On broken pipe */
  80
  81 static void onpipe(int signo);
  82 static void insertcommand(FILE *fp, char *cmd);
  83 static void print_collf(FILE *collf, struct header *hp);
  84 static int include_file(FILE *fbuf, char *name, int *linecount,
  85                 int *charcount, int echo);
  86 static struct attachment *read_attachment_data(struct attachment *ap,
  87                 unsigned number);
  88 static struct attachment *append_attachments(struct attachment *attach,
  89                 char *names);
  90 static int exwrite(char *name, FILE *fp, int f);
  91 static enum okay makeheader(FILE *fp, struct header *hp);
  92 static void mesedit(int c, struct header *hp);
  93 static void mespipe(char *cmd);
  94 static int forward(char *ms, FILE *fp, int f);
  95 static void collstop(int s);
  96 static void collint(int s);
  97 static void collhup(int s);
  98 static int putesc(const char *s, FILE *stream);
  99
 100 /*ARGSUSED*/
 101 static void
 102 onpipe(int signo)
 103 {
 104         (void)signo;
 105         siglongjmp(pipejmp, 1);
 106 }
 107
 108 /*
 109  * Execute cmd and insert its standard output into fp.
 110  */
 111 static void
 112 insertcommand(FILE *fp, char *cmd)
 113 {
 114         FILE *obuf = NULL;
 115         char *volatile cp;
 116         int c;
 117
 118         cp = value("SHELL");
 119         if (sigsetjmp(pipejmp, 1))
 120                 goto endpipe;
 121         if (cp == NULL)
 122                 cp = SHELL;
 123         if ((obuf = Popen(cmd, "r", cp, 0)) == NULL) {
 124                 perror(cmd);
 125                 return;
 126         }
 127         safe_signal(SIGPIPE, onpipe);
 128         while ((c = getc(obuf)) != EOF)
 129                 putc(c, fp);
 130 endpipe:
 131         safe_signal(SIGPIPE, SIG_IGN);
 132         Pclose(obuf);
 133         safe_signal(SIGPIPE, dflpipe);
 134 }
 135
 136 /*
 137  * ~p command.
 138  */
 139 static void
 140 print_collf(FILE *collf, struct header *hp)
 141 {
 142         char *lbuf = NULL;
 143         FILE *volatile obuf = stdout;
 144         struct attachment *ap;
 145         char *cp;
 146         enum gfield     gf;
 147         size_t  linecnt, maxlines, linesize = 0, linelen, count, count2;
 148
 149         (void)&obuf;
 150         (void)&cp;
 151         fflush(collf);
 152         rewind(collf);
 153         count = count2 = fsize(collf);
 154         if (is_a_tty[0] && is_a_tty[1] && (cp = value("crt")) != NULL) {
 155                 for (linecnt = 0;
 156                         fgetline(&lbuf, &linesize, &count2, NULL, collf, 0);
 157                         linecnt++);
 158                 rewind(collf);
 159                 maxlines = (*cp == '\0' ? screensize() : atoi(cp));
 160                 maxlines -= 4;
 161                 if (hp->h_to)
 162                         maxlines--;
 163                 if (hp->h_subject)
 164                         maxlines--;
 165                 if (hp->h_cc)
 166                         maxlines--;
 167                 if (hp->h_bcc)
 168                         maxlines--;
 169                 if (hp->h_attach)
 170                         maxlines--;
 171                 maxlines -= myaddrs(hp) != NULL || hp->h_from != NULL;
 172                 maxlines -= value("ORGANIZATION") != NULL ||
 173                         hp->h_organization != NULL;
 174                 maxlines -= value("replyto") != NULL || hp->h_replyto != NULL;
 175                 maxlines -= value("sender") != NULL || hp->h_sender != NULL;
 176                 if ((long)maxlines < 0 || linecnt > maxlines) {
 177                         cp = get_pager();
 178                         if (sigsetjmp(pipejmp, 1))
 179                                 goto endpipe;
 180                         obuf = Popen(cp, "w", NULL, 1);
 181                         if (obuf == NULL) {
 182                                 perror(cp);
 183                                 obuf = stdout;
 184                         } else
 185                                 safe_signal(SIGPIPE, onpipe);
 186                 }
 187         }
 188         fprintf(obuf, catgets(catd, CATSET, 62,
 189                                 "-------\nMessage contains:\n"));
 190         gf = GIDENT|GTO|GSUBJECT|GCC|GBCC|GNL|GFILES;
 191         if (value("fullnames"))
 192                 gf |= GCOMMA;
 193         puthead(hp, obuf, gf, SEND_TODISP, CONV_NONE, NULL, NULL);
 194         while (fgetline(&lbuf, &linesize, &count, &linelen, collf, 1))
 195                 prout(lbuf, linelen, obuf);
 196         if (hp->h_attach != NULL) {
 197                 fputs(catgets(catd, CATSET, 63, "Attachments:"), obuf);
 198                 for (ap = hp->h_attach; ap != NULL; ap = ap->a_flink) {
 199                         if (ap->a_msgno)
 200                                 fprintf(obuf, " message %u", ap->a_msgno);
 201                         else
 202                                 fprintf(obuf, " %s", ap->a_name);
 203                         if (ap->a_flink)
 204                                 putc(',', obuf);
 205                 }
 206                 putc('\n', obuf);
 207         }
 208 endpipe:
 209         if (obuf != stdout) {
 210                 safe_signal(SIGPIPE, SIG_IGN);
 211                 Pclose(obuf);
 212                 safe_signal(SIGPIPE, dflpipe);
 213         }
 214         if (lbuf)
 215                 free(lbuf);
 216 }
 217
 218 static int
 219 include_file(FILE *fbuf, char *name, int *linecount, int *charcount, int echo)
 220 {
 221         char *interactive, *linebuf = NULL;
