Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_STRING_HELPERS_H_
3#define _LINUX_STRING_HELPERS_H_
4
5#include <linux/bits.h>
6#include <linux/ctype.h>
7#include <linux/string_choices.h>
8#include <linux/string.h>
9#include <linux/types.h>
10
11struct device;
12struct file;
13struct task_struct;
14
15static inline bool string_is_terminated(const char *s, int len)
16{
17 return memchr(s, '\0', len) ? true : false;
18}
19
20/* Descriptions of the types of units to
21 * print in */
22enum string_size_units {
23 STRING_UNITS_10, /* use powers of 10^3 (standard SI) */
24 STRING_UNITS_2, /* use binary powers of 2^10 */
25};
26
27int string_get_size(u64 size, u64 blk_size, enum string_size_units units,
28 char *buf, int len);
29
30int parse_int_array_user(const char __user *from, size_t count, int **array);
31
32#define UNESCAPE_SPACE BIT(0)
33#define UNESCAPE_OCTAL BIT(1)
34#define UNESCAPE_HEX BIT(2)
35#define UNESCAPE_SPECIAL BIT(3)
36#define UNESCAPE_ANY \
37 (UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_HEX | UNESCAPE_SPECIAL)
38
39#define UNESCAPE_ALL_MASK GENMASK(3, 0)
40
41int string_unescape(char *src, char *dst, size_t size, unsigned int flags);
42
43static inline int string_unescape_inplace(char *buf, unsigned int flags)
44{
45 return string_unescape(buf, buf, 0, flags);
46}
47
48static inline int string_unescape_any(char *src, char *dst, size_t size)
49{
50 return string_unescape(src, dst, size, UNESCAPE_ANY);
51}
52
53static inline int string_unescape_any_inplace(char *buf)
54{
55 return string_unescape_any(buf, buf, 0);
56}
57
58#define ESCAPE_SPACE BIT(0)
59#define ESCAPE_SPECIAL BIT(1)
60#define ESCAPE_NULL BIT(2)
61#define ESCAPE_OCTAL BIT(3)
62#define ESCAPE_ANY \
63 (ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_SPECIAL | ESCAPE_NULL)
64#define ESCAPE_NP BIT(4)
65#define ESCAPE_ANY_NP (ESCAPE_ANY | ESCAPE_NP)
66#define ESCAPE_HEX BIT(5)
67#define ESCAPE_NA BIT(6)
68#define ESCAPE_NAP BIT(7)
69#define ESCAPE_APPEND BIT(8)
70
71#define ESCAPE_ALL_MASK GENMASK(8, 0)
72
73int string_escape_mem(const char *src, size_t isz, char *dst, size_t osz,
74 unsigned int flags, const char *only);
75
76static inline int string_escape_mem_any_np(const char *src, size_t isz,
77 char *dst, size_t osz, const char *only)
78{
79 return string_escape_mem(src, isz, dst, osz, ESCAPE_ANY_NP, only);
80}
81
82static inline int string_escape_str(const char *src, char *dst, size_t sz,
83 unsigned int flags, const char *only)
84{
85 return string_escape_mem(src, strlen(src), dst, sz, flags, only);
86}
87
88static inline int string_escape_str_any_np(const char *src, char *dst,
89 size_t sz, const char *only)
90{
91 return string_escape_str(src, dst, sz, ESCAPE_ANY_NP, only);
92}
93
94static inline void string_upper(char *dst, const char *src)
95{
96 do {
97 *dst++ = toupper(*src);
98 } while (*src++);
99}
100
101static inline void string_lower(char *dst, const char *src)
102{
103 do {
104 *dst++ = tolower(*src);
105 } while (*src++);
106}
107
108char *kstrdup_quotable(const char *src, gfp_t gfp);
109char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp);
110char *kstrdup_quotable_file(struct file *file, gfp_t gfp);
111
112char *kstrdup_and_replace(const char *src, char old, char new, gfp_t gfp);
113
114char **kasprintf_strarray(gfp_t gfp, const char *prefix, size_t n);
115void kfree_strarray(char **array, size_t n);
116
117char **devm_kasprintf_strarray(struct device *dev, const char *prefix, size_t n);
118
119#endif