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  * 4. 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
  30 #ifndef lint
  31 #if 0
  32 static char sccsid[] = "@(#)v7.local.c  8.1 (Berkeley) 6/6/93";
  33 #endif
  34 #endif /* not lint */
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 /*
  39  * Mail -- a mail program
  40  *
  41  * Version 7
  42  *
  43  * Local routines that are installation dependent.
  44  */
  45
  46 #include "rcv.h"
  47 #include <fcntl.h>
  48 #include "extern.h"
  49
  50 /*
  51  * Locate the user's mailbox file (ie, the place where new, unread
  52  * mail is queued).
  53  */
  54 void
  55 findmail(char *user, char *buf, int buflen)
  56 {
  57         char *tmp = getenv("MAIL");
  58
  59         if (tmp == NULL)
  60                 (void)snprintf(buf, buflen, "%s/%s", _PATH_MAILDIR, user);
  61         else
  62                 (void)strlcpy(buf, tmp, buflen);
  63 }
  64
  65 /*
  66  * Get rid of the queued mail.
  67  */
  68 void
  69 demail(void)
  70 {
  71         int fd;
  72
  73         if (value("keep") != NULL || rm(mailname) < 0)
  74                 if ((fd = open(mailname, O_CREAT | O_TRUNC | O_WRONLY, 0600)) >=
  75                     0)
  76                         (void)close(fd);
  77 }
  78
  79 /*
  80  * Discover user login name.
  81  */
  82 char *
  83 username(void)
  84 {
  85         char *np;
  86         uid_t uid;
  87
  88         if ((np = getenv("USER")) != NULL)
  89                 return (np);
  90         if ((np = getenv("LOGNAME")) != NULL)
  91                 return (np);
  92         if ((np = getname(uid = getuid())) != NULL)
  93                 return (np);
  94         printf("Cannot associate a name with uid %u\n", (unsigned)uid);
  95         return (NULL);
  96 }