LXR linux/include/linux/string.h

   1#ifndef _LINUX_STRING_H_
   2#define _LINUX_STRING_H_
   3
   4
   5#include <linux/compiler.h>     /* for inline */
   6#include <linux/types.h>        /* for size_t */
   7#include <linux/stddef.h>       /* for NULL */
   8#include <stdarg.h>
   9#include <uapi/linux/string.h>
  10
  11extern char *strndup_user(const char __user *, long);
  12extern void *memdup_user(const void __user *, size_t);
  13extern void *memdup_user_nul(const void __user *, size_t);
  14
  15/*
  16 * Include machine specific inline routines
  17 */
  18#include <asm/string.h>
  19
  20#ifndef __HAVE_ARCH_STRCPY
  21extern char * strcpy(char *,const char *);
  22#endif
  23#ifndef __HAVE_ARCH_STRNCPY
  24extern char * strncpy(char *,const char *, __kernel_size_t);
  25#endif
  26#ifndef __HAVE_ARCH_STRLCPY
  27size_t strlcpy(char *, const char *, size_t);
  28#endif
  29#ifndef __HAVE_ARCH_STRCAT
  30extern char * strcat(char *, const char *);
  31#endif
  32#ifndef __HAVE_ARCH_STRNCAT
  33extern char * strncat(char *, const char *, __kernel_size_t);
  34#endif
  35#ifndef __HAVE_ARCH_STRLCAT
  36extern size_t strlcat(char *, const char *, __kernel_size_t);
  37#endif
  38#ifndef __HAVE_ARCH_STRCMP
  39extern int strcmp(const char *,const char *);
  40#endif
  41#ifndef __HAVE_ARCH_STRNCMP
  42extern int strncmp(const char *,const char *,__kernel_size_t);
  43#endif
  44#ifndef __HAVE_ARCH_STRNICMP
  45extern int strnicmp(const char *, const char *, __kernel_size_t);
  46#endif
  47#ifndef __HAVE_ARCH_STRCASECMP
  48extern int strcasecmp(const char *s1, const char *s2);
  49#endif
  50#ifndef __HAVE_ARCH_STRNCASECMP
  51extern int strncasecmp(const char *s1, const char *s2, size_t n);
  52#endif
  53#ifndef __HAVE_ARCH_STRCHR
  54extern char * strchr(const char *,int);
  55#endif
  56#ifndef __HAVE_ARCH_STRCHRNUL
  57extern char * strchrnul(const char *,int);
  58#endif
  59#ifndef __HAVE_ARCH_STRNCHR
  60extern char * strnchr(const char *, size_t, int);
  61#endif
  62#ifndef __HAVE_ARCH_STRRCHR
  63extern char * strrchr(const char *,int);
  64#endif
  65extern char * __must_check skip_spaces(const char *);
  66
  67extern char *strim(char *);
  68
  69static inline __must_check char *strstrip(char *str)
  70{
  71        return strim(str);
  72}
  73
  74#ifndef __HAVE_ARCH_STRSTR
  75extern char * strstr(const char *, const char *);
  76#endif
  77#ifndef __HAVE_ARCH_STRNSTR
  78extern char * strnstr(const char *, const char *, size_t);
  79#endif
  80#ifndef __HAVE_ARCH_STRLEN
  81extern __kernel_size_t strlen(const char *);
  82#endif
  83#ifndef __HAVE_ARCH_STRNLEN
  84extern __kernel_size_t strnlen(const char *,__kernel_size_t);
  85#endif
  86#ifndef __HAVE_ARCH_STRPBRK
  87extern char * strpbrk(const char *,const char *);
  88#endif
  89#ifndef __HAVE_ARCH_STRSEP
  90extern char * strsep(char **,const char *);
  91#endif
  92#ifndef __HAVE_ARCH_STRSPN
  93extern __kernel_size_t strspn(const char *,const char *);
  94#endif
  95#ifndef __HAVE_ARCH_STRCSPN
  96extern __kernel_size_t strcspn(const char *,const char *);
  97#endif
  98
  99#ifndef __HAVE_ARCH_MEMSET
 100extern void * memset(void *,int,__kernel_size_t);
 101#endif
 102
 103#ifndef __HAVE_ARCH_MEMSET16
 104extern void *memset16(uint16_t *, uint16_t, __kernel_size_t);
 105#endif
 106
 107#ifndef __HAVE_ARCH_MEMSET32
 108extern void *memset32(uint32_t *, uint32_t, __kernel_size_t);
 109#endif
 110
 111#ifndef __HAVE_ARCH_MEMSET64
 112extern void *memset64(uint64_t *, uint64_t, __kernel_size_t);
 113#endif
 114
 115static inline void *memset_l(unsigned long *p, unsigned long v,
 116                __kernel_size_t n)
 117{
