The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/libkern.h

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    1 /*-
    2  * Copyright (c) 1992, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)libkern.h   8.1 (Berkeley) 6/10/93
   30  * $FreeBSD$
   31  */
   32 
   33 #ifndef _SYS_LIBKERN_H_
   34 #define _SYS_LIBKERN_H_
   35 
   36 #include <sys/cdefs.h>
   37 #include <sys/types.h>
   38 #ifdef _KERNEL
   39 #include <sys/systm.h>
   40 #endif
   41 
   42 #ifndef LIBKERN_INLINE
   43 #define LIBKERN_INLINE  static __inline
   44 #define LIBKERN_BODY
   45 #endif
   46 
   47 /* BCD conversions. */
   48 extern u_char const     bcd2bin_data[];
   49 extern u_char const     bin2bcd_data[];
   50 extern char const       hex2ascii_data[];
   51 
   52 #define bcd2bin(bcd)    (bcd2bin_data[bcd])
   53 #define bin2bcd(bin)    (bin2bcd_data[bin])
   54 #define hex2ascii(hex)  (hex2ascii_data[hex])
   55 
   56 static inline bool
   57 validbcd(int bcd)
   58 {
   59 
   60         return (bcd == 0 || (bcd > 0 && bcd <= 0x99 && bcd2bin_data[bcd] != 0));
   61 }
   62 
   63 static __inline int imax(int a, int b) { return (a > b ? a : b); }
   64 static __inline int imin(int a, int b) { return (a < b ? a : b); }
   65 static __inline long lmax(long a, long b) { return (a > b ? a : b); }
   66 static __inline long lmin(long a, long b) { return (a < b ? a : b); }
   67 static __inline u_int max(u_int a, u_int b) { return (a > b ? a : b); }
   68 static __inline u_int min(u_int a, u_int b) { return (a < b ? a : b); }
   69 static __inline quad_t qmax(quad_t a, quad_t b) { return (a > b ? a : b); }
   70 static __inline quad_t qmin(quad_t a, quad_t b) { return (a < b ? a : b); }
   71 static __inline u_quad_t uqmax(u_quad_t a, u_quad_t b) { return (a > b ? a : b); }
   72 static __inline u_quad_t uqmin(u_quad_t a, u_quad_t b) { return (a < b ? a : b); }
   73 static __inline u_long ulmax(u_long a, u_long b) { return (a > b ? a : b); }
   74 static __inline u_long ulmin(u_long a, u_long b) { return (a < b ? a : b); }
   75 static __inline __uintmax_t ummax(__uintmax_t a, __uintmax_t b)
   76 {
   77 
   78         return (a > b ? a : b);
   79 }
   80 static __inline __uintmax_t ummin(__uintmax_t a, __uintmax_t b)
   81 {
   82 
   83         return (a < b ? a : b);
   84 }
   85 static __inline off_t omax(off_t a, off_t b) { return (a > b ? a : b); }
   86 static __inline off_t omin(off_t a, off_t b) { return (a < b ? a : b); }
   87 
   88 static __inline int abs(int a) { return (a < 0 ? -a : a); }
   89 static __inline long labs(long a) { return (a < 0 ? -a : a); }
   90 static __inline quad_t qabs(quad_t a) { return (a < 0 ? -a : a); }
   91 
   92 #define ARC4_ENTR_NONE  0       /* Don't have entropy yet. */
   93 #define ARC4_ENTR_HAVE  1       /* Have entropy. */
   94 #define ARC4_ENTR_SEED  2       /* Reseeding. */
   95 extern int arc4rand_iniseed_state;
   96 
   97 /* Prototypes for non-quad routines. */
   98 struct malloc_type;
   99 uint32_t arc4random(void);
  100 void     arc4rand(void *ptr, u_int len, int reseed);
  101 int      bcmp(const void *, const void *, size_t);
  102 int      timingsafe_bcmp(const void *, const void *, size_t);
  103 void    *bsearch(const void *, const void *, size_t,
  104             size_t, int (*)(const void *, const void *));
  105 #ifndef HAVE_INLINE_FFS
  106 int      ffs(int);
  107 #endif
  108 #ifndef HAVE_INLINE_FFSL
  109 int      ffsl(long);
  110 #endif
  111 #ifndef HAVE_INLINE_FFSLL
  112 int      ffsll(long long);
  113 #endif
  114 #ifndef HAVE_INLINE_FLS
  115 int      fls(int);
  116 #endif
  117 #ifndef HAVE_INLINE_FLSL
  118 int      flsl(long);
  119 #endif
  120 #ifndef HAVE_INLINE_FLSLL
  121 int      flsll(long long);
  122 #endif
  123 #define bitcount64(x)   __bitcount64((uint64_t)(x))
  124 #define bitcount32(x)   __bitcount32((uint32_t)(x))
  125 #define bitcount16(x)   __bitcount16((uint16_t)(x))
  126 #define bitcountl(x)    __bitcountl((u_long)(x))
  127 #define bitcount(x)     __bitcount((u_int)(x))
  128 
  129 int      fnmatch(const char *, const char *, int);
  130 int      locc(int, char *, u_int);