 222         size_t linesize = 0, linelen, count;
 223
 224         if (fbuf == NULL)
 225                 fbuf = Fopen(name, "r");
 226         if (fbuf == NULL) {
 227                 perror(name);
 228                 return (-1);
 229         }
 230         interactive = value("interactive");
 231         *linecount = 0;
 232         *charcount = 0;
 233         fflush(fbuf);
 234         rewind(fbuf);
 235         count = fsize(fbuf);
 236         while (fgetline(&linebuf, &linesize, &count, &linelen, fbuf, 0)
 237                         != NULL) {
 238                 if (fwrite(linebuf, sizeof *linebuf, linelen, collf)
 239                                 != linelen) {
 240                         Fclose(fbuf);
 241                         return (-1);
 242                 }
 243                 if (interactive != NULL && echo)
 244                         fwrite(linebuf, sizeof *linebuf, linelen, stdout);
 245                 (*linecount)++;
 246                 (*charcount) += linelen;
 247         }
 248         if (linebuf)
 249                 free(linebuf);
 250         Fclose(fbuf);
 251         if (fflush(collf))
 252                 return (-1);
 253         return (0);
 254 }
 255
 256 /*
 257  * Ask the user to edit file names and other data for the given
 258  * attachment. NULL is returned if no file name is given.
 259  */
 260 static struct attachment *
 261 read_attachment_data(struct attachment *ap, unsigned number)
 262 {
 263         char prefix[80], *cp;
 264
 265         if (ap == NULL)
 266                 ap = csalloc(1, sizeof *ap);
 267         if (ap->a_msgno) {
 268                 printf("#%u\tmessage %u\n", number, ap->a_msgno);
 269                 return ap;
 270         }
 271         snprintf(prefix, sizeof prefix, catgets(catd, CATSET, 50,
 272                         "#%u\tfilename: "), number);
 273         for (;;) {
 274                 char *exf;
 275                 if ((ap->a_name = readtty(prefix, ap->a_name)) == NULL)
 276                         break;
 277                 if ((exf = expand(ap->a_name)) != NULL)
 278                         ap->a_name = exf;
 279                 if (access(ap->a_name, R_OK) == 0)
 280                         break;
 281                 perror(ap->a_name);
 282         }
 283         if ((ap->a_name && (value("attachment-ask-charset"))) ||
 284                         ((cp = value("sendcharsets")) != NULL &&
 285                          strchr(cp, ',') != NULL)) {
 286                 snprintf(prefix, sizeof prefix, "#%u\tcharset: ", number);
 287                 ap->a_charset = readtty(prefix, ap->a_charset);
 288         }
 289         /*
 290          * The "attachment-ask-content-*" variables are left undocumented
 291          * since they are for RFC connoisseurs only.
 292          */
 293         if (ap->a_name && value("attachment-ask-content-type")) {
 294                 if (ap->a_content_type == NULL)
 295                         ap->a_content_type = mime_filecontent(ap->a_name);
 296                 snprintf(prefix, sizeof prefix, "#%u\tContent-Type: ", number);
 297                 ap->a_content_type = readtty(prefix, ap->a_content_type);
 298         }
 299         if (ap->a_name && value("attachment-ask-content-disposition")) {
 300                 snprintf(prefix, sizeof prefix,
 301                                 "#%u\tContent-Disposition: ", number);
 302                 ap->a_content_disposition = readtty(prefix,
 303                                 ap->a_content_disposition);
 304         }
 305         if (ap->a_name && value("attachment-ask-content-id")) {
 306                 snprintf(prefix, sizeof prefix, "#%u\tContent-ID: ", number);
 307                 ap->a_content_id = readtty(prefix, ap->a_content_id);
 308         }
 309         if (ap->a_name && value("attachment-ask-content-description")) {
 310                 snprintf(prefix, sizeof prefix,
 311                                 "#%u\tContent-Description: ", number);
 312                 ap->a_content_description = readtty(prefix,
 313                                 ap->a_content_description);
 314         }
 315         return ap->a_name ? ap : NULL;
 316 }
 317
 318 /*
 319  * Interactively edit the attachment list.
 320  */
 321 struct attachment *
 322 edit_attachments(struct attachment *attach)
 323 {
 324         struct attachment *ap, *nap;
 325         unsigned attno = 1;
 326
 327         for (ap = attach; ap; ap = ap->a_flink) {
 328                 if ((nap = read_attachment_data(ap, attno)) == NULL) {
 329                         if (ap->a_blink)
 330                                 ap->a_blink->a_flink = ap->a_flink;
 331                         else
 332                                 attach = ap->a_flink;
 333                         if (ap->a_flink)
 334                                 ap->a_flink->a_blink = ap->a_blink;
 335                         else
 336                                 return attach;
 337                 } else
 338                         attno++;
 339         }
 340         while ((nap = read_attachment_data(NULL, attno)) != NULL) {
 341                 for (ap = attach; ap && ap->a_flink; ap = ap->a_flink);
 342                 if (ap)
 343                         ap->a_flink = nap;
 344                 nap->a_blink = ap;
 345                 nap->a_flink = NULL;
 346                 if (attach == NULL)
 347                         attach = nap;
 348                 attno++;
 349         }
 350         return attach;
 351 }
 352
 353 /*
 354  * Put the given file to the end of the attachment list.
