1 /* $NetBSD: msg_stats_scan.c,v 1.3 2022/10/08 16:12:45 christos Exp $ */
2
3 /*++
4 /* NAME
5 /* msg_stats_scan
6 /* SUMMARY
7 /* read MSG_STATS from stream
8 /* SYNOPSIS
9 /* #include <msg_stats.h>
10 /*
11 /* int msg_stats_scan(scan_fn, stream, flags, ptr)
12 /* ATTR_SCAN_COMMON_FN scan_fn;
13 /* VSTREAM *stream;
14 /* int flags;
15 /* void *ptr;
16 /* DESCRIPTION
17 /* msg_stats_scan() reads an MSG_STATS from the named stream
18 /* using the specified attribute scan routine. msg_stats_scan()
19 /* is meant to be passed as a call-back to attr_scan(), thusly:
20 /*
21 /* ... RECV_ATTR_FUNC(msg_stats_scan, (void *) &stats), ...
22 /* DIAGNOSTICS
23 /* Fatal: out of memory.
24 /* LICENSE
25 /* .ad
26 /* .fi
27 /* The Secure Mailer license must be distributed with this software.
28 /* AUTHOR(S)
29 /* Wietse Venema
30 /* IBM T.J. Watson Research
31 /* P.O. Box 704
32 /* Yorktown Heights, NY 10598, USA
33 /*
34 /* Wietse Venema
35 /* Google, Inc.
36 /* 111 8th Avenue
37 /* New York, NY 10011, USA
38 /*--*/
39
40 /* System library. */
41
42 #include <sys_defs.h>
43
44 /* Utility library. */
45
46 #include <attr.h>
47 #include <vstring.h>
48 #include <msg.h>
49
50 /* Global library. */
51
52 #include <mail_proto.h>
53 #include <msg_stats.h>
54
55 /*
56 * SLMs.
57 */
58 #define STR(x) vstring_str(x)
59 #define LEN(x) VSTRING_LEN(x)
60
61 /* msg_stats_scan - read MSG_STATS from stream */
62
msg_stats_scan(ATTR_SCAN_COMMON_FN scan_fn,VSTREAM * fp,int flags,void * ptr)63 int msg_stats_scan(ATTR_SCAN_COMMON_FN scan_fn, VSTREAM *fp,
64 int flags, void *ptr)
65 {
66 MSG_STATS *stats = (MSG_STATS *) ptr;
67 VSTRING *buf = vstring_alloc(sizeof(MSG_STATS) * 2);
68 int ret;
69
70 /*
71 * Receive the entire structure. This is not only simpler but also likely
72 * to be quicker than having the sender figure out what fields need to be
73 * sent, converting those numbers to string and back, and having the
74 * receiver initialize the unused fields by hand.
75 *
76 * XXX Would be nice if VSTRINGs could import a fixed-size buffer and
77 * gracefully reject attempts to extend it.
78 */
79 ret = scan_fn(fp, flags | ATTR_FLAG_MORE,
80 RECV_ATTR_DATA(MAIL_ATTR_TIME, buf),
81 ATTR_TYPE_END);
82 if (ret == 1) {
83 if (LEN(buf) == sizeof(*stats)) {
84 memcpy((void *) stats, STR(buf), sizeof(*stats));
85 } else {
86 msg_warn("msg_stats_scan: size mis-match: %u != %u",
87 (unsigned) LEN(buf), (unsigned) sizeof(*stats));
88 ret = (-1);
89 }
90 }
91 vstring_free(buf);
92 return (ret);
93 }
94