/** * memdup_array_user - duplicate array from user space * @src: source address in user space * @n: number of array members to copy * @size: size of one array member * * Return: an ERR_PTR() on failure. Result is physically * contiguous, to be freed by kfree().
*/ staticinline __realloc_size(2, 3) void *memdup_array_user(constvoid __user *src, size_t n, size_t size)
{
size_t nbytes;
if (check_mul_overflow(n, size, &nbytes)) return ERR_PTR(-EOVERFLOW);
return memdup_user(src, nbytes);
}
/** * vmemdup_array_user - duplicate array from user space * @src: source address in user space * @n: number of array members to copy * @size: size of one array member * * Return: an ERR_PTR() on failure. Result may be not * physically contiguous. Use kvfree() to free.
*/ staticinline __realloc_size(2, 3) void *vmemdup_array_user(constvoid __user *src, size_t n, size_t size)
{
size_t nbytes;
if (check_mul_overflow(n, size, &nbytes)) return ERR_PTR(-EOVERFLOW);
return vmemdup_user(src, nbytes);
}
/* * Include machine specific inline routines
*/ #include <asm/string.h>
/* * The 2 argument style can only be used when dst is an array with a * known size.
*/ #define __strscpy0(dst, src, ...) \
sized_strscpy(dst, src, sizeof(dst) + __must_be_array(dst) + \
__must_be_cstr(dst) + __must_be_cstr(src)) #define __strscpy1(dst, src, size) \
sized_strscpy(dst, src, size + __must_be_cstr(dst) + __must_be_cstr(src))
/** * strscpy - Copy a C-string into a sized buffer * @dst: Where to copy the string to * @src: Where to copy the string from * @...: Size of destination buffer (optional) * * Copy the source string @src, or as much of it as fits, into the * destination @dst buffer. The behavior is undefined if the string * buffers overlap. The destination @dst buffer is always NUL terminated, * unless it's zero-sized. * * The size argument @... is only required when @dst is not an array, or * when the copy needs to be smaller than sizeof(@dst). * * Preferred to strncpy() since it always returns a valid string, and * doesn't unnecessarily force the tail of the destination buffer to be * zero padded. If padding is desired please use strscpy_pad(). * * Returns the number of characters copied in @dst (not including the * trailing %NUL) or -E2BIG if @size is 0 or the copy from @src was * truncated.
*/ #define strscpy(dst, src, ...) \
CONCATENATE(__strscpy, COUNT_ARGS(__VA_ARGS__))(dst, src, __VA_ARGS__)
/** * strscpy_pad() - Copy a C-string into a sized buffer * @dst: Where to copy the string to * @src: Where to copy the string from * @...: Size of destination buffer * * Copy the string, or as much of it as fits, into the dest buffer. The * behavior is undefined if the string buffers overlap. The destination * buffer is always %NUL terminated, unless it's zero-sized. * * If the source string is shorter than the destination buffer, the * remaining bytes in the buffer will be filled with %NUL bytes. * * For full explanation of why you may want to consider using the * 'strscpy' functions please see the function docstring for strscpy(). * * Returns: * * The number of characters copied (not including the trailing %NULs) * * -E2BIG if count is 0 or @src was truncated.
*/ #define strscpy_pad(dst, src, ...) \
CONCATENATE(__strscpy_pad, COUNT_ARGS(__VA_ARGS__))(dst, src, __VA_ARGS__)
/** * mem_is_zero - Check if an area of memory is all 0's. * @s: The memory area * @n: The size of the area * * Return: True if the area of memory is all 0's.
*/ staticinlinebool mem_is_zero(constvoid *s, size_t n)
{ return !memchr_inv(s, 0, n);
}
externbool sysfs_streq(constchar *s1, constchar *s2); int match_string(constchar * const *array, size_t n, constchar *string); int __sysfs_match_string(constchar * const *array, size_t n, constchar *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)
int ptr_to_hashval(constvoid *ptr, unsignedlong *hashval_out);
size_t memweight(constvoid *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.
