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.
- Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/bits.hlinux/ctype.hlinux/string_choices.hlinux/string.hlinux/types.h
Detected Declarations
struct devicestruct filestruct task_structenum string_size_unitsfunction string_is_terminatedfunction string_unescape_inplacefunction string_unescape_anyfunction string_unescape_any_inplacefunction string_escape_mem_any_npfunction string_escape_strfunction string_escape_str_any_npfunction string_upperfunction string_lower
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
- Immediate include surface: `linux/bits.h`, `linux/ctype.h`, `linux/string_choices.h`, `linux/string.h`, `linux/types.h`.
- Detected declarations: `struct device`, `struct file`, `struct task_struct`, `enum string_size_units`, `function string_is_terminated`, `function string_unescape_inplace`, `function string_unescape_any`, `function string_unescape_any_inplace`, `function string_escape_mem_any_np`, `function string_escape_str`.
- Atlas domain: Core OS / Core Kernel Interface.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.