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main.c

/*    $OpenBSD: main.c,v 1.20 2007/08/06 19:16:06 sobrado Exp $   */
/*    $NetBSD: main.c,v 1.7 1997/05/13 06:15:57 mikel Exp $ */

/*
 * Copyright (c) 1980, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1993\n\
      The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static const char sccsid[] = "@(#)main.c  8.2 (Berkeley) 4/20/95";
#else
static const char rcsid[] = "$OpenBSD: main.c,v 1.20 2007/08/06 19:16:06 sobrado Exp $";
#endif
#endif /* not lint */

#include "rcv.h"
#include <fcntl.h>
#include <sys/ioctl.h>
#include "extern.h"

__dead      void  usage(void);
      int   main(int, char **);

/*
 * Mail -- a mail program
 *
 * Startup -- interface with user.
 */

int
main(int argc, char **argv)
{
      int i;
      struct name *to, *cc, *bcc, *smopts;
      char *subject;
      char *ef;
      char nosrc = 0;
      char *rc;
      extern const char version[];

      /*
       * Set up a reasonable environment.
       * Figure out whether we are being run interactively,
       * start the SIGCHLD catcher, and so forth.
       */
      (void)signal(SIGCHLD, sigchild);
      (void)signal(SIGPIPE, SIG_IGN);
      if (isatty(0))
            assign("interactive", "");
      image = -1;
      /*
       * Now, determine how we are being used.
       * We successively pick off - flags.
       * If there is anything left, it is the base of the list
       * of users to mail to.  Argp will be set to point to the
       * first of these users.
       */
      ef = NULL;
      to = NULL;
      cc = NULL;
      bcc = NULL;
      smopts = NULL;
      subject = NULL;
      while ((i = getopt(argc, argv, "INT:b:c:dfins:u:v")) != -1) {
            switch (i) {
            case 'T':
                  /*
                   * Next argument is temp file to write which
                   * articles have been read/deleted for netnews.
                   */
                  Tflag = optarg;
                  if ((i = creat(Tflag, 0600)) < 0)
                        err(1, "%s", Tflag);
                  (void)close(i);
                  break;
            case 'u':
                  /*
                   * Next argument is person to pretend to be.
                   */
                  if (strlen(optarg) >= MAXLOGNAME)
                        errx(1, "username `%s' too long", optarg);
                  unsetenv("MAIL");
                  myname = optarg;
                  uflag = 1;
                  break;
            case 'i':
                  /*
                   * User wants to ignore interrupts.
                   * Set the variable "ignore"
                   */
                  assign("ignore", "");
                  break;
            case 'd':
                  debug++;
                  break;
            case 's':
                  /*
                   * Give a subject field for sending from
                   * non terminal
                   */
                  subject = optarg;
                  break;
            case 'f':
                  /*
                   * User is specifying file to "edit" with Mail,
                   * as opposed to reading system mailbox.
                   * If no argument is given after -f, we read his
                   * mbox file.
                   *
                   * getopt() can't handle optional arguments, so here
                   * is an ugly hack to get around it.
                   */
                  if ((argv[optind]) && (argv[optind][0] != '-'))
                        ef = argv[optind++];
                  else
                        ef = "&";
                  break;
            case 'n':
                  /*
                   * User doesn't want to source /usr/lib/Mail.rc
                   */
                  nosrc++;
                  break;
            case 'N':
                  /*
                   * Avoid initial header printing.
                   */
                  assign("noheader", "");
                  break;
            case 'v':
                  /*
                   * Send mailer verbose flag
                   */
                  assign("verbose", "");
                  break;
            case 'I':
                  /*
                   * We're interactive
                   */
                  assign("interactive", "");
                  break;
            case 'c':
                  /*
                   * Get Carbon Copy Recipient list
                   */
                  cc = cat(cc, nalloc(optarg, GCC));
                  break;
            case 'b':
                  /*
                   * Get Blind Carbon Copy Recipient list
                   */
                  bcc = cat(bcc, nalloc(optarg, GBCC));
                  break;
            default:
                  usage();
                  /*NOTREACHED*/
            }
      }
      for (i = optind; (argv[i]) && (*argv[i] != '-'); i++)
            to = cat(to, nalloc(argv[i], GTO));
      for (; argv[i]; i++)
            smopts = cat(smopts, nalloc(argv[i], 0));
      /*
       * Check for inconsistent arguments.
       */
      if (to == NULL && (subject != NULL || cc != NULL || bcc != NULL))
            errx(1, "You must specify direct recipients with -s, -c, or -b");
      if (ef != NULL && to != NULL)
            errx(1, "Cannot give -f and people to send to");
      /*
       * Block SIGINT except where we install an explicit handler for it.
       */
      sigemptyset(&intset);
      sigaddset(&intset, SIGINT);
      (void)sigprocmask(SIG_BLOCK, &intset, NULL);
      /*
       * Initialization.
       */
      tinit();
      setscreensize();
      input = stdin;
      rcvmode = !to;
      spreserve();
      if (!nosrc)
            load(_PATH_MASTER_RC);
      /*
       * Expand returns a savestr, but load only uses the file name
       * for fopen, so it's safe to do this.
       */
      if ((rc = getenv("MAILRC")) == 0)
            rc = "~/.mailrc";
      load(expand(rc));
      if (!rcvmode) {
            mail(to, cc, bcc, smopts, subject);
            /*
             * why wait?
             */
            exit(senderr);
      }
      /*
       * Ok, we are reading mail.
       * Decide whether we are editing a mailbox or reading
       * the system mailbox, and open up the right stuff.
       */
      if (ef == NULL)
            ef = "%";
      if (setfile(ef) < 0)
            exit(1);          /* error already reported */

      if (value("quiet") == NULL)
            (void)printf("Mail version %s.  Type ? for help.\n",
                  version);
      announce();
      (void)fflush(stdout);
      commands();
      (void)ignoresig(SIGHUP, NULL, NULL);
      (void)ignoresig(SIGINT, NULL, NULL);
      (void)ignoresig(SIGQUIT, NULL, NULL);
      quit();
      exit(0);
}

/*
 * Compute what the screen size for printing headers should be.
 * We use the following algorithm for the height:
 *    If baud rate < 1200, use  9
 *    If baud rate = 1200, use 14
 *    If baud rate > 1200, use 24 or ws_row
 * Width is either 80 or ws_col;
 */
void
setscreensize(void)
{
      struct termios tbuf;
      struct winsize ws;
      speed_t ospeed;

      if (ioctl(1, TIOCGWINSZ, (char *) &ws) < 0)
            ws.ws_col = ws.ws_row = 0;
      if (tcgetattr(1, &tbuf) < 0)
            ospeed = 9600;
      else
            ospeed = cfgetospeed(&tbuf);
      if (ospeed < B1200)
            screenheight = 9;
      else if (ospeed == B1200)
            screenheight = 14;
      else if (ws.ws_row != 0)
            screenheight = ws.ws_row;
      else
            screenheight = 24;
      if ((realscreenheight = ws.ws_row) == 0)
            realscreenheight = 24;
      if ((screenwidth = ws.ws_col) == 0)
            screenwidth = 80;
}

__dead void
usage(void)
{

      fprintf(stderr, "usage: %s [-Iinv] [-b list] [-c list] "
          "[-s subject] to-addr ...\n", __progname);
      fprintf(stderr, "       %*s [-sendmail-options ...]\n",
          (int)strlen(__progname), "");
      fprintf(stderr, "       %s [-IiNnv] -f [name]\n", __progname);
      fprintf(stderr, "       %s [-IiNnv] [-u user]\n", __progname);
      exit(1);
}

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