include/linux/string_helpers.h

   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
  11 struct device;
  12 struct file;
  13 struct task_struct;
  14
  15 static 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 print in */
  21 enum string_size_units {
  22         STRING_UNITS_10,        /* use powers of 10^3 (standard SI) */
  23         STRING_UNITS_2,         /* use binary powers of 2^10 */
  24         STRING_UNITS_MASK       = BIT(0),
  25
  26         /* Modifiers */
  27         STRING_UNITS_NO_SPACE   = BIT(30),
  28         STRING_UNITS_NO_BYTES   = BIT(31),
  29 };
  30
  31 int string_get_size(u64 size, u64 blk_size, const enum string_size_units units,
  32                     char *buf, int len);
  33
  34 int parse_int_array_user(const char __user *from, size_t count, int **array);
  35
  36 #define UNESCAPE_SPACE          BIT(0)
  37 #define UNESCAPE_OCTAL          BIT(1)
  38 #define UNESCAPE_HEX            BIT(2)
  39 #define UNESCAPE_SPECIAL        BIT(3)
  40 #define UNESCAPE_ANY            \
  41         (UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_HEX | UNESCAPE_SPECIAL)
  42
  43 #define UNESCAPE_ALL_MASK       GENMASK(3, 0)
  44
  45 int string_unescape(char *src, char *dst, size_t size, unsigned int flags);
  46
  47 static inline int string_unescape_inplace(char *buf, unsigned int flags)
  48 {
  49         return string_unescape(buf, buf, 0, flags);
  50 }
  51
  52 static inline int string_unescape_any(char *src, char *dst, size_t size)
  53 {
  54         return string_unescape(src, dst, size, UNESCAPE_ANY);
  55 }
  56
  57 static inline int string_unescape_any_inplace(char *buf)
  58 {
  59         return string_unescape_any(buf, buf, 0);
  60 }
  61
  62 #define ESCAPE_SPACE            BIT(0)
  63 #define ESCAPE_SPECIAL          BIT(1)
  64 #define ESCAPE_NULL             BIT(2)
  65 #define ESCAPE_OCTAL            BIT(3)
  66 #define ESCAPE_ANY              \
  67         (ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_SPECIAL | ESCAPE_NULL)
  68 #define ESCAPE_NP               BIT(4)
  69 #define ESCAPE_ANY_NP           (ESCAPE_ANY | ESCAPE_NP)
  70 #define ESCAPE_HEX              BIT(5)
  71 #define ESCAPE_NA               BIT(6)
  72 #define ESCAPE_NAP              BIT(7)
  73 #define ESCAPE_APPEND           BIT(8)
  74
  75 #define ESCAPE_ALL_MASK         GENMASK(8, 0)
  76
  77 int string_escape_mem(const char *src, size_t isz, char *dst, size_t osz,
  78                 unsigned int flags, const char *only);
  79
  80 static inline int string_escape_mem_any_np(const char *src, size_t isz,
  81                 char *dst, size_t osz, const char *only)
  82 {
  83         return string_escape_mem(src, isz, dst, osz, ESCAPE_ANY_NP, only);
  84 }
  85
  86 static inline int string_escape_str(const char *src, char *dst, size_t sz,
  87                 unsigned int flags, const char *only)
  88 {
  89         return string_escape_mem(src, strlen(src), dst, sz, flags, only);
  90 }
  91
  92 static inline int string_escape_str_any_np(const char *src, char *dst,
  93                 size_t sz, const char *only)
  94 {
  95         return string_escape_str(src, dst, sz, ESCAPE_ANY_NP, only);
  96 }
  97
  98 static inline void string_upper(char *dst, const char *src)
  99 {
 100         do {
 101                 *dst++ = toupper(*src);
 102         } while (*src++);
 103 }
 104
 105 static inline void string_lower(char *dst, const char *src)
 106 {
 107         do {
 108                 *dst++ = tolower(*src);
 109         } while (*src++);
 110 }
 111
 112 char *kstrdup_quotable(const char *src, gfp_t gfp);
 113 char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp);
 114 char *kstrdup_quotable_file(struct file *file, gfp_t gfp);
 115
 116 char *kstrdup_and_replace(const char *src, char old, char new, gfp_t gfp);
 117
 118 char **kasprintf_strarray(gfp_t gfp, const char *prefix, size_t n);
 119 void kfree_strarray(char **array, size_t n);
 120
 121 char **devm_kasprintf_strarray(struct device *dev, const char *prefix, size_t n);
 122
 123 #endif