 355  */
 356 struct attachment *
 357 add_attachment(struct attachment *attach, char *file, int expand_file)
 358 {
 359         struct attachment *ap, *nap;
 360
 361         if (expand_file) {
 362                 file = expand(file);
 363                 if (file == NULL)
 364                         return NULL;
 365         } else
 366                 file = savestr(file);
 367         if (access(file, R_OK) != 0)
 368                 return NULL;
 369         /*LINTED*/
 370         nap = csalloc(1, sizeof *nap);
 371         nap->a_name = file;
 372         if (attach != NULL) {
 373                 for (ap = attach; ap->a_flink != NULL; ap = ap->a_flink);
 374                 ap->a_flink = nap;
 375                 nap->a_blink = ap;
 376         } else {
 377                 nap->a_blink = NULL;
 378                 attach = nap;
 379         }
 380         return attach;
 381 }
 382
 383 /*
 384  * Append the whitespace-separated file names to the end of
 385  * the attachment list.
 386  */
 387 static struct attachment *
 388 append_attachments(struct attachment *attach, char *names)
 389 {
 390         char *cp;
 391         int c;
 392         struct attachment *ap;
 393
 394         cp = names;
 395         while (*cp != '\0' && blankchar(*cp & 0377))
 396                 cp++;
 397         while (*cp != '\0') {
 398                 names = cp;
 399                 while (*cp != '\0' && !blankchar(*cp & 0377))
 400                         cp++;
 401                 c = *cp;
 402                 *cp++ = '\0';
 403                 if (*names != '\0') {
 404                         if ((ap = add_attachment(attach, names, 1)) == NULL)
 405                                 perror(names);
 406                         else
 407                                 attach = ap;
 408                 }
 409                 if (c == '\0')
 410                         break;
 411                 while (*cp != '\0' && blankchar(*cp & 0377))
 412                         cp++;
 413         }
 414         return attach;
 415 }
 416
 417 FILE *
 418 collect(struct header *hp, int printheaders, struct message *mp,
 419                 char *quotefile, int doprefix, int volatile tflag)
 420 {
 421         enum {
 422                 val_INTERACT    = 1
 423         };
 424
 425         FILE *fbuf;
 426         struct ignoretab *quoteig;
 427         int lc, cc, eofcount, val, c, t;
 428         int volatile escape, getfields;
 429         char *linebuf = NULL, *cp, *quote = NULL, *tempMail = NULL;
 430         size_t linesize;
 431         long count;
 432         enum sendaction action;
 433         sigset_t oset, nset;
 434         sighandler_type savedtop;
 435
 436         val = 0;
 437         if (value("interactive") != NULL)
 438                 val |= val_INTERACT;
 439
 440         collf = NULL;
 441         /*
 442          * Start catching signals from here, but we're still die on interrupts
 443          * until we're in the main loop.
 444          */
 445         sigemptyset(&nset);
 446         sigaddset(&nset, SIGINT);
 447         sigaddset(&nset, SIGHUP);
 448         sigprocmask(SIG_BLOCK, &nset, &oset);
 449         handlerpush(collint);
 450         if ((saveint = safe_signal(SIGINT, SIG_IGN)) != SIG_IGN)
 451                 safe_signal(SIGINT, collint);
 452         if ((savehup = safe_signal(SIGHUP, SIG_IGN)) != SIG_IGN)
 453                 safe_signal(SIGHUP, collhup);
 454         savetstp = safe_signal(SIGTSTP, collstop);
 455         savettou = safe_signal(SIGTTOU, collstop);
 456         savettin = safe_signal(SIGTTIN, collstop);
 457         if (sigsetjmp(collabort, 1))
 458                 goto jerr;
 459         if (sigsetjmp(colljmp, 1))
 460                 goto jerr;
 461         sigprocmask(SIG_SETMASK, &oset, (sigset_t *)NULL);
 462
 463         noreset++;
 464         if ((collf = Ftemp(&tempMail, "Rs", "w+", 0600, 1)) == NULL) {
 465                 perror(tr(51, "temporary mail file"));
 466                 goto jerr;
 467         }
 468         unlink(tempMail);
 469         Ftfree(&tempMail);
 470
 471         if ((cp = value("NAIL_HEAD")) != NULL && putesc(cp, collf) < 0)
 472                 goto jerr;
 473
 474         /*
 475          * If we are going to prompt for a subject,
 476          * refrain from printing a newline after
 477          * the headers (since some people mind).
