[mirror_ubuntu-bionic-kernel.git] / include / linux / string.h

/* 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 <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 *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
#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
#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);
}

#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_MCSAFE
static inline __must_check int memcpy_mcsafe(void *dst, const void *src,
		size_t cnt)
{
	memcpy(dst, src, cnt);
	return 0;
}
#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);
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);
extern int kstrtobool(const char *s, bool *res);
static inline int strtobool(const char *s, bool *res)
{
	return kstrtobool(s, res);
}

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);

/**
 * 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);
void memzero_explicit(void *s, size_t count);

/**
 * 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;
}

#define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline))
#define __RENAME(x) __asm__(#x)

void fortify_panic(const char *name) __noreturn __cold;
void __read_overflow(void) __compiletime_error("detected read beyond size of object passed as 1st parameter");
void __read_overflow2(void) __compiletime_error("detected read beyond size of object passed as 2nd parameter");
void __read_overflow3(void) __compiletime_error("detected read beyond size of object passed as 3rd parameter");
void __write_overflow(void) __compiletime_error("detected write beyond size of object passed as 1st parameter");

#if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE)
__FORTIFY_INLINE char *strncpy(char *p, const char *q, __kernel_size_t size)
{
	size_t p_size = __builtin_object_size(p, 0);
	if (__builtin_constant_p(size) && p_size < size)
		__write_overflow();
	if (p_size < size)
		fortify_panic(__func__);
	return __builtin_strncpy(p, q, size);
}

__FORTIFY_INLINE char *strcat(char *p, const char *q)
{
	size_t p_size = __builtin_object_size(p, 0);
	if (p_size == (size_t)-1)
		return __builtin_strcat(p, q);
	if (strlcat(p, q, p_size) >= p_size)
		fortify_panic(__func__);
	return p;
}

__FORTIFY_INLINE __kernel_size_t strlen(const char *p)
{
	__kernel_size_t ret;
	size_t p_size = __builtin_object_size(p, 0);

	/* Work around gcc excess stack consumption issue */
	if (p_size == (size_t)-1 ||
	    (__builtin_constant_p(p[p_size - 1]) && p[p_size - 1] == '\0'))
		return __builtin_strlen(p);
	ret = strnlen(p, p_size);
	if (p_size <= ret)
		fortify_panic(__func__);
	return ret;
}

extern __kernel_size_t __real_strnlen(const char *, __kernel_size_t) __RENAME(strnlen);
__FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen)
{
	size_t p_size = __builtin_object_size(p, 0);
	__kernel_size_t ret = __real_strnlen(p, maxlen < p_size ? maxlen : p_size);
	if (p_size <= ret && maxlen != ret)
		fortify_panic(__func__);
	return ret;
}

/* defined after fortified strlen to reuse it */
extern size_t __real_strlcpy(char *, const char *, size_t) __RENAME(strlcpy);
__FORTIFY_INLINE size_t strlcpy(char *p, const char *q, size_t size)
{
	size_t ret;
	size_t p_size = __builtin_object_size(p, 0);
	size_t q_size = __builtin_object_size(q, 0);
	if (p_size == (size_t)-1 && q_size == (size_t)-1)
		return __real_strlcpy(p, q, size);
	ret = strlen(q);
	if (size) {
		size_t len = (ret >= size) ? size - 1 : ret;
		if (__builtin_constant_p(len) && len >= p_size)
			__write_overflow();
		if (len >= p_size)
			fortify_panic(__func__);
		__builtin_memcpy(p, q, len);
		p[len] = '\0';
	}
	return ret;
}

/* defined after fortified strlen and strnlen to reuse them */
__FORTIFY_INLINE char *strncat(char *p, const char *q, __kernel_size_t count)
{
	size_t p_len, copy_len;
	size_t p_size = __builtin_object_size(p, 0);
	size_t q_size = __builtin_object_size(q, 0);
	if (p_size == (size_t)-1 && q_size == (size_t)-1)
		return __builtin_strncat(p, q, count);
	p_len = strlen(p);
	copy_len = strnlen(q, count);
	if (p_size < p_len + copy_len + 1)
		fortify_panic(__func__);
	__builtin_memcpy(p + p_len, q, copy_len);
	p[p_len + copy_len] = '\0';
	return p;
}

