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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 #if 0
  36 static char sccsid[] = "@(#)v7.local.c  8.1 (Berkeley) 6/6/93";
  37 #endif
  38 #endif /* not lint */
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD$");
  41
  42 /*
  43  * Mail -- a mail program
  44  *
  45  * Version 7
  46  *
  47  * Local routines that are installation dependent.
  48  */
  49
  50 #include "rcv.h"
  51 #include <fcntl.h>
  52 #include "extern.h"
  53
  54 /*
  55  * Locate the user's mailbox file (ie, the place where new, unread
  56  * mail is queued).
  57  */
  58 void
  59 findmail(user, buf, buflen)
  60         char *user, *buf;
  61         int buflen;
  62 {
  63         char *tmp = getenv("MAIL");
  64
  65         if (tmp == NULL)
  66                 (void)snprintf(buf, buflen, "%s/%s", _PATH_MAILDIR, user);
  67         else
  68                 (void)strlcpy(buf, tmp, buflen);
  69 }
  70
  71 /*
  72  * Get rid of the queued mail.
  73  */
  74 void
  75 demail()
  76 {
  77
  78         if (value("keep") != NULL || rm(mailname) < 0)
  79                 (void)close(open(mailname, O_CREAT | O_TRUNC | O_WRONLY, 0600));
  80 }
  81
  82 /*
  83  * Discover user login name.
  84  */
  85 char *
  86 username()
  87 {
  88         char *np;
  89         uid_t uid;
  90
  91         if ((np = getenv("USER")) != NULL)
  92                 return (np);
  93         if ((np = getenv("LOGNAME")) != NULL)
  94                 return (np);
  95         if ((np = getname(uid = getuid())) != NULL)
  96                 return (np);
  97         printf("Cannot associate a name with uid %u\n", (unsigned)uid);
  98         return (NULL);
  99 }