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