The Tcpdump Group git mirrors - tcpdump/blob - savestr.c

   1 /*
   2  * Copyright (c) 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char rcsid[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/Attic/savestr.c,v 1.4 1999-11-21 09:37:04 fenner Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <sys/types.h>
  32
  33 #ifdef HAVE_MALLOC_H
  34 #include <malloc.h>
  35 #endif
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #include "gnuc.h"
  41 #ifdef HAVE_OS_PROTO_H
  42 #include "os-proto.h"
  43 #endif
  44
  45 #include "savestr.h"
  46
  47 /* A replacement for strdup() that cuts down on malloc() overhead */
  48 char *
  49 savestr(register const char *str)
  50 {
  51         register u_int size;
  52         register char *p;
  53         static char *strptr = NULL;
  54         static u_int strsize = 0;
  55
  56         size = strlen(str) + 1;
  57         if (size > strsize) {
  58                 strsize = 1024;
  59                 if (strsize < size)
  60                         strsize = size;
  61                 strptr = (char *)malloc(strsize);
  62                 if (strptr == NULL) {
  63                         fprintf(stderr, "savestr: malloc\n");
  64                         exit(1);
  65                 }
  66         }
  67         (void)strcpy(strptr, str);
  68         p = strptr;
  69         strptr += size;
  70         strsize -= size;
  71         return (p);
  72 }