__FORTIFY_INLINE void *memset(void *p, int c, __kernel_size_t size)
{
	size_t p_size = __builtin_object_size(p, 0);
	if (__builtin_constant_p(size) && p_size < size)
		__write_overflow();
	if (p_size < size)
		fortify_panic(__func__);
	return __builtin_memset(p, c, size);
}

__FORTIFY_INLINE void *memcpy(void *p, const void *q, __kernel_size_t size)
{
	size_t p_size = __builtin_object_size(p, 0);
	size_t q_size = __builtin_object_size(q, 0);
	if (__builtin_constant_p(size)) {
		if (p_size < size)
			__write_overflow();
		if (q_size < size)
			__read_overflow2();
	}
	if (p_size < size || q_size < size)
		fortify_panic(__func__);
	return __builtin_memcpy(p, q, size);
}

__FORTIFY_INLINE void *memmove(void *p, const void *q, __kernel_size_t size)
{
	size_t p_size = __builtin_object_size(p, 0);
	size_t q_size = __builtin_object_size(q, 0);
	if (__builtin_constant_p(size)) {
		if (p_size < size)
			__write_overflow();
		if (q_size < size)
			__read_overflow2();
	}
	if (p_size < size || q_size < size)
		fortify_panic(__func__);
	return __builtin_memmove(p, q, size);
}

extern void *__real_memscan(void *, int, __kernel_size_t) __RENAME(memscan);
__FORTIFY_INLINE void *memscan(void *p, int c, __kernel_size_t size)
{
	size_t p_size = __builtin_object_size(p, 0);
	if (__builtin_constant_p(size) && p_size < size)
		__read_overflow();
	if (p_size < size)
		fortify_panic(__func__);
	return __real_memscan(p, c, size);
}

__FORTIFY_INLINE int memcmp(const void *p, const void *q, __kernel_size_t size)
{
	size_t p_size = __builtin_object_size(p, 0);
	size_t q_size = __builtin_object_size(q, 0);
	if (__builtin_constant_p(size)) {
		if (p_size < size)
			__read_overflow();
		if (q_size < size)
			__read_overflow2();
	}
	if (p_size < size || q_size < size)
		fortify_panic(__func__);
	return __builtin_memcmp(p, q, size);
}

__FORTIFY_INLINE void *memchr(const void *p, int c, __kernel_size_t size)
{
	size_t p_size = __builtin_object_size(p, 0);
	if (__builtin_constant_p(size) && p_size < size)
		__read_overflow();
	if (p_size < size)
		fortify_panic(__func__);
	return __builtin_memchr(p, c, size);
}

void *__real_memchr_inv(const void *s, int c, size_t n) __RENAME(memchr_inv);
__FORTIFY_INLINE void *memchr_inv(const void *p, int c, size_t size)
{
	size_t p_size = __builtin_object_size(p, 0);
	if (__builtin_constant_p(size) && p_size < size)
		__read_overflow();
	if (p_size < size)
		fortify_panic(__func__);
	return __real_memchr_inv(p, c, size);
}

extern void *__real_kmemdup(const void *src, size_t len, gfp_t gfp) __RENAME(kmemdup);
__FORTIFY_INLINE void *kmemdup(const void *p, size_t size, gfp_t gfp)
{
	size_t p_size = __builtin_object_size(p, 0);
	if (__builtin_constant_p(size) && p_size < size)
		__read_overflow();
	if (p_size < size)
		fortify_panic(__func__);
	return __real_kmemdup(p, size, gfp);
}

/* defined after fortified strlen and memcpy to reuse them */
__FORTIFY_INLINE char *strcpy(char *p, const char *q)
{
	size_t p_size = __builtin_object_size(p, 0);
	size_t q_size = __builtin_object_size(q, 0);
	if (p_size == (size_t)-1 && q_size == (size_t)-1)
		return __builtin_strcpy(p, q);
	memcpy(p, q, strlen(q) + 1);
	return p;
}

