lv_string.h

Functions

void *lv_memcpy(void *dst, const void *src, size_t len)

Copies a block of memory from a source address to a destination address.

Note

The function does not check for any overlapping of the source and destination memory blocks.

Parameters:

dst -- Pointer to the destination array where the content is to be copied.
src -- Pointer to the source of data to be copied.
len -- Number of bytes to copy.

Returns:

Pointer to the destination array.

void lv_memset(void *dst, uint8_t v, size_t len)

Fills a block of memory with a specified value.

Parameters:

dst -- Pointer to the destination array to fill with the specified value.
v -- Value to be set. The value is passed as an int, but the function fills the block of memory using the unsigned char conversion of this value.
len -- Number of bytes to be set to the value.

void *lv_memmove(void *dst, const void *src, size_t len)

Move a block of memory from source to destination.

Parameters:

dst -- Pointer to the destination array where the content is to be copied.
src -- Pointer to the source of data to be copied.
len -- Number of bytes to copy

Returns:

Pointer to the destination array.

int32_t lv_memcmp(const void *p1, const void *p2, size_t len)

This function will compare two memory blocks.

Parameters:

p1 -- Pointer to the first memory block
p2 -- Pointer to the second memory block
len -- Number of bytes to compare

Returns:

The difference between the value of the first unmatching byte.

static inline void lv_memzero(void *dst, size_t len)

Same as memset(dst, 0x00, len).

Parameters:

dst -- pointer to the destination buffer
len -- number of byte to set

size_t lv_strlen(const char *str)

Computes the length of the string str up to, but not including the terminating null character.

Parameters:: str -- Pointer to the null-terminated byte string to be examined.
Returns:: The length of the string in bytes.

char *lv_strncpy(char *dst, const char *src, size_t dest_size)

Copies up to dest_size characters from the string pointed to by src to the character array pointed to by dst.

Parameters:

dst -- Pointer to the destination array where the content is to be copied.
src -- Pointer to the source of data to be copied.
dest_size -- Maximum number of characters to be copied to dst, including the null character.

Returns:

A pointer to the destination array, which is dst.

char *lv_strcpy(char *dst, const char *src)

Copies the string pointed to by src, including the terminating null character, to the character array pointed to by dst.

Parameters:

dst -- Pointer to the destination array where the content is to be copied.
src -- Pointer to the source of data to be copied.

Returns:

A pointer to the destination array, which is dst.

int32_t lv_strcmp(const char *s1, const char *s2)

This function will compare two strings without specified length.

Parameters:

s1 -- pointer to the first string
s2 -- pointer to the second string

Returns:

the difference between the value of the first unmatching character.

char *lv_strdup(const char *src)

Duplicate a string by allocating a new one and copying the content.

Parameters:: src -- Pointer to the source of data to be copied.
Returns:: A pointer to the new allocated string. NULL if failed.

char *lv_strcat(char *dst, const char *src)

Copies the string pointed to by src, including the terminating null character, to the end of the string pointed to by dst.

Parameters:

dst -- Pointer to the destination string where the content is to be appended.
src -- Pointer to the source of data to be copied.

Returns:

A pointer to the destination string, which is dst.

char *lv_strncat(char *dst, const char *src, size_t src_len)

Copies up to src_len characters from the string pointed to by src to the end of the string pointed to by dst. A terminating null character is appended to dst even if no null character was encountered in src after src_len characters were copied.

Parameters:

dst -- Pointer to the destination string where the content is to be appended.
src -- Pointer to the source of data to be copied.
src_len -- Maximum number of characters from src to be copied to the end of dst.

Returns:

A pointer to the destination string, which is dst.