external/bsd/bind/dist/contrib/nslint-3.0a2/savestr.c

   1 /*      $NetBSD: savestr.c,v 1.1.1.3 2014/12/10 03:34:34 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) 1997
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that: (1) source code distributions
   9  * retain the above copyright notice and this paragraph in its entirety, (2)
  10  * distributions including binary code include the above copyright notice and
  11  * this paragraph in its entirety in the documentation or other materials
  12  * provided with the distribution, and (3) all advertising materials mentioning
  13  * features or use of this software display the following acknowledgement:
  14  * ``This product includes software developed by the University of California,
  15  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  16  * the University nor the names of its contributors may be used to endorse
  17  * or promote products derived from this software without specific prior
  18  * written permission.
  19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  20  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  22  */
  23
  24 #ifndef lint
  25 static const char rcsid[] =
  26     "@(#) Id: savestr.c,v 1.2 2006/03/09 02:27:11 leres Exp  (LBL)";
  27 #endif
  28
  29 #include <sys/types.h>
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33
  34 #include "gnuc.h"
  35 #ifdef HAVE_OS_PROTO_H
  36 #include "os-proto.h"
  37 #endif
  38
  39 #include "savestr.h"
  40
  41 /* A replacement for strdup() that cuts down on malloc() overhead */
  42 char *
  43 savestr(register const char *str)
  44 {
  45         register u_int size;
  46         register char *p;
  47         static char *strptr = NULL;
  48         static u_int strsize = 0;
  49
  50         size = strlen(str) + 1;
  51         if (size > strsize) {
  52                 strsize = 1024;
  53                 if (strsize < size)
  54                         strsize = size;
  55                 strptr = (char *)malloc(strsize);
  56                 if (strptr == NULL) {
  57                         fprintf(stderr, "savestr: malloc\n");
  58                         exit(1);
  59                 }
  60         }
  61         (void)strcpy(strptr, str);
  62         p = strptr;
  63         strptr += size;
  64         strsize -= size;
  65         return (p);
  66 }