#endif

/**
 * memcpy_and_pad - Copy one buffer to another with padding
 * @dest: Where to copy to
 * @dest_len: The destination buffer size
 * @src: Where to copy from
 * @count: The number of bytes to copy
 * @pad: Character to use for padding if space is left in destination.
 */
static inline void memcpy_and_pad(void *dest, size_t dest_len,
				  const void *src, size_t count, int pad)
{
	if (dest_len > count) {
		memcpy(dest, src, count);
		memset(dest + count, pad,  dest_len - count);
	} else
		memcpy(dest, src, dest_len);
}

#endif /* _LINUX_STRING_H_ */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _LINUX_STRING_H_
	3	#define _LINUX_STRING_H_
	4
1da177e4 LT	5
	6	#include <linux/compiler.h> /* for inline */
	7	#include <linux/types.h> /* for size_t */
	8	#include <linux/stddef.h> /* for NULL */
4370aa4a	9	#include <stdarg.h>
607ca46e	10	#include <uapi/linux/string.h>
1da177e4	11
96840aa0	12	extern char strndup_user(const char __user , long);
610a77e0	13	extern void memdup_user(const void __user , size_t);
e9d408e1	14	extern void memdup_user_nul(const void __user , size_t);
96840aa0	15
1da177e4 LT	16	/*
	17	* Include machine specific inline routines
	18	*/
	19	#include <asm/string.h>
	20
	21	#ifndef __HAVE_ARCH_STRCPY
	22	extern char * strcpy(char ,const char );
	23	#endif
	24	#ifndef __HAVE_ARCH_STRNCPY
	25	extern char * strncpy(char ,const char , __kernel_size_t);
	26	#endif
	27	#ifndef __HAVE_ARCH_STRLCPY
	28	size_t strlcpy(char , const char , size_t);
	29	#endif
30035e45	30	#ifndef __HAVE_ARCH_STRSCPY
bde8e55a	31	ssize_t strscpy(char , const char , size_t);
30035e45	32	#endif
1da177e4 LT	33	#ifndef __HAVE_ARCH_STRCAT
	34	extern char * strcat(char , const char );
	35	#endif
	36	#ifndef __HAVE_ARCH_STRNCAT
	37	extern char * strncat(char , const char , __kernel_size_t);
	38	#endif
	39	#ifndef __HAVE_ARCH_STRLCAT
	40	extern size_t strlcat(char , const char , __kernel_size_t);
	41	#endif
	42	#ifndef __HAVE_ARCH_STRCMP
	43	extern int strcmp(const char ,const char );
	44	#endif
	45	#ifndef __HAVE_ARCH_STRNCMP
	46	extern int strncmp(const char ,const char ,__kernel_size_t);
	47	#endif
ded220bd DM	48	#ifndef __HAVE_ARCH_STRCASECMP
	49	extern int strcasecmp(const char s1, const char s2);
	50	#endif
	51	#ifndef __HAVE_ARCH_STRNCASECMP
	52	extern int strncasecmp(const char s1, const char s2, size_t n);
	53	#endif
1da177e4 LT	54	#ifndef __HAVE_ARCH_STRCHR
	55	extern char * strchr(const char *,int);
	56	#endif
11d200e9 GL	57	#ifndef __HAVE_ARCH_STRCHRNUL
	58	extern char * strchrnul(const char *,int);
	59	#endif
1da177e4 LT	60	#ifndef __HAVE_ARCH_STRNCHR
	61	extern char * strnchr(const char *, size_t, int);
	62	#endif
	63	#ifndef __HAVE_ARCH_STRRCHR
	64	extern char * strrchr(const char *,int);
	65	#endif
f653398c	66	extern char * __must_check skip_spaces(const char *);
ca54cb8c KM	67
	68	extern char strim(char );
	69
	70	static inline __must_check char strstrip(char str)
	71	{
	72	return strim(str);
	73	}
	74
1da177e4	75	#ifndef __HAVE_ARCH_STRSTR
d5f1fb53 LZ	76	extern char * strstr(const char , const char );
	77	#endif
	78	#ifndef __HAVE_ARCH_STRNSTR
	79	extern char * strnstr(const char , const char , size_t);
1da177e4 LT	80	#endif
	81	#ifndef __HAVE_ARCH_STRLEN
	82	extern __kernel_size_t strlen(const char *);
