364 lines
11 KiB
C
364 lines
11 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef _LINUX_STRING_H_
|
||
|
|
#define _LINUX_STRING_H_
|
||
|
|
|
||
|
|
#include <linux/compiler.h> /* for inline */
|
||
|
|
#include <linux/types.h> /* for size_t */
|
||
|
|
#include <linux/stddef.h> /* for NULL */
|
||
|
|
#include <linux/errno.h> /* for E2BIG */
|
||
|
|
#include <linux/stdarg.h>
|
||
|
|
#include <uapi/linux/string.h>
|
||
|
|
|
||
|
|
extern char *strndup_user(const char __user *, long);
|
||
|
|
extern void *memdup_user(const void __user *, size_t);
|
||
|
|
extern void *vmemdup_user(const void __user *, size_t);
|
||
|
|
extern void *memdup_user_nul(const void __user *, size_t);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Include machine specific inline routines
|
||
|
|
*/
|
||
|
|
#include <asm/string.h>
|
||
|
|
|
||
|
|
#ifndef __HAVE_ARCH_STRCPY
|
||
|
|
extern char * strcpy(char *,const char *);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRNCPY
|
||
|
|
extern char * strncpy(char *,const char *, __kernel_size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRLCPY
|
||
|
|
size_t strlcpy(char *, const char *, size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRSCPY
|
||
|
|
ssize_t strscpy(char *, const char *, size_t);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Wraps calls to strscpy()/memset(), no arch specific code required */
|
||
|
|
ssize_t strscpy_pad(char *dest, const char *src, size_t count);
|
||
|
|
|
||
|
|
#ifndef __HAVE_ARCH_STRCAT
|
||
|
|
extern char * strcat(char *, const char *);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRNCAT
|
||
|
|
extern char * strncat(char *, const char *, __kernel_size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRLCAT
|
||
|
|
extern size_t strlcat(char *, const char *, __kernel_size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRCMP
|
||
|
|
extern int strcmp(const char *,const char *);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRNCMP
|
||
|
|
extern int strncmp(const char *,const char *,__kernel_size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRCASECMP
|
||
|
|
extern int strcasecmp(const char *s1, const char *s2);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRNCASECMP
|
||
|
|
extern int strncasecmp(const char *s1, const char *s2, size_t n);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRCHR
|
||
|
|
extern char * strchr(const char *,int);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRCHRNUL
|
||
|
|
extern char * strchrnul(const char *,int);
|
||
|
|
#endif
|
||
|
|
extern char * strnchrnul(const char *, size_t, int);
|
||
|
|
#ifndef __HAVE_ARCH_STRNCHR
|
||
|
|
extern char * strnchr(const char *, size_t, int);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRRCHR
|
||
|
|
extern char * strrchr(const char *,int);
|
||
|
|
#endif
|
||
|
|
extern char * __must_check skip_spaces(const char *);
|
||
|
|
|
||
|
|
extern char *strim(char *);
|
||
|
|
|
||
|
|
static inline __must_check char *strstrip(char *str)
|
||
|
|
{
|
||
|
|
return strim(str);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifndef __HAVE_ARCH_STRSTR
|
||
|
|
extern char * strstr(const char *, const char *);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRNSTR
|
||
|
|
extern char * strnstr(const char *, const char *, size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRLEN
|
||
|
|
extern __kernel_size_t strlen(const char *);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRNLEN
|
||
|
|
extern __kernel_size_t strnlen(const char *,__kernel_size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRPBRK
|
||
|
|
extern char * strpbrk(const char *,const char *);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRSEP
|
||
|
|
extern char * strsep(char **,const char *);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRSPN
|
||
