1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
23/*	  All Rights Reserved  	*/
24
25#pragma ident	"%Z%%M%	%I%	%E% SMI"
26
27/*
28 *  NAME
29 *	cksaved - check for an orphaned save file
30 *
31 *  SYNOPSIS
32 *	void cksaved(char *user)
33 *
34 *  DESCRIPTION
35 *	cksaved() looks to see if there is a saved-mail file sitting
36 *	around which should be reinstated. These files should be sitting
37 *	around only in the case of a crash during rewriting a mail message.
38 *
39 *	The strategy is simple: if the file exists it is appended to
40 *	the end of $MAIL.  It is better that a user potentially sees the
41 *	mail twice than to lose it.
42 *
43 *	If $MAIL doesn't exist, then a simple rename() will suffice.
44 */
45
46#include "mail.h"
47void
48cksaved(user)
49char	*user;
50{
51	struct stat stbuf;
52	char command[512];
53	char save[MAXFILENAME], mail[MAXFILENAME];
54
55	cat(mail, maildir, user);
56	cat(save, mailsave, user);
57
58	/*
59	 *	If no save file, or size is 0, return.
60	 */
61	if ((stat(save, &stbuf) != 0) || (stbuf.st_size == 0))
62		return;
63
64	/*
65	 *	Ok, we have a savefile. If no mailfile exists,
66	 *	then we want to restore to the mailfile,
67	 *	else we append to the mailfile.
68	 */
69	lock(user);
70	if (stat(mail, &stbuf) != 0) {
71		/*
72		 *	Restore from the save file by linking
73		 *	it to $MAIL then unlinking save file
74		 */
75		chmod(save, MFMODE);
76#ifdef SVR3
77		if (link(save, mail) != 0) {
78			unlock();
79			perror("Restore failed to link to mailfile");
80			return;
81		}
82
83		if (unlink(save) != 0) {
84			unlock();
85			perror("Cannot unlink saved file");
86			return;
87		}
88#else
89		if (rename(save, mail) != 0) {
90			unlock();
91			perror("Cannot rename saved file");
92			return;
93		}
94#endif
95
96		(void) snprintf(command, sizeof (command),
97		    "echo \"Your mailfile was just restored by the mail "
98		    "program.\nPermissions of your mailfile are set "
99		    "to 0660.\"| mail %s", user);
100	}
101
102	else {
103		FILE *Istream, *Ostream;
104		if ((Ostream = fopen(mail, "a")) == NULL) {
105			(void) fprintf(stderr,
106			    "%s: Cannot open file '%s' for output\n",
107			program, mail);
108			unlock();
109			return;
110		}
111		if ((Istream = fopen(save, "r")) == NULL) {
112			(void) fprintf(stderr, "%s: Cannot open saved "
113			    "file '%s' for reading\n", program, save);
114			fclose(Ostream);
115			unlock();
116			return;
117		}
118		copystream(Istream, Ostream);
119		fclose(Istream);
120		fclose(Ostream);
121
122		if (unlink(save) != 0) {
123			perror("Unlink of save file failed");
124			return;
125		}
126
127		(void) snprintf(command, sizeof (command),
128		    "echo \"Your mail save file has just been appended "
129		    "to your mail box by the mail program.\" | mail %s", user);
130	}
131
132	/*
133	 *	Try to send mail to the user whose file
134	 *	is being restored.
135	 */
136	unlock();
137	systm(command);
138}
139