	83	#endif
	84	#ifndef __HAVE_ARCH_STRNLEN
	85	extern __kernel_size_t strnlen(const char *,__kernel_size_t);
	86	#endif
8833d328 KM	87	#ifndef __HAVE_ARCH_STRPBRK
	88	extern char * strpbrk(const char ,const char );
	89	#endif
	90	#ifndef __HAVE_ARCH_STRSEP
	91	extern char * strsep(char *,const char );
	92	#endif
	93	#ifndef __HAVE_ARCH_STRSPN
	94	extern __kernel_size_t strspn(const char ,const char );
	95	#endif
	96	#ifndef __HAVE_ARCH_STRCSPN
	97	extern __kernel_size_t strcspn(const char ,const char );
	98	#endif
1da177e4 LT	99
	100	#ifndef __HAVE_ARCH_MEMSET
	101	extern void * memset(void *,int,__kernel_size_t);
	102	#endif
3b3c4bab MW	103
	104	#ifndef __HAVE_ARCH_MEMSET16
	105	extern void memset16(uint16_t , uint16_t, __kernel_size_t);
	106	#endif
	107
	108	#ifndef __HAVE_ARCH_MEMSET32
	109	extern void memset32(uint32_t , uint32_t, __kernel_size_t);
	110	#endif
	111
	112	#ifndef __HAVE_ARCH_MEMSET64
	113	extern void memset64(uint64_t , uint64_t, __kernel_size_t);
	114	#endif
	115
	116	static inline void memset_l(unsigned long p, unsigned long v,
	117	__kernel_size_t n)
	118	{
	119	if (BITS_PER_LONG == 32)
	120	return memset32((uint32_t *)p, v, n);
	121	else
	122	return memset64((uint64_t *)p, v, n);
	123	}
	124
	125	static inline void memset_p(void p, void v, __kernel_size_t n)
	126	{
	127	if (BITS_PER_LONG == 32)
	128	return memset32((uint32_t *)p, (uintptr_t)v, n);
	129	else
	130	return memset64((uint64_t *)p, (uintptr_t)v, n);
	131	}
	132
1da177e4 LT	133	#ifndef __HAVE_ARCH_MEMCPY
	134	extern void * memcpy(void ,const void ,__kernel_size_t);
	135	#endif
	136	#ifndef __HAVE_ARCH_MEMMOVE
	137	extern void * memmove(void ,const void ,__kernel_size_t);
	138	#endif
	139	#ifndef __HAVE_ARCH_MEMSCAN
	140	extern void * memscan(void *,int,__kernel_size_t);
	141	#endif
	142	#ifndef __HAVE_ARCH_MEMCMP
	143	extern int memcmp(const void ,const void ,__kernel_size_t);
	144	#endif
cafefe49 ND	145	#ifndef __HAVE_ARCH_BCMP
	146	extern int bcmp(const void ,const void ,__kernel_size_t);
	147	#endif
1da177e4 LT	148	#ifndef __HAVE_ARCH_MEMCHR
	149	extern void * memchr(const void *,int,__kernel_size_t);
	150	#endif
6abccd1b DW	151	#ifndef __HAVE_ARCH_MEMCPY_MCSAFE
	152	static inline __must_check int memcpy_mcsafe(void dst, const void src,
	153	size_t cnt)
	154	{
	155	memcpy(dst, src, cnt);
	156	return 0;
	157	}
	158	#endif
0aed55af DW	159	#ifndef __HAVE_ARCH_MEMCPY_FLUSHCACHE
	160	static inline void memcpy_flushcache(void dst, const void src, size_t cnt)
	161	{
	162	memcpy(dst, src, cnt);
	163	}
	164	#endif
79824820	165	void memchr_inv(const void s, int c, size_t n);
94df2904	166	char strreplace(char s, char old, char new);
1da177e4	167
a4bb1e43 AH	168	extern void kfree_const(const void *x);
a4bb1e43 AH	169
48a27055	170	extern char kstrdup(const char s, gfp_t gfp) __malloc;
a4bb1e43	171	extern const char kstrdup_const(const char s, gfp_t gfp);
1e66df3e	172	extern char kstrndup(const char s, size_t len, gfp_t gfp);
1a2f67b4	173	extern void kmemdup(const void src, size_t len, gfp_t gfp);
f3515741	174	extern char kmemdup_nul(const char s, size_t len, gfp_t gfp);
543537bd	175
d84d1cc7 JF	176	extern char *argv_split(gfp_t gfp, const char str, int *argcp);
	177	extern void argv_free(char **argv);
