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