*/ staticinlinevoid 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.
*/ staticinlineconstchar *kbasename(constchar *path)
{ constchar *tail = strrchr(path, '/'); return tail ? tail + 1 : path;
}
/** * 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 = __must_be_byte_array(dest) + \
__must_be_noncstr(dest) + \
ARRAY_SIZE(dest); \ const size_t _src_len = __must_be_cstr(src) + \
__builtin_object_size(src, 1); \
\
BUILD_BUG_ON(!__builtin_constant_p(_dest_len) || \
_dest_len == (size_t)-1); \
memcpy_and_pad(dest, _dest_len, src, \
strnlen(src, min(_src_len, _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 = __must_be_byte_array(dest) + \
__must_be_noncstr(dest) + \
ARRAY_SIZE(dest); \ const size_t _src_len = __must_be_cstr(src) + \
__builtin_object_size(src, 1); \
\
BUILD_BUG_ON(!__builtin_constant_p(_dest_len) || \
_dest_len == (size_t)-1); \
memcpy(dest, src, strnlen(src, min(_src_len, _dest_len))); \
} while (0)
/** * memtostr - Copy a possibly non-NUL-term string to a NUL-term string * @dest: Pointer to destination NUL-terminates string * @src: Pointer to character array (likely marked as __nonstring) * * This is a replacement for strncpy() uses where the source is not * a NUL-terminated string. * * Note that sizes of @dest and @src must be known at compile-time.
*/ #define memtostr(dest, src) do { \ const size_t _dest_len = __must_be_byte_array(dest) + \
__must_be_cstr(dest) + \
ARRAY_SIZE(dest); \ const size_t _src_len = __must_be_noncstr(src) + \
__builtin_object_size(src, 1); \ const size_t _src_chars = strnlen(src, _src_len); \ const size_t _copy_len = min(_dest_len - 1, _src_chars); \
\
BUILD_BUG_ON(!__builtin_constant_p(_dest_len) || \
!__builtin_constant_p(_src_len) || \
_dest_len == 0 || _dest_len == (size_t)-1 || \
_src_len == 0 || _src_len == (size_t)-1); \
memcpy(dest, src, _copy_len); \
dest[_copy_len] = '\0'; \
} while (0)
/** * memtostr_pad - Copy a possibly non-NUL-term string to a NUL-term string * with NUL padding in the destination * @dest: Pointer to destination NUL-terminates string * @src: Pointer to character array (likely marked as __nonstring) * * This is a replacement for strncpy() uses where the source is not * a NUL-terminated string. * * Note that sizes of @dest and @src must be known at compile-time.
*/ #define memtostr_pad(dest, src) do { \ const size_t _dest_len = __must_be_byte_array(dest) + \
__must_be_cstr(dest) + \
ARRAY_SIZE(dest); \ const size_t _src_len = __must_be_noncstr(src) + \
__builtin_object_size(src, 1); \ const size_t _src_chars = strnlen(src, _src_len); \ const size_t _copy_len = min(_dest_len - 1, _src_chars); \
\
BUILD_BUG_ON(!__builtin_constant_p(_dest_len) || \
!__builtin_constant_p(_src_len) || \
_dest_len == 0 || _dest_len == (size_t)-1 || \
_src_len == 0 || _src_len == (size_t)-1); \
memcpy(dest, src, _copy_len); \
memset(&dest[_copy_len], 0, _dest_len - _copy_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(constchar *str, constchar *prefix)
{
size_t len = strlen(prefix); return strncmp(str, prefix, len) == 0 ? len : 0;
}
/** * strstarts - does @str start with @prefix? * @str: string to examine * @prefix: prefix to look for.
*/ staticinlinebool strstarts(constchar *str, constchar *prefix)
{ return strncmp(str, prefix, strlen(prefix)) == 0;
}
#endif/* _LINUX_STRING_H_ */
¤ Dauer der Verarbeitung: 0.15 Sekunden
(vorverarbeitet)
¤
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung ist noch experimentell.
