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 41 static inline void * 42 memchr_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 54 static inline void * 55 kmemdup(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 67 static inline char * 68 kstrndup(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