|
|
extern __kernel_size_t strspn(const char *,const char *);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_STRCSPN
|
||
|
|
extern __kernel_size_t strcspn(const char *,const char *);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __HAVE_ARCH_MEMSET
|
||
|
|
extern void * memset(void *,int,__kernel_size_t);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __HAVE_ARCH_MEMSET16
|
||
|
|
extern void *memset16(uint16_t *, uint16_t, __kernel_size_t);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __HAVE_ARCH_MEMSET32
|
||
|
|
extern void *memset32(uint32_t *, uint32_t, __kernel_size_t);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __HAVE_ARCH_MEMSET64
|
||
|
|
extern void *memset64(uint64_t *, uint64_t, __kernel_size_t);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static inline void *memset_l(unsigned long *p, unsigned long v,
|
||
|
|
__kernel_size_t n)
|
||
|
|
{
|
||
|
|
if (BITS_PER_LONG == 32)
|
||
|
|
return memset32((uint32_t *)p, v, n);
|
||
|
|
else
|
||
|
|
return memset64((uint64_t *)p, v, n);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void *memset_p(void **p, void *v, __kernel_size_t n)
|
||
|
|
{
|
||
|
|
if (BITS_PER_LONG == 32)
|
||
|
|
return memset32((uint32_t *)p, (uintptr_t)v, n);
|
||
|
|
else
|
||
|
|
return memset64((uint64_t *)p, (uintptr_t)v, n);
|
||
|
|
}
|
||
|
|
|
||
|
|
extern void **__memcat_p(void **a, void **b);
|
||
|
|
#define memcat_p(a, b) ({ \
|
||
|
|
BUILD_BUG_ON_MSG(!__same_type(*(a), *(b)), \
|
||
|
|
"type mismatch in memcat_p()"); \
|
||
|
|
(typeof(*a) *)__memcat_p((void **)(a), (void **)(b)); \
|
||
|
|
})
|
||
|
|
|
||
|
|
#ifndef __HAVE_ARCH_MEMCPY
|
||
|
|
extern void * memcpy(void *,const void *,__kernel_size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_MEMMOVE
|
||
|
|
extern void * memmove(void *,const void *,__kernel_size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_MEMSCAN
|
||
|
|
extern void * memscan(void *,int,__kernel_size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_MEMCMP
|
||
|
|
extern int memcmp(const void *,const void *,__kernel_size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_BCMP
|
||
|
|
extern int bcmp(const void *,const void *,__kernel_size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_MEMCHR
|
||
|
|
extern void * memchr(const void *,int,__kernel_size_t);
|
||
|
|
#endif
|
||
|
|
#ifndef __HAVE_ARCH_MEMCPY_FLUSHCACHE
|
||
|
|
static inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
|
||
|
|
{
|
||
|
|
memcpy(dst, src, cnt);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
void *memchr_inv(const void *s, int c, size_t n);
|
||
|
|
char *strreplace(char *s, char old, char new);
|
||
|
|
|
||
|
|
extern void kfree_const(const void *x);
|
||
|
|
|
||
|
|
extern char *kstrdup(const char *s, gfp_t gfp) __malloc;
|
||
|
|
extern const char *kstrdup_const(const char *s, gfp_t gfp);
|
||
|
|
extern char *kstrndup(const char *s, size_t len, gfp_t gfp);
|
||
|
|
extern void *kmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2);
|
||
|
|
extern void *kvmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2);
|
||
|
|
extern char *kmemdup_nul(const char *s, size_t len, gfp_t gfp);
|
||
|
|
|
||
|
|
extern char **argv_split(gfp_t gfp, const char *str, int *argcp);
|
||
|
|
extern void argv_free(char **argv);
|
||
|
|
|
||
|
|
extern bool sysfs_streq(const char *s1, const char *s2);
|
||
|
|
int match_string(const char * const *array, size_t n, const char *string);
|
||
|
|
int __sysfs_match_string(const char * const *array, size_t n, const char *s);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* sysfs_match_string - matches given string in an array
|
||
|
|
* @_a: array of strings
|
||
|
|
* @_s: string to match with
|
||
|
|
*
|
||
|
|
* Helper for __sysfs_match_string(). Calculates the size of @a automatically.
