mirror of https://gitee.com/openkylin/linux.git
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
#ifndef _LINUX_STRING_HELPERS_H_
|
|
#define _LINUX_STRING_HELPERS_H_
|
|
|
|
#include <linux/types.h>
|
|
|
|
/* Descriptions of the types of units to
|
|
* print in */
|
|
enum string_size_units {
|
|
STRING_UNITS_10, /* use powers of 10^3 (standard SI) */
|
|
STRING_UNITS_2, /* use binary powers of 2^10 */
|
|
};
|
|
|
|
int string_get_size(u64 size, enum string_size_units units,
|
|
char *buf, int len);
|
|
|
|
#define UNESCAPE_SPACE 0x01
|
|
#define UNESCAPE_OCTAL 0x02
|
|
#define UNESCAPE_HEX 0x04
|
|
#define UNESCAPE_SPECIAL 0x08
|
|
#define UNESCAPE_ANY \
|
|
(UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_HEX | UNESCAPE_SPECIAL)
|
|
|
|
/**
|
|
* string_unescape - unquote characters in the given string
|
|
* @src: source buffer (escaped)
|
|
* @dst: destination buffer (unescaped)
|
|
* @size: size of the destination buffer (0 to unlimit)
|
|
* @flags: combination of the flags (bitwise OR):
|
|
* %UNESCAPE_SPACE:
|
|
* '\f' - form feed
|
|
* '\n' - new line
|
|
* '\r' - carriage return
|
|
* '\t' - horizontal tab
|
|
* '\v' - vertical tab
|
|
* %UNESCAPE_OCTAL:
|
|
* '\NNN' - byte with octal value NNN (1 to 3 digits)
|
|
* %UNESCAPE_HEX:
|
|
* '\xHH' - byte with hexadecimal value HH (1 to 2 digits)
|
|
* %UNESCAPE_SPECIAL:
|
|
* '\"' - double quote
|
|
* '\\' - backslash
|
|
* '\a' - alert (BEL)
|
|
* '\e' - escape
|
|
* %UNESCAPE_ANY:
|
|
* all previous together
|
|
*
|
|
* Returns amount of characters processed to the destination buffer excluding
|
|
* trailing '\0'.
|
|
*
|
|
* Because the size of the output will be the same as or less than the size of
|
|
* the input, the transformation may be performed in place.
|
|
*
|
|
* Caller must provide valid source and destination pointers. Be aware that
|
|
* destination buffer will always be NULL-terminated. Source string must be
|
|
* NULL-terminated as well.
|
|
*/
|
|
int string_unescape(char *src, char *dst, size_t size, unsigned int flags);
|
|
|
|
static inline int string_unescape_inplace(char *buf, unsigned int flags)
|
|
{
|
|
return string_unescape(buf, buf, 0, flags);
|
|
}
|
|
|
|
static inline int string_unescape_any(char *src, char *dst, size_t size)
|
|
{
|
|
return string_unescape(src, dst, size, UNESCAPE_ANY);
|
|
}
|
|
|
|
static inline int string_unescape_any_inplace(char *buf)
|
|
{
|
|
return string_unescape_any(buf, buf, 0);
|
|
}
|
|
|
|
#endif
|