Something went wrong. Try again.
(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_STRING_H_#define _LINUX_STRING_H_
#include <linux/args.h>#include <linux/array_size.h>#include <linux/cleanup.h> /* for DEFINE_FREE() */#include <linux/compiler.h> /* for inline */#include <linux/types.h> /* for size_t */#include <linux/stddef.h> /* for NULL */#include <linux/err.h> /* for ERR_PTR() */#include <linux/errno.h> /* for E2BIG */#include <linux/overflow.h> /* for check_mul_overflow() */#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) __realloc_size(2);extern void *vmemdup_user(const void __user *, size_t) __realloc_size(2);extern void *memdup_user_nul(const void __user *, size_t);
/** * 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(). */static inline __realloc_size(2, 3)void *memdup_array_user(const void __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. */static inline __realloc_size(2, 3)void *vmemdup_array_user(const void __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>
#ifndef __HAVE_ARCH_STRCPYextern char * strcpy(char *,const char *);#endifssize_t sized_strscpy(char *, const char *, size_t);
/* * 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))
#define __strscpy_pad0(dst, src, ...) \ sized_strscpy_pad(dst, src, sizeof(dst) + __must_be_array(dst) + \ __must_be_cstr(dst) + __must_be_cstr(src))#define __strscpy_pad1(dst, src, size) \ sized_strscpy_pad(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__)
#define sized_strscpy_pad(dest, src, count) ({ \ char *__dst = (dest); \ const char *__src = (src); \ const size_t __count = (count); \ ssize_t __wrote; \ \ __wrote = sized_strscpy(__dst, __src, __count); \ if (__wrote >= 0 && __wrote < __count) \ memset(__dst + __wrote + 1, 0, __count - __wrote - 1); \ __wrote; \})
/** * 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__)
#ifndef __HAVE_ARCH_STRCATextern char * strcat(char *, const char *);#endif#ifndef __HAVE_ARCH_STRNCATextern char * strncat(char *, const char *, __kernel_size_t);#endif#ifndef __HAVE_ARCH_STRLCATextern size_t strlcat(char *, const char *, __kernel_size_t);#endif#ifndef __HAVE_ARCH_STRCMPextern int strcmp(const char *,const char *);#endif#ifndef __HAVE_ARCH_STRNCMPextern int strncmp(const char *,const char *,__kernel_size_t);#endif#ifndef __HAVE_ARCH_STRCASECMPextern int strcasecmp(const char *s1, const char *s2);#endif#ifndef __HAVE_ARCH_STRNCASECMPextern int strncasecmp(const char *s1, const char *s2, size_t n);#endif#ifndef __HAVE_ARCH_STRCHRextern char * strchr(const char *,int);#endif#ifndef __HAVE_ARCH_STRCHRNULextern char * strchrnul(const char *,int);#endifextern char * strnchrnul(const char *, size_t, int);#ifndef __HAVE_ARCH_STRNCHRextern char * strnchr(const char *, size_t, int);#endif#ifndef __HAVE_ARCH_STRRCHRextern char * strrchr(const char *,int);#endifextern 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_STRSTRextern char * strstr(const char *, const char *);#endif#ifndef __HAVE_ARCH_STRNSTRextern char * strnstr(const char *, const char *, size_t);#endif#ifndef __HAVE_ARCH_STRLENextern __kernel_size_t strlen(const char *);#endif#ifndef __HAVE_ARCH_STRNLENextern __kernel_size_t strnlen(const char *,__kernel_size_t);#endif#ifndef __HAVE_ARCH_STRPBRKextern char * strpbrk(const char *,const char *);#endif#ifndef __HAVE_ARCH_STRSEPextern char * strsep(char **,const char *);#endif#ifndef __HAVE_ARCH_STRSPNextern __kernel_size_t strspn(const char *,const char *);#endif#ifndef __HAVE_ARCH_STRCSPNextern __kernel_size_t strcspn(const char *,const char *);#endif
#ifndef __HAVE_ARCH_MEMSETextern void * memset(void *,int,__kernel_size_t);#endif
#ifndef __HAVE_ARCH_MEMSET16extern void *memset16(uint16_t *, uint16_t, __kernel_size_t);#endif
#ifndef __HAVE_ARCH_MEMSET32extern void *memset32(uint32_t *, uint32_t, __kernel_size_t);#endif
#ifndef __HAVE_ARCH_MEMSET64extern 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_MEMCPYextern void * memcpy(void *,const void *,__kernel_size_t);#endif#ifndef __HAVE_ARCH_MEMMOVEextern void * memmove(void *,const void *,__kernel_size_t);#endif#ifndef __HAVE_ARCH_MEMSCANextern void * memscan(void *,int,__kernel_size_t);#endif#ifndef __HAVE_ARCH_MEMCMPextern int memcmp(const void *,const void *,__kernel_size_t);#endif#ifndef __HAVE_ARCH_BCMPextern int bcmp(const void *,const void *,__kernel_size_t);#endif#ifndef __HAVE_ARCH_MEMCHRextern void * memchr(const void *,int,__kernel_size_t);#endif#ifndef __HAVE_ARCH_MEMCPY_FLUSHCACHEstatic 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 *str, char old, char new);
/** * 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. */static inline bool mem_is_zero(const void *s, size_t n){ return !memchr_inv(s, 0, n);}
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_noprof(const void *src, size_t len, gfp_t gfp) __realloc_size(2);#define kmemdup(...) alloc_hooks(kmemdup_noprof(__VA_ARGS__))
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 void *kmemdup_array(const void *src, size_t count, size_t element_size, gfp_t gfp) __realloc_size(2, 3);
/* lib/argv_split.c */extern char **argv_split(gfp_t gfp, const char *str, int *argcp);extern void argv_free(char **argv);
DEFINE_FREE(argv_free, char **, if (!IS_ERR_OR_NULL(_T)) argv_free(_T))
/* lib/cmdline.c */extern int get_option(char **str, int *pint);extern char *get_options(const char *str, int nints, int *ints);extern unsigned long long memparse(const char *ptr, char **retptr);extern bool parse_option_str(const char *str, const char *option);extern char *next_arg(char *args, char **param, char **val);
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_PRINTFint 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);#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);
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. * * Returns: * Pointer to the filename portion inside @path. If no '/' exists, * returns @path unchanged. */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 = __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(const char *str, const char *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. * * Returns: * True if @str begins with @prefix. False in all other cases. */static inline bool strstarts(const char *str, const char *prefix){ return strncmp(str, prefix, strlen(prefix)) == 0;}
/** * strends - Check if a string ends with another string. * @str: NULL-terminated string to check against @suffix * @suffix: NULL-terminated string defining the suffix to look for in @str * * Returns: * True if @str ends with @suffix. False in all other cases. */static inline bool __attribute__((nonnull(1, 2)))strends(const char *str, const char *suffix){ unsigned int str_len = strlen(str), suffix_len = strlen(suffix);
if (str_len < suffix_len) return false;
return !(strcmp(str + str_len - suffix_len, suffix));}
#endif /* _LINUX_STRING_H_ */