1 /* $OpenBSD: savestr.c,v 1.3 2000/10/03 14:31:59 ho 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 "@(#) $Header: /home/cvs/src/usr.sbin/tcpdump/savestr.c,v 1.3 2000/10/03 14:31:59 ho Exp $ (LBL)"; 27 #endif 28 29 #include <sys/types.h> 30 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <string.h> 34 35 #include "gnuc.h" 36 #ifdef HAVE_OS_PROTO_H 37 #include "os-proto.h" 38 #endif 39 40 #include "savestr.h" 41 42 /* A replacement for strdup() that cuts down on malloc() overhead */ 43 char * 44 savestr(register const char *str) 45 { 46 register u_int size; 47 register char *p; 48 static char *strptr = NULL; 49 static u_int strsize = 0; 50 51 size = strlen(str) + 1; 52 if (size > strsize) { 53 strsize = 1024; 54 if (strsize < size) 55 strsize = size; 56 strptr = (char *)malloc(strsize); 57 if (strptr == NULL) { 58 fprintf(stderr, "savestr: malloc\n"); 59 exit(1); 60 } 61 } 62 (void)strcpy(strptr, str); 63 p = strptr; 64 strptr += size; 65 strsize -= size; 66 return (p); 67 } 68