  131 void    *memchr(const void *s, int c, size_t n);
  132 void    *memcchr(const void *s, int c, size_t n);
  133 int      memcmp(const void *b1, const void *b2, size_t len);
  134 void    *memmem(const void *l, size_t l_len, const void *s, size_t s_len);
  135 void     qsort(void *base, size_t nmemb, size_t size,
  136             int (*compar)(const void *, const void *));
  137 void     qsort_r(void *base, size_t nmemb, size_t size, void *thunk,
  138             int (*compar)(void *, const void *, const void *));
  139 u_long   random(void);
  140 int      scanc(u_int, const u_char *, const u_char *, int);
  141 void     srandom(u_long);
  142 int      strcasecmp(const char *, const char *);
  143 char    *strcat(char * __restrict, const char * __restrict);
  144 char    *strchr(const char *, int);
  145 int      strcmp(const char *, const char *);
  146 char    *strcpy(char * __restrict, const char * __restrict);
  147 size_t   strcspn(const char * __restrict, const char * __restrict) __pure;
  148 char    *strdup(const char *__restrict, struct malloc_type *);
  149 char    *strncat(char *, const char *, size_t);
  150 char    *strndup(const char *__restrict, size_t, struct malloc_type *);
  151 size_t   strlcat(char *, const char *, size_t);
  152 size_t   strlcpy(char *, const char *, size_t);
  153 size_t   strlen(const char *);
  154 int      strncasecmp(const char *, const char *, size_t);
  155 int      strncmp(const char *, const char *, size_t);
  156 char    *strncpy(char * __restrict, const char * __restrict, size_t);
  157 size_t   strnlen(const char *, size_t);
  158 char    *strrchr(const char *, int);
  159 char    *strsep(char **, const char *delim);
  160 size_t   strspn(const char *, const char *);
  161 char    *strstr(const char *, const char *);
  162 int      strvalid(const char *, size_t);
  163 
  164 extern const uint32_t crc32_tab[];
  165 
  166 static __inline uint32_t
  167 crc32_raw(const void *buf, size_t size, uint32_t crc)
  168 {
  169         const uint8_t *p = (const uint8_t *)buf;
  170 
  171         while (size--)
  172                 crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
  173         return (crc);
  174 }
  175 
  176 static __inline uint32_t
  177 crc32(const void *buf, size_t size)
  178 {
  179         uint32_t crc;
  180 
  181         crc = crc32_raw(buf, size, ~0U);
  182         return (crc ^ ~0U);
  183 }
  184 
  185 uint32_t
  186 calculate_crc32c(uint32_t crc32c, const unsigned char *buffer,
  187     unsigned int length);
  188 #ifdef _KERNEL
  189 #if defined(__amd64__) || defined(__i386__)
  190 uint32_t sse42_crc32c(uint32_t, const unsigned char *, unsigned);
  191 #endif
  192 #if defined(__aarch64__)
  193 uint32_t armv8_crc32c(uint32_t, const unsigned char *, unsigned int);
  194 #endif
  195 #endif
  196 
  197 
  198 LIBKERN_INLINE void *memset(void *, int, size_t);
  199 #ifdef LIBKERN_BODY
  200 LIBKERN_INLINE void *
  201 memset(void *b, int c, size_t len)
  202 {
  203         char *bb;
  204 
  205         if (c == 0)
  206                 bzero(b, len);
  207         else
  208                 for (bb = (char *)b; len--; )
  209                         *bb++ = c;
  210         return (b);
  211 }
  212 #endif
  213 
  214 static __inline char *
  215 index(const char *p, int ch)
  216 {
  217 
  218         return (strchr(p, ch));
  219 }
  220 
  221 static __inline char *
  222 rindex(const char *p, int ch)
  223 {
  224 
  225         return (strrchr(p, ch));
  226 }
  227 
  228 /* fnmatch() return values. */
  229 #define FNM_NOMATCH     1       /* Match failed. */
  230 
  231 /* fnmatch() flags. */
  232 #define FNM_NOESCAPE    0x01    /* Disable backslash escaping. */
  233 #define FNM_PATHNAME    0x02    /* Slash must be matched by slash. */
  234 #define FNM_PERIOD      0x04    /* Period must be matched by period. */
  235 #define FNM_LEADING_DIR 0x08    /* Ignore /<tail> after Imatch. */
  236 #define FNM_CASEFOLD    0x10    /* Case insensitive search. */
  237 #define FNM_IGNORECASE  FNM_CASEFOLD
  238 #define FNM_FILE_NAME   FNM_PATHNAME
  239 
  240 #endif /* !_SYS_LIBKERN_H_ */

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