|
||
|
|
*/
|
||
|
|
#define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s)
|
||
|
|
|
||
|
|
#ifdef CONFIG_BINARY_PRINTF
|
||
|
|
int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
|
||
|
|
int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf);
|
||
|
|
int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) __printf(3, 4);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
|
||
|
|
const void *from, size_t available);
|
||
|
|
|
||
|
|
int ptr_to_hashval(const void *ptr, unsigned long *hashval_out);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* strstarts - does @str start with @prefix?
|
||
|
|
* @str: string to examine
|
||
|
|
* @prefix: prefix to look for.
|
||
|
|
*/
|
||
|
|
static inline bool strstarts(const char *str, const char *prefix)
|
||
|
|
{
|
||
|
|
return strncmp(str, prefix, strlen(prefix)) == 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t memweight(const void *ptr, size_t bytes);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* memzero_explicit - Fill a region of memory (e.g. sensitive
|
||
|
|
* keying data) with 0s.
|
||
|
|
* @s: Pointer to the start of the area.
|
||
|
|
* @count: The size of the area.
|
||
|
|
*
|
||
|
|
* Note: usually using memset() is just fine (!), but in cases
|
||
|
|
* where clearing out _local_ data at the end of a scope is
|
||
|
|
* necessary, memzero_explicit() should be used instead in
|
||
|
|
* order to prevent the compiler from optimising away zeroing.
|
||
|
|
*
|
||
|
|
* memzero_explicit() doesn't need an arch-specific version as
|
||
|
|
* it just invokes the one of memset() implicitly.
|
||
|
|
*/
|
||
|
|
static inline void memzero_explicit(void *s, size_t count)
|
||
|
|
{
|
||
|
|
memset(s, 0, count);
|
||
|
|
barrier_data(s);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* kbasename - return the last part of a pathname.
|
||
|
|
*
|
||
|
|
* @path: path to extract the filename from.
|
||
|
|
*/
|
||
|
|
static inline const char *kbasename(const char *path)
|
||
|
|
{
|
||
|
|
const char *tail = strrchr(path, '/');
|
||
|
|
return tail ? tail + 1 : path;
|
||
|
|
}
|
||
|
|
|
||
|
|
#if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE)
|
||
|
|
#include <linux/fortify-string.h>
|
||
|
|
#endif
|
||
|
|
#ifndef unsafe_memcpy
|
||
|
|
#define unsafe_memcpy(dst, src, bytes, justification) \
|
||
|
|
memcpy(dst, src, bytes)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
void memcpy_and_pad(void *dest, size_t dest_len, const void *src, size_t count,
|
||
|
|
int pad);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* strtomem_pad - Copy NUL-terminated string to non-NUL-terminated buffer
|
||
|
|
*
|
||
|
|
* @dest: Pointer of destination character array (marked as __nonstring)
|
||
|
|
* @src: Pointer to NUL-terminated string
|
||
|
|
* @pad: Padding character to fill any remaining bytes of @dest after copy
|
||
|
|
*
|
||
|
|
* This is a replacement for strncpy() uses where the destination is not
|
||
|
|
* a NUL-terminated string, but with bounds checking on the source size, and
|
||
|
|
* an explicit padding character. If padding is not required, use strtomem().
|
||
|
|
*
|
||
|
|
* Note that the size of @dest is not an argument, as the length of @dest
|
||
|
|
* must be discoverable by the compiler.
|
||
|
|
*/
|
||
|
|
#define strtomem_pad(dest, src, pad) do { \
|
||
|
|
const size_t _dest_len = __builtin_object_size(dest, 1); \
|
||
|
|
\
|
||
|
|
BUILD_BUG_ON(!__builtin_constant_p(_dest_len) || \
|
||
|
|
_dest_len == (size_t)-1); \
|
||
|
|
memcpy_and_pad(dest, _dest_len, src, strnlen(src, _dest_len), pad); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
/**
|
||
|
|
* strtomem - Copy NUL-terminated string to non-NUL-terminated buffer
|
||
|
|
*
|
||
|
|
* @dest: Pointer of destination character array (marked as __nonstring)
|
||
|
|
* @src: Pointer to NUL-terminated string
|
||
|
|
*
|
||
|
|
* This is a replacement for strncpy() uses where the destination is not
|
||
|
|
* a NUL-terminated string, but with bounds checking on the source size, and
|
||
|
|
* without trailing padding. If padding is required, use strtomem_pad().