 478          */
 479         getfields = 0;
 480         if (! tflag) {
 481                 t = GTO|GSUBJECT|GCC|GNL;
 482                 if (value("fullnames"))
 483                         t |= GCOMMA;
 484                 if (hp->h_subject == NULL && (val & val_INTERACT) &&
 485                             (value("ask") != NULL || value("asksub") != NULL))
 486                         t &= ~GNL, getfields |= GSUBJECT;
 487                 if (hp->h_to == NULL && (val & val_INTERACT))
 488                         t &= ~GNL, getfields |= GTO;
 489                 if (value("bsdcompat") == NULL && value("askatend") == NULL &&
 490                                 (val & val_INTERACT)) {
 491                         if (hp->h_bcc == NULL && value("askbcc"))
 492                                 t &= ~GNL, getfields |= GBCC;
 493                         if (hp->h_cc == NULL && value("askcc"))
 494                                 t &= ~GNL, getfields |= GCC;
 495                 }
 496                 if (printheaders) {
 497                         (void)puthead(hp, stdout, t, SEND_TODISP, CONV_NONE,
 498                                         NULL, NULL);
 499                         (void)fflush(stdout);
 500                 }
 501         }
 502
 503         /*
 504          * Quote an original message
 505          */
 506         if (mp != NULL && (doprefix || (quote = value("quote")) != NULL)) {
 507                 quoteig = allignore;
 508                 action = SEND_QUOTE;
 509                 if (doprefix) {
 510                         quoteig = fwdignore;
 511                         if ((cp = value("fwdheading")) == NULL)
 512                                 cp = "-------- Original Message --------";
 513                         if (*cp && fprintf(collf, "%s\n", cp) < 0)
 514                                 goto jerr;
 515                 } else if (strcmp(quote, "noheading") == 0) {
 516                         /*EMPTY*/;
 517                 } else if (strcmp(quote, "headers") == 0) {
 518                         quoteig = ignore;
 519                 } else if (strcmp(quote, "allheaders") == 0) {
 520                         quoteig = NULL;
 521                         action = SEND_QUOTE_ALL;
 522                 } else {
 523                         cp = hfield1("from", mp);
 524                         if (cp != NULL && (count = (long)strlen(cp)) > 0) {
 525                                 if (mime_write(cp, count,
 526                                                 collf, CONV_FROMHDR, TD_NONE,
 527                                                 NULL, (size_t) 0,
 528                                                 NULL, NULL) == 0)
 529                                         goto jerr;
 530                                 if (fprintf(collf, tr(52, " wrote:\n\n")) < 0)
 531                                         goto jerr;
 532                         }
 533                 }
 534                 if (fflush(collf))
 535                         goto jerr;
 536                 cp = value("indentprefix");
 537                 if (cp != NULL && *cp == '\0')
 538                         cp = "\t";
 539                 if (send(mp, collf, quoteig, (doprefix ? NULL : cp), action,
 540                                 NULL) < 0)
 541                         goto jerr;
 542         }
 543
 544         /* Print what we have sofar also on the terminal */
 545         (void)rewind(collf);
 546         while ((c = getc(collf)) != EOF)
 547                 (void)putc(c, stdout);
 548         if (fseek(collf, 0, SEEK_END))
 549                 goto jerr;
 550
 551         escape = ((cp = value("escape")) != NULL) ? *cp : ESCAPE;
 552         eofcount = 0;
 553         hadintr = 0;
 554
 555         if (! sigsetjmp(colljmp, 1)) {
 556                 if (getfields)
 557                         grabh(hp, getfields, 1);
 558                 if (quotefile != NULL) {
 559                         if (include_file(NULL, quotefile, &lc, &cc, 1) != 0)
 560                                 goto jerr;
 561                 }
 562         } else {
 563                 /*
 564                  * Come here for printing the after-signal message.
 565                  * Duplicate messages won't be printed because
 566                  * the write is aborted if we get a SIGTTOU.
 567                  */
 568 jcont:
 569                 if (hadintr) {
 570                         (void)fprintf(stderr, tr(53,
 571                                 "\n(Interrupt -- one more to kill letter)\n"));
 572                 } else {
 573                         printf(tr(54, "(continue)\n"));
 574                         (void)fflush(stdout);
 575                 }
 576         }
 577
 578         /*
 579          * No tilde escapes, interrupts not expected.  Simply copy STDIN
 580          */
 581         if ((val & val_INTERACT) == 0 && tildeflag <= 0 && ! tflag) {
 582                 linebuf = srealloc(linebuf, linesize = LINESIZE);
 583                 while ((count = fread(linebuf, sizeof *linebuf,
 584                                                 linesize, stdin)) > 0) {
 585                         if ((size_t)count != fwrite(linebuf, sizeof *linebuf,
 586                                                 count, collf))
 587                                 goto jerr;
 588                 }
 589                 if (fflush(collf))
 590                         goto jerr;
 591                 goto jout;
 592         }
 593
 594         /*
 595          * The interactive collect loop
 596          */
 597         for (;;) {
 598                 colljmp_p = 1;
 599                 count = readline(stdin, &linebuf, &linesize);
 600                 colljmp_p = 0;
 601                 if (count < 0) {
 602                         if ((val & val_INTERACT) &&
 603                             value("ignoreeof") != NULL && ++eofcount < 25) {
 604                                 printf(tr(55,
 605                                         "Use \".\" to terminate letter\n"));
 606                                 continue;
 607                         }
 608                         break;
 609                 }
 610                 if (tflag && count == 0) {
 611                         rewind(collf);
 612                         if (makeheader(collf, hp) != OKAY)
 613                                 goto jerr;
 614                         rewind(collf);
 615                         tflag = 0;
 616                         continue;
 617                 }
 618                 eofcount = 0;
 619                 hadintr = 0;
 620                 if (linebuf[0] == '.' && linebuf[1] == '\0' &&
 621                                 (val & val_INTERACT) &&
 622                                 (value("dot") != NULL ||
 623                                         value("ignoreeof") != NULL))
 624                         break;
 625                 if (linebuf[0] != escape ||
 626                                 ((val & val_INTERACT) == 0 && tildeflag == 0) ||
 627                                 tildeflag < 0) {
 628                         if (putline(collf, linebuf, count) < 0)
 629                                 goto jerr;
 630                         continue;
 631                 }
 632
 633                 c = linebuf[1];
 634                 switch (c) {
 635                 default:
 636                         /*
 637                          * On double escape, just send the single one.
