v7.local.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 * 4. 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#ifndef lint
33#if 0
34static char sccsid[] = "@(#)v7.local.c	8.1 (Berkeley) 6/6/93";
35#endif
36#endif /* not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: stable/11/usr.bin/mail/v7.local.c 330897 2018-03-14 03:19:51Z eadler $");
39
40/*
41 * Mail -- a mail program
42 *
43 * Version 7
44 *
45 * Local routines that are installation dependent.
46 */
47
48#include "rcv.h"
49#include <fcntl.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 */
56void
57findmail(char *user, char *buf, int buflen)
58{
59	char *tmp = getenv("MAIL");
60
61	if (tmp == NULL)
62		(void)snprintf(buf, buflen, "%s/%s", _PATH_MAILDIR, user);
63	else
64		(void)strlcpy(buf, tmp, buflen);
65}
66
67/*
68 * Get rid of the queued mail.
69 */
70void
71demail(void)
72{
73	int fd;
74
75	if (value("keep") != NULL || rm(mailname) < 0)
76		if ((fd = open(mailname, O_CREAT | O_TRUNC | O_WRONLY, 0600)) >=
77		    0)
78			(void)close(fd);
79}
80
81/*
82 * Discover user login name.
83 */
84char *
85username(void)
86{
87	char *np;
88	uid_t uid;
89
90	if ((np = getenv("USER")) != NULL)
91		return (np);
92	if ((np = getenv("LOGNAME")) != NULL)
93		return (np);
94	if ((np = getname(uid = getuid())) != NULL)
95		return (np);
96	printf("Cannot associate a name with uid %u\n", (unsigned)uid);
97	return (NULL);
98}
99