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