usr.bin/mail/v7.local.c

   1 /*      $NetBSD: v7.local.c,v 1.17 2006/05/01 23:06:55 christos Exp $   */
   2
   3 /*
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)v7.local.c  8.1 (Berkeley) 6/6/93";
  36 #else
  37 __RCSID("$NetBSD: v7.local.c,v 1.17 2006/05/01 23:06:55 christos Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 /*
  42  * Mail -- a mail program
  43  *
  44  * Version 7
  45  *
  46  * Local routines that are installation dependent.
  47  */
  48
  49 #include "rcv.h"
  50 #include "extern.h"
  51
  52 /*
  53  * Locate the user's mailbox file (ie, the place where new, unread
  54  * mail is queued).
  55  */
  56 PUBLIC void
  57 findmail(const char *user, char *buf, size_t bufsize)
  58 {
  59         char *mbox;
  60
  61         if (!(mbox = getenv("MAIL")))
  62                 (void)snprintf(buf, bufsize, "%s/%s", _PATH_MAILDIR, user);
  63         else
  64                 (void)strlcpy(buf, mbox, bufsize);
  65 }
  66
  67 /*
  68  * Get rid of the queued mail.
  69  */
  70 PUBLIC void
  71 demail(void)
  72 {
  73
  74         int fd;
  75         /*
  76          * Do not remove the spool file, just truncate it to zero
  77          * bytes if possible, since we wouldn't preserve
  78          * owner/permissions otherwise.
  79          */
  80         if (value(ENAME_KEEP) != NULL || truncate(mailname, (off_t)0) < 0)
  81                 if ((fd = creat(mailname, 0600)) != -1)
  82                         (void)close(fd);
  83 }
  84
  85 /*
  86  * Discover user login name.
  87  */
  88 PUBLIC const char *
  89 username(void)
  90 {
  91         const char *np;
  92         uid_t uid;
  93
  94         if ((np = getenv("USER")) != NULL)
  95                 return np;
  96         if ((np = getname(uid = getuid())) != NULL)
  97                 return np;
  98         (void)printf("Cannot associate a name with uid %u\n", (unsigned)uid);
  99         return NULL;
 100 }