Other useful kernel service

Defines
#define	rt_list_entry(node, type, member)   ((type *)((char *)(node) - (unsigned long)(&((type *)0)->member)))
Functions
int *	_rt_errno (void)
void *	rt_memset (void *s, int c, rt_ubase_t count)
void *	rt_memcpy (void *dst, const void *src, rt_ubase_t count)
void *	rt_memmove (void *dest, const void *src, rt_ubase_t n)
rt_int32_t	rt_memcmp (const void *cs, const void *ct, rt_ubase_t count)
char *	rt_strstr (const char *s1, const char *s2)
rt_uint32_t	rt_strcasecmp (const char *a, const char *b)
char *	rt_strncpy (char *dst, const char *src, rt_ubase_t n)
rt_ubase_t	rt_strncmp (const char *cs, const char *ct, rt_ubase_t count)
rt_ubase_t	rt_strcmp (const char *cs, const char *ct)
rt_ubase_t	rt_strlen (const char *s)
char *	rt_strdup (const char *s)
void	rt_show_version (void)
rt_int32_t	rt_snprintf (char *buf, rt_size_t size, const char *fmt,...)
rt_int32_t	rt_vsprintf (char *buf, const char *format, va_list arg_ptr)
rt_int32_t	rt_sprintf (char *buf, const char *format,...)
rt_inline void	rt_list_init (rt_list_t *l)
rt_inline void	rt_list_insert_after (rt_list_t *l, rt_list_t *n)
rt_inline void	rt_list_insert_before (rt_list_t *l, rt_list_t *n)
rt_inline void	rt_list_remove (rt_list_t *n)
rt_inline int	rt_list_isempty (const rt_list_t *l)

---

Define Documentation

#define rt_list_entry	(		node,
			type,
			member
	)		((type *)((char *)(node) - (unsigned long)(&((type *)0)->member)))

get the struct for this entry

Parameters:

node	the entry point
type	the type of structure
member	the name of list in structure

---

Function Documentation

int * _rt_errno

(

void

)

This function returns errno.

Returns:

the errno in the system

void * rt_memset	(	void *	s,
		int	c,
		rt_ubase_t	count
	)

This function will set the content of memory to specified value

Parameters:

s	the address of source memory
c	the value shall be set in content
count	the copied length

Returns:

the address of source memory

void * rt_memcpy	(	void *	dst,
		const void *	src,
		rt_ubase_t	count
	)

This function will copy memory content from source address to destination address.

Parameters:

dst	the address of destination memory
src	the address of source memory
count	the copied length

Returns:

the address of destination memory

void * rt_memmove	(	void *	dest,
		const void *	src,
		rt_ubase_t	n
	)

This function will move memory content from source address to destination address.

Parameters:

dest	the address of destination memory
src	the address of source memory
n	the copied length

Returns:

the address of destination memory

rt_int32_t rt_memcmp	(	const void *	cs,
		const void *	ct,
		rt_ubase_t	count
	)

This function will compare two areas of memory

Parameters:

cs	one area of memory
ct	znother area of memory
count	the size of the area

Returns:

the result

char * rt_strstr	(	const char *	s1,
		const char *	s2
	)

This function will return the first occurrence of a string.

Parameters:

s1	the source string
s2	the find string

Returns:

the first occurrence of a s2 in s1, or RT_NULL if no found.

rt_uint32_t rt_strcasecmp	(	const char *	a,
		const char *	b
	)

This function will compare two strings while ignoring differences in case

Parameters:

a	the string to be compared
b	the string to be compared

Returns:

the result

char * rt_strncpy	(	char *	dst,
		const char *	src,
		rt_ubase_t	n
	)

This function will copy string no more than n bytes.

Parameters:

dst	the string to copy
src	the string to be copied
n	the maximum copied length

Returns:

the result

rt_ubase_t rt_strncmp	(	const char *	cs,
		const char *	ct,
		rt_ubase_t	count
	)

This function will compare two strings with specified maximum length

Parameters:

cs	the string to be compared
ct	the string to be compared
count	the maximum compare length

Returns:

the result

rt_ubase_t rt_strcmp	(	const char *	cs,
		const char *	ct
	)

This function will compare two strings without specified length

Parameters:

cs	the string to be compared
ct	the string to be compared

Returns:

the result

rt_ubase_t rt_strlen

(

const char *

s

)

This function will return the length of a string, which terminate will null character.

Parameters:

s	the string

Returns:

the length of string

char * rt_strdup

(

const char *

s

)

This function will duplicate a string.

Parameters:

s	the string to be duplicated

Returns:

the duplicated string pointer

void rt_show_version

(

void

)

This function will show the version of rt-thread rtos

rt_int32_t rt_snprintf	(	char *	buf,
		rt_size_t	size,
		const char *	fmt,
			...
	)

This function will fill a formatted string to buffer

Parameters:

buf	the buffer to save formatted string
size	the size of buffer
fmt	the format

rt_int32_t rt_vsprintf	(	char *	buf,
		const char *	format,
		va_list	arg_ptr
	)

This function will fill a formatted string to buffer

Parameters:

buf	the buffer to save formatted string
arg_ptr	the arg_ptr
format	the format

rt_int32_t rt_sprintf	(	char *	buf,
		const char *	format,
			...
	)

This function will fill a formatted string to buffer

Parameters:

buf	the buffer to save formatted string
format	the format

rt_inline void rt_list_init

(

rt_list_t *

l

)

initialize a list

Parameters:

l	list to be initialized

rt_inline void rt_list_insert_after	(	rt_list_t *	l,
		rt_list_t *	n
	)

insert a node after a list

Parameters:

l	list to insert it
n	new node to be inserted

rt_inline void rt_list_insert_before	(	rt_list_t *	l,
		rt_list_t *	n
	)

insert a node before a list

Parameters:

n	new node to be inserted
l	list to insert it

rt_inline void rt_list_remove

(

rt_list_t *

n

)

remove node from list.

Parameters:

n	the node to remove from the list.

rt_inline int rt_list_isempty

(

const rt_list_t *

l

)

tests whether a list is empty

Parameters:

l	the list to test.