	178
34990cf7	179	extern bool sysfs_streq(const char s1, const char s2);
ef951599 KC	180	extern int kstrtobool(const char s, bool res);
	181	static inline int strtobool(const char s, bool res)
	182	{
	183	return kstrtobool(s, res);
	184	}
34990cf7	185
56b06081	186	int match_string(const char * const array, size_t n, const char string);
e1fe7b6a HK	187	int __sysfs_match_string(const char * const array, size_t n, const char s);
	188
	189	/**
	190	* sysfs_match_string - matches given string in an array
	191	* @_a: array of strings
	192	* @_s: string to match with
	193	*
	194	* Helper for __sysfs_match_string(). Calculates the size of @a automatically.
	195	*/
	196	#define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s)
56b06081	197
4370aa4a LJ	198	#ifdef CONFIG_BINARY_PRINTF
	199	int vbin_printf(u32 bin_buf, size_t size, const char fmt, va_list args);
	200	int bstr_printf(char buf, size_t size, const char fmt, const u32 *bin_buf);
	201	int bprintf(u32 bin_buf, size_t size, const char fmt, ...) __printf(3, 4);
	202	#endif
	203
e108526e	204	extern ssize_t memory_read_from_buffer(void to, size_t count, loff_t ppos,
d4c5efdb	205	const void *from, size_t available);
e108526e	206
66f92cf9 RR	207	/**
	208	* strstarts - does @str start with @prefix?
	209	* @str: string to examine
	210	* @prefix: prefix to look for.
	211	*/
	212	static inline bool strstarts(const char str, const char prefix)
	213	{
	214	return strncmp(str, prefix, strlen(prefix)) == 0;
	215	}
639b9e34	216
d4c5efdb DB	217	size_t memweight(const void *ptr, size_t bytes);
d4c5efdb DB	218	void memzero_explicit(void *s, size_t count);
639b9e34	219
b18888ab AS	220	/**
	221	* kbasename - return the last part of a pathname.
	222	*
	223	* @path: path to extract the filename from.
	224	*/
	225	static inline const char kbasename(const char path)
	226	{
	227	const char *tail = strrchr(path, '/');
	228	return tail ? tail + 1 : path;
	229	}
	230
6974f0c4 DM	231	#define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline))
	232	#define __RENAME(x) __asm__(#x)
	233
	234	void fortify_panic(const char *name) __noreturn __cold;
	235	void __read_overflow(void) __compiletime_error("detected read beyond size of object passed as 1st parameter");
	236	void __read_overflow2(void) __compiletime_error("detected read beyond size of object passed as 2nd parameter");
01f33c33	237	void __read_overflow3(void) __compiletime_error("detected read beyond size of object passed as 3rd parameter");
6974f0c4 DM	238	void __write_overflow(void) __compiletime_error("detected write beyond size of object passed as 1st parameter");
	239
	240	#if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE)
6974f0c4 DM	241	__FORTIFY_INLINE char strncpy(char p, const char *q, __kernel_size_t size)
	242	{
	243	size_t p_size = __builtin_object_size(p, 0);
	244	if (__builtin_constant_p(size) && p_size < size)
	245	__write_overflow();
	246	if (p_size < size)
	247	fortify_panic(__func__);
	248	return __builtin_strncpy(p, q, size);
	249	}
	250
	251	__FORTIFY_INLINE char strcat(char p, const char *q)
	252	{
	253	size_t p_size = __builtin_object_size(p, 0);
	254	if (p_size == (size_t)-1)
	255	return __builtin_strcat(p, q);
	256	if (strlcat(p, q, p_size) >= p_size)
	257	fortify_panic(__func__);
