contrib/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 #include <sendmail.h>
  15
  16 SM_RCSID("@(#)$Id: snprintf.c,v 8.44 2001/09/11 04:04:56 gshapiro Exp $")
  17
  18 /*
  19 **  SHORTENSTRING -- return short version of a string
  20 **
  21 **      If the string is already short, just return it.  If it is too
  22 **      long, return the head and tail of the string.
  23 **
  24 **      Parameters:
  25 **              s -- the string to shorten.
  26 **              m -- the max length of the string (strlen()).
  27 **
  28 **      Returns:
  29 **              Either s or a short version of s.
  30 */
  31
  32 char *
  33 shortenstring(s, m)
  34         register const char *s;
  35         size_t m;
  36 {
  37         size_t l;
  38         static char buf[MAXSHORTSTR + 1];
  39
  40         l = strlen(s);
  41         if (l < m)
  42                 return (char *) s;
  43         if (m > MAXSHORTSTR)
  44                 m = MAXSHORTSTR;
  45         else if (m < 10)
  46         {
  47                 if (m < 5)
  48                 {
  49                         (void) sm_strlcpy(buf, s, m + 1);
  50                         return buf;
  51                 }
  52                 (void) sm_strlcpy(buf, s, m - 2);
  53                 (void) sm_strlcat(buf, "...", sizeof buf);
  54                 return buf;
  55         }
  56         m = (m - 3) / 2;
  57         (void) sm_strlcpy(buf, s, m + 1);
  58         (void) sm_strlcat2(buf, "...", s + l - m, sizeof buf);
  59         return buf;
  60 }