external/ibm-public/postfix/dist/src/global/msg_stats_scan.c

   1 /*      $NetBSD$        */
   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_MASTER_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 /*      ... ATTR_SCAN_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
  35 /* System library. */
  36
  37 #include <sys_defs.h>
  38
  39 /* Utility library. */
  40
  41 #include <attr.h>
  42 #include <vstring.h>
  43 #include <msg.h>
  44
  45 /* Global library. */
  46
  47 #include <mail_proto.h>
  48 #include <msg_stats.h>
  49
  50  /*
  51   * SLMs.
  52   */
  53 #define STR(x) vstring_str(x)
  54 #define LEN(x) VSTRING_LEN(x)
  55
  56 /* msg_stats_scan - read MSG_STATS from stream */
  57
  58 int     msg_stats_scan(ATTR_SCAN_MASTER_FN scan_fn, VSTREAM *fp,
  59                                int flags, void *ptr)
  60 {
  61     MSG_STATS *stats = (MSG_STATS *) ptr;
  62     VSTRING *buf = vstring_alloc(sizeof(MSG_STATS) * 2);
  63     int     ret;
  64
  65     /*
  66      * Receive the entire structure. This is not only simpler but also likely
  67      * to be quicker than having the sender figure out what fields need to be
  68      * sent, converting those numbers to string and back, and having the
  69      * receiver initialize the unused fields by hand.
  70      *
  71      * XXX Would be nice if VSTRINGs could import a fixed-size buffer and
  72      * gracefully reject attempts to extend it.
  73      */
  74     ret = scan_fn(fp, flags | ATTR_FLAG_MORE,
  75                   ATTR_TYPE_DATA, MAIL_ATTR_TIME, buf,
  76                   ATTR_TYPE_END);
  77     if (ret == 1) {
  78         if (LEN(buf) == sizeof(*stats)) {
  79             memcpy((char *) stats, STR(buf), sizeof(*stats));
  80         } else {
  81             msg_warn("msg_stats_scan: size mis-match: %u != %u",
  82                      (unsigned) LEN(buf), (unsigned) sizeof(*stats));
  83             ret = (-1);
  84         }
  85     }
  86     vstring_free(buf);
  87     return (ret);
  88 }