1 /* $OpenBSD: ap_cpystrn.c,v 1.7 2005/06/20 12:23:22 robert Exp $ */
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2000-2003 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" must
29 * not be used to endorse or promote products derived from this
30 * software without prior written permission. For written
31 * permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * nor may "Apache" appear in their name, without prior written
35 * permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 *
56 * Portions of this software are based upon public domain software
57 * originally written at the National Center for Supercomputing Applications,
58 * University of Illinois, Urbana-Champaign.
59 */
60
61 #include "httpd.h"
62
63 /*
64 * Apache's "replacement" for the strncpy() function. We roll our
65 * own to implement these specific changes:
66 * (1) strncpy() doesn't always null terminate and we want it to.
67 * (2) strncpy() null fills, which is bogus, esp. when copy 8byte
68 * strings into 8k blocks.
69 * (3) Instead of returning the pointer to the beginning of
70 * the destination string, we return a pointer to the
71 * terminating '\0' to allow us to "check" for truncation
72 *
73 * ap_cpystrn() follows the same call structure as strncpy().
74 */
75
76 API_EXPORT(char *)
ap_cpystrn(char * dst,const char * src,size_t dst_size)77 ap_cpystrn(char *dst, const char *src, size_t dst_size)
78 {
79
80 char *d, *end;
81
82 if (!dst_size)
83 return (dst);
84
85 d = dst;
86 end = dst + dst_size - 1;
87
88 for (; d < end; ++d, ++src)
89 if (!(*d = *src))
90 return (d);
91
92 *d = '\0'; /* always null terminate */
93
94 return (d);
95 }
96