C Language strcpy,memcpy,memmove,memccpy function

1. Prototype: extern char *strcpy (char *dest,char *src);

Usage: #include <string.h>

function: Copy the null-terminated string from SRC to the array referred to by Dest.

Description: The memory areas referred to by SRC and dest cannot overlap and dest must have sufficient space to accommodate the SRC string.

Returns a pointer to the dest.

2. Prototype: extern void *memcpy (void *dest, void *src, unsigned int count);

Usage: #include <string.h>

Function: the memory area referred to by SRC is copied from count bytes to the memory area of Dest.

Description: The memory area referred to by SRC and dest cannot overlap, and the function returns a pointer to Dest.

3. Prototype: extern void *memmove (void *dest, const void *SRC, unsigned int count);

Usage: #include <string.h>

Function: the memory area referred to by SRC is copied from count bytes to the memory area of Dest.

Description: The memory areas referred to by SRC and dest can overlap, but the SRC content will be changed after copying. function returns a pointer to Dest

4. Prototype: extern void *memccpy (void *dest, void *src, unsigned char ch, unsigned int count);

Usage: #include <string.h>

Function: the memory area referred to by SRC is not more than count bytes to the memory area referred to by dest, and if the character ch is encountered, it stops copying.

Description: Returns a pointer to the first character after the character CH, or null if no ch is present in the first n bytes of SRC. CH is copied.

Note: Memory overlap issues.

C Language strcpy,memcpy,memmove,memccpy function