1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2017 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 #ifndef _LINUXKPI_LINUX_STRING_H_ 32 #define _LINUXKPI_LINUX_STRING_H_ 33 34 #include <sys/ctype.h> 35 36 #include <linux/types.h> 37 #include <linux/gfp.h> 38 #include <linux/slab.h> 39 #include <linux/uaccess.h> 40 #include <linux/err.h> 41 #include <linux/bitops.h> /* for BITS_PER_LONG */ 42 43 #include <sys/libkern.h> 44 45 #define strnicmp(...) strncasecmp(__VA_ARGS__) 46 47 static inline int 48 match_string(const char *const *table, int n, const char *key) 49 { 50 int i; 51 52 for (i = 0; i != n && table[i] != NULL; i++) { 53 if (strcmp(table[i], key) == 0) 54 return (i); 55 } 56 return (-EINVAL); 57 } 58 59 static inline void * 60 memdup_user(const void *ptr, size_t len) 61 { 62 void *retval; 63 int error; 64 65 retval = malloc(len, M_KMALLOC, M_WAITOK); 66 error = linux_copyin(ptr, retval, len); 67 if (error != 0) { 68 free(retval, M_KMALLOC); 69 return (ERR_PTR(error)); 70 } 71 return (retval); 72 } 73 74 static inline void * 75 memdup_user_nul(const void *ptr, size_t len) 76 { 77 char *retval; 78 int error; 79 80 retval = malloc(len + 1, M_KMALLOC, M_WAITOK); 81 error = linux_copyin(ptr, retval, len); 82 if (error != 0) { 83 free(retval, M_KMALLOC); 84 return (ERR_PTR(error)); 85 } 86 retval[len] = '\0'; 87 return (retval); 88 } 89 90 static inline void * 91 kmemdup(const void *src, size_t len, gfp_t gfp) 92 { 93 void *dst; 94 95 dst = kmalloc(len, gfp); 96 if (dst != NULL) 97 memcpy(dst, src, len); 98 return (dst); 99 } 100 101 static inline char * 102 strndup_user(const char __user *ustr, long n) 103 { 104 if (n < 1) 105 return (ERR_PTR(-EINVAL)); 106 107 return (memdup_user_nul(ustr, n - 1)); 108 } 109 110 static inline char * 111 kstrdup(const char *string, gfp_t gfp) 112 { 113 char *retval; 114 size_t len; 115 116 if (string == NULL) 117 return (NULL); 118 len = strlen(string) + 1; 119 retval = kmalloc(len, gfp); 120 if (retval != NULL) 121 memcpy(retval, string, len); 122 return (retval); 123 } 124 125 static inline char * 126 kstrndup(const char *string, size_t len, gfp_t gfp) 127 { 128 char *retval; 129 130 if (string == NULL) 131 return (NULL); 132 retval = kmalloc(len + 1, gfp); 133 if (retval != NULL) 134 strncpy(retval, string, len); 135 return (retval); 136 } 137 138 static inline const char * 139 kstrdup_const(const char *src, gfp_t gfp) 140 { 141 return (kmemdup(src, strlen(src) + 1, gfp)); 142 } 143 144 static inline char * 145 skip_spaces(const char *str) 146 { 147 while (isspace(*str)) 148 ++str; 149 return (__DECONST(char *, str)); 150 } 151 152 static inline void * 153 memchr_inv(const void *start, int c, size_t length) 154 { 155 const u8 *ptr; 156 const u8 *end; 157 u8 ch; 158 159 ch = c; 160 ptr = start; 161 end = ptr + length; 162 163 while (ptr != end) { 164 if (*ptr != ch) 165 return (__DECONST(void *, ptr)); 166 ptr++; 167 } 168 return (NULL); 169 } 170 171 static inline size_t 172 str_has_prefix(const char *str, const char *prefix) 173 { 174 size_t len; 175 176 len = strlen(prefix); 177 return (strncmp(str, prefix, len) == 0 ? len : 0); 178 } 179 180 static inline char * 181 strreplace(char *str, char old, char new) 182 { 183 char *p; 184 185 p = strchrnul(str, old); 186 while (p != NULL && *p != '\0') { 187 *p = new; 188 p = strchrnul(str, old); 189 } 190 return (p); 191 } 192 193 static inline ssize_t 194 strscpy(char* dst, const char* src, size_t len) 195 { 196 size_t i; 197 198 if (len <= INT_MAX) { 199 for (i = 0; i < len; i++) 200 if ('\0' == (dst[i] = src[i])) 201 return ((ssize_t)i); 202 if (i != 0) 203 dst[--i] = '\0'; 204 } 205 206 return (-E2BIG); 207 } 208 209 static inline void * 210 memset32(uint32_t *b, uint32_t c, size_t len) 211 { 212 uint32_t *dst = b; 213 214 while (len--) 215 *dst++ = c; 216 return (b); 217 } 218 219 static inline void * 220 memset64(uint64_t *b, uint64_t c, size_t len) 221 { 222 uint64_t *dst = b; 223 224 while (len--) 225 *dst++ = c; 226 return (b); 227 } 228 229 static inline void * 230 memset_p(void **p, void *v, size_t n) 231 { 232 233 if (BITS_PER_LONG == 32) 234 return (memset32((uint32_t *)p, (uintptr_t)v, n)); 235 else 236 return (memset64((uint64_t *)p, (uintptr_t)v, n)); 237 } 238 239 static inline void 240 memcpy_and_pad(void *dst, size_t dstlen, const void *src, size_t len, int ch) 241 { 242 243 if (len >= dstlen) { 244 memcpy(dst, src, dstlen); 245 } else { 246 memcpy(dst, src, len); 247 /* Pad with given padding character. */ 248 memset((char *)dst + len, ch, dstlen - len); 249 } 250 } 251 252 #define memset_startat(ptr, bytepat, smember) \ 253 ({ \ 254 uint8_t *_ptr = (uint8_t *)(ptr); \ 255 int _c = (int)(bytepat); \ 256 size_t _o = offsetof(typeof(*(ptr)), smember); \ 257 memset(_ptr + _o, _c, sizeof(*(ptr)) - _o); \ 258 }) 259 260 #endif /* _LINUXKPI_LINUX_STRING_H_ */ 261