strncpy - copy substring

Syntax

#include <string.h> char *strncpy(char *s1, const char *s2, size_t n);

Description strncpy() copies a maximum of n characters from string s2 to string s1.

	If string s2 contains less than n characters, only the length of s2 (strlen + 1) is copied, and s1 is then padded to the length of n with null bytes. If string s2 contains n or more characters (excluding the null byte), string s1 is not automatically terminated with the null byte. If string s1 contains more than n characters and the last character copied from s2 is not the null byte, any data which may still remain in s1 is retained. strncpy() does not automatically terminate s1 with the null byte.
Return val. Notes	Pointer to the result string s1. strncpy() does not verify whether s1 has enough space to accommodate the result! Since strncpy() does not automatically terminate the result string with the null byte, it may often be necessary to explicitly terminate s1 with a null byte. This is typically the case when only a part of s2 is being copied, and s2 does not contain a null byte either. The behavior is undefined if memory areas overlap.
See also	strcpy(), strlen(), string.h.