 638                          * Otherwise, it's an error.
 639                          */
 640                         if (c == escape) {
 641                                 if (putline(collf, &linebuf[1], count - 1) < 0)
 642                                         goto jerr;
 643                                 else
 644                                         break;
 645                         }
 646                         printf(tr(56, "Unknown tilde escape.\n"));
 647                         break;
 648 #ifdef HAVE_ASSERTS
 649                 case 'C':
 650                         /* Dump core */
 651                         core(NULL);
 652                         break;
 653 #endif
 654                 case '!':
 655                         /* Shell escape, send the balance of line to sh -c */
 656                         shell(&linebuf[2]);
 657                         break;
 658                 case ':':
 659                 case '_':
 660                         /* Escape to command mode, but be nice! */
 661                         inhook = 0;
 662                         execute(&linebuf[2], 1, count - 2);
 663                         goto jcont;
 664                 case '.':
 665                         /* Simulate end of file on input */
 666                         goto jout;
 667                 case 'x':
 668                         /* Same as 'q', but no dead.letter saving */
 669                         hadintr++;
 670                         collint(0);
 671                         exit(1);
 672                         /*NOTREACHED*/
 673                 case 'q':
 674                         /*
 675                          * Force a quit of sending mail.
 676                          * Act like an interrupt happened.
 677                          */
 678                         hadintr++;
 679                         collint(SIGINT);
 680                         exit(1);
 681                         /*NOTREACHED*/
 682                 case 'h':
 683                         /* Grab a bunch of headers */
 684                         do
 685                                 grabh(hp, GTO|GSUBJECT|GCC|GBCC,
 686                                                 value("bsdcompat") != NULL &&
 687                                                 value("bsdorder") != NULL);
 688                         while (hp->h_to == NULL);
 689                         goto jcont;
 690                 case 'H':
 691                         /* Grab extra headers */
 692                         do
 693                                 grabh(hp, GEXTRA, 0);
 694                         while (check_from_and_sender(hp->h_from, hp->h_sender));
 695                         goto jcont;
 696                 case 't':
 697                         /* Add to the To list */
 698                         while ((hp->h_to = cat(hp->h_to, checkaddrs(
 699                                         lextract(&linebuf[2], GTO|GFULL))))
 700                                         == NULL)
 701                                 ;
 702                         break;
 703                 case 's':
 704                         /* Set the Subject list */
 705                         cp = &linebuf[2];
 706                         while (whitechar(*cp))
 707                                 ++cp;
 708                         hp->h_subject = savestr(cp);
 709                         break;
 710                 case '@':
 711                         /* Edit the attachment list */
 712                         if (linebuf[2] != '\0')
 713                                 hp->h_attach = append_attachments(hp->h_attach,
 714                                                 &linebuf[2]);
 715                         else
 716                                 hp->h_attach = edit_attachments(hp->h_attach);
 717                         break;
 718                 case 'c':
 719                         /* Add to the CC list */
 720                         hp->h_cc = cat(hp->h_cc, checkaddrs(
 721                                         lextract(&linebuf[2], GCC|GFULL)));
 722                         break;
 723                 case 'b':
 724                         /* Add stuff to blind carbon copies list */
 725                         hp->h_bcc = cat(hp->h_bcc, checkaddrs(
 726                                         lextract(&linebuf[2], GBCC|GFULL)));
 727                         break;
 728                 case 'd':
 729                         strncpy(linebuf + 2, getdeadletter(), linesize - 2);
 730                         linebuf[linesize-1]='\0';
 731                         /*FALLTHRU*/
 732                 case 'r':
 733                 case '<':
 734                         /*
 735                          * Invoke a file:
 736                          * Search for the file name,
 737                          * then open it and copy the contents to collf.
