include/linux/string.h

   1 #ifndef _LINUX_STRING_H_
   2 #define _LINUX_STRING_H_
   3
   4 /* We don't want strings.h stuff being used by user stuff by accident */
   5
   6 #ifndef __KERNEL__
   7 #include <string.h>
   8 #else
   9
  10 #include <linux/compiler.h>     /* for inline */
  11 #include <linux/types.h>        /* for size_t */
  12 #include <linux/stddef.h>       /* for NULL */
  13 #include <stdarg.h>
  14
  15 extern char *strndup_user(const char __user *, long);
  16 extern void *memdup_user(const void __user *, size_t);
  17
  18 /*
  19  * Include machine specific inline routines
  20  */
  21 #include <asm/string.h>
  22
  23 #ifndef __HAVE_ARCH_STRCPY
  24 extern char * strcpy(char *,const char *);
  25 #endif
  26 #ifndef __HAVE_ARCH_STRNCPY
  27 extern char * strncpy(char *,const char *, __kernel_size_t);
  28 #endif
  29 #ifndef __HAVE_ARCH_STRLCPY
  30 size_t strlcpy(char *, const char *, size_t);
  31 #endif
  32 #ifndef __HAVE_ARCH_STRCAT
  33 extern char * strcat(char *, const char *);
  34 #endif
  35 #ifndef __HAVE_ARCH_STRNCAT
  36 extern char * strncat(char *, const char *, __kernel_size_t);
  37 #endif
  38 #ifndef __HAVE_ARCH_STRLCAT
  39 extern size_t strlcat(char *, const char *, __kernel_size_t);
  40 #endif
  41 #ifndef __HAVE_ARCH_STRCMP
  42 extern int strcmp(const char *,const char *);
  43 #endif
  44 #ifndef __HAVE_ARCH_STRNCMP
  45 extern int strncmp(const char *,const char *,__kernel_size_t);
  46 #endif
  47 #ifndef __HAVE_ARCH_STRNICMP
  48 extern int strnicmp(const char *, const char *, __kernel_size_t);
  49 #endif
  50 #ifndef __HAVE_ARCH_STRCASECMP
  51 extern int strcasecmp(const char *s1, const char *s2);
  52 #endif
  53 #ifndef __HAVE_ARCH_STRNCASECMP
  54 extern int strncasecmp(const char *s1, const char *s2, size_t n);
  55 #endif
  56 #ifndef __HAVE_ARCH_STRCHR
  57 extern char * strchr(const char *,int);
  58 #endif
  59 #ifndef __HAVE_ARCH_STRNCHR
  60 extern char * strnchr(const char *, size_t, int);
  61 #endif
  62 #ifndef __HAVE_ARCH_STRRCHR
  63 extern char * strrchr(const char *,int);
  64 #endif
  65 extern char * __must_check skip_spaces(const char *);
  66
  67 extern char *strim(char *);
  68
  69 static inline __must_check char *strstrip(char *str)
  70 {
  71         return strim(str);
  72 }
  73
  74 #ifndef __HAVE_ARCH_STRSTR
  75 extern char * strstr(const char *, const char *);
  76 #endif
  77 #ifndef __HAVE_ARCH_STRNSTR
  78 extern char * strnstr(const char *, const char *, size_t);
  79 #endif
  80 #ifndef __HAVE_ARCH_STRLEN
  81 extern __kernel_size_t strlen(const char *);
  82 #endif
  83 #ifndef __HAVE_ARCH_STRNLEN
  84 extern __kernel_size_t strnlen(const char *,__kernel_size_t);
  85 #endif
  86 #ifndef __HAVE_ARCH_STRPBRK
  87 extern char * strpbrk(const char *,const char *);
  88 #endif
  89 #ifndef __HAVE_ARCH_STRSEP
  90 extern char * strsep(char **,const char *);
  91 #endif
  92 #ifndef __HAVE_ARCH_STRSPN
  93 extern __kernel_size_t strspn(const char *,const char *);
  94 #endif
  95 #ifndef __HAVE_ARCH_STRCSPN
  96 extern __kernel_size_t strcspn(const char *,const char *);
  97 #endif
  98
  99 #ifndef __HAVE_ARCH_MEMSET
 100 extern void * memset(void *,int,__kernel_size_t);
 101 #endif
 102 #ifndef __HAVE_ARCH_MEMCPY
 103 extern void * memcpy(void *,const void *,__kernel_size_t);
 104 #endif
 105 #ifndef __HAVE_ARCH_MEMMOVE
 106 extern void * memmove(void *,const void *,__kernel_size_t);
 107 #endif
 108 #ifndef __HAVE_ARCH_MEMSCAN
 109 extern void * memscan(void *,int,__kernel_size_t);
 110 #endif
 111 #ifndef __HAVE_ARCH_MEMCMP
 112 extern int memcmp(const void *,const void *,__kernel_size_t);
 113 #endif
 114 #ifndef __HAVE_ARCH_MEMCHR
 115 extern void * memchr(const void *,int,__kernel_size_t);
 116 #endif
 117
 118 extern char *kstrdup(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
 127 #ifdef CONFIG_BINARY_PRINTF
 128 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
 129 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf);
 130 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) __printf(3, 4);
 131 #endif
 132
 133 extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
 134                         const void *from, size_t available);
 135
 136 /**
 137  * strstarts - does @str start with @prefix?
 138  * @str: string to examine
 139  * @prefix: prefix to look for.
 140  */
 141 static inline bool strstarts(const char *str, const char *prefix)
 142 {
 143         return strncmp(str, prefix, strlen(prefix)) == 0;
 144 }
 145 #endif
 146 #endif /* _LINUX_STRING_H_ */