	258	return p;
	259	}
	260
	261	__FORTIFY_INLINE __kernel_size_t strlen(const char *p)
	262	{
	263	__kernel_size_t ret;
	264	size_t p_size = __builtin_object_size(p, 0);
146734b0 AB	265
	266	/* Work around gcc excess stack consumption issue */
	267	if (p_size == (size_t)-1 \|\|
	268	(__builtin_constant_p(p[p_size - 1]) && p[p_size - 1] == '\0'))
6974f0c4 DM	269	return __builtin_strlen(p);
	270	ret = strnlen(p, p_size);
	271	if (p_size <= ret)
	272	fortify_panic(__func__);
	273	return ret;
	274	}
	275
	276	extern __kernel_size_t __real_strnlen(const char *, __kernel_size_t) __RENAME(strnlen);
	277	__FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen)
	278	{
	279	size_t p_size = __builtin_object_size(p, 0);
	280	__kernel_size_t ret = __real_strnlen(p, maxlen < p_size ? maxlen : p_size);
	281	if (p_size <= ret && maxlen != ret)
	282	fortify_panic(__func__);
	283	return ret;
	284	}
	285
	286	/* defined after fortified strlen to reuse it */
	287	extern size_t __real_strlcpy(char , const char , size_t) __RENAME(strlcpy);
	288	__FORTIFY_INLINE size_t strlcpy(char p, const char q, size_t size)
	289	{
	290	size_t ret;
	291	size_t p_size = __builtin_object_size(p, 0);
	292	size_t q_size = __builtin_object_size(q, 0);
	293	if (p_size == (size_t)-1 && q_size == (size_t)-1)
	294	return __real_strlcpy(p, q, size);
	295	ret = strlen(q);
	296	if (size) {
	297	size_t len = (ret >= size) ? size - 1 : ret;
	298	if (__builtin_constant_p(len) && len >= p_size)
	299	__write_overflow();
	300	if (len >= p_size)
	301	fortify_panic(__func__);
	302	__builtin_memcpy(p, q, len);
	303	p[len] = '\0';
	304	}
	305	return ret;
	306	}
	307
	308	/* defined after fortified strlen and strnlen to reuse them */
	309	__FORTIFY_INLINE char strncat(char p, const char *q, __kernel_size_t count)
	310	{
	311	size_t p_len, copy_len;
	312	size_t p_size = __builtin_object_size(p, 0);
	313	size_t q_size = __builtin_object_size(q, 0);
	314	if (p_size == (size_t)-1 && q_size == (size_t)-1)
	315	return __builtin_strncat(p, q, count);
	316	p_len = strlen(p);
	317	copy_len = strnlen(q, count);
	318	if (p_size < p_len + copy_len + 1)
	319	fortify_panic(__func__);
	320	__builtin_memcpy(p + p_len, q, copy_len);
	321	p[p_len + copy_len] = '\0';
	322	return p;
	323	}
	324
	325	__FORTIFY_INLINE void memset(void p, int c, __kernel_size_t size)
	326	{
	327	size_t p_size = __builtin_object_size(p, 0);
	328	if (__builtin_constant_p(size) && p_size < size)
	329	__write_overflow();
	330	if (p_size < size)
	331	fortify_panic(__func__);
	332	return __builtin_memset(p, c, size);
333	}
334
335	__FORTIFY_INLINE void memcpy(void p, const void *q, __kernel_size_t size)
336	{
337	size_t p_size = __builtin_object_size(p, 0);
338	size_t q_size = __builtin_object_size(q, 0);
339	if (__builtin_constant_p(size)) {
340	if (p_size < size)
341	__write_overflow();
342	if (q_size < size)
343	__read_overflow2();
344	}
345	if (p_size < size \|\| q_size < size)
346	fortify_panic(__func__);
347	return __builtin_memcpy(p, q, size);
348	}
349
350	__FORTIFY_INLINE void memmove(void p, const void *q, __kernel_size_t size)
351	{
352	size_t p_size = __builtin_object_size(p, 0);
353	size_t q_size = __builtin_object_size(q, 0);
354	if (__builtin_constant_p(size)) {
355	if (p_size < size)