 738                          */
 739                         cp = &linebuf[2];
 740                         while (whitechar(*cp))
 741                                 cp++;
 742                         if (*cp == '\0') {
 743                                 printf(tr(57, "Interpolate what file?\n"));
 744                                 break;
 745                         }
 746                         if (*cp == '!') {
 747                                 insertcommand(collf, cp + 1);
 748                                 break;
 749                         }
 750                         cp = expand(cp);
 751                         if (cp == NULL)
 752                                 break;
 753                         if (is_dir(cp)) {
 754                                 printf(tr(58, "%s: Directory\n"), cp);
 755                                 break;
 756                         }
 757                         if ((fbuf = Fopen(cp, "r")) == NULL) {
 758                                 perror(cp);
 759                                 break;
 760                         }
 761                         printf(tr(59, "\"%s\" "), cp);
 762                         fflush(stdout);
 763                         if (include_file(fbuf, cp, &lc, &cc, 0) != 0)
 764                                 goto jerr;
 765                         printf(tr(60, "%d/%d\n"), lc, cc);
 766                         break;
 767                 case 'i':
 768                         /* Insert an environment variable into the file */
 769                         cp = &linebuf[2];
 770                         while (whitechar(*cp))
 771                                 ++cp;
 772                         if ((cp = value(cp)) == NULL || *cp == '\0')
 773                                 break;
 774                         if (putesc(cp, collf) < 0)
 775                                 goto jerr;
 776                         if ((val & val_INTERACT) && putesc(cp, stdout) < 0)
 777                                 goto jerr;
 778                         break;
 779                 case 'a':
 780                 case 'A':
 781                         /* Insert the contents of a signature variable */
 782                         if ((cp = value(c == 'a' ? "sign" : "Sign")) != NULL &&
 783                                         *cp != '\0') {
 784                                 if (putesc(cp, collf) < 0)
 785                                         goto jerr;
 786                                 if ((val & val_INTERACT) &&
 787                                                 putesc(cp, stdout) < 0)
 788                                         goto jerr;
 789                         }
 790                         break;
 791                 case 'w':
 792                         /* Write the message on a file */
 793                         cp = &linebuf[2];
 794                         while (blankchar(*cp))
 795                                 ++cp;
 796                         if (*cp == '\0' || (cp = expand(cp)) == NULL) {
 797                                 fprintf(stderr, tr(61, "Write what file!?\n"));
 798                                 break;
 799                         }
 800                         rewind(collf);
 801                         if (exwrite(cp, collf, 1) < 0)
 802                                 goto jerr;
 803                         break;
 804                 case 'm':
 805                 case 'M':
 806                 case 'f':
 807                 case 'F':
 808                         /*
 809                          * Interpolate the named messages, if we
 810                          * are in receiving mail mode.  Does the
 811                          * standard list processing garbage.
 812                          * If ~f is given, we don't shift over.
 813                          */
 814                         if (forward(linebuf + 2, collf, c) < 0)
 815                                 goto jerr;
 816                         goto jcont;
 817                 case 'p':
 818                         /*
 819                          * Print out the current state of the
 820                          * message without altering anything.
 821                          */
 822                         print_collf(collf, hp);
 823                         goto jcont;
 824                 case '|':
 825                         /*
 826                          * Pipe message through command.
 827                          * Collect output as new message.
 828                          */
 829                         rewind(collf);
 830                         mespipe(&linebuf[2]);
 831                         goto jcont;
 832                 case 'v':
 833                 case 'e':
 834                         /*
 835                          * Edit the current message.
 836                          * 'e' means to use EDITOR
 837                          * 'v' means to use VISUAL
 838                          */
 839                         rewind(collf);
 840                         mesedit(c, value("editheaders") ? hp : NULL);
 841                         goto jcont;
 842                 case '?':
 843                         /*
 844                          * Last the lengthy help string.
 845                          * (Very ugly, but take care for compiler supported
 846                          * string lengths :()
 847                          */
 848                         (void)puts(
 849 "-------------------- ~ ESCAPES ----------------------------\n"
 850 "~~             Quote a single tilde\n"
 851 "~@ [file ...]  Edit attachment list\n"
 852 "~b users       Add users to \"blind\" cc list\n"
 853 "~c users       Add users to cc list\n"
 854 "~d             Read in dead.letter\n"
 855 "~e             Edit the message buffer\n"
 856 "~f messages    Read in messages without indenting lines\n"
 857 "~F messages    Same as ~f, but keep all header lines\n"
 858 "~h             Prompt for to list, subject, cc, and \"blind\" cc list\n");
 859                         (void)puts(
 860 "~r file        Read a file into the message buffer\n"
 861 "~p             Print the message buffer\n"
 862 "~q             Abort message composition and save text to dead.letter\n"
 863 "~m messages    Read in messages with each line indented\n"
 864 "~M messages    Same as ~m, but keep all header lines\n"
 865 "~s subject     Set subject\n"
 866 "~t users       Add users to to list\n"
 867 "~v             Invoke display editor on message\n"
 868 "~w file        Write message onto file\n"
 869 "~x             Abort message composition and discard text written so far\n");
 870                         (void)puts(
 871 "~!command      Invoke the shell\n"
 872 "~:command      Execute a regular command\n"
 873 "-----------------------------------------------------------\n");
 874                         break;
 875
 876                 }
 877         }
 878 jout:
 879         if (collf != NULL) {
 880                 if ((cp = value("NAIL_TAIL")) != NULL) {
 881                         if (putesc(cp, collf) < 0)
 882                                 goto jerr;
 883                         if ((val & val_INTERACT) && putesc(cp, stdout) < 0)
 884                                 goto jerr;
 885                 }
 886                 rewind(collf);
 887         }
 888         handlerpop();
 889         noreset--;
 890         sigemptyset(&nset);
 891         sigaddset(&nset, SIGINT);
 892         sigaddset(&nset, SIGHUP);
 893         sigprocmask(SIG_BLOCK, &nset, (sigset_t*)NULL);
 894         safe_signal(SIGINT, saveint);
 895         safe_signal(SIGHUP, savehup);
 896         safe_signal(SIGTSTP, savetstp);
 897         safe_signal(SIGTTOU, savettou);
 898         safe_signal(SIGTTIN, savettin);
 899         sigprocmask(SIG_SETMASK, &oset, (sigset_t*)NULL);
 900         return (collf);
 901 jerr:
 902         if (tempMail != NULL) {
 903                 rm(tempMail);
 904                 Ftfree(&tempMail);
 905         }
 906         if (collf != NULL) {
 907                 Fclose(collf);
 908                 collf = NULL;
 909         }
 910         goto jout;
 911 }
 912
 913 /*
 914  * Write a file, ex-like if f set.
