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/ctype.h>
   6 #include <linux/types.h>
   7
   8 struct file;
   9 struct task_struct;
  10
  11 /* Descriptions of the types of units to
  12  * print in */
  13 enum string_size_units {
  14         STRING_UNITS_10,        /* use powers of 10^3 (standard SI) */
  15         STRING_UNITS_2,         /* use binary powers of 2^10 */
  16 };
  17
  18 void string_get_size(u64 size, u64 blk_size, enum string_size_units units,
  19                      char *buf, int len);
  20
  21 #define UNESCAPE_SPACE          0x01
  22 #define UNESCAPE_OCTAL          0x02
  23 #define UNESCAPE_HEX            0x04
  24 #define UNESCAPE_SPECIAL        0x08
  25 #define UNESCAPE_ANY            \
  26         (UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_HEX | UNESCAPE_SPECIAL)
  27
  28 int string_unescape(char *src, char *dst, size_t size, unsigned int flags);
  29
  30 static inline int string_unescape_inplace(char *buf, unsigned int flags)
  31 {
  32         return string_unescape(buf, buf, 0, flags);
  33 }
  34
  35 static inline int string_unescape_any(char *src, char *dst, size_t size)
  36 {
  37         return string_unescape(src, dst, size, UNESCAPE_ANY);
  38 }
  39
  40 static inline int string_unescape_any_inplace(char *buf)
  41 {
  42         return string_unescape_any(buf, buf, 0);
  43 }
  44
  45 #define ESCAPE_SPACE            0x01
  46 #define ESCAPE_SPECIAL          0x02
  47 #define ESCAPE_NULL             0x04
  48 #define ESCAPE_OCTAL            0x08
  49 #define ESCAPE_ANY              \
  50         (ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_SPECIAL | ESCAPE_NULL)
  51 #define ESCAPE_NP               0x10
  52 #define ESCAPE_ANY_NP           (ESCAPE_ANY | ESCAPE_NP)
  53 #define ESCAPE_HEX              0x20
  54
  55 int string_escape_mem(const char *src, size_t isz, char *dst, size_t osz,
  56                 unsigned int flags, const char *only);
  57
  58 int string_escape_mem_ascii(const char *src, size_t isz, char *dst,
  59                                         size_t osz);
  60
  61 static inline int string_escape_mem_any_np(const char *src, size_t isz,
  62                 char *dst, size_t osz, const char *only)
  63 {
  64         return string_escape_mem(src, isz, dst, osz, ESCAPE_ANY_NP, only);
  65 }
  66
  67 static inline int string_escape_str(const char *src, char *dst, size_t sz,
  68                 unsigned int flags, const char *only)
  69 {
  70         return string_escape_mem(src, strlen(src), dst, sz, flags, only);
  71 }
  72
  73 static inline int string_escape_str_any_np(const char *src, char *dst,
  74                 size_t sz, const char *only)
  75 {
  76         return string_escape_str(src, dst, sz, ESCAPE_ANY_NP, only);
  77 }
  78
  79 static inline void string_upper(char *dst, const char *src)
  80 {
  81         do {
  82                 *dst++ = toupper(*src);
  83         } while (*src++);
  84 }
  85
  86 static inline void string_lower(char *dst, const char *src)
  87 {
  88         do {
  89                 *dst++ = tolower(*src);
  90         } while (*src++);
  91 }
  92
  93 char *kstrdup_quotable(const char *src, gfp_t gfp);
  94 char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp);
  95 char *kstrdup_quotable_file(struct file *file, gfp_t gfp);
  96
  97 void kfree_strarray(char **array, size_t n);
  98
  99 #endif