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/types.h>
   6
   7 struct file;
   8 struct task_struct;
   9
  10 /* Descriptions of the types of units to
  11  * print in */
  12 enum string_size_units {
  13         STRING_UNITS_10,        /* use powers of 10^3 (standard SI) */
  14         STRING_UNITS_2,         /* use binary powers of 2^10 */
  15 };
  16
  17 void string_get_size(u64 size, u64 blk_size, enum string_size_units units,
  18                      char *buf, int len);
  19
  20 #define UNESCAPE_SPACE          0x01
  21 #define UNESCAPE_OCTAL          0x02
  22 #define UNESCAPE_HEX            0x04
  23 #define UNESCAPE_SPECIAL        0x08
  24 #define UNESCAPE_ANY            \
  25         (UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_HEX | UNESCAPE_SPECIAL)
  26
  27 int string_unescape(char *src, char *dst, size_t size, unsigned int flags);
  28
  29 static inline int string_unescape_inplace(char *buf, unsigned int flags)
  30 {
  31         return string_unescape(buf, buf, 0, flags);
  32 }
  33
  34 static inline int string_unescape_any(char *src, char *dst, size_t size)
  35 {
  36         return string_unescape(src, dst, size, UNESCAPE_ANY);
  37 }
  38
  39 static inline int string_unescape_any_inplace(char *buf)
  40 {
  41         return string_unescape_any(buf, buf, 0);
  42 }
  43
  44 #define ESCAPE_SPACE            0x01
  45 #define ESCAPE_SPECIAL          0x02
  46 #define ESCAPE_NULL             0x04
  47 #define ESCAPE_OCTAL            0x08
  48 #define ESCAPE_ANY              \
  49         (ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_SPECIAL | ESCAPE_NULL)
  50 #define ESCAPE_NP               0x10
  51 #define ESCAPE_ANY_NP           (ESCAPE_ANY | ESCAPE_NP)
  52 #define ESCAPE_HEX              0x20
  53
  54 int string_escape_mem(const char *src, size_t isz, char *dst, size_t osz,
  55                 unsigned int flags, const char *only);
  56
  57 static inline int string_escape_mem_any_np(const char *src, size_t isz,
  58                 char *dst, size_t osz, const char *only)
  59 {
  60         return string_escape_mem(src, isz, dst, osz, ESCAPE_ANY_NP, only);
  61 }
  62
  63 static inline int string_escape_str(const char *src, char *dst, size_t sz,
  64                 unsigned int flags, const char *only)
  65 {
  66         return string_escape_mem(src, strlen(src), dst, sz, flags, only);
  67 }
  68
  69 static inline int string_escape_str_any_np(const char *src, char *dst,
  70                 size_t sz, const char *only)
  71 {
  72         return string_escape_str(src, dst, sz, ESCAPE_ANY_NP, only);
  73 }
  74
  75 char *kstrdup_quotable(const char *src, gfp_t gfp);
  76 char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp);
  77 char *kstrdup_quotable_file(struct file *file, gfp_t gfp);
  78
  79 #endif