 915  */
 916 static int
 917 exwrite(char *name, FILE *fp, int f)
 918 {
 919         FILE *of;
 920         int c;
 921         long cc;
 922         int lc;
 923
 924         if (f) {
 925                 printf("\"%s\" ", name);
 926                 fflush(stdout);
 927         }
 928         if ((of = Fopen(name, "a")) == NULL) {
 929                 perror(NULL);
 930                 return(-1);
 931         }
 932         lc = 0;
 933         cc = 0;
 934         while ((c = getc(fp)) != EOF) {
 935                 cc++;
 936                 if (c == '\n')
 937                         lc++;
 938                 putc(c, of);
 939                 if (ferror(of)) {
 940                         perror(name);
 941                         Fclose(of);
 942                         return(-1);
 943                 }
 944         }
 945         Fclose(of);
 946         printf(catgets(catd, CATSET, 65, "%d/%ld\n"), lc, cc);
 947         fflush(stdout);
 948         return(0);
 949 }
 950
 951 static enum okay
 952 makeheader(FILE *fp, struct header *hp)
 953 {
 954         char *tempEdit;
 955         FILE *nf;
 956         int c;
 957
 958         if ((nf = Ftemp(&tempEdit, "Re", "w+", 0600, 1)) == NULL) {
 959                 perror(catgets(catd, CATSET, 66, "temporary mail edit file"));
 960                 Fclose(nf);
 961                 unlink(tempEdit);
 962                 Ftfree(&tempEdit);
 963                 return STOP;
 964         }
 965         unlink(tempEdit);
 966         Ftfree(&tempEdit);
 967         extract_header(fp, hp);
 968         while ((c = getc(fp)) != EOF)
 969                 putc(c, nf);
 970         if (fp != collf)
 971                 Fclose(collf);
 972         Fclose(fp);
 973         collf = nf;
 974         if (check_from_and_sender(hp->h_from, hp->h_sender))
 975                 return STOP;
 976         return OKAY;
 977 }
 978
 979 /*
 980  * Edit the message being collected on fp.
 981  * On return, make the edit file the new temp file.
 982  */
 983 static void
 984 mesedit(int c, struct header *hp)
 985 {
 986         sighandler_type sigint = safe_signal(SIGINT, SIG_IGN);
 987         FILE *nf = run_editor(collf, (off_t)-1, c, 0, hp, NULL, SEND_MBOX,
 988                         sigint);
 989
 990         if (nf != NULL) {
 991                 if (hp) {
 992                         rewind(nf);
 993                         makeheader(nf, hp);
 994                 } else {
 995                         fseek(nf, 0L, SEEK_END);
 996                         Fclose(collf);
 997                         collf = nf;
 998                 }
 999         }
1000         safe_signal(SIGINT, sigint);
1001 }
1002
1003 /*
1004  * Pipe the message through the command.
1005  * Old message is on stdin of command;
1006  * New message collected from stdout.
1007  * Sh -c must return 0 to accept the new message.
1008  */
1009 static void
1010 mespipe(char *cmd)
1011 {
1012         FILE *nf;
1013         sighandler_type sigint = safe_signal(SIGINT, SIG_IGN);
1014         char *tempEdit;
1015         char *shell;
1016
1017         if ((nf = Ftemp(&tempEdit, "Re", "w+", 0600, 1)) == NULL) {
1018                 perror(catgets(catd, CATSET, 66, "temporary mail edit file"));
1019                 goto out;
1020         }
1021         fflush(collf);
1022         unlink(tempEdit);
1023         Ftfree(&tempEdit);
1024         /*
1025          * stdin = current message.
1026          * stdout = new message.
1027          */
1028         if ((shell = value("SHELL")) == NULL)
1029                 shell = SHELL;
1030         if (run_command(shell,
1031             0, fileno(collf), fileno(nf), "-c", cmd, NULL) < 0) {
1032                 Fclose(nf);
1033                 goto out;
1034         }
1035         if (fsize(nf) == 0) {
1036                 fprintf(stderr, catgets(catd, CATSET, 67,
1037                                 "No bytes from \"%s\" !?\n"), cmd);
1038                 Fclose(nf);
1039                 goto out;
1040         }
1041         /*
1042          * Take new files.
1043          */
1044         fseek(nf, 0L, SEEK_END);
1045         Fclose(collf);
1046         collf = nf;
1047 out:
1048         safe_signal(SIGINT, sigint);
1049 }
1050
1051 /*
1052  * Interpolate the named messages into the current
1053  * message, preceding each line with a tab.
1054  * Return a count of the number of characters now in
1055  * the message, or -1 if an error is encountered writing
1056  * the message temporary.  The flag argument is 'm' if we
1057  * should shift over and 'f' if not.