|
||
|
|
*
|
||
|
|
* Note that the size of @dest is not an argument, as the length of @dest
|
||
|
|
* must be discoverable by the compiler.
|
||
|
|
*/
|
||
|
|
#define strtomem(dest, src) do { \
|
||
|
|
const size_t _dest_len = __builtin_object_size(dest, 1); \
|
||
|
|
\
|
||
|
|
BUILD_BUG_ON(!__builtin_constant_p(_dest_len) || \
|
||
|
|
_dest_len == (size_t)-1); \
|
||
|
|
memcpy(dest, src, min(_dest_len, strnlen(src, _dest_len))); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
/**
|
||
|
|
* memset_after - Set a value after a struct member to the end of a struct
|
||
|
|
*
|
||
|
|
* @obj: Address of target struct instance
|
||
|
|
* @v: Byte value to repeatedly write
|
||
|
|
* @member: after which struct member to start writing bytes
|
||
|
|
*
|
||
|
|
* This is good for clearing padding following the given member.
|
||
|
|
*/
|
||
|
|
#define memset_after(obj, v, member) \
|
||
|
|
({ \
|
||
|
|
u8 *__ptr = (u8 *)(obj); \
|
||
|
|
typeof(v) __val = (v); \
|
||
|
|
memset(__ptr + offsetofend(typeof(*(obj)), member), __val, \
|
||
|
|
sizeof(*(obj)) - offsetofend(typeof(*(obj)), member)); \
|
||
|
|
})
|
||
|
|
|
||
|
|
/**
|
||
|
|
* memset_startat - Set a value starting at a member to the end of a struct
|
||
|
|
*
|
||
|
|
* @obj: Address of target struct instance
|
||
|
|
* @v: Byte value to repeatedly write
|
||
|
|
* @member: struct member to start writing at
|
||
|
|
*
|
||
|
|
* Note that if there is padding between the prior member and the target
|
||
|
|
* member, memset_after() should be used to clear the prior padding.
|
||
|
|
*/
|
||
|
|
#define memset_startat(obj, v, member) \
|
||
|
|
({ \
|
||
|
|
u8 *__ptr = (u8 *)(obj); \
|
||
|
|
typeof(v) __val = (v); \
|
||
|
|
memset(__ptr + offsetof(typeof(*(obj)), member), __val, \
|
||
|
|
sizeof(*(obj)) - offsetof(typeof(*(obj)), member)); \
|
||
|
|
})
|
||
|
|
|
||
|
|
/**
|
||
|
|
* str_has_prefix - Test if a string has a given prefix
|
||
|
|
* @str: The string to test
|
||
|
|
* @prefix: The string to see if @str starts with
|
||
|
|
*
|
||
|
|
* A common way to test a prefix of a string is to do:
|
||
|
|
* strncmp(str, prefix, sizeof(prefix) - 1)
|
||
|
|
*
|
||
|
|
* But this can lead to bugs due to typos, or if prefix is a pointer
|
||
|
|
* and not a constant. Instead use str_has_prefix().
|
||
|
|
*
|
||
|
|
* Returns:
|
||
|
|
* * strlen(@prefix) if @str starts with @prefix
|
||
|
|
* * 0 if @str does not start with @prefix
|
||
|
|
*/
|
||
|
|
static __always_inline size_t str_has_prefix(const char *str, const char *prefix)
|
||
|
|
{
|
||
|
|
size_t len = strlen(prefix);
|
||
|
|
return strncmp(str, prefix, len) == 0 ? len : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* _LINUX_STRING_H_ */
|