356	__write_overflow();
357	if (q_size < size)
358	__read_overflow2();
359	}
360	if (p_size < size \|\| q_size < size)
361	fortify_panic(__func__);
362	return __builtin_memmove(p, q, size);
363	}
364
365	extern void __real_memscan(void , int, __kernel_size_t) __RENAME(memscan);
366	__FORTIFY_INLINE void memscan(void p, int c, __kernel_size_t size)
367	{
368	size_t p_size = __builtin_object_size(p, 0);
369	if (__builtin_constant_p(size) && p_size < size)
370	__read_overflow();
371	if (p_size < size)
372	fortify_panic(__func__);
373	return __real_memscan(p, c, size);
374	}
375
376	__FORTIFY_INLINE int memcmp(const void p, const void q, __kernel_size_t size)
377	{
378	size_t p_size = __builtin_object_size(p, 0);
379	size_t q_size = __builtin_object_size(q, 0);
380	if (__builtin_constant_p(size)) {
381	if (p_size < size)
382	__read_overflow();
383	if (q_size < size)
384	__read_overflow2();
385	}
386	if (p_size < size \|\| q_size < size)
387	fortify_panic(__func__);
388	return __builtin_memcmp(p, q, size);
389	}
390
391	__FORTIFY_INLINE void memchr(const void p, int c, __kernel_size_t size)
392	{
393	size_t p_size = __builtin_object_size(p, 0);
394	if (__builtin_constant_p(size) && p_size < size)
395	__read_overflow();
396	if (p_size < size)
397	fortify_panic(__func__);
398	return __builtin_memchr(p, c, size);
399	}
400
401	void __real_memchr_inv(const void s, int c, size_t n) __RENAME(memchr_inv);
402	__FORTIFY_INLINE void memchr_inv(const void p, int c, size_t size)
403	{
404	size_t p_size = __builtin_object_size(p, 0);
405	if (__builtin_constant_p(size) && p_size < size)
406	__read_overflow();
407	if (p_size < size)
408	fortify_panic(__func__);
409	return __real_memchr_inv(p, c, size);
410	}
411
412	extern void __real_kmemdup(const void src, size_t len, gfp_t gfp) __RENAME(kmemdup);
413	__FORTIFY_INLINE void kmemdup(const void p, size_t size, gfp_t gfp)
414	{
415	size_t p_size = __builtin_object_size(p, 0);
416	if (__builtin_constant_p(size) && p_size < size)
417	__read_overflow();
418	if (p_size < size)
419	fortify_panic(__func__);
420	return __real_kmemdup(p, size, gfp);
421	}
077d2ba5 DM	422
	423	/* defined after fortified strlen and memcpy to reuse them */
	424	__FORTIFY_INLINE char strcpy(char p, const char *q)
	425	{
	426	size_t p_size = __builtin_object_size(p, 0);
	427	size_t q_size = __builtin_object_size(q, 0);
	428	if (p_size == (size_t)-1 && q_size == (size_t)-1)
	429	return __builtin_strcpy(p, q);
	430	memcpy(p, q, strlen(q) + 1);
	431	return p;
	432	}
	433
6974f0c4 DM	434	#endif
6974f0c4 DM	435
01f33c33 MW	436	/**
	437	* memcpy_and_pad - Copy one buffer to another with padding
	438	* @dest: Where to copy to
	439	* @dest_len: The destination buffer size
	440	* @src: Where to copy from
	441	* @count: The number of bytes to copy
	442	* @pad: Character to use for padding if space is left in destination.
	443	*/
1359798f MW	444	static inline void memcpy_and_pad(void *dest, size_t dest_len,
1359798f MW	445	const void *src, size_t count, int pad)
01f33c33	446	{
01f33c33 MW	447	if (dest_len > count) {
	448	memcpy(dest, src, count);
	449	memset(dest + count, pad, dest_len - count);
	450	} else
	451	memcpy(dest, src, dest_len);
	452	}
	453
1da177e4	454	#endif /* _LINUX_STRING_H_ */