| /* 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 __must_check 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_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); |
| if (p_size == (size_t)-1) |
| 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_ */ |