include/linux/string_helpers.h

Source file repositories/reference/linux-study-clean/include/linux/string_helpers.h

File Facts

System
Linux kernel
Corpus path
include/linux/string_helpers.h
Extension
.h
Size
3434 bytes
Lines
125
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _LINUX_STRING_HELPERS_H_
#define _LINUX_STRING_HELPERS_H_

#include <linux/bits.h>
#include <linux/ctype.h>
#include <linux/string_choices.h>
#include <linux/string.h>
#include <linux/types.h>

struct device;
struct file;
struct task_struct;

static inline bool string_is_terminated(const char *s, int len)
{
	return memchr(s, '\0', len) ? true : false;
}

/* 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 */
	STRING_UNITS_MASK	= BIT(0),

	/* Modifiers */
	STRING_UNITS_NO_SPACE	= BIT(30),
	STRING_UNITS_NO_BYTES	= BIT(31),
};

int string_get_size(u64 size, u64 blk_size, const enum string_size_units units,
		    char *buf, int len);

int parse_int_array(const char *buf, size_t count, int **array);
int parse_int_array_user(const char __user *from, size_t count, int **array);

#define UNESCAPE_SPACE		BIT(0)
#define UNESCAPE_OCTAL		BIT(1)
#define UNESCAPE_HEX		BIT(2)
#define UNESCAPE_SPECIAL	BIT(3)
#define UNESCAPE_ANY		\
	(UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_HEX | UNESCAPE_SPECIAL)

#define UNESCAPE_ALL_MASK	GENMASK(3, 0)

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);
}

#define ESCAPE_SPACE		BIT(0)
#define ESCAPE_SPECIAL		BIT(1)
#define ESCAPE_NULL		BIT(2)
#define ESCAPE_OCTAL		BIT(3)
#define ESCAPE_ANY		\
	(ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_SPECIAL | ESCAPE_NULL)
#define ESCAPE_NP		BIT(4)
#define ESCAPE_ANY_NP		(ESCAPE_ANY | ESCAPE_NP)
#define ESCAPE_HEX		BIT(5)
#define ESCAPE_NA		BIT(6)
#define ESCAPE_NAP		BIT(7)
#define ESCAPE_APPEND		BIT(8)

#define ESCAPE_ALL_MASK		GENMASK(8, 0)

int string_escape_mem(const char *src, size_t isz, char *dst, size_t osz,
		unsigned int flags, const char *only);

static inline int string_escape_mem_any_np(const char *src, size_t isz,
		char *dst, size_t osz, const char *only)
{
	return string_escape_mem(src, isz, dst, osz, ESCAPE_ANY_NP, only);
}

static inline int string_escape_str(const char *src, char *dst, size_t sz,
		unsigned int flags, const char *only)
{
	return string_escape_mem(src, strlen(src), dst, sz, flags, only);
}

Annotation

Implementation Notes