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
  11 extern char *strndup_user(const char __user *, long);
  12 extern void *memdup_user(const void __user *, size_t);
  13
  14 /*
  15  * Include machine specific inline routines
  16  */
  17 #include <asm/string.h>
  18
  19 #ifndef __HAVE_ARCH_STRCPY
  20 extern char * strcpy(char *,const char *);
  21 #endif
  22 #ifndef __HAVE_ARCH_STRNCPY
  23 extern char * strncpy(char *,const char *, __kernel_size_t);
  24 #endif
  25 #ifndef __HAVE_ARCH_STRLCPY
  26 size_t strlcpy(char *, const char *, size_t);
  27 #endif
  28 #ifndef __HAVE_ARCH_STRCAT
  29 extern char * strcat(char *, const char *);
  30 #endif
  31 #ifndef __HAVE_ARCH_STRNCAT
  32 extern char * strncat(char *, const char *, __kernel_size_t);
  33 #endif
  34 #ifndef __HAVE_ARCH_STRLCAT
  35 extern size_t strlcat(char *, const char *, __kernel_size_t);
  36 #endif
  37 #ifndef __HAVE_ARCH_STRCMP
  38 extern int strcmp(const char *,const char *);
  39 #endif
  40 #ifndef __HAVE_ARCH_STRNCMP
  41 extern int strncmp(const char *,const char *,__kernel_size_t);
  42 #endif
  43 #ifndef __HAVE_ARCH_STRCASECMP
  44 extern int strcasecmp(const char *s1, const char *s2);
  45 #endif
  46 #ifndef __HAVE_ARCH_STRNCASECMP
  47 extern int strncasecmp(const char *s1, const char *s2, size_t n);
  48 #endif
  49 #ifndef __HAVE_ARCH_STRCHR
  50 extern char * strchr(const char *,int);
  51 #endif
  52 #ifndef __HAVE_ARCH_STRCHRNUL
  53 extern char * strchrnul(const char *,int);
  54 #endif
  55 #ifndef __HAVE_ARCH_STRNCHR
  56 extern char * strnchr(const char *, size_t, int);
  57 #endif
  58 #ifndef __HAVE_ARCH_STRRCHR
  59 extern char * strrchr(const char *,int);
  60 #endif
  61 extern char * __must_check skip_spaces(const char *);
  62
  63 extern char *strim(char *);
  64
  65 static inline __must_check char *strstrip(char *str)
  66 {
  67         return strim(str);
  68 }
  69
  70 #ifndef __HAVE_ARCH_STRSTR
  71 extern char * strstr(const char *, const char *);
  72 #endif
  73 #ifndef __HAVE_ARCH_STRNSTR
  74 extern char * strnstr(const char *, const char *, size_t);
  75 #endif
  76 #ifndef __HAVE_ARCH_STRLEN
  77 extern __kernel_size_t strlen(const char *);
  78 #endif
  79 #ifndef __HAVE_ARCH_STRNLEN
  80 extern __kernel_size_t strnlen(const char *,__kernel_size_t);
  81 #endif
  82 #ifndef __HAVE_ARCH_STRPBRK
  83 extern char * strpbrk(const char *,const char *);
  84 #endif
  85 #ifndef __HAVE_ARCH_STRSEP
  86 extern char * strsep(char **,const char *);
  87 #endif
  88 #ifndef __HAVE_ARCH_STRSPN
  89 extern __kernel_size_t strspn(const char *,const char *);
  90 #endif
  91 #ifndef __HAVE_ARCH_STRCSPN
  92 extern __kernel_size_t strcspn(const char *,const char *);
  93 #endif
  94
  95 #ifndef __HAVE_ARCH_MEMSET
  96 extern void * memset(void *,int,__kernel_size_t);
  97 #endif
  98 #ifndef __HAVE_ARCH_MEMCPY
  99 extern void * memcpy(void *,const void *,__kernel_size_t);
 100 #endif
 101 #ifndef __HAVE_ARCH_MEMMOVE
 102 extern void * memmove(void *,const void *,__kernel_size_t);
 103 #endif
 104 #ifndef __HAVE_ARCH_MEMSCAN
 105 extern void * memscan(void *,int,__kernel_size_t);
 106 #endif
 107 #ifndef __HAVE_ARCH_MEMCMP
 108 extern int memcmp(const void *,const void *,__kernel_size_t);
 109 #endif
 110 #ifndef __HAVE_ARCH_MEMCHR
 111 extern void * memchr(const void *,int,__kernel_size_t);
 112 #endif
 113 void *memchr_inv(const void *s, int c, size_t n);
 114
 115 extern void kfree_const(const void *x);
 116
 117 extern char *kstrdup(const char *s, gfp_t gfp);
 118 extern const char *kstrdup_const(const char *s, gfp_t gfp);
 119 extern char *kstrndup(const char *s, size_t len, gfp_t gfp);
 120 extern void *kmemdup(const void *src, size_t len, gfp_t gfp);
 121
 122 extern char **argv_split(gfp_t gfp, const char *str, int *argcp);
 123 extern void argv_free(char **argv);
 124
 125 extern bool sysfs_streq(const char *s1, const char *s2);
 126 extern int strtobool(const char *s, bool *res);
 127
 128 #ifdef CONFIG_BINARY_PRINTF
 129 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
 130 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf);
 131 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) __printf(3, 4);
 132 #endif
 133
 134 extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
 135                                        const void *from, size_t available);
 136
 137 /**
 138  * strstarts - does @str start with @prefix?
 139  * @str: string to examine
 140  * @prefix: prefix to look for.
 141  */
 142 static inline bool strstarts(const char *str, const char *prefix)
 143 {
 144         return strncmp(str, prefix, strlen(prefix)) == 0;
 145 }
 146
 147 size_t memweight(const void *ptr, size_t bytes);
 148 void memzero_explicit(void *s, size_t count);
 149
 150 /**
 151  * kbasename - return the last part of a pathname.
 152  *
 153  * @path: path to extract the filename from.
 154  */
 155 static inline const char *kbasename(const char *path)
 156 {
 157         const char *tail = strrchr(path, '/');
 158         return tail ? tail + 1 : path;
 159 }
 160
 161 #endif /* _LINUX_STRING_H_ */