 118        if (BITS_PER_LONG == 32)
 119                return memset32((uint32_t *)p, v, n);
 120        else
 121                return memset64((uint64_t *)p, v, n);
 122}
 123
 124static inline void *memset_p(void **p, void *v, __kernel_size_t n)
 125{
 126        if (BITS_PER_LONG == 32)
 127                return memset32((uint32_t *)p, (uintptr_t)v, n);
 128        else
 129                return memset64((uint64_t *)p, (uintptr_t)v, n);
 130}
 131
 132#ifndef __HAVE_ARCH_MEMCPY
 133extern void * memcpy(void *,const void *,__kernel_size_t);
 134#endif
 135#ifndef __HAVE_ARCH_MEMMOVE
 136extern void * memmove(void *,const void *,__kernel_size_t);
 137#endif
 138#ifndef __HAVE_ARCH_MEMSCAN
 139extern void * memscan(void *,int,__kernel_size_t);
 140#endif
 141#ifndef __HAVE_ARCH_MEMCMP
 142extern int memcmp(const void *,const void *,__kernel_size_t);
 143#endif
 144#ifndef __HAVE_ARCH_MEMCHR
 145extern void * memchr(const void *,int,__kernel_size_t);
 146#endif
 147#ifndef __HAVE_ARCH_MEMCPY_MCSAFE
 148static inline __must_check unsigned long memcpy_mcsafe(void *dst,
 149                const void *src, size_t cnt)
 150{
 151        memcpy(dst, src, cnt);
 152        return 0;
 153}
 154#endif
 155#ifndef __HAVE_ARCH_MEMCPY_FLUSHCACHE
 156static inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
 157{
 158        memcpy(dst, src, cnt);
 159}
 160#endif
 161void *memchr_inv(const void *s, int c, size_t n);
 162
 163extern void kfree_const(const void *x);
 164
 165extern char *kstrdup(const char *s, gfp_t gfp);
 166extern const char *kstrdup_const(const char *s, gfp_t gfp);
 167extern char *kstrndup(const char *s, size_t len, gfp_t gfp);
 168extern void *kmemdup(const void *src, size_t len, gfp_t gfp);
 169
 170extern char **argv_split(gfp_t gfp, const char *str, int *argcp);
 171extern void argv_free(char **argv);
 172
 173extern bool sysfs_streq(const char *s1, const char *s2);
 174extern int kstrtobool(const char *s, bool *res);
 175static inline int strtobool(const char *s, bool *res)
 176{
 177        return kstrtobool(s, res);
 178}
 179
 180int match_string(const char * const *array, size_t n, const char *string);
 181int __sysfs_match_string(const char * const *array, size_t n, const char *s);
 182
 183/**
 184 * sysfs_match_string - matches given string in an array
 185 * @_a: array of strings
 186 * @_s: string to match with
 187 *
 188 * Helper for __sysfs_match_string(). Calculates the size of @a automatically.
 189 */
 190#define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s)
 191
 192#ifdef CONFIG_BINARY_PRINTF
 193int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
 194int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf);
 195int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) __printf(3, 4);
 196#endif
 197
 198extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
 199                                       const void *from, size_t available);
 200
 201/**
 202 * strstarts - does @str start with @prefix?
 203 * @str: string to examine
 204 * @prefix: prefix to look for.
 205 */
 206static inline bool strstarts(const char *str, const char *prefix)
 207{
 208        return strncmp(str, prefix, strlen(prefix)) == 0;
 209}
 210
 211size_t memweight(const void *ptr, size_t bytes);
 212void memzero_explicit(void *s, size_t count);
 213
 214/**
 215 * kbasename - return the last part of a pathname.
 216 *
 217 * @path: path to extract the filename from.
 218 */
 219static inline const char *kbasename(const char *path)
 220{
 221        const char *tail = strrchr(path, '/');
 222        return tail ? tail + 1 : path;
 223}
 224
 225#endif /* _LINUX_STRING_H_ */
 226