1 /* $OpenBSD: savestr.c,v 1.9 2015/08/21 02:07:32 deraadt 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 #include <sys/types.h> 25 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <string.h> 29 30 #ifdef HAVE_OS_PROTO_H 31 #include "os-proto.h" 32 #endif 33 34 #include "savestr.h" 35 36 /* A replacement for strdup() that cuts down on malloc() overhead */ 37 char * 38 savestr(register const char *str) 39 { 40 register size_t size; 41 register char *p; 42 static char *strptr = NULL; 43 static size_t strsize = 0; 44 45 size = strlen(str) + 1; 46 if (size > strsize) { 47 strsize = 1024; 48 if (strsize < size) 49 strsize = size; 50 strptr = malloc(strsize); 51 if (strptr == NULL) { 52 fprintf(stderr, "savestr: malloc\n"); 53 exit(1); 54 } 55 } 56 (void)strlcpy(strptr, str, size); 57 p = strptr; 58 strptr += size; 59 strsize -= size; 60 return (p); 61 } 62