1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_STRING_HELPERS_H_
3 #define _LINUX_STRING_HELPERS_H_
5 #include <linux/bits.h>
6 #include <linux/ctype.h>
7 #include <linux/string.h>
8 #include <linux/types.h>
14 /* Descriptions of the types of units to
16 enum string_size_units {
17 STRING_UNITS_10, /* use powers of 10^3 (standard SI) */
18 STRING_UNITS_2, /* use binary powers of 2^10 */
21 void string_get_size(u64 size, u64 blk_size, enum string_size_units units,
24 int parse_int_array_user(const char __user *from, size_t count, int **array);
26 #define UNESCAPE_SPACE BIT(0)
27 #define UNESCAPE_OCTAL BIT(1)
28 #define UNESCAPE_HEX BIT(2)
29 #define UNESCAPE_SPECIAL BIT(3)
30 #define UNESCAPE_ANY \
31 (UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_HEX | UNESCAPE_SPECIAL)
33 #define UNESCAPE_ALL_MASK GENMASK(3, 0)
35 int string_unescape(char *src, char *dst, size_t size, unsigned int flags);
37 static inline int string_unescape_inplace(char *buf, unsigned int flags)
39 return string_unescape(buf, buf, 0, flags);
42 static inline int string_unescape_any(char *src, char *dst, size_t size)
44 return string_unescape(src, dst, size, UNESCAPE_ANY);
47 static inline int string_unescape_any_inplace(char *buf)
49 return string_unescape_any(buf, buf, 0);
52 #define ESCAPE_SPACE BIT(0)
53 #define ESCAPE_SPECIAL BIT(1)
54 #define ESCAPE_NULL BIT(2)
55 #define ESCAPE_OCTAL BIT(3)
57 (ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_SPECIAL | ESCAPE_NULL)
58 #define ESCAPE_NP BIT(4)
59 #define ESCAPE_ANY_NP (ESCAPE_ANY | ESCAPE_NP)
60 #define ESCAPE_HEX BIT(5)
61 #define ESCAPE_NA BIT(6)
62 #define ESCAPE_NAP BIT(7)
63 #define ESCAPE_APPEND BIT(8)
65 #define ESCAPE_ALL_MASK GENMASK(8, 0)
67 int string_escape_mem(const char *src, size_t isz, char *dst, size_t osz,
68 unsigned int flags, const char *only);
70 static inline int string_escape_mem_any_np(const char *src, size_t isz,
71 char *dst, size_t osz, const char *only)
73 return string_escape_mem(src, isz, dst, osz, ESCAPE_ANY_NP, only);
76 static inline int string_escape_str(const char *src, char *dst, size_t sz,
77 unsigned int flags, const char *only)
79 return string_escape_mem(src, strlen(src), dst, sz, flags, only);
82 static inline int string_escape_str_any_np(const char *src, char *dst,
83 size_t sz, const char *only)
85 return string_escape_str(src, dst, sz, ESCAPE_ANY_NP, only);
88 static inline void string_upper(char *dst, const char *src)
91 *dst++ = toupper(*src);
95 static inline void string_lower(char *dst, const char *src)
98 *dst++ = tolower(*src);
102 char *kstrdup_quotable(const char *src, gfp_t gfp);
103 char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp);
104 char *kstrdup_quotable_file(struct file *file, gfp_t gfp);
106 char **kasprintf_strarray(gfp_t gfp, const char *prefix, size_t n);
107 void kfree_strarray(char **array, size_t n);
109 char **devm_kasprintf_strarray(struct device *dev, const char *prefix, size_t n);
111 static inline const char *str_yes_no(bool v)
113 return v ? "yes" : "no";
116 static inline const char *str_on_off(bool v)
118 return v ? "on" : "off";
121 static inline const char *str_enable_disable(bool v)
123 return v ? "enable" : "disable";
126 static inline const char *str_enabled_disabled(bool v)
128 return v ? "enabled" : "disabled";
131 static inline const char *str_read_write(bool v)
133 return v ? "read" : "write";