1058  */
1059 static int
1060 forward(char *ms, FILE *fp, int f)
1061 {
1062         int *msgvec;
1063         struct ignoretab *ig;
1064         char *tabst;
1065         enum sendaction action;
1066
1067         /*LINTED*/
1068         msgvec = (int *)salloc((msgCount+1) * sizeof *msgvec);
1069         if (msgvec == NULL)
1070                 return(0);
1071         if (getmsglist(ms, msgvec, 0) < 0)
1072                 return(0);
1073         if (*msgvec == 0) {
1074                 *msgvec = first(0, MMNORM);
1075                 if (*msgvec == 0) {
1076                         printf(catgets(catd, CATSET, 68,
1077                                         "No appropriate messages\n"));
1078                         return(0);
1079                 }
1080                 msgvec[1] = 0;
1081         }
1082         if (f == 'f' || f == 'F')
1083                 tabst = NULL;
1084         else if ((tabst = value("indentprefix")) == NULL)
1085                 tabst = "\t";
1086         ig = upperchar(f) ? (struct ignoretab *)NULL : ignore;
1087         action = upperchar(f) ? SEND_QUOTE_ALL : SEND_QUOTE;
1088         printf(catgets(catd, CATSET, 69, "Interpolating:"));
1089         for (; *msgvec != 0; msgvec++) {
1090                 struct message *mp = message + *msgvec - 1;
1091
1092                 touch(mp);
1093                 printf(" %d", *msgvec);
1094                 if (send(mp, fp, ig, tabst, action, NULL) < 0) {
1095                         perror(catgets(catd, CATSET, 70,
1096                                         "temporary mail file"));
1097                         return(-1);
1098                 }
1099         }
1100         printf("\n");
1101         return(0);
1102 }
1103
1104 /*
1105  * Print (continue) when continued after ^Z.
1106  */
1107 /*ARGSUSED*/
1108 static void
1109 collstop(int s)
1110 {
1111         sighandler_type old_action = safe_signal(s, SIG_DFL);
1112         sigset_t nset;
1113
1114         sigemptyset(&nset);
1115         sigaddset(&nset, s);
1116         sigprocmask(SIG_UNBLOCK, &nset, (sigset_t *)NULL);
1117         kill(0, s);
1118         sigprocmask(SIG_BLOCK, &nset, (sigset_t *)NULL);
1119         safe_signal(s, old_action);
1120         if (colljmp_p) {
1121                 colljmp_p = 0;
1122                 hadintr = 0;
1123                 siglongjmp(colljmp, 1);
1124         }
1125 }
1126
1127 /*
1128  * On interrupt, come here to save the partial message in ~/dead.letter.
1129  * Then jump out of the collection loop.
1130  */
1131 /*ARGSUSED*/
1132 static void
1133 collint(int s)
1134 {
1135         /*
1136          * the control flow is subtle, because we can be called from ~q.
1137          */
1138         if (!hadintr) {
1139                 if (value("ignore") != NULL) {
1140                         puts("@");
1141                         fflush(stdout);
1142                         clearerr(stdin);
1143                         return;
1144                 }
1145                 hadintr = 1;
1146                 siglongjmp(colljmp, 1);
1147         }
1148         exit_status |= 04;
1149         rewind(collf);
1150         if (value("save") != NULL && s != 0)
1151                 savedeadletter(collf);
1152         siglongjmp(collabort, 1);
1153 }
1154
1155 /*ARGSUSED*/
1156 static void
1157 collhup(int s)
1158 {
1159         (void)s;
1160         rewind(collf);
1161         savedeadletter(collf);
1162         /*
1163          * Let's pretend nobody else wants to clean up,
1164          * a true statement at this time.
1165          */
1166         exit(1);
1167 }
1168
1169 void
1170 savedeadletter(FILE *fp)
1171 {
1172         FILE *dbuf;
1173         int c, lines = 0, bytes = 0;
1174         char *cp;
1175
1176         if (fsize(fp) == 0)
1177                 return;
1178         cp = getdeadletter();
1179         c = umask(077);
1180         dbuf = Fopen(cp, "a");
1181         umask(c);
1182         if (dbuf == NULL)
1183                 return;
1184         printf("\"%s\" ", cp);
1185         while ((c = getc(fp)) != EOF) {
1186                 putc(c, dbuf);
1187                 bytes++;
1188                 if (c == '\n')
1189                         lines++;
1190         }
1191         Fclose(dbuf);
1192         printf("%d/%d\n", lines, bytes);
1193         rewind(fp);
1194 }
1195
1196 static int
1197 putesc(const char *s, FILE *stream)
1198 {
1199         int     n = 0;
1200
1201         while (s[0]) {
1202                 if (s[0] == '\\') {
1203                         if (s[1] == 't') {
1204                                 if (putc('\t', stream) == EOF)
1205                                         return (-1);
1206                                 n++;
1207                                 s += 2;
1208                                 continue;
1209                         }
1210                         if (s[1] == 'n') {
1211                                 if (putc('\n', stream) == EOF)
1212                                         return (-1);
1213                                 n++;
1214                                 s += 2;
1215                                 continue;
1216                         }
1217                 }
1218                 if (putc(s[0], stream) == EOF)
1219                         return (-1);
1220                 n++;
1221                 s++;
1222         }
1223         if (putc('\n', stream) == EOF)
1224                 return (-1);
1225         return (++n);
1226 }