usr/src/cmd/sendmail/libsmutil/snprintf.c

   1 /*
   2  * Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  * Copyright (c) 1997 Eric P. Allman.  All rights reserved.
   5  * Copyright (c) 1988, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * By using this file, you agree to the terms and conditions set
   9  * forth in the LICENSE file which can be found at the top level of
  10  * the sendmail distribution.
  11  *
  12  */
  13
  14 #pragma ident   "%Z%%M% %I%     %E% SMI"
  15
  16 #include <sendmail.h>
  17
  18 SM_RCSID("@(#)$Id: snprintf.c,v 8.41 2001/08/28 23:07:01 gshapiro Exp $")
  19
  20 \f/*
  21 **  SHORTENSTRING -- return short version of a string
  22 **
  23 **      If the string is already short, just return it.  If it is too
  24 **      long, return the head and tail of the string.
  25 **
  26 **      Parameters:
  27 **              s -- the string to shorten.
  28 **              m -- the max length of the string (strlen()).
  29 **
  30 **      Returns:
  31 **              Either s or a short version of s.
  32 */
  33
  34 char *
  35 shortenstring(s, m)
  36         register const char *s;
  37         size_t m;
  38 {
  39         size_t l;
  40         static char buf[MAXSHORTSTR + 1];
  41
  42         l = strlen(s);
  43         if (l < m)
  44                 return (char *) s;
  45         if (m > MAXSHORTSTR)
  46                 m = MAXSHORTSTR;
  47         else if (m < 10)
  48         {
  49                 if (m < 5)
  50                 {
  51                         (void) sm_strlcpy(buf, s, m + 1);
  52                         return buf;
  53                 }
  54                 (void) sm_strlcpy(buf, s, m - 2);
  55                 (void) sm_strlcat(buf, "...", sizeof buf);
  56                 return buf;
  57         }
  58         m = (m - 3) / 2;
  59         (void) sm_strlcpy(buf, s, m + 1);
  60         (void) sm_strlcat2(buf, "...", s + l - m, sizeof buf);
  61         return buf;
  62 }