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/*++
/* NAME
/* msg_stats_scan
/* SUMMARY
/* read MSG_STATS from stream
/* SYNOPSIS
/* #include <msg_stats.h>
/*
/* int msg_stats_scan(scan_fn, stream, flags, ptr)
/* ATTR_SCAN_COMMON_FN scan_fn;
/* VSTREAM *stream;
/* int flags;
/* void *ptr;
/* DESCRIPTION
/* msg_stats_scan() reads an MSG_STATS from the named stream
/* using the specified attribute scan routine. msg_stats_scan()
/* is meant to be passed as a call-back to attr_scan(), thusly:
/*
/* ... RECV_ATTR_FUNC(msg_stats_scan, (void *) &stats), ...
/* DIAGNOSTICS
/* Fatal: out of memory.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
/* System library. */
#include <sys_defs.h>
/* Utility library. */
#include <attr.h>
#include <vstring.h>
#include <msg.h>
/* Global library. */
#include <mail_proto.h>
#include <msg_stats.h>
/*
* SLMs.
*/
#define STR(x) vstring_str(x)
#define LEN(x) VSTRING_LEN(x)
/* msg_stats_scan - read MSG_STATS from stream */
int msg_stats_scan(ATTR_SCAN_COMMON_FN scan_fn, VSTREAM *fp,
int flags, void *ptr)
{
MSG_STATS *stats = (MSG_STATS *) ptr;
VSTRING *buf = vstring_alloc(sizeof(MSG_STATS) * 2);
int ret;
/*
* Receive the entire structure. This is not only simpler but also likely
* to be quicker than having the sender figure out what fields need to be
* sent, converting those numbers to string and back, and having the
* receiver initialize the unused fields by hand.
*
* XXX Would be nice if VSTRINGs could import a fixed-size buffer and
* gracefully reject attempts to extend it.
*/
ret = scan_fn(fp, flags | ATTR_FLAG_MORE,
RECV_ATTR_DATA(MAIL_ATTR_TIME, buf),
ATTR_TYPE_END);
if (ret == 1) {
if (LEN(buf) == sizeof(*stats)) {
memcpy((void *) stats, STR(buf), sizeof(*stats));
} else {
msg_warn("msg_stats_scan: size mis-match: %u != %u",
(unsigned) LEN(buf), (unsigned) sizeof(*stats));
ret = (-1);
}
}
vstring_free(buf);
return (ret);
}
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