1/* $NetBSD: string.h,v 1.4 2015/02/25 14:55:57 riastradh Exp $ */
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _LINUX_STRING_H_
33#define _LINUX_STRING_H_
34
35#include <sys/types.h>
36#include <sys/cdefs.h>
37#include <sys/null.h>
38
39#include <linux/slab.h>
40
41static inline void *
42memchr_inv(const void *buffer, int c, size_t len)
43{
44 const uint8_t byte = c; /* XXX lose */
45 const char *p;
46
47 for (p = buffer; len-- > 0; p++)
48 if (*p != byte)
49 return __UNCONST(p);
50
51 return NULL;
52}
53
54static inline void *
55kmemdup(const void *src, size_t len, gfp_t gfp)
56{
57 void *dst;
58
59 dst = kmalloc(len, gfp);
60 if (dst == NULL)
61 return NULL;
62
63 (void)memcpy(dst, src, len);
64 return dst;
65}
66
67static inline char *
68kstrndup(const char *src, size_t maxlen, gfp_t gfp)
69{
70 char *dst;
71 size_t len;
72
73 if (src == NULL)
74 return NULL;
75
76 len = strnlen(src, maxlen);
77 dst = kmalloc(len + 1, gfp);
78 if (dst == NULL)
79 return NULL;
80
81 (void)memcpy(dst, src, len);
82 dst[len] = '\0';
83
84 return dst;
85}
86
87#endif /* _LINUX_STRING_H_ */
88