usr.bin/mail/v7.local.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)v7.local.c       8.1 (Berkeley) 6/6/93
  30  * $FreeBSD: src/usr.bin/mail/v7.local.c,v 1.2.8.3 2003/01/06 05:46:04 mikeh Exp $
  31  * $DragonFly: src/usr.bin/mail/v7.local.c,v 1.4 2004/09/08 03:01:11 joerg Exp $
  32  */
  33
  34 /*
  35  * Mail -- a mail program
  36  *
  37  * Version 7
  38  *
  39  * Local routines that are installation dependent.
  40  */
  41
  42 #include "rcv.h"
  43 #include <fcntl.h>
  44 #include "extern.h"
  45
  46 /*
  47  * Locate the user's mailbox file (ie, the place where new, unread
  48  * mail is queued).
  49  */
  50 void
  51 findmail(char *user, char *buf, int buflen)
  52 {
  53         char *tmp = getenv("MAIL");
  54
  55         if (tmp == NULL)
  56                 snprintf(buf, buflen, "%s/%s", _PATH_MAILDIR, user);
  57         else
  58                 strlcpy(buf, tmp, buflen);
  59 }
  60
  61 /*
  62  * Get rid of the queued mail.
  63  */
  64 void
  65 demail(void)
  66 {
  67         if (value("keep") != NULL || rm(mailname) < 0)
  68                 close(open(mailname, O_CREAT | O_TRUNC | O_WRONLY, 0600));
  69 }
  70
  71 /*
  72  * Discover user login name.
  73  */
  74 char *
  75 username(void)
  76 {
  77         char *np;
  78         uid_t uid;
  79
  80         if ((np = getenv("USER")) != NULL)
  81                 return (np);
  82         if ((np = getenv("LOGNAME")) != NULL)
  83                 return (np);
  84         if ((np = getname(uid = getuid())) != NULL)
  85                 return (np);
  86         printf("Cannot associate a name with uid %u\n", (unsigned)uid);